201
|
Noszczyńska M, Piotrowska-Seget Z. Bisphenols: Application, occurrence, safety, and biodegradation mediated by bacterial communities in wastewater treatment plants and rivers. CHEMOSPHERE 2018; 201:214-223. [PMID: 29524822 DOI: 10.1016/j.chemosphere.2018.02.179] [Citation(s) in RCA: 93] [Impact Index Per Article: 15.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/02/2017] [Revised: 02/06/2018] [Accepted: 02/28/2018] [Indexed: 05/20/2023]
Abstract
Numerous data indicate that most of bisphenols (BPs) are endocrine disrupters and exhibit cytotoxicity, neurotoxicity, genotoxicity and reproductive toxicity against vertebrates. Nevertheless, they are widely applied in material production what result in their ubiquitous occurrence in ecosystems. While BPA is the most frequently detected in environment, BPAF, BPF and BPS are also often found. Ecosystem particularly exposed to BPs pollution is industrial and municipal wastewater being a common source of BPA in river waters. Different techniques to remove BPs from these ecosystems have been applied, among which biodegradation seems to be the most effective. In this review the current state of knowledge in the field of BPs application, distribution in the environment, effects on animal and human health, and biodegradation mediated by bacterial populations in wastewater treatment plants and rivers is presented.
Collapse
Affiliation(s)
- Magdalena Noszczyńska
- Department of Microbiology, University of Silesia, Jagiellońska 28, 40-032 Katowice, Poland.
| | - Zofia Piotrowska-Seget
- Department of Microbiology, University of Silesia, Jagiellońska 28, 40-032 Katowice, Poland.
| |
Collapse
|
202
|
Chai L, Li Q, Wang Q, Yan X. Solid-liquid separation: an emerging issue in heavy metal wastewater treatment. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2018; 25:17250-17267. [PMID: 29766423 DOI: 10.1007/s11356-018-2135-7] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/20/2018] [Accepted: 04/25/2018] [Indexed: 06/08/2023]
Abstract
Solid-liquid separation (SLS) plays a dominant role in various chemical industries. Nowadays, low efficiency of SLS also become a significant problem in heavy metal (HM) wastewater treatment, affecting the effluent quality (HM concentration and turbidity) and overall process economy. In this context, we summarize here the occurrence of solids in HM wastewater, as well as typical SLS operations used in HM wastewater treatment, including sedimentation, flotation, and centrifugation. More important, this article reviews the improvement of the SLS operations by some technologies, including coagulation, flocculation, ballasted method, seeding method, granular sludge strategy, and external field enhancement. It is noted that abiological granular sludge strategy and magnetic field enhancement often possess higher SLS efficiency (faster settling velocity or shorter separation time) than other methods. Hence, the two strategies stand out as promising tools for improving SLS in HM wastewater treatment, but further research is required regarding scalability, economy, and reliability.
Collapse
Affiliation(s)
- Liyuan Chai
- School of Metallurgy and Environment, Central South University, Changsha, 410083, Hunan, China
- National Engineering Research Center for Heavy Metals Pollution Control and Treatment, Changsha, China
| | - Qingzhu Li
- School of Metallurgy and Environment, Central South University, Changsha, 410083, Hunan, China
- National Engineering Research Center for Heavy Metals Pollution Control and Treatment, Changsha, China
| | - Qingwei Wang
- School of Metallurgy and Environment, Central South University, Changsha, 410083, Hunan, China
- National Engineering Research Center for Heavy Metals Pollution Control and Treatment, Changsha, China
| | - Xu Yan
- School of Metallurgy and Environment, Central South University, Changsha, 410083, Hunan, China.
- National Engineering Research Center for Heavy Metals Pollution Control and Treatment, Changsha, China.
| |
Collapse
|
203
|
|
204
|
Liu X, Wu S, Zhang D, Shen J, Han W, Sun X, Li J, Wang L. Simultaneous pyridine biodegradation and nitrogen removal in an aerobic granular system. J Environ Sci (China) 2018; 67:318-329. [PMID: 29778165 DOI: 10.1016/j.jes.2017.09.016] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/22/2017] [Revised: 09/30/2017] [Accepted: 09/30/2017] [Indexed: 06/08/2023]
Abstract
Simultaneous pyridine biodegradation and nitrogen removal were successfully achieved in a sequencing batch reactor (SBR) based on aerobic granules. In a typical SBR cycle, nitritation occurred obviously after the majority of pyridine was removed, while denitrification occurred at early stage of the cycle when oxygen consumption was aggravated. The effect of several key operation parameters, i.e., air flow rate, influent NH4+-N concentration, influent pH and pyridine concentration, on nitritation, pyridine degradation and total nitrogen (TN) removal, was systematically investigated. The results indicated that high air flow rate had a positive effect on both pyridine degradation and nitritation but a negative impact of overhigh air flow rate. With the increase of NH4+ dosage, both nitritation and TN removal could be severely inhibited. Slightly alkaline condition, i.e., pH7.0-8.0, was beneficial for both pyridine degradation and nitritation. High pyridine dosage often resulted in the delay of both pyridine degradation and nitritation. Besides, extracellular polymeric substances production was affected by air flow rate, NH4+ dosage, pyridine dosage and pH. In addition, high-throughput sequencing analysis demonstrated that Bdellovibrio and Paracoccus were the dominant species in the aerobic granulation system. Coexistence of pyridine degrader, nitrification related species, denitrification related species, polymeric substances producer and self-aggregation related species was also confirmed by high-throughput sequencing.
Collapse
Affiliation(s)
- Xiaodong Liu
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Shijing Wu
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Dejin Zhang
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Jinyou Shen
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
| | - Weiqing Han
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Xiuyun Sun
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Jiansheng Li
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China
| | - Lianjun Wang
- Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing 210094, China.
| |
Collapse
|
205
|
Liu S, Zhan H, Xie Y, Shi W, Wang S. Rapid cultivation of aerobic granular sludge by xanthan gum in SBR reactors. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2018; 2017:360-369. [PMID: 29851388 DOI: 10.2166/wst.2018.151] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
This study focuses on the effect of xanthan gum on aerobic sludge granulation, through close monitoring of the physical and chemical changes of the aerobic granular sludge, and treatment performance. Two sequencing batch reactors (SBRs), R1 and R2, were seeded with activated sludge only (R1) and with a mixture of activated sludge and 40 mg/L of xanthan gum (R2). The results showed that granulation finished on the 20th day in R2, far faster than the granulation time of 30 days in R1. Meanwhile, there was a reliably higher sludge concentration, better settling properties and better particle mechanical strength in R2, and better removal performance of total nitrogen (TN) and chemical oxygen demand (COD). The results demonstrated that seeding xanthan gum enhanced the aerobic sludge granulation in the SBR. Maybe its anionic and hydrophilic surface characteristics facilitate interactions with cations and other polysaccharides, inducing stronger gelation, which promoted the formation of particles or increased the internal relationship between particles, thereby increasing the cohesion within the sludge, so that the granular sludge was not easily broken.
Collapse
Affiliation(s)
- Sha Liu
- School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, China E-mail:
| | - Hanhui Zhan
- School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, China E-mail:
| | - Yaqi Xie
- School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, China E-mail:
| | - Weijiang Shi
- School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, China E-mail:
| | - Siming Wang
- School of Environment Science and Spatial Informatics, China University of Mining and Technology, Xuzhou, China E-mail:
| |
Collapse
|
206
|
Yuan S, Gao M, Ma H, Afzal MZ, Wang YK, Wang M, Xu H, Wang SG, Wang XH. Qualitatively and quantitatively assessing the aggregation ability of sludge during aerobic granulation process combined XDLVO theory with physicochemical properties. J Environ Sci (China) 2018; 67:154-160. [PMID: 29778148 DOI: 10.1016/j.jes.2017.08.015] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Revised: 08/21/2017] [Accepted: 08/21/2017] [Indexed: 06/08/2023]
Abstract
Inexact mechanism of aerobic granulation still impedes optimization and application of aerobic granules. In this study, the extended Derjaguin, Landau, Verwey, and Overbeek (XDLVO) theory and physicochemical properties were combined to assess the aggregation ability of sludge during aerobic granulation process qualitatively and quantitatively. Results show that relative hydrophobicity of sludge and polysaccharide content of extracellular polymeric substances (EPS) increased, while electronegativity of sludge decreased during acclimation phase. After 20days' acclimation, small granules began to form due to high aggregation ability of sludge. Since then, coexisted flocs and granules possessed distinct physicochemical properties during granulation and maturation phase. The relative hydrophobicity decreased while electronegativity increased for flocs, whereas that for granules presented reverse trend. Through analyzing the interaction energy using the XDLVO theory, small granules tended to self-grow rather than self-aggregate or attach of flocs due to poor aggregation ability between flocs and granules during the granulation phase. Besides, remaining flocs were unlikely to self-aggregate owing to poor aggregation ability, low hydrophobicity and high electronegativity.
Collapse
Affiliation(s)
- Shasha Yuan
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China
| | - Mingming Gao
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China
| | - Hui Ma
- Beijing Municipal Commission of Urban Planning Tongzhou District Branch, Beijing 101101, China
| | - Muhammad Zaheer Afzal
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China
| | - Yun-Kun Wang
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China
| | - Mingyu Wang
- State Key Laboratory of Microbial Technology, School of Life Sciences, Shandong University, Jinan 250100, China
| | - Hai Xu
- State Key Laboratory of Microbial Technology, School of Life Sciences, Shandong University, Jinan 250100, China
| | - Shu-Guang Wang
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China
| | - Xin-Hua Wang
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, Jinan 250100, China.
| |
Collapse
|
207
|
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.
Collapse
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
| |
Collapse
|
208
|
The role of extracellular polymeric substances on aerobic granulation with stepwise increase of salinity. Sep Purif Technol 2018. [DOI: 10.1016/j.seppur.2017.11.074] [Citation(s) in RCA: 46] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/20/2022]
|
209
|
Xia J, Ye L, Ren H, Zhang XX. Microbial community structure and function in aerobic granular sludge. Appl Microbiol Biotechnol 2018; 102:3967-3979. [PMID: 29550989 DOI: 10.1007/s00253-018-8905-9] [Citation(s) in RCA: 77] [Impact Index Per Article: 12.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/08/2017] [Revised: 02/22/2018] [Accepted: 02/26/2018] [Indexed: 12/28/2022]
Abstract
Aerobic granular sludge (AGS), a self-immobilized microbial consortium containing different functional microorganisms, is receiving growing attention, since it has shown great technological and economical potentials in the field of wastewater treatment. Microbial community is crucial for the formation, stability, and pollutant removal efficiency of aerobic granules. This mini-review systematically summarizes the recent findings of the microbial community structure and function of AGS and discusses the new research progress in the microbial community dynamics during the granulation process and spatial distribution patterns of the microbiota in AGS. The presented information may be helpful for the in-depth theoretical study and practical application of AGS technology in the future.
