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Zhao H, Guo Y, Wang X, Sun H, Gao M, Wu C, Li S, Li YY, Wang Q. Exploring the maximum nitrite production rate through the granular sludge-type reactor to match the needs of anammox process realizing efficient nitrogen removal. ENVIRONMENTAL RESEARCH 2024; 255:119158. [PMID: 38763279 DOI: 10.1016/j.envres.2024.119158] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/11/2024] [Revised: 05/13/2024] [Accepted: 05/14/2024] [Indexed: 05/21/2024]
Abstract
The reliable and efficient nitrite production rate (NPR) through nitritation process is the prerequisite for the efficient running of subsequent processes, like the anammox process and the nitrite shunt. However, there has been scant research on stable and productive nitritation process in recent years. In this study, at a stable hydraulic retention time of 12.0 h and with precise and strict DO control, the upper limit of the NPR was initially investigated using a continuous-flow granular sludge reactor. The NPR of 1.69 kg/m3/d with a nitrite production efficiency of 81.97% was finally achieved, which set a record until now in similar research. The median sludge particle size of 270.0 μm confirmed the development of clearly defined granular sludge. The genus Nitrosomonas was the major ammonium oxidizing bacteria. In conclusion, this study provides valuable insights for the practical application of the effective nitritation process driving subsequent nitrogen removal processes.
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Affiliation(s)
- Hongjun Zhao
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Yan Guo
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China; Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, Beijing, 100083, China.
| | - Xiaona Wang
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China; Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, Beijing, 100083, China
| | - Haishu Sun
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China; Shunde Innovation School, University of Science and Technology Beijing, Foshan, 528399, China
| | - Ming Gao
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China; Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, Beijing, 100083, China
| | - Chuanfu Wu
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China; Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, Beijing, 100083, China
| | - Shuang Li
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China
| | - Yu-You Li
- Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi, 980-8579, Japan
| | - Qunhui Wang
- School of Energy and Environmental Engineering, University of Science and Technology Beijing, Beijing, 100083, China; Beijing Key Laboratory of Resource-Oriented Treatment of Industrial Pollutants, Beijing, 100083, China
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Li Y, Wu X, Liu Y, Taidi B. Immobilized microalgae: principles, processes and its applications in wastewater treatment. World J Microbiol Biotechnol 2024; 40:150. [PMID: 38548998 DOI: 10.1007/s11274-024-03930-2] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/25/2023] [Accepted: 02/16/2024] [Indexed: 04/02/2024]
Abstract
Microalgae have emerged as potential candidates for biomass production and pollutant removal. However, expensive biomass harvesting, insufficient biomass productivity, and low energy intensity limit the large-scale production of microalgae. To break through these bottlenecks, a novel technology of immobilized microalgae culture coupled with wastewater treatment has received increasing attention in recent years. In this review, the characteristics of two immobilized microalgae culture technologies are first presented and then their mechanisms are discussed in terms of biofilm formation theories, including thermodynamic theory, Derjaguin-Landau-Verwei-Overbeek theory (DLVO) and its extended theory (xDLVO), as well as ionic cross-linking mechanisms in the process of microalgae encapsulated in alginate. The main factors (algal strains, carriers, and culture conditions) affecting the growth of microalgae are also discussed. It is also summarized that immobilized microalgae show considerable potential for nitrogen and phosphorus removal, heavy metal removal, pesticide and antibiotic removal in wastewater treatment. The role of bacteria in the cultivation of microalgae by immobilization techniques and their application in wastewater treatment are clarified. This is economically feasible and technically superior. The problems and challenges faced by immobilized microalgae are finally presented.
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Affiliation(s)
- Yanpeng Li
- School of Water and Environment, Chang`an University, Yanta Road #126, Yanta District, Xi`an, 710054, People's Republic of China.
- Key Laboratory of Subsurface Hydrology and Ecological Effects in Arid Region, Ministry of Education, Chang`an University, Xi`an, 710054, People's Republic of China.
| | - Xuexue Wu
- School of Water and Environment, Chang`an University, Yanta Road #126, Yanta District, Xi`an, 710054, People's Republic of China
| | - Yi Liu
- School of Water and Environment, Chang`an University, Yanta Road #126, Yanta District, Xi`an, 710054, People's Republic of China
| | - Behnam Taidi
- LGPM, CentraleSupélec, Université Paris Saclay, 3 rue Joliot-Curie, 91190, Gif-sur-Yvette, France
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3
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Gomeiz AT, Sun Y, Newborn A, Wang ZW, Angelotti B, Van Aken B. Metagenomic Analysis of a Continuous-Flow Aerobic Granulation System for Wastewater Treatment. Microorganisms 2023; 11:2328. [PMID: 37764172 PMCID: PMC10535324 DOI: 10.3390/microorganisms11092328] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/30/2023] [Revised: 09/07/2023] [Accepted: 09/13/2023] [Indexed: 09/29/2023] Open
Abstract
Aerobic granulation is an emerging process in wastewater treatment that has the potential to accelerate sedimentation of the microbial biomass during secondary treatment. Aerobic granulation has been difficult to achieve in the continuous flow reactors (CFRs) used in modern wastewater treatment plants. Recent research has demonstrated that the alternation of nutrient-abundant (feast) and nutrient-limiting (famine) conditions is able to promote aerobic granulation in a CFR. In this study, we conducted a metagenomic analysis with the objective of characterizing the bacterial composition of the granular biomass developed in three simulated plug flow reactors (PFRs) with different feast-to-famine ratios. Phylogenetic analyses revealed a clear distinction between the bacterial composition of aerobic granules in the pilot simulated PFRs as compared with conventional activated sludge. Larger and denser granules, showing improved sedimentation properties, were observed in the PFR with the longest famine time and were characterized by a greater proportion of bacteria producing abundant extracellular polymeric substances (EPS). Functional metagenomic analysis based on KEGG pathways indicated that the large and dense aerobic granules in the PFR with the longest famine time showed increased functionalities related to secretion systems and quorum sensing, which are characteristics of bacteria in biofilms and aerobic granules. This study contributes to a further understanding of the relationship between aerobic granule morphology and the bacterial composition of the granular biomass.
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Affiliation(s)
- Alison T. Gomeiz
- School of Systems Biology, George Mason University, 10900 University Blvd, Manassas, VA 20110, USA;
| | - Yewei Sun
- Hazen and Sawyer, 4035 Ridge Top Road, Fairfax, VA 22030, USA;
| | - Aaron Newborn
- Department of Chemistry and Biochemistry, George Mason University, 4400 University Dr, Fairfax, VA 22030, USA;
| | - Zhi-Wu Wang
- Department of Biological Systems Engineering, Virginia Tech, 1230 Washington St. SW, Blacksburg, VA 24061, USA;
| | - Bob Angelotti
- Upper Occoquan Service Authority, 14631 Compton Rd, Centreville, VA 20121, USA;
| | - Benoit Van Aken
- Department of Chemistry and Biochemistry, George Mason University, 4400 University Dr, Fairfax, VA 22030, USA;
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4
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Wang Y, Wang H, Chen H. Response of aerobic activated sludge to edible oil exposure: Extracellular polymeric substance (EPS) characteristics and microbial community. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 335:117571. [PMID: 36871358 DOI: 10.1016/j.jenvman.2023.117571] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/18/2022] [Revised: 02/13/2023] [Accepted: 02/21/2023] [Indexed: 06/18/2023]
Abstract
Aerobic activated sludge is widely used to degrade edible oil wastewater in wastewater treatment plants. During this process, the observed poor organics removal performance might be caused by poor sludge settling performance, which might be influenced by extracellular polymeric substances (EPS) and the structure of the microbial community. However, this hypothesis was not confirmed. Thus, this study investigated the response of activated sludge to 50% and 100% edible oil exposure in comparison to glucose, focusing on organics removal performance, characteristics of sludge, EPS, and microbial community structure. Results showed that both concentrations of edible oil influenced the systems' performance, although 100% edible oil showed more significant negative effects than 50% edible oil. The mechanisms behind the influence of edible oil on the aerobic activated sludge system and the differences between the different concentrations of edible oil were revealed. The worse system performance in the edible oil exposure system was due to the worse sludge settling performance, which was significantly affected by edible oil (p < 0.05). The sludge settling performance was mainly inhibited by promoting the formation of floating particles and the enrichment of filamentous bacteria in the 50% edible oil exposure system; biosurfactant secretion was also speculated as the reason, in addition to the above factors, in the 100% edible oil exposure system. The macroscopic largest floating particles, highest total relative abundance of foaming bacteria and biosurfactant production genera (34.32%), lowest surface tension (43.7 mN/m), and highest emulsifying activity (E24 = 25%) of EPS in 100% edible oil exposure systems provide strong evidence.
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Affiliation(s)
- Yanqiong Wang
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China
| | - Hongwu Wang
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; Key Laboratory of Urban Water Supply, Water Saving and Water Environment Governance in the Yangtze River Delta of Ministry of Water Resources, Shanghai, 200092, China.
| | - Hongbin Chen
- College of Environmental Science and Engineering, Tongji University, Shanghai, 200092, China; National Engineering Research Center for Urban Pollution Control, Tongji University, Shanghai, 200092, China
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Tirkey V, Goonesekera EM, Kovalovszki A, Smets BF, Dechesne A, Valverde-Pérez B. Short sludge age denitrification as alternative process for energy and nutrient recovery. BIORESOURCE TECHNOLOGY 2022; 366:128184. [PMID: 36283659 DOI: 10.1016/j.biortech.2022.128184] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2022] [Revised: 10/17/2022] [Accepted: 10/18/2022] [Indexed: 06/16/2023]
Abstract
High rate activated sludge (HRAS) systems redirect organics into highly biodegradable sludge and nutrients into microbial proteins. This study evaluates anoxic HRAS for nitrogen and carbon recovery. The reactor treated synthetic wastewater at solids retention times (SRTs) of 5, 3 and 1 days. Denitrification rates varied between 0.15 and 0.19 g-NO3-N g-TSS-1 d-1 (total suspended solids per day) and all conditions showed favourable settling. The highest sludge yield, obtained at SRT 1 d, was 0.75 g-TSS g-CODremoved-1, double that observed for aerobic HRAS. The highest methane yield (322 mL-CH4 g-VSsludge-1) was obtained from sludge wasted at 3 d SRT. Both 1 d and 3 d SRTs showed favourable energy recovery, with 14 % of the organics recovered as methane. All conditions yielded sludge with protein content ranging between 24 and 27 % of dry weight and similar amino acid profile, comparable to traditional proteins. Thus, denitrifying HRAS recovers resources as its aerobic counterpart, allowing for nitrogen removal via denitrification, more stable compared to mainstream partial nitritation anammox typically combined with aerobic HRAS.
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Affiliation(s)
- Vishal Tirkey
- Department of Environmental and Resource Engineering, Technical University of Denmark, DTU, Building 115, Bygningstorvet, 2800 Lyngby, Denmark
| | - Estelle M Goonesekera
- Department of Environmental and Resource Engineering, Technical University of Denmark, DTU, Building 115, Bygningstorvet, 2800 Lyngby, Denmark
| | - Adam Kovalovszki
- Department of Environmental and Resource Engineering, Technical University of Denmark, DTU, Building 115, Bygningstorvet, 2800 Lyngby, Denmark
| | - Barth F Smets
- Department of Environmental and Resource Engineering, Technical University of Denmark, DTU, Building 115, Bygningstorvet, 2800 Lyngby, Denmark
| | - Arnaud Dechesne
- Department of Environmental and Resource Engineering, Technical University of Denmark, DTU, Building 115, Bygningstorvet, 2800 Lyngby, Denmark
| | - Borja Valverde-Pérez
- Department of Environmental and Resource Engineering, Technical University of Denmark, DTU, Building 115, Bygningstorvet, 2800 Lyngby, Denmark.
