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Wu G, Yang G, Sun X, Li B, Tian Z, Niu X, Cheng J, Feng L. Simultaneous denitrification and organics removal by denitrifying bacteria inoculum in a multistage biofilm process for treating desulfuration and denitration wastewater. BIORESOURCE TECHNOLOGY 2023; 388:129757. [PMID: 37714492 DOI: 10.1016/j.biortech.2023.129757] [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: 07/22/2023] [Revised: 09/04/2023] [Accepted: 09/07/2023] [Indexed: 09/17/2023]
Abstract
This study aimed to treat real wastewater from the desulfuration and denitration process in a petrochemical plant with high-strength nitrogen (TN≈200 mg/L, > 90% nitrate), sulfate (2.7%) and extremely low-strength organics (CODCr < 30 mg/L). Heterotrophic denitrification of multistage anoxic and oxic biofilm (MAOB) process in three tanks using facultative denitrifying bacteria inoculum was developed to simultaneously achieve desirable effluent nitrogen and organics at different hydraulic retention time (HRT) and carbon to nitrogen (C/N) mass ratios. The optimum condition was recommended as a C/N ratio of 1.5 and a HRT of A (24 h)/O (12-24 h) to achieve > 90% of nitrogen and organics removal as well as no significant variation of sulfate. The denitrifying biofilm in various tanks was dominant by Hyphomicrobium (8.9%-25.7%), Methylophaga (18.6%-25.8%) and Azoarcus (3.3%-19.6%), etc., containing > 20% aerobic denitrifiers. This explained that oxic zone in MAOB process also exhibited simultaneous nitrogen and organics removal.
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Affiliation(s)
- Guiyang Wu
- Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control, Zhejiang Ocean University, Zhoushan 316022, China
| | - Guangfeng Yang
- Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control, Zhejiang Ocean University, Zhoushan 316022, China; National-Local Joint Engineering Laboratory of Harbor Oil & Gas Storage and Transportation Technology, Zhoushan 316022, China
| | - Xiaoran Sun
- Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control, Zhejiang Ocean University, Zhoushan 316022, China
| | - Bu Li
- Sinopec Luoyang Petrochemical Engineering Corporation, Luoyang 471003, China
| | - Zhijuan Tian
- Sinopec Luoyang Petrochemical Engineering Corporation, Luoyang 471003, China
| | - Xinzheng Niu
- Sinopec Luoyang Petrochemical Engineering Corporation, Luoyang 471003, China
| | - Junmei Cheng
- Sinopec Luoyang Petrochemical Engineering Corporation, Luoyang 471003, China
| | - Lijuan Feng
- Zhejiang Key Laboratory of Petrochemical Environmental Pollution Control, Zhejiang Ocean University, Zhoushan 316022, China; National-Local Joint Engineering Laboratory of Harbor Oil & Gas Storage and Transportation Technology, Zhoushan 316022, China.
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2
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Su W, Wang X, Yang J, Yu Q, Li X, Zhang S, Li H. Multi-omics methods reveal that putrescine and cadaverine cause different degrees of enrichment of high-risk resistomes and opportunistic pathogens in the water and sediment of the Yellow River. ENVIRONMENTAL RESEARCH 2023; 219:115069. [PMID: 36549489 DOI: 10.1016/j.envres.2022.115069] [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: 10/22/2022] [Revised: 11/28/2022] [Accepted: 12/13/2022] [Indexed: 06/17/2023]
Abstract
Contamination of antibiotic resistomes due to animal carcass decay has become a serious environmental concern. However, the relationship between main metabolite compounds of corpse decomposition (i.e., putrescine and cadaverine) and antibiotic resistomes remains unclear. To tackle this issue, the response of antibiotic resistance genes (ARGs) and microbiome in aquatic environment to excess putrescine, cadaverine and a mixture of both based on laboratory simulation experiment was investigated by high-throughput quantitative PCR and amplicon sequencing methods. Our results showed putrescine and cadaverine led to the increasing of TC (total carbon) and TN (total nitrogen) both in water and sediment. Under the exposure of putrescine and cadaverine, the total abundance of mobile genetic elements (MGEs) and most ARGs in water was higher than in sediment. In particular, putrescine and cadaverine caused significantly different decreases in alpha diversity of microbial community in water and sediment compared with the control group. Microbial community structures both in water and sediment were also significantly affected by cadaverine and putrescine. Furthermore, putrescine and cadaverine led to different degrees of increases of high-risk ARGs (like mecA) and opportunistic pathogens (like Delftia) in sediment, promoting the prevalence of antibiotic resistant bacteria. In conclusion, our findings revealed the influences of main metabolites of carcass decay on microbiome and resistomes, providing references for risk assessment and pollution management.