Collapse
Affiliation(s)
- Juntao Xia
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Avenue, Nanjing, 210023, China
| | - Lin Ye
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Avenue, Nanjing, 210023, China.
| | - Hongqiang Ren
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Avenue, Nanjing, 210023, China
| | - Xu-Xiang Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Avenue, Nanjing, 210023, China.
| |
Collapse
|
210
|
Dong H, Wei D, Wei J, Han F, Yan T, Khan MS, Du B, Wei Q. Qualitative and quantitative spectrometric evaluation of soluble microbial products formation in aerobic granular sludge system treating nitrate wastewater. Bioprocess Biosyst Eng 2018. [PMID: 29523965 DOI: 10.1007/s00449-018-1918-z] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
In present study, the characteristics of soluble microbial products (SMP) were evaluated in aerobic granular sludge system during denitrification process under different chemical oxygen demand/nitrogen (C/N) ratios. Batch experiment showed that the effluent nitrate (NO3--N) concentration were 15.24 ± 1.83 and 1.72 ± 1.53 mg/L at C/N ratio of 1 and 6, respectively. For the release of SMP, the protein (PN) and polysaccharide contents increased from 1.23 ± 0.38 and 7.46 ± 1.13 mg/L to 1.80 ± 0.76 and 10.53 ± 1.24 mg/L with increasing C/N ratios, respectively. Excitation-emission matrix identified four peaks in SMP, including aromatic PN-like, tryptophan PN-like, fulvic acid-like and humic acid-like substances. Fluorescence regional integration suggested that biodegradable PN-like substances occupied the percentage between 53.0 and 61.7% in SMP. Synchronous fluorescence spectra coupled with two-dimensional correlation spectroscopy indicated that the release of SMP fractions in the early stage (0-150 min) changed in the following sequences: PN-like fraction > fulvic acid-like fraction.
Collapse
Affiliation(s)
- Heng Dong
- School of Resources and Environment, University of Jinan, Jinan, 250022, People's Republic of China
| | - Dong Wei
- School of Resources and Environment, University of Jinan, Jinan, 250022, People's Republic of China.
| | - Jinglin Wei
- School of Resources and Environment, University of Jinan, Jinan, 250022, People's Republic of China
| | - Fei Han
- School of Resources and Environment, University of Jinan, Jinan, 250022, People's Republic of China
| | - Tao Yan
- School of Resources and Environment, University of Jinan, Jinan, 250022, People's Republic of China
| | - Malik Saddam Khan
- Key Laboratory of Interfacial Reaction and Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, People's Republic of China
| | - Bin Du
- School of Resources and Environment, University of Jinan, Jinan, 250022, People's Republic of China.
| | - Qin Wei
- Key Laboratory of Interfacial Reaction and Sensing Analysis in Universities of Shandong, School of Chemistry and Chemical Engineering, University of Jinan, Jinan, 250022, People's Republic of China
| |
Collapse
|
211
|
Wu D, Zhang Z, Yu Z, Zhu L. Optimization of F/M ratio for stability of aerobic granular process via quantitative sludge discharge. BIORESOURCE TECHNOLOGY 2018; 252:150-156. [PMID: 29316501 DOI: 10.1016/j.biortech.2017.12.094] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/13/2017] [Revised: 12/26/2017] [Accepted: 12/27/2017] [Indexed: 06/07/2023]
Abstract
Food to microorganisms (F/M) ratio is one of the most important factors affecting microbial growth and pollutant removal in biological wastewater treatment system. For stability of aerobic granular process, optimal range of F/M ratio and a maneuverable F/M ratio control method via quantitative sludge discharge were investigated in this study. Results showed that stable aerobic granules were achieved with good settleability, high pollutant removal efficiency and microbial diversity when F/M ratio was controlled at 0.4-0.5 gCOD/gSS d. In addition, a maneuverable F/M ratio control method via quantitative sludge discharge was developed to verify the feasibility for optimization of F/M ratio. By this method, aerobic granules cultivated with the F/M ratio of 0.4 ± 0.02 gCOD/gSS d had better pollutant removal performance and stable structure with higher protein-like components in EPS. This study further revealed the importance of F/M ratio in the stability of aerobic granular sludge process.
Collapse
Affiliation(s)
- Di Wu
- Institute of Environment Pollution Control and Treatment, Zhejiang University, Hangzhou 310058, China
| | - Zhiming Zhang
- Institute of Environment Pollution Control and Treatment, Zhejiang University, Hangzhou 310058, China
| | - Zhuodong Yu
- Institute of Environment Pollution Control and Treatment, Zhejiang University, Hangzhou 310058, China
| | - Liang Zhu
- Institute of Environment Pollution Control and Treatment, Zhejiang University, Hangzhou 310058, China; Zhejiang Province Key Laboratory for Water Pollution Control and Environmental Safety, Hangzhou 310058, China.
| |
Collapse
|
212
|
Fan XY, Gao JF, Pan KL, Li DC, Zhang LF, Wang SJ. Shifts in bacterial community composition and abundance of nitrifiers during aerobic granulation in two nitrifying sequencing batch reactors. BIORESOURCE TECHNOLOGY 2018; 251:99-107. [PMID: 29272774 DOI: 10.1016/j.biortech.2017.12.038] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2017] [Revised: 12/12/2017] [Accepted: 12/13/2017] [Indexed: 06/07/2023]
Abstract
Shifts in bacterial community composition and abundance of nitrifiers during aerobic granulation, and the effects of wastewater composition on them were investigated using Illumina sequencing and quantitative PCR. The bacterial diversity decreased sharply during the post-granulation period. Although cultivated with different wastewater types, aerobic granular sludge (AGS) formed with similar bacterial structure. The bacterial structure in AGS was completely different from that of seed sludge. The minor genera in seed sludge, e.g., Arcobacter, Aeromonas, Flavobacterium and Acinetobacter, became the dominant genera in AGS. These genera have the potential to secrete excess extracellular polymer substances. Whereas, the dominant genera in seed sludge were found in less amount or even disappeared in AGS. During aerobic granulation, ammonia-oxidizing archaea were gradually washed-out. While, ammonia-oxidizing bacteria, complete ammonia oxidizers and nitrite-oxidizing bacteria were retained. Overall, in this study, the bacterial genera with low relative abundance in seed sludge are important for aerobic granulation.
Collapse
Affiliation(s)
- Xiao-Yan Fan
- 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.
| | - Kai-Ling Pan
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
| | - Ding-Chang Li
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
| | - Li-Fang Zhang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
| | - Shi-Jie Wang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Beijing University of Technology, Beijing 100124, China
| |
Collapse
|
213
|
State of the art on granular sludge by using bibliometric analysis. Appl Microbiol Biotechnol 2018; 102:3453-3473. [PMID: 29497798 DOI: 10.1007/s00253-018-8844-5] [Citation(s) in RCA: 12] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2017] [Revised: 02/02/2018] [Accepted: 02/05/2018] [Indexed: 02/07/2023]
Abstract
With rapid industrialization and urbanization in the nineteenth century, the activated sludge process (ASP) has experienced significant steps forward in the face of greater awareness of and sensitivity toward water-related environmental problems. Compared with conventional flocculent ASP, the major advantages of granular sludge are characterized by space saving and resource recovery, where the methane and hydrogen recovery in anaerobic granular and 50% more space saving, 30-50% of energy consumption reduction, 75% of footprint cutting, and even alginate recovery in aerobic granular. Numerous engineers and scientists have made great efforts to explore the superiority over the last 40 years. Therefore, a bibliometric analysis was desired to trace the global trends of granular sludge research from 1992 to 2016 indexed in the SCI-EXPANDED. Articles were published in 276 journals across 44 subject categories spanning 1420 institutes across 68 countries. Bioresource Technology (293, 11.9%), Water Research (235, 9.6%), and Applied Microbiology and Biotechnology (127, 5.2%) dominated in top three journals. The Engineering (991, 40.3%), China (906, 36.9%), and Harbin Inst Technol, China (114, 4.6%) were the most productive subject category, country, and institution, respectively. The hotspot is the emerging techniques depended on granular reactors in response to the desired removal requirements and bio-energy production (primarily in anaerobic granular sludge). In view of advanced and novel bio-analytical methods, the characteristics, functions, and mechanisms for microbial granular were further revealed in improving and innovating the granulation techniques. Therefore, a promising technique armed with strengthened treatment efficiency and efficient resource and bio-energy recovery can be achieved.
Collapse
|
214
|
Liébana R, Modin O, Persson F, Wilén BM. Integration of aerobic granular sludge and membrane bioreactors for wastewater treatment. Crit Rev Biotechnol 2018; 38:801-816. [PMID: 29400086 DOI: 10.1080/07388551.2017.1414140] [Citation(s) in RCA: 17] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Environmental deterioration together with the need for water reuse and the increasingly restrictive legislation of water quality standards have led to a demand for compact, efficient and less energy consuming technologies for wastewater treatment. Aerobic granular sludge and membrane bioreactors (MBRs) are two technologies with several advantages, such as small footprint, high-microbial density and activity, ability to operate at high organic- and nitrogen-loading rates, and tolerance to toxicity. However, they also have some disadvantages. The aerobic granular sludge process generally requires post-treatment in order to fulfill effluent standards and MBRs suffer from fouling of the membranes. Integrating the two technologies could be a way of combining the advantages and addressing the main problems associated with both processes. The use of membranes to separate the aerobic granules from the treated water would ensure high-quality effluents suitable for reuse. Moreover, the use of granular sludge in MBRs has been shown to reduce fouling. Several recent studies have shown that the aerobic granular membrane bioreactor (AGMBR) is a promising hybrid process with many attractive features. However, major challenges that have to be addressed include how to achieve granulation and maintain granular stability during continuous operation of reactors. This paper aims to review the current state of research on AGMBR technology while drawing attention to relevant findings and highlight current limitations.
Collapse
Affiliation(s)
- Raquel Liébana
- a Division of Water Environment Technology, Department of Architecture and Civil Engineering , Chalmers University of Technology , Gothenburg , Sweden
| | - Oskar Modin
- a Division of Water Environment Technology, Department of Architecture and Civil Engineering , Chalmers University of Technology , Gothenburg , Sweden
| | - Frank Persson
- a Division of Water Environment Technology, Department of Architecture and Civil Engineering , Chalmers University of Technology , Gothenburg , Sweden
| | - Britt-Marie Wilén
- a Division of Water Environment Technology, Department of Architecture and Civil Engineering , Chalmers University of Technology , Gothenburg , Sweden
| |
Collapse
|
215
|
Ou D, Li H, Li W, Wu X, Wang YQ, Liu YD. Salt-tolerance aerobic granular sludge: Formation and microbial community characteristics. BIORESOURCE TECHNOLOGY 2018; 249:132-138. [PMID: 29040846 DOI: 10.1016/j.biortech.2017.07.154] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/16/2017] [Revised: 07/24/2017] [Accepted: 07/26/2017] [Indexed: 06/07/2023]
Abstract
The salt-tolerance aerobic granular sludge (SAGS) dominated by moderately halophilic bacteria was successfully cultured in a 9% (w/v) salty, lab-scale sequence batch reactor (SBR) system. Influence of high salinity (0-9% w/v NaCl) on the formation, performance and microbial succession of the SAGS were explored. Crystal nucleus hypothesis, selection pressure hypothesis and compressed double electric layers hypothesis were used to discuss the formation mechanism of SAGS. Notably, salinity could be seen as a kind of selection pressure contributed to the formation of SAGS, while salinity also declined the performance of SAGS system. High throughput 16S rRNA gene analysis showed that the salinity had great influence on the species succession and community structure of SAGS. Moreover, Salinicola and Halomonas were dominant at 9% salt concentration, therefore moderate halophiles were identified as functional groups for the tolerance of hypersaline stress.
