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Hao Q, Lyu X, Qin D, Du N, Wu S, Bai S, Chen Z, Wang P, Zhao X. Synergistic mechanisms of denitrification in FeS 2-based constructed wetlands: Effects of organic carbon availability under day-night alterations. BIORESOURCE TECHNOLOGY 2024; 406:131066. [PMID: 38969240 DOI: 10.1016/j.biortech.2024.131066] [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: 05/22/2024] [Revised: 06/29/2024] [Accepted: 07/02/2024] [Indexed: 07/07/2024]
Abstract
In constructed wetlands (CWs), carbon source availability profoundly affected microbial metabolic activities engaged in both iron cycle and nitrogen metabolism. However, research gaps existed in understanding the biotransformation of nitrogen and iron in response to fluctuations in organic carbon content under day-night alterations. Results demonstrated increased removal efficiency of NO3--N (95.7 %) and NH4+-N (75.70 %) under light conditions, attributed to increased total organic carbon (TOC). This enhancement promoted the relative abundance of bacteria involved in nitrogen and iron processes, establishing a more stable microbial network. Elevated TOC content also upregulated genes for iron metabolism and glycolysis, facilitating denitrification. Spearman correlation analysis supported the synergistic mechanisms between FeS2-based autotrophic denitrification and TOC-mediated heterotrophic denitrification under light conditions. The significant impact of carbon sources on microbial activities underscores the critical role of organic carbon availability in enhancing nitrogen removal efficiency, providing valuable insights for optimizing FeS2-based CWs design and operation strategies.
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Affiliation(s)
- Qirui Hao
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China; College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China
| | - Xiaonan Lyu
- Beijing Aquatic Technology Extension Station, Beijing 100021, China
| | - Dongli Qin
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China
| | - Ningning Du
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China
| | - Song Wu
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China
| | - Shuyan Bai
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China
| | - Zhongxiang Chen
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China
| | - Peng Wang
- Heilongjiang River Fisheries Research Institute, Chinese Academy of Fishery Sciences, Harbin 150070, China.
| | - Xinyue Zhao
- College of Resources and Environment, Northeast Agricultural University, Harbin 150030, China.
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2
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Litti Y, Elcheninov A, Botchkova E, Chernyh N, Merkel A, Vishnyakova A, Popova N, Zhang Y, Safonov A. Metagenomic evidence of a novel anammox community in a cold aquifer with high nitrogen pollution. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2024; 365:121629. [PMID: 38944958 DOI: 10.1016/j.jenvman.2024.121629] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/10/2024] [Revised: 06/06/2024] [Accepted: 06/26/2024] [Indexed: 07/02/2024]
Abstract
The process of anaerobic ammonium oxidation by nitrite (anammox) is a globally essential part of N cycle. To date, 8 Candidatus genera and more than 22 species of anammox bacteria have been discovered in various anthropogenic and natural habitats, including nitrogen-polluted aquifers. In this work, anammox bacteria were detected for the first time in the groundwater ecosystem with high anthropogenic nitrogen pollution (up to 1760 mg NO3--N/L and 280 mg NH4+-N/L) and low year-round temperature (7-8 °C) in the zone of a uranium sludge repository. Further metagenomic analysis resulted in retrieval of metagenome-assembled genomes of 4 distinct anammox bacteria: a new genus named Ca. Frigussubterria, new species in Ca. Kuenenia, and two strains of a new species in Ca. Scalindua. Analysis of the genomes revealed essential genes involved in anammox metabolism. Both strains of Ca. Scalindua chemeplantae had a high copy number of genes encoding the cold shock proteins CspA/B, which can also function as an antifreeze protein (CspB). Ca. Kuenenia glazoviensis and Ca. Frigussubterria udmurtiae were abundant in less N-polluted site, while Ca. Scalindua chemeplantae inhabited both sites. Genes for urea utilization, reduction of insoluble Fe2O3 or MnO2, assimilatory sulfate reduction, reactive oxygen detoxification, nitrate reduction to ammonium, and putatively arsenate respiration were found. These findings enrich knowledge of the functional and phylogenetic diversity of anammox bacteria and improve understanding of the nitrogen cycle in polluted aquifers.
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Affiliation(s)
- Yuriy Litti
- Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, 60 let Oktjabrja pr-t, 7, bld. 2, 117312, Moscow, Russia.
| | - Alexander Elcheninov
- Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, 60 let Oktjabrja pr-t, 7, bld. 2, 117312, Moscow, Russia.
| | - Ekaterina Botchkova
- Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, 60 let Oktjabrja pr-t, 7, bld. 2, 117312, Moscow, Russia.
| | - Nikolay Chernyh
- Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, 60 let Oktjabrja pr-t, 7, bld. 2, 117312, Moscow, Russia.
| | - Alexander Merkel
- Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, 60 let Oktjabrja pr-t, 7, bld. 2, 117312, Moscow, Russia.
| | - Anastasia Vishnyakova
- Federal Research Centre "Fundamentals of Biotechnology" of the Russian Academy of Sciences, 60 let Oktjabrja pr-t, 7, bld. 2, 117312, Moscow, Russia.
| | - Nadezhda Popova
- Frumkin Institute of Physical Chemistry and Electrochemistry RAS, 31, bld.4, Leninsky Prospect, 119071, Moscow, Russia.
| | - Yaobin Zhang
- Key Laboratory of Industrial Ecology and Environmental Engineering (Dalian University of Technology), Ministry of Education, School of Environmental Science and Technology, Dalian University of Technology, Dalian, 116024, China.
| | - Alexey Safonov
- Frumkin Institute of Physical Chemistry and Electrochemistry RAS, 31, bld.4, Leninsky Prospect, 119071, Moscow, Russia.
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Wang S, Tian Y, Bi Y, Meng F, Qiu C, Yu J, Liu L, Zhao Y. Recovery strategies and mechanisms of anammox reaction following inhibition by environmental factors: A review. ENVIRONMENTAL RESEARCH 2024; 252:118824. [PMID: 38588911 DOI: 10.1016/j.envres.2024.118824] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/24/2024] [Revised: 03/10/2024] [Accepted: 03/27/2024] [Indexed: 04/10/2024]
Abstract
Anaerobic ammonium oxidation (anammox) is a promising biological method for treating nitrogen-rich, low-carbon wastewater. However, the application of anammox technology in actual engineering is easily limited by environmental factors. Considerable progress has been investigated in recent years in anammox restoration strategies, significantly addressing the challenge of poor reaction performance following inhibition. This review systematically outlines the strategies employed to recover anammox performance following inhibition by conventional environmental factors and emerging pollutants. Additionally, comprehensive summaries of strategies aimed at promoting anammox activity and enhancing nitrogen removal performance provide valuable insights into the current research landscape in this field. The review contributes to a comprehensive understanding of restoration strategies of anammox-based technologies.
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Affiliation(s)
- Shaopo Wang
- School of Environmental and Municipal Engineering, Tianjin Chengjian University, Jinjing Road 26, Tianjin, 300384, China; Tianjin Key Laboratory of Aquatic Science and Technology, Jinjing Road 26, Tianjin, China
| | - Yu Tian
- School of Environmental and Municipal Engineering, Tianjin Chengjian University, Jinjing Road 26, Tianjin, 300384, China; Tianjin Key Laboratory of Aquatic Science and Technology, Jinjing Road 26, Tianjin, China
| | - Yanmeng Bi
- School of Environmental and Municipal Engineering, Tianjin Chengjian University, Jinjing Road 26, Tianjin, 300384, China; Tianjin Key Laboratory of Aquatic Science and Technology, Jinjing Road 26, Tianjin, China
| | - Fansheng Meng
- School of Environmental and Municipal Engineering, Tianjin Chengjian University, Jinjing Road 26, Tianjin, 300384, China; Tianjin Key Laboratory of Aquatic Science and Technology, Jinjing Road 26, Tianjin, China
| | - Chunsheng Qiu
- School of Environmental and Municipal Engineering, Tianjin Chengjian University, Jinjing Road 26, Tianjin, 300384, China; Tianjin Key Laboratory of Aquatic Science and Technology, Jinjing Road 26, Tianjin, China
| | - Jingjie Yu
- School of Environmental and Municipal Engineering, Tianjin Chengjian University, Jinjing Road 26, Tianjin, 300384, China; Tianjin Key Laboratory of Aquatic Science and Technology, Jinjing Road 26, Tianjin, China
| | - Lingjie Liu
- School of Environmental and Municipal Engineering, Tianjin Chengjian University, Jinjing Road 26, Tianjin, 300384, China; Tianjin Key Laboratory of Aquatic Science and Technology, Jinjing Road 26, Tianjin, China.
| | - Yingxin Zhao
- School of Environmental Science and Engineering, Tianjin University, Tianjin, 300350, China.
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4
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Naufal M, Wu JH. Chemomixoautotrophy and stress adaptation of anammox bacteria: A review. WATER RESEARCH 2024; 257:121663. [PMID: 38669739 DOI: 10.1016/j.watres.2024.121663] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/06/2023] [Revised: 01/16/2024] [Accepted: 04/21/2024] [Indexed: 04/28/2024]
Abstract
Anaerobic ammonium oxidizing (anammox) bacteria, which were first discovered nearly three decades ago, are crucial for treating ammonium-containing wastewater. Studies have reported on the biochemical nitrogen conversion process and the physiological, phylogenic, and ecological features of anammox bacteria. For a long time, anammox bacteria were assumed to have a lithoautotrophic lifestyle. However, recent studies have suggested the functional versatility of anammox bacteria. Genome-based analysis and experiments with enrichment cultures have demonstrated the association of the metabolic activities of anammox bacteria with different stress conditions, revealing the importance of utilizing specific organic substances, including organoautotrophy, for growth and adaptation to stress conditions. Our understanding regarding the utilization and metabolism of organic substances and their associations with anammox reactions in anammox bacteria is growing but still incomplete. In this review, we summarize the effect of the utilization of organic substances by anammox bacteria under environmental stress conditions, emphasizing their potential organoautotrophic activity and metabolic flexibility. Although most anammox bacteria may utilize specific organic substances, Ca. Brocadia exhibited the highest level of mixoautotrophic activity. The environmental factors that substantially affect the organoautotrophic activities of anammox bacteria were also examined. This review provides a new perspective on the organoautotrophic capacity of anammox bacteria.
