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Deng J, Huang Z, Ruan W. Growth and genetic analysis of Pseudomonas BT1 in a high-thiourea environment reveals the mechanisms by which it restores the ability to remove ammonia nitrogen from wastewater. ENVIRONMENTAL TECHNOLOGY 2023; 44:3763-3776. [PMID: 35481797 DOI: 10.1080/09593330.2022.2071643] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/03/2022] [Accepted: 04/22/2022] [Indexed: 06/14/2023]
Abstract
Thiourea is widely present in wastewater and can inhibit the nitrification process, inducing the collapse of the nitrification system in sewage treatment plants. Pseudomonas BT1 can restore the ammonia nitrogen removal ability of wastewater treatment processes in which the nitrification system due to thiourea. However, the genetic mechanisms for BT1 are still unclear. In this study, we reported the first genome assembly for Pseudomonas BT1, which has a genome size of 5,576,102 bp and 5,115 predicted genes. Complete C and S metabolic cycles were identified in its genome, and some intersecting intermediate products were found in these cycles. BT1 can grow well and remove ammonia nitrogen at different thiourea concentrations, but it showed a better removal ability in high-thiourea environments. The longest gene activity stage of BT1 was observed in the high-thiourea environments by RNA sequencing, and genes related to maintaining intracellular copper homeostasis were highly expressed during the S metabolism process, which may be the key to restoring the ammonia nitrogen removal ability. Enzymes detected during the N and S cycles showed that BT1 reacts with thiourea to produce hydrogen but not sulphate, suggesting that BT1 may have genes that are involved in thiourea hydrolysis. In conclusion, the high-quality assembly of BT1 provides a valuable resource for analyzing its biological process and molecular mechanisms for thiourea metabolism. BT1 shows great application potential for the removal of thiourea from sewage treatment plants.
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Affiliation(s)
- Jingxuan Deng
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, People's Republic of China
- Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi, People's Republic of China
| | - Zhenxing Huang
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, People's Republic of China
- Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi, People's Republic of China
| | - Wenquan Ruan
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, People's Republic of China
- Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi, People's Republic of China
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2
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Wang Z, Vishwanathan N, Kowaliczko S, Ishii S. Clarifying Microbial Nitrous Oxide Reduction under Aerobic Conditions: Tolerant, Intolerant, and Sensitive. Microbiol Spectr 2023; 11:e0470922. [PMID: 36926990 PMCID: PMC10100939 DOI: 10.1128/spectrum.04709-22] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 11/17/2022] [Accepted: 02/18/2023] [Indexed: 03/17/2023] Open
Abstract
One of the major challenges for the bioremediation application of microbial nitrous oxide (N2O) reduction is its oxygen sensitivity. While a few strains were reported capable of reducing N2O under aerobic conditions, the N2O reduction kinetics of phylogenetically diverse N2O reducers are not well understood. Here, we analyzed and compared the kinetics of clade I and clade II N2O-reducing bacteria in the presence or absence of oxygen (O2) by using a whole-cell assay with N2O and O2 microsensors. Among the seven strains tested, N2O reduction of Stutzerimonas stutzeri TR2 and ZoBell was not inhibited by oxygen (i.e., oxygen tolerant). Paracoccus denitrificans, Azospirillum brasilense, and Gemmatimonas aurantiaca reduced N2O in the presence of O2 but slower than in the absence of O2 (i.e., oxygen sensitive). N2O reduction of Pseudomonas aeruginosa and Dechloromonas aromatica did not occur when O2 was present (i.e., oxygen intolerant). Amino acid sequences and predicted structures of NosZ were highly similar among these strains, whereas oxygen-tolerant N2O reducers had higher oxygen consumption rates. The results suggest that the mechanism of O2 tolerance is not directly related to NosZ structure but is rather related to the scavenging of O2 in the cells and/or accessory proteins encoded by the nos cluster. IMPORTANCE Some bacteria can reduce N2O in the presence of O2, whereas others cannot. It is unclear whether this trait of aerobic N2O reduction is related to the phylogeny and structure of N2O reductase. The understanding of aerobic N2O reduction is critical for guiding emission control, due to the common concurrence of N2O and O2 in natural and engineered systems. This study provided the N2O reduction kinetics of various bacteria under aerobic and anaerobic conditions and classified the bacteria into oxygen-tolerant, -sensitive, and -intolerant N2O reducers. Oxygen-tolerant N2O reducers rapidly consumed O2, which could help maintain the low O2 concentration in the cells and keep their N2O reductase active. These findings are important and useful when selecting N2O reducers for bioremediation applications.
