1
|
Jian C, Hao Y, Liu R, Qi X, Chen M, Liu N. Mixotrophic denitrification process driven by lime sulfur and butanediol: Denitrification performance and metagenomic analysis. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 903:166654. [PMID: 37647948 DOI: 10.1016/j.scitotenv.2023.166654] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/06/2023] [Revised: 08/24/2023] [Accepted: 08/26/2023] [Indexed: 09/01/2023]
Abstract
Heterotrophic sulfur-based autotrophic denitrification is a promising biological denitrification technology for low COD/TN (C/N) wastewater due to its high efficiency and low cost. Compared to the conventional autotrophic denitrification process driven by elemental sulfur, the presence of polysulfide in the system can promote high-speed nitrogen removal. However, autotrophic denitrification mediated by polysulfide has not been reported. This study investigated the denitrification performance and microbial metabolic mechanism of heterotrophic denitrification, sulfur-based autotrophic denitrification, and mixotrophic denitrification using lime sulfur and butanediol as electron donors. When the influent C/N was 1, the total nitrogen removal efficiency of the mixotrophic denitrification process was 1.67 and 1.14 times higher than that of the heterotrophic and sulfur-based autotrophic denitrification processes, respectively. Microbial community alpha diversity and principal component analysis indicated different electron donors lead to different evolutionary directions in microbial communities. Metagenomic analysis showed the enriched denitrifying bacteria (Thauera, Pseudomonas, and Pseudoxanthomonas), dissimilatory nitrate reduction to ammonia bacteria (Hydrogenophaga), and sulfur oxidizing bacteria (Thiobacillus) can stably support nitrate reduction. Analysis of metabolic pathways revealed that complete denitrification, dissimilatory nitrate reduction to ammonia, and sulfur disproportionation are the main pathways of the N and S cycle. This study demonstrates the feasibility of a mixotrophic denitrification process driven by a combination of lime sulfur and butanediol as a cost-effective solution for treating nitrogen pollution in low C/N wastewater and elucidates the N and S metabolic pathways involved.
Collapse
Affiliation(s)
- Chuanqi Jian
- Department of Ecology, College of Life Science and Technology, Jinan University, Guangzhou 510632, Guangdong, China
| | - Yanru Hao
- Department of Ecology, College of Life Science and Technology, Jinan University, Guangzhou 510632, Guangdong, China
| | - Rentao Liu
- School of Environment, Jinan University, Guangzhou 510632, Guangdong, China
| | - Xiaochen Qi
- Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, Guangdong, China
| | - Minmin Chen
- Guangdong Environmental Protection Engineering Vocational College, Guangzhou 510655, Guangdong, China
| | - Na Liu
- Department of Ecology, College of Life Science and Technology, Jinan University, Guangzhou 510632, Guangdong, China.
| |
Collapse
|
2
|
Yang J, Zhang M, Chen C, Zhao D, Chen Y, An S. Effect of Tubifex tubifex on the purification function of saturated vertical flow constructed wetlands for effluents with varying C/N ratios. CHEMOSPHERE 2023; 340:139872. [PMID: 37598942 DOI: 10.1016/j.chemosphere.2023.139872] [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: 06/18/2023] [Revised: 08/08/2023] [Accepted: 08/17/2023] [Indexed: 08/22/2023]
Abstract
The improvement effect of Tubifex tubifex on the pollutant removal efficiencies (REs) of vertical flow constructed wetlands (VF-CWs) treating wastewater with various C/N ratios was explored. The experiment was conducted in pilot-scale saturated VF-CWs, being added different densities of T. tubifex and fed synthetic wastewater with successive C/N ratios of 0.5, 1.5, 3.0 and 6.0. The results suggest that T. tubifex addition and the influent C/N ratio had an interactive effect, i.e., T. tubifex addition improved NOx--N, NH4+-N, TN and COD REs by 36.7%, 56.5%, 22.6%, and 10.0%, respectively, under low C/N ratios, while high C/N ratios inhibited this improvement. Low-density T. tubifex addition significantly increased substrate dissolved oxygen (DO) by retarding excessive soil organic matter (OM) accumulation. With T. tubifex addition, an improvement in bacterial diversity, the relative abundance of N-cycle and fermentative bacteria, and N-cycle functional genes was only observed in substrates under low C/N ratios. T. tubifex can improve the purification function of saturated VF-CWs, but this strategy strongly depends on both the influent C/N ratio and density of T. tubifex addition.
Collapse
Affiliation(s)
- Jiqiang Yang
- College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, 225009, PR China
| | - Miao Zhang
- Jiangsu Environmental Engineering Technology Co., Ltd, Nanjing, 210036, PR China
| | - Chen Chen
- Institute of Wetland Ecology, School of Life Science, Nanjing University, Nanjing, 210093, PR China
| | - Dehua Zhao
- Institute of Wetland Ecology, School of Life Science, Nanjing University, Nanjing, 210093, PR China.