Collapse
Affiliation(s)
- Dong Ou
- 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, PR China
| | - Hui Li
- 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, PR China
| | - Wei Li
- Department of Environmental Engineering, College of Environmental and Resource Science, Zhejiang University, Hangzhou 310058, PR China
| | - Xiao Wu
- 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, PR China
| | - Yi-Qiao Wang
- 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, PR China
| | - Yong-di Liu
- 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, PR China.
| |
Collapse
|
216
|
Gómez-Acata S, Vital-Jácome M, Pérez-Sandoval MV, Navarro-Noya YE, Thalasso F, Luna-Guido M, Conde-Barajas E, Dendooven L. Microbial community structure in aerobic and fluffy granules formed in a sequencing batch reactor supplied with 4-chlorophenol at different settling times. JOURNAL OF HAZARDOUS MATERIALS 2018; 342:606-616. [PMID: 28898858 DOI: 10.1016/j.jhazmat.2017.08.073] [Citation(s) in RCA: 32] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/31/2017] [Revised: 08/23/2017] [Accepted: 08/24/2017] [Indexed: 06/07/2023]
Abstract
Toxic compounds, such as 4-chlorophenol (4-CP), which is a common pollutant in wastewater, are removed efficiently from sequencing batch reactors (SBRs) by microorganisms. The bacterial community in aerobic granules formed during the removal of 4-CP in a SBR was monitored for 63days. The SBR reactor was operated with a constant filling and withdrawal time of 7 and 8min and decreasing settling time (30, 5, 3 and 2min) to induce the formation of aerobic granules. During the acclimation period lasting 15days (30min settling time) had a strong effect on the bacterial community. From day 18 onwards, Sphingobium and Comamonadaceae were detected. Rhizobiaceae were dominant from day 24 to day 28 when stable aerobic granules were formed. At day 35, fluffy granules were formed, but the bacterial community structure did not change, despite the changes in the reactor operation to inhibit filamentous bacteria growth. This is the first report on changes in the bacterial community structure of aerobic and fluffy granules during granulation process in a reactor fed with 4-CP and the prediction of its metabolic pathways.
Collapse
Affiliation(s)
- Selene Gómez-Acata
- Department of Environmental Engineering, Instituto Tecnológico de Celaya, Guanajuato, Mexico
| | | | | | | | | | - Marco Luna-Guido
- Laboratory of Soil Ecology, ABACUS, Cinvestav, México, D.F., Mexico
| | - Eloy Conde-Barajas
- Department of Environmental Engineering, Instituto Tecnológico de Celaya, Guanajuato, Mexico
| | - Luc Dendooven
- Laboratory of Soil Ecology, ABACUS, Cinvestav, México, D.F., Mexico.
| |
Collapse
|
217
|
Amorim CL, Alves M, Castro PML, Henriques I. Bacterial community dynamics within an aerobic granular sludge reactor treating wastewater loaded with pharmaceuticals. ECOTOXICOLOGY AND ENVIRONMENTAL SAFETY 2018; 147:905-912. [PMID: 28968945 DOI: 10.1016/j.ecoenv.2017.09.060] [Citation(s) in RCA: 26] [Impact Index Per Article: 4.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2017] [Revised: 09/18/2017] [Accepted: 09/20/2017] [Indexed: 06/07/2023]
Abstract
Pharmaceuticals are micropollutants often present in wastewater treatment systems. In this study, the potential impact of such micropollutants on the bacterial population within aerobic granular sludge (AGS) bioreactor was investigated. The AGS bacterial community structure and composition were accessed combining DGGE fingerprinting and barcoded pyrosequencing analysis. Both revealed the existence of a dynamic bacterial community, independently of the pharmaceuticals presence. The AGS microbiome at both phylum and class levels varied over time and, after stopping pharmaceuticals feeding, the bacterial community did not return to its initial composition. Nevertheless, most of the assigned OTUs were present throughout the different operational phases. This core microbiome, represented by over 72% of the total sequences in each phase, probably played an important role in biological removal processes, avoiding their failure during the disturbance period. Quantitative-PCR revealed that pharmaceuticals load led to gradual changes on the abundance of ammonia-oxidizing bacteria (AOB), nitrite-oxidizing bacteria (NOB) and polyphosphate-accumulating organisms (PAO) but their persistence during that phase demonstrated the resilience of such bacterial groups. AGS microbiome changed over time but a core community was maintained, probably ensuring the accomplishment of the main biological removal processes.
Collapse
Affiliation(s)
- Catarina L Amorim
- Biology Department and CESAM, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal; Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina, Laboratório Associado, Escola Superior de Biotecnologia, Rua Arquiteto Lobão Vital 172, 4200-374 Porto, Portugal.
| | - Marta Alves
- Biology Department and CESAM, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
| | - Paula M L Castro
- Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina, Laboratório Associado, Escola Superior de Biotecnologia, Rua Arquiteto Lobão Vital 172, 4200-374 Porto, Portugal.
| | - Isabel Henriques
- Biology Department and CESAM, University of Aveiro, Campus Universitário de Santiago, 3810-193 Aveiro, Portugal.
| |
Collapse
|
218
|
Franca RD, Pinheiro HM, van Loosdrecht MC, Lourenço ND. Stability of aerobic granules during long-term bioreactor operation. Biotechnol Adv 2018; 36:228-246. [DOI: 10.1016/j.biotechadv.2017.11.005] [Citation(s) in RCA: 125] [Impact Index Per Article: 20.8] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/31/2017] [Revised: 09/30/2017] [Accepted: 11/14/2017] [Indexed: 10/18/2022]
|
219
|
Qian J, Wei L, Wu Y, Wang Q, Fu X, Zhang X, Chang X, Wang L, Pei X. A comparative study on denitrifying sludge granulation with different electron donors: Sulfide, thiosulfate and organics. CHEMOSPHERE 2017; 186:322-330. [PMID: 28797950 DOI: 10.1016/j.chemosphere.2017.07.106] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/18/2017] [Revised: 07/18/2017] [Accepted: 07/18/2017] [Indexed: 06/07/2023]
Abstract
A comparative study on denitrifying sludge granulation with different electron donors (sulfide, thiosulfate and organics) was carried out. Longer time was spent on sulfide-denitrifying granular sludge (DGS) cultivation (88 days) than thiosulfate- and organics-DGS cultivations (57 days). All the three DGS were characterized in terms of particle size distribution, sludge settling ability (indicated by sludge volume index and settling velocity), permeability (indicated by fractal dimension) and extracellular polymeric substances (EPS, including polysaccharide and protein) secretion. Sludge productions in the three DGS-reactors were also monitored. The key functional microorganisms in three granular reactors were revealed via high through-put pyrosequencing analysis. Batch tests were performed to measure the denitrification activities of each DGS, including both denitratation (NO3- → NO2-) and denitritation (NO2- → N2). We found that thiosulfate-driven denitrifying sludge granulation (TDDSG) should be the most efficient and compact technology for effective BNR in municipal wastewater treatment. The findings of this study suggests the TDDSG could further increase the nitrogen removal potential in an enhanced sulfur cycle-driven bioprocess for co-treatment of wet flue gas desulfurization wastes with fresh sewage depending on three short-cut biological reactions, including: 1) short-cut biological sulfur reduction (SO42-/SO32- → S2O32-); 2) thiosulfate-driven denitritation (S2O32- + NO2- → SO42- + N2↑); and 3) nitritation (NH4+ + O2 → NO2-).
Collapse
Affiliation(s)
- Jin Qian
- Department of Applied Chemistry, School of Natural and Applied Sciences, Research & Development Institute in Shenzhen, Northwestern Polytechnical University, China; State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China; State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, 610059, China.
| | - Li Wei
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin, 150090, China
| | - Yaoguo Wu
- Department of Applied Chemistry, School of Natural and Applied Sciences, Research & Development Institute in Shenzhen, Northwestern Polytechnical University, China
| | - Qilin Wang
- Griffith School of Engineering, Griffith University, Nathan Campus, QLD, 4111, Australia; Centre for Clean Environment and Energy, Griffith University, Gold Coast Campus, QLD, 4222, Australia
| | - Xiaoying Fu
- State Key Laboratory of Hydraulics and Mountain River Engineering, Sichuan University, Chengdu, 610065, China
| | - Xiaochao Zhang
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, 610059, China
| | - Xing Chang
- Department of Applied Chemistry, School of Natural and Applied Sciences, Research & Development Institute in Shenzhen, Northwestern Polytechnical University, China
| | - Lianlian Wang
- Department of Applied Chemistry, School of Natural and Applied Sciences, Research & Development Institute in Shenzhen, Northwestern Polytechnical University, China
| | - Xiangjun Pei
- State Key Laboratory of Geohazard Prevention and Geoenvironment Protection, Chengdu University of Technology, Chengdu, 610059, China.
| |
Collapse
|
220
|
Crovadore J, Soljan V, Calmin G, Chablais R, Cochard B, Lefort F. Metatranscriptomic and metagenomic description of the bacterial nitrogen metabolism in waste water wet oxidation effluents. Heliyon 2017; 3:e00427. [PMID: 29062974 PMCID: PMC5647474 DOI: 10.1016/j.heliyon.2017.e00427] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/19/2017] [Revised: 09/06/2017] [Accepted: 10/11/2017] [Indexed: 11/18/2022] Open
Abstract
Anaerobic digestion is a common method for reducing the amount of sludge solids in used waters and enabling biogas production. The wet oxidation process (WOX) improves anaerobic digestion by converting carbon into methane through oxidation of organic compounds. WOX produces effluents rich in ammonia, which must be removed to maintain the activity of methanogens. Ammonia removal from WOX could be biologically operated by aerobic granules. To this end, granulation experiments were conducted in 2 bioreactors containing an activated sludge (AS). For the first time, the dynamics of the microbial community structure and the expression levels of 7 enzymes of the nitrogen metabolism in such active microbial communities were followed in regard to time by metagenomics and metatranscriptomics. It was shown that bacterial communities adapt to the wet oxidation effluent by increasing the expression level of the nitrogen metabolism, suggesting that these biological activities could be a less costly alternative for the elimination of ammonia, resulting in a reduction of the use of chemicals and energy consumption in sewage plants. This study reached a strong sequencing depth (from 4.4 to 7.6 Gb) and enlightened a yet unknown diversity of the microorganisms involved in the nitrogen pathway. Moreover, this approach revealed the abundance and expression levels of specialised enzymes involved in nitrification, denitrification, ammonification, dissimilatory nitrate reduction to ammonium (DNRA) and nitrogen fixation processes in AS.