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Affiliation(s)
- Wanghong Su
- School of Public Health, Lanzhou University, Lanzhou, 730000, China
| | - Xiaocheng Wang
- School of Public Health, Lanzhou University, Lanzhou, 730000, China
| | - Jiawei Yang
- School of Public Health, Lanzhou University, Lanzhou, 730000, China
| | - Qiaoling Yu
- School of Public Health, Lanzhou University, Lanzhou, 730000, China
| | - Xiaoshan Li
- Chongqing Key Laboratory of Development and Utilization of Genuine Medicinal Materials in Three Gorges Reservoir Area, Faculty of Basic Medical Sciences, Chongqing Three Gorges Medical College, Wanzhou 404120, China
| | - Shiheng Zhang
- Chongqing Key Laboratory of Development and Utilization of Genuine Medicinal Materials in Three Gorges Reservoir Area, Faculty of Basic Medical Sciences, Chongqing Three Gorges Medical College, Wanzhou 404120, China.
| | - Huan Li
- School of Public Health, Lanzhou University, Lanzhou, 730000, China; State Key Laboratory of Grassland Agro-ecosystems, Center for Grassland Microbiome, College of Pastoral Agriculture Science and Technology, Lanzhou University, Gansu, 730000, China.
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3
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Puigserver D, Herrero J, Carmona JM. Nitrate removal by combining chemical and biostimulation approaches using micro-zero valent iron and lactic acid. THE SCIENCE OF THE TOTAL ENVIRONMENT 2022; 843:156841. [PMID: 35750160 DOI: 10.1016/j.scitotenv.2022.156841] [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: 03/10/2022] [Revised: 06/07/2022] [Accepted: 06/16/2022] [Indexed: 06/15/2023]
Abstract
The occurrence of nitrate is the most significant type of pollution affecting groundwater globally, being a major contributor to the poor condition of water bodies. This pollution is related to livestock-agricultural and urban activities, and the nitrate presence in drinking water has a clear impact on human health. For example, it causes the blue child syndrome. Moreover, the high nitrate content in aquifers and surface waters significantly affects aquatic ecosystems since it is responsible for the eutrophication of surface water bodies. A treatability test was performed in the laboratory to study the decrease of nitrate in the capture zone of water supply wells. For this purpose, two boreholes were drilled from which groundwater and sediments were collected to conduct the test. The goal was to demonstrate that nitrate in groundwater can be decreased much more efficiently using combined abiotic and biotic methods with micro-zero valent iron and biostimulation with lactic acid, respectively, than when both strategies are used separately. The broader implications of this goal derive from the fact that the separate use of these reagents decreases the efficiency of nitrate removal. Thus, while nitrate is removed using micro-valent iron, high concentrations of harmful ammonium are also generated. Furthermore, biostimulation alone leads to overgrowth of other microorganisms that do not result in denitrification, therefore complete denitrification requires more time to occur. In contrast, the combined strategy couples abiotic denitrification of nitrate with biostimulation of microorganisms capable of biotically transforming the abiotically generated harmful ammonium. The treatability test shows that the remediation strategy combining in situ chemical reduction using micro-zero valent iron and biostimulation with lactic acid could be a viable strategy for the creation of a reactive zone around supply wells located in regions where groundwater and porewater in low permeability layers are affected by diffuse nitrate contamination.
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Affiliation(s)
- Diana Puigserver
- Department of Mineralogy, Petrology and Applied Geology, Faculty of Earth Sciences, University of Barcelona (UB), Water Research Institute (IdRA-UB), C/ Martí i Franquès, s/n, E-08028 Barcelona, Spain.
| | - Jofre Herrero
- Department of Mineralogy, Petrology and Applied Geology, Faculty of Earth Sciences, University of Barcelona (UB), Water Research Institute (IdRA-UB), C/ Martí i Franquès, s/n, E-08028 Barcelona, Spain.
| | - José M Carmona
- Department of Mineralogy, Petrology and Applied Geology, Faculty of Earth Sciences, University of Barcelona (UB), Water Research Institute (IdRA-UB), C/ Martí i Franquès, s/n, E-08028 Barcelona, Spain.