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Affiliation(s)
- Zhiyue Wang
- Department of Civil and Environmental Engineering, University of Hawai'i, Honolulu, Hawai'i, USA
- Water Resources Research Center, University of Hawai'i, Honolulu, Hawai'i, USA
| | - Nisha Vishwanathan
- BioTechnology Institute, University of Minnesota, St. Paul, Minnesota, USA
| | - Sophie Kowaliczko
- BioTechnology Institute, University of Minnesota, St. Paul, Minnesota, USA
| | - Satoshi Ishii
- BioTechnology Institute, University of Minnesota, St. Paul, Minnesota, USA
- Department of Soil, Water, and Climate, University of Minnesota, St. Paul, Minnesota, USA
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Insight into the Cold Adaptation Mechanism of an Aerobic Denitrifying Bacterium: Bacillus simplex H-b. Appl Environ Microbiol 2023; 89:e0192822. [PMID: 36656033 PMCID: PMC9972999 DOI: 10.1128/aem.01928-22] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 01/20/2023] Open
Abstract
Psychrophilic bacteria with aerobic denitrification ability have promising potential for application in nitrogen-contaminated wastewater treatment, especially under cold conditions. A better understanding of the cold adaptation mechanism during aerobic denitrification would be beneficial for the practical application of this type of functional bacterium. In this study, Bacillus simplex H-b with good denitrification performance at 5°C was used to investigate the corresponding cold tolerance mechanism. Transcriptomics and nitrogen removal characterization experiments were conducted at different temperatures (5°C, 20°C, and 30°C). At low temperatures, more nitrogen was utilized for assimilation, accompanied by the accumulation of ATP and extracellular polymeric substances (EPS), rather than transforming inorganic nitrogen in the dissimilation pathway. In addition, the proportion of unsaturated fatty acids was higher in strains cultured at low temperatures. At the molecular level, the adjustment of membrane transport, synthesis of cofactors and vitamins, and transcriptional regulators might contribute to the survival of the strain under cold conditions. Moreover, nucleotide precursor synthesis, translation, and oxidative and temperature stress response mechanisms also enhanced the resistance of strain H-b to low temperatures. The results suggest that combining multiple regulatory mechanisms and synergistic adaptation to cold stress enabled the growth and relatively high nitrogen removal rate (27.22%) of strain H-b at 5°C. By clarifying the mechanism of regulation and cold resistance of strain H-b, a theoretical foundation for enhancing the application potential of this functional bacterium for nitrogen-contaminated wastewater treatment was provided. IMPORTANCE The newly isolated aerobic denitrifying bacterium Bacillus simplex H-b removed various forms of inorganic nitrogen (nitrate, nitrite, and ammonium) from wastewater, even when the temperature was as low as 5°C. Although this environmentally functional bacterium has been suggested as a promising candidate for nitrogen-contaminated water treatment at low temperatures, understanding its cold adaptation mechanism during aerobic denitrification is limited. In this study, the cold tolerance mechanism of this strain was comprehensively explained. Furthermore, a theoretical basis for the practical application of this type of functional bacterium for nitrogen removal in cold regions is provided. The study expands our understanding of the survival strategy of psychrophilic bacteria and hence supports their further utilization in wastewater treatment applications.
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Deng J, Huang Z, Wang J, Shan X, Shi W, Ruan W. Wild Heterotrophic Nitrifying Strain Pseudomonas BT1 Isolated from Kitchen Waste Sludge Restores Ammonia Nitrogen Removal in a Sewage Treatment Plant Shocked by Thiourea. Appl Biochem Biotechnol 2022; 194:2901-2918. [PMID: 35294734 PMCID: PMC9205789 DOI: 10.1007/s12010-022-03850-7] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/18/2021] [Accepted: 02/11/2022] [Indexed: 11/27/2022]
Abstract
Thiourea is used in agriculture and industry as a metal scavenger, synthetic intermediate, and nitrification inhibitor. However, in wastewater, it can inhibit the nitrification process and induce the collapse of the nitrification system. In such a case, ammonia-oxidizing bacteria (AOB) lose their ability to remove ammonia. We investigated the nitrification system of a 60,000-t/d municipal sewage treatment plant in Nanjing, which collapsed after receiving 5–15 ppm (5–15 mg/L) thiourea. Ammonia nitrogen removal quickly recovered to more than 95% after inoculation with 10 t high-efficiency nitrification sludge, which was collected from a kitchen waste treatment plant. A heterotrophic nitrification strain was isolated from the inoculated sludge and identified as wild Pseudomonas by 16S rDNA sequencing and named “BT1.” Based on thiourea tolerance tests, BT1 can tolerate a thiourea content of more than 500 ppm. For comparison, the in situ process was imitated by the simulation system, and the wastewater shocked by 10 ppm thiourea could still meet the emission standard after adding 1% (V/V) BT1. High-throughput sequencing analysis was applied to study microbial succession during thiourea shock loading. The results showed that Hydrogenophaga and Thiobacillus grew with the growth of BT1. Pseudomonas BT1 was used for a 6,000-t/d printed circuit board (PCB) wastewater treatment system, the nitrification system returned to normal in 15 days, and the degradation rate stabilized at more than 95%.