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Affiliation(s)
- Muhammad Naufal
- Department of Environmental Engineering, National Cheng Kung University, No.1, University Road, East District, Tainan City 70101, Taiwan
| | - Jer-Horng Wu
- Department of Environmental Engineering, National Cheng Kung University, No.1, University Road, East District, Tainan City 70101, Taiwan.
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5
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Guo H, Gao M, Yao Y, Zou X, Zhang Y, Huang W, Liu Y. Enhancing anammox process with granular activated carbon: A study on Microbial Extracellular Secretions (MESs). THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 926:171980. [PMID: 38537814 DOI: 10.1016/j.scitotenv.2024.171980] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/03/2024] [Revised: 02/29/2024] [Accepted: 03/23/2024] [Indexed: 04/05/2024]
Abstract
Granular activated carbon (GAC), a porous carbon-based material, provides increased attachment space for functional microorganisms and enhances nitrogen removal by facilitating extracellular electron transfer in the anammox process. This study investigates the effects of GAC on the biosynthesis of microbial extracellular secretions (MESs) and explores the roles of these secretions in anammox activities. Four lab-scale reactors were operated: two downstream UASB reactors (D1 and D2) receiving effluents from the upstream UASB reactors (U1: no-GAC, U2: yes-GAC). Our results indicate that MESs were enhanced with the addition of GAC. The effluent from U2 exhibited a 59.62 % higher amino acid content than that from U1. These secretions contributed to an increase in the nitrogen loading rate (NLR) in the downstream reactors. Specifically, NLR in D1 increased from 130.5 to 142.7 g N/m3/day, and in D2, it escalated from 137.5 to 202.8 g N/m3/day, likely through acting as cross-feeding substrates or vital nutrients. D2 also showed increased anammox bacterial activity, enriched Ca. Brocadia population and hao gene abundance. Furthermore, this study revealed that D2 sludge has significantly higher extracellular polymeric substances (EPS) (48.71 mg/g VSS) and a larger average granule size (1.201 ± 0.119 mm) compared to D1 sludge. Overall, GAC-stimulated MESs may have contributed to the enhanced performance of the anammox process.
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Affiliation(s)
- Hengbo Guo
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Mengjiao Gao
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada; College of Environment and Ecology, Chongqing University, Chongqing 400044, China
| | - Yiduo Yao
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Xin Zou
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Yihui Zhang
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada
| | - Wendy Huang
- Department of Civil Engineering, University of Calgary, Calgary, Alberta T2N 1N4, Canada
| | - Yang Liu
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta T6G 1H9, Canada; School of Civil and Environmental Engineering, Queensland University of Technology, Brisbane, Queensland 4000, Australia.
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6
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Hu X, Wang H, Ji B, Wang B, Guo W, Chen R, Jiang C, Chen Y, Zhou D, Zhang Q. Metagenomic insights into the mechanism for the rapid enrichment and high stability of Candidatus Brocadia facilitated by Fe(Ⅲ). WATER RESEARCH 2024; 252:121224. [PMID: 38309072 DOI: 10.1016/j.watres.2024.121224] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/12/2023] [Revised: 12/09/2023] [Accepted: 01/28/2024] [Indexed: 02/05/2024]
Abstract
The rapid enrichment of anammox bacteria and its fragile resistance to adverse environment are the critical problems facing of anammox processes. As an abundant component in anammox bacteria, iron has been proved to promote the activity and growth of anammox bacteria in the mature anammox systems, but the functional and metabolic profiles in Fe(III) enhanced emerging anammox systems have not been evaluated. Results indicated that the relative abundance of functional genes involved in oxidative phosphorylation, nitrogen metabolism, cofactors synthesis, and extracellular polymers synthesis pathways was significantly promoted in the system added with 5 mg/L Fe(III) (R5). These enhanced pathways were crucial to energy generation, nitrogen removal, cell activity and proliferation, and microbial self-defense, thereby accelerating the enrichment of anammox bacteria Ca. Brocadia and facilitating their resistance to adverse environments. Microbial community analysis showed that the proportion of Ca. Brocadia in R5 also increased to 64.42 %. Hence, R5 could adapt rapidly to the increased nitrogen loading rate and increase the nitrogen removal rate by 108 % compared to the system without Fe(III) addition. However, the addition of 10 and 20 mg/L Fe(III) showed inhibitory effects on the growth and activity of anammox bacteria, which exhibited the lower relative abundance of Ca. Brocadia and unstable or even collapsed nitrogen removal performance. This study not only clarified the concentration range of Fe(III) that promoted and inhibited the enrichment of anammox bacteria, but also deepened our understanding of the functional and metabolic mechanisms underlying enhanced enrichment of anammox bacteria by Fe(III), providing a potential strategy to hasten the start-up of anammox from conventional activated sludge.
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Affiliation(s)
- Xiaoling Hu
- School of Civil Engineering, Wuhan University, Wuhan 430072, China
| | - Hongyu Wang
- School of Civil Engineering, Wuhan University, Wuhan 430072, China.
| | - Bin Ji
- Department of Water and Wastewater Engineering, School of Urban Construction, Wuhan University of Science and Technology, Wuhan 430065, China
| | - Bin Wang
- School of Civil Engineering, Wuhan University, Wuhan 430072, China
| | - Wenbin Guo
- School of Civil Engineering, Wuhan University, Wuhan 430072, China
| | - Rongfan Chen
- School of Civil Engineering, Wuhan University, Wuhan 430072, China
| | - Can Jiang
- School of Civil Engineering, Wuhan University, Wuhan 430072, China
| | - Yanfang Chen
- School of Civil Engineering, Wuhan University, Wuhan 430072, China
| | - Dao Zhou
- School of Civil Engineering, Wuhan University, Wuhan 430072, China
| | - Qian Zhang
- School of Civil Engineering & Architecture, Wuhan University of Technology, Wuhan 430070, China
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7
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Zhang L, Zhao W, Ji X, Wang J, Wu P, Qian F, Chen C, Shen Y, Liu W. Waste iron scraps promote anammox bacteria to resist inorganic carbon limitation. THE SCIENCE OF THE TOTAL ENVIRONMENT 2024; 912:169042. [PMID: 38061648 DOI: 10.1016/j.scitotenv.2023.169042] [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: 10/09/2023] [Revised: 11/26/2023] [Accepted: 11/30/2023] [Indexed: 01/18/2024]
Abstract
The anaerobic ammonium oxidation (anammox) process is adversely affected by the limitation of inorganic carbon (IC). In this research, a new technique was introduced to assist anammox biomass in counteracting the adverse effects of IC limitation by incorporating waste iron scraps (WIS), a cheap and easily accessible byproduct of lathe cutting. Results demonstrated that reducing the influent IC/TN ratio from 0.08-0.09 to 0.04 resulted in a 20 % decrease in the nitrogen removal rate (NRR) for the control reactor, with an average specific anammox activity (SAA) of 0.65 g N/g VSS/day. Nevertheless, the performance of the WIS-assisted anammox reactor remained robust despite the reduction in IC supply. In fact, the NRR and SAA of the WIS-assisted reactor exhibited substantial improvements, reaching approximately 1.86 kg/(m3·day) and 0.98 g N/g VSS/day, respectively. These values surpassed those achieved by the control reactor by approximately 39 % and 51 %, respectively. The microbial analysis confirmed that the WIS addition significantly stimulated the proliferation of anammox bacteria (dominated by Candidatus Kuenenia) under IC limitation. The anammox gene abundances in the WIS-assisted anammox reactor were 3-4 times higher than those in the control reactor. Functional genes prediction based on the KEGG database revealed that the addition of WIS significantly enhanced the relative abundances of genes associated with nitrogen metabolism, IC fixation, and central carbon metabolism. Together, the results suggested that WIS promoted carbon dioxide fixation of anammox species to resist IC limitation. This study provided a promising approach for effectively treating high ammonium-strength wastewater using anammox under IC limitation.
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Affiliation(s)
- Liangwei Zhang
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Wei Zhao
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Xiaoming Ji
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Jianfang Wang
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China; National & Local Joint Engineering Laboratory for Municipal Sewage Resource Utilization Technology, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Peng Wu
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China; National & Local Joint Engineering Laboratory for Municipal Sewage Resource Utilization Technology, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Feiyue Qian
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China; National & Local Joint Engineering Laboratory for Municipal Sewage Resource Utilization Technology, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Chongjun Chen
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China; National & Local Joint Engineering Laboratory for Municipal Sewage Resource Utilization Technology, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Yaoliang Shen
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China; National & Local Joint Engineering Laboratory for Municipal Sewage Resource Utilization Technology, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Wenru Liu
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China; National & Local Joint Engineering Laboratory for Municipal Sewage Resource Utilization Technology, Suzhou University of Science and Technology, Suzhou 215009, China.
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8
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Jiang C, Zhang L, Chi Y, Xu S, Xie Y, Yang D, Qian Y, Chen F, Zhang W, Wang D, Tian Z, Zhang S, Li YY, Zhuang X. Rapid start-up of an innovative pilot-scale staged PN/A continuous process for enhanced nitrogen removal from mature landfill leachate via robust NOB elimination and efficient biomass retention. WATER RESEARCH 2024; 249:120949. [PMID: 38070348 DOI: 10.1016/j.watres.2023.120949] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/27/2023] [Revised: 11/28/2023] [Accepted: 11/29/2023] [Indexed: 01/03/2024]
Abstract
The start-up and stable operation of partial nitritation-anammox (PN/A) treatment of mature landfill leachate (MLL) still face challenges. This study developed an innovative staged pilot-scale PN/A system to enhance nitrogen removal from MLL. The staged process included a PN unit, an anammox upflow enhanced internal circulation biofilm (UEICB) reactor, and a post-biofilm unit. Rapid start-up of the continuous flow PN process (full-concentration MLL) was achieved within 35 days by controlling dissolved oxygen and leveraging free ammonia and free nitrous acid to selectively suppress nitrite-oxidizing bacteria (NOB). The UEICB was equipped with an annular flow agitator combined with the enhanced internal circulation device of the guide tube, which achieved an efficient enrichment of Candidatus Kuenenia in the biofilm (relative abundance of 33.4 %). The nitrogen removal alliance formed by the salt-tolerant anammox bacterium (Candidatus Kuenenia) and denitrifying bacteria (unclassified SBR1031 and Denitratisoma) achieved efficient nitrogen removal of UEICB (total nitrogen removal percentage: 90.8 %) and at the same time effective treatment of the refractory organic matter (ROM). The dual membrane process of UEICB fixed biofilm combined with post-biofilm is effective in sludge retention, and can stably control the effluent suspended solids (SS) at a level of less than 5 mg/L. The post-biofilm unit ensured that effluent total nitrogen (TN) remained below the 40 mg/L discharge standard (98.5 % removal efficiency). Compared with conventional nitrification-denitrification systems, the staged PN/A process substantially reduced oxygen consumption, sludge production, CO2 emissions and carbon consumption by 22.8 %, 67.1 %, 87.1 % and 87.1 %, respectively. The 195-day stable operation marks the effective implementation of the innovative pilot-scale PN/A process in treating actual MLL. This study provides insights into strategies for rapid start-up, robust NOB suppression, and anammox biomass retention to advance the application of PN/A in high-ammonia low-carbon wastewater.
