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Pan X, Lin L, Cao X, Jing Z, Dong L, Zhai W. Response of microbial communities and biogeochemical cycling functions to sediment physicochemical properties and microplastic pollution under damming and water diversion projects. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 940:173209. [PMID: 38754501 DOI: 10.1016/j.scitotenv.2024.173209] [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: 03/03/2024] [Revised: 05/05/2024] [Accepted: 05/11/2024] [Indexed: 05/18/2024]
Abstract
Understanding the interactions among flow-sediment, microorganisms, and biogeochemical cycles is crucial for comprehending the ecological response mechanisms of dams and water diversion. This study focused on the spatial patterns of carbon, nitrogen, phosphorus, and sulfur (CNPS) cycle functional genes in the water resource for the middle route of the South-to-North Water Diversion Project in China, specifically the Danjiangkou Reservoir (comprising the Han and Dan reservoirs). The investigation incorporated sediment physicochemical properties and microplastic pollution. Numerous microbial species were identified, revealing that microbial communities demonstrated sensitivity to changes in sedimentary mud content. The communities exhibited greater β diversity due to finer sediment particles in the Han Reservoir (HR), whereas in the Dan Reservoir (DR), despite having higher sediment nutrient content and MPs pollution, did not display this pattern. Regarding the composition and structure of microbial communities, the study highlighted that sediment N and P content had a more significant influence compared to particle size and MPs. The quantitative microbial element cycling (QMEC) results confirmed the presence of extensive chemolithotrophic microbes and strong nitrogen cycle activity stemming from long-term water storage and diversion operations. The denitrification intensity in the HR surpassed that of the DR. Notably, near the pre-dam area, biological nitrogen fixation, phosphorus removal, and sulfur reduction exhibited noticeable increases. Dam construction refined sediment, fostering the growth of different biogeochemical cycling bacteria and increasing the abundance of CNPS cycling genes. Furthermore, the presence of MPs exhibited a positive correlation with S cycling genes and a negative correlation with C and N cycling genes. These findings suggest that variations in flow-sediment dynamics and MPs pollution have significant impact the biogeochemical cycle of the reservoir.
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Affiliation(s)
- Xiong Pan
- Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan 430010, China; Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan 430010, China; Innovation Team for Basin Water Environmental Protection and Governance of Changjiang Water Resources Commission, Wuhan 430010, China
| | - Li Lin
- Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan 430010, China; Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan 430010, China; Innovation Team for Basin Water Environmental Protection and Governance of Changjiang Water Resources Commission, Wuhan 430010, China.
| | - Xiaohuan Cao
- Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan 430010, China; Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan 430010, China
| | - Zheng Jing
- Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan 430010, China; Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan 430010, China; Innovation Team for Basin Water Environmental Protection and Governance of Changjiang Water Resources Commission, Wuhan 430010, China
| | - Lei Dong
- Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan 430010, China; Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan 430010, China; Innovation Team for Basin Water Environmental Protection and Governance of Changjiang Water Resources Commission, Wuhan 430010, China
| | - Wenliang Zhai
- Basin Water Environmental Research Department, Changjiang River Scientific Research Institute, Wuhan 430010, China; Key Lab of Basin Water Resource and Eco-Environmental Science in Hubei Province, Wuhan 430010, China
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Liang F, Wei S, Ji L, Yan S. A potential CO 2 carrier to improve the utilization of HCO 3- by plant-soil ecosystem for carbon sink enhancement. J Adv Res 2024:S2090-1232(24)00365-5. [PMID: 39154803 DOI: 10.1016/j.jare.2024.08.022] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2024] [Revised: 07/19/2024] [Accepted: 08/15/2024] [Indexed: 08/20/2024] Open
Abstract
INTRODUCTION Improving the rhizospheric HCO3- utilization of plant-soil ecosystem could increase the carbon sink effect of terrestrial ecosystem. However, to avoid its physiological stress on the crop growth, the dosage of HCO3- allowed to add into the rhizosphere soil was always low (i.e., <5-20 mol/m3). OBJECTIVES To facilitate the utilization of relatively high concentrations of HCO3- by plants in the pursuit of achieving terrestrial carbon sink enhancement. METHODS In this study, the feasibility of directly supplementing a high concentration HCO3- carried by the biogas slurry to the plant rhizosphere was investigated using the tomato as a model plant. RESULTS The CO2-rich biogas slurry was verified as a potential CO2 carrier to increase the rhizospheric HCO3- concentration to 36 mol/m3 without causing a physiological stress. About 88.3 % of HCO3- carried by biogas slurry was successfully fixed by tomato-soil ecosystem, in which 43.8 % of HCO3- was assimilated by tomato roots for the metabolism, 0.5 ‰ of HCO3- was used by microorganisms for substances synthesis of cell structure through dark fixation, and 44.4 % of HCO3- was retained in the soil. The rest of HCO3- (∼11.7 %) might escape into the atmosphere through the reaction with H+. Correspondingly, the carbon fixation of tomato-soil ecosystem increased by 150.1 g-CO2/m2-soil during a tomato growth cycle. As for the global countries that would adopt the strategy proposed in this study to cultivate the tomato, an extra carbon sink of soil with about 1031.1 kt-C per year (i.e., an additional 0.21 tons of carbon per hectare soil) could be obtained. CONCLUSION This would be consistent with the goal of soil carbon sink enhancement launched at COP21. Furthermore, the regions with low GDP per capita may easily achieve a high reduction potential of CO2 emissions from the agricultural land after adopting the irrigation of CO2-rich biogas slurry.
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Affiliation(s)
- Feihong Liang
- Technology & Equipment Center for Carbon Neutrality in Agriculture, College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China; College of Life Science, Yulin University, Yilin 719000, PR China; Division of Soil and Water Management, Department of Earth and Environmental Sciences, KU Leuven, Kasteelpark Arenberg 20, B-3001 Leuven, Belgium
| | - Shihui Wei
- Technology & Equipment Center for Carbon Neutrality in Agriculture, College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Long Ji
- Technology & Equipment Center for Carbon Neutrality in Agriculture, College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China
| | - Shuiping Yan
- Technology & Equipment Center for Carbon Neutrality in Agriculture, College of Engineering, Huazhong Agricultural University, Wuhan 430070, PR China.