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Wang Z, Feng K, Wei Z, Wu Y, Isobe K, Senoo K, Peng X, Wang D, He Q, Du X, Li S, Li Y, Deng Y. Evaluation and redesign of the primers for detecting nitrogen cycling genes in environments. Methods Ecol Evol 2022. [DOI: 10.1111/2041-210x.13946] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/05/2023]
Affiliation(s)
- Zhujun Wang
- CAS Key Laboratory for Environmental Biotechnology, Research Center for Eco‐Environmental Sciences Chinese Academy of Sciences (CAS) Beijing China
- College of Resources and Environment University of Chinese Academy of Sciences Beijing China
- College of Tropical Crops Hainan University Haikou China
| | - Kai Feng
- CAS Key Laboratory for Environmental Biotechnology, Research Center for Eco‐Environmental Sciences Chinese Academy of Sciences (CAS) Beijing China
| | - Ziyan Wei
- State Key Laboratory of Microbial Resources, Institute of Microbiology Chinese Academy of Sciences Beijing China
| | - Yueni Wu
- CAS Key Laboratory for Environmental Biotechnology, Research Center for Eco‐Environmental Sciences Chinese Academy of Sciences (CAS) Beijing China
- College of Resources and Environment University of Chinese Academy of Sciences Beijing China
| | - Kazuo Isobe
- Institute of Ecology, College of Urban and Environmental Sciences Peking University Beijing China
| | - Keishi Senoo
- Department of Applied Biological Chemistry, Graduate School of Agricultural and Life Sciences The University of Tokyo Tokyo Japan
- Collaborative Research Institute for Innovative Microbiology The University of Tokyo Tokyo Japan
| | - Xi Peng
- CAS Key Laboratory for Environmental Biotechnology, Research Center for Eco‐Environmental Sciences Chinese Academy of Sciences (CAS) Beijing China
- College of Resources and Environment University of Chinese Academy of Sciences Beijing China
| | - Danrui Wang
- CAS Key Laboratory for Environmental Biotechnology, Research Center for Eco‐Environmental Sciences Chinese Academy of Sciences (CAS) Beijing China
- College of Resources and Environment University of Chinese Academy of Sciences Beijing China
| | - Qing He
- CAS Key Laboratory for Environmental Biotechnology, Research Center for Eco‐Environmental Sciences Chinese Academy of Sciences (CAS) Beijing China
- College of Resources and Environment University of Chinese Academy of Sciences Beijing China
| | - Xiongfeng Du
- CAS Key Laboratory for Environmental Biotechnology, Research Center for Eco‐Environmental Sciences Chinese Academy of Sciences (CAS) Beijing China
- College of Resources and Environment University of Chinese Academy of Sciences Beijing China
| | - Shuzhen Li
- CAS Key Laboratory for Environmental Biotechnology, Research Center for Eco‐Environmental Sciences Chinese Academy of Sciences (CAS) Beijing China
- Key Laboratory of Industrial Ecology and Environmental Engineering (Ministry of Education), School of Environmental Science and Technology Dalian University of Technology Dalian China
| | - Yan Li
- State Key Laboratory of Oral Diseases, National Clinical Research Center for Oral Diseases West China Hospital of Stomatology, Sichuan University Chengdu China
| | - Ye Deng
- CAS Key Laboratory for Environmental Biotechnology, Research Center for Eco‐Environmental Sciences Chinese Academy of Sciences (CAS) Beijing China
- College of Resources and Environment University of Chinese Academy of Sciences Beijing China
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Su W, Wang S, Yang J, Yu Q, Wirth S, Huang X, Qi W, Zhang X, Li H. Corpse decay of wild animals leads to the divergent succession of nrfA-type microbial communities. Appl Microbiol Biotechnol 2022; 106:5287-5300. [PMID: 35802158 DOI: 10.1007/s00253-022-12065-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/23/2022] [Revised: 06/27/2022] [Accepted: 07/02/2022] [Indexed: 11/29/2022]
Abstract
Animal carcasses introduce large amounts of nitrates and ammonium into the soil ecosystem. Some of this ammonium is transformed from nitrite through the nrfA-type microbial community. However, it is unclear how nrfA-type microorganisms respond to the decomposition of corpses. This study applied high-throughput sequencing to characterize the ecological succession of nrfA-type microbial communities in grassland soil. Our results showed that Cyclobacterium and Trueperella were the predominant genera for nrfA-type communities in soil with a decomposing corpse (experimental group), while Cyclobacterium and Archangium were dominant in soil without a corpse (control group). The alpha diversity indexes and the resistance and resilience indexes of the microbial communities initially increased and then decreased during decomposition. Compared with the control group, nrfA-encoding community structure in the experimental group gradually became divergent with succession and temporal turnover accelerated. Network analysis revealed that the microbial communities of the experimental group had more complex interactions than those of the control groups. Moreover, the bacterial community assembly in the experimental group was governed by stochastic processes, and the communities of the experimental group had a weaker dispersal capacity than those of the control group. Our results reveal the succession patterns of the nrfA-type microbial communities during degradation of wild animal corpses, which can offer references for demonstrating the ecological mechanism underlying the changes in the nrfA-type microbial community during carcass decay. KEY POINTS: • Corpse decay accelerates the temporal turnover of the nrfA-type community in soil. • Corpse decay changes the ecological succession of the nrfA-type community in soil. • Corpse decay leads to a complex co-occurrence pattern of the nrfA-type community in soil.