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Affiliation(s)
- Cancan Jiang
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Yangtze River Delta Research Center for Eco-Environmental Sciences, China Key Laboratory of Environmental Biotechnology, Yiwu 322000, China
| | - Liang Zhang
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Yongzhi Chi
- School of Environmental and Municipal Engineering, Tianjin Chengjian University, Tianjin 300384, China
| | - Shengjun Xu
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Yangtze River Delta Research Center for Eco-Environmental Sciences, China Key Laboratory of Environmental Biotechnology, Yiwu 322000, China.
| | - Yawen Xie
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Dongmin Yang
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Yunzhi Qian
- School of Environment and Spatial Informatics, China University of Mining & Technology, Xuzhou 221116, China
| | - Fuqiang Chen
- Graduate School of Environmental Studies, Tohoku University, 6-6-06 Aza-Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan
| | - Weijun Zhang
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Dongsheng Wang
- Yangtze River Delta Research Center for Eco-Environmental Sciences, China Key Laboratory of Environmental Biotechnology, Yiwu 322000, China
| | - Zhe Tian
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Shujun Zhang
- Research and Development Center of Beijing Drainage Group Technology, Beijing 100022, China
| | - Yu-You Li
- Graduate School of Environmental Studies, Tohoku University, 6-6-06 Aza-Aoba, Aramaki, Aoba-ku, Sendai, Miyagi 980-8579, Japan
| | - Xuliang Zhuang
- Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China; Yangtze River Delta Research Center for Eco-Environmental Sciences, China Key Laboratory of Environmental Biotechnology, Yiwu 322000, China; Institute of Tibetan Plateau Research, Chinese Academy of Sciences, Beijing 100101, China.
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9
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Chen X, Jiang L, Aghilinasrollahabadi K, Proano CA, Meisler S, Anderson MO, Xue J, Li G. Impacts of crude glycerol on anaerobic ammonium oxidation (Anammox) process in wastewater treatment. BIORESOURCE TECHNOLOGY 2024; 394:130271. [PMID: 38158091 DOI: 10.1016/j.biortech.2023.130271] [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: 10/24/2023] [Revised: 12/26/2023] [Accepted: 12/26/2023] [Indexed: 01/03/2024]
Abstract
This work investigated the impact of a waste-derived carbon source, crude glycerol (CG), on Anammox. Batch bioassays were conducted to identify inhibitory component(s) in CG, and the relationship between Anammox activity and the concentration of CG, pure glycerol, and methanol were assessed. The results showed that the half-maximal inhibitory concentration of CG and methanol are 434.5 ± 51.8 and 143.0 ± 19.6 mg chemical oxygen demand (COD) L-1, respectively, while pure glycerol at 0-2283 mg COD L-1 had no significant adverse effect on Anammox. The results suggested methanol is the major inhibitor in CG via a non-competitive inhibition mechanism. COD/total inorganic nitrogen ratio of > 1.3 was observed to cause a significant Anammox inhibition (>20 %), especially at low substrate level. These results are valuable for evaluating the feasibility of using CG for nitrogen removal in water resource recovery facilities, promoting sustainable development.
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Affiliation(s)
- Xiaojue Chen
- Department of Civil and Environmental Engineering, University of Maryland, 4298 Campus Dr., College Park, MD 20742, USA
| | - Liu Jiang
- Department of Civil and Environmental Engineering, University of Maryland, 4298 Campus Dr., College Park, MD 20742, USA
| | | | - Camila A Proano
- Department of Civil and Environmental Engineering, University of Maryland, 4298 Campus Dr., College Park, MD 20742, USA
| | - Seth Meisler
- Department of Civil and Environmental Engineering, University of Maryland, 4298 Campus Dr., College Park, MD 20742, USA
| | - Marya O Anderson
- Department of Civil and Environmental Engineering, University of Maryland, 4298 Campus Dr., College Park, MD 20742, USA
| | - Jinkai Xue
- Cold-Region Water Resource Recovery Laboratory (CRWRRL), Environmental Systems Engineering, Faculty of Engineering and Applied Science, University of Regina, 3737 Wascana Parkway, Regina, SK S4S 0A2, Canada
| | - Guangbin Li
- Department of Civil and Environmental Engineering, University of Maryland, 4298 Campus Dr., College Park, MD 20742, USA.
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10
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Zhang Y, Zhang J, Yu D, Li J, Zhao X, Ma G, Zhi J, Dong G, Miao Y. Migration of microorganisms between nitrification-denitrification flocs, anammox biofilms and blank carriers during mainstream anammox start-up. BIORESOURCE TECHNOLOGY 2024; 393:130129. [PMID: 38040314 DOI: 10.1016/j.biortech.2023.130129] [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: 11/17/2023] [Accepted: 11/28/2023] [Indexed: 12/03/2023]
Abstract
To solve the shortage of inoculum, the feasibility of establishing simultaneous partial nitrification, anammox, and denitrification (SNAD) reactor through inoculating nitrification-denitrification sludge, anammox biofilm and blank carriers was investigated. Advanced nitrogen removal efficiency of 91.2 ± 3.6 % was achieved. Bacteria related to nitrogen removal and fermentation were enriched in anammox biofilm, blank carriers and flocs, and the abundance of dominant anaerobic ammonia oxidizing bacteria (AnAOB), Candidatus Brocadia, reached 3.4 %, 0.5 % and 0.3 %, respectively. Candidatus Competibacter and Calorithrix became the dominant denitrifying bacteria (DNB) and fermentative bacteria (FB), respectively. The SNAD system was successfully established, and new mature biofilms formed in blank carriers, which could provide inoculum for other anammox processes. Partial nitrification, partial denitrification and aerobic_chemoheterotrophy were existed and facilitated AnAOB enrichment. Microbial correlation networks revealed the cooperation between DNB, FB and AnAOB that promoted nitrogen removal. Overall, the SNAD process was started up through inoculating more accessible inoculum.
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Affiliation(s)
- Yu Zhang
- School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, PR China
| | - Jianhua Zhang
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, PR China
| | - Deshuang Yu
- School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, PR China
| | - Jiawen Li
- School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, PR China
| | - Xinchao Zhao
- School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, PR China
| | - Guocheng Ma
- School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, PR China
| | - Jiaru Zhi
- School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, PR China
| | - Guoqing Dong
- School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, PR China
| | - Yuanyuan Miao
- School of Environmental and Municipal Engineering, Qingdao University of Technology, Qingdao 266520, PR China; School of Environmental Science and Engineering, Qingdao University, Qingdao 266071, PR China.
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11
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Zhang X, Al-Dhabi NA, Gao B, Zhou L, Zhang X, Zhu Z, Tang W, Chuma A, Chen C, Wu P. Robust rehabilitation of anammox system by granular activated carbon under long-term starvation stress: Microbiota restoration and metabolic reinforcement. BIORESOURCE TECHNOLOGY 2024; 393:130113. [PMID: 38013039 DOI: 10.1016/j.biortech.2023.130113] [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: 10/13/2023] [Revised: 11/20/2023] [Accepted: 11/24/2023] [Indexed: 11/29/2023]
Abstract
This article investigates the buffering capacity and recovery-enhancing ability of granular activated carbon (GAC) in a starved (influent total nitrogen: 20 mg/L) anaerobic ammonium oxidation (anammox) reactor. The findings revealed that anammox aggregated and sustained basal metabolism with shorter performance recovery lag (6 days) and better nitrogen removal efficiency (84.9 %) due to weak electron-repulsion and abundance redox-active groups on GAC's surface. GAC-supported enhanced extracellular polymeric substance secretion aided anammox in resisting starvation. GAC also facilitated anammox bacterial proliferation and expedited the restoration of anammox microbial community from a starved state to its initial-level. Metabolic function analyses unveiled that GAC improved the expression of genes involved in amino acid metabolism and sugar-nucleotide biosynthesis while promoted microbial cross-feeding, ultimately indicating the superior potential of GAC in stimulating more diverse metabolic networks in nutrient-depleted anammox consortia. This research sheds light on the microbial and metabolic mechanisms underlying GAC-mediated anammox system in low-substrate habitats.
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Affiliation(s)
- Xiaonong Zhang
- National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology, Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Naif Abdullah Al-Dhabi
- Department of Botany and Microbiology, College of Science, King Saud University, P. O. Box 2455, Riyadh 11451, Saudi Arabia
| | - Bo Gao
- National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology, Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Li Zhou
- National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology, Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Xingxing Zhang
- School of Ecological and Environmental Sciences, East China Normal University, Shanghai 200241, China
| | - Zixuan Zhu
- National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology, Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Wangwang Tang
- College of Environmental Science and Engineering and Key Laboratory of Environmental Biology and Pollution Control (Ministry of Education), Hunan University, Changsha 410082, China
| | - Amen Chuma
- National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology, Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Chongjun Chen
- National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology, Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
| | - Peng Wu
- National and Local Joint Engineering Laboratory of Municipal Sewage Resource Utilization Technology, Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment, School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China.