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Pincam T, Liu YQ, Booth A, Wang Y, Lan G, Zeng P. A comprehensive comparison of microbial communities between aerobic granular sludge and flocculent sludge for nutrient removal in full-scale wastewater treatment plants. CHEMOSPHERE 2024; 362:142644. [PMID: 38901698 DOI: 10.1016/j.chemosphere.2024.142644] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/20/2023] [Revised: 05/21/2024] [Accepted: 06/16/2024] [Indexed: 06/22/2024]
Abstract
Understanding the microbial community structure of sludge is crucial for improving the design, operation and optimisation of full-scale wastewater treatment plants (WWTPs). This study aimed to have a comprehensive comparison of microbial communities between aerobic granular sludge and flocculent sludge from two full-scale sequential batch reactors-based WWTPs with nutrient removal for the first time. To better understand key functional bacteria such as polyphosphate accumulating bacteria (PAOs), competitive bacteria such as glycogen accumulating bacteria (GAOs) and nitrifying bacteria for both nitrogen and phosphorus removal, another two full-scale WWTPs with only carbon (C) removal and C and nitrogen (N) removal were compared too. It was found that the richness and diversity of the microbial population in sludge increased with pollutant removal from only C, C and N, to C,N, P removal. For C, N P removal, granule structure led to a more diverse and rich microbial community structure than flocculent structure. Although more abundant nitrifying bacteria were enriched in granular sludge than flocculent sludge, the abundance of total putative PAOs was equivalent. However, the most typical putative PAOs such as Tetrasphaera and Candidatus Accumulibacter seemed to be more correlated with biological phosphorus removal performance, which might be more proper to be used as an indication for P removal potential. The higher abundance of GAOs in flocculent sludge with better phosphorus removal performance might suggest that further investigation is needed to understand the functions of GAOs. In addition, the equivalent abundances of PAOs in the WWTPs with only C removal and with C, N, and P removal, respectively, indicate that many newly reported putative PAOs might not contribute to P removal. This study provides insight into the microbial communities and functional bacteria in aerobic granular sludge and flocculent sludge in full-scale SBRs, which can provide microbes-informed optimisation of reactor operation for better nutrient removal.
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Affiliation(s)
- Tararag Pincam
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, SO17 1BJ, UK
| | - Yong-Qiang Liu
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, SO17 1BJ, UK.
| | - Alexander Booth
- Faculty of Engineering and Physical Sciences, University of Southampton, Southampton, SO17 1BJ, UK
| | - Yi Wang
- School of Environmental and Municipal Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, China
| | - Guihong Lan
- College of Chemistry and Chemical Engineering, Southwest Petroleum University (SWPU), Chengdu, 610500, China
| | - Ping Zeng
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing, 100012, China
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Su X, Huang X, Zhang Y, Yang L, Wen T, Yang X, Zhu G, Zhang J, Tang Y, Li Z, Ding J, Li R, Pan J, Chen X, Huang F, Rillig MC, Zhu YG. Nitrifying niche in estuaries is expanded by the plastisphere. Nat Commun 2024; 15:5866. [PMID: 38997249 PMCID: PMC11245476 DOI: 10.1038/s41467-024-50200-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/14/2023] [Accepted: 07/02/2024] [Indexed: 07/14/2024] Open
Abstract
The estuarine plastisphere, a novel ecological habitat in the Anthropocene, has garnered global concerns. Recent geochemical evidence has pointed out its potential role in influencing nitrogen biogeochemistry. However, the biogeochemical significance of the plastisphere and its mechanisms regulating nitrogen cycling remain elusive. Using 15N- and 13C-labelling coupled with metagenomics and metatranscriptomics, here we unveil that the plastisphere likely acts as an underappreciated nitrifying niche in estuarine ecosystems, exhibiting a 0.9 ~ 12-fold higher activity of bacteria-mediated nitrification compared to surrounding seawater and other biofilms (stone, wood and glass biofilms). The shift of active nitrifiers from O2-sensitive nitrifiers in the seawater to nitrifiers with versatile metabolisms in the plastisphere, combined with the potential interspecific cooperation of nitrifying substrate exchange observed among the plastisphere nitrifiers, collectively results in the unique nitrifying niche. Our findings highlight the plastisphere as an emerging nitrifying niche in estuarine environment, and deepen the mechanistic understanding of its contribution to marine biogeochemistry.
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Affiliation(s)
- Xiaoxuan Su
- Key Laboratory of Urban Environment and Health, Ningbo Observation and Research Station, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
- Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control, CAS Haixi Industrial Technology Innovation Center in Beilun, Ningbo, China
- Interdisciplinary Research Center for Agriculture Green Development in Yangtze River Basin, Southwest University, Chongqing, 400715, China
| | - Xinrong Huang
- Key Laboratory of Urban Environment and Health, Ningbo Observation and Research Station, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
- Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control, CAS Haixi Industrial Technology Innovation Center in Beilun, Ningbo, China
- University of the Chinese Academy of Sciences, 19A Yuquan Road, 100049, Beijing, China
| | - Yiyue Zhang
- Key Laboratory of Urban Environment and Health, Ningbo Observation and Research Station, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
- Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control, CAS Haixi Industrial Technology Innovation Center in Beilun, Ningbo, China
| | - Leyang Yang
- Key Laboratory of Urban Environment and Health, Ningbo Observation and Research Station, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
- Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control, CAS Haixi Industrial Technology Innovation Center in Beilun, Ningbo, China
- University of the Chinese Academy of Sciences, 19A Yuquan Road, 100049, Beijing, China
| | - Teng Wen
- School of Geography, Nanjing Normal University, Nanjing, 210023, China
| | - Xiaoru Yang
- Key Laboratory of Urban Environment and Health, Ningbo Observation and Research Station, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
- Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control, CAS Haixi Industrial Technology Innovation Center in Beilun, Ningbo, China
- University of the Chinese Academy of Sciences, 19A Yuquan Road, 100049, Beijing, China
| | - Guibing Zhu
- University of the Chinese Academy of Sciences, 19A Yuquan Road, 100049, Beijing, China
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 100085, Beijing, China
| | - Jinbo Zhang
- School of Geography, Nanjing Normal University, Nanjing, 210023, China
- Liebig Centre for Agroecology and Climate Impact Research, Justus Liebig University, Gießen, Germany
| | - Yijia Tang
- School of Life and Environmental Sciences, The University of Sydney, Sydney, NSW, 2015, Australia
| | - Zhaolei Li
- Interdisciplinary Research Center for Agriculture Green Development in Yangtze River Basin, Southwest University, Chongqing, 400715, China
| | - Jing Ding
- School of Environmental and Material Engineering, Yantai University, Yantai, 264005, China
| | - Ruilong Li
- School of Marine Science, Guangxi University, Nanning, 530004, China
| | - Junliang Pan
- School of Electrical Engineering, Chongqing University, Chongqing, 400044, China
| | - Xinping Chen
- Interdisciplinary Research Center for Agriculture Green Development in Yangtze River Basin, Southwest University, Chongqing, 400715, China
| | - Fuyi Huang
- Key Laboratory of Urban Environment and Health, Ningbo Observation and Research Station, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China
- Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control, CAS Haixi Industrial Technology Innovation Center in Beilun, Ningbo, China
| | - Matthias C Rillig
- Freie Universität Berlin, Institute of Biology, Berlin, Germany
- Berlin-Brandenburg Institute of Advanced Biodiversity Research, Berlin, Germany
| | - Yong-Guan Zhu
- Key Laboratory of Urban Environment and Health, Ningbo Observation and Research Station, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen, China.