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Affiliation(s)
- Wanghong Su
- School of Public Health, Lanzhou University, Lanzhou, 730000, China
| | - Sijie Wang
- School of Public Health, Lanzhou University, Lanzhou, 730000, China
| | - Jiawei Yang
- School of Public Health, Lanzhou University, Lanzhou, 730000, China
| | - Qiaoling Yu
- School of Public Health, Lanzhou University, Lanzhou, 730000, China
| | - Stephan Wirth
- Leibniz-Centre for Agricultural Landscape Research (ZALF), Institute of Landscape Biogeochemistry, Eberswalder Str. 84, 15374, Muncheberg, Germany
| | - Xiaodan Huang
- School of Public Health, Lanzhou University, Lanzhou, 730000, China
| | - Wanpeng Qi
- Genesky Biotechnologies Inc., Shanghai, 201315, China
| | - Xiao Zhang
- Key Laboratory of National Forestry and Grassland Administration On Silviculture in Loess Plateau, College of Forestry, Northwest A&F University, Yangling, 712100, China.
| | - Huan Li
- School of Public Health, Lanzhou University, Lanzhou, 730000, China. .,State Key Laboratory of Grassland Agro-ecosystems, Center for Grassland Microbiome, College of pastoral agriculture science and technology, Lanzhou University, Gansu, 730000, China.
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Zhang M, Daraz U, Sun Q, Chen P, Wei X. Denitrifier abundance and community composition linked to denitrification potential in river sediments. ENVIRONMENTAL SCIENCE AND POLLUTION RESEARCH INTERNATIONAL 2021; 28:51928-51939. [PMID: 33990922 DOI: 10.1007/s11356-021-14348-w] [Citation(s) in RCA: 8] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/10/2020] [Accepted: 05/06/2021] [Indexed: 06/12/2023]
Abstract
Denitrification in river sediments plays a very important role in removing nitrogen in aquatic ecosystem. To gain insight into the key factors driving denitrification at large spatial scales, a total of 135 sediment samples were collected from Huaihe River and its branches located in the northern of Anhui province. Bacterial community composition and denitrifying functional genes (nirS, nirK, and nosZ) were measured by high-throughput sequencing and real-time PCR approaches. Potential denitrification rate (PDR) was measured by acetylene inhibition method, which varied from 0.01 to 15.69 μg N g-1 h-1. The sequencing results based on 16S rRNA gene found that the main denitrification bacterial taxa included Bacillus, Thiobacillus, Acinetobacter, Halomonas, Denitratisoma, Pseudomonas, Rhodanobacter, and Thauera. Therein, Thiobacillus might play key roles in the denitrification. Total nitrogen and N:P ratio were the only chemical factors related with all denitrification genes. Furthermore, nirS gene abundance could be more susceptible to environmental parameters compared with nirK and nosZ genes. Canonical correspondence analysis indicated that NO3-, NO2-, NH4+ and IP had the significant impacts on the nirS-encoding bacterial community and spatial distributions. There was a significantly positive correlation between Thiobacillus and nirS gene. We considered that higher numbers of nosZ appeared in nutrient rich sediments. More strikingly, PDR was positively correlated with the abundance of three functional genes. Random forest analysis showed that NH4+ was the most powerful predictor of PDR. These findings can yield practical and important reference for the bioremediation or evaluation of wetland systems.
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Affiliation(s)
- Mingzhu Zhang
- School of Resources and Environmental Engineering, Anhui University, Hefei, 230601, Anhui Province, China
- Key Laboratory of Wetland Ecological Protection and Restoration, Hefei, China
- Anhui Province Engineering Laboratory for Mine Ecological Remediation, Hefei, China
| | - Umar Daraz
- School of Resources and Environmental Engineering, Anhui University, Hefei, 230601, Anhui Province, China
| | - Qingye Sun
- School of Resources and Environmental Engineering, Anhui University, Hefei, 230601, Anhui Province, China.
- Key Laboratory of Wetland Ecological Protection and Restoration, Hefei, China.