| | - Yun Chen
- College of Bioscience and Biotechnology, Yangzhou University, Yangzhou, 225009, PR China
| | - Shuqing An
- Institute of Wetland Ecology, School of Life Science, Nanjing University, Nanjing, 210093, PR China
| |
Collapse
|
3
|
Cheng Q, Tian H, Guo X, Feng S, Du E, Peng M, Zhang J. Advanced synergetic nitrogen removal of municipal wastewater using oxidation products of refractory organic matters in secondary effluent by biogenic manganese oxides as carbon source. WATER RESEARCH 2023; 241:120163. [PMID: 37276654 DOI: 10.1016/j.watres.2023.120163] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 01/26/2023] [Revised: 04/17/2023] [Accepted: 05/31/2023] [Indexed: 06/07/2023]
Abstract
Due to the high operational cost and secondary pollution of the conventional advanced nitrogen removal of municipal wastewater, a novel concept and technique of advanced synergetic nitrogen removal of partial-denitrification anammox and denitrification was proposed, which used the oxidation products of refractory organic matters in the secondary effluent of municipal wastewater treatment plant (MWWTP) by biogenic manganese oxides (BMOs) as carbon source. When the influent NH4+-N in the denitrifying filter was about 1.0, 2.0, 3.0, 4.0, 5.0 and 7.0 mg/L, total nitrogen (TN) in the effluent decreased from about 22 mg/L to 11.00, 7.85, 6.85, 5.20, 4.15 and 2.09 mg/L, and the corresponding removal rate was 49.15, 64.82, 69.40, 76.70, 81.36 and 90.58%, respectively. The proportional contribution of the partial-denitrification anammox pathway to the TN removal was 12.00, 26.45, 39.70, 46.04, 54.97 and 64.01%, and the actual CODcr consumption of removing 1 mg TN was 0.75, 1.43, 1.26, 1.17, 1.08 and 0.99 mg, respectively, which was much lower than the theoretical CODcr consumption of denitrification. Furthermore, CODcr in the effluent decreased to 8.12 mg/L with a removal rate of 72.40%, and the removed organic matters were mainly non-fluorescent organic matters. Kinds of denitrifying bacteria, anammox bacteria, hydrolytic bacteria and manganese oxidizing bacteria (MnOB) were identified in the denitrifying filter, which demonstrated that the advanced synergetic nitrogen removal was achieved. This novel technology presented the advantages of high efficiency of TN and CODcr removal, low operational cost and no secondary pollution.
Collapse
Affiliation(s)
- Qingfeng Cheng
- School of Urban Construction, Changzhou University, Changzhou 213164, PR China.
| | - Hui Tian
- College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, PR China
| | - Xujing Guo
- College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, PR China.
| | - Shanshan Feng
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, PR China
| | - Erdeng Du
- School of Urban Construction, Changzhou University, Changzhou 213164, PR China
| | - Mingguo Peng
- School of Urban Construction, Changzhou University, Changzhou 213164, PR China
| | - Jie Zhang
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, PR China
| |
Collapse
|
4
|
Dang Q, Zhao X, Xi B, Zhang C, He L. The key role of denitrification and dissimilatory nitrate reduction in nitrogen pollution along vertical landfill profiles from metagenomic perspective. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 342:118300. [PMID: 37263034 DOI: 10.1016/j.jenvman.2023.118300] [Citation(s) in RCA: 2] [Impact Index Per Article: 2.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/15/2023] [Revised: 05/23/2023] [Accepted: 05/28/2023] [Indexed: 06/03/2023]
Abstract
Landfill are persistent sources of nitrogen (N) pollution even in the decades after closure. However, the biological pathways of N-pollution, particularly N2O and NH4+, at different landfill depths have received little attention. In this study, metagenomic analysis was conducted on landfill refuse from vertical reservoir profiles in two closed landfills named XT and MT. NH4+ concentrations were found to be higher in deeper layers of MT, while greater potential for N2O emissions occurred in XT and the shallow layers of MT. Furthermore, the community structure and function of N-metabolizing microbes were more strongly defined by landfill depth than landfill type. Denitrification, involving abundant nirK and norB genes, was identified as the major pathway for N2O production in both XT and MT-shallow, while dissimilatory nitrate reduction with abundant nirBD genes was identified as the major pathway for NH4+ accumulation. Microbes of norB-type and nirBD-type were positively affected by NO3- in XT, whereas negatively affected by contents of organic material and moisture in MT-shallow. The mechanism by which nitrogen fixation, with abundant nifH genes, contributes to NH4+ accumulation in MT-deep should be further elucidated. These findings can provide a theoretical basis for governing scientific N-pollution control strategies throughout the entire landfill process.
Collapse
Affiliation(s)
- Qiuling Dang
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; State Environmental Protection Key Laboratory of Hazardous Waste Identification and Risk Control, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Xinyu Zhao
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; State Environmental Protection Key Laboratory of Hazardous Waste Identification and Risk Control, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Beidou Xi
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China.
| | - Chuanyan Zhang
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; State Environmental Protection Key Laboratory of Hazardous Waste Identification and Risk Control, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| | - Liangzi He
- State Key Laboratory of Environmental Criteria and Risk Assessment, Chinese Research Academy of Environmental Sciences, Beijing 100012, China; State Environmental Protection Key Laboratory of Hazardous Waste Identification and Risk Control, Chinese Research Academy of Environmental Sciences, Beijing 100012, China
| |
Collapse
|
5
|
Zhang LZ, He W, Huang FY, He W, Zhou P, Chen C, Rensing C, Brandt KK, He J, Liu F, Zhao Y, Guo H. Response of microbial taxonomic and nitrogen functional attributes to elevated nitrate in suburban groundwater. THE SCIENCE OF THE TOTAL ENVIRONMENT 2023; 874:162524. [PMID: 36868285 DOI: 10.1016/j.scitotenv.2023.162524] [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] [Received: 11/06/2022] [Revised: 02/05/2023] [Accepted: 02/24/2023] [Indexed: 06/18/2023]
Abstract
Anthropogenic nitrogen (N) input has led to elevated levels of nitrate nitrogen (NO3--N) in the groundwater. However, insights into the responses of the microbial community and its N metabolic functionality to elevated NO3--N in suburban groundwater are still limited. Here, we explored the microbial taxonomy, N metabolic attributes, and their responses to NO3--N pollution in groundwaters from Chaobai River catchment (CR) and Huai River catchment (HR) in Beijing, China. Results showed that average NO3--N and NH4+-N concentrations in CR groundwater were 1.7 and 3.0 folds of those in HR. NO3--N was the dominant nitrogen specie both in HR and CR groundwater (over 80 %). Significantly different structures and compositions of the microbial communities and N cycling gene profiles were found between CR groundwater and HR groundwater (p < 0.05), with CR groundwater harboring significantly lower microbial richness and abundance of N metabolic genes. However, denitrification was the dominant microbial N cycling process in both CR and HR groundwater. Strong associations among NO3--N, NH4+-N, microbial taxonomic, and N functional attributes were found (p < 0.05), suggesting denitrifiers and Candidatus_Brocadia might serve as potential featured biomarkers for the elevated NO3--N and NH4+-N concentration in groundwater. Path analysis further revealed the significant effect of NO3--N on the overall microbial N functionality and microbial denitrification (p < 0.05). Collectively, our results provide field evidence that elevated levels of NO3--N and NH4+-N under different hydrogeologic conditions had a significant effect on the microbial taxonomic and N functional attributes in groundwater, with potential implications for improving sustainable N management and risk assessment of groundwater.