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Affiliation(s)
- Jingxuan Deng
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, China
- Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Zhenxing Huang
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, China
- Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Jinbo Wang
- JiangNing Water Group Co., Ltd, Nanjing, 211100, China
| | - Xiaohong Shan
- Wuxi MaSun Environmental Energy Technology Co., Ltd, Wuxi, 214122, China
| | - Wansheng Shi
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, China
- Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi, 214122, China
| | - Wenquan Ruan
- School of Environment and Civil Engineering, Jiangnan University, Wuxi, 214122, China.
- Jiangsu Key Laboratory of Anaerobic Biotechnology, Jiangnan University, Wuxi, 214122, China.
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5
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Nwankwegu AS, Zhang L, Xie D, Onwosi CO, Muhammad WI, Odoh CK, Sam K, Idenyi JN. Bioaugmentation as a green technology for hydrocarbon pollution remediation. Problems and prospects. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2022; 304:114313. [PMID: 34942548 DOI: 10.1016/j.jenvman.2021.114313] [Citation(s) in RCA: 27] [Impact Index Per Article: 13.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/08/2021] [Revised: 10/26/2021] [Accepted: 12/13/2021] [Indexed: 06/14/2023]
Abstract
Environmental pollution mitigation measure involving bioremediation technology is a sustainable intervention for a greener ecosystem biorecovery, especially the obnoxious hydrocarbons, xenobiotics, and other environmental pollutants induced by anthropogenic stressors. Several successful case studies have provided evidence to this paradigm including the putative adoption that the technology is eco-friendly, cost-effective, and shows a high tendency for total contaminants mineralization into innocuous bye-products. The present review reports advances in bioremediation, types, and strategies conventionally adopted in contaminant clean-up. It identified that natural attenuation and biostimulation are faced with notable limitations including the poor remedial outcome under the natural attenuation system and the residual contamination occasion following a biostimulation operation. It remarks that the use of genetically engineered microorganisms shows a potentially promising insight as a prudent remedial approach but is currently challenged by few ethical restrictions and the rural unavailability of the technology. It underscores that bioaugmentation, particularly the use of high cell density assemblages referred to as microbial consortia possess promising remedial prospects thus offers a more sustainable environmental security. The authors, therefore, recommend bioaugmentation for large scale contaminated sites in regions where environmental degradation is commonplace.
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Affiliation(s)
- Amechi S Nwankwegu
- College of Resources and Environment, Southwest University, 1 Tiansheng Road, Beibei District, Chongqing, 400716, China; Organization of African Academic Doctors, Off Kamiti Road, P.O. Box 25305-00100, Nairobi, Kenya.