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12
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Peng Y, Gu X, Zhang M, Yan P, Sun S, He S. Simultaneously enhanced autotrophic-heterotrophic denitrification in iron-based ecological floating bed by plant biomass: Metagenomics insights into microbial communities, functional genes and nitrogen metabolic pathways. WATER RESEARCH 2024; 248:120868. [PMID: 37979568 DOI: 10.1016/j.watres.2023.120868] [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: 06/07/2023] [Revised: 10/27/2023] [Accepted: 11/12/2023] [Indexed: 11/20/2023]
Abstract
In this study, the ecological floating bed supporting with zero-valent iron (ZVI) and plant biomass (EFB-IB) was constructed to improve nitrogen removal from low-polluted water. The effects of ZVI coupling with plant biomass on microbial community structure, metabolic pathways and functional genes were analyzed by metagenomic sequencing, and the mechanism for nitrogen removal was revealed. Results showed that compared with mono-ZVI system (EFB-C), the denitrification efficiencies of EFB-IB were effectively enhanced, with the higher average NO3--N removal efficiencies of 22.60-59.19%. Simultaneously, the average NH4+-N removal efficiencies were 73.08-91.10%. Metagenomic analyses showed that EFB-IB enriched microbes that involved in iron cycle, lignocellulosic degradation and nitrogen metabolism. Plant biomass addition simultaneously increased the relative abundances of autotrophic and heterotrophic denitrifying bacteria. Network analysis showed the cooperation between autotrophic and heterotrophic denitrifying bacteria in EFB-IB. Moreover, compared with EFB-C, plant biomass addition increased the relative abundances of genes related to iron cycle, lignocellulose degradation and glycolysis processes, ensuring the production of autotrophic and heterotrophic electron donors. Therefore, the relative abundances of key enzymes and functional genes related to denitrification were higher in EFB-IB, being beneficial to the NO3--N removal. Additionally, the correlation analysis of nitrogen removal and functional genes verified the synergistic mechanism of iron-based autotrophic denitrification and plant biomass-mediated heterotrophic denitrification in EFB-IB. In summary, plant biomass has excellent potential to improve the nitrogen removal of iron-based EFB from low-polluted water.
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Affiliation(s)
- Yuanyuan Peng
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Xushun Gu
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Manping Zhang
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Pan Yan
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Shanshan Sun
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China
| | - Shengbing He
- School of Environmental Science and Engineering, Shanghai Jiao Tong University, Shanghai 200240, China.
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13
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Lin L, Zhang Y, Li YY. Enhancing start-up strategies for anammox granular sludge systems: A review. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 902:166398. [PMID: 37604370 DOI: 10.1016/j.scitotenv.2023.166398] [Citation(s) in RCA: 5] [Impact Index Per Article: 5.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/18/2023] [Revised: 08/15/2023] [Accepted: 08/15/2023] [Indexed: 08/23/2023]
Abstract
The anaerobic ammonium oxidation (anammox) process has been developed as one of the optimal alternatives to the conventional biological nitrogen removal process because of its high nitrogen removal capacity and low energy consumption. However, the slow growth rate of anammox bacteria and its high sensitivity to environmental changes have resulted in fewer anammox sludge sources for process start-up and a lengthy start-up period. Given that anammox microorganisms tend to aggregate, granular-anammox sludge is a frequent byproduct of the anammox process. In this study, we review state-of-the-art strategies for promoting the formation of anammox granules and the start-up of the anammox process based on the literature of the past decade. These strategies are categorized as the transformation of alternative sludge, the addition of accelerators, the introduction of functional carriers, and the implementation of other physical methods. In addition, the formation mechanism of anammox granules, the operational performance of various strategies, and their promotion mechanisms are introduced. Finally, prospects are presented to indicate the gaps in contemporary research and the potential future research directions. This review functions as a summary guideline and theoretical reference for the cultivation of granular-anammox sludge, the start-up of the anammox process, and its practical application.
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Affiliation(s)
- Lan Lin
- College of the Environment & Ecology, Xiamen University, Xiamen, Fujian, 361102, China
| | - Yanlong Zhang
- College of the Environment & Ecology, Xiamen University, Xiamen, Fujian, 361102, China
| | - Yu-You Li
- Department of Civil and Environmental Engineering, Graduate School of Engineering, Tohoku University, 6-6-06 Aramaki Aza Aoba, Aoba-ku, Sendai, Miyagi 980-8579, Japan.
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14
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Wang H, Fan Y, Zhou M, Liu J, Li X, Wang Y. Metagenomics insight into the long-term effect of ferrous ions on the mainstream anammox system. ENVIRONMENTAL RESEARCH 2023; 238:117243. [PMID: 37778610 DOI: 10.1016/j.envres.2023.117243] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/22/2023] [Revised: 09/23/2023] [Accepted: 09/25/2023] [Indexed: 10/03/2023]
Abstract
Anaerobic ammonium oxidation (anammox) bacteria have a high requirement for iron for their growth and metabolism. However, it remains unclear whether iron supplementation can sustain the stability of mainstream anammox systems at varying temperatures. Here, we investigated the long-term effects of Fe2+ on the mainstream anammox systems. Our findings revealed that the nitrogen removal efficiency (NRE) of the anammox system supplemented with 5 mg/L Fe2+ decreased from 76.5 ± 0.76% at 35 °C to 39.0 ± 9.9% at 25 °C. Notably, higher dosages of Fe2+ (15 mg/L and 30 mg/L) inhibited the anammox system, resulting in NREs of 15.9 ± 8.1% and 2.5 ± 1.1% at 25 °C, respectively. The results of microbial communities and function profiles suggested that the high Fe2+ dosage seriously affected the iron assimilation and utilization in the mainstream anammox system. This was evident from the decreased abundance of genes associated with Fe(II) transport and uptake, which in turn hindered the biosynthesis of intracellular iron-cofactors, resulting in decrease in the absolute abundance of Candidatus Brocadia, a key anammox bacterium, as well as a decline in NRE. Furthermore, our results showed that the anammox process was more susceptible to iron supplementation at 25 °C compared to 35 °C, which may be due to the oxidative stress reactions induced by combined lowered temperature and a high Fe2+ dosage. Overall, these findings offer a deeper understanding of the effect of iron in mainstream anammox systems, which can contribute to improved stability maintenance and effectiveness of anammox processes.
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Affiliation(s)
- Han Wang
- State Key Laboratory of Pollution Control and Resources Reuse, Shanghai Institute of Pollution Control and Ecological Security, College of Environmental Science and Engineering, Tongji University, Siping Road, Shanghai, 200092, China
| | - Yufei Fan
- State Key Laboratory of Pollution Control and Resources Reuse, Shanghai Institute of Pollution Control and Ecological Security, College of Environmental Science and Engineering, Tongji University, Siping Road, Shanghai, 200092, China
| | - Mingda Zhou
- State Key Laboratory of Pollution Control and Resources Reuse, Shanghai Institute of Pollution Control and Ecological Security, College of Environmental Science and Engineering, Tongji University, Siping Road, Shanghai, 200092, China
| | - Jiawei Liu
- State Key Laboratory of Pollution Control and Resources Reuse, Shanghai Institute of Pollution Control and Ecological Security, College of Environmental Science and Engineering, Tongji University, Siping Road, Shanghai, 200092, China
| | - Xiang Li
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China
| | - Yayi Wang
- State Key Laboratory of Pollution Control and Resources Reuse, Shanghai Institute of Pollution Control and Ecological Security, College of Environmental Science and Engineering, Tongji University, Siping Road, Shanghai, 200092, China.
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15
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Lee S, Cho M, Sadowsky MJ, Jang J. Denitrifying Woodchip Bioreactors: A Microbial Solution for Nitrate in Agricultural Wastewater-A Review. J Microbiol 2023; 61:791-805. [PMID: 37594681 DOI: 10.1007/s12275-023-00067-z] [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: 06/05/2023] [Revised: 07/04/2023] [Accepted: 07/05/2023] [Indexed: 08/19/2023]
Abstract
Nitrate (NO3-) is highly water-soluble and considered to be the main nitrogen pollutants leached from agricultural soils. Its presence in aquatic ecosystems is reported to cause various environmental and public health problems. Bioreactors containing microbes capable of transforming NO3- have been proposed as a means to remediate contaminated waters. Woodchip bioreactors (WBRs) are continuous flow, reactor systems located below or above ground. Below ground systems are comprised of a trench filled with woodchips, or other support matrices. The nitrate present in agricultural drainage wastewater passing through the bioreactor is converted to harmless dinitrogen gas (N2) via the action of several bacteria species. The WBR has been suggested as one of the most cost-effective NO3--removing strategy among several edge-of-field practices, and has been shown to successfully remove NO3- in several field studies. NO3- removal in the WBR primarily occurs via the activity of denitrifying microorganisms via enzymatic reactions sequentially reducing NO3- to N2. While previous woodchip bioreactor studies have focused extensively on its engineering and hydrological aspects, relatively fewer studies have dealt with the microorganisms playing key roles in the technology. This review discusses NO3- pollution cases originating from intensive farming practices and N-cycling microbial metabolisms which is one biological solution to remove NO3- from agricultural wastewater. Moreover, here we review the current knowledge on the physicochemical and operational factors affecting microbial metabolisms resulting in removal of NO3- in WBR, and perspectives to enhance WBR performance in the future.
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Affiliation(s)
- Sua Lee
- Division of Biotechnology and Advanced Institute of Environment and Bioscience, Jeonbuk National University, Iksan, Jeonbuk, 54596, Republic of Korea
| | - Min Cho
- Division of Biotechnology and Advanced Institute of Environment and Bioscience, Jeonbuk National University, Iksan, Jeonbuk, 54596, Republic of Korea
| | - Michael J Sadowsky
- BioTechnology Institute, Department of Soil, Water and Climate, and Department of Microbial and Plant Biology, University of Minnesota, St. Paul, MN, 55108, USA
| | - Jeonghwan Jang
- Division of Biotechnology and Advanced Institute of Environment and Bioscience, Jeonbuk National University, Iksan, Jeonbuk, 54596, Republic of Korea.