- Anhui Province Engineering Laboratory for Mine Ecological Remediation, Hefei, China.
| | - Piaoxue Chen
- School of Resources and Environmental Engineering, Anhui University, Hefei, 230601, Anhui Province, China
- Key Laboratory of Wetland Ecological Protection and Restoration, Hefei, China
- Anhui Province Engineering Laboratory for Mine Ecological Remediation, Hefei, China
| | - Xuhao Wei
- School of Resources and Environmental Engineering, Anhui University, Hefei, 230601, Anhui Province, China
- Key Laboratory of Wetland Ecological Protection and Restoration, Hefei, China
- Anhui Province Engineering Laboratory for Mine Ecological Remediation, Hefei, China
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Yu Q, Zhou R, Wang Y, Su W, Yang J, Feng T, Dou Y, Li H. Carcass decay deteriorates water quality and modifies the nirS denitrifying communities in different degradation stages. THE SCIENCE OF THE TOTAL ENVIRONMENT 2021; 785:147185. [PMID: 33933763 DOI: 10.1016/j.scitotenv.2021.147185] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/09/2021] [Revised: 03/19/2021] [Accepted: 04/12/2021] [Indexed: 06/12/2023]
Abstract
Corpse degradation may release amounts of hazardous materials (e.g., cadaverine, putrescine and ammonia) into surrounding areas, which deteriorate environments and result in nitrogen contamination. Nitrate or nitrite can be reduced to nitrogen gas by denitrifying bacteria, thus alleviating nitrogen contamination and purifying aquatic environments. However, the reaction of nirS-encoding denitrifiers to carcass degradation is less studied. Therefore, water physiochemical analysis and high-throughput sequencing were applied to explore the successional pattern of nirS denitrifying communities in the Yellow River water and tap water during three stages of animal cadaver decay (submerged fresh, advanced floating decay as well as sunken remains) and relevant control group. Nitrate nitrogen (NO3-N) and ammonia nitrogen (NH4+-N) concentration in corpse groups were highly elevated compared with control groups. The dominant phylum for nirS denitrifying communities was Proteobacteria. Abundant denitrifying genera Paracoccus, Alicycliphilus and Diaphorobacter were detected, and these genera have been reported to participate in the degradation of organic pollutants. Particularly, nirS-type community structures were remarkably influenced by corpse decay and became similar with succession. Water total dissolved solids (TDS), salinity, conductivity (CON) and phosphate were primary impacting factors driving the community structures, but the effect of water type was almost negligible. Notably, denitrifying community assembly was dominated by deterministic processes rather than stochastic processes, and the relative importance of deterministic processes among most corpse groups was higher than that in control groups, indicating that environmental filtering regulates the denitrifying communities. Our results provide new insight into environmental purification for hazardous materials produced by corpse degradation, thereby providing valuable advice to environmental administration.
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Affiliation(s)
- Qiaoling Yu
- School of Public Health, Lanzhou University, Lanzhou 730000, China
| | - Rui Zhou
- School of Public Health, Lanzhou University, Lanzhou 730000, China
| | - Yijie Wang
- School of Public Health, Lanzhou University, Lanzhou 730000, China
| | - Wanghong Su
- School of Public Health, Lanzhou University, Lanzhou 730000, China
| | - Jiawei Yang
- School of Public Health, Lanzhou University, Lanzhou 730000, China
| | - Tianshu Feng
- School of Public Health, Lanzhou University, Lanzhou 730000, China
| | - Yaqi Dou
- Hubei Aquaculture Technology Extension Center (Hubei Aquatic Breeds Introduction and Breeding Center), Wuhan 430070, China
| | - Huan Li
- School of Public Health, Lanzhou University, Lanzhou 730000, China; Center for Grassland Microbiome, Lanzhou University, Lanzhou 730000, China..
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Community Composition and Spatial Distribution of N-Removing Microorganisms Optimized by Fe-Modified Biochar in a Constructed Wetland. INTERNATIONAL JOURNAL OF ENVIRONMENTAL RESEARCH AND PUBLIC HEALTH 2021; 18:ijerph18062938. [PMID: 33805608 PMCID: PMC8000742 DOI: 10.3390/ijerph18062938] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Subscribe] [Scholar Register] [Received: 01/08/2021] [Revised: 03/07/2021] [Accepted: 03/09/2021] [Indexed: 11/17/2022]
Abstract
Microbial nitrogen (N) removal capability can be significantly enhanced in a horizontal subsurface flow constructed wetland (HSCW) amended by Fe-modified biochar (FeB). To further explore the microbiological mechanism of FeB enhancing N removal, nirS- and nirK-denitrifier community diversities, as well as spatial distributions of denitrifiers and anaerobic ammonium oxidation (anammox) bacteria, were investigated in HSCWs (C-HSCW: without biochar and FeB; B-HSCW: amended by biochar; FeB-HSCW: amended by FeB) treating tailwater from a wastewater treatment plant, with C-HSCW without biochar and FeB and B-HSCW amended by biochar as control. The community structures of nirS- and nirK-denitrifiers in FeB-HSCW were significantly optimized for improved N removal compared with the two other HSCWs, although no significant differences in their richness and diversity were detected among the HSCWs. The spatial distributions of the relative abundance of genes involved in denitrification and anammox were more heterogeneous and complex in FeB-HSCW than those in other HSCWs. More and larger high-value patches were observed in FeB-HSCW. These revealed that FeB provides more appropriate habitats for N-removing microorganisms, which can prompt the bacteria to use the habitats more differentially, without competitive exclusion. Overall, the Fe-modified biochar enhancement of the microbial N-removal capability of HSCWs was a result of optimized microbial community structures, higher functional gene abundance, and improved spatial distribution of N-removing microorganisms.