- Zhejiang Key Laboratory of Urban Environmental Processes and Pollution Control, CAS Haixi Industrial Technology Innovation Center in Beilun, Ningbo, China.
- University of the Chinese Academy of Sciences, 19A Yuquan Road, 100049, Beijing, China.
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, 100085, Beijing, China.
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Suarez C, Rosenqvist T, Dimitrova I, Sedlacek CJ, Modin O, Paul CJ, Hermansson M, Persson F. Biofilm colonization and succession in a full-scale partial nitritation-anammox moving bed biofilm reactor. MICROBIOME 2024; 12:51. [PMID: 38475926 DOI: 10.1186/s40168-024-01762-8] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/29/2023] [Accepted: 01/09/2024] [Indexed: 03/14/2024]
Abstract
BACKGROUND Partial nitritation-anammox (PNA) is a biological nitrogen removal process commonly used in wastewater treatment plants for the treatment of warm and nitrogen-rich sludge liquor from anaerobic digestion, often referred to as sidestream wastewater. In these systems, biofilms are frequently used to retain biomass with aerobic ammonia-oxidizing bacteria (AOB) and anammox bacteria, which together convert ammonium to nitrogen gas. Little is known about how these biofilm communities develop, and whether knowledge about the assembly of biofilms in natural communities can be applied to PNA biofilms. RESULTS We followed the start-up of a full-scale PNA moving bed biofilm reactor for 175 days using shotgun metagenomics. Environmental filtering likely restricted initial biofilm colonization, resulting in low phylogenetic diversity, with the initial microbial community comprised mainly of Proteobacteria. Facilitative priority effects allowed further biofilm colonization, with the growth of initial aerobic colonizers promoting the arrival and growth of anaerobic taxa like methanogens and anammox bacteria. Among the early colonizers were known 'oligotrophic' ammonia oxidizers including comammox Nitrospira and Nitrosomonas cluster 6a AOB. Increasing the nitrogen load in the bioreactor allowed colonization by 'copiotrophic' Nitrosomonas cluster 7 AOB and resulted in the exclusion of the initial ammonia- and nitrite oxidizers. CONCLUSIONS We show that complex dynamic processes occur in PNA microbial communities before a stable bioreactor process is achieved. The results of this study not only contribute to our knowledge about biofilm assembly and PNA bioreactor start-up but could also help guide strategies for the successful implementation of PNA bioreactors. Video Abstract.
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Affiliation(s)
- Carolina Suarez
- Division of Water Resources Engineering, Faculty of Engineering LTH, Lund University, Lund, Sweden.
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden.
| | - Tage Rosenqvist
- Division of Applied Microbiology, Department of Chemistry, Lund University, Lund, Sweden
| | | | - Christopher J Sedlacek
- Division of Microbial Ecology, Centre for Microbiology and Environmental Systems Science, University of Vienna, Vienna, Austria
| | - Oskar Modin
- Division of Water Environment Technology, Department of Architecture and Civil Engineering, Chalmers University of Technology, Gothenburg, Sweden
| | - Catherine J Paul
- Division of Water Resources Engineering, Faculty of Engineering LTH, Lund University, Lund, Sweden
- Division of Applied Microbiology, Department of Chemistry, Lund University, Lund, Sweden
| | - Malte Hermansson
- Department of Chemistry and Molecular Biology, University of Gothenburg, Gothenburg, Sweden
| | - Frank Persson
- Division of Water Environment Technology, Department of Architecture and Civil Engineering, Chalmers University of Technology, Gothenburg, Sweden
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Kong Z, Song Y, Xu M, Yang Y, Wang X, Ma H, Zhi Y, Shao Z, Chen L, Yuan Y, Liu F, Xu Y, Ni Q, Hu S, Chai H. Multi-media interaction improves the efficiency and stability of the bioretention system for stormwater runoff treatment. WATER RESEARCH 2024; 250:121017. [PMID: 38118254 DOI: 10.1016/j.watres.2023.121017] [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: 10/07/2023] [Revised: 11/21/2023] [Accepted: 12/11/2023] [Indexed: 12/22/2023]
Abstract
Bioretention systems are one of the most widely used stormwater control measures for urban runoff treatment. However, stable and effective dissolved nutrient treatment by bioretention systems is often challenged by complicated stormwater conditions. In this study, pyrite-only (PO), pyrite-biochar (PB), pyrite-woodchip (PW), and pyrite-woodchip-biochar mixed (M) bioretention systems were established to study the feasibility of improving both stability and efficiency in bioretention system via multi-media interaction. PB, PW, and M all showed enhanced dissolved nitrogen and/or phosphorus removal compared to PO, with M demonstrating the highest efficiency and stability under different antecedent drying durations (ADD), pollutant levels, and prolonged precipitation depth. The total dissolved nitrogen and dissolved phosphorus removal in M ranged between 64%-86% and 80%-95%, respectively, with limited organic matter and iron leaching. Pore water, microbial community, and material analysis collectively indicate that pyrite, woodchip, and biochar synergistically facilitated multiple nutrient treatment processes and protected each other against by-product leaching. Pyrite-woodchip interaction greatly increased nitrate removal by facilitating mixotrophic denitrification, while biochar further enhanced ammonium adsorption and expanded the denitrification area. The Fe3+ generated by pyrite aerobic oxidation was adsorbed on the biochar surface and potentially formed a Fe-biochar composite layer, which not only reduced Fe3+-induced pyrite excessive oxidation but also potentially increased organic matter adsorption. Fe (oxyhydr)oxides intermediate product formed by pyrite oxidation, in return, controlled the phosphorus and organic matter leaching from biochar and woodchip. Overall, this study demonstrates that multi-media interaction may enable bioretention systems to achieve stable and effective urban runoff treatment.