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6
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Song T, Zhang X, Li J. Aerobic granular sludge with filamentous bacteria immobilized by string carriers to treat simulated municipal wastewater in a continuous flow reactor. BIORESOURCE TECHNOLOGY 2022; 363:127917. [PMID: 36089129 DOI: 10.1016/j.biortech.2022.127917] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/12/2022] [Revised: 08/30/2022] [Accepted: 09/04/2022] [Indexed: 06/15/2023]
Abstract
Aerobic granular sludge with filamentous bacteria (FAGS) has displayed many desirable properties. However, the selective pressure based on settling speed cannot effectively separate FAGS from water in sequencing batch reactor (SBR), which limits FAGS development. In this study, a new selection pressure was created by adding string carriers. Strings were used as crystal nuclei to form immobilized FAGS to achieve rapid separation from water. The immobilization of FAGS was achieved in both SBR and continuous flow reactor (CFR). The immobilization and long-term operation of FAGS in CFR were explored. NH4+ and COD removal efficiency remained above 90 % and 85 %, respectively. Sphaerotilus, denitrifying microorganisms and EPS-secreting microorganisms were the main microorganisms in the immobilized FAGS. The selection pressure provided by the strings, the operating characteristics of the CFR, and the properties of Sphaerotilus may play key role in the immobilization of FAGS.
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Affiliation(s)
- Tao Song
- School of Civil and Environmental Engineering, Shenzhen Key Laboratory of Water Resource Application and Environmental Pollution Control, Harbin Institute of Technology, Shenzhen, Shenzhen, Guangdong 518055, PR China
| | - Xiaolei Zhang
- School of Civil and Environmental Engineering, Shenzhen Key Laboratory of Water Resource Application and Environmental Pollution Control, Harbin Institute of Technology, Shenzhen, Shenzhen, Guangdong 518055, PR China
| | - Ji Li
- School of Civil and Environmental Engineering, Shenzhen Key Laboratory of Water Resource Application and Environmental Pollution Control, Harbin Institute of Technology, Shenzhen, Shenzhen, Guangdong 518055, PR China; Shenzhen Key Laboratory of Water Resource Utilization and Environmental Pollution Control, Shenzhen 518055, PR China; State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, PR China.
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7
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Chen Y, Cao X, Chen Q, Ye X, Zeng Q, Yuan Y, Dong L, Huang F, Su D. Hydrogel With the Network Structure Fabricated by Anthocyanin‐Gelatin Crosslinking and Improved Mineral Encapsulation Ability. Int J Food Sci Technol 2022. [DOI: 10.1111/ijfs.16057] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Yun Chen
- School of Chemistry and Chemical Engineering Guangzhou University Guangzhou Guangdong 510006 China
| | - Xuejiao Cao
- School of Chemistry and Chemical Engineering Guangzhou University Guangzhou Guangdong 510006 China
| | - Qiqi Chen
- School of Chemistry and Chemical Engineering Guangzhou University Guangzhou Guangdong 510006 China
| | - Xueying Ye
- School of Chemistry and Chemical Engineering Guangzhou University Guangzhou Guangdong 510006 China
| | - Qingzhu Zeng
- School of Chemistry and Chemical Engineering Guangzhou University Guangzhou Guangdong 510006 China
| | - Yang Yuan
- School of Chemistry and Chemical Engineering Guangzhou University Guangzhou Guangdong 510006 China
| | - Lihong Dong
- Sericultural & Agri‐Food Research Institute Guangdong Academy of Agricultural Sciences / Key Laboratory of Functional Foods, Ministry of Agriculture and Rural Affairs / Guangdong Key Laboratory of Agricultural Products Processing Guangzhou 510610 China
| | - Fei Huang
- Sericultural & Agri‐Food Research Institute Guangdong Academy of Agricultural Sciences / Key Laboratory of Functional Foods, Ministry of Agriculture and Rural Affairs / Guangdong Key Laboratory of Agricultural Products Processing Guangzhou 510610 China
| | - Dongxiao Su
- School of Chemistry and Chemical Engineering Guangzhou University Guangzhou Guangdong 510006 China
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8
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Initialization, enhancement and mechanisms of aerobic granulation in wastewater treatment. Sep Purif Technol 2021. [DOI: 10.1016/j.seppur.2020.118220] [Citation(s) in RCA: 6] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/30/2022]
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9
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Wang L, Addy M, Cobb K, Ma H, Zhang R, Chen D, Chen P, Wang H, Liu Y, Ruan R. Interaction of Chlorella vulgaris and bacteria when co-cultivated in anaerobically digested swine manure. BIORESOURCE TECHNOLOGY 2021; 320:124250. [PMID: 33120056 DOI: 10.1016/j.biortech.2020.124250] [Citation(s) in RCA: 9] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2020] [Revised: 10/06/2020] [Accepted: 10/08/2020] [Indexed: 06/11/2023]
Abstract
Mono-culture and co-culture of algae (Chlorella vulgaris) and bacteria (activated sludge) on anaerobically digested swine manure (ADSM) were investigated in this research. The results showed that during the co-cultivation biomass growth was promoted (2.43 ± 0.11 g/L) compared with the algae-only culture (1.09 ± 0.03 g/L), and the aerobic bacteria growth was initially promoted, then inhibited. The SEM (Scanning Electron Microscope) observation indicated that the amount of the C. vulgaris increased while bacteria 'disappeared' over time. After 30 min settlement, 95.5% of the biomass in co-cultivation group precipitated, while only 40.4% of the biomass settled for the algae-only group was. It is believed that the presence of bacteria enhanced the settling rate through the formation of algal consortium flocs. Bacterial community diversity and composition were measured and the results indicated that the bacterial diversity dropped and the bacterial active classes changed in the co-cultivation group.
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Affiliation(s)
- Lu Wang
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, National Engineering Laboratory for High-concentration Refractory Organic Wastewater Treatment Technologies (NELHROWTT), East China University of Science and Technology, Shanghai 200237, China; Center for Biorefining and Department of Bioproducts and Biosystems Engineering, University of Minnesota, St. Paul, MN 55108, USA
| | - Min Addy
- Center for Biorefining and Department of Bioproducts and Biosystems Engineering, University of Minnesota, St. Paul, MN 55108, USA
| | - Kirk Cobb
- Center for Biorefining and Department of Bioproducts and Biosystems Engineering, University of Minnesota, St. Paul, MN 55108, USA
| | - Hongpeng Ma
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, National Engineering Laboratory for High-concentration Refractory Organic Wastewater Treatment Technologies (NELHROWTT), East China University of Science and Technology, Shanghai 200237, China
| | - Renchuan Zhang
- Center for Biorefining and Department of Bioproducts and Biosystems Engineering, University of Minnesota, St. Paul, MN 55108, USA
| | - Dongjie Chen
- Center for Biorefining and Department of Bioproducts and Biosystems Engineering, University of Minnesota, St. Paul, MN 55108, USA
| | - Paul Chen
- Center for Biorefining and Department of Bioproducts and Biosystems Engineering, University of Minnesota, St. Paul, MN 55108, USA
| | - Hualing Wang
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, National Engineering Laboratory for High-concentration Refractory Organic Wastewater Treatment Technologies (NELHROWTT), East China University of Science and Technology, Shanghai 200237, China
| | - Yuhuan Liu
- State Key Laboratory of Food Science and Technology, Engineering Research Center for Biomass Conversion, Ministry of Education, Nanchang University, Nanchang 330047, China
| | - Roger Ruan
- Center for Biorefining and Department of Bioproducts and Biosystems Engineering, University of Minnesota, St. Paul, MN 55108, USA.
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10
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Wang P, Lin Y, Zou C, Zhao F, Liang S, Zheng S, Han S. Construction and screening of a glycosylphosphatidylinositol protein deletion library in Pichia pastoris. BMC Microbiol 2020; 20:262. [PMID: 32838766 PMCID: PMC7446130 DOI: 10.1186/s12866-020-01928-y] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2020] [Accepted: 07/29/2020] [Indexed: 12/23/2022] Open
Abstract
Background Glycosylphosphatidylinositol (GPI)-anchored glycoproteins have diverse intrinsic functions in yeasts, and they also have different uses in vitro. In this study, the functions of potential GPI proteins in Pichia pastoris were explored by gene knockout approaches. Results Through an extensive knockout of GPI proteins in P. pastoris, a single-gene deletion library was constructed for 45 predicted GPI proteins. The knockout of proteins may lead to the activation of a cellular response named the ‘compensatory mechanism’, which is characterized by changes in the content and relationship between cell wall polysaccharides and surface proteins. Among the 45 deletion strains, five showed obvious methanol tolerance, four owned high content of cell wall polysaccharides, and four had a high surface hydrophobicity. Some advantages of these strains as production hosts were revealed. Furthermore, the deletion strains with high surface hydrophobicity were used as hosts to display Candida antarctica lipase B (CALB). The strain gcw22Δ/CALB-GCW61 showed excellent fermentation characteristics, including a faster growth rate and higher hydrolytic activity. Conclusions This GPI deletion library has some potential applications for production strains and offers a valuable resource for studying the precise functions of GPI proteins, especially their putative functions.
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Affiliation(s)
- Pan Wang
- Guangdong Key Laboratory of Fermentation and Enzyme Engineering, School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, Guangdong, China
| | - Ying Lin
- Guangdong Key Laboratory of Fermentation and Enzyme Engineering, School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, Guangdong, China
| | - Chengjuan Zou
- Guangdong Key Laboratory of Fermentation and Enzyme Engineering, School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, Guangdong, China
| | - Fengguang Zhao
- Guangdong Key Laboratory of Fermentation and Enzyme Engineering, School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, Guangdong, China
| | - Shuli Liang
- Guangdong Key Laboratory of Fermentation and Enzyme Engineering, School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, Guangdong, China
| | - Suiping Zheng
- Guangdong Key Laboratory of Fermentation and Enzyme Engineering, School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, Guangdong, China
| | - Shuangyan Han
- Guangdong Key Laboratory of Fermentation and Enzyme Engineering, School of Biology and Biological Engineering, South China University of Technology, Guangzhou, 510006, Guangdong, China.