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Yu Q, Zhou R, Wang Y, Feng T, Li H. Corpse decomposition increases nitrogen pollution and alters the succession of nirK-type denitrifying communities in different water types. THE SCIENCE OF THE TOTAL ENVIRONMENT 2020; 747:141472. [PMID: 32795804 DOI: 10.1016/j.scitotenv.2020.141472] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/14/2020] [Revised: 08/02/2020] [Accepted: 08/02/2020] [Indexed: 06/11/2023]
Abstract
Cadaver decomposition as high-quality nutrient inputs may exert strong perturbation on the aquatic environments, such as high nitrogen or nitrate pollution. Denitrifying bacteria may reduce nitrate to nitrogen gas, thereby decreasing the nitrogen pollution and improving self-purification ability of aquatic ecosystem. However, how nirK denitrifying communities in water respond to cadaver decomposition remains unknown. Thus, we employed high-throughput sequencing and chemical analysis to investigate the succession of nirK-type denitrifying communities in tap water and Yellow river water (experimental groups) as well as their corresponding control groups during two important stages of fish corpse decomposition called advanced floating decay and sunken remains. Our data showed that the concentration of NH4+-N in the experimental groups increased approximately 3-4 times compared with the control groups. Proteobacteria was the predominant phylum for nirK denitrifying communities. Several potential pathogenic genera, such as Brucella and Achromobacter, were enriched in the corpse groups. Notably, nirK-type community structures were significantly impacted by cadaver decomposition. Community structures in the corpse groups become more similar with succession, indicating community convergence at the final stage. Water pH, oxidation-reduction potential (ORP) and treatment were three important factors affecting the community structures. However, water type was not a main driving factor determining carcass-associated nirK-type bacterial communities. Four phylogenetic clusters were detected in the denitrifying communities, but showed significantly different distribution between the corpse and control groups. These results provide an in-depth understanding for nirK denitrifying functional bacteria and potential pathogenic bacteria during carrion decomposition process, which offer valuable reference to environmental evaluation and management.
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Affiliation(s)
- Qiaoling Yu
- School of Public Health, Lanzhou University, Lanzhou 730000, China
| | - Rui Zhou
- School of Public Health, Lanzhou University, Lanzhou 730000, China
| | - Yijie Wang
- School of Public Health, Lanzhou University, Lanzhou 730000, China
| | - Tianshu Feng
- School of Public Health, Lanzhou University, Lanzhou 730000, China
| | - Huan Li
- School of Public Health, Lanzhou University, Lanzhou 730000, China; Center for Grassland Microbiome, Lanzhou University, Lanzhou 730000, China.
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Chen Q, Fan J, Ming H, Su J, Wang Y, Wang B. Effects of environmental factors on denitrifying bacteria and functional genes in sediments of Bohai Sea, China. MARINE POLLUTION BULLETIN 2020; 160:111621. [PMID: 32919123 DOI: 10.1016/j.marpolbul.2020.111621] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/27/2019] [Revised: 08/24/2020] [Accepted: 08/25/2020] [Indexed: 06/11/2023]
Abstract
The ability of denitrifying microorganisms to respond to different ecological pressures remains unknown, especially in marine sediments rich in various heavy metals. Here, gene abundance and transcriptional abundance of five functional denitrification genes (narG, nirK, nirS, norB, and nosZ) in Bohai Sea sediments were examined, and high-throughput Illumina sequencing was used to analyze the community structure of nirK and nirS denitrifying bacteria. The nirS- and nirK-type denitrifying bacteria were classified into different genera. The heavy metal content in sediments was negatively correlated with transcriptional abundance of denitrifying genes, and RNA: DNA ratio for each gene was highest in central Bohai Sea. These results indicated the distribution of nitrite reductase denitrifying bacterial communities was affected by depth, total nitrogen, total phosphorus and sediment grain size. Heavy metal contamination in sediment environment may negatively regulate the transcriptional abundance of denitrifying genes and cause geographical differences in the denitrifying bacterial community structure.