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Affiliation(s)
- Zheng Kong
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), College of Environment and Ecology, Chongqing University, Chongqing 400045, China; Australian Centre for Water and Environmental Biotechnology, The University of Queensland, St Lucia, QLD 4072, Australia
| | - Yunqian Song
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), College of Environment and Ecology, Chongqing University, Chongqing 400045, China; Australian Centre for Water and Environmental Biotechnology, The University of Queensland, St Lucia, QLD 4072, Australia
| | - Mei Xu
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), College of Environment and Ecology, Chongqing University, Chongqing 400045, China
| | - Yan Yang
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), College of Environment and Ecology, Chongqing University, Chongqing 400045, China; National Research Base of Intelligent Manufacturing Service, Chongqing Technology and Business University, Chongqing, 400067, China
| | - Xinyue Wang
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), College of Environment and Ecology, Chongqing University, Chongqing 400045, China
| | - Haiyuan Ma
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), College of Environment and Ecology, Chongqing University, Chongqing 400045, China
| | - Yue Zhi
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), College of Environment and Ecology, Chongqing University, Chongqing 400045, China
| | - Zhiyu Shao
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), College of Environment and Ecology, Chongqing University, Chongqing 400045, China
| | - Lei Chen
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), College of Environment and Ecology, Chongqing University, Chongqing 400045, China
| | - Yunsong Yuan
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), College of Environment and Ecology, Chongqing University, Chongqing 400045, China
| | - Fujian Liu
- China Construction Installation Group Co. LTD, Nanjing, 210023, China
| | - Yanhong Xu
- China Construction Installation Group Co. LTD, Nanjing, 210023, China
| | - Qichang Ni
- China Construction Installation Group Co. LTD, Nanjing, 210023, China
| | - Shihu Hu
- Australian Centre for Water and Environmental Biotechnology, The University of Queensland, St Lucia, QLD 4072, Australia
| | - Hongxiang Chai
- Key Laboratory of Eco-environments in Three Gorges Reservoir Region (Ministry of Education), College of Environment and Ecology, Chongqing University, Chongqing 400045, China.
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Endo Y, Fujitani H, Kaneko A, Ninomiya T, Umezawa C, Kuroiwa M, Suwa Y. Isolation of a Moderately Acidophilic Nitrobacter from a Nitrifying Community Supplied with Urea. Microbes Environ 2024; 39:ME24027. [PMID: 39284717 PMCID: PMC11427310 DOI: 10.1264/jsme2.me24027] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2024] [Accepted: 07/23/2024] [Indexed: 09/29/2024] Open
Abstract
Nitrite-oxidizing bacteria (NOB), which perform the second step of aerobic nitrification, play an important role in soil. In the present study, we report a novel isolate from agricultural soil affiliated with the genus Nitrobacter and its physiological characteristics. We sampled the surface soil of a vegetable field and obtained mixed culture A31 using the most probable number (MPN) method with inorganic medium containing 0.75 mM urea (pH 5.5). The dilution-extinction procedure on culture A31 led to the isolation of a strain that was designated as Nitrobacter sp. A67. The nxrB1 gene sequence of Nitrobacter sp. A67 (302 bp) was classified into Cluster 5, and the highest sequence identity was 96.10% with Nitrobacter sp. BS5/19. The NO2- oxidation activity of Nitrobacter sp. A67 was investigated at various pH. The optimum pH for NO2- oxidation was 5.8-6.4. This result indicates that Nitrobacter sp. A67 is a moderately acidophilic nitrite-oxidizing bacterium.
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Affiliation(s)
- Yuta Endo
- Department of Biological Sciences, Chuo University, Tokyo, Japan
| | | | - Ayano Kaneko
- Department of Biological Sciences, Chuo University, Tokyo, Japan
| | - Takuya Ninomiya
- Department of Biological Sciences, Chuo University, Tokyo, Japan
| | - Chiharu Umezawa
- Department of Biological Sciences, Chuo University, Tokyo, Japan
| | - Megumi Kuroiwa
- Department of Biological Sciences, Chuo University, Tokyo, Japan
| | - Yuichi Suwa
- Department of Biological Sciences, Chuo University, Tokyo, Japan
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Alfreider A, Harringer M. Vertical Distribution and Seasonal Patterns of Candidatus Nitrotoga in a Sub-Alpine Lake. Microbes Environ 2024; 39:ME23086. [PMID: 38825479 PMCID: PMC11220445 DOI: 10.1264/jsme2.me23086] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/25/2023] [Accepted: 03/01/2024] [Indexed: 06/04/2024] Open
Abstract
The nitrite oxidizing bacterial genus Ca. Nitrotoga was only recently discovered to be widespread in freshwater systems; however, limited information is currently available on the environmental factors and seasonal effects that influence its distribution in lakes. In a one-year study in a dimictic lake, based on monthly sampling along a vertical profile, the droplet digital PCR quantification of Ca. Nitrotoga showed a strong spatio-temporal patchiness. A correlation ana-lysis with environmental parameters revealed that the abundance of Ca. Nitrotoga correlated with dissolved oxygen and ammonium, suggesting that the upper hypolimnion of the lake is the preferred habitat.