| | - Lei Zhang
- College of Resources and Environment, Southwest University, 1 Tiansheng Road, Beibei District, Chongqing, 400716, China
| | - Deti Xie
- College of Resources and Environment, Southwest University, 1 Tiansheng Road, Beibei District, Chongqing, 400716, China
| | - Chukwudi O Onwosi
- Department of Microbiology, Faculty of Biological Sciences, University of Nigeria, Nsukka, Enugu State, Nigeria
| | - Wada I Muhammad
- Organization of African Academic Doctors, Off Kamiti Road, P.O. Box 25305-00100, Nairobi, Kenya; College of Water Conservancy, Hohai University, No.1 Xikang Road, Gulou District, Nanjing, 210098, China
| | - Chuks K Odoh
- Organization of African Academic Doctors, Off Kamiti Road, P.O. Box 25305-00100, Nairobi, Kenya; Dalian Institute of Chemical Physics, Chinese Academy of Sciences, Beijing, China
| | - Kabari Sam
- Faculty of Environmental Management, Department of Marine Environment and Pollution Control, Nigeria Maritime University, Okerenkoko, Delta State, Nigeria
| | - John N Idenyi
- Department of Biotechnology, Ebonyi State University Abakaliki, Nigeria
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6
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Ma H, Zhao Y, Yang K, Wang Y, Zhang C, Ji M. Application oriented bioaugmentation processes: Mechanism, performance improvement and scale-up. BIORESOURCE TECHNOLOGY 2022; 344:126192. [PMID: 34710609 DOI: 10.1016/j.biortech.2021.126192] [Citation(s) in RCA: 16] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/04/2021] [Revised: 10/18/2021] [Accepted: 10/19/2021] [Indexed: 06/13/2023]
Abstract
Bioaugmentation is an optimization method with great potential to improve the treatment effect by introducing specific strains into the biological treatment system. In this study, a comprehensive review of the mechanism of bioaugmentation from the aspect of microbial community structure, the optimization methods facilitating application as well as feasible approaches of scale-up application has been provided. The different contribution of indigenous and exogenous strains was critically analyzed, the relationship between microbial community variation and system performance was clarified. Operation regulation and immobilization technologies are effective methods to deal with the possible failure of bioaugmentation. The gradual expansion from lab-scale, pilot scale to full-scale, the transformation and upgrading of wastewater treatment plants through the combination of direct dosing and biofilm, and the application of side-stream reactors are feasible ways to realize the full-scale application. The future challenges and prospects in this field were also proposed.
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Affiliation(s)
- Huilin Ma
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Yingxin Zhao
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China.
| | - Kaichao Yang
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Yue Wang
- School of Environmental Science and Engineering, Tiangong University, Tianjin 300387, China
| | - Chenggong Zhang
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
| | - Min Ji
- School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China
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7
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Janiak K, Zięba B, Szetela R, Muszyński-Huhajło M, Miodoński S, Jurga A, Trusz A. Approach to modeling protozoa grazing on the basis of the current state of knowledge. Ecol Modell 2021. [DOI: 10.1016/j.ecolmodel.2021.109503] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
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8
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Xiong F, Zhao X, Wen D, Li Q. Effects of N-acyl-homoserine lactones-based quorum sensing on biofilm formation, sludge characteristics, and bacterial community during the start-up of bioaugmented reactors. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 735:139449. [PMID: 32473427 DOI: 10.1016/j.scitotenv.2020.139449] [Citation(s) in RCA: 23] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/20/2020] [Revised: 05/11/2020] [Accepted: 05/12/2020] [Indexed: 06/11/2023]
Abstract
Bioaugmentation is an effective technology for treating wastewater containing recalcitrant organic pollutants. However, it is restricted by several technical problems, including the difficult colonization and survival of the inoculated bacteria, and the time-consuming start-up process. Considering the important roles of quorum sensing (QS) in regulating microbial behaviors, this study investigated the effects of N-acyl-homoserine lactones (AHLs)-based manipulation on the start-up of biofilm reactors bioaugmented with a pyridine-degrading strain Paracoccus sp. BW001. The results showed that, in the presence of two specific exogenous AHLs (C6-HSL and 3OC6-HSL), the biofilm formation process on carriers was significantly accelerated, producing thick and structured biofilms. The protein and polysaccharide contents of the extracellular polymeric substances (EPS) and soluble microbial products (SMP) in sludge were also elevated, possibly due to the increased abundance of several EPS-producing bacterial genera. Specifically, the stability and complexity of protein structures were improved. Besides the reactor running time, the AHL-manipulation was proved to be the main factor that drove the shift of bacterial community structures in the reactors. The addition of exogenous AHLs significantly increased the succession rate of bacterial communities and decreased the bacterial alpha diversity. Most importantly, the final proportions of the inoculated strain BW001 were elevated by nearly 100% in both sludge and biofilm communities via the AHL-manipulation. These findings strongly elucidated that AHL-based QS was deeply involved in biofilm formation, sludge characteristics, and microbial community construction in bioaugmented reactors, providing a promising start-up strategy for bioaugmentation technology.