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Affiliation(s)
- Quanrui Chen
- National Marine Environmental Monitoring Center, Dalian 116023, China; Xiamen University, Xiamen 361000, China
| | - Jingfeng Fan
- National Marine Environmental Monitoring Center, Dalian 116023, China.
| | - Hongxia Ming
- National Marine Environmental Monitoring Center, Dalian 116023, China
| | - Jie Su
- National Marine Environmental Monitoring Center, Dalian 116023, China
| | - Yantao Wang
- National Marine Environmental Monitoring Center, Dalian 116023, China; Dalian Ocean University, Dalian 116000, China
| | - Bin Wang
- Dalian Ocean University, Dalian 116000, China
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11
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Yang Y, Kumar Awasthi M, Wu L, Yan Y, Lv J. Microbial driving mechanism of biochar and bean dregs on NH 3 and N 2O emissions during composting. BIORESOURCE TECHNOLOGY 2020; 315:123829. [PMID: 32682258 DOI: 10.1016/j.biortech.2020.123829] [Citation(s) in RCA: 45] [Impact Index Per Article: 11.3] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2020] [Revised: 07/05/2020] [Accepted: 07/08/2020] [Indexed: 06/11/2023]
Abstract
In this study, the effect of biochar (BC) and bean dregs (BD) on nitrifiers and denitrifiers as well as the contributions to the NH3 and N2O emissions were investigated. Compared with the BD treatment, the maximum value of NH3 and N2O emission was decreased by 32.92% and 46.61% in the BD + BC treatment, respectively. The production of NH3 and N2O was closely associated with the abundance and structure of nitrogen functional genes. BD + BC increased the abundance of AOB amoA gene to decrease the NH3 emission. The abundance of nirS was more closely associated with N2O. The abundance of nirS in the BD + BC was lowered by 18.93% compared with the BD treatment, thereby decreasing the N2O emission after composting. Besides, the nosZ-type gene was the more functional denitrification bacterial communities to effect the N2O emissions.
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Affiliation(s)
- Yajun Yang
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, PR China
| | - Mukesh Kumar Awasthi
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China
| | - Lulu Wu
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, PR China
| | - Ying Yan
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, PR China
| | - Jialong Lv
- College of Natural Resources and Environment, Northwest A&F University, Yangling, Shaanxi Province 712100, PR China; Key Laboratory of Plant Nutrition and the Agri-environment in Northwest China, Ministry of Agriculture, PR China.
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12
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Shilei Z, Yue S, Tinglin H, Ya C, Xiao Y, Zizhen Z, Yang L, Zaixing L, Jiansheng C, Xiao L. Reservoir water stratification and mixing affects microbial community structure and functional community composition in a stratified drinking reservoir. JOURNAL OF ENVIRONMENTAL MANAGEMENT 2020; 267:110456. [PMID: 32421660 DOI: 10.1016/j.jenvman.2020.110456] [Citation(s) in RCA: 15] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/30/2019] [Revised: 03/02/2020] [Accepted: 03/16/2020] [Indexed: 06/11/2023]
Abstract
To investigate how the aquatic bacterial community of a stratified reservoir drives the evolution of water parameters, the microbial community structure and network characteristics of bacteria in a stratified reservoir were investigated using Illumina MiSeq sequencing technology. A total of 42 phyla and 689 distinct genera were identified, which showed significant seasonal variation. Additionally, stratified variations in the bacterial community strongly reflected the vertical gradient and seasonal changes in water temperature, dissolved oxygen, and nutrition concentration. Furthermore, principal coordinate analysis indicated that most microorganisms were likely influenced by changes in water stratification conditions, exhibiting significant differences during the stratification period and mixing period based on Adonis, MRPP, and Anosim. Compared to the stratification period, 123 enhanced operational taxonomic units (OTUs; 29%) and 226 depleted OTUs (52%) were identified during the mixing period. Linear discriminant analysis effect size results showed that 15 major genera were enriched in the mixing period and 10 major genera were enriched in the stratification period. Importantly, network analysis revealed that the keystone species belonged to hgcI_clade, CL500-29, Acidibacter, Paucimonas, Flavobacterium, Prochlorothrix, Xanthomonadales, Chloroflexia, Burkholderiales, OPB56, KI89A_clade, Synechococcus, Caulobacter or were unclassified. Redundancy analysis showed that temperature, dissolved oxygen, pH, chlorophyll-α, total phosphorus, nitrate, and ammonia were important factors influencing the water bacterial community and function composition, which were consistent with the results of the Mantel test analysis. Furthermore, random forest analysis showed that temperature, dissolved oxygen, ammonia, and total dissolved phosphorous were the most important variables predicting water bacterial community and function community α- and β-diversity (P < 0.05). Overall, these results provide insight into the interactions between the microbial community and water quality evolution mechanism in Zhoucun reservoir.