Collapse
Affiliation(s)
- Ling-Zhi Zhang
- School of Water Resources and Environment & Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences (Beijing), Beijing 100083, China
| | - Wei He
- Beijing Municipal Research Institute of Eco-Environmental Protection, Beijing 100037, China
| | - Fu-Yi Huang
- Institute of Urban Environment, Chinese Academy of Sciences, 1799 Jimei Road, Xiamen 361021, China
| | - Wei He
- School of Water Resources and Environment & Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences (Beijing), Beijing 100083, China
| | - Pengpeng Zhou
- School of Water Resources and Environment & Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences (Beijing), Beijing 100083, China
| | - Cuibai Chen
- School of Water Resources and Environment & Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences (Beijing), Beijing 100083, China
| | - Christopher Rensing
- College of Resources and Environment, Fujian Agriculture and Forestry University, Fuzhou 350002, China
| | - Kristian Koefoed Brandt
- Department of Plant and Environmental Science, Faculty of Science, University of Copenhagen, Frederiksberg 1871, Denmark; Sino-Danish Center for Education and Research, Beijing, China
| | - Jiangtao He
- School of Water Resources and Environment & Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences (Beijing), Beijing 100083, China
| | - Fei Liu
- School of Water Resources and Environment & Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences (Beijing), Beijing 100083, China
| | - Yi Zhao
- School of Water Resources and Environment & Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences (Beijing), Beijing 100083, China.
| | - Huaming Guo
- School of Water Resources and Environment & Key Laboratory of Groundwater Conservation of MWR, China University of Geosciences (Beijing), Beijing 100083, China.
| |
Collapse
|
6
|
Cheng Q, Liu Z, Huang Y, Feng S, Du E, Peng M, Zhang J. Advanced nitrogen removal performance and microbial community structure of a lab-scale denitrifying filter with in-situ formation of biogenic manganese oxides. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2023; 331:117299. [PMID: 36642053 DOI: 10.1016/j.jenvman.2023.117299] [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: 10/27/2022] [Revised: 01/08/2023] [Accepted: 01/11/2023] [Indexed: 06/17/2023]
Abstract
Advanced nitrogen removal faces the challenges of high operational cost resulted from the additional carbon source and secondary pollution caused by inaccurate carbon source dosage in municipal wastewater. To address these problems, a novel carbon source was developed, which was the oxidation products of refractory organic matters in the secondary effluent of municipal wastewater treatment plant (MWWTP) by in-situ generated biogenic manganese oxides (BMOs) in the denitrifying filter. In the steady phase, the effluent chemical oxygen demand (CODcr), NO3--N and total nitrogen (TN) in the denitrifying filter 2# with BMOs was 11.27, 9.03 and 10.36 mg/L, and the corresponding removal efficiency was 54.79%, 51.85% and 48.03%, respectively, which was significantly higher than those in the control denitrifying filter 1# that the removal efficiency of CODcr, NO3--N and TN was only 32.30%, 28.58% and 29.36%, respectively. Kinds of denitrifying bacteria (Candidatus Competibacter, Defluviicoccus, Dechloromonas, Candidatus Competibacter, Dechloromonas, Pseudomonas, Thauera, Acinetobacter, Denitratisoma, Anaerolineae and Denitratisoma) and anammox bacteria (Pirellula, Gemmata, Anammoximicrobium and Brocadia) were identified in the denitrifying filters 1# and 2#, which explained why the actual CODcr consumption (1.55 and 1.44 mg) of reducing 1 mg NO3--N was much lower than the theoretical CODcr consumption. While manganese oxidizing bacteria (MnOB, Bacillus, Crenothrix and Pedomicrobium) was only identified in the denitrifying filter 2#. This novel technology presented the advantages of no additional carbon source, low operational cost and no secondary pollution. Therefore, the novel technology has superlative application value and broad application prospect.