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16
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Hu P, Qian Y, Liu J, Gao L, Li Y, Xu Y, Wu J, Hong Y, Ford T, Radian A, Yang Y, Gu JD. Delineation of the complex microbial nitrogen-transformation network in an anammox-driven full-scale wastewater treatment plant. WATER RESEARCH 2023; 235:119799. [PMID: 36965294 DOI: 10.1016/j.watres.2023.119799] [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: 09/30/2022] [Revised: 02/21/2023] [Accepted: 02/23/2023] [Indexed: 06/18/2023]
Abstract
Microbial-driven nitrogen removal is a crucial step in modern full-scale wastewater treatment plants (WWTPs), and the complexity of nitrogen transformation is integral to the various wastewater treatment processes. A full understanding of the overall nitrogen cycling networks in WWTPs is therefore a prerequisite for the further enhancement and optimization of wastewater treatment processes. In this study, metagenomics and metatranscriptomics were used to elucidate the microbial nitrogen removal processes in an ammonium-enriched full-scale WWTP, which was configured as an anaerobic-anoxic-anaerobic-oxic system for efficient nitrogen removal (99.63%) on a duck breeding farm. A typical simultaneous nitrification-anammox-denitrification (SNAD) process was established in each tank of this WWTP. Ammonia was oxidized by ammonia-oxidizing bacteria (AOB), archaea (AOA), and nitrite-oxidizing bacteria (NOB), and the produced nitrite and nitrate were further reduced to dinitrogen gas (N2) by anammox and denitrifying bacteria. Visible red anammox biofilms were formed successfully on the sponge carriers submerged in the anoxic tank, and the nitrogen removal rate by anammox reaction was 4.85 times higher than that by denitrification based on 15N isotope labeling and analysis. This supports the significant accumulation of anammox bacteria on the carriers responsible for efficient nitrogen removal. Two distinct anammox bacteria, named "Ca. Brocadia sp. PF01" and "Ca. Jettenia sp. PF02", were identified from the biofilm in this investigation. By recovering their genomic features and their metabolic capabilities, our results indicate that the highly active core anammox process found in PF01, suggests extending its niche within the plant. With the possible contribution of the dissimilatory nitrate reduction to ammonium (DNRA) reaction, enriching PF02 within the biofilm may also be warranted. Collectively, this study highlights the effective design strategies of a full-scale WWTP with enrichment of anammox bacteria on the carrier materials for nitrogen removal and therefore the biochemical reaction mechanisms of the contributing members.
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Affiliation(s)
- Pengfei Hu
- Civil and Environmental Engineering, Technion - Israel Institute of Technology, Haifa 320003, Israel; Environmental Science and Engineering Research Group, Guangdong Technion -Israel Institute of Technology, 241 Daxue Road, Shantou, Guangdong 515063, the People's Republic of China
| | - Youfen Qian
- Civil and Environmental Engineering, Technion - Israel Institute of Technology, Haifa 320003, Israel; Environmental Science and Engineering Research Group, Guangdong Technion -Israel Institute of Technology, 241 Daxue Road, Shantou, Guangdong 515063, the People's Republic of China
| | - Jinye Liu
- State Key Laboratory of Biocontrol, School of Ecology, Sun Yat-sen University, Guangzhou, Guangdong 510275, the People's Republic of China
| | - Lin Gao
- Civil and Environmental Engineering, Technion - Israel Institute of Technology, Haifa 320003, Israel; Environmental Science and Engineering Research Group, Guangdong Technion -Israel Institute of Technology, 241 Daxue Road, Shantou, Guangdong 515063, the People's Republic of China
| | - Yuxin Li
- School of Environmental Sciences and Engineering, Guangdong University of Technology, Guangzhou, Guangdong 510006, the People's Republic of China
| | - Yanbin Xu
- School of Environmental Sciences and Engineering, Guangdong University of Technology, Guangzhou, Guangdong 510006, the People's Republic of China
| | - Jiapeng Wu
- Institute of Environmental Research at Greater Bay, Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou, Guangdong 510006, the People's Republic of China
| | - Yiguo Hong
- Institute of Environmental Research at Greater Bay, Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Guangzhou University, Guangzhou, Guangdong 510006, the People's Republic of China
| | - Tim Ford
- Department of Biomedical and Nutritional Sciences, University of Massachusetts Lowell, Lowell, MA 01854, United States of America
| | - Adi Radian
- Civil and Environmental Engineering, Technion - Israel Institute of Technology, Haifa 320003, Israel
| | - Yuchun Yang
- State Key Laboratory of Biocontrol, School of Ecology, Sun Yat-sen University, Guangzhou, Guangdong 510275, the People's Republic of China.
| | - Ji-Dong Gu
- Civil and Environmental Engineering, Technion - Israel Institute of Technology, Haifa 320003, Israel; Environmental Science and Engineering Research Group, Guangdong Technion -Israel Institute of Technology, 241 Daxue Road, Shantou, Guangdong 515063, the People's Republic of China; Guangdong Provincial Key Laboratory of Materials and Technologies for Energy Conversion, Guangdong Technion - Israel Institute of Technology, 241 Daxue Road, Shantou, Guangdong 515063, the People's Republic of China.
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17
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Zhang D, Yu H, Yang Y, Liu F, Li M, Huang J, Yu Y, Wang C, Jiang F, He Z, Yan Q. Ecological interactions and the underlying mechanism of anammox and denitrification across the anammox enrichment with eutrophic lake sediments. MICROBIOME 2023; 11:82. [PMID: 37081531 PMCID: PMC10116762 DOI: 10.1186/s40168-023-01532-y] [Citation(s) in RCA: 4] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 12/06/2022] [Accepted: 03/22/2023] [Indexed: 05/03/2023]
Abstract
BACKGROUND Increasing attention has recently been devoted to the anaerobic ammonium oxidation (anammox) in eutrophic lakes due to its potential key functions in nitrogen (N) removal for eutrophication control. However, successful enrichment of anammox bacteria from lake sediments is still challenging, partly due to the ecological interactions between anammox and denitrifying bacteria across such enrichment with lake sediments remain unclear. RESULTS This study thus designed to fill such knowledge gaps using bioreactors to enrich anammox bacteria with eutrophic lake sediments for more than 365 days. We continuously monitored the influent and effluent water, measured the anammox and denitrification efficiencies, quantified the anammox and denitrifying bacteria, as well as the related N cycling genes. We found that the maximum removal efficiencies of NH4+ and NO2- reached up to 85.92% and 95.34%, respectively. Accordingly, the diversity of anammox and denitrifying bacteria decreased significantly across the enrichment, and the relative dominant anammox (e.g., Candidatus Jettenia) and denitrifying bacteria (e.g., Thauera, Afipia) shifted considerably. The ecological cooperation between anammox and denitrifying bacteria tended to increase the microbial community stability, indicating a potential coupling between anammox and denitrifying bacteria. Moreover, the nirS-type denitrifiers showed stronger coupling with anammox bacteria than that of nirK-type denitrifiers during the enrichment. Functional potentials as depicted by metagenome sequencing confirmed the ecological interactions between anammox and denitrification. Metagenome-assembled genomes-based ecological model indicated that the most dominant denitrifiers could provide various materials such as amino acid, cofactors, and vitamin for anammox bacteria. Cross-feeding in anammox and denitrifying bacteria highlights the importance of microbial interactions for increasing the anammox N removal in eutrophic lakes. CONCLUSIONS This study greatly expands our understanding of cooperation mechanisms among anammox and denitrifying bacteria during the anammox enrichment with eutrophic lake sediments, which sheds new insights into N removal for controlling lake eutrophication. Video Abstract.
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Affiliation(s)
- Dandan Zhang
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, School of Ecology, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), State Key Laboratory for Biocontrol, Sun Yat-Sen University, Guangzhou, 510006 China
| | - Huang Yu
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, School of Ecology, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), State Key Laboratory for Biocontrol, Sun Yat-Sen University, Guangzhou, 510006 China
| | - Yuchun Yang
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, School of Ecology, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), State Key Laboratory for Biocontrol, Sun Yat-Sen University, Guangzhou, 510006 China
| | - Fei Liu
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, School of Ecology, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), State Key Laboratory for Biocontrol, Sun Yat-Sen University, Guangzhou, 510006 China
| | - Mingyue Li
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, School of Ecology, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), State Key Laboratory for Biocontrol, Sun Yat-Sen University, Guangzhou, 510006 China
| | - Jie Huang
- Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072 China
| | - Yuhe Yu
- Key Laboratory of Aquatic Biodiversity and Conservation of Chinese Academy of Sciences, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072 China
| | - Cheng Wang
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, School of Ecology, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), State Key Laboratory for Biocontrol, Sun Yat-Sen University, Guangzhou, 510006 China
| | - Feng Jiang
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, School of Ecology, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), State Key Laboratory for Biocontrol, Sun Yat-Sen University, Guangzhou, 510006 China
| | - Zhili He
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, School of Ecology, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), State Key Laboratory for Biocontrol, Sun Yat-Sen University, Guangzhou, 510006 China
| | - Qingyun Yan
- Environmental Microbiomics Research Center, School of Environmental Science and Engineering, School of Ecology, Southern Marine Science and Engineering Guangdong Laboratory (Zhuhai), State Key Laboratory for Biocontrol, Sun Yat-Sen University, Guangzhou, 510006 China
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18
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Gao M, Dang H, Zou X, Yu N, Guo H, Yao Y, Liu Y. Deciphering the role of granular activated carbon (GAC) in anammox: Effects on microbial succession and communication. WATER RESEARCH 2023; 233:119753. [PMID: 36841162 DOI: 10.1016/j.watres.2023.119753] [Citation(s) in RCA: 15] [Impact Index Per Article: 15.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/06/2022] [Revised: 01/24/2023] [Accepted: 02/15/2023] [Indexed: 06/18/2023]
Abstract
Anaerobic ammonium oxidation (anammox) offered an energy-efficient option for nitrogen removal from wastewater. Granular activated carbon (GAC) addition has been reported that improved biomass immobilization, but the role of GAC in anammox reactors has not been sufficiently revealed. In this study, it was observed that GAC addition in an upflow anaerobic sludge blanket (UASB) reactor led to the significantly shortened anammox enrichment time (shortened by 45 days) than the reactor without GAC addition. The nitrogen removal rate was 0.83 kg N/m3/day versus 0.76 kg N/m3/day in GAC and non-GAC reactors, respectively after 255 days' operation. Acyl-homoserine lactone (AHL) quorum sensing signal molecule C8-HSL had comparable concentrations in both anammox reactors, whereas the signal molecule C12-HSL was more pervasive in the reactor containing GAC than the reactor without GAC. Microbial analysis revealed distinct anammox development in both reactors, with Candidatus Brocadia predominant in the reactor that did not contain GAC, and Candidatus Kuenenia predominant in the reactor that contained GAC. Denitrification bacteria likely supported anammox metabolism in both reactors. The analyses of microbial functions suggested that AHL-dependent quorum sensing was enhanced with the addition of GAC, and that GAC possibly augmented the extracellular electron transfer (EET)-dependent anammox reaction.
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Affiliation(s)
- Mengjiao Gao
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Hongyu Dang
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Xin Zou
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Najiaowa Yu
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Hengbo Guo
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Yiduo Yao
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada
| | - Yang Liu
- Department of Civil and Environmental Engineering, University of Alberta, Edmonton, Alberta, T6G 1H9, Canada.