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Affiliation(s)
- Albin Alfreider
- Department of Ecology, University of Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria
| | - Manuel Harringer
- Department of Ecology, University of Innsbruck, Technikerstrasse 25, 6020 Innsbruck, Austria
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9
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Li Y, Xiong L, Yu H, Zeng K, Wei Y, Li H, Zeng W, Ji X. Function and distribution of nitrogen-cycling microbial communities in the Napahai plateau wetland. Arch Microbiol 2023; 205:357. [PMID: 37872393 DOI: 10.1007/s00203-023-03695-6] [Citation(s) in RCA: 6] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/17/2023] [Revised: 09/27/2023] [Accepted: 09/29/2023] [Indexed: 10/25/2023]
Abstract
Nitrogen is an essential component of living organisms and a major nutrient that limits life on Earth. Until now, freely available nitrogen mainly comes from atmospheric nitrogen, but most organisms rely on bioavailable forms of nitrogen, which depends on the complex network of microorganisms with a wide variety of metabolic functions. Microbial-mediated nitrogen cycling contributes to the biogeochemical cycling of wetlands, but its specific microbial abundance, composition, and distribution need to be studied. Based on the metagenomic data, we described the composition and functional characteristics of microbial nitrogen cycle-related genes in the Napahai plateau wetland. Six nitrogen cycling pathways existed, such as dissimilatory nitrate reduction, denitrification, nitrogen fixation, nitrification, anammox, and nitrate assimilation. Most genes related to the nitrogen cycling in this region come from bacteria, mainly from Proteobacteria and Acidobacteria. Habitat types and nitrogen cycle-related genes largely explained the relative abundance of total nitrogen pathways. Phylogenetic trees were constructed based on nitrogen cycle-related genes from different habitats and sources, combined with PCoA analysis, most of them clustered separately, indicating richness and uniqueness. Some microbial groups seemed to be special or general in the nitrogen cycling. In conclusion, it suggested that microorganisms regulated the N cycling process, and may lead to N loss throughout the wetland, thus providing a basis for further elucidation of the microbial regulation of N cycling processes and the Earth's elemental cycles.
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Affiliation(s)
- Yanmei Li
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, China
| | - Lingling Xiong
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, China
| | - Hang Yu
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, China
| | - Kun Zeng
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, China
| | - Yunlin Wei
- Faculty of Life Science and Technology, Kunming University of Science and Technology, Kunming, 650500, China
| | - Haiyan Li
- Medical School, Kunming University of Science and Technology, Kunming, 650500, China
| | - Weikun Zeng
- School of Medicine, Kunming University, Kunming, 650214, China
| | - Xiuling Ji
- Medical School, Kunming University of Science and Technology, Kunming, 650500, China.
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10
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Cho K, Lee S, Jung J, Choi D. Elucidating prioritized factor for mainstream partial nitritation between C/N ratio and dissolved oxygen: Response surface methodology and microbial community shifts. ENVIRONMENTAL RESEARCH 2023; 227:115748. [PMID: 36972772 DOI: 10.1016/j.envres.2023.115748] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2023] [Revised: 02/24/2023] [Accepted: 03/22/2023] [Indexed: 05/08/2023]
Abstract
Recently, C/N ratio is suggested as a promising control factor with dissolved oxygen (DO) achieving mainstream partial nitritation (PN); however, their combined effects on mainstream PN are still limited. This study evaluated the mainstream PN with respect to the combined factors, and investigated the prioritized factor affecting the community of aerobic functional microbes competing with NOB. Response surface methodology was performed to assess the combined effects of C/N ratio and DO on the activity of functional microbes. Aerobic heterotrophic bacteria (AHB) played the greatest role in oxygen competition among functional microbes, which resulted in relative inhibition of nitrite-oxidizing bacteria (NOB). The combination of high C/N ratio and low DO had a positive role in the relative inhibition of NOB. In bioreactor operation, the PN was successfully achieved at ≥ 1.5 of C/N ratio for 0.5-2.0 mg/L DO conditions. Interestingly, aerobic functional microbes outcompeting NOB were shifted with C/N ratio rather than DO, suggesting C/N ratio is more prioritized factor achieving mainstream PN. These findings will provide insights into how combined aerobic conditions contribute to achieve mainstream PN.
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Affiliation(s)
- Kyungjin Cho
- Center for Water Cycle Research, Korea Institute of Science and Technology, Seoul, 02792, South Korea; Division of Energy & Environment Technology, KIST School, University of Science and Technology (UST), Seoul, 02792, South Korea
| | - Sangji Lee
- Department of Environmental Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan-Si, Gyeongbuk, 38541, South Korea
| | - Jinyoung Jung
- Department of Environmental Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan-Si, Gyeongbuk, 38541, South Korea
| | - Daehee Choi
- Department of Environmental Engineering, Yeungnam University, 280 Daehak-Ro, Gyeongsan-Si, Gyeongbuk, 38541, South Korea.
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11
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Mehrani MJ, Kowal P, Sobotka D, Godzieba M, Ciesielski S, Guo J, Makinia J. The coexistence and competition of canonical and comammox nitrite oxidizing bacteria in a nitrifying activated sludge system - Experimental observations and simulation studies. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 864:161084. [PMID: 36565884 DOI: 10.1016/j.scitotenv.2022.161084] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/30/2022] [Revised: 12/16/2022] [Accepted: 12/16/2022] [Indexed: 06/17/2023]
Abstract
The second step of nitrification can be mediated by nitrite oxidizing bacteria (NOB), i.e. Nitrospira and Nitrobacter, with different characteristics in terms of the r/K theory. In this study, an activated sludge model was developed to account for competition between two groups of canonical NOB and comammox bacteria. Heterotrophic denitrification on soluble microbial products was also incorporated into the model. Four 5-week washout trials were carried out at dissolved oxygen-limited conditions for different temperatures (12 °C vs. 20 °C) and main substrates (NH4+-N vs. NO2--N). Due to the aggressive reduction of solids retention time (from 4 to 1 d), the biomass concentrations were continuously decreased and stabilized after two weeks at a level below 400 mg/L. The collected experimental data (N species, biomass concentrations, and microbiological analyses) were used for model calibration and validation. In addition to the standard predictions (N species and biomass), the newly developed model also accurately predicted two microbiological indicators, including the relative abundance of comammox bacteria as well as nitrifiers to heterotrophs ratio. Sankey diagrams revealed that the relative contributions of specific microbial groups to N conversion pathways were significantly shifted during the trial. The contribution of comammox did not exceed 5 % in the experiments with both NH4+-N and NO2--N substrates. This study contributes to a better understanding of the novel autotrophic N removal processes (e.g. deammonification) with nitrite as a central intermediate product.