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11
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Medina-Moreno SA, Conde-Báez L, Jiménez-González A, Aguilar-López R, Rodríguez-Vázquez R, Tec-Caamal EN. Modelling hexadecane uptake strategies of a rhizospheric bacterial consortium under different hydrodynamic draft-tube airlift reactor conditions. Biochem Eng J 2020. [DOI: 10.1016/j.bej.2020.107611] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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12
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Zhang Y, Shi H, Gu J, Jiao Y, Han S, Akindolie MS, Wang Y, Zhang L, Tao Y. Anthraquinone-2,6-disulfonate enhanced biodegradation of dibutyl phthalate: Reducing membrane damage and oxidative stress in bacterial degradation. BIORESOURCE TECHNOLOGY 2020; 302:122845. [PMID: 32000129 DOI: 10.1016/j.biortech.2020.122845] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2019] [Revised: 01/15/2020] [Accepted: 01/16/2020] [Indexed: 06/10/2023]
Abstract
Plasticizer dibutyl phthalate (DBP) pollution has received more and more attention. In this study, a DBP degrading bacteria Enterobacter sp. DNB-S2 was found to suffer membrane damage and oxidative stress during DBP degradation. Physiological and transcriptome analysis showed that 100 μmol L-1 anthraquinone-2,6-disulfonate (AQDS) could enhance the ability of strain DNB-S2 for biodegradation of DBP. AQDS adjusted the cell surface structure, including increase levels of hydrophobic and unsaturated fatty acids. These changes increased the chemotactic ability of the strain DNB-S2 to the hydrophobic pollutant DBP and the fluidity of the cell membrane. The expression of methyl chemotactic protein and genes associated with cell membrane-fixed components were up-regulated. AQDS also improved the scavenging ability of ·OH and H2O2 of DNB-S2 by promoting expression genes related to glutathione metabolism, thereby reducing oxidative stress. These results will provide new insights into the biodegradation of DBP.
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Affiliation(s)
- Ying Zhang
- School of Resources and Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Hongtao Shi
- School of Resources and Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Jidong Gu
- Laboratory of Environmental Microbiology and Toxicology, School of Biological Sciences, The University of Hong Kong, Pokfulam Road, Hong Kong Special Administrative Region
| | - Yaqi Jiao
- School of Resources and Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Siyue Han
- School of Resources and Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Modupe Sarah Akindolie
- School of Resources and Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Yifan Wang
- School of Resources and Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Lin Zhang
- School of Resources and Environment, Northeast Agricultural University, Harbin 150030, PR China
| | - Yue Tao
- School of Resources and Environment, Northeast Agricultural University, Harbin 150030, PR China.
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13
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Li DC, Gao JF, Zhang SJ, Gao YQ, Sun LX. Enhanced granulation process, a more effective way of aerobic granular sludge cultivation in pilot-scale application comparing to normal granulation process: From the perspective of microbial insights. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 707:136106. [PMID: 31863990 DOI: 10.1016/j.scitotenv.2019.136106] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/24/2019] [Revised: 12/11/2019] [Accepted: 12/11/2019] [Indexed: 06/10/2023]
Abstract
Aerobic granular sludge (AGS) could be cultivated from only flocs (called normal granulation (NG) process) or mixture of flocs and crushed AGS (called enhanced granulation (EG) process), which might lead to different system performances such as granulation speed and pollutants removal efficiencies. However, the differences of mechanisms between NG and EG processes at microbial community level are still unknown. In this study, the NG and EG processes were implemented successively in a pilot-scale sequencing batch reactor (SBR) with certain amounts of additional carbon sources. Illumina MiSeq sequencing and quantitative PCR were applied to investigate the dynamics of bacterial communities during NG and EG processes and explore the possible explanations for faster EG process. The results showed that significant distinctions in bacterial diversities and community structures were observed between NG and EG processes. The major contributor to NG process was bacterial communities with 32.04% contribution. While EG process was more dependent on the interactions (73.16% contribution) between the bacterial communities and environmental variables (operational parameters and self-adaptive variable). EG process had higher relative abundances of functional bacteria than NG process. Glycogen accumulating organisms (GAOs) related bacteria with a total relative abundance of maximum 65.43% might be mainly responsible for the faster EG process. This study provided microbial insights for practical application of AGS technology that inoculating crushed AGS might be an effective way to cultivate AGS.
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Affiliation(s)
- Ding-Chang Li
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
| | - Jing-Feng Gao
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China.
| | - Shu-Jun Zhang
- Research and Development Center of Beijing Drainage Group Co. Ltd, Beijing 100124, China
| | - Yong-Qing Gao
- Research and Development Center of Beijing Drainage Group Co. Ltd, Beijing 100124, China
| | - Li-Xin Sun
- Research and Development Center of Beijing Drainage Group Co. Ltd, Beijing 100124, China
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14
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Du R, Cao S, Zhang H, Peng Y. Formation of partial-denitrification (PD) granular sludge from low-strength nitrate wastewater: The influence of loading rates. JOURNAL OF HAZARDOUS MATERIALS 2020; 384:121273. [PMID: 31585283 DOI: 10.1016/j.jhazmat.2019.121273] [Citation(s) in RCA: 22] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/27/2019] [Revised: 09/18/2019] [Accepted: 09/20/2019] [Indexed: 06/10/2023]
Abstract
Granular sludge has been believed to be a promising technology in wastewater biological treatment. However, the formation of granules at low substrate concentration is a difficult task that has seldom been achieved. This study aimed at forming the granules in the recently developed partial-denitrification (PD, NO3--N→NO2--N) for nitrite production. Two sequencing batch reactors (SBRs) were operated at a low nitrate of 30 mg N/L with nitrate loading rate (NLR) of 0.12 (R1) and 0.24 kg N/m3/d (R2). Results showed that the granulation of PD sludge experienced a developing and matured process with the progressive increase in size followed by maintaining a stable value. Higher NLR resulted in a more rapid granulation with the larger and looser structure. While the granules under lower NLR appeared to be denser and more compact with better settling ability. Microbial communities of two SBRs were revealed to show little difference, with the PD functional bacteria of Thauera (50.7% in R1 and 55.4% in R2) dominated during the granulation process. The Flavobacterium, likely to be closely related with sludge granulation, accounted for a higher proportion in R2 (10.16%) than R1 (5.91%), which might result in a larger granule formed in R2. This study clearly confirmed the feasibility of granulation of PD sludge under low nitrogen loads, shedding new light on the low-strength nitrate wastewater treatment with an efficient and economical way.
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Affiliation(s)
- Rui Du
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, 100124, China
| | - Shenbin Cao
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China; Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore, 637141, Singapore
| | - Hanyu Zhang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, 100124, China
| | - Yongzhen Peng
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing, 100124, China.
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15
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Cao S, Du R, Zhang H, Peng Y. Understanding the granulation of partial denitrification sludge for nitrite production. CHEMOSPHERE 2019; 236:124389. [PMID: 31344621 DOI: 10.1016/j.chemosphere.2019.124389] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2019] [Revised: 07/13/2019] [Accepted: 07/16/2019] [Indexed: 06/10/2023]
Abstract
Partial-denitrification (PD) has previously been demonstrated to be another pathway for nitrite production, which provides a cost-effective approach for nitrate (NO3--N) removal through combing with anammox. In this study, the formation of PD granules was firstly investigated in a sequencing batch reactor (SBR) with influent nitrate of 60 mg N/L. The granulation process was explored via the physicochemical and biological characterization. Sludge granulation initiated within the first 20 days with an average size of 93.7 μm in diameter, it experienced a developing, shaping and matured periods, with a maximum size of 709.3 μm obtained. High nitrite production of PD was always maintained during the granulation with a mean nitrate-to-nitrite transformation ratio (NTR) of 88.3%, and in-situ maximum NO3-N reduction rate of 84.9 mg N/h/g VSS was obtained. Mature PD granules hold an excellent settling property with 5-min sludge volume index (SVI5) of 32.0 mL/g MLSS obtained and smooth surface with large amounts of rod bacteria covered. CaCO3 precipitates formed in the PD process played a vital role in the initial granulation, acting as the nucleus for cell attachment. Extracellular polymeric substances (EPS), mainly the proteins (PN) content, was found to be of supreme importance in granules developing and maintaining its structural stability. Besides, the abundance of Flavobacterium and norank_p__Gracilibacteria were revealed to be in accordance with the change of granules size, seemed to contribute to sludge granulation. The developed granule-based PD integrated with anammox process provides an engineering-feasible and economic-favorable solution for industrial nitrate wastewater treatment.
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Affiliation(s)
- Shenbin Cao
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China; Advanced Environmental Biotechnology Centre, Nanyang Environment and Water Research Institute, Nanyang Technological University, 1 Cleantech Loop, Singapore, 637141, Singapore
| | - Rui Du
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering and Technology Research Center of Beijing, Beijing University of Technology, Beijing, 100124, China
| | - Hanyu Zhang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering and Technology Research Center of Beijing, Beijing University of Technology, Beijing, 100124, China
| | - Yongzhen Peng
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China; National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering and Technology Research Center of Beijing, Beijing University of Technology, Beijing, 100124, China.
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16
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Zhao Y, Jiang B, Tang X, Liu S. Metagenomic insights into functional traits variation and coupling effects on the anammox community during reactor start-up. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 687:50-60. [PMID: 31202013 DOI: 10.1016/j.scitotenv.2019.05.491] [Citation(s) in RCA: 38] [Impact Index Per Article: 7.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2019] [Revised: 05/08/2019] [Accepted: 05/31/2019] [Indexed: 06/09/2023]
Abstract
Anammox technology is an energy-efficient wastewater treatment process and anammox community structure has gained extensive attention. However, the dynamics of community functional traits are still elusive. Here, we combined the long-term reactor operation and metagenomic, multiple bioinformatic and network analyses to reveal the succession of anammox community and function traits during reactor start-up. We found the cooperation of denitrifiers that affiliated to the phylum Proteobacteria could reduce nitrite to dinitrogen gas. These organisms and genes had higher abundance after the inhibition phase, which could contribute to nitrite consuming and reactor performance recovery. Importantly, the Terrimonas and Anaerolinea organisms had ability of extracellular polymers secretion or aggregate formation. They had the highest abundance at the end of the lag phase, which could benefit for promoting the nitrogen removal rate (NRR). Meanwhile, Terrimonas and Anaerolinea bacteria could cooperate with methanogenic and nitrite-denitrifying methanotrophic organisms based on H2 and CH4, respectively. Since these organisms also had higher abundance after the inhibition phase, their cooperation could prevent anammox bacteria from nitrite inhibiting when the influent nitrite concentration was higher. The analysis of community and function shift is expected to emphasize the importance of functional bacteria in anammox process and provides a potential control strategy for nitrogen-containing wastewater treatment process.
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Affiliation(s)
- Yunpeng Zhao
- College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; Key Laboratory of Water and Sediment Sciences, Ministry of Education of China, Beijing 100871, China
| | - Bo Jiang
- College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; Key Laboratory of Water and Sediment Sciences, Ministry of Education of China, Beijing 100871, China
| | - Xi Tang
- College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; Key Laboratory of Water and Sediment Sciences, Ministry of Education of China, Beijing 100871, China
| | - Sitong Liu
- College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China; State Key Laboratory of Plateau Ecology and Agriculture, Qinghai University, Xining 810016, Qinghai, China.