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19
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Chu N, Jiang Y, Liang Q, Liu P, Wang D, Chen X, Li D, Liang P, Zeng RJ, Zhang Y. Electricity-Driven Microbial Metabolism of Carbon and Nitrogen: A Waste-to-Resource Solution. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2023; 57:4379-4395. [PMID: 36877891 DOI: 10.1021/acs.est.2c07588] [Citation(s) in RCA: 8] [Impact Index Per Article: 8.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/18/2023]
Abstract
Electricity-driven microbial metabolism relies on the extracellular electron transfer (EET) process between microbes and electrodes and provides promise for resource recovery from wastewater and industrial discharges. Over the past decades, tremendous efforts have been dedicated to designing electrocatalysts and microbes, as well as hybrid systems to push this approach toward industrial adoption. This paper summarizes these advances in order to facilitate a better understanding of electricity-driven microbial metabolism as a sustainable waste-to-resource solution. Quantitative comparisons of microbial electrosynthesis and abiotic electrosynthesis are made, and the strategy of electrocatalyst-assisted microbial electrosynthesis is critically discussed. Nitrogen recovery processes including microbial electrochemical N2 fixation, electrocatalytic N2 reduction, dissimilatory nitrate reduction to ammonium (DNRA), and abiotic electrochemical nitrate reduction to ammonia (Abio-NRA) are systematically reviewed. Furthermore, the synchronous metabolism of carbon and nitrogen using hybrid inorganic-biological systems is discussed, including advanced physicochemical, microbial, and electrochemical characterizations involved in this field. Finally, perspectives for future trends are presented. The paper provides valuable insights on the potential contribution of electricity-driven microbial valorization of waste carbon and nitrogen toward a green and sustainable society.
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Affiliation(s)
- Na Chu
- Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
- CAS Key Laboratory of Environmental and Applied Microbiology, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
- University of Chinese Academy of Sciences, Beijing 100049, China
| | - Yong Jiang
- Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Qinjun Liang
- Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Panpan Liu
- School of Ecology and Environment, Zhengzhou University, Zhengzhou 450001, China
| | - Donglin Wang
- Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China
| | - Xueming Chen
- Fujian Provincial Engineering Research Center of Rural Waste Recycling Technology, College of Environment and Safety Engineering, Fuzhou University, Fuzhou 350116, China
| | - Daping Li
- CAS Key Laboratory of Environmental and Applied Microbiology, Environmental Microbiology Key Laboratory of Sichuan Province, Chengdu Institute of Biology, Chinese Academy of Sciences, Chengdu 610041, China
| | - Peng Liang
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, PR China
| | - Raymond Jianxiong Zeng
- Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation, College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Yifeng Zhang
- Department of Environmental Engineering, Technical University of Denmark, DK-2800 Lyngby, Denmark
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20
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Feng F, Liu Z, Tang X, Wu X, Qu C, How SW, Wu D, Xiao R, Tang CJ, Lin Z, Chai L, Chen GH. Dosing with pyrite significantly increases anammox performance: Its role in the electron transfer enhancement and the functions of the Fe-N-S cycle. WATER RESEARCH 2023; 229:119393. [PMID: 36442270 DOI: 10.1016/j.watres.2022.119393] [Citation(s) in RCA: 21] [Impact Index Per Article: 21.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/15/2022] [Revised: 11/16/2022] [Accepted: 11/18/2022] [Indexed: 06/16/2023]
Abstract
Anaerobic ammonium oxidation (anammox) represents an energy-efficient process for biological nitrogen removal from ammonium-rich wastewater. However, there are mechanistic issues unsolved regarding the low microbial electron transfer and undesired accumulation of nitrate in treated water, limiting its widespread engineering applications. We found that the addition of pyrite (1 g L-1 reactor), an earth-abundant iron-bearing sulfide mineral, to the anammox system significantly improved the nitrogen removal rate by 52% in long-term operation at a high substrate shock loading (3.86 kg N m-3 d-1). Two lines of evidence were presented to unravel the underlying mechanisms of the pyrite-induced enhancement. Physiochemical evidence indicated that an increase of cytochromes c and Fe-S protein was responsible for the accelerated electron transfer among metabolic enzymes. Multi-omics evidence showed that the depletion of nitrate was attributed to the Fe-N-S cycle driven by nitrate-dependent Fe(II) oxidation and S-based denitrification. This study deepens our understanding of the roles of electron transfer and the Fe-N-S cycle in anammox systems, providing a fundamental basis for the development of mediators in the anammox process for practical implications.
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Affiliation(s)
- Fan Feng
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; National Engineering Research Centre for Control and Treatment of Heavy Metal Pollution, Changsha, 410083, China
| | - Zhigong Liu
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; National Engineering Research Centre for Control and Treatment of Heavy Metal Pollution, Changsha, 410083, China
| | - Xi Tang
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; National Engineering Research Centre for Control and Treatment of Heavy Metal Pollution, Changsha, 410083, China
| | - Xing Wu
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; National Engineering Research Centre for Control and Treatment of Heavy Metal Pollution, Changsha, 410083, China
| | - Caiyan Qu
- Ghent University Global Campus, Incheon, Republic of Korea; Department of Green Chemistry and Technology, Ghent University, and Centre for Advanced Process Technology for Urban Resource Recovery (CAPTURE), Ghent 9000, Belgium
| | - Seow Wah How
- Ghent University Global Campus, Incheon, Republic of Korea; Department of Green Chemistry and Technology, Ghent University, and Centre for Advanced Process Technology for Urban Resource Recovery (CAPTURE), Ghent 9000, Belgium
| | - Di Wu
- Ghent University Global Campus, Incheon, Republic of Korea; Department of Green Chemistry and Technology, Ghent University, and Centre for Advanced Process Technology for Urban Resource Recovery (CAPTURE), Ghent 9000, Belgium
| | - Ruiyang Xiao
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; National Engineering Research Centre for Control and Treatment of Heavy Metal Pollution, Changsha, 410083, China
| | - Chong-Jian Tang
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; National Engineering Research Centre for Control and Treatment of Heavy Metal Pollution, Changsha, 410083, China.
| | - Zhang Lin
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; National Engineering Research Centre for Control and Treatment of Heavy Metal Pollution, Changsha, 410083, China
| | - Liyuan Chai
- Department of Environmental Engineering, School of Metallurgy and Environment, Central South University, Changsha, 410083, China; National Engineering Research Centre for Control and Treatment of Heavy Metal Pollution, Changsha, 410083, China
| | - Guang-Hao Chen
- Department of Civil and Environmental Engineering, Chinese National Engineering Research Center for Control & Treatment of Heavy Metal Pollution (Hong Kong Branch) and Water Technology Center, The Hong Kong University of Science and Technology, Hong Kong, China
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21
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Liu Q, Li J, Zhao Y, Li X, Zhang Q, Sui J, Wang C, Peng Y. Mechanism of suspended sludge impact on anammox enrichment in anoxic biofilm through long term operation and microbial analysis. WATER RESEARCH 2023; 229:119412. [PMID: 36459890 DOI: 10.1016/j.watres.2022.119412] [Citation(s) in RCA: 14] [Impact Index Per Article: 14.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/08/2022] [Revised: 11/17/2022] [Accepted: 11/23/2022] [Indexed: 06/17/2023]
Abstract
The basic premise of anammox-technical application reliability in municipal wastewater treatment is substantially enriched anammox bacteria. To enrich the anammox, the special interaction mechanism between the suspended sludge (SS) and anoxic biofilm was investigated over three months in a partial denitrification/anammox biosystem subjected to dynamic changes in SS (absence→ presence→ absence). Results show that the introduction of SS significantly decreased the anammox nitrogen removal efficiency (83.8 ± 6.5%→ 48.7 ± 17.0%). With the presence or absence of SS, the spatial distribution of anammox bacteria within the anoxic biofilm gradually changed between the inner and outer layers, as detected by CLSM-FISH. qPCR and metagenomic sequencing show that changes in the presence and absence status of SS significantly reduced the abundance of the NO reducing functional gene, while the NO supply capacity (NO3-→NO) was improved, further favoring the anammox process. Batch tests and typical cycles further demonstrated that the anammox bacteria can stably acquire NO2-, and anammox bacteria in the anoxic biofilm competed far more NO2- than denitrifying bacteria according to the typical pH curve. Accordingly, the abundance of Candidatus Brocadia, as detected by high throughput sequencing, decreased in the anoxic biofilms with the introduction of SS, but greatly increased (0.82%→2.22%) after SS discharge. This study sheds new light on the high in-situ enrichment of anammox in mainstream.
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Affiliation(s)
- Qiyu Liu
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China
| | - Jianwei Li
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China
| | - Yang Zhao
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China
| | - Xiyao Li
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China
| | - Qiong Zhang
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China
| | - Jun Sui
- Guangdong Shouhui Lantian Engineering and Technology Co. Ltd, 510075, PR China
| | - Chuanxin Wang
- Guangdong Shouhui Lantian Engineering and Technology Co. Ltd, 510075, PR China
| | - Yongzhen Peng
- National Engineering Laboratory for Advanced Municipal Wastewater Treatment and Reuse Technology, Engineering Research Center of Beijing, Beijing University of Technology, Beijing 100124, PR China.
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22
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Yang JH, Huang DQ, Geng YC, Ling YR, Fan NS, Jin RC. Role of quorum sensing-based regulation in development of anaerobic ammonium oxidation process. BIORESOURCE TECHNOLOGY 2023; 367:128228. [PMID: 36332868 DOI: 10.1016/j.biortech.2022.128228] [Citation(s) in RCA: 1] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/26/2022] [Revised: 10/25/2022] [Accepted: 10/26/2022] [Indexed: 06/16/2023]
Abstract
Shortage of anaerobic ammonium oxidation (anammox) sludge greatly limits the extensive full-scale application of anammox-based processes. Although numerous start-up strategies have been proposed, the interaction among microbial consortia and corresponding mechanism during the process development remain unknown. In this study, three reactors were established based on different seed sludges. After 27 days, the anammox process inoculated with anammox granules and activated sludge (1:5) was firstly achieved, and the highest nitrogen removal rate was 1.17 kg N m-3 d-1. Correspondingly, the anammox activity and abundances of related functional genes increased. Notably, the dominant anammox bacteria shifted from Candidatus Kuenenia to Candidatus Brocadia. Metagenomic analysis indicated that quorum sensing-based regulation mainly contributed to the proliferation and accumulation of anammox bacteria. This work provides an insight into the quorum sensing (QS)-regulated microbial interactions in the anammox and activated sludge consortia during the process development.