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Affiliation(s)
- Fuzhong Xiong
- College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
| | - Xiaoxi Zhao
- College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
| | - Donghui Wen
- College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.
| | - Qilin Li
- Department of Civil and Environmental Engineering, Rice University, Houston, TX 77005, USA
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9
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Suenaga T, Hori T, Riya S, Hosomi M, Smets BF, Terada A. Enrichment, Isolation, and Characterization of High-Affinity N 2O-Reducing Bacteria in a Gas-Permeable Membrane Reactor. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2019; 53:12101-12112. [PMID: 31517481 DOI: 10.1021/acs.est.9b02237] [Citation(s) in RCA: 29] [Impact Index Per Article: 5.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/10/2023]
Abstract
The recent discovery of nitrous oxide (N2O)-reducing bacteria suggests a potential biological sink for the potent greenhouse gas N2O. For an application toward N2O mitigation, characterization of more isolates will be required. Here, we describe the successful enrichment and isolation of high-affinity N2O-reducing bacteria using a N2O-fed reactor (N2OFR). Two N2OFRs, where N2O was continuously and directly supplied as the sole electron acceptor to a biofilm grown on a gas-permeable membrane, were operated with acetate or a mixture of peptone-based organic substrates as an electron donor. In parallel, a NO3- -fed reactor (NO3FR), filled with a nonwoven sheet substratum, was operated using the same inoculum. We hypothesized that supplying N2O vs NO3- would enhance the dominance of distinct N2O-reducing bacteria. Clade II type nosZ bacteria became rapidly enriched over clade I type nosZ bacteria in the N2OFRs, whereas the opposite held in the NO3FR. High-throughput sequencing of 16S rRNA gene amplicons revealed the dominance of Rhodocyclaceae in the N2OFRs. Strains of the Azospira and Dechloromonas genera, canonical denitrifiers harboring clade II type nosZ, were isolated with high frequency from the N2OFRs (132 out of 152 isolates). The isolates from the N2OFR demonstrated higher N2O uptake rates (Vmax: 4.23 × 10-3-1.80 × 10-2 pmol/h/cell) and lower N2O half-saturation coefficients (Km,N2O: 1.55-2.10 μM) than a clade I type nosZ isolate from the NO3FR. Furthermore, the clade II type nosZ isolates had higher specific growth rates on N2O than nitrite as an electron acceptor. Hence, continuously and exclusively supplying N2O in an N2OFR allows the enrichment and isolation of high-affinity N2O-reducing strains, which may be used as N2O sinks in bioaugmentation efforts.
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Affiliation(s)
- Toshikazu Suenaga
- Department of Chemical Engineering , Tokyo University of Agriculture and Technology , 2-24-16 Naka-cho , Koganei , Tokyo 184-8588 , Japan
- Institute of Global Innovation Research , Tokyo University of Agriculture and Technology , 3-8-1 Harumi-cho , Fuchu , Tokyo 185-8538 , Japan
| | - Tomoyuki Hori
- Environmental Management Research Institute , National Institute of Advanced Industrial Science and Technology (AIST) , Onogawa 16-1 , Tsukuba , Ibaraki 305-8569 , Japan
| | - Shohei Riya
- Department of Chemical Engineering , Tokyo University of Agriculture and Technology , 2-24-16 Naka-cho , Koganei , Tokyo 184-8588 , Japan
- Institute of Global Innovation Research , Tokyo University of Agriculture and Technology , 3-8-1 Harumi-cho , Fuchu , Tokyo 185-8538 , Japan
| | - Masaaki Hosomi
- Department of Chemical Engineering , Tokyo University of Agriculture and Technology , 2-24-16 Naka-cho , Koganei , Tokyo 184-8588 , Japan
| | - Barth F Smets
- Institute of Global Innovation Research , Tokyo University of Agriculture and Technology , 3-8-1 Harumi-cho , Fuchu , Tokyo 185-8538 , Japan
- Department of Environmental Engineering , Technical University of Denmark , Miljoevej, Lyngby 2800 , Denmark
| | - Akihiko Terada
- Department of Chemical Engineering , Tokyo University of Agriculture and Technology , 2-24-16 Naka-cho , Koganei , Tokyo 184-8588 , Japan
- Institute of Global Innovation Research , Tokyo University of Agriculture and Technology , 3-8-1 Harumi-cho , Fuchu , Tokyo 185-8538 , Japan
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10
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Evaluation of the Nitrous Oxide Emission Reduction Potential of an Aerobic Bioreactor Packed with Carbon Fibres for Swine Wastewater Treatment. ENERGIES 2019. [DOI: 10.3390/en12061013] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 11/16/2022]
Abstract
Nitrous oxide (N2O) is a potent greenhouse gas that is emitted from wastewater treatment plants. To reduce emissions of N2O from swine wastewater treatment plants, we constructed an experimental aerobic bioreactor packed with carbon fibres (ca. 1 m3 bioreactor) as an alternative to conventional activated sludge treatment. The N2O emission factor for the aerobic bioreactor packed with carbon fibres (CF) was 0.002 g N2O-N/g TN-load and the value for the typical activated sludge (AS) reactor was 0.013 g N2O-N/g TN-load. The CF treatment method achieved more than 80% reduction of N2O emissions, compared with the AS treatment method. The experimental introduction of a CF carrier into an actual wastewater treatment plant also resulted in a large reduction in N2O generation. Specifically, the N2O emission factors decreased from 0.040 to 0.005 g N2O-N/g TN-load following application of the carrier. This shows that it is possible to reduce N2O generation by more than 80% by using a CF carrier during the operation of an actual wastewater treatment plant. Some bacteria from the phylum Chloroflexi, which are capable of reducing N2O emissions, were detected at a higher frequency in the biofilm on the CF carrier than in the biofilm formed on the AS reactor.