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17
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Faria CV, Souza DF, Pontes TM, Amaral MCS, Fonseca FV. Strategies of anaerobic sludge granulation in an EGSB reactor. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2019; 244:69-76. [PMID: 31108312 DOI: 10.1016/j.jenvman.2019.05.015] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/17/2018] [Revised: 04/12/2019] [Accepted: 05/03/2019] [Indexed: 06/09/2023]
Abstract
Anaerobic sludge granulation was evaluated in an expanded granular sludge bed (EGSB) reactor based on the increases in the specific organic loading rate (SOLR). The effect of precursor substances (calcium chloride, sodium chloride, and tannin) on the development of granular sludge was also investigated in batch reactors. The reactors were fed with synthetic sewage and operated in mesophilic conditions. The EGSB was operated with a variable hydraulic retention time (HRT) and the batch reactors, with cycles of 8 h and 16 h. The increase of SOLR from 17.4 ± 7.4 to 104.6 ± 66.7 mgCOD gVSS-1 d-1 in the EGSB resulted in an increase on the average granules diameter from 344.3 to 1583.3 μm. These conditions also favored the reduction rates of chemical oxygen demand (COD) and volatile fatty acids (VFAs) concentration in the reactor. When the upflow velocity suffered an abrupt increase (from 0.06 L h-1 to 0.25 L h-1), the granules size began to decrease and lose their settleability characteristics. Considering this, it is proposed to start the biomass granulation process without effluent recirculation, and, after the granules reach the desired size and settleability capacity, the normal operation of EGSB reactor starts. The results showed that calcium chloride was more efficient for granulation. CaCl2 addition can be performed only during the reactor's start-up, improving granulation and reducing start-up time. Thus, these results have practical implications as granules maintenance is the key to the proper EGSB operation.
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Affiliation(s)
- C V Faria
- School of Chemistry, UFRJ, Federal University of Rio de Janeiro, Av. Athos da Silva Ramos 149, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, RJ, 21941-909, Brazil.
| | - D F Souza
- Department of Chemical Engineering, Pontifical Catholic University of Minas Gerais, Av. Dom José Gaspar, 500, Coração Eucarístico, Belo Horizonte, MG, 30535-901, Brazil.
| | - T M Pontes
- Department of Chemical Engineering, Pontifical Catholic University of Minas Gerais, Av. Dom José Gaspar, 500, Coração Eucarístico, Belo Horizonte, MG, 30535-901, Brazil.
| | - M C S Amaral
- School of Engineering, UFMG, Federal University of Minas Gerais, Av. Antônio Carlos, 6627, Pampulha, Belo Horizonte, MG, 31270-901, Brazil.
| | - F V Fonseca
- School of Chemistry, UFRJ, Federal University of Rio de Janeiro, Av. Athos da Silva Ramos 149, Cidade Universitária, Ilha do Fundão, Rio de Janeiro, RJ, 21941-909, Brazil.
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18
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Liu X, Zeng A, Wang Y, Liu P, Chen Y, Jiang Y. Comparison and strategy of nitrogen removal at different low temperatures in a pilot-scale A 2/O system. ENVIRONMENTAL TECHNOLOGY 2019; 40:2473-2481. [PMID: 29471739 DOI: 10.1080/09593330.2018.1444099] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/27/2017] [Accepted: 02/17/2018] [Indexed: 06/08/2023]
Abstract
To ensure low effluent total nitrogen (TN ≤ 15 mg L-1) and NH3-N( ≤ 5 mg L-1) at low temperatures (8.8-14.7°C), a pilot-scale A2/O system with a low return activated sludge (200%) was employed to seek the optimal operation strategy. In the 90 days' experiment, the tests were separated into three stages (14.2°C, 11.0°C, and 9.1°C), and the 49 samples were analysed. Our results showed that the nitrification was remarkably inhibited when the temperature was below 10°C, while the denitrification was remarkably inhibited at the temperatures of 10-15°C. Once the effluent NH3-N concentration was over 2.5 mg L-1, or NO3--N concentration was over 13 mg L-1, the effluent TN would be in excess of 15 mg L-1. When the temperature was over 10°C, increasing dissolved oxygen (DO) was an optimal strategy to reduce the effluent NH3-N; nevertheless, when the temperature was below 10°C, simultaneously increasing DO and MLVSS would be carried out due to the low max. nitrification rates (36.0 mg (g-1 d-1)). If the carbon source (CODcr/ NO3--N ratio ≥ 7.3) was enough, increasing MLVSS was an effective method to relieve the negative influence of low temperature on denitrification.
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Affiliation(s)
- Xiaoying Liu
- a School of Civil Engineering and Architecture, Wuhan University of Technology , Wuhan , People's Republic of China
- b Urban Water Supply and Water Pollution Control Technology Research Centre, Wuhan University of Technology , Wuhan , People's Republic of China
| | - Ao Zeng
- a School of Civil Engineering and Architecture, Wuhan University of Technology , Wuhan , People's Republic of China
| | - Yatao Wang
- a School of Civil Engineering and Architecture, Wuhan University of Technology , Wuhan , People's Republic of China
- c School of Urban Construction, Wuhan University of Science and Technology , Wuhan , People's Republic of China
| | - Peiju Liu
- a School of Civil Engineering and Architecture, Wuhan University of Technology , Wuhan , People's Republic of China
| | - Yuan Chen
- a School of Civil Engineering and Architecture, Wuhan University of Technology , Wuhan , People's Republic of China
| | - Yinghe Jiang
- a School of Civil Engineering and Architecture, Wuhan University of Technology , Wuhan , People's Republic of China
- b Urban Water Supply and Water Pollution Control Technology Research Centre, Wuhan University of Technology , Wuhan , People's Republic of China
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19
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Li C, Li W, Li H, Hou M, Wu X, Zhuang JL, Liu YD. The effect of quorum sensing on performance of salt-tolerance aerobic granular sludge: linking extracellular polymeric substances and microbial community. Biodegradation 2019; 30:447-456. [PMID: 31342221 DOI: 10.1007/s10532-019-09886-7] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2019] [Accepted: 07/18/2019] [Indexed: 11/26/2022]
Abstract
Aerobic granular sludge (AGS) technology is generally negatively affected by the salinity in high saline organic wastewater. The effect of salinity on organic pollutants removal of AGS was studied in three parallel sequencing batch reactors. The results indicated that the performance of reactors operating at relative low salinity (1%) remained stable. However, at medium salinity (2%) and higher salinity (4%) conditions, the organic pollutants removal efficiencies deteriorated from 93.7 ± 3.0 to 71.6 ± 6.8 and 53.6 ± 5.4%, respectively. The addition of a mixture of acyl-homoserine lactone (AHL) mediated quorum sensing (QS) signaling molecules (0.1 μmol/L of mixed C6-HSL, C8-HSL and 3OC8-HSL) only restored the performance of the 2% salinity reactor back to 86.3 ± 6.2% due to the changing of hydrophobic extracellular polymeric substance ratio from 64 ± 3 to 71 ± 4%. Addition of the AHL had no effect on the pollution removal efficiency at the 4% salinity conditions. Microbial community analysis showed that Dyella (32.3%) species were the dominant member of the community and its occurrence was positively correlated with organic pollutants removal efficiency at relative high salinity (2% and 4%), while Mangrovibacter showed the opposite trend. Higher abundances of hdtS and acylase genes, the synthesis and degradation genes of AHL, were found after adding AHLs to reactors at 2% salinity, which indicated that AHL mediated QS was the primary QS system in salt-tolerant AGS.
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Affiliation(s)
- Cheng Li
- School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Wei Li
- School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China.
- National Engineering Laboratory for Industrial Wastewater Treatment, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China.
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China.
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China.
| | - Hui Li
- Institute for Environmental Pollution and Health, School of Environmental and Chemical Engineering, Shanghai University, Shanghai, 200444, China
| | - Meng Hou
- School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Xiao Wu
- School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Jin-Long Zhuang
- School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China
| | - Yong-di Liu
- School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China.
- National Engineering Laboratory for Industrial Wastewater Treatment, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China.
- State Environmental Protection Key Laboratory of Environmental Risk Assessment and Control on Chemical Process, School of Resources and Environmental Engineering, East China University of Science and Technology, Shanghai, 200237, China.
- Shanghai Institute of Pollution Control and Ecological Security, Shanghai, 200092, China.
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20
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Zhang Z, Cao R, Jin L, Zhu W, Ji Y, Xu X, Zhu L. The regulation of N-acyl-homoserine lactones (AHLs)-based quorum sensing on EPS secretion via ATP synthetic for the stability of aerobic granular sludge. THE SCIENCE OF THE TOTAL ENVIRONMENT 2019; 673:83-91. [PMID: 30986684 DOI: 10.1016/j.scitotenv.2019.04.052] [Citation(s) in RCA: 66] [Impact Index Per Article: 13.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/14/2019] [Revised: 03/13/2019] [Accepted: 04/04/2019] [Indexed: 06/09/2023]
Abstract
According to the relationship among microbial activity, quorum sensing (QS) and structural stability of aerobic granular sludge, the mechanism of QS regulation for microbial activity and granular stability was investigated in AGS process. Results showed that ATP content decreased sharply from 1.8 μmol/gVSS of stable granules to 0.8 μmol/gVSS of disintegrating granules, and the relative abundance of QS-activity microbes, Rhodobacter spp. and Xanthomonadaceae decreased in initially unstable granules compared with stable granules. The main AHLs were detected in this study, and C8-HSL, 3OHC8-HSL and 3OHC12-HSL decreased significantly when structure of granules changed from stability to disintegration. Accompanying with the decrease of AHLs level, the extracellular polymeric substances (EPS) content in initially unstable granules decreased sharply from 226.8 to 163.6 mg/gVSS with the ratio of extracellular protein to exopolysaccharide (PN/PS) decreasing from 3.6 to 2.2, despite EPS-secretion microbes enriched. The effect of QS on microbial activity was proved by AHL add-back study, results indicated that ATP and EPS content in sludge increased significantly (p < 0.05) with AHLs added, but EPS production was limited when ATP synthesis was disrupted. It was concluded that the AHLs-based QS favored the granular stability via the enhancement of ATP synthesis in microbes. This study provides a new perspective for QS regulation in aerobic granular sludge system, because the ATP regulated by QS could be the energy currency for cellular metabolism, such as nutrient removal, degradation of emerging pollutants, microbial growth and other aspects.
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Affiliation(s)
- Zhiming Zhang
- Institute of Environmental Pollution Control and Treatment, Zhejiang University, Hangzhou 310058, China
| | - Runjuan Cao
- Institute of Environmental Pollution Control and Treatment, Zhejiang University, Hangzhou 310058, China
| | - Luonan Jin
- Hangzhou Urban & Rural Construction Design Institute Co., LTD, Hangzhou 310058, China
| | - Weitang Zhu
- Environmental Protection Bureau of Changxing County, Huzhou 313100, China
| | - Yatong Ji
- Institute of Environmental Pollution Control and Treatment, Zhejiang University, Hangzhou 310058, China
| | - Xiangyang Xu
- Institute of Environmental Pollution Control and Treatment, Zhejiang University, Hangzhou 310058, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou 310058, China; Zhejiang Provincial Engineering Laboratory of Water Pollution Control, 388 Yuhangtang Road, Hangzhou 310058, China
| | - Liang Zhu
- Institute of Environmental Pollution Control and Treatment, Zhejiang University, Hangzhou 310058, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou 310058, China; Zhejiang Provincial Engineering Laboratory of Water Pollution Control, 388 Yuhangtang Road, Hangzhou 310058, China.