Collapse
Affiliation(s)
- Julien Crovadore
- Plants and pathogens group, Institute Land Nature and Environment, Hepia, HES-SO University of Applied Sciences and Arts Western Switzerland, 150 route de Presinge, 1254 Jussy, Switzerland
| | - Vice Soljan
- Puratis Sàrl, EPFL Innovation Park, Building C, 1015 Lausanne, Switzerland
| | - Gautier Calmin
- Faculty of Engineering and Architecture, HES-SO University of Applied Sciences and Arts Western Switzerland, Rue de la Jeunesse 1, 2800 Delémont, Switzerland
| | - Romain Chablais
- Plants and pathogens group, Institute Land Nature and Environment, Hepia, HES-SO University of Applied Sciences and Arts Western Switzerland, 150 route de Presinge, 1254 Jussy, Switzerland
| | - Bastien Cochard
- Plants and pathogens group, Institute Land Nature and Environment, Hepia, HES-SO University of Applied Sciences and Arts Western Switzerland, 150 route de Presinge, 1254 Jussy, Switzerland
| | - François Lefort
- Plants and pathogens group, Institute Land Nature and Environment, Hepia, HES-SO University of Applied Sciences and Arts Western Switzerland, 150 route de Presinge, 1254 Jussy, Switzerland
| |
Collapse
|
221
|
Wang X, Yang T, Lin B, Tang Y. Effects of salinity on the performance, microbial community, and functional proteins in an aerobic granular sludge system. CHEMOSPHERE 2017; 184:1241-1249. [PMID: 28672723 DOI: 10.1016/j.chemosphere.2017.06.047] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2017] [Revised: 06/07/2017] [Accepted: 06/13/2017] [Indexed: 06/07/2023]
Abstract
The response mechanism of aerobic granular sludge (AGS) systems to salt stress in high-salinity wastewater treatment processes has not been fully elucidated in current studies. The aim of this study was to reveal the comprehensive effects of salinity on AGS characteristics using microbial community and metaproteomics analyses. The results showed that the removal efficiency of COD, TN and TP decreased significantly with increasing salinity. Under salt stress, the Na+ content in AGS decreased, while the K+ and Ca2+ contents increased. This was because the salt-tolerant mechanism of the microorganisms was dependent on the uptake of K+ and ejection of Na+via K+/Na+ pumps, Na+/H+ reversed transport proteins, and K+ channels. Compared with the salt-free condition, 14 of 25 different protein spots were identified successfully by metaproteomic analysis, including porin, periplasmic-binding protein, and ATP-binding cassette-type for phosphonate transporter, which were expressed mainly by members of γ-Proteobacteria and α-Proteobacteria. The variations in functional proteins and microbial community revealed that α- and γ-Proteobacteria had disproportionally active and the metabolic activity of β-Proteobacteria was inhibited by increasing salinity. Additionally, Psychrobacter sp. was confirmed to be a predominant bacterium at 15 g/L NaCl, as the porin was strongly expressed.
Collapse
Affiliation(s)
- Xingang Wang
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212018, PR China.
| | - Tongyi Yang
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212018, PR China.
| | - Bing Lin
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212018, PR China.
| | - Yubin Tang
- School of Environmental and Chemical Engineering, Jiangsu University of Science and Technology, Zhenjiang 212018, PR China.
| |
Collapse
|
222
|
Mesdaghinia A, Ghahremani MH, Nabizadeh R, Nasseri S, Rafiee M. Role of CODPCP/CODTotal ratio on p-chlorophenol toxicity towards aerobic granular sludge. J IND ENG CHEM 2017. [DOI: 10.1016/j.jiec.2017.06.025] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
223
|
He Q, Zhou J, Song Q, Zhang W, Wang H, Liu L. Elucidation of microbial characterization of aerobic granules in a sequencing batch reactor performing simultaneous nitrification, denitrification and phosphorus removal at varying carbon to phosphorus ratios. BIORESOURCE TECHNOLOGY 2017; 241:127-133. [PMID: 28551433 DOI: 10.1016/j.biortech.2017.05.093] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/05/2017] [Revised: 05/12/2017] [Accepted: 05/16/2017] [Indexed: 06/07/2023]
Abstract
An aerobic granules simultaneous nitrification, denitrification and phosphorus removal (SNDPR) system was evaluated in terms of the reactor performance and microbial population dynamics with decreasing C/P ratios from 50 to 16. The effects of C/P ratios on organic carbon and nutrients removal were investigated, as well as the alpha diversity of the bacterial community and bacterial compositions by using Illumina MiSeq pyrosequencing technology. Finally, the relative abundances and distribution patterns were identified and assessed given the key functional groups involved in biological nutrients removals to reveal the effects of C/P ratios to aerobic granules in the SNDPR from the molecular level.
Collapse
Affiliation(s)
- Qiulai He
- School of Civil Engineering, Wuhan University, Wuhan 430072, China
| | - Jun Zhou
- College of Urban Construction, Nanjing University of Technology, Nanjing 210009, China
| | - Qun Song
- School of Civil Engineering, Wuhan University, Wuhan 430072, China
| | - Wei Zhang
- School of Civil Engineering, Wuhan University, Wuhan 430072, China
| | - Hongyu Wang
- School of Civil Engineering, Wuhan University, Wuhan 430072, China.
| | - Li Liu
- Guangzhou Municipal Engineering Design & Research Institute, Guangzhou 510060, China
| |
Collapse
|
224
|
Chaudhari AU, Paul D, Dhotre D, Kodam KM. Effective biotransformation and detoxification of anthraquinone dye reactive blue 4 by using aerobic bacterial granules. WATER RESEARCH 2017; 122:603-613. [PMID: 28628882 DOI: 10.1016/j.watres.2017.06.005] [Citation(s) in RCA: 52] [Impact Index Per Article: 7.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/13/2017] [Accepted: 06/03/2017] [Indexed: 05/18/2023]
Abstract
Treatment of textile wastewater containing anthraquinone dye is quite a huge challenge due to its complex aromatic structure and toxicity. Present study deals with the degradation and detoxification of anthraquinone dye reactive blue 4 using aerobic bacterial granules. Bacterial granules effectively decolorized reactive blue 4 at wide range of pH (4.0-11.0) and temperature (20-55 °C) as well as decolorized and tolerated high concentration of reactive blue 4 dye upto 1000 mg l-1 with Vmax 6.16 ± 0.82 mg l-1 h-1 and Km 227 ± 41 mg l-1. Metagenomics study evaluates important role of Clostridia, Actinobacteria, and Proteobacterial members in biotransformation and tolerance of high concentrations of reactive blue 4 dye. Up-regulation of xenobiotic degradation and environmental information processing pathways during dye exposure signifies their noteworthy role in dye degradation. Biotransformation of dye was confirmed by significant decrease in the values of total suspended solids, biological and chemical oxygen demand. The metabolites formed after biotransformation was characterized by FT-IR and GC-MS analysis. The reactive blue 4 dye was found to be phytotoxic, cytotoxic and genotoxic whereas its biotransformed product were non-toxic. This study comprehensively illustrates that, bacterial aerobic granules can be used for eco-friendly remediation and detoxification of wastewater containing high organic load of anthraquinone dye.
Collapse
Affiliation(s)
- Ashvini U Chaudhari
- Biochemistry Division, Department of Chemistry, Savitribai Phule Pune University, Pune, 411007, India
| | - Dhiraj Paul
- Microbial Culture Collection, National Centre for Cell Science, Pune, 411021, India
| | - Dhiraj Dhotre
- Microbial Culture Collection, National Centre for Cell Science, Pune, 411021, India
| | - Kisan M Kodam
- Biochemistry Division, Department of Chemistry, Savitribai Phule Pune University, Pune, 411007, India.
| |
Collapse
|
225
|
Sun H, Yu P, Li Q, Ren H, Liu B, Ye L, Zhang XX. Transformation of anaerobic granules into aerobic granules and the succession of bacterial community. Appl Microbiol Biotechnol 2017; 101:7703-7713. [PMID: 28916990 DOI: 10.1007/s00253-017-8491-2] [Citation(s) in RCA: 12] [Impact Index Per Article: 1.7] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2017] [Revised: 07/25/2017] [Accepted: 07/30/2017] [Indexed: 01/09/2023]
Abstract
In this study, we demonstrated that anaerobic granular sludge could be successfully transformed into aerobic granular sludge in a continuous up-flow reactor in 45 days. An aerobic microbial community successfully developed in the granules and high organic matter and nitrogen removal performance was achieved. Under an ammonia nitrogen loading rate of 0.8 kg N/(m3 day), ammonia nitrogen and the total nitrogen removal efficiency of the reactor reached up to 100 and 93%, respectively. An obvious bacterial community shift in granular sludge was observed during the transformation process. By comparing with the bacterial community in aerobic granules cultivated from floccular activated sludge, some bacteria (affiliated with Comamonadaceae, Xanthomonadaceae, Rhodocyclaceae, Moraxellaceae, and Nitrosomonadaceae) playing significant roles in maintaining the structures and functions of aerobic granules were identified. After the transformation, the granules could be clearly separated into the inner core and outer shell. 16S rRNA gene sequencing results indicated many bacterial species present in both the inner core and outer shell; however, their abundance differed significantly. Overall, this study confirms the feasibility of transforming anaerobic granules into aerobic granules and provides novel approaches and insights to understand the microbial ecology in granular sludge.
Collapse
Affiliation(s)
- Haohao Sun
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Avenue, Nanjing, 210023, China
| | - Ping Yu
- Jiangsu Information Institute of Science and Technology, 117 Longpan Road, Nanjing, 210042, China
| | - Qiaoling Li
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Avenue, Nanjing, 210023, China
| | - Hongqiang Ren
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Avenue, Nanjing, 210023, China
| | - Bo Liu
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Avenue, Nanjing, 210023, China
| | - Lin Ye
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Avenue, Nanjing, 210023, China.
| | - Xu-Xiang Zhang
- State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, 163 Xianlin Avenue, Nanjing, 210023, China.
| |
Collapse
|
226
|
Bindhu BK, Madhu G. Application of grey system theory on the influencing parameters of aerobic granulation in SBR. ENVIRONMENTAL TECHNOLOGY 2017; 38:2143-2152. [PMID: 27799011 DOI: 10.1080/09593330.2016.1246617] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/11/2016] [Accepted: 09/27/2016] [Indexed: 06/06/2023]
Abstract
Aerobic granulation is a promising technology for wastewater treatment. Four operational parameters were selected as influencing factors for this study. Aerobic granulation was experimented with three different values of organic loading rate (3, 6 and 9 kg COD m-3 d-1), superficial upflow air velocity (SUAV) (2, 3 and 4 cm s-1), settling time (3, 5 and 10 min) and volume exchange ratio (25%, 50% and 75%) in sequencing batch reactor in nine trials for the optimal performance of aerobic granulation. The influence of compared parameters on five reference parameters (sludge volume index (SVI), time taken for the appearance of granules, size and specific gravity of granules and chemical oxygen demand (COD) removal) was analyzed using grey system theory. The grey relational coefficients and grey entropy relational grade of each parameter were calculated. Hydrodynamic shear force in terms of SUAV was found to have the greatest influence on granule appearance, specific gravity of granules and COD removal efficiency. SVI is greatly affected by settling time. The optimal scopes of all the compared parameters were found.