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Boonnorat J, Techkarnjanaruk S, Honda R, Ghimire A, Angthong S, Rojviroon T, Phanwilai S. Enhanced micropollutant biodegradation and assessment of nitrous oxide concentration reduction in wastewater treated by acclimatized sludge bioaugmentation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2018; 637-638:771-779. [PMID: 29758432 DOI: 10.1016/j.scitotenv.2018.05.066] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/09/2018] [Revised: 05/05/2018] [Accepted: 05/05/2018] [Indexed: 06/08/2023]
Abstract
This research investigated the micropollutant biodegradation and nitrous oxide (N2O) concentration reduction in high strength wastewater treated by two-stage activated sludge (AS) systems with (bioaugmented) and without (non-bioaugmented) acclimatized sludge bioaugmentation. The bioaugmented and non-bioaugmented systems were operated in parallel for 228 days, with three levels of concentrations of organics, nitrogen, and micropollutants in the influent: conditions 1 (low), 2 (moderate), and 3 (high). The results showed that, under condition 1, both systems efficiently removed the organic and nitrogen compounds. However, the bioaugmented system was more effective in the micropollutant biodegradation and N2O concentration reduction than the non-bioaugmented one. Under condition 2, the nitrogen and micropollutant biodegradation efficiency of the non-bioaugmented system slightly decreased, while the N2O concentration declined in the bioaugmented system. Under condition 3, the treatment performance and N2O concentration abatement were substantially lowered as the compounds concentration increased. Further analysis also showed that the acclimatized sludge bioaugmentation increased the bacterial diversity in the system. In essence, the acclimatized sludge bioaugmentation strategy was highly effective for the influent with low compounds concentration, achieving the organics and nitrogen removal efficiencies of 92-97%, relative to 71-97% of the non-bioaugmented system. The micropollutant treatment efficiency of the bioaugmented system under condition 1 was 75-92%, indicating significant improvement in the treatment performance (p < 0.05), compared with 60-79% of the non-bioaugmented system.
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Affiliation(s)
- Jarungwit Boonnorat
- Environmental Engineering Program, Faculty of Engineering, Rajamangala University of Technology Thanyaburi (RMUTT), Klong 6, Pathum Thani 12110, Thailand.