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Affiliation(s)
- Jun-Hui Yang
- Laboratory of Water Pollution Remediation, School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China
| | - Dong-Qi Huang
- Laboratory of Water Pollution Remediation, School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China
| | - Yin-Ce Geng
- Laboratory of Water Pollution Remediation, School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China
| | - Yi-Rong Ling
- Laboratory of Water Pollution Remediation, School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China
| | - Nian-Si Fan
- Laboratory of Water Pollution Remediation, School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China; School of Engineering, Hangzhou Normal University, Hangzhou 310018, China.
| | - Ren-Cun Jin
- Laboratory of Water Pollution Remediation, School of Life and Environmental Sciences, Hangzhou Normal University, Hangzhou 311121, China; School of Engineering, Hangzhou Normal University, Hangzhou 310018, China
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23
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Li Y, Liang H, Yang W, Cheng L, Cao J, Wang P, Gao D. Enhanced nitrogen removal in mainstream deammonification systems at ambient temperature by novel modified carriers and differentiation of microbial community transformation. BIORESOURCE TECHNOLOGY 2022; 366:128158. [PMID: 36272683 DOI: 10.1016/j.biortech.2022.128158] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/28/2022] [Revised: 10/12/2022] [Accepted: 10/13/2022] [Indexed: 06/16/2023]
Abstract
Zeolite-modified polyurethane (ZP) carriers and zeolite/tourmaline-modified polyurethane (ZTP) carriers were proposed to enhance mainstream deammonification. The system with ZTP carriers was rapidly established in 28 days with a nitrogen removal rate (NRR) of 0.150 kg N·(m3·d)-1. Moreover, the facilitative effect of tourmaline was suggested by the highest humic acid peak intensity and more balanced potential activity. Besides, SEM-EDS analysis revealed carrier characteristic improvement was achieved in both novel carriers while maintaining an excellent spatial structure. Moreover, the microbial analysis suggested that both modified carriers support the substrate supply to anaerobic ammonium oxidizing bacteria (AnAOB) by enhancing dissimilatory nitrate reduction to ammonium and partial denitrification under nitrate accumulation conditions. Nevertheless, the ZTP system had a greater advantage over maintaining the original AnAOB (Candidatus Jettenia) and ammonium oxidizing bacteria (Nitrosomonas) abundance. Overall, this study provides ZTP carriers with great potential for facilitating the establishment of mainstream deammonification at full-scale WWTPs.
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Affiliation(s)
- Yuqi Li
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China
| | - Hong Liang
- Centre for Urban Environmental Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China; Collaborative Innovation Center of Energy Conservation & Emission Reduction and Sustainable Urban-Rural Development in Beijing, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
| | - Wenbo Yang
- Centre for Urban Environmental Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China; Collaborative Innovation Center of Energy Conservation & Emission Reduction and Sustainable Urban-Rural Development in Beijing, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
| | - Lang Cheng
- Centre for Urban Environmental Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China; Collaborative Innovation Center of Energy Conservation & Emission Reduction and Sustainable Urban-Rural Development in Beijing, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
| | - Jiasuo Cao
- Centre for Urban Environmental Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China; Collaborative Innovation Center of Energy Conservation & Emission Reduction and Sustainable Urban-Rural Development in Beijing, Beijing University of Civil Engineering and Architecture, Beijing 100044, China
| | - Peng Wang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China
| | - Dawen Gao
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Harbin 150090, Heilongjiang, China; Centre for Urban Environmental Remediation, Beijing University of Civil Engineering and Architecture, Beijing, 100044, China; Collaborative Innovation Center of Energy Conservation & Emission Reduction and Sustainable Urban-Rural Development in Beijing, Beijing University of Civil Engineering and Architecture, Beijing 100044, China.
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24
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Liu W, Li T, Wang J, Shen Y, Ji X, Yang D. A new concept of waste iron recycling for the enhancement of the anammox process. CHEMOSPHERE 2022; 307:136151. [PMID: 36028122 DOI: 10.1016/j.chemosphere.2022.136151] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/12/2022] [Revised: 08/10/2022] [Accepted: 08/18/2022] [Indexed: 06/15/2023]
Abstract
As a by-product of industry, waste iron scraps (WIS) are low-cost and widely available, which was potential for the development of iron-assisted anammox. In this study, the feasibility of adding WIS to enhance the nitrogen removal of the anammox process (also called WIS-assisted anammox) was demonstrated. Results indicated that the WIS-assisted anammox reactors performed a 15-35% higher nitrogen removal efficiency than that of the control. Compared to the sludge from the control, the sludge from the WIS-assisted anammox reactors had a higher iron content (78-113 g kg-1 SS) and a better specific anammox activity (10.8-15.5 mg N g-1 VSS h-1). The enhanced growth of the anammox bacteria (related to Ca. Kuenenia stuttgartiensis with 99% similarity) in the WIS-assisted anammox reactors was also confirmed by high-throughput sequencing and qPCR. Furthermore, the functional genes predicted by PICRUSt2 revealed a higher level of hydroxylamine oxidoreductase (hao)-like proteins expression of the biomass from the WIS-assisted anammox reactors, implying that the hydroxylamine-related anammox pathway was promoted. Additionally, the observation of cytoplasmic nitrate reductase (narG), copper-containing nitrite reductase (nirK), and nitric oxide reductase (norB) suggested that the introduction of WIS might promote the denitrification ability. This was correlated to the lower ΔNO3-/ΔNH4+ ratio observed in these WIS-assisted anammox reactors. Overall, the WIS-assisted anammox offers a sustainable nitrogen removal process for wastewater treatment with waste iron recycling.
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Affiliation(s)
- Wenru Liu
- National & Local Joint Engineering Laboratory for Municipal Sewage Resource Utilization Technology, Suzhou University of Science and Technology, Suzhou, 215009, China; School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China.
| | - Tianhao Li
- School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China
| | - Jianfang Wang
- National & Local Joint Engineering Laboratory for Municipal Sewage Resource Utilization Technology, Suzhou University of Science and Technology, Suzhou, 215009, China; School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China
| | - Yaoliang Shen
- National & Local Joint Engineering Laboratory for Municipal Sewage Resource Utilization Technology, Suzhou University of Science and Technology, Suzhou, 215009, China; School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou, 215009, China
| | - Xiaoming Ji
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China
| | - Dianhai Yang
- State Key Laboratory of Pollution Control and Resources Reuse, Tongji University, Shanghai, 200092, China
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25
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Zhang Q, Xu X, Zhang R, Shao B, Fan K, Zhao L, Ji X, Ren N, Lee DJ, Chen C. The mixed/mixotrophic nitrogen removal for the effective and sustainable treatment of wastewater: From treatment process to microbial mechanism. WATER RESEARCH 2022; 226:119269. [PMID: 36279615 DOI: 10.1016/j.watres.2022.119269] [Citation(s) in RCA: 26] [Impact Index Per Article: 13.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2022] [Revised: 08/25/2022] [Accepted: 10/16/2022] [Indexed: 06/16/2023]
Abstract
Biological nitrogen removal (BNR) is one of the most important environmental concerns in the field of wastewater treatment. The conventional BNR process based on heterotrophic nitrogen removal (HeNR) is suffering from several limitations, including external carbon source dependence, excessive sludge production, and greenhouse gas emissions. Through the mediation of autotrophic nitrogen removal (AuNR), mixed/mixotrophic nitrogen removal (MixNR) offers a viable solution to the optimization of the BNR process. Here, the recent advance and characteristics of MixNR process guided by sulfur-driven autotrophic denitrification (SDAD) and anammox are summarized in this review. Additionally, we discuss the functional microorganisms in different MixNR systems, shedding light on metabolic mechanisms and microbial interactions. The significance of MixNR for carbon reduction in the BNR process has also been noted. The knowledge gaps and the future research directions that may facilitate the practical application of the MixNR process are highlighted. Overall, the prospect of the MixNR process is attractive, and this review will provide guidance for the future implementation of MixNR process as well as deciphering the microbially metabolic mechanisms.
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Affiliation(s)
- Quan Zhang
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Room 1433, Harbin, Heilongjiang 150090, China
| | - Xijun Xu
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Room 1433, Harbin, Heilongjiang 150090, China
| | - Ruochen Zhang
- School of Civil and Transportation Engineering, Hebei University of Technology, Tianjin 300401, China
| | - Bo Shao
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Room 1433, Harbin, Heilongjiang 150090, China
| | - Kaili Fan
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Room 1433, Harbin, Heilongjiang 150090, China
| | - Lei Zhao
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Room 1433, Harbin, Heilongjiang 150090, China
| | - Xiaoming Ji
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing 210095, China
| | - Nanqi Ren
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Room 1433, Harbin, Heilongjiang 150090, China
| | - Duu-Jong Lee
- Department of Mechanical Engineering, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China; Department of Chemical Engineering and Materials Science, Yuan Ze University, Chung-li, 32003, Taiwan
| | - Chuan Chen
- State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, Room 1433, Harbin, Heilongjiang 150090, China.
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26
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Zhou L, Zhao B, Lin Y, Shao Z, Zeng R, Shen Y, Zhang W, Jian Y, Zhuang WQ. Identification of dissimilatory nitrate reduction to ammonium (DNRA) and denitrification in the dynamic cake layer of a full-scale anoixc dynamic membrane bioreactor for treating hotel laundry wastewater. CHEMOSPHERE 2022; 307:136078. [PMID: 35985382 DOI: 10.1016/j.chemosphere.2022.136078] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/16/2022] [Revised: 08/02/2022] [Accepted: 08/13/2022] [Indexed: 06/15/2023]
Abstract
Identification of dissimilatory nitrate reduction to ammonium (DNRA) and denitrification in the dynamic cake layer of a full-scale anoixc dynamic membrane bioreactor (AnDMBR) for treating hotel laundry wastewater was studied. A series of experiments were conducted to understand the contributions of DNRA and canonical denitrification activities in the dynamic cake layer of the AnDMBR. The dynamic cake layer developed included two phases - a steady transmembrane pressure (TMP) increase at 0.24 kPa/day followed by a sharp TMP jump at 1.26 kPa/day four to five days after the AnDMBR start-up. The nitrogen mass balance results showed that canonical denitrification was predominant during the development of the dynamic cake layer. However, DNRA activity and accumulation of bacteria equipped with a complete DNRA pathway showed a positive correlation to the development of the dynamic cake layer. Our metagenomic analysis identified an approximately 18% of the dynamic cake layer bacterial community has a complete DNRA pathway. Pannonibacter (1%), Thauera (0.8%) and Pseudomonas (3%) contained all genes encoding for funcional enzymes of both DNRA (nitrate reductase and DNRA nitrite reductase) and denitrification (nitrate reductase, nitrous oxide reductase and nitric oxide reductase). No other metagenome-assembled genomes (MAGs) possessed a complete cononical denitrification pathway, indicating food-chain-like interactions of denitrifiers in the dynamic cake layer. We found that COD loading rate could be used to control DNRA and canonical denitrification activities during the dynamic cake layer formation.