Collapse
Affiliation(s)
- Qingfeng Cheng
- School of Urban Construction, Changzhou University, Changzhou 213164, PR China; College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, PR China.
| | - Zongyang Liu
- College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, PR China
| | - Yang Huang
- College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, PR China
| | - Shanshan Feng
- School of Environmental Science and Engineering, Changzhou University, Changzhou 213164, PR China
| | - Erdeng Du
- School of Urban Construction, Changzhou University, Changzhou 213164, PR China
| | - Mingguo Peng
- School of Urban Construction, Changzhou University, Changzhou 213164, PR China
| | - Jie Zhang
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, PR China
| |
Collapse
|
7
|
Duan M, Wang L, Song X, Zhang X, Wang Z, Lei J, Yan M. Assessment of the rhizosphere fungi and bacteria recruited by sugarcane during smut invasion. Braz J Microbiol 2023; 54:385-395. [PMID: 36371518 PMCID: PMC9944363 DOI: 10.1007/s42770-022-00871-6] [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: 02/22/2022] [Accepted: 11/07/2022] [Indexed: 11/15/2022] Open
Abstract
Whip smut is one of the most serious and widely spread sugarcane diseases. Plant-associated microbes play various roles in conferring advantages to the host plant. Understanding the microbes associated with sugarcane roots will help develop strategies for the biocontrol of smut. Therefore, the present study explored microbe-mediated sugarcane response to smut invasion via 16S rRNA and ITS metabarcoding survey of the rhizosphere soils of resistant and susceptible sugarcane varieties. The bacterial and fungal diversity in the rhizosphere soils differed between the resistant and susceptible varieties. The bacterial genera Sphingomonas, Microcoleus_Es-Yyy1400, Marmoricola, Reyranella, Promicromonospora, Iamia, Phenylobacterium, Aridibacter, Actinophytocola, and Edaphobacter and one fungal genus Cyphellophora were found associated with smut resistance in sugarcane. Detailed analysis revealed that the majority of bacteria were beneficial, including the actinomycete Marmoricola and Iamia and Reyranella with denitrification activity. Analysis of bacterial network interaction showed that three major groups interacted during smut invasion. Meanwhile, seven of these genera appeared to interact and promote each other's growth. Finally, functional annotation based on the Functional Annotation of Prokaryotic Taxa (FAPROTAX) database predicted that the abundant bacteria are dominated by oxygenic photoautotrophy, photoautotrophy, and phototrophy functions, which may be related to smut resistance in sugarcane. The present study thus provides new insights into the dynamics of the sugarcane rhizosphere microbial community during smut invasion.
Collapse
Affiliation(s)
- Mingzheng Duan
- Guangxi Key Laboratory of Sugarcane Biology, College of Agriculture, Guangxi University, 100 Daxue Rd, Nanning, 530004, China
| | - Lingqiang Wang
- Guangxi Key Laboratory of Sugarcane Biology, College of Agriculture, Guangxi University, 100 Daxue Rd, Nanning, 530004, China
| | - Xiupeng Song
- Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences; Sugarcane Research Center, Chinese Academy of Agricultural Sciences; Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi); Ministry of Agriculture, Guangxi Key Laboratory of Sugarcane Genetic Improvement, Nanning, 530007, China
| | - Xiaoqiu Zhang
- Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences; Sugarcane Research Center, Chinese Academy of Agricultural Sciences; Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi); Ministry of Agriculture, Guangxi Key Laboratory of Sugarcane Genetic Improvement, Nanning, 530007, China
| | - Zeping Wang
- Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences; Sugarcane Research Center, Chinese Academy of Agricultural Sciences; Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi); Ministry of Agriculture, Guangxi Key Laboratory of Sugarcane Genetic Improvement, Nanning, 530007, China
| | - Jingchao Lei
- Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences; Sugarcane Research Center, Chinese Academy of Agricultural Sciences; Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi); Ministry of Agriculture, Guangxi Key Laboratory of Sugarcane Genetic Improvement, Nanning, 530007, China
| | - Meixin Yan
- Sugarcane Research Institute, Guangxi Academy of Agricultural Sciences; Sugarcane Research Center, Chinese Academy of Agricultural Sciences; Key Laboratory of Sugarcane Biotechnology and Genetic Improvement (Guangxi); Ministry of Agriculture, Guangxi Key Laboratory of Sugarcane Genetic Improvement, Nanning, 530007, China.
| |
Collapse
|
8
|
Chu YX, Wang J, Jiang L, Tian G, He R. Intermittent aeration reducing N 2O emissions from bioreactor landfills with gas-water joint regulation. WASTE MANAGEMENT (NEW YORK, N.Y.) 2022; 139:309-320. [PMID: 34999438 DOI: 10.1016/j.wasman.2021.12.041] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/24/2021] [Revised: 12/04/2021] [Accepted: 12/29/2021] [Indexed: 06/14/2023]
Abstract
Landfills are important emission sources of atmospheric N2O, especially bioreactor landfills with leachate recirculation. In this study, N2O emissions were characterized in four bioreactor landfills with different ventilation methods, including intermittent (2-h aeration per 12 h or 4 h/d in continuous) and continuous aeration (20 h/d), in comparison to a traditional landfill without aeration. During the experiment, the N2O emissions from the landfill reactors with intermittent aeration were 7.48 and 7.15 mg, accounting for only 20.8% and 19.9% of those with continuous aeration, respectively. Continuous aeration was more favorable for the biodegradation of organic matter than intermittent aeration in the landfilled waste and leachate. Intermittent and continuous aeration could both effectively remove total nitrogen (TN) and NH4+-N with removal efficiencies above 64% in the leachate. In the experimental landfill reactors with gas-water joint regulation, the proportion of N2O-N to TN loss ranged from 0.02% to 0.75%. Luteimonas, Pseudomonas, Thauera, Pusillimonas and Comamonas were the dominant denitrifying bacteria in the landfill reactors. The denitrifying bacterial community in the landfilled waste was closely related to its degree of stabilization and nitrogenous compound concentrations in the landfilled waste and leachate. The NO3--N and NO2--N concentrations of leachate were the most important environmental factors affecting the succession of nirS-type and nirK-type denitrifying microbial communities in the landfilled waste. These findings indicated that intermittent aeration was an economical and effective way to accelerate the stabilization of landfilled waste and reduce the pollutants in leachate and N2O emissions during landfill mining and reclamation.