| | - Somkiet Techkarnjanaruk
- Excellent Center of Waste Utilization and Management (ECoWaste), King Mongkut's University of Technology Thonburi (KMUTT), Bangkhuntien, Bangkok 10150, Thailand; National Center for Genetic Engineering and Biotechnology (BIOTEC), National Science and Technology Development Agency (NSTDA), Pathum Thani 12120, Thailand
| | - Ryo Honda
- Faculty of Geosciences and Civil Engineering, Kanazawa University, Kakuma-machi, Kanazawa 920-1192, Japan
| | - Anish Ghimire
- Center for Postgraduate Studies, Nepal Engineering College, Lagankhel, Lalitpur, Nepal
| | - Sivakorn Angthong
- Department of Industrial Engineering, Faculty of Engineering, Rajamangala University of Technology Thanyaburi (RMUTT), Klong 6, Pathum Thani 12110, Thailand
| | - Thammasak Rojviroon
- Environmental Engineering Program, Faculty of Engineering, Rajamangala University of Technology Thanyaburi (RMUTT), Klong 6, Pathum Thani 12110, Thailand
| | - Supaporn Phanwilai
- Department of Environmental Engineering, Faculty of Engineering, Kasetsart University, Bangkok 10900, Thailand
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12
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Immobilization of Azospira sp. strain I13 by gel entrapment for mitigation of N2O from biological wastewater treatment plants: Biokinetic characterization and modeling. J Biosci Bioeng 2018; 126:213-219. [DOI: 10.1016/j.jbiosc.2018.02.014] [Citation(s) in RCA: 7] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/19/2017] [Revised: 02/13/2018] [Accepted: 02/18/2018] [Indexed: 11/23/2022]
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13
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Roohian H, Mehranbod N. Investigation of bio-augmentation of overloaded activated sludge plant operation by computer simulation. Comput Chem Eng 2017. [DOI: 10.1016/j.compchemeng.2017.04.004] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/19/2022]
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Chen Y, Lan S, Wang L, Dong S, Zhou H, Tan Z, Li X. A review: Driving factors and regulation strategies of microbial community structure and dynamics in wastewater treatment systems. CHEMOSPHERE 2017; 174:173-182. [PMID: 28161518 DOI: 10.1016/j.chemosphere.2017.01.129] [Citation(s) in RCA: 74] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/14/2016] [Revised: 01/24/2017] [Accepted: 01/25/2017] [Indexed: 06/06/2023]
Abstract
The performance and stabilization of biological wastewater treatment systems 1are closely related to the microbial community structure and dynamics. In this paper, the effects and mechanisms of influent composition, process configuration, operating parameters (dissolved oxygen [DO], pH, hydraulic retention time [HRT] and sludge retention time [SRT]) and environmental condition (temperature) to the change of microbial community structure and process performance (nitrification, denitrification, biological phosphorus removal, organics mineralization and utilization, etc.) are critically reviewed. Furthermore, some strategies for microbial community structure regulation, mainly bioaugmentation, process adjustment and operating parameters optimization, applied in the current wastewater treatment systems are also discussed. Although the recent studies have strengthened our understanding on the relationship between microbial community structure and wastewater treatment process performance, how to fully tap the microbial information, optimize the microbial community structure and maintain the process performance in wastewater treatment systems are still full of challenges.
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Affiliation(s)
- Yangwu Chen
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China; University of Chinese Academy of Sciences, 100049, Beijing, PR China
| | - Shuhuan Lan
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China
| | - Longhui Wang
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China
| | - Shiyang Dong
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China; University of Chinese Academy of Sciences, 100049, Beijing, PR China
| | - Houzhen Zhou
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China
| | - Zhouliang Tan
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China.
| | - Xudong Li
- Key Laboratory of Environmental and Applied Microbiology, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China; Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, 610041, Chengdu, PR China
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Read-Daily BL, Sabba F, Pavissich JP, Nerenberg R. Kinetics of nitrous oxide (N 2O) formation and reduction by Paracoccus pantotrophus. AMB Express 2016; 6:85. [PMID: 27699705 PMCID: PMC5047877 DOI: 10.1186/s13568-016-0258-0] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/27/2016] [Accepted: 09/24/2016] [Indexed: 11/10/2022] Open
Abstract
Nitrous oxide (N2O) is a powerful greenhouse gas emitted from wastewater treatment, as well as natural systems, as a result of biological nitrification and denitrification. While denitrifying bacteria can be a significant source of N2O, they can also reduce N2O to N2. More information on the kinetics of N2O formation and reduction by denitrifying bacteria is needed to predict and quantify their impact on N2O emissions. In this study, kinetic parameters were determined for Paracoccus pantotrophus, a common denitrifying bacterium. Parameters included the maximum specific reduction rates, [Formula: see text], growth rates, [Formula: see text], and yields, Y, for reduction of NO3- (nitrate) to nitrite (NO2-), NO2- to N2O, and N2O to N2, with acetate as the electron donor. The [Formula: see text] values were 2.9 gN gCOD-1 d-1 for NO3- to NO2-, 1.4 gN gCOD-1 d-1 for NO2- to N2O, and 5.3 gN gCOD-1 d-1 for N2O to N2. The [Formula: see text] values were 2.7, 0.93, and 1.5 d-1, respectively. When N2O and NO3- were added concurrently, the apparent (extant) kinetics, [Formula: see text], assuming reduction to N2, were 6.3 gCOD gCOD-1 d-1, compared to 5.4 gCOD gCOD-1 d-1 for NO3- as the sole added acceptor. The [Formula: see text] was 1.6 d-1, compared to 2.5 d-1 for NO3- alone. These results suggest that NO3- and N2O were reduced concurrently. Based on this research, denitrifying bacteria like P. pantotrophus may serve as a significant sink for N2O. With careful design and operation, treatment plants can use denitrifying bacteria to minimize N2O emissions.