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21
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Dasgupta S, De Clippeleir H, Goel R. Short operational differences support granulation in a lab scale reactor in comparison to another conventional activated sludge reactor. BIORESOURCE TECHNOLOGY 2019; 271:417-426. [PMID: 30317147 DOI: 10.1016/j.biortech.2018.09.111] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/11/2018] [Revised: 09/19/2018] [Accepted: 09/21/2018] [Indexed: 06/08/2023]
Abstract
This study explains how small operational differences support excellent granulation in aerobic granular reactors. Short settling time promoted granulation in AGS reactor. Gene expressions based on mRNA revealed much higher ammonium monooxygenase (amoA) in conventional reactor biomass than in the aerobic granular reactor (AGS) biomass during a complete cycle operation. The number of glycogen accumulating organisms in conventional was much higher than in the granular reactor. The denitrifying functional genes in the granular systems were upregulated in anaerobic and aerobic phases. The granular reactor removed 1.84 kg COD-m-3day-1, 0.09 kg NH4+-N-m-3day-1, and 0.063 kg PO43-P-m-3day-1. The conventional reactor removed 1.14 Kg-m-3day-1 COD, 0.05 kg-m-3day-1 NH4+-N, and 0.028 kg-m-3day-1 PO43--P. The granular reactor showed faster kinetics for nutrient and organics removal compared to the conventional reactor. Flocs in the conventional reactor had a lower abundance of Candidatus accumulibacter sp. and higher relative abundance of Candidatus competibacter.
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Affiliation(s)
- Sunayna Dasgupta
- Civil & Environmental Engineering, University of Utah, Salt Lake City, UT 84112, United States
| | - Haydee De Clippeleir
- District of Columbia Water and Sewer Authority, 5000 Overlook Avenue, SW, Washington, DC 20032, United States
| | - Ramesh Goel
- Civil & Environmental Engineering, University of Utah, Salt Lake City, UT 84112, United States.
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22
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Wilén BM, Liébana R, Persson F, Modin O, Hermansson M. The mechanisms of granulation of activated sludge in wastewater treatment, its optimization, and impact on effluent quality. Appl Microbiol Biotechnol 2018; 102:5005-5020. [PMID: 29705957 PMCID: PMC5960003 DOI: 10.1007/s00253-018-8990-9] [Citation(s) in RCA: 73] [Impact Index Per Article: 12.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/24/2018] [Revised: 04/04/2018] [Accepted: 04/05/2018] [Indexed: 12/14/2022]
Abstract
Granular activated sludge has gained increasing interest due to its potential in treating wastewater in a compact and efficient way. It is well-established that activated sludge can form granules under certain environmental conditions such as batch-wise operation with feast-famine feeding, high hydrodynamic shear forces, and short settling time which select for dense microbial aggregates. Aerobic granules with stable structure and functionality have been obtained with a range of different wastewaters seeded with different sources of sludge at different operational conditions, but the microbial communities developed differed substantially. In spite of this, granule instability occurs. In this review, the available literature on the mechanisms involved in granulation and how it affects the effluent quality is assessed with special attention given to the microbial interactions involved. To be able to optimize the process further, more knowledge is needed regarding the influence of microbial communities and their metabolism on granule stability and functionality. Studies performed at conditions similar to full-scale such as fluctuation in organic loading rate, hydrodynamic conditions, temperature, incoming particles, and feed water microorganisms need further investigations.
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Affiliation(s)
- Britt-Marie Wilén
- Division of Water Environment Technology, Department of Architecture and Civil and Engineering, Chalmers University of Technology, SE-412 96, Gothenburg, Sweden.
| | - Raquel Liébana
- Division of Water Environment Technology, Department of Architecture and Civil and Engineering, Chalmers University of Technology, SE-412 96, Gothenburg, Sweden
| | - Frank Persson
- Division of Water Environment Technology, Department of Architecture and Civil and Engineering, Chalmers University of Technology, SE-412 96, Gothenburg, Sweden
| | - Oskar Modin
- Division of Water Environment Technology, Department of Architecture and Civil and Engineering, Chalmers University of Technology, SE-412 96, Gothenburg, Sweden
| | - Malte Hermansson
- Department of Chemistry and Molecular Biology, University of Gothenburg, SE-405 30, Gothenburg, Sweden
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23
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The attachment potential and N-acyl-homoserine lactone-based quorum sensing in aerobic granular sludge and algal-bacterial granular sludge. Appl Microbiol Biotechnol 2018; 102:5343-5353. [DOI: 10.1007/s00253-018-9002-9] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2017] [Revised: 04/03/2018] [Accepted: 04/07/2018] [Indexed: 01/15/2023]
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24
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Zhan F, Yang J, Li J, Wang Y, Li B. Characteristics of the interaction mechanism between tannic acid and sodium caseinate using multispectroscopic and thermodynamics methods. Food Hydrocoll 2018. [DOI: 10.1016/j.foodhyd.2017.09.010] [Citation(s) in RCA: 53] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/29/2022]
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25
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Arcila JS, Buitrón G. Influence of solar irradiance levels on the formation of microalgae-bacteria aggregates for municipal wastewater treatment. ALGAL RES 2017. [DOI: 10.1016/j.algal.2017.09.011] [Citation(s) in RCA: 69] [Impact Index Per Article: 9.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/04/2023]
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26
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He Q, Zhang W, Zhang S, Zou Z, Wang H. Performance and microbial population dynamics during stable operation and reactivation after extended idle conditions in an aerobic granular sequencing batch reactor. BIORESOURCE TECHNOLOGY 2017; 238:116-121. [PMID: 28433898 DOI: 10.1016/j.biortech.2017.03.181] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/22/2017] [Revised: 03/29/2017] [Accepted: 03/30/2017] [Indexed: 06/07/2023]
Abstract
The evolution of removal performance and bacterial population dynamics of an aerobic granular sequencing batch reactor were investigated during stable operation and reactivation after prolonged storage. The system was run for a period of 130days including the stable condition phase, storage period and the subsequent reactivation process. Excellent removal performance was obtained during the stable operation period, which was decayed by the extended idle conditions. The removal efficiencies for both carbon and nitrogen decayed while phosphorus removal remained unaffected. Both granules structure and physical properties could be fully restored. Microbial populations shifted sharply and the storage perturbations irreversibly altered the microbial communities at different levels. Extracellular polymeric substances (especially protein) and key groups were identified as contributors for storage and re-startup of the aerobic granular system.
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Affiliation(s)
- Qiulai He
- School of Civil Engineering, Wuhan University, Wuhan 430072, China
| | - Wei Zhang
- School of Civil Engineering, Wuhan University, Wuhan 430072, China
| | - Shilu Zhang
- School of Civil Engineering, Wuhan University, Wuhan 430072, China
| | - Zhuocheng Zou
- School of Civil Engineering, Wuhan University, Wuhan 430072, China
| | - Hongyu Wang
- School of Civil Engineering, Wuhan University, Wuhan 430072, China.
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27
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Lin H, Zhu X, Wang Y, Yu X. Effect of sodium hypochlorite on typical biofilms formed in drinking water distribution systems. JOURNAL OF WATER AND HEALTH 2017; 15:218-227. [PMID: 28362303 DOI: 10.2166/wh.2017.141] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
Human health and biological safety problems resulting from urban drinking water pipe network biofilms pollution have attracted wide concern. Despite the inclusion of residual chlorine in drinking water distribution systems supplies, the bacterium is a recalcitrant human pathogen capable of forming biofilms on pipe walls and causing health risks. Typical drinking water bacterial biofilms and their response to different concentrations of chlorination was monitored. The results showed that the four bacteria all formed single biofilms susceptible to sodium hypochlorite. After 30 min disinfection, biomass and cultivability decreased with increasing concentration of disinfectant but then increased in high disinfectant doses. PMA-qPCR results indicated that it resulted in little cellular damage. Flow cytometry analysis showed that with increasing doses of disinfectant, the numbers of clusters increased and the sizes of clusters decreased. Under high disinfectant treatment, EPS was depleted by disinfectant and about 0.5-1 mg/L of residual chlorine seemed to be appropriate for drinking water treatment. This research provides an insight into the EPS protection to biofilms. Resistance of biofilms against high levels of chlorine has implications for the delivery of drinking water.
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Affiliation(s)
- Huirong Lin
- Institute of Urban Environment, Chinese Academy of Science, Xiamen 361021, China E-mail:
| | - Xuan Zhu
- Xiamen No. 2 Hospital, Xiamen 361021, China
| | - Yuxin Wang
- Xiamen No. 2 Hospital, Xiamen 361021, China
| | - Xin Yu
- Institute of Urban Environment, Chinese Academy of Science, Xiamen 361021, China E-mail:
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Cao F, Bourven I, Lens PNL, van Hullebusch ED, Pechaud Y, Guibaud G. Hydrophobic features of EPS extracted from anaerobic granular sludge: an investigation based on DAX-8 resin fractionation and size exclusion chromatography. Appl Microbiol Biotechnol 2016; 101:3427-3438. [PMID: 28012045 DOI: 10.1007/s00253-016-8053-z] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Revised: 11/14/2016] [Accepted: 12/05/2016] [Indexed: 12/23/2022]
Abstract
The hydrophobic fractionation of extracellular polymeric substances (EPS) extracted from anaerobic granular sludge was performed on the DAX-8 resin (two elution pH conditions, i.e., pH 2 and pH 5 were tested). The impact of seven different EPS extraction methods on EPS hydrophobicity features was assessed. The results showed that the extraction methods and bulk solution pH influenced dramatically the biochemical composition of the EPS, and in turn, the hydrophobicity determined. Besides, EPS extracting reagents i.e., formaldehyde, ethanol, sodium dodecyl sulfate (SDS), and Tween 20 not only introduced extra carbon content in the total organic carbon (TOC) measurement but also interacted with the DAX-8 resin. By comparing the apparent molecular weight (aMW) distribution of untreated and pH-adjusted EPS samples, more complete EPS aMW information was preserved at pH 5. Thus, elution at pH 5 was preferred in this study for the qualitative analysis of EPS hydrophobic features. The hydrophobic fraction of EPS retained by the resin at pH 5 was ascribed to a wide aMW range, ranging from >440 to 0.3 kDa. Within this range, EPS molecules ranging from 175 to 31 kDa were mostly retained by the DAX-8 resin, which indicates that these EPS molecules are highly hydrophobic.
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Affiliation(s)
- Feishu Cao
- Laboratoire Géomatériaux et Environnement (EA 4508), Université Paris-Est, UPEM, 77454, Marne-la-Vallée, France.,Groupement de Recherche Eau Sol Environnement (EA 4330), Faculté des Sciences et Techniques, Université de Limoges, 123 Avenue A. Thomas, 87060, Limoges Cedex, France.,UNESCO-IHE Institute for Water Education, Westvest 7, 2611 AX, Delft, The Netherlands
| | - Isabelle Bourven
- Groupement de Recherche Eau Sol Environnement (EA 4330), Faculté des Sciences et Techniques, Université de Limoges, 123 Avenue A. Thomas, 87060, Limoges Cedex, France
| | - Piet N L Lens
- UNESCO-IHE Institute for Water Education, Westvest 7, 2611 AX, Delft, The Netherlands
| | - Eric D van Hullebusch
- Laboratoire Géomatériaux et Environnement (EA 4508), Université Paris-Est, UPEM, 77454, Marne-la-Vallée, France.,UNESCO-IHE Institute for Water Education, Westvest 7, 2611 AX, Delft, The Netherlands
| | - Yoan Pechaud
- Laboratoire Géomatériaux et Environnement (EA 4508), Université Paris-Est, UPEM, 77454, Marne-la-Vallée, France
| | - Gilles Guibaud
- Groupement de Recherche Eau Sol Environnement (EA 4330), Faculté des Sciences et Techniques, Université de Limoges, 123 Avenue A. Thomas, 87060, Limoges Cedex, France.