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Affiliation(s)
- Mohamad-Javad Mehrani
- Faculty of Civil and Environmental Engineering, Gdansk University of Technology, Narutowicza Street 11/12, 80-233 Gdansk, Poland
| | - Przemyslaw Kowal
- Faculty of Civil and Environmental Engineering, Gdansk University of Technology, Narutowicza Street 11/12, 80-233 Gdansk, Poland
| | - Dominika Sobotka
- Faculty of Civil and Environmental Engineering, Gdansk University of Technology, Narutowicza Street 11/12, 80-233 Gdansk, Poland
| | - Martyna Godzieba
- Department of Environmental Biotechnology, Department of Environmental Biotechnology, University of Warmia and Mazury in Olsztyn, Sloneczna 45G, 10-719 Olsztyn, Poland
| | - Slawomir Ciesielski
- Department of Environmental Biotechnology, Department of Environmental Biotechnology, University of Warmia and Mazury in Olsztyn, Sloneczna 45G, 10-719 Olsztyn, Poland
| | - Jianhua Guo
- Australian Centre for Water and Environmental Biotechnology (ACWEB, formerly AWMC), The University of Queensland, St. Lucia, Queensland 4072, Australia
| | - Jacek Makinia
- Faculty of Civil and Environmental Engineering, Gdansk University of Technology, Narutowicza Street 11/12, 80-233 Gdansk, Poland.
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12
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Keithley AE, Ryu H, Gomez-Alvarez V, Harmon S, Bennett-Stamper C, Williams D, Lytle DA. Comprehensive characterization of aerobic groundwater biotreatment media. WATER RESEARCH 2023; 230:119587. [PMID: 36638728 PMCID: PMC10119871 DOI: 10.1016/j.watres.2023.119587] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/20/2022] [Revised: 01/04/2023] [Accepted: 01/05/2023] [Indexed: 06/17/2023]
Abstract
Aerobic biotreatment systems can treat multiple reduced inorganic contaminants in groundwater, including ammonia (NH3), arsenic (As), iron (Fe), and manganese (Mn). While individual systems treating multiple contaminants simultaneously have been characterized and several systems treating one contaminant have been compared, a comparison of systems treating co-occurring contaminants is lacking. This study assessed the treatment performance and microbial communities within 7 pilot- and full-scale groundwater biotreatment systems in the United States that treated waters with pH 5.6-7.8, 0.1-2.0 mg/L dissolved oxygen, 75-376 mg CaCO3/L alkalinity, < 0.03-3.79 mg NH3-N/L, < 4-31 µg As/L, < 0.01-9.37 mg Fe/L, 2-1220 µg Mn/L, and 0.1-5.6 mg/L total organic carbon (TOC). Different reactor configurations and media types were represented, allowing for a broad assessment of linkages between water quality and microbial communities via microscopy, biofilm quantification, and molecular methods. Influent NH3, TOC, and pH contributed to differences in the microbial communities. Mn oxidase gene copy numbers were slightly negatively correlated with the influent Mn concentration, but no significant relationships between gene copy number and influent concentration were observed for the other contaminants. Extracellular enzyme activities, community composition, and carbon transformation pathways suggested heterotrophic bacteria may be important in nitrifying biofilters. Aerobic groundwater biofilters are complex, and improved understanding could lead to engineering enhancements.
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Affiliation(s)
- Asher E Keithley
- ORD, CESER, WID, Drinking Water Management Branch, U.S. Environmental Protection Agency, 26W. Martin Luther King Dr., Cincinnati, OH 45268, United States.
| | - Hodon Ryu
- ORD, CESER, WID, Drinking Water Management Branch, U.S. Environmental Protection Agency, 26W. Martin Luther King Dr., Cincinnati, OH 45268, United States
| | - Vicente Gomez-Alvarez
- ORD, CESER, WID, Drinking Water Management Branch, U.S. Environmental Protection Agency, 26W. Martin Luther King Dr., Cincinnati, OH 45268, United States
| | - Stephen Harmon
- ORD, CESER, WID, Drinking Water Management Branch, U.S. Environmental Protection Agency, 26W. Martin Luther King Dr., Cincinnati, OH 45268, United States
| | - Christina Bennett-Stamper
- ORD, CESER, WID, Drinking Water Management Branch, U.S. Environmental Protection Agency, 26W. Martin Luther King Dr., Cincinnati, OH 45268, United States
| | - Daniel Williams
- ORD, CESER, WID, Drinking Water Management Branch, U.S. Environmental Protection Agency, 26W. Martin Luther King Dr., Cincinnati, OH 45268, United States
| | - Darren A Lytle
- ORD, CESER, WID, Drinking Water Management Branch, U.S. Environmental Protection Agency, 26W. Martin Luther King Dr., Cincinnati, OH 45268, United States
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13
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Gomez-Alvarez V, Siponen S, Kauppinen A, Hokajärvi AM, Tiwari A, Sarekoski A, Miettinen IT, Torvinen E, Pitkänen T. A comparative analysis employing a gene- and genome-centric metagenomic approach reveals changes in composition, function, and activity in waterworks with different treatment processes and source water in Finland. WATER RESEARCH 2023; 229:119495. [PMID: 37155494 PMCID: PMC10125003 DOI: 10.1016/j.watres.2022.119495] [Citation(s) in RCA: 7] [Impact Index Per Article: 7.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Indexed: 05/10/2023]
Abstract
The emergence and development of next-generation sequencing technologies (NGS) has made the analysis of the water microbiome in drinking water distribution systems (DWDSs) more accessible and opened new perspectives in microbial ecology studies. The current study focused on the characterization of the water microbiome employing a gene- and genome-centric metagenomic approach to five waterworks in Finland with different raw water sources, treatment methods, and disinfectant. The microbial communities exhibit a distribution pattern of a few dominant taxa and a large representation of low-abundance bacterial species. Changes in the community structure may correspond to the presence or absence and type of disinfectant residual which indicates that these conditions exert selective pressure on the microbial community. The Archaea domain represented a small fraction (up to 2.5%) and seemed to be effectively controlled by the disinfection of water. Their role particularly in non-disinfected DWDS may be more important than previously considered. In general, non-disinfected DWDSs harbor higher microbial richness and maintaining disinfectant residual is significantly important for ensuring low microbial numbers and diversity. Metagenomic binning recovered 139 (138 bacterial and 1 archaeal) metagenome-assembled genomes (MAGs) that had a >50% completeness and <10% contamination consisting of 20 class representatives in 12 phyla. The presence and occurrence of nitrite-oxidizing bacteria (NOB)-like microorganisms have significant implications for nitrogen biotransformation in drinking water systems. The metabolic and functional complexity of the microbiome is evident in DWDSs ecosystems. A comparative analysis found a set of differentially abundant taxonomic groups and functional traits in the active community. The broader set of transcribed genes may indicate an active and diverse community regardless of the treatment methods applied to water. The results indicate a highly dynamic and diverse microbial community and confirm that every DWDS is unique, and the community reflects the selection pressures exerted at the community structure, but also at the levels of functional properties and metabolic potential.