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Ardiansyah A, Fotedar R. The abundance and diversity of heterotrophic bacteria as a function of harvesting frequency of duckweed (Lemna minor
L.) in recirculating aquaculture systems. Lett Appl Microbiol 2016; 63:53-9. [DOI: 10.1111/lam.12585] [Citation(s) in RCA: 8] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/03/2015] [Revised: 05/12/2016] [Accepted: 05/12/2016] [Indexed: 11/29/2022]
Affiliation(s)
- A. Ardiansyah
- Department of Environment and Agriculture; Curtin University; Perth WA Australia
- Agricultural Polytechnic State of Pangkep; Sulawesi Selatan Indonesia
| | - R. Fotedar
- Department of Environment and Agriculture; Curtin University; Perth WA Australia
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17
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Yang K, Ji B, Wang H, Zhang H, Zhang Q. Bio-augmentation as a tool for improving the modified sequencing batch biofilm reactor. J Biosci Bioeng 2014; 117:763-8. [DOI: 10.1016/j.jbiosc.2013.11.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/18/2013] [Revised: 11/06/2013] [Accepted: 11/06/2013] [Indexed: 10/25/2022]
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18
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Khannous L, Jrad M, Dammak M, Miladi R, Chaaben N, Khemakhem B, Gharsallah N, Fendri I. Isolation of a novel amylase and lipase-producing Pseudomonas luteola strain: study of amylase production conditions. Lipids Health Dis 2014; 13:9. [PMID: 24405763 PMCID: PMC3895763 DOI: 10.1186/1476-511x-13-9] [Citation(s) in RCA: 11] [Impact Index Per Article: 1.1] [Reference Citation Analysis] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/23/2013] [Accepted: 12/28/2013] [Indexed: 11/10/2022] Open
Abstract
An amylase and lipase producing bacterium (strain C2) was enriched and isolated from soil regularly contaminated with olive washing wastewater in Sfax, Tunisia. Cell was aerobic, mesophilic, Gram-negative, motile, non-sporulating bacterium, capable of growing optimally at pH 7 and 30°C and tolerated maximally 10% (W/V) NaCl. The predominant fatty acids were found to be C18:1ω7c (32.8%), C16:1ω7c (27.3%) and C16:0 (23.1%). Phylogenetic analysis of the 16S rRNA gene revealed that this strain belonging to the genus Pseudomonas. Strain C2 was found to be closely related to Pseudomonas luteola with more than 99% of similarity. Amylase optimization extraction was carried out using Box Behnken Design (BBD). Its maximal activity was found when the pH and temperature ranged from 5.5 to 6.5 and from 33 to 37°C, respectively. Under these conditions, amylase activity was found to be about 9.48 U/ml.
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Affiliation(s)
| | | | | | | | | | | | | | - Imen Fendri
- Faculté des Sciences de Sfax, Unité de recherche Toxicologie- Microbiologie Environnementale et Santé, Université de, Sfax, Tunisia.
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Wong BT, Lee DJ. Pseudomonas yangmingensis sp. nov., an alkaliphilic denitrifying species isolated from a hot spring. J Biosci Bioeng 2014; 117:71-4. [DOI: 10.1016/j.jbiosc.2013.06.006] [Citation(s) in RCA: 10] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/31/2013] [Revised: 05/25/2013] [Accepted: 06/05/2013] [Indexed: 10/26/2022]
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Ikeda-Ohtsubo W, Miyahara M, Yamada T, Watanabe A, Fushinobu S, Wakagi T, Shoun H, Miyauchi K, Endo G. Effectiveness of heat treatment to protect introduced denitrifying bacteria from eukaryotic predatory microorganisms in a pilot-scale bioreactor. J Biosci Bioeng 2013; 116:722-4. [DOI: 10.1016/j.jbiosc.2013.05.024] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/08/2013] [Revised: 04/16/2013] [Accepted: 05/15/2013] [Indexed: 11/16/2022]
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