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29
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Analysis of bacterial, fungal and archaeal populations from a municipal wastewater treatment plant developing an innovative aerobic granular sludge process. World J Microbiol Biotechnol 2016; 33:14. [DOI: 10.1007/s11274-016-2179-0] [Citation(s) in RCA: 26] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/04/2016] [Accepted: 11/14/2016] [Indexed: 11/26/2022]
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30
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Li Y, Zheng P, Zhang M, Zeng Z, Wang Z, Ding A, Ding K. Hydrophilicity/hydrophobicity of anaerobic granular sludge surface and their causes: An in situ research. BIORESOURCE TECHNOLOGY 2016; 220:117-123. [PMID: 27566520 DOI: 10.1016/j.biortech.2016.08.012] [Citation(s) in RCA: 31] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/05/2016] [Revised: 07/29/2016] [Accepted: 08/04/2016] [Indexed: 06/06/2023]
Abstract
The pursuit of high-rate anaerobic reactor has powerfully promoted the studies of anaerobic granular sludge (AnGS) recently. In this work, Methylene Blue and Rhodamine B were used as hydrophilic/hydrophobic indicators to investigate the hydrophilicity/hydrophobicity of AnGS, and several analysis methods were applied to reveal the causes of difference in hydrophilicity/hydrophobicity between the surface and interior of AnGS. Results showed that hydrophilic/hydrophobic surface area ratios for intact and loose AnGS were 1.587 and 1.207, respectively, indicating that the surface was more hydrophilic than the interior. Such difference was ascribed to spatial distribution discrepancy of polysaccharides and proteins of extracellular polymeric substance. The different relative contents of polar groups like -OH, CO, -NH2 and nonpolar groups like side chains of aromatic amino acids were suggested to be the primary causes that lead to the difference. The results are meaningful for the cultivation of high-activity AnGS and the development of anaerobic technology.
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Affiliation(s)
- Yiyu Li
- Department of Environmental Engineering, Zhejiang University, Hangzhou, China
| | - Ping Zheng
- Department of Environmental Engineering, Zhejiang University, Hangzhou, China.
| | - Meng Zhang
- Department of Environmental Engineering, Zhejiang University, Hangzhou, China
| | - Zhuo Zeng
- Department of Environmental Engineering, Zhejiang University, Hangzhou, China
| | - Zhiyao Wang
- Department of Environmental Engineering, Zhejiang University, Hangzhou, China
| | - Aqiang Ding
- Department of Environmental Engineering, Zhejiang University, Hangzhou, China
| | - Keke Ding
- Department of Environmental Science, Zhejiang University, Hangzhou, China
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31
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Rodriguez-Sanchez A, Purswani J, Lotti T, Maza-Marquez P, van Loosdrecht MCM, Vahala R, Gonzalez-Martinez A. Distribution and microbial community structure analysis of a single-stage partial nitritation/anammox granular sludge bioreactor operating at low temperature. ENVIRONMENTAL TECHNOLOGY 2016; 37:2281-2291. [PMID: 26829222 DOI: 10.1080/09593330.2016.1147613] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/30/2015] [Accepted: 01/24/2016] [Indexed: 06/05/2023]
Abstract
In the last decade, autotrophic nitrogen removal technologies based on anammox metabolism have become state of the art in urban and industrial wastewater treatment systems, due to their advantages over traditional nitrogen removal processes. However, their application is currently limited to the treatment of warm wastewater (25-40°C) mainly due to the low growth rate of the anammox bacteria. The extension of the application field to wastewater characterized by lower temperatures (8-20°C), such as those typical for municipal sewage, allows the design of treatment systems with a net energy production. In this study, the distribution and bacterial community structure of a lab-scale single-stage partial nitritation/anammox (PN/A) granular sludge bioreactor operating at low temperatures was analysed using next-generation sequencing techniques. The presence of ammonium-oxidizing bacteria and anammox bacteria was found, but the appearance of other bacterial species shows a complex microbial ecosystem. Evaluation of ecological roles of representative species inside the single-stage PN/A bioreactor was accomplished. Results obtained will be helpful for the future design and operation of PN/A systems performing at low temperatures.
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Affiliation(s)
| | - Jessica Purswani
- a Institute of Water Research , University of Granada , Granada , Spain
| | - Tommaso Lotti
- b Department of Biotechnology , Technical University of Delft , Delft , The Netherlands
| | | | - M C M van Loosdrecht
- b Department of Biotechnology , Technical University of Delft , Delft , The Netherlands
| | - Riku Vahala
- c Department of Built Environment , School of Engineering, Aalto University , Aalto , Espoo , Finland
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Cai W, Huang W, Li H, Sun B, Xiao H, Zhang Z, Lei Z. Acetate favors more phosphorus accumulation into aerobic granular sludge than propionate during the treatment of synthetic fermentation liquor. BIORESOURCE TECHNOLOGY 2016; 214:596-603. [PMID: 27183235 DOI: 10.1016/j.biortech.2016.05.015] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Revised: 05/02/2016] [Accepted: 05/05/2016] [Indexed: 06/05/2023]
Abstract
Anaerobic digestion (AD) is an efficient biotechnology widely applied for energy and resource recovery from organic waste and wastewater treatment. The effluent from AD or fermentation liquor containing organic substances like volatile fatty acids (VFAs) and mineral nutrients (such as N and P), however, will trigger serious environmental issues if not properly dealt with. In this study two identical sequencing batch reactors (SBRs), namely Ra and Rp were used to cultivate aerobic granules for P recovery from synthetic fermentation liquor, respectively using acetate and propionate as additional carbon source. Larger and more stable granules were achieved in Ra with higher P removal capability (9.4mgP/g-VSS·d) and higher anaerobic P release (6.9mgP/g-VSS·h). In addition to much higher P content (78mgP/g-SS), bioavailable P in Ra-granules increased to 45mgP/g-SS, approximately 2-times those of seed sludge and Rp-granules. Microbial community analysis indicated that more GAOs were accumulated in Rp-granules.
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Affiliation(s)
- Wei Cai
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan
| | - Wenli Huang
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan; Key Laboratory of Pollution Process and Environmental Criteria, Ministry of Education, College of Environmental Science and Engineering, Nankai University, 94 Weijin Road, Tianjin 300071, China
| | - Huifang Li
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan
| | - Beina Sun
- Shanghai Biotechnology Corporation, 151 Libing Road, Shanghai 201203, China
| | - Huasheng Xiao
- Shanghai Biotechnology Corporation, 151 Libing Road, Shanghai 201203, China
| | - Zhenya Zhang
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan
| | - Zhongfang Lei
- Graduate School of Life and Environmental Sciences, University of Tsukuba, 1-1-1 Tennodai, Tsukuba, Ibaraki 305-8572, Japan.
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33
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Cao Z, Zhang M, Zhang J, Zhang H. Impact of continuous and intermittent supply of electric assistance on high-strength 2,4-dichlorophenol (2,4-DCP) degradation in electro-microbial system. BIORESOURCE TECHNOLOGY 2016; 212:138-143. [PMID: 27092992 DOI: 10.1016/j.biortech.2016.03.165] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/05/2016] [Revised: 03/30/2016] [Accepted: 03/31/2016] [Indexed: 06/05/2023]
Abstract
The high-strength 2,4-DCP, which exists in two states: dissolved and colloidal, was studied by a continuously electro-microbial system (CEMS) and an intermittently electro-microbial system (IEMS). The hydrolysis rate of colloidal 2,4-DCP in the IEMS without electric assistance was much higher than that in the CEMS. However, the degradation rate of the dissolved 2,4-DCP and the dissolved intermediates (2-chlorophenol and 4-chlorophenol) in the IEMS without electric assistance were much lower than that in the CEMS. By adjusting the intermittent operation mode, the degradation time of 2,4-DCP was shortened greatly. Microbial characteristics in the CEMS and the IEMS were different. The correlation analysis for the main factors affecting the hydrolysis was performed by SPSS, and it was found that the correlation coefficient (rp) was -0.912 for extracellular polymeric substances (EPS) content, 0.823 for zeta potential and 0.632 for relative hydrophobicity, respectively.
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Affiliation(s)
- Zhanping Cao
- School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China.
| | - Minghui Zhang
- School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China
| | - Jingli Zhang
- School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China
| | - Hongwei Zhang
- School of Environmental and Chemical Engineering, Tianjin Polytechnic University, Tianjin 300387, China
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34
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Comparison of bacterial communities of conventional and A-stage activated sludge systems. Sci Rep 2016; 6:18786. [PMID: 26728449 PMCID: PMC4700461 DOI: 10.1038/srep18786] [Citation(s) in RCA: 53] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2015] [Accepted: 11/26/2015] [Indexed: 01/28/2023] Open
Abstract
The bacterial community structure of 10 different wastewater treatment systems and their influents has been investigated through pyrosequencing, yielding a total of 283486 reads. These bioreactors had different technological configurations: conventional activated sludge (CAS) systems and very highly loaded A-stage systems. A-stage processes are proposed as the first step in an energy producing municipal wastewater treatment process. Pyrosequencing analysis indicated that bacterial community structure of all influents was similar. Also the bacterial community of all CAS bioreactors was similar. Bacterial community structure of A-stage bioreactors showed a more case-specific pattern. A core of genera was consistently found for all influents, all CAS bioreactors and all A-stage bioreactors, respectively, showing that different geographical locations in The Netherlands and Spain did not affect the functional bacterial communities in these technologies. The ecological roles of these bacteria were discussed. Influents and A-stage bioreactors shared several core genera, while none of these were shared with CAS bioreactors communities. This difference is thought to reside in the different operational conditions of the two technologies. This study shows that bacterial community structure of CAS and A-stage bioreactors are mostly driven by solids retention time (SRT) and hydraulic retention time (HRT), as suggested by multivariate redundancy analysis.
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35
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Giatsis C, Sipkema D, Smidt H, Heilig H, Benvenuti G, Verreth J, Verdegem M. The impact of rearing environment on the development of gut microbiota in tilapia larvae. Sci Rep 2015; 5:18206. [PMID: 26658351 PMCID: PMC4676014 DOI: 10.1038/srep18206] [Citation(s) in RCA: 136] [Impact Index Per Article: 15.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/14/2015] [Accepted: 11/13/2015] [Indexed: 02/08/2023] Open
Abstract
This study explores the effect of rearing environment on water bacterial communities (BC) and the association with those present in the gut of Nile tilapia larvae (Oreochromis niloticus, Linnaeus) grown in either recirculating or active suspension systems. 454 pyrosequencing of PCR-amplified 16S rRNA gene fragments was applied to characterize the composition of water, feed and gut bacteria communities. Observed changes in water BC over time and differences in water BCs between systems were highly correlated with corresponding water physico-chemical properties. Differences in gut bacterial communities during larval development were correlated with differences in water communities between systems. The correlation of feed BC with those in the gut was minor compared to that between gut and water, reflected by the fact that 4 to 43 times more OTUs were shared between water and gut than between gut and feed BC. Shared OTUs between water and gut suggest a successful transfer of microorganisms from water into the gut, and give insight about the niche and ecological adaptability of water microorganisms inside the gut. These findings suggest that steering of gut microbial communities could be possible through water microbial management derived by the design and functionality of the rearing system.