Collapse
Affiliation(s)
- B K Bindhu
- a Department of Civil Engineering , Rajiv Gandhi Institute of Technology , Kottayam , Kerala , India
| | - G Madhu
- b Safety and Fire Engineering Division, School of Engineering , Cochin University of Science and Technology , Cochin , Kerala , India
| |
Collapse
|
227
|
Gonzalez-Martinez A, Muñoz-Palazon B, Rodriguez-Sanchez A, Maza-Márquez P, Mikola A, Gonzalez-Lopez J, Vahala R. Start-up and operation of an aerobic granular sludge system under low working temperature inoculated with cold-adapted activated sludge from Finland. BIORESOURCE TECHNOLOGY 2017; 239:180-189. [PMID: 28521227 DOI: 10.1016/j.biortech.2017.05.037] [Citation(s) in RCA: 37] [Impact Index Per Article: 5.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/17/2017] [Revised: 05/04/2017] [Accepted: 05/07/2017] [Indexed: 06/07/2023]
Abstract
An aerobic granular sludge system has been started-up and operated at 7°C temperature using cold-adapted activated sludge as inoculum. The system could form granular biomass due to batch operation allowing for just 5-3min of biomass sedimentation. Scanning electron microscopy showed that fungi helped in the granular biomass formation in the early stages of the granule formation. The removal performance of the system was of 92-95% in BOD5, 75-80% in COD, 70-76% in total nitrogen and 50-60% in total phosphorous. The bacterial community structure from cold-adapted activated sludge changed during the operational time, leading to a final configuration dominated by Microbacteriaceae members Microbacterium and Leucobacter, which were strongly correlated to biomass settling velocity and bioreactor performance, as suggested by multivariate redundancy analyses. This experiment showed that aerobic granular sludge systems could be successfully started-up and operated, with high performance, under low operational temperatures when using cold-adapted biomass as inoculum.
Collapse
Affiliation(s)
| | - Barbara Muñoz-Palazon
- Institute of Water Research, University of Granada, C/Ramon y Cajal, 4, 18071 Granada, Spain
| | | | - Paula Maza-Márquez
- Institute of Water Research, University of Granada, C/Ramon y Cajal, 4, 18071 Granada, Spain
| | - Anna Mikola
- Department of Built Environment, University of Aalto, P.O. Box 15200, Aalto, FI-00076 Espoo, Finland
| | - Jesus Gonzalez-Lopez
- Institute of Water Research, University of Granada, C/Ramon y Cajal, 4, 18071 Granada, Spain
| | - Riku Vahala
- Department of Built Environment, University of Aalto, P.O. Box 15200, Aalto, FI-00076 Espoo, Finland
| |
Collapse
|
228
|
Iorhemen OT, Hamza RA, Tay JH. Membrane fouling control in membrane bioreactors (MBRs) using granular materials. BIORESOURCE TECHNOLOGY 2017; 240:9-24. [PMID: 28314664 DOI: 10.1016/j.biortech.2017.03.005] [Citation(s) in RCA: 29] [Impact Index Per Article: 4.1] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/15/2016] [Revised: 02/25/2017] [Accepted: 03/01/2017] [Indexed: 06/06/2023]
Abstract
Membrane fouling is considered the major limitation of membrane bioreactors (MBRs). This paper provides an overview on fouling mitigation in MBRs using granular materials. Adsorbents addition extends filtration period, improves critical flux as well as sludge properties (increased flocs size, reduced soluble EPS, improved dewaterability). However, determination of optimal dosages of adsorbents is needed to balance cost savings from fouling mitigation versus cost of adsorbents and sludge handling. The abrasion from granular media reduces cake layer formation, extends membrane filtration period, increases flux (∼20-30%), and reduces aeration intensity by 50%. Finding appropriate aeration intensity and optimum dose for different media is critical for full-scale application. Granular sludge substantially reduces fouling in MBRs; but, optimal operational conditions for long-term granule stability are required. Quorum quenching (QQ) mitigates biofouling (energy savings ∼27-40%). Cost savings from QQ need assessment against the production and application of QQ approaches.
Collapse
Affiliation(s)
- Oliver Terna Iorhemen
- Department of Civil Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada.
| | - Rania Ahmed Hamza
- Department of Civil Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada
| | - Joo Hwa Tay
- Department of Civil Engineering, University of Calgary, 2500 University Drive NW, Calgary, Alberta T2N 1N4, Canada
| |
Collapse
|
229
|
Rojas-Z U, Fajardo-O C, Moreno-Andrade I, Monroy O. Greywater treatment in an aerobic SBR: sludge structure and kinetics. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2017; 76:1535-1544. [PMID: 28953479 DOI: 10.2166/wst.2017.341] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/07/2023]
Abstract
In order to have an efficient operation, sequencing batch reactors (SBR) must support granular biomass with high conversion rates, settling properties, and be able to deal with the inherent variability of the composition of real wastewaters. In this study, the effect of the influent composition and the specific organic loading rate (Bx) on the granulation process was evaluated in two SBRs, fed with greywater (GW) and a synthetic medium (SM). The feeding with SM led to the formation of compact granular biomass, with a sludge volume index (SVI) of 22.4 mL g-1, and a zone settling velocity (ZSV) of 13.1 m h-1. In contrast, feeding with GW induced the formation of filamentous granules, with lower settling properties (SVI = 165 mL g-1 and ZSV = 10 m h-1), when the system was operated at high Bx (4.4 kg COD kg VSS-1 d-1). However, the reduction of the average Bx to 2 kg COD kg VSS-1 d-1 induced an improvement in the morphology and properties of the granules (SVI = 98 mL g-1 and ZSV = 13 m h-1). Furthermore, the kinetic analysis indicated that granules cultivated with SM were formed by fast growing microorganisms with a high cell yield, whereas those cultivated in GW presented a much lower cell yield.
Collapse
Affiliation(s)
- U Rojas-Z
- Department of Biotechnology, Universidad Autónoma Metropolitana-Iztapalapa, Av. San Rafael Atlixco 186, Col. Vicentina, Mexico City 09340, Mexico E-mail:
| | - C Fajardo-O
- Department of Biotechnology, Universidad Autónoma Metropolitana-Iztapalapa, Av. San Rafael Atlixco 186, Col. Vicentina, Mexico City 09340, Mexico E-mail:
| | - I Moreno-Andrade
- Laboratory for Research on Advanced Processes for Water Treatment, Engineering Institute, Unidad Académica Juriquilla, Universidad Nacional Autónoma de México, Blvd. Juriquilla 3001, Querétaro 76230, Mexico
| | - O Monroy
- Department of Biotechnology, Universidad Autónoma Metropolitana-Iztapalapa, Av. San Rafael Atlixco 186, Col. Vicentina, Mexico City 09340, Mexico E-mail:
| |
Collapse
|
230
|
Ramos C, Amorim CL, Mesquita DP, Ferreira EC, Carrera J, Castro PML. Simultaneous partial nitrification and 2-fluorophenol biodegradation with aerobic granular biomass: Reactor performance and microbial communities. BIORESOURCE TECHNOLOGY 2017; 238:232-240. [PMID: 28433913 DOI: 10.1016/j.biortech.2017.03.173] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2017] [Revised: 03/24/2017] [Accepted: 03/28/2017] [Indexed: 06/07/2023]
Abstract
An aerobic granular bioreactor was operated for over 4months, treating a synthetic wastewater with a high ammonium content (100mgNL-1). The inoculum was collected from a bioreactor performing simultaneous partial nitrification and aromatic compounds biodegradation. From day-56 onwards, 2-fluorophenol (2-FP) (12.4mgL-1) was added to the feeding wastewater and the system was bioaugmented with a 2-FP degrading bacteria (Rhodococcus sp. FP1). By the end of operation, complete 2-FP biodegradation and partial nitrification were simultaneously achieved. Aerobic granules remained stable over time. During the 2-FP loading, a shift in the community structure occurred, coinciding with the improvement of 2-FP degradation. DGGE analysis did not allow to infer on the bioaugmented strain presence but pyrosequencing analysis detected Rhodococcus genus by the end of operation. Together with other potential phenolic-degraders within granules, these microorganisms were probably responsible for 2-FP degradation.
Collapse
Affiliation(s)
- Carlos Ramos
- GENOCOV Research Group, Department of Chemical, Biological and Environmental Engineering, School of Engineering, Universitat Autònoma de Barcelona, Ed. Q - Campus UAB, 08193 Bellaterra, Barcelona, Spain.
| | - Catarina L Amorim
- Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina e Laboratório Associado, Escola Superior de Biotecnologia, Rua Arquiteto Lobão Vital, Apartado 2511, 4202-401 Porto, Portugal; Departamento de Biologia e Centro de Estudos do Ambiente e do Mar (CESAM), Universidade de Aveiro, Aveiro 3810-193, Portugal
| | - Daniela P Mesquita
- CEB - Centre of Biological Engineering, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Eugénio C Ferreira
- CEB - Centre of Biological Engineering, Universidade do Minho, Campus de Gualtar, 4710-057 Braga, Portugal
| | - Julián Carrera
- GENOCOV Research Group, Department of Chemical, Biological and Environmental Engineering, School of Engineering, Universitat Autònoma de Barcelona, Ed. Q - Campus UAB, 08193 Bellaterra, Barcelona, Spain
| | - Paula M L Castro
- Universidade Católica Portuguesa, CBQF - Centro de Biotecnologia e Química Fina e Laboratório Associado, Escola Superior de Biotecnologia, Rua Arquiteto Lobão Vital, Apartado 2511, 4202-401 Porto, Portugal
| |
Collapse
|
231
|
Caluwé M, Dobbeleers T, D'aes J, Miele S, Akkermans V, Daens D, Geuens L, Kiekens F, Blust R, Dries J. Formation of aerobic granular sludge during the treatment of petrochemical wastewater. BIORESOURCE TECHNOLOGY 2017; 238:559-567. [PMID: 28477518 DOI: 10.1016/j.biortech.2017.04.068] [Citation(s) in RCA: 28] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/13/2017] [Revised: 04/17/2017] [Accepted: 04/18/2017] [Indexed: 06/07/2023]
Abstract
In this study, petrochemical wastewater from the port of Antwerp was used for the development of aerobic granular sludge. Two different reactor setups were used, (1) a completely aerated sequencing batch reactor (SBRae) with a feast/famine regime and (2) a sequencing batch reactor operated with an anaerobic feast/aerobic famine strategy (SBRan). The seed sludge showed poor settling characteristics with a sludge volume index (SVI) of 285mL.gMLSS-1 and a median particle size by volume of 86.0µm±1.9µm. In both reactors, granulation was reached after 30days with a SVI of 71mL.gMLSS-1 and median granule size of 264.7µm in SBRan and a SVI of 56mL.gMLSS-1 and median granule size of 307.4µm in SBRae. The chemical oxygen demand (COD) and dissolved organic carbon (DOC) removal was similar in both reactors and above 95%. The anaerobic DOC uptake increased from 0.13% to 43.2% in 60days in SBRan.