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Affiliation(s)
- Vicente Gomez-Alvarez
- Office of Research and Development, U.S. Environmental Protection Agency, 26W. Martin Luther King Dr., Cincinnati, OH 45268, United States
- Corresponding author. (V. Gomez-Alvarez)
| | - Sallamaari Siponen
- Finnish Institute for Health and Welfare, Department of Health Security, Kuopio 70701, Finland
- Department of Environmental and Biological Sciences, Kuopio 70211, Finland
| | - Ari Kauppinen
- Finnish Institute for Health and Welfare, Department of Health Security, Kuopio 70701, Finland
| | - Anna-Maria Hokajärvi
- Finnish Institute for Health and Welfare, Department of Health Security, Kuopio 70701, Finland
| | - Ananda Tiwari
- Finnish Institute for Health and Welfare, Department of Health Security, Kuopio 70701, Finland
- Faculty of Veterinary Medicine, Department Food Hygiene and Environmental Health, University of Helsinki, Helsinki 00790, Finland
| | - Anniina Sarekoski
- Finnish Institute for Health and Welfare, Department of Health Security, Kuopio 70701, Finland
- Faculty of Veterinary Medicine, Department Food Hygiene and Environmental Health, University of Helsinki, Helsinki 00790, Finland
| | - Ilkka T. Miettinen
- Finnish Institute for Health and Welfare, Department of Health Security, Kuopio 70701, Finland
| | - Eila Torvinen
- Department of Environmental and Biological Sciences, Kuopio 70211, Finland
| | - Tarja Pitkänen
- Finnish Institute for Health and Welfare, Department of Health Security, Kuopio 70701, Finland
- Faculty of Veterinary Medicine, Department Food Hygiene and Environmental Health, University of Helsinki, Helsinki 00790, Finland
- Corresponding author at: Finnish Institute for Health and Welfare, Department of Health Security, Kuopio 70701, Finland. (T. Pitkänen)
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14
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Ide H, Ishii K, Takahashi Y, Fujitani H, Tsuneda S. Effects of Co-existing Heterotrophs on Physiology of and Nitrogen Metabolism in Autotrophic Nitrite-oxidizing Candidatus Nitrotoga. Microbes Environ 2023; 38:ME23076. [PMID: 38072409 PMCID: PMC10728634 DOI: 10.1264/jsme2.me23076] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/30/2023] [Accepted: 10/18/2023] [Indexed: 12/18/2023] Open
Abstract
Interactions between autotrophic nitrifiers and heterotrophs have attracted considerable attention in microbial ecology. However, the mechanisms by which heterotrophs affect the physiological activity of and nitrogen metabolism in autotrophic nitrite oxidizers remain unclear. We herein focused on nitrite-oxidizing Candidatus Nitrotoga and compared an axenic culture including only Ca. Nitrotoga with a co-culture of both Ca. Nitrotoga and Acidovorax in physiological experiments and transcriptomics. In the co-culture with Acidovorax, nitrite consumption by Ca. Nitrotoga was promoted, and some genes relevant to nitrogen metabolism in Ca. Nitrotoga were highly expressed. These results provide insights into the mechanisms by which co-existing heterotrophs affect autotrophic nitrifiers.
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Affiliation(s)
- Hiroto Ide
- Department of Life Science and Medical Bioscience, Waseda University, Tokyo, Japan
| | - Kento Ishii
- Department of Life Science and Medical Bioscience, Waseda University, Tokyo, Japan
- Research Organization for Nano & Life Innovation, Waseda University, Tokyo, Japan
| | - Yu Takahashi
- Department of Life Science and Medical Bioscience, Waseda University, Tokyo, Japan
| | - Hirotsugu Fujitani
- Research Organization for Nano & Life Innovation, Waseda University, Tokyo, Japan
- Department of Biological Sciences, Chuo University, Tokyo, Japan
| | - Satoshi Tsuneda
- Department of Life Science and Medical Bioscience, Waseda University, Tokyo, Japan
- Research Organization for Nano & Life Innovation, Waseda University, Tokyo, Japan
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15
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Tan Z, Guan Y, Luo Y, Wang L, Zhou H, Yang C, Meng D, Chen Y. Evaluation of the stability of shortcut nitrification-denitrification process based on online specific oxygen uptake rate monitoring. CHINESE CHEM LETT 2022. [DOI: 10.1016/j.cclet.2022.108074] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/24/2022]
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16
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Burzio C, Ekholm J, Modin O, Falås P, Svahn O, Persson F, van Erp T, Gustavsson DJI, Wilén BM. Removal of organic micropollutants from municipal wastewater by aerobic granular sludge and conventional activated sludge. JOURNAL OF HAZARDOUS MATERIALS 2022; 438:129528. [PMID: 35999740 DOI: 10.1016/j.jhazmat.2022.129528] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/17/2022] [Revised: 06/02/2022] [Accepted: 07/01/2022] [Indexed: 06/15/2023]
Abstract
Removal performances of organic micropollutants by conventional activated sludge (CAS) and aerobic granular sludge (AGS) were investigated at a full-scale wastewater treatment plant. Lab-scale kinetic experiments were performed to assess the micropollutant transformation rates under oxic and anoxic conditions. Transformation rates were used to model the micropollutant removal in the full-scale processes. Metagenomic sequencing was used to compare the microbial communities and antimicrobial resistance genes of the CAS and AGS systems. Higher transformation ability was observed for CAS compared to AGS for most compounds, both at the full-scale plant and in the complementary batch experiments. Oxic conditions supported the transformation of several micropollutants with faster and/or comparable rates compared to anoxic conditions. The estimated transformation rates from batch experiments adequately predicted the removal for most micropollutants in the full-scale processes. While the compositions in microbial communities differed between AGS and CAS, the full-scale biological reactors shared similar resistome profiles. Even though granular biomass showed lower potential for micropollutant transformation, AGS systems had somewhat higher gene cluster diversity compared to CAS, which could be related to a higher functional diversity. Micropollutant exposure to biomass or mass transfer limitations, therefore played more important roles in the observed differences in OMP removal.