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Affiliation(s)
- Christos Giatsis
- Aquaculture and Fisheries Group, Wageningen University, PO Box 338, 6708 WD Wageningen, the Netherlands
| | - Detmer Sipkema
- Laboratory of Microbiology, Wageningen University, Dreijenplein 10, 6703 HB Wageningen, the Netherlands
| | - Hauke Smidt
- Laboratory of Microbiology, Wageningen University, Dreijenplein 10, 6703 HB Wageningen, the Netherlands
| | - Hans Heilig
- Laboratory of Microbiology, Wageningen University, Dreijenplein 10, 6703 HB Wageningen, the Netherlands
| | - Giulia Benvenuti
- Bioprocess Engineering, AlgaePARC, Wageningen University, PO Box 16, 6700 AA Wageningen, the Netherlands
| | - Johan Verreth
- Aquaculture and Fisheries Group, Wageningen University, PO Box 338, 6708 WD Wageningen, the Netherlands
| | - Marc Verdegem
- Aquaculture and Fisheries Group, Wageningen University, PO Box 338, 6708 WD Wageningen, the Netherlands
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36
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Long B, Yang CZ, Pu WH, Yang JK, Jiang GS, Dan JF, Zhang J, Zhang L. The treatment of solvent recovery raffinate by aerobic granular sludge in a pilot-scale sequencing batch reactor. JOURNAL OF WATER AND HEALTH 2015; 13:746-757. [PMID: 26322760 DOI: 10.2166/wh.2015.247] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
Mature aerobic granular sludge (AGS) was inoculated for the start-up of a pilot-scale sequencing batch reactor for the treatment of high concentration solvent recovery raffinate (SRR). The proportion of simulated wastewater (SW) (w/w) in the influent gradually decreased to zero during the operation, while volume of SRR gradually increased from zero to 10.84 L. AGS was successfully domesticated after 48 days, which maintained its structure during the operation. The domesticated AGS was orange, irregular, smooth and compact. Sludge volume index (SVI), SV30/SV5, mixed liquor volatile suspended solids/mixed liquor suspended solids (MLVSS/MLSS), extracellular polymeric substances, proteins/polysaccharides, average particle size, granulation rate, specific oxygen utilization rates (SOUR)H and (SOUR)N of AGS were about 38 mL/g, 0.97, 0.52, 39.73 mg/g MLVSS, 1.17, 1.51 mm, 96.66%, 47.40 mg O2/h g volatile suspended solids (VSS) and 8.96 mg O2/h g VSS, respectively. Good removal effect was achieved by the reactor. Finally, the removal rates of chemical oxygen demand (COD), total inorganic nitrogen (TIN), NH4+-N and total phosphorus (TP) were more than 98%, 96%, 97% and 97%, respectively. The result indicated gradually increasing the proportion of real wastewater in influent was a useful domestication method, and the feasibility of AGS for treatment of high C/N ratio industrial wastewater.
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Affiliation(s)
- Bei Long
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China E-mail:
| | - Chang-zhu Yang
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China E-mail:
| | - Wen-hong Pu
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China E-mail:
| | - Jia-kuan Yang
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China E-mail:
| | - Guo-sheng Jiang
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China E-mail:
| | - Jing-feng Dan
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China E-mail:
| | - Jing Zhang
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China E-mail:
| | - Li Zhang
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China E-mail:
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Kim DH, Lee MK, Hwang Y, Im WT, Yun YM, Park C, Kim MS. Microbial granulation for lactic acid production. Biotechnol Bioeng 2015; 113:101-11. [DOI: 10.1002/bit.25540] [Citation(s) in RCA: 22] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/23/2014] [Revised: 12/24/2014] [Accepted: 01/05/2015] [Indexed: 11/11/2022]
Affiliation(s)
- Dong-Hoon Kim
- Department of Civil Engineering; Inha University; 100 Inharo; Nam-gu; Incheon 402-751 Republic of Korea
| | - Mo-Kwon Lee
- Biomass and Waste Energy Laboratory; Korea Institute of Energy Research; 152 Gajeong-ro Yuseong-gu Daejeon 305-343 Republic of Korea
| | - Yuhoon Hwang
- Department of Environmental Engineering; Technical University of Denmark; Miljøvej, Bygning 113, DK-2800 Kgs. Lyngby; Denmark
- Department of Civil and Environmental Engineering; Korea Advanced Institute of Science and Technology; 291 Daehak-ro, Yuseong-gu; Daejeon 305-701 Republic of Korea
| | - Wan-Taek Im
- Department of Biotechnology; Hankyoung National Univeristy; 327 Chungang-no Anseong-si; Kyonggi-do 456-749 Republic of Korea
| | - Yeo-Myeong Yun
- Department of Civil and Environmental Engineering; Korea Advanced Institute of Science and Technology; 291 Daehak-ro, Yuseong-gu; Daejeon 305-701 Republic of Korea
| | - Chul Park
- Department of Civil and Environmental Engineering; University of Massachusetts Amherst; 130 Natural Resources Road; Amherst Massachusetts 01003
| | - Mi-Sun Kim
- Biomass and Waste Energy Laboratory; Korea Institute of Energy Research; 152 Gajeong-ro Yuseong-gu Daejeon 305-343 Republic of Korea
- Division of Renewable Energy Engineering; University of Science and Technology; 217 Gajeong-ro, Yuseong-gu; Daejeon 305-350 Republic of Korea
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38
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Bourven I, Bachellerie G, Costa G, Guibaud G. Evidence of glycoproteins and sulphated proteoglycan-like presence in extracellular polymeric substance from anaerobic granular sludge. ENVIRONMENTAL TECHNOLOGY 2015; 36:2428-2435. [PMID: 25812669 DOI: 10.1080/09593330.2015.1034186] [Citation(s) in RCA: 26] [Impact Index Per Article: 2.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/04/2023]
Abstract
The protein fraction of extracellular polymeric substance (EPS) from two anaerobic granular sludge samples was characterized with sodium dodecyl sulphate-polyacrylamide gel electrophoresis (SDS-PAGE) and a far western blotting method. SDS-PAGE was used with various staining applications to obtain a protein (silver), glycoprotein [periodic acid-Shiff's (PAS)] or proteoglycan-like (Alcian blue at pH 2.5 (carboxylic group) or 1 (sulphated group)) fingerprint. The fingerprints of the EPS denatured protein from the two sludge samples differed. Some proteins are specific to Soluble (S) or Bound (B)-EPS (20-100 kDa). Denatured proteins with a polysaccharide moieties characterization are more present in B-EPS. Glycoproteins with α-d-mannosyl and/or α-d-glucosyl (90, 50, 40 kDa) were detected. Proteoglycan-like and sulphated proteoglycan-like substances are also detected, mainly in B-EPS. A 68 kDa sulphated proteoglycan-like substance contains two glucidic residue types: α-d-mannosyl and/or α-d-glucosyl and N-acetyl-β-d-glucosamine. Such heteroproteins are present around the membrane as well as the surface-layer from Archaea and from some bacteria. The glycoprotein and sulphated proteoglycan-like substance are assumed to contribute to anaerobic granule strength, thanks to their ability to perform interactions of various nature (ionic, hydrophobic, Ca(2+) as divalent cation bridging, etc.).
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Affiliation(s)
- Isabelle Bourven
- a Faculté des Sciences et Techniques , Université de Limoges, Groupement de Recherche Eau Sol Environnement (EA 4330) , 123 Av. Albert Thomas, 87060 Limoges , France
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39
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Sadri Moghaddam S, Alavi Moghaddam M. Cultivation of aerobic granules under different pre-anaerobic reaction times in sequencing batch reactors. Sep Purif Technol 2015. [DOI: 10.1016/j.seppur.2014.12.046] [Citation(s) in RCA: 8] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/24/2022]
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40
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Long B, Yang CZ, Pu WH, Yang JK, Shi YF, Wang J, Bai J, Zhou XY, Jiang GS, Li CY, Liu FB. The stability of aerobic granular sludge treating municipal sludge deep dewatering filtrate in a bench scale sequencing batch reactor. BIORESOURCE TECHNOLOGY 2014; 169:244-250. [PMID: 25058300 DOI: 10.1016/j.biortech.2014.06.094] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/21/2014] [Revised: 06/27/2014] [Accepted: 06/27/2014] [Indexed: 06/03/2023]
Abstract
Inoculated with mature aerobic granular sludge in a sequencing batch reactor, gradually increasing the proportion of municipal sludge deep dewatering filtrate in influent, aerobic granular sludge was domesticated after 84 days and maintained its structure during the operation. The domesticated AGS was yellowish-brown, dense and irregular spherical shape, average size was 1.49 mm, water content and specific density were 98.13% and 1.0114, the SVI and settling velocity were 40 ml/g and 46.5m/h. After 38 days, NO3(-)-N accumulated obviously in the reactor as lack of carbon sources. When adding 1-3g solid CH3COONa at 4.5 and 5.5h of each cycle from the 57th day, the removal rate of TN rose to above 90% after 20 days, where effective COD removal and denitrification were realized in a single bioreactor. Finally, the removal rates of COD, TP, TN and NH4(+)-N were higher than 95%, 88%, 96% and 99%.
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Affiliation(s)
- Bei Long
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China
| | - Chang-Zhu Yang
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China.
| | - Wen-Hong Pu
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China
| | - Jia-Kuan Yang
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China.
| | - Ya-Fei Shi
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China
| | - Jing Wang
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China
| | - Jun Bai
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China
| | - Xuan-Yue Zhou
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China
| | - Guo-Sheng Jiang
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China
| | - Chun-Yang Li
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China
| | - Fu-Biao Liu
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China
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41
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Gonzalez-Martinez A, Rodriguez-Sanchez A, Muñoz-Palazon B, Garcia-Ruiz MJ, Osorio F, van Loosdrecht MCM, Gonzalez-Lopez J. Microbial community analysis of a full-scale DEMON bioreactor. Bioprocess Biosyst Eng 2014; 38:499-508. [PMID: 25245398 DOI: 10.1007/s00449-014-1289-z] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.4] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/15/2014] [Accepted: 09/16/2014] [Indexed: 12/28/2022]
Abstract
Full-scale applications of autotrophic nitrogen removal technologies for the treatment of digested sludge liquor have proliferated during the last decade. Among these technologies, the aerobic/anoxic deammonification process (DEMON) is one of the major applied processes. This technology achieves nitrogen removal from wastewater through anammox metabolism inside a single bioreactor due to alternating cycles of aeration. To date, microbial community composition of full-scale DEMON bioreactors have never been reported. In this study, bacterial community structure of a full-scale DEMON bioreactor located at the Apeldoorn wastewater treatment plant was analyzed using pyrosequencing. This technique provided a higher-resolution study of the bacterial assemblage of the system compared to other techniques used in lab-scale DEMON bioreactors. Results showed that the DEMON bioreactor was a complex ecosystem where ammonium oxidizing bacteria, anammox bacteria and many other bacterial phylotypes coexist. The potential ecological role of all phylotypes found was discussed. Thus, metagenomic analysis through pyrosequencing offered new perspectives over the functioning of the DEMON bioreactor by exhaustive identification of microorganisms, which play a key role in the performance of bioreactors. In this way, pyrosequencing has been proven as a helpful tool for the in-depth investigation of the functioning of bioreactors at microbiological scale.