Collapse
Affiliation(s)
- Yi-Xuan Chu
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Jing Wang
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Lei Jiang
- Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China
| | - Guangming Tian
- Department of Environmental Engineering, Zhejiang University, Hangzhou 310058, China
| | - Ruo He
- Zhejiang Provincial Key Laboratory of Solid Waste Treatment and Recycling, School of Environmental Science and Engineering, Zhejiang Gongshang University, Hangzhou 310012, China; College of Environmental and Resource Science, Zhejiang University, Hangzhou 310058, China.
| |
Collapse
|
9
|
Liu C, Yan J, Huang Q, Liu H, Qiao C, Li R, Shen B, Shen Q. The addition of sawdust reduced the emission of nitrous oxide in pig manure composting by altering the bacterial community structure and functions. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2022; 29:3733-3742. [PMID: 34392479 DOI: 10.1007/s11356-021-15786-2] [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: 03/25/2021] [Accepted: 07/29/2021] [Indexed: 06/13/2023]
Abstract
Although composting, a measure to dispose agricultural waste, is widely accepted and applied, specific knowledge of microbially driven effects on nitrous oxide (N2O) emissions during composting remains limited. Here, we monitored the impact of sawdust on N2O emissions during pig manure composting. The results suggested that adding sawdust to the compost improved the compost temperature and reduced N2O emissions. The addition of sawdust significantly altered the bacterial community structure and enhanced community turnover during the composting process. The addition of sawdust significantly reduced the relative abundance of denitrification and ureolysis, while increasing the relative abundance of nitrogen fixation. Specifically, adding sawdust may reduce N2O emissions by reducing the relative abundance of Salinithrix, Truepera, Azomonas, Iamia, Silanimonas, Phycisphaera, and Gp21 during the thermophilic and mature phases of the composting period.
Collapse
Affiliation(s)
- Chao Liu
- Jiangsu Provincial Key Lab of Solid Organic Waste Utilization, Jiangsu Collaborative Innovation Center of Solid Organic Wastes, Educational Ministry Engineering Center of Resource-saving fertilizers, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
- The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
| | - Jiao Yan
- Jiangsu Provincial Key Lab of Solid Organic Waste Utilization, Jiangsu Collaborative Innovation Center of Solid Organic Wastes, Educational Ministry Engineering Center of Resource-saving fertilizers, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
- The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
| | - Qian Huang
- Jiangsu Provincial Key Lab of Solid Organic Waste Utilization, Jiangsu Collaborative Innovation Center of Solid Organic Wastes, Educational Ministry Engineering Center of Resource-saving fertilizers, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
- The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
| | - Hongjun Liu
- Jiangsu Provincial Key Lab of Solid Organic Waste Utilization, Jiangsu Collaborative Innovation Center of Solid Organic Wastes, Educational Ministry Engineering Center of Resource-saving fertilizers, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
- The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
| | - Cece Qiao
- Jiangsu Provincial Key Lab of Solid Organic Waste Utilization, Jiangsu Collaborative Innovation Center of Solid Organic Wastes, Educational Ministry Engineering Center of Resource-saving fertilizers, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
- The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
| | - Rong Li
- Jiangsu Provincial Key Lab of Solid Organic Waste Utilization, Jiangsu Collaborative Innovation Center of Solid Organic Wastes, Educational Ministry Engineering Center of Resource-saving fertilizers, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
- The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
| | - Biao Shen
- Jiangsu Provincial Key Lab of Solid Organic Waste Utilization, Jiangsu Collaborative Innovation Center of Solid Organic Wastes, Educational Ministry Engineering Center of Resource-saving fertilizers, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China.
- The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China.
- College of Resources and Environmental Sciences, Nanjing Agricultural University, Nanjing, 210095, China.
| | - Qirong Shen
- Jiangsu Provincial Key Lab of Solid Organic Waste Utilization, Jiangsu Collaborative Innovation Center of Solid Organic Wastes, Educational Ministry Engineering Center of Resource-saving fertilizers, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
- The Key Laboratory of Plant Immunity, Nanjing Agricultural University, Nanjing, 210095, Jiangsu, People's Republic of China
| |
Collapse
|
10
|
Tian Z, Zhou N, You W, He D, Chang F, Zheng M. Mitigating NO and N 2O emissions from a pilot-scale oxidation ditch using bioaugmentation of immobilized aerobic denitrifying bacteria. BIORESOURCE TECHNOLOGY 2021; 340:125704. [PMID: 34375792 DOI: 10.1016/j.biortech.2021.125704] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/10/2021] [Revised: 07/27/2021] [Accepted: 07/28/2021] [Indexed: 06/13/2023]
Abstract
Nitrous oxide (N2O) emission from wastewater treatment plants (WWTPs) requires urgent mitigation because of its significant contribution to the greenhouse effect. In this study, bioaugmentation was applied in a pilot-scale oxidation ditch with the aerobic denitrifying bacteria strain PCN-1 immobilized on polyurethane biocarriers, which demonstrated effective N2O mitigation. Microbial community analysis suggested that the bioaugmentation facilitated a symbiotic relationship of the bacterial populations between the activated sludge and the biocarriers. The denitrifying bacteria with well-known N2O reducing capabilities predominated on the biocarriers. Correspondingly, the increases of denitrifying genes and NO and N2O reductase provided evidence for the enhanced genetic potential for NO and N2O reduction. Besides, the enriched comammox Nitrospira on the biocarriers is proposed as another significant driver for N2O mitigation by avoiding nitrite accumulation. In addition, the bioaugmentation enhanced the stability and recovery capability of the system in the ammonia overload and aeration failure shock tests.