Collapse
Affiliation(s)
- Michel Caluwé
- Research Group BioGEM, Bio-Chemical Green Engineering & Materials, Faculty of Applied Engineering, University of Antwerp, Salesianenlaan 90, 2660 Antwerp, Belgium; SPHERE, Systemic Physiological and Ecotoxicological Research, Department of Biology, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium.
| | - Thomas Dobbeleers
- Research Group BioGEM, Bio-Chemical Green Engineering & Materials, Faculty of Applied Engineering, University of Antwerp, Salesianenlaan 90, 2660 Antwerp, Belgium.
| | - Jolien D'aes
- Research Group BioGEM, Bio-Chemical Green Engineering & Materials, Faculty of Applied Engineering, University of Antwerp, Salesianenlaan 90, 2660 Antwerp, Belgium.
| | - Solange Miele
- National University of Quilmes, Basic and Applied Microbiology Institute, Genetic Engineering and Cellular and Molecular Biology, Buenos Aires, Argentina.
| | - Veerle Akkermans
- Research Group BioGEM, Bio-Chemical Green Engineering & Materials, Faculty of Applied Engineering, University of Antwerp, Salesianenlaan 90, 2660 Antwerp, Belgium.
| | - Dominique Daens
- Research Group BioGEM, Bio-Chemical Green Engineering & Materials, Faculty of Applied Engineering, University of Antwerp, Salesianenlaan 90, 2660 Antwerp, Belgium.
| | - Luc Geuens
- Research Group BioGEM, Bio-Chemical Green Engineering & Materials, Faculty of Applied Engineering, University of Antwerp, Salesianenlaan 90, 2660 Antwerp, Belgium.
| | - Filip Kiekens
- Laboratory of Pharmaceutical Technology and Biopharmacy, Department of Pharmaceutical Science, University of Antwerp, Universiteitsplein 1, 2610 Wilrijk, Belgium.
| | - Ronny Blust
- SPHERE, Systemic Physiological and Ecotoxicological Research, Department of Biology, University of Antwerp, Groenenborgerlaan 171, 2020 Antwerp, Belgium.
| | - Jan Dries
- Research Group BioGEM, Bio-Chemical Green Engineering & Materials, Faculty of Applied Engineering, University of Antwerp, Salesianenlaan 90, 2660 Antwerp, Belgium.
| |
Collapse
|
232
|
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.
Collapse
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.
| |
Collapse
|
233
|
Dobbeleers T, D’aes J, Miele S, Caluwé M, Akkermans V, Daens D, Geuens L, Dries J. Aeration control strategies to stimulate simultaneous nitrification-denitrification via nitrite during the formation of aerobic granular sludge. Appl Microbiol Biotechnol 2017; 101:6829-6839. [DOI: 10.1007/s00253-017-8415-1] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/22/2017] [Revised: 06/28/2017] [Accepted: 06/29/2017] [Indexed: 11/24/2022]
|
234
|
Tiron O, Bumbac C, Manea E, Stefanescu M, Nita Lazar M. Overcoming Microalgae Harvesting Barrier by Activated Algae Granules. Sci Rep 2017; 7:4646. [PMID: 28680112 PMCID: PMC5498540 DOI: 10.1038/s41598-017-05027-3] [Citation(s) in RCA: 62] [Impact Index Per Article: 8.9] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/27/2017] [Accepted: 05/23/2017] [Indexed: 11/09/2022] Open
Abstract
The economic factor of the microalgae harvesting step acts as a barrier to scaling up microalgae-based technology designed for wastewater treatment. In view of that, this study presents an alternative microalgae-bacteria system, which is proposed for eliminating the economic obstacle. Instead of the microalgae-bacteria (activated algae) flocs, the study aimed to develop activated algae granules comprising the microalgae Chlorella sp. as a target species. The presence of the filamentous microalgae (Phormidium sp.) was necessary for the occurrence of the granulation processes. A progressive decrease in frequency of the free Chlorella sp. cells was achieved once with the development of the activated algae granules as a result of the target microalgae being captured in the dense and tangled network of filaments. The mature activated algae granules ranged between 600 and 2,000 µm, and were characterized by a compact structure and significant settling ability (21.6 ± 0.9 m/h). In relation to the main aim of this study, a microalgae recovery efficiency of higher than 99% was achieved only by fast sedimentation of the granules; this performance highlighted the viability of the granular activated algae system for sustaining a microalgae harvesting procedure with neither cost nor energy inputs.
Collapse
Affiliation(s)
- Olga Tiron
- Department of Environmental Technologies and Technological Transfer, National Research and Development Institute for Industrial Ecology - ECOIND, 71-73 Drumul Podu Dambovitei, 060652, Bucharest, Romania.
| | - Costel Bumbac
- Department of Environmental Technologies and Technological Transfer, National Research and Development Institute for Industrial Ecology - ECOIND, 71-73 Drumul Podu Dambovitei, 060652, Bucharest, Romania
| | - Elena Manea
- Department of Environmental Technologies and Technological Transfer, National Research and Development Institute for Industrial Ecology - ECOIND, 71-73 Drumul Podu Dambovitei, 060652, Bucharest, Romania
| | - Mihai Stefanescu
- Department of Environmental Technologies and Technological Transfer, National Research and Development Institute for Industrial Ecology - ECOIND, 71-73 Drumul Podu Dambovitei, 060652, Bucharest, Romania
| | - Mihai Nita Lazar
- Department of Pollution Control, National Research and Development Institute for Industrial Ecology - ECOIND, 71-73 Drumul Podu Dambovitei, 060652, Bucharest, Romania
| |
Collapse
|
235
|
Li S, Li J, Yuan J, Li G, Zang B, Li Y. The influences of inoculants from municipal sludge and solid waste on compost stability, maturity and enzyme activities during chicken manure composting. ENVIRONMENTAL TECHNOLOGY 2017; 38:1770-1778. [PMID: 28278782 DOI: 10.1080/09593330.2017.1291755] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/14/2016] [Accepted: 01/31/2017] [Indexed: 06/06/2023]
Abstract
The aim of this study was to investigate the influence of inoculants on compost stability, maturity and enzyme activities during composting of chicken manure and cornstalk. Two microbial inoculants (originated from aerobic municipal sludge and municipal solid waste, respectively) were used in composting at the rate of 0.3% of initial raw materials (wet weight). No microbial inoculums were added to the control. The experiment was conducted under aerobic conditions for 53 days. The results show that enzyme activity is an important index to comprehensively evaluate the composting stability and maturity. Microbes originated from sludge works best in terms of composting stability and maturity (C:N ratio decreased from 15.5 to 10, and germination index increased to 109%). Microbial inoculums originated from sludge and municipal solid waste extended the time of thermophilic phase for 11 and 7 days, respectively. Microbial inoculums originated from sludge and MSW significantly increased the average of catalase activity (by 15.0% and 12.1%, respectively), urease activity (by 21.5% and 12.2%, respectively) and cellulase activity (by 32.1% and 26.1%, respectively) during composting.
Collapse
Affiliation(s)
- Shuyan Li
- a College of Resources and Environmental Sciences , China Agricultural University , Beijing , People's Republic of China
| | - Jijin Li
- b Institute of Plant Nutrition and Resources , Beijing Academy of Agriculture and Forestry Sciences , Beijing , People's Republic of China
| | - Jing Yuan
- a College of Resources and Environmental Sciences , China Agricultural University , Beijing , People's Republic of China
| | - Guoxue Li
- a College of Resources and Environmental Sciences , China Agricultural University , Beijing , People's Republic of China
| | - Bing Zang
- a College of Resources and Environmental Sciences , China Agricultural University , Beijing , People's Republic of China
| | - Yangyang Li
- a College of Resources and Environmental Sciences , China Agricultural University , Beijing , People's Republic of China
| |
Collapse
|
236
|
Effects of the Food-to-Microorganism (F/M) Ratio on N2O Emissions in Aerobic Granular Sludge Sequencing Batch Airlift Reactors. WATER 2017. [DOI: 10.3390/w9070477] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
|
237
|
Feng S, Tan CH, Constancias F, Kohli GS, Cohen Y, Rice SA. Predation by Bdellovibrio bacteriovorus significantly reduces viability and alters the microbial community composition of activated sludge flocs and granules. FEMS Microbiol Ecol 2017; 93:3044202. [PMID: 28334102 DOI: 10.1093/femsec/fix020] [Citation(s) in RCA: 39] [Impact Index Per Article: 5.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/09/2016] [Accepted: 02/17/2017] [Indexed: 01/21/2023] Open
Abstract
We recently isolated and characterised a predatory Bdellovibrio bacteriovorus strain from activated sludge (Ulu Pandan Water Reclamation Plant, Singapore), and this strain, B. bacteriovorus UP, was able to prey upon a broad spectrum of bacterial isolates from the activated sludge when grown as planktonic cells or as biofilms. Here, we have tested the effect of Bdellovibrio predation on floccular and granular sludge to determine if the spatial organisation, loosely or tightly aggregated communities, was protective from predation. The effect of predation was assessed using a combination of biomass quantification, cellular activity measurement and microscopic image analysis to determine community viability. Additionally, changes in the microbial communities due to predation by B. bacteriovorus UP were analysed through total RNA sequencing. Predation led to a significant reduction in microbial activity and total biomass for both floccular and granular sludge communities. Predation was also associated with significant changes in the microbial community composition in both communities, with >90% of the community members reduced in relative abundance after 24 h. Of those community members, the dominant organisms, such as Proteobacteria and Bacteroidetes, were the most affected phylotypes. This suggests that predatory bacteria, which display indiscriminant feeding, could significantly shift the species composition and thus, may disturb the operational performance of wastewater treatment systems.
Collapse
Affiliation(s)
- Shugeng Feng
- The Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore 637551, Singapore
| | - Chuan Hao Tan
- The Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore 637551, Singapore.,The School of Materials Science and Engineering, Nanyang Technological University, Singapore 637551, Singapore
| | - Florentin Constancias
- The Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore 637551, Singapore
| | - Gurjeet S Kohli
- The Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore 637551, Singapore
| | - Yehuda Cohen
- The Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore 637551, Singapore
| | - Scott A Rice
- The Singapore Centre for Environmental Life Sciences Engineering, Nanyang Technological University, Singapore 637551, Singapore.,The School of Biological Sciences, Nanyang Technological University, Singapore 637551, Singapore.,The Centre for Marine Bio-Innovation, The School of Biological, Earth and Environmental Sciences, The University of New South Wales, Sydney, NSW 2052, Australia
| |
Collapse
|
238
|
Utari PD, Vogel J, Quax WJ. Deciphering Physiological Functions of AHL Quorum Quenching Acylases. Front Microbiol 2017; 8:1123. [PMID: 28674525 PMCID: PMC5474475 DOI: 10.3389/fmicb.2017.01123] [Citation(s) in RCA: 43] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/03/2017] [Accepted: 06/01/2017] [Indexed: 11/13/2022] Open
Abstract
N-Acylhomoserine lactone (AHL)-acylase (also known as amidase or amidohydrolase) is a class of enzyme that belongs to the Ntn-hydrolase superfamily. As the name implies, AHL-acylases are capable of hydrolysing AHLs, the most studied signaling molecules for quorum sensing in Gram-negative bacteria. Enzymatic degradation of AHLs can be beneficial in attenuating bacterial virulence, which can be exploited as a novel approach to fight infection of human pathogens, phytopathogens or aquaculture-related contaminations. Numerous acylases from both prokaryotic and eukaryotic sources have been characterized and tested for the interference of quorum sensing-regulated functions. The existence of AHL-acylases in a multitude of organisms from various ecological niches, raises the question of what the physiological roles of AHL-acylases actually are. In this review, we attempt to bring together recent studies to extend our understanding of the biological functions of these enzymes in nature.