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42
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Wan C, Zhang Q, Lee DJ, Wang Y, Li J. Long-term storage of aerobic granules in liquid media: viable but non-culturable status. BIORESOURCE TECHNOLOGY 2014; 166:464-470. [PMID: 24950091 DOI: 10.1016/j.biortech.2014.05.091] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/06/2014] [Revised: 05/22/2014] [Accepted: 05/24/2014] [Indexed: 06/03/2023]
Abstract
Long-term storage and successful reactivation after storage are essential for practical applications of aerobic granules on wastewater treatment. This study cultivated aerobic granules (SI) in sequencing batch reactors and then stored the granules at 4 °C in five liquid media (DI water (SW), acetone (SA), acetone/isoamyl acetate mix (SAA), saline water (SS), and formaldehyde (SF)) for over 1 year. The first four granules were then successfully reactivated in 24h cultivation. The specific oxygen uptake rates (SOUR) of the granules followed SI>SS>SA>SAA>SW>SF; and the corresponding granular strengths (10 min ultrasound) followed SI>SA=SS>SAA>SW>>SF. During storage the granular cells secreted excess quantities of cyclic-diguanylate (c-di-GMP) and pentaphosphate (ppGpp) as responses to the stringent challenges. We proposed that to force cells in granules (Alphaproteobacteria, Flavobacteria, Betaproteobacteria, Gammaproteobacteria, Actinobacteria, Sphingobacteria, and Clostridia) entering viable but non-culturable (VBNC) status is the key of success for extended period storage of granules.
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Affiliation(s)
- Chunli Wan
- Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China; State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
| | - Qinlan Zhang
- Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China
| | - Duu-Jong Lee
- Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China; Department of Chemical Engineering, National Taiwan University, Taipei 106, Taiwan; Department of Chemical Engineering, National Taiwan University of Science and Technology, Taipei 106, Taiwan.
| | - Yayi Wang
- State Key Laboratory of Pollution Control and Resources Reuse, College of Environmental Science and Engineering, Tongji University, 1239 Siping Road, Shanghai 200092, China
| | - Jieni Li
- Department of Environmental Science and Engineering, Fudan University, Shanghai 200433, China
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43
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Long B, Yang CZ, Pu WH, Yang JK, Jiang GS, Dan JF, Li CY, Liu FB. Rapid cultivation of aerobic granular sludge in a pilot scale sequencing batch reactor. BIORESOURCE TECHNOLOGY 2014; 166:57-63. [PMID: 24905043 DOI: 10.1016/j.biortech.2014.05.039] [Citation(s) in RCA: 55] [Impact Index Per Article: 5.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/03/2014] [Revised: 05/05/2014] [Accepted: 05/06/2014] [Indexed: 06/03/2023]
Abstract
Aerobic granular sludge which had good performance to pollutants removal was successfully cultivated within 18 days in a pilot scale sequencing batch reactor, about 25% mature aerobic granular sludge was inoculated when the setting time of activated sludge was reduced to 10 min. Anaerobic biological selector was implemented to inhibit filamentous bacteria overgrowth, where the maximum COD could reach to 1703.74 mg/L. The cultivated aerobic granular sludge was irregular and pale yellow, average particle size, SVI, SV₃₀/SV₅, PN/PS, EPS and water content were 1.58 mm, 67.64 mL/g, 0.91, 2.17, 268.90 mg EPS/g MLVSS and 98.16% on the 18th day. Mechanism of rapid granulation mainly included crystal nucleus hypothesis and selection pressure hypothesis. The inoculated aerobic granules could maintain stable under short setting time environment, making it directly as the crystal nucleus and the carriers for new particles without obvious disintegration, which eventually shortened the granulation time greatly.
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Affiliation(s)
- Bei Long
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China
| | - Chang-zhu Yang
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China
| | - Wen-hong Pu
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China
| | - Jia-kuan Yang
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China.
| | - Guo-sheng Jiang
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China
| | - Jing-feng Dan
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China
| | - Chun-yang Li
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China
| | - Fu-biao Liu
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, China
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44
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Zhou D, Niu S, Xiong Y, Yang Y, Dong S. Microbial selection pressure is not a prerequisite for granulation: dynamic granulation and microbial community study in a complete mixing bioreactor. BIORESOURCE TECHNOLOGY 2014; 161:102-108. [PMID: 24690580 DOI: 10.1016/j.biortech.2014.03.001] [Citation(s) in RCA: 40] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2014] [Revised: 02/27/2014] [Accepted: 03/01/2014] [Indexed: 06/03/2023]
Abstract
Microbial selection pressure is traditionally supposed as a prerequisite for aerobic granulation. This work gives a different insight on this issue. Fluorescent microspheres were used to label the flocculent biomass granulation for a period of 47days in a continuous-flow bioreactor. Analysis of the distribution of fluorescent microspheres in granules revealed that the terminal phase of granulation is in a dynamic steady state, where bioflocs detach, collide and aggregate randomly. This revealed that the un-granulated biomass was the result of the dynamic aggregation and breakage, rather than the microbial species unable to be granulated. Furthermore, denaturing gradient gel electrophoresis (DGGE) profile and UPGMA dendrogram results showed similar microbial communities during the granulation. To sum up, microbial selection pressure was not a prerequisite for aerobic granulation from both of the dynamic granulation steps and molecular biology aspects.
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Affiliation(s)
- Dandan Zhou
- Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China
| | - Shu Niu
- Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China
| | - Yongjiao Xiong
- Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China
| | - Yang Yang
- Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China
| | - Shuangshi Dong
- Key Lab of Groundwater Resources and Environment, Ministry of Education, Jilin University, Changchun 130021, China.
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45
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Enhanced aerobic granulation, stabilization, and nitrification in a continuous-flow bioreactor by inoculating biofilms. Appl Microbiol Biotechnol 2014; 98:5737-45. [DOI: 10.1007/s00253-014-5637-3] [Citation(s) in RCA: 14] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2013] [Revised: 02/19/2014] [Accepted: 02/22/2014] [Indexed: 11/25/2022]
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46
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Chao Y, Guo F, Fang HH, Zhang T. Hydrophobicity of diverse bacterial populations in activated sludge and biofilm revealed by microbial adhesion to hydrocarbons assay and high-throughput sequencing. Colloids Surf B Biointerfaces 2014; 114:379-85. [DOI: 10.1016/j.colsurfb.2013.10.028] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2013] [Revised: 10/17/2013] [Accepted: 10/21/2013] [Indexed: 12/01/2022]
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47
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Lv J, Wang Y, Zhong C, Li Y, Hao W, Zhu J. The microbial attachment potential and quorum sensing measurement of aerobic granular activated sludge and flocculent activated sludge. BIORESOURCE TECHNOLOGY 2014; 151:291-296. [PMID: 24262838 DOI: 10.1016/j.biortech.2013.10.013] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/02/2013] [Revised: 10/01/2013] [Accepted: 10/05/2013] [Indexed: 06/02/2023]
Abstract
The aerobic granulation process is involved in the attachment of microorganisms, and the quorum sensing (QS) is supposed to play an important role in microbial attachment. In this study, the attachment potential of aerobic granular activated sludge (AGAS) and flocculent activated sludge (FAS) was investigated. Results clearly showed that AGAS had stronger attachment potential than FAS. A bioassay with NTL4 proved that N-acylhomoserine lactones (AHLs) were produced in both sludge, but the AHLs content of AGAS was significantly higher than FAS. Additionally, the extracellular polymeric substances (EPS) measurements indicated that there were more proteins and polysaccharides in the hydrophobic EPS fraction of AGAS. Besides, the bacterial community structure of AGAS differed from FAS by PCR-DGGE. Some hydrophobic bacteria, such as Flavobacterium, exclusively existed in AGAS. It was speculated that the difference of attachment potential between AGAS and FAS was derived from the divergence of AHLs, EPS and microbial community.
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Affiliation(s)
- Junping Lv
- School of Environment, Beijing Normal University, Beijing 100875, China
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48
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Zhu L, Lv ML, Dai X, Zhou JH, Xu XY. The stability of aerobic granular sludge under 4-chloroaniline shock in a sequential air-lift bioreactor (SABR). BIORESOURCE TECHNOLOGY 2013; 140:126-130. [PMID: 23685649 DOI: 10.1016/j.biortech.2013.04.017] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/13/2012] [Revised: 04/03/2013] [Accepted: 04/05/2013] [Indexed: 06/02/2023]
Abstract
The aerobic granular sludge technology has a great potential in treatment of municipal wastewater and industrial wastewater containing toxic non-degradable pollutants. However, the formation and structural stability of aerobic granular sludge is susceptible to toxic shock. In the study, the effect of 4-chloroaniline (4-ClA) as a common toxic pollutant on the granular structure and performance was investigated, and the mechanism was revealed to provide more information on 4-ClA degradation with aerobic granular sludge process. The results showed that a 4-ClA shock at influent 200 mg L(-1) could cause the disintegration of aerobic granular sludge and decrease of the pollutant removal performance. The analysis of extracellular polymeric substances (EPS) within the mature and disintegrated granular sludge showed that the decrease of protein content in EPS, especially the components like Amide I 3-turn helix and β-sheet structures and aspartate, was not good for the stability of aerobic granular sludge. The microbial community results demonstrated that the disappearance of dominant bacteria like Kineosphaera limosa or appearance like Acinetobacter, might contribute to the reduction of EPS and disintegration of aerobic granular sludge.
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Affiliation(s)
- Liang Zhu
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China.
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49
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Antibiofilm activity of Bacillus pumilus SW9 against initial biofouling on microfiltration membranes. Appl Microbiol Biotechnol 2013; 98:1309-20. [DOI: 10.1007/s00253-013-4991-x] [Citation(s) in RCA: 7] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/28/2013] [Revised: 05/06/2013] [Accepted: 05/10/2013] [Indexed: 02/05/2023]
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50
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Abstract
Based on grey entropy analysis, the relational grade of operational parameters with aerobic granular sludge's granulation indicators was studied. The former consisted of settling time (ST), aeration time (AT), superficial gas velocity (SGV), height/diameter (H/D) ratio and organic loading rates (OLR), the latter included sludge volume index (SVI) and set-up time. The calculated result showed that for SVI and set-up time, the influence orders and the corresponding grey entropy relational grades (GERG) were: SGV (0.9935) > AT (0.9921) > OLR (0.9894) > ST (0.9876) > H/D (0.9857) and SGV (0.9928) > H/D (0.9914) > AT (0.9909) > OLR (0.9897) > ST (0.9878). The chosen parameters were all key impact factors as each GERG was larger than 0.98. SGV played an important role in improving SVI transformation and facilitating the set-up process. The influence of ST on SVI and set-up time was relatively low due to its dual functions. SVI transformation and rapid set-up demanded different optimal H/D ratio scopes (10-20 and 16-20). Meanwhile, different functions could be obtained through adjusting certain factors' scope.
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Affiliation(s)
- Cuiya Zhang
- Key Laboratory of Industrial Ecology and Environmental Engineering, School of Environmental Science and Technology, Dalian University of Technology, Dalian 116024, China.
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