Collapse
Affiliation(s)
- Zhichao Tian
- Key Laboratory of Regional Energy Systems Optimization, Ministry of Education, College of Environmental Science and Technology, North China Electric Power University, Beijing 102206, China
| | - Nan Zhou
- State Key Joint Laboratory of Environment Simulation and Pollution Control, School of Environment, Tsinghua University, Beijing 100084, China
| | - Wenbo You
- Key Laboratory of Regional Energy Systems Optimization, Ministry of Education, College of Environmental Science and Technology, North China Electric Power University, Beijing 102206, China
| | - Da He
- Key Laboratory of Ecological Impacts of Hydraulic Projects and Restoration of Aquatic Ecosystem of Ministry of Water Resources, Institute of Hydroecology, Ministry of Water Resources & Chinese Academy of Sciences, Wuhan, China
| | - Fang Chang
- Marine Resources Research Centre, Tianjin Research Institute for Water Transport Engineering, M.O.T., Tianjin 300456, China
| | - Maosheng Zheng
- Key Laboratory of Regional Energy Systems Optimization, Ministry of Education, College of Environmental Science and Technology, North China Electric Power University, Beijing 102206, China.
| |
Collapse
|
11
|
Wang SS, Cheng HY, Zhang H, Su SG, Sun YL, Wang HC, Han JL, Wang AJ, Guadie A. Sulfur autotrophic denitrification filter and heterotrophic denitrification filter: Comparison on denitrification performance, hydrodynamic characteristics and operating cost. ENVIRONMENTAL RESEARCH 2021; 197:111029. [PMID: 33744267 DOI: 10.1016/j.envres.2021.111029] [Citation(s) in RCA: 23] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/26/2020] [Revised: 02/11/2021] [Accepted: 03/13/2021] [Indexed: 06/12/2023]
Abstract
Sulfur autotrophic denitrification (SAD) process, as an alternative to heterotrophic denitrification (HD) filter, receives growing interest in polishing the effluent from secondary sewage treatment. Although individual studies have indicated several advantages of SAD over HD, rare study has compared these two systems under identical condition and by using real secondary effluent. In this study, two small pilot scale filters (SAD and HD) were designed with identical configuration and operated parallelly by feeding the real secondary effluent from a WWTP. The results showed SAD filter can be started up without the addition of soluble electron donor, although the time (14 days) was about 3 times longer than that of HD filter. The nitrate removal rate of SAD filter at HRT of 1.4 h was measured as 0.268 ± 0.047 kg N/(m3∙d). Similar value was observed in HD filter with supplementing 90 mg/L COD. The COD concentration of effluent always kept lower than that of influent in SAD filter but not in HD filter. In addition, SAD filter could maintain a stable denitrification performance without backwash for 15 days, while decline of nitrate removal rate was observed in HD filter just 2 days after stopping the backwash. This different behavior was further confirmed as the SAD filter had a better hydraulic flow pattern. Analysis according to high-throughput 16S rRNA gene-based Illumina MiSeq sequencing clearly showed the microbial community evolution and differentiation among the samples of seed sludge, SAD and HD filters. Finally, the economic assessment was carried out, showing the operation cost of SAD filter was over 50% lower than that of HD filter.
Collapse
Affiliation(s)
- Shu-Sen Wang
- Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China; University of Chinese Academy of Sciences, Beijing, 100049, PR China
| | - Hao-Yi Cheng
- School of Civil & Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China.
| | - Hao Zhang
- Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China
| | - Shi-Gang Su
- Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China
| | - Yi-Lu Sun
- Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China
| | - Hong-Cheng Wang
- School of Civil & Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China
| | - Jing-Long Han
- School of Civil & Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China
| | - Ai-Jie Wang
- Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China; School of Civil & Environmental Engineering, Harbin Institute of Technology (Shenzhen), Shenzhen, 518055, PR China.
| | - Awoke Guadie
- Key Laboratory of Environmental Biotechnology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, PR China; Department of Biology, College of Natural Sciences, Arba Minch University, Arba Minch 21, Ethiopia
| |
Collapse
|
12
|
Guo J, Cong Q, Zhang J, Zhang L, Meng L, Liu M, Ma F. Nitrous oxide emission in a laboratory anoxic-oxic process at different influent pHs: Generation pathways and the composition and function of bacterial community. BIORESOURCE TECHNOLOGY 2021; 328:124844. [PMID: 33609882 DOI: 10.1016/j.biortech.2021.124844] [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: 01/05/2021] [Revised: 02/07/2021] [Accepted: 02/09/2021] [Indexed: 06/12/2023]
Abstract
This study focused on the nitrous oxide (N2O) generation from the biological nitrogen removal process under different pH levels. To explore a pH optimum, the online N2O emission and the bacterial composition and function in the anoxic-oxic process were investigated. The mean gaseous N2O emission accounted for 0.329%, 0.103%, 0.085%, and 0.793% of the influent total nitrogen at pH of 5, 6, 8, and 9, respectively. Incomplete oxidation in oxic tanks was the primary source of N2O, while N2O in the anoxic tank was mainly generated by nitrifier denitrification. No direct correlations were observed between N2O emission and potential nitrifiers and denitrifiers. The impacts of pH on N2O generation were more likely related to the response of bacterial enzymes and nitrogen compounds, rather than the feedback of bacterial community structure itself. Above all, an influent pH range of 6-8 is recommended for nitrogen removal and N2O mitigation in anoxic-oxic process.