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Affiliation(s)
- Cecilia Burzio
- Department of Architecture and Civil Engineering, Chalmers University of Technology, Gothenburg 41296, Sweden.
| | - Jennifer Ekholm
- Department of Architecture and Civil Engineering, Chalmers University of Technology, Gothenburg 41296, Sweden
| | - Oskar Modin
- Department of Architecture and Civil Engineering, Chalmers University of Technology, Gothenburg 41296, Sweden
| | - Per Falås
- Department of Chemical Engineering, Lund University, PO Box 124, Lund 22100, Sweden
| | - Ola Svahn
- Department of Environmental Science and Bioscience, Kristianstad University, Kristianstad 29139, Sweden
| | - Frank Persson
- Department of Architecture and Civil Engineering, Chalmers University of Technology, Gothenburg 41296, Sweden
| | - Tim van Erp
- Strömstad Municipality, Wastewater Treatment Plant Österröd, Strömstad 45233, Sweden
| | | | - Britt-Marie Wilén
- Department of Architecture and Civil Engineering, Chalmers University of Technology, Gothenburg 41296, Sweden
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17
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Wang Z, Zheng M, Duan H, Yuan Z, Hu S. A 20-Year Journey of Partial Nitritation and Anammox (PN/A): from Sidestream toward Mainstream. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2022; 56:7522-7531. [PMID: 35657148 DOI: 10.1021/acs.est.1c06107] [Citation(s) in RCA: 77] [Impact Index Per Article: 38.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/06/2023]
Abstract
Anaerobic ammonium oxidation (anammox) was discovered as a new microbial reaction in the late 1990s, which led to the development of an innovative energy- and carbon-efficient technology─partial nitritation and anammox (PN/A)─for nitrogen removal. PN/A was first applied to remove the nitrogen from high-strength wastewaters, e.g., anaerobic digestion liquor (i.e., sidestream), and further expanded to the main line of wastewater treatment plants (i.e., mainstream). While sidestream PN/A has been well-established with extensive full-scale installations worldwide, practical application of PN/A in mainstream treatment has been proven extremely challenging to date. A key challenge is achieving stable suppression of nitrite-oxidizing bacteria (NOB). This study examines the progress of NOB suppression in both sidestream- and mainstream PN/A over the past two decades. The successful NOB suppression in sidestream PN/A was reviewed, and these successes were evaluated in terms of their transferability into mainstream PN/A. Drawing on the learning over the past decades, we anticipate that a hybrid process, comprised of biofilm and floccular sludge, bears great potential to achieve efficient mainstream PN/A, while a combination of strategies is entailed for stable NOB suppression. Furthermore, the recent discovery of novel nitrifiers would trigger new opportunities and new challenges for mainstream PN/A.
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Affiliation(s)
- Zhiyao Wang
- Australian Centre for Water and Environmental Biotechnology (ACWEB, formerly AWMC), The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Min Zheng
- Australian Centre for Water and Environmental Biotechnology (ACWEB, formerly AWMC), The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Haoran Duan
- Australian Centre for Water and Environmental Biotechnology (ACWEB, formerly AWMC), The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Zhiguo Yuan
- Australian Centre for Water and Environmental Biotechnology (ACWEB, formerly AWMC), The University of Queensland, Brisbane, Queensland 4072, Australia
| | - Shihu Hu
- Australian Centre for Water and Environmental Biotechnology (ACWEB, formerly AWMC), The University of Queensland, Brisbane, Queensland 4072, Australia
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18
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Keuter S, Koch H, Sass K, Wegen S, Lee N, Lücker S, Spieck E. Some like it cold: The cellular organization and physiological limits of cold-tolerant nitrite-oxidizing Nitrotoga. Environ Microbiol 2022; 24:2059-2077. [PMID: 35229435 DOI: 10.1111/1462-2920.15958] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/10/2021] [Revised: 02/18/2022] [Accepted: 02/24/2022] [Indexed: 11/30/2022]
Abstract
Chemolithoautotrophic production of nitrate is accomplished by the polyphyletic functional group of nitrite-oxidizing bacteria (NOB). A widely distributed and important NOB clade in nitrogen removal processes at low temperatures is Nitrotoga, which however remains understudied due to the scarcity of cultivated representatives. Here, we present physiological, ultrastructural and genomic features of Nitrotoga strains from various habitats, including the first marine species enriched from an aquaculture system. Immunocytochemical analyses localized the nitrite-oxidizing enzyme machinery in the wide irregularly shaped periplasm, apparently without contact to the cytoplasmic membrane, confirming previous genomic data suggesting a soluble nature. Interestingly, in two strains we also observed multicellular complexes with a shared periplasmic space, which seem to form through incomplete cell division and might enhance fitness or survival. Physiological tests revealed differing tolerance limits towards dissolved inorganic nitrogen concentrations and confirmed the generally psychrotolerant nature of the genus was. Moreover, comparative analysis of 15 Nitrotoga genomes showed, e.g., a unique gene repertoire of the marine strain that could be advantageous in its natural habitat and confirmed the lack of genes for assimilatory nitrite reduction in a strain found to require ammonium for growth. Overall, these novel insights largely broaden our knowledge of Nitrotoga and elucidate the metabolic variability, physiological limits and thus potential ecological roles of this group of nitrite oxidizers. This article is protected by copyright. All rights reserved.
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Affiliation(s)
- Sabine Keuter
- Department of Microbiology and Biotechnology, University of Hamburg, Hamburg, Germany
| | - Hanna Koch
- Department of Microbiology, RIBES, Radboud University, Nijmegen, the Netherlands
| | - Katharina Sass
- Department of Microbiology and Biotechnology, University of Hamburg, Hamburg, Germany
| | - Simone Wegen
- Department of Microbiology and Biotechnology, University of Hamburg, Hamburg, Germany
| | - Natuschka Lee
- Department of Ecology and Environmental Science and Research Infrastructure Fluorescence in situ Hybridization (FISH), Chemical Biological Centre, Umeå University, Umeå, Sweden.,Department of Microbiology, Technical University of Munich, Freising, Germany
| | - Sebastian Lücker
- Department of Microbiology, RIBES, Radboud University, Nijmegen, the Netherlands
| | - Eva Spieck
- Department of Microbiology and Biotechnology, University of Hamburg, Hamburg, Germany
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