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Affiliation(s)
- Lijie Zhou
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China.
| | - Bikai Zhao
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Yuanzhong Lin
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Zhiyuan Shao
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Rongjie Zeng
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Yichang Shen
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Wenyu Zhang
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Yixin Jian
- College of Chemistry and Environmental Engineering, Shenzhen University, Shenzhen, 518060, China
| | - Wei-Qin Zhuang
- Department of Civil and Environmental Engineering, The University of Auckland, Auckland, 1142, New Zealand
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27
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Ya T, Liu J, Zhang M, Wang Y, Huang Y, Hai R, Zhang T, Wang X. Metagenomic insights into the symbiotic relationship in anammox consortia at reduced temperature. WATER RESEARCH 2022; 225:119184. [PMID: 36206682 DOI: 10.1016/j.watres.2022.119184] [Citation(s) in RCA: 35] [Impact Index Per Article: 17.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/09/2022] [Revised: 09/27/2022] [Accepted: 09/29/2022] [Indexed: 06/16/2023]
Abstract
Anammox as a promising biological nitrogen removal technology has attracted much attention. However, cold temperature would limit its wide application and little is known about the microbial interactions between anammox bacteria (AnAOB) and heterotrophic bacteria at cold temperature. Here, we observed reduced temperature (25-15 °C) promoted the secretion of EPS and thus stimulated bigger size of granular sludge in a laboratory-scale anammox reactor. We further combined co-occurrence network analysis and genome-centered metagenomics to explore the potential interactions between AnAOB and heterotrophic bacteria. Network analysis suggested 22 out of 25 positively related species were reported as definite heterotrophic bacteria in subnetwork of AnAOB. Genome-centered metagenomics analysis yielded 23 metagenomic assembly genomes (MAGs), and we found that Acidobacteriota-affiliated bacteria could biosynthesize most polysaccharides (PS) precursors and contain the most glycosyltransferases and transporters to facilitate exopolysaccharides biosynthesis, together with partial PS precursors produced by AnAOB. AMX1 as the only anammox genome could synthesize most amino acids and cross feed with some heterotrophs to affect the extracellular protein function. Additionally, Bacteroidota, Planctomycetota, Chloroflexota, and Proteobacteria could contribute folate and molybdopterin cofactor for AMX1 to benefit their activity and growth. Superphylum Patescibacteria could survive by cross-feeding with AnAOB and heterotrophic organisms about organic compounds (Glyceraldehyde-3P and lactate). These cross-feedings maintained the stability of anammox reactor performance and emphasize the importance of heterotrophs in anammox system at reduced temperature.
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Affiliation(s)
- Tao Ya
- Beijing Engineering Research Center of Environmental Material for Water Purification, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Junyu Liu
- Beijing Engineering Research Center of Environmental Material for Water Purification, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Minglu Zhang
- State Environmental Protection Key Laboratory of Food Chain Pollution Control, Beijing Technology and Business University, Beijing 100048, China
| | - Yulin Wang
- State Key Laboratory of Microbial Technology, Shandong University, Qingdao 266000, PR China
| | - Yan Huang
- Beijing Engineering Research Center of Environmental Material for Water Purification, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Reti Hai
- Beijing Engineering Research Center of Environmental Material for Water Purification, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China
| | - Tingting Zhang
- Beijing Engineering Research Center of Environmental Material for Water Purification, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
| | - Xiaohui Wang
- Beijing Engineering Research Center of Environmental Material for Water Purification, College of Chemical Engineering, Beijing University of Chemical Technology, Beijing 100029, China.
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Venturin B, Rodrigues HC, Bonassa G, Hollas CE, Bolsan AC, Antes FG, De Prá MC, Fongaro G, Treichel H, Kunz A. Key enzymes involved in anammox-based processes for wastewater treatment: An applied overview. WATER ENVIRONMENT RESEARCH : A RESEARCH PUBLICATION OF THE WATER ENVIRONMENT FEDERATION 2022; 94:e10780. [PMID: 36058650 DOI: 10.1002/wer.10780] [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: 03/20/2022] [Revised: 07/29/2022] [Accepted: 08/08/2022] [Indexed: 06/15/2023]
Abstract
The anaerobic ammonium oxidation (anammox) process has attracted significant attention as an economic, robustness, and sustainable method for the treatment of nitrogen (N)-rich wastewater. Anammox bacteria (AnAOB) coexist with other microorganisms, and particularly with ammonia-oxidizing bacteria (AOB) and/or heterotrophic bacteria (HB), in symbiosis in favor of the substrate requirement (ammonium and nitrite) of the AnAOB being supplied by these other organisms. The dynamics of these microbial communities have a significant effect on the N-removal performance, but the corresponding metabolic pathways are still not fully understood. These processes involve many common metabolites that may act as key factors to control the symbiotic interactions between these organisms, to maximize N-removal efficiency from wastewater. Therefore, this work overviews the current state of knowledge about the metabolism of these microorganisms including key enzymes and intermediate metabolites and summarizes already reported experiences based on the employment of certain metabolites for the improvement of N-removal using anammox-based processes. PRACTITIONER POINTS: Approaches knowledge about the biochemistry and metabolic pathways involved in anammox-based processes. Some molecular tools can be used to determine enzymatic activity, serving as an optimization in nitrogen removal processes. Enzymatic evaluation allied to the physical-chemical and biomolecular analysis of the nitrogen removal processes expands the application in different effluents.
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Affiliation(s)
- Bruno Venturin
- Universidade Estadual do Oeste do Paraná, Cascavel, Paraná, Brazil
| | | | - Gabriela Bonassa
- Universidade Estadual do Oeste do Paraná, Cascavel, Paraná, Brazil
| | | | | | | | | | - Gislaine Fongaro
- Universidade Federal de Santa Catarina, Florianópolis, Santa Catarina, Brazil
| | - Helen Treichel
- Universidade Federal da Fronteira Sul, Erechim, Rio Grande do Sul, Brazil
| | - Airton Kunz
- Universidade Estadual do Oeste do Paraná, Cascavel, Paraná, Brazil
- Embrapa Suínos e Aves, Concórdia, Santa Catarina, Brazil
- Universidade Federal da Fronteira Sul, Erechim, Rio Grande do Sul, Brazil
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Pimenov NV, Nikolaev YA, Dorofeev AG, Grachev VA, Kallistova AY, Kanapatskii TA, Litti YV, Gruzdev EV, Begmatov SA, Ravin NV, Mardanov AV. Introduction of Exogenous Activated Sludge as a Way to Enhance the Efficiency of Nitrogen Removal in the Anammox Process. Microbiology (Reading) 2022. [DOI: 10.1134/s0026261722300178] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022] Open
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Lin Z, Ma K, Yang Y. Nitrous Oxide Emission from Full-Scale Anammox-Driven Wastewater Treatment Systems. LIFE (BASEL, SWITZERLAND) 2022; 12:life12070971. [PMID: 35888061 PMCID: PMC9317218 DOI: 10.3390/life12070971] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 05/20/2022] [Revised: 06/16/2022] [Accepted: 06/27/2022] [Indexed: 11/23/2022]
Abstract
Wastewater treatment plants (WWTPs) are important contributors to global greenhouse gas (GHG) emissions, partly due to their huge emission of nitrous oxide (N2O), which has a global warming potential of 298 CO2 equivalents. Anaerobic ammonium-oxidizing (anammox) bacteria provide a shortcut in the nitrogen removal pathway by directly transforming ammonium and nitrite to nitrogen gas (N2). Due to its energy efficiency, the anammox-driven treatment has been applied worldwide for the removal of inorganic nitrogen from ammonium-rich wastewater. Although direct evidence of the metabolic production of N2O by anammox bacteria is lacking, the microorganisms coexisting in anammox-driven WWTPs could produce a considerable amount of N2O and hence affect the sustainability of wastewater treatment. Thus, N2O emission is still one of the downsides of anammox-driven wastewater treatment, and efforts are required to understand the mechanisms of N2O emission from anammox-driven WWTPs using different nitrogen removal strategies and develop effective mitigation strategies. Here, three main N2O production processes, namely, hydroxylamine oxidation, nitrifier denitrification, and heterotrophic denitrification, and the unique N2O consumption process termed nosZ-dominated N2O degradation, occurring in anammox-driven wastewater treatment systems, are summarized and discussed. The key factors influencing N2O emission and mitigation strategies are discussed in detail, and areas in which further research is urgently required are identified.
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Recent Advances in Autotrophic Biological Nitrogen Removal for Low Carbon Wastewater: A Review. WATER 2022. [DOI: 10.3390/w14071101] [Citation(s) in RCA: 4] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 02/01/2023]
Abstract
Due to carbon source dependence, conventional biological nitrogen removal (BNR) processes based on heterotrophic denitrification are suffering from great bottlenecks. The autotrophic BNR process represented by sulfur-driven autotrophic denitrification (SDAD) and anaerobic ammonium oxidation (anammox) provides a viable alternative for addressing low carbon wastewater. Whether for low carbon municipal wastewater or industrial wastewater with high nitrogen, the SDAD and anammox process can be suitably positioned accordingly. Herein, the recent advances and challenges to autotrophic BNR process guided by SDAD and anammox are systematically reviewed. Specifically, the present applications and crucial operation factors were discussed in detail. Besides, the microscopic interpretation of the process was deepened in the viewpoint of functional microbial species and their physiological characteristics. Furthermore, the current limitations and some future research priorities over the applications were identified and discussed from multiple perspectives. The obtained knowledge would provide insights into the application and optimization of the autotrophic BNR process, which will contribute to the establishment of a new generation of efficient and energy-saving wastewater nitrogen removal systems.
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