Collapse
Affiliation(s)
- Jingbo Guo
- School of Civil and Architecture Engineering, Northeast Electric Power University, Jilin 132012, China.
| | - Qiwei Cong
- Weihai Water Group Co. LTD, Weihai 264200, China; School of Chemical Engineering, Northeast Electric Power University, Jilin 132012, China
| | - Jun Zhang
- Storage Center of Jilin Petrochemical Company, Jilin 132000, China
| | - Lanhe Zhang
- School of Chemical Engineering, Northeast Electric Power University, Jilin 132012, China
| | - Lingwei Meng
- School of Civil and Architecture Engineering, Northeast Electric Power University, Jilin 132012, China
| | - Mingwei Liu
- School of Civil and Architecture Engineering, Northeast Electric Power University, Jilin 132012, China
| | - Fang Ma
- State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China
| |
Collapse
|
13
|
Zhang C, Wang X, Wei L, Wang B, Chen S. Time-resolved characteristics and production pathways of simulated landfilling N 2O emission under different oxygen concentrations. ENVIRONMENT INTERNATIONAL 2021; 149:106396. [PMID: 33524669 DOI: 10.1016/j.envint.2021.106396] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/26/2020] [Revised: 11/24/2020] [Accepted: 01/09/2021] [Indexed: 06/12/2023]
Abstract
Nitrous oxide (N2O), an important greenhouse gas, is emitted from landfill reservoirs, especially in the working face, where nitrification and denitrification occur under different O2 concentrations. In order to explore the effects of O2 concentration on N2O emissions and production pathways, the production of N2O from simulated fresh waste landfilling under 0%, 5%, 10%, and 21% (vol/vol) O2 concentrations were examined, and 15N isotopes were used as tracers to determine the contributions of nitrification (NF), heterotrophic denitrification (HD), and nitrification-coupled denitrification (NCD) to N2O production over a 72-h incubation period. Equal amounts of total nitrogen consumption occurred for all studied O2 concentration and the simulated waste tended to release more N2O under 0% and 21% O2. Heterotrophic denitrification was the main source of N2O release at the studied oxygen concentrations, contributing 90.51%, 69.04%, 80.75%, and 57.51% of N2O under O2 concentrations of 0%, 5%, 10%, and 21%, respectively. Only denitrification was observed in the simulated fresh waste when the oxygen concentration of the bulk atmosphere was 0%. The nitrate reductase (nirS)-encoding denitrifiers in the simulated landfill were also studied and significant differences were observed in the richness and diversity of the denitrifying community at different taxonomic levels. It was determined that optimising the O2 content is a crucial factor in N2O production that may allow greenhouse gas emissions and N turnover during landfill aeration to be minimised.
Collapse
Affiliation(s)
- Chengliang Zhang
- Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China; Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Xiaojun Wang
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Lai Wei
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China
| | - Boguang Wang
- Institute for Environmental and Climate Research, Jinan University, Guangzhou 511443, China
| | - Shaohua Chen
- Key Laboratory of Urban Pollutant Conversion, Institute of Urban Environment, Chinese Academy of Sciences, Xiamen 361021, China.
| |
Collapse
|
14
|
Cheng Q, Liu Z, Huang Y, Li F, Nengzi L, Zhang J. Influence of temperature on COD Mn and Mn 2+ removal and microbial community structure in pilot-scale biofilter. BIORESOURCE TECHNOLOGY 2020; 316:123968. [PMID: 32781387 DOI: 10.1016/j.biortech.2020.123968] [Citation(s) in RCA: 16] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/20/2020] [Revised: 07/28/2020] [Accepted: 08/02/2020] [Indexed: 06/11/2023]
Abstract
Test water temperature (TWT) is a significant operational parameter in biofilter. In this study, a pilot-scale biofilter was established to investigate the removal efficiency of CODMn and Mn2+ and the microbial community structure at different TWT. When CODMn and Mn2+ in the influent were 6-8 and 0.9-1.2 mg/L, respectively, the removal rates were 22.61% and 94.28% at the low TWT, while 69.42% and 97.85% at the high TWT, respectively. Biological CODMn and Mn2+ removal followed the first-order reaction, and at the low and high TWT, the k value was 0.00704 and 0.0738 and 0.0313 and 0.113 min-1, respectively. Organic matter oxidizing bacteria (OMOB, Sphingopyxis, Sphingomonas, Amphiplicatus, Novosphingobium, Gemmatimonas, Chryseolinea and Sphingobium) and manganese oxidizing bacteria (MnOB, Hyphomicrobium, Pedomicrobium and Pseudomonas) were coexisted in 0-1.5 m of the biofilter bed at the low and high TWT, and the abundances were not the main factor affecting the removal efficiency, however the activity.
Collapse
Affiliation(s)
- Qingfeng Cheng
- College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, PR China.
| | - Zongyang Liu
- College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, PR China
| | - Yang Huang
- College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, PR China
| | - Fengjiao Li
- College of Resources and Environment, Chengdu University of Information Technology, Chengdu 610225, PR China
| | - Lichao Nengzi
- College of Resources and Environment, Xichang University, Xichang 615000, PR China
| | - Jie Zhang
- State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin 150090, PR China
| |
Collapse
|
15
|
Chen H, Du M, Wang D, Zhou Y, Zeng L, Yang X. Influence of chlortetracycline as an antibiotic residue on nitrous oxide emissions from wastewater treatment. BIORESOURCE TECHNOLOGY 2020; 313:123696. [PMID: 32570074 DOI: 10.1016/j.biortech.2020.123696] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/28/2020] [Revised: 06/10/2020] [Accepted: 06/13/2020] [Indexed: 06/11/2023]
Abstract
Strengthening the removal of antibiotics in wastewater treatment plants is a research focus, but whether antibiotics affect nitrous oxide (N2O) emissions from wastewater treatment remains to be determined. In this study, the effect of chlortetracycline (CTC) on N2O emissions in anaerobic/oxic/anoxic sequential batch reactors was investigated. Experimental results show that CTC promotes N2O emissions during biological nutrient removal. The addition of 0.1 mg/L CTC increased the N2O emission factor by 41.4% compared to the control. Mechanism exploration shows that CTC stimulates the release of extracellular polymeric substance (EPS) and binds to it, the generated EPS-CTC conjugates hinder or expand the mass transfer channel, which intensifies the electronic competition between oxidoreductases and the substrate competition between microorganisms, resulting in incomplete denitrification and nitrite accumulation, thereby increasing N2O emissions.