Collapse
Affiliation(s)
- Putri D Utari
- Chemical and Pharmaceutical Biology Department, University of GroningenGroningen, Netherlands
| | - Jan Vogel
- Chemical and Pharmaceutical Biology Department, University of GroningenGroningen, Netherlands
| | - Wim J Quax
- Chemical and Pharmaceutical Biology Department, University of GroningenGroningen, Netherlands
| |
Collapse
|
239
|
Hydrocarbon degradation capacity and population dynamics of a microbial consortium obtained using a sequencing batch reactor in the presence of molasses. BIOTECHNOL BIOPROC E 2017. [DOI: 10.1007/s12257-016-0499-4] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
|
240
|
Cheng K, Hu J, Hou H, Liu B, Chen Q, Pan K, Pu W, Yang J, Wu X, Yang C. Aerobic granular sludge inoculated microbial fuel cells for enhanced epoxy reactive diluent wastewater treatment. BIORESOURCE TECHNOLOGY 2017; 229:126-133. [PMID: 28110229 DOI: 10.1016/j.biortech.2016.12.115] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/22/2016] [Revised: 12/30/2016] [Accepted: 12/31/2016] [Indexed: 06/06/2023]
Abstract
Microbial consortiums aggregated on the anode surface of microbial fuel cells (MFCs) are critical factors for electricity generation as well as biodegradation efficiencies of organic compounds. Here in this study, aerobic granular sludge (AGS) was assembled on the surface of the MFC anode to form an AGS-MFC system with superior performance on epoxy reactive diluent (ERD) wastewater treatment. AGS-MFCs successfully shortened the startup time from 13d to 7d compared to the ones inoculated with domestic wastewater. Enhanced toxicity tolerance as well as higher COD removal (77.8% vs. 63.6%) were achieved. The higher ERD wastewater treatment efficiency of AGS-MFC is possibly attributed to the diverse microbial population on MFC biofilm, as well as the synergic degradation of contaminants by both the MFC anode biofilm and AGS granules.
Collapse
Affiliation(s)
- Kai Cheng
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China
| | - Jingping Hu
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China
| | - Huijie Hou
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China
| | - Bingchuan Liu
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China
| | - Qin Chen
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China
| | - Keliang Pan
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China
| | - Wenhong Pu
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China
| | - Jiakuan Yang
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China
| | - Xu Wu
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China
| | - Changzhu Yang
- College of Environmental Science and Engineering, Huazhong University of Science and Technology, Luoyu Road 1037, Wuhan 430074, PR China.
| |
Collapse
|
241
|
Caluwé M, Dobbeleers T, Daens D, Blust R, Geuens L, Dries J. The effect of the feeding pattern of complex industrial wastewater on activated sludge characteristics and the chemical and ecotoxicological effluent quality. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:10796-10807. [PMID: 28290086 DOI: 10.1007/s11356-017-8712-3] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/18/2016] [Accepted: 02/28/2017] [Indexed: 06/06/2023]
Abstract
Research has demonstrated that the feeding pattern of synthetic wastewater plays an important role in sludge characteristics during biological wastewater treatment. Although considerable research has been devoted to synthetic wastewater, less attention has been paid to industrial wastewater. In this research, three different feeding strategies were applied during the treatment of tank truck cleaning (TTC) water. This industry produces highly variable wastewaters that are often loaded with hazardous chemicals, which makes them challenging to treat with activated sludge (AS). In this study, it is shown that the feeding pattern has a significant influence on the settling characteristics. Pulse feeding resulted in AS with a sludge volume index (SVI) of 68 ± 15 mL gMLSS-1. Slowly and continuously fed AS had to contend with unstable SVI values that fluctuated between 100 and 600 mL gMLSS-1. These fluctuations were clearly caused by the feeding solution. The obtained settling characteristics are being supported by the microscopic analysis, which revealed a clear floc structure for the pulse fed AS. Ecotoxicological effluent assessment with bacteria, Crustacea and algae identified algae as the most sensitive organism for all effluents from all different reactors. Variable algae growth inhibitions were measured between the different reactors. The chemical and ecotoxicological effluent quality was comparable between the reactors.
Collapse
Affiliation(s)
- Michel Caluwé
- Research group BioGEM, Bio-Chemical Green Engineering & Materials, Faculty of Applied Engineering, University of Antwerp, Salesianenlaan 90, 2660, Antwerp, Belgium
- SPHERE, Systemic Physiological and Ecotoxicological Research, Department of Biology, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium
| | - Thomas Dobbeleers
- Research group BioGEM, Bio-Chemical Green Engineering & Materials, Faculty of Applied Engineering, University of Antwerp, Salesianenlaan 90, 2660, Antwerp, Belgium
| | - Dominique Daens
- Research group BioGEM, Bio-Chemical Green Engineering & Materials, Faculty of Applied Engineering, University of Antwerp, Salesianenlaan 90, 2660, Antwerp, Belgium
| | - Ronny Blust
- SPHERE, Systemic Physiological and Ecotoxicological Research, Department of Biology, University of Antwerp, Groenenborgerlaan 171, 2020, Antwerp, Belgium
| | - Luc Geuens
- Research group BioGEM, Bio-Chemical Green Engineering & Materials, Faculty of Applied Engineering, University of Antwerp, Salesianenlaan 90, 2660, Antwerp, Belgium
| | - Jan Dries
- Research group BioGEM, Bio-Chemical Green Engineering & Materials, Faculty of Applied Engineering, University of Antwerp, Salesianenlaan 90, 2660, Antwerp, Belgium.
| |
Collapse
|
242
|
Zhou D, Zhang C, Fu L, Xu L, Cui X, Li Q, Crittenden JC. Responses of the Microalga Chlorophyta sp. to Bacterial Quorum Sensing Molecules (N-Acylhomoserine Lactones): Aromatic Protein-Induced Self-Aggregation. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2017; 51:3490-3498. [PMID: 28233977 DOI: 10.1021/acs.est.7b00355] [Citation(s) in RCA: 67] [Impact Index Per Article: 9.6] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
Bacteria and microalgae often coexist during the recycling of microalgal bioresources in wastewater treatment processes. Although the bacteria may compete with the microalgae for nutrients, they could also facilitate microalgal harvesting by forming algal-bacterial aggregates. However, very little is known about interspecies interactions between bacteria and microalgae. In this study, we investigated the responses of a model microalga, Chlorophyta sp., to the typical quorum sensing (QS) molecules N-acylhomoserine lactones (AHLs) extracted from activated sludge bacteria. Chlorophyta sp. self-aggregated in 200 μm bioflocs by secreting 460-1000 kDa aromatic proteins upon interacting with AHLs, and the settling efficiency of Chlorophyta sp. reached as high as 41%. However, Chlorophyta sp. cells were essentially in a free suspension in the absence of AHLs. Fluorescence intensity of the aromatic proteins had significant (P < 0.05) relationship with the Chlorophyta sp. settleability, and showed a positive correlation, indicating that aromatic proteins helped aggregate microalga. Transcriptome results further revealed up-regulation of synthesis pathways for aromatic proteins from tyrosine and phenylalanine that was assisted by anthranilate accumulation. To the best of our knowledge, this is the first study to confirm that eukaryotic microorganisms can sense and respond to prokaryotic QS molecules.
Collapse
Affiliation(s)
- Dandan Zhou
- School of Environment, Northeast Normal University , Changchun 130117, China
- Jilin Engineering Research Centre for Municipal Wastewater Treatment and Water Quality Protection, Changchun, 130117, China
| | - Chaofan Zhang
- School of Environment, Northeast Normal University , Changchun 130117, China
| | - Liang Fu
- School of Environment, Northeast Normal University , Changchun 130117, China
- Jilin Engineering Research Centre for Municipal Wastewater Treatment and Water Quality Protection, Changchun, 130117, China
| | - Liang Xu
- School of Environment, Northeast Normal University , Changchun 130117, China
- Jilin Engineering Research Centre for Municipal Wastewater Treatment and Water Quality Protection, Changchun, 130117, China
| | - Xiaochun Cui
- School of Environment, Northeast Normal University , Changchun 130117, China
| | - Qingcheng Li
- School of Environment, Northeast Normal University , Changchun 130117, China
| | - John C Crittenden
- School of Environment, Northeast Normal University , Changchun 130117, China
- Brook Byers Institute for Sustainable Systems, and School of Civil & Environmental Engineering, Georgia Institute of Technology , Atlanta, Georgia 30332, United States
| |
Collapse
|
243
|
Yilmaz G, Cetin E, Bozkurt U, Aleksanyan Magden K. Effects of ferrous iron on the performance and microbial community in aerobic granular sludge in relation to nutrient removal. Biotechnol Prog 2017; 33:716-725. [DOI: 10.1002/btpr.2456] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/23/2016] [Revised: 02/20/2017] [Indexed: 11/10/2022]
Affiliation(s)
- Gulsum Yilmaz
- Department of Environmental EngineeringIstanbul UniversityAvcilar Istanbul34320 Turkey
| | - Ender Cetin
- Department of Environmental EngineeringIstanbul UniversityAvcilar Istanbul34320 Turkey
| | - Umit Bozkurt
- Department of Environmental EngineeringIstanbul UniversityAvcilar Istanbul34320 Turkey
| | | |
Collapse
|
244
|
Pedrouso A, Val Del Río A, Campos JL, Méndez R, Mosquera-Corral A. Biomass aggregation influences NaN 3 short-term effects on anammox bacteria activity. WATER SCIENCE AND TECHNOLOGY : A JOURNAL OF THE INTERNATIONAL ASSOCIATION ON WATER POLLUTION RESEARCH 2017; 75:1007-1013. [PMID: 28272030 DOI: 10.2166/wst.2016.587] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/06/2023]
Abstract
The main bottleneck to maintain the long-term stability of the partial nitritation-anammox processes, especially those operated at low temperatures and nitrogen concentrations, is the undesirable development of nitrite oxidizing bacteria (NOB). When this occurs, the punctual addition of compounds with the capacity to specifically inhibit NOB without affecting the process efficiency might be of interest. Sodium azide (NaN3) is an already known NOB inhibitor which at low concentrations does not significantly affect the ammonia oxidizing bacteria (AOB) activity. However, studies about its influence on anammox bacteria are unavailable. For this reason, the objective of the present study was to evaluate the effect of NaN3 on the anammox activity. Three different types of anammox biomass were used: granular biomass comprising AOB and anammox bacteria (G1), anammox enriched granules (G2) and previous anammox granules disaggregated (F1). No inhibitory effect of NaN3 was measured on G1 sludge. However, the anammox activity decreased in the case of G2 and F1. Granular biomass activity was less affected (IC50 90 mg/L, G2) than flocculent one (IC50 5 mg/L, F1). Summing up, not only does the granular structure protect the anammox bacteria from the NaN3 inhibitory effect, but also the AOB act as a barrier decreasing the inhibition.
Collapse
Affiliation(s)
- A Pedrouso
- Department of Chemical Engineering, School of Engineering, Universidade de Santiago de Compostela, Santiago de Compostela E-15705, Spain E-mail:
| | - A Val Del Río
- Department of Chemical Engineering, School of Engineering, Universidade de Santiago de Compostela, Santiago de Compostela E-15705, Spain E-mail:
| | - J L Campos
- Facultad de Ingeniería y Ciencias, Universidad Adolfo Ibáñez, Viña del Mar, Chile
| | - R Méndez
- Department of Chemical Engineering, School of Engineering, Universidade de Santiago de Compostela, Santiago de Compostela E-15705, Spain E-mail:
| | - A Mosquera-Corral
- Department of Chemical Engineering, School of Engineering, Universidade de Santiago de Compostela, Santiago de Compostela E-15705, Spain E-mail:
| |
Collapse
|
245
|
Liang XY, Gao BY, Ni SQ. Effects of magnetic nanoparticles on aerobic granulation process. BIORESOURCE TECHNOLOGY 2017; 227:44-49. [PMID: 28013135 DOI: 10.1016/j.biortech.2016.12.038] [Citation(s) in RCA: 24] [Impact Index Per Article: 3.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2016] [Revised: 12/07/2016] [Accepted: 12/11/2016] [Indexed: 06/06/2023]
Abstract
A novel granulation strategy by introducing magnetic nanoparticles (MNPs) into activated sludge system was investigated in this study. The study of the physicochemical characteristics (appearances, sizes, sludge volume index, and chemical oxygen demand) demonstrated that MNPs could decrease the granulation time and improve the retention of biomass, meanwhile enhanced the compact structure of the granules. The secretion and functional groups especially OH and CO of extracellular polymeric substances (EPS) also had significant changes under the long-term influence of MNPs. The contents of proteins (PN) and polysaccharides (PS) in R2 (with MNPs) were 95.7523mg/gVSS and 43.7129mg/gVSS, while in R1 (without MNPs) they were 85.7523mg/gVSS and 32.8632mg/gVSS, respectively. The contact angles of sludge against water dramatically increased with the increase of MNPs concentration, which means that the addition of MNPs could improve the sludge surface hydrophobicity, playing a positive role in the aggregation process.
Collapse
Affiliation(s)
- Xue-You Liang
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan 250100, Shandong, PR China
| | - Bao-Yu Gao
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan 250100, Shandong, PR China
| | - Shou-Qing Ni
- Shandong Provincial Key Laboratory of Water Pollution Control and Resource Reuse, School of Environmental Science and Engineering, Shandong University, No. 27 Shanda South Road, Jinan 250100, Shandong, PR China.
| |
Collapse
|
246
|
Zhang C, Sun S, Liu X, Wan C, Lee DJ. Influence of operational conditions on the stability of aerobic granules from the perspective of quorum sensing. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2017; 24:7640-7649. [PMID: 28124264 DOI: 10.1007/s11356-017-8417-7] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/13/2016] [Accepted: 01/05/2017] [Indexed: 06/06/2023]
Abstract
Integrated aerobic granules were first cultivated in two sequencing batch reactors (SBRs) (A1 and A2). Then, A1's influent organic loading rate (OLR) was changed from alternating to constant (cycling time was still 6 h), while A2's cycling time varied from 6 to 4 h (influent OLR strategy remained alternating). After 30-day operation since the manipulative alternations, granule breakage happened in two reactors at different operational stages, along with the decrease of granule intensity. Granule diameter in A1 declined from the original 0.84 to 0.32 cm during the whole operation, while granules in A2 dwindled to 0.31 cm on day 22 with similar size to A1. Both the amount of total extracellular polymeric substances (EPSs) and the protein were declining throughout the operation, and the large molecular weight of protein was considered closely related to the stability of aerobic granules. The relative AI-2 level decreased at the same time, and influent OLR strategy might had more evident impact on quorum sensing (QS) ability of sludge compared with starvation period. Combined with microbial results, the decline of total EPS amount in two reactors could be concluded as follows: During the reactor operation, some functional bacteria gradually lost their dominance and were eliminated from the reactors, which finally caused granule disintegration. In summary, the results further confirmed that alternating OLR and proper starvation period were two major factors in effective cultivation and stability of aerobic granules from the perspective of QS.
Collapse
Affiliation(s)
- Chen Zhang
- Shanghai Municipal Engineering Design General Institute, Shanghai, 200092, China
| | - Supu Sun
- Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, China
| | - Xiang Liu
- Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, China.
| | - Chunli Wan
- Department of Environmental Science and Engineering, Fudan University, Shanghai, 200433, China.
| | - Duu-Jong Lee
- Department of Chemical Engineering, National Taiwan University, Taipei, 106, Taiwan
| |
Collapse
|
247
|
De Sanctis M, Del Moro G, Chimienti S, Ritelli P, Levantesi C, Di Iaconi C. Removal of pollutants and pathogens by a simplified treatment scheme for municipal wastewater reuse in agriculture. THE SCIENCE OF THE TOTAL ENVIRONMENT 2017; 580:17-25. [PMID: 27951439 DOI: 10.1016/j.scitotenv.2016.12.002] [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: 10/14/2016] [Revised: 11/30/2016] [Accepted: 12/01/2016] [Indexed: 05/07/2023]
Abstract
The availability of high quality water has become a constraint in several countries. Agriculture represents the main water user, therefore, wastewater reuse in this area could increase water availability for other needs. This research was aimed to provide a simplified scheme for treatment and reuse of municipal and domestic wastewater based on Sequencing Batch Biofilter Granular Reactors (SBBGRs). The activity was conducted at pilot-scale and particular attention was dedicated to the microbiological quality of treated wastewater to evaluate the risk associated to its reuse. The following microorganisms were monitored: Escherichia coli, Salmonella, Clostridium perfringens, somatic coliphages, adenovirus, enterovirus, Giardia lamblia and Cryptosporidium parvum. The possibility of SBBGR enhancement with sand filtration was also evaluated. The SBBGR removed >90% of suspended solids and chemical oxygen demand, and 80% and 60% of total nitrogen and phosphorous, respectively. SBBGR was also effective in removing microbial indicators, from 1 (for C. perfringens) up to 4 (for E. coli) log units of these microorganisms. In particular, the quality of SBBGR effluent was already compatible with the WHO criteria for reuse (E. coli ≤103CFU/100mL). Sand filtration had positive effects on plant effluent quality and the latter could even comply with more restrictive reuse criteria.
Collapse
Affiliation(s)
- Marco De Sanctis
- Water Research Institute, CNR, Via F. De Blasio 5, 70123 Bari, Italy.
| | - Guido Del Moro
- Water Research Institute, CNR, Via F. De Blasio 5, 70123 Bari, Italy
| | - Silvia Chimienti
- Water Research Institute, CNR, Via F. De Blasio 5, 70123 Bari, Italy
| | | | - Caterina Levantesi
- Water Research Institute, CNR, Via Salaria Km 29.300, 00015 Monterotondo, RM, Italy
| | - Claudio Di Iaconi
- Water Research Institute, CNR, Via F. De Blasio 5, 70123 Bari, Italy
| |
Collapse
|
248
|
Amorim CL, Moreira IS, Duque AF, van Loosdrecht MCM, Castro PML. Aerobic Granular Sludge. TECHNOLOGIES FOR THE TREATMENT AND RECOVERY OF NUTRIENTS FROM INDUSTRIAL WASTEWATER 2017. [DOI: 10.4018/978-1-5225-1037-6.ch009] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 01/02/2023]
Abstract
Aerobic Granular Sludge (AGS) has been successfully applied for carbon, nitrogen and phosphorous removal from wastewaters, in a single tank, reducing the space and energy requirements. This is especially beneficial for, often space restricted, industrial facilities. Moreover, AGS holds a promise for the toxic pollutants removal, due to its layered and compact structure and the bacteria embedding in a protective extracellular polymeric matrix. These outstanding features contribute to AGS tolerance to toxicity and stability. Strategies available to deal with toxic compounds, namely granulation with effluents containing toxics and bioaugmentation, are addressed here. Different applications for the toxics/micropollutants removal through biosorption and/or biodegradation are presented, illustrating the technology versatility. The anthropogenic substances effects on system performance and bacterial populations established within AGS are also addressed. Combination of contaminants removal to allow water discharge, and simultaneous valuable products recovery are presented as final remark.
Collapse
Affiliation(s)
- Catarina L. Amorim
- Universidade Católica Portuguesa, Portugal & University of Aveiro, Portugal
| | | | - Anouk F. Duque
- Universidade Católica Portuguesa, Portugal & Universidade Nova de Lisboa, Portugal
| | | | | |
Collapse
|
249
|
Microalgal Cultivation in Secondary Effluent: Recent Developments and Future Work. Int J Mol Sci 2017; 18:ijms18010079. [PMID: 28045437 PMCID: PMC5297713 DOI: 10.3390/ijms18010079] [Citation(s) in RCA: 22] [Impact Index Per Article: 3.1] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/27/2016] [Accepted: 12/28/2016] [Indexed: 11/17/2022] Open
Abstract
Eutrophication of water catchments and the greenhouse effect are major challenges in developing the global economy in the near future. Secondary effluents, containing high amounts of nitrogen and phosphorus, need further treatment before being discharged into receiving water bodies. At the same time, new environmentally friendly energy sources need to be developed. Integrating microalgal cultivation for the production of biodiesel feedstock with the treatment of secondary effluent is one way of addressing both issues. This article provides a comprehensive review of the latest progress in microalgal cultivation in secondary effluent to remove pollutants and accumulate lipids. Researchers have discovered that microalgae remove nitrogen and phosphorus effectively from secondary effluent, accumulating biomass and lipids in the process. Immobilization of appropriate microalgae, and establishing a consortium of microalgae and/or bacteria, were both found to be feasible ways to enhance pollutant removal and lipid production. Demonstrations of pilot-scale microalgal cultures in secondary effluent have also taken place. However there is still much work to be done in improving pollutants removal, biomass production, and lipid accumulation in secondary effluent. This includes screening microalgae, constructing the consortium, making use of flue gas and nitrogen, developing technologies related to microalgal harvesting, and using lipid-extracted algal residues (LEA).
Collapse
|
250
|
Devlin TR, di Biase A, Kowalski M, Oleszkiewicz JA. Granulation of activated sludge under low hydrodynamic shear and different wastewater characteristics. BIORESOURCE TECHNOLOGY 2017; 224:229-235. [PMID: 27847238 DOI: 10.1016/j.biortech.2016.11.005] [Citation(s) in RCA: 35] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/04/2016] [Revised: 10/25/2016] [Accepted: 11/02/2016] [Indexed: 06/06/2023]
Abstract
Five reactors were operated with low upflow superficial air velocities (0.41cmmin-1) in order to observe granulation on synthetic wastewaters with different characteristics: 1) 340mg-CODL-1; 2) 630mg-CODL-1; and 3) 1300mg-CODL-1. Stable granulation was only observed under low hydrodynamic shear for low-strength wastewater. 55-70% of soluble chemical oxygen demand (COD) was utilized before aeration and 91% COD, 62% total nitrogen (TN), and 96% total phosphorus (TP) were removed from the low-strength wastewater. Although medium-strength wastewater did generate granules they rapidly acquired a filamentous surface layer that resulted in decreased performance and loss of nitrification. 94% COD, 30% TN, and 85% TP were removed from the medium-strength wastewater. The high-strength wastewater did not develop granules and 85% COD was removed. Results demonstrated that high shear force was not required for granulation. Rather, granulation depended on multiple parameters to out-select rapidly growing aerobic microorganisms.
Collapse
Affiliation(s)
- T R Devlin
- Civil Engineering, University of Manitoba, 15 Gillson St. Room E1-368A, Winnipeg, MB R3T 5V6, Canada.
| | - A di Biase
- Civil Engineering, University of Manitoba, 15 Gillson St. Room E1-368A, Winnipeg, MB R3T 5V6, Canada
| | - M Kowalski
- Civil Engineering, University of Manitoba, 15 Gillson St. Room E1-368A, Winnipeg, MB R3T 5V6, Canada
| | - J A Oleszkiewicz
- Civil Engineering, University of Manitoba, 15 Gillson St. Room E1-368A, Winnipeg, MB R3T 5V6, Canada
| |
Collapse
|