Collapse
Affiliation(s)
- Hongbo Chen
- College of Environment and Resources, Xiangtan University, Xiangtan 411105, China.
| | - Mingyang Du
- College of Environment and Resources, Xiangtan University, Xiangtan 411105, China
| | - Dongbo Wang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
| | - Yaoyu Zhou
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
| | - Long Zeng
- College of Environment and Resources, Xiangtan University, Xiangtan 411105, China
| | - Xiao Yang
- Key Laboratory of Land Surface Pattern and Simulation, Institute of Geographic Sciences and Natural Resources Research, Chinese Academy of Sciences, Beijing 100101, China
| |
Collapse
|
16
|
Chen H, Zeng L, Wang D, Zhou Y, Yang X. Exploring the linkage between free nitrous acid accumulation and nitrous oxide emissions in a novel static/oxic/anoxic process. BIORESOURCE TECHNOLOGY 2020; 304:123011. [PMID: 32088627 DOI: 10.1016/j.biortech.2020.123011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/24/2019] [Revised: 02/08/2020] [Accepted: 02/11/2020] [Indexed: 06/10/2023]
Abstract
In this work, four batch tests were conducted to comprehensively explore the effects of free nitrous acid (FNA) accumulation on nitrous oxide (N2O) emissions in a novel energy-saving and N2O-reducing static/oxic/anoxic (SOA) process. With the accumulation of FNA, the N2O emission factor increased from 1.51% to 4.32%, and the N2O emission ratio contributed by ammonia-oxidizing bacteria (AOB) increased from 74.0% to 78.6%, accordingly. Mechanism studies show that produced FNA and weakened aerobic metabolism bring synergy to competition between reductases. Aeration conditions and FNA cytotoxicity exert a greater impact on nitrite-oxidizing bacteria than on AOB, thus enhancing the potential for nitrite accumulation. Considering the removal of nitrogen and phosphorus and the reduction of N2O emissions in the SOA process, it is feasible to keep the average dissolved oxygen above 2.0 mg/L under the premise of nitrite accumulation.
Collapse
Affiliation(s)
- Hongbo Chen
- College of Environment and Resources, Xiangtan University, Xiangtan 411105, China
| | - Long Zeng
- College of Environment and Resources, Xiangtan University, Xiangtan 411105, China
| | - Dongbo Wang
- College of Environmental Science and Engineering, Hunan University, Changsha 410082, China
| | - Yaoyu Zhou
- Department of Civil and Environmental Engineering, The Hong Kong Polytechnic University, Hong Kong, China
| | - Xiao Yang
- Korea Biochar Research Center, O-Jeong Eco-Resilience Institute (OJERI) & Division of Environmental Science and Ecological Engineering, Korea University, Seoul 02841, Republic of Korea.
| |
Collapse
|
17
|
Tan X, Yang YL, Li X, Zhou ZW, Liu CJ, Liu YW, Yin WC, Fan XY. Intensified nitrogen removal by heterotrophic nitrification aerobic denitrification bacteria in two pilot-scale tidal flow constructed wetlands: Influence of influent C/N ratios and tidal strategies. BIORESOURCE TECHNOLOGY 2020; 302:122803. [PMID: 31981807 DOI: 10.1016/j.biortech.2020.122803] [Citation(s) in RCA: 59] [Impact Index Per Article: 14.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/29/2019] [Revised: 01/03/2020] [Accepted: 01/10/2020] [Indexed: 06/10/2023]
Abstract
This study investigated the influence of C/N ratios and tidal strategies on nitrogen removal and bacterial communities in two pilot-scale tidal flow constructed wetlands (TFCWs) with simultaneous nitrification-denitrification process. Heterotrophic nitrification aerobic denitrification (HNAD) was the main nitrogen transformation pathway in both TFCWs. High C/N ratios and effluent circulation at low temperature promoted HNAD in TFCWs with high nitrogen removal efficiencies (72.6%-95.5% for NH4+-N and 70.9%~91.8% for TN). Effluent circulation had more influence on bacterial community structure and diversity than C/N ratios. Among 16 detected genera related to nitrogen removal, HNAD bacteria (HNADB) were abundant. Especially, some dominant HNADB (e.g. Aeromonas, Hydrogenophage and Gemmobacter) were core genera, showing positive interactions with other genera related to nitrogen removal. Tidal strategies had more contribution to the shifts in these genera than C/N ratios. This study highlights the importance of HNADB in pilot-scale TFCWs and their responses to C/N ratios and tidal strategies.
Collapse
Affiliation(s)
- Xu Tan
- College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China
| | - Yan-Ling Yang
- College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China
| | - Xing Li
- College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China
| | - Zhi-Wei Zhou
- College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China
| | - Chang-Jian Liu
- College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China
| | - Yong-Wang Liu
- College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China; China Architecture Design and Research Group, Beijing 100044, China
| | - Wen-Chao Yin
- China Architecture Design and Research Group, Beijing 100044, China
| | - Xiao-Yan Fan
- College of Architecture and Civil Engineering, Beijing University of Technology, Beijing 100124, China.
| |
Collapse
|