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Affiliation(s)
- Zhou Shilei
- Pollution Prevention Biotechnology Laboratory of Hebei Province, School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, 050018, PR China; Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, PR China
| | - Sun Yue
- Pollution Prevention Biotechnology Laboratory of Hebei Province, School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, 050018, PR China
| | - Huang Tinglin
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, PR China.
| | - Cheng Ya
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, PR China
| | - Yang Xiao
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, PR China; Northwest Engineering Corporation Limited the Power Construction Corporation of China, PR China
| | - Zhou Zizhen
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, PR China; School of Energy and Environment, Zhongyuan University of Technology, Zhengzhou, 450007, PR China
| | - Li Yang
- Key Laboratory of Northwest Water Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, PR China; School of Energy and Environment, Zhongyuan University of Technology, Zhengzhou, 450007, PR China
| | - Li Zaixing
- Pollution Prevention Biotechnology Laboratory of Hebei Province, School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, 050018, PR China
| | - Cui Jiansheng
- Pollution Prevention Biotechnology Laboratory of Hebei Province, School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, 050018, PR China
| | - Luo Xiao
- Pollution Prevention Biotechnology Laboratory of Hebei Province, School of Environmental Science and Engineering, Hebei University of Science and Technology, Shijiazhuang, 050018, PR China
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13
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Linking Shifts in Bacterial Community Composition and Function with Changes in the Dissolved Organic Matter Pool in Ice-Covered Baiyangdian Lake, Northern China. Microorganisms 2020; 8:microorganisms8060883. [PMID: 32545218 PMCID: PMC7357102 DOI: 10.3390/microorganisms8060883] [Citation(s) in RCA: 10] [Impact Index Per Article: 2.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 05/12/2020] [Revised: 06/03/2020] [Accepted: 06/09/2020] [Indexed: 02/06/2023] Open
Abstract
The relationship between CDOM (Chromophoric dissolved organic matter) and the bacterial community was investigated in ice-covered Baiyangdian Lake. The results showed that environmental parameters significantly differed in Baiyangdian Lake, whereas a-diversity was not significantly different. Moreover, the microbial and functional communities exhibited significant differences, and T (Temperature), pH, ORP (Oxidation-reduction potential), DO (Dissolved oxygen), NO3−-N, NH4+-N, and Mn (Manganese) were the main environmental factors of these differences, based on redundancy analysis and the Mantel test. Biomarkers of the microbial and functional communities were investigated through linear discriminant analysis effect size and STAMP analysis. The number of biomarkers in the natural area was highest among the typical zones, and most top functions were related to carbohydrate metabolism. Two protein-like components (C1 and C2) and one humic-like component (C3) were identified by parallel factor analysis, and C1 was positively related to C2 (R = 0.99, p < 0.001), indicating the same sources. Moreover, CDOM significantly differed among the typical zones (p < 0.001). The high biological index, fluorescence index, β:α, and low humification index indicated a strong autochthonous component and aquatic bacterial origin, which was consistent with the results of UV-vis absorption spectroscopy. Network analysis revealed non-random co-occurrence patterns. The bacterial and functional communities interacted closely with CDOM. The dominant genera were CL500-29_marine_group, Flavobacterium, Limnohabitans, and Candidatus_Aquirestis. Random forest analysis showed that C1, C2, and C3 are important predictors of α- and β-diversity in the water bacterial community and its functional composition. This study provides insight into the interaction between bacterial communities and DOM (Dissolved organic matter) in ice-covered Baiyangdian Lake.
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14
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Li R, Wu S, Chai M, Xie S. Denitrifier communities differ in mangrove wetlands across China. MARINE POLLUTION BULLETIN 2020; 155:111160. [PMID: 32469777 DOI: 10.1016/j.marpolbul.2020.111160] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/07/2020] [Revised: 04/04/2020] [Accepted: 04/06/2020] [Indexed: 06/11/2023]
Abstract
To explore the geographical variations in the nosZ-denitrifier community and the underlying influential factors, surface sediments were collected from six mangroves across China, including Yunxiao (YX), Futian (FT), Fangchenggang (FCG), Zhanjiang (ZJ), Dongzhaigang (DZG), and Dongfang (DF). The nosZ gene abundance in mangrove sediments were 1.60 × 105-1.17 × 106 copies g-1 dry sediment, with a higher density in Avicennia marina forest than the mudflat. Denitrifier community richness and diversity increased with decreasing latitude based on the Chao1 richness and Shannon diversity index, with the highest diversity being observed in the DF mangrove. The denitrifier communities could be classified into three groups including south DF mangrove, middle FCG, ZJ and DZG mangroves, and north YX and FT mangroves based on HCA and PCoA analysis. The nosZ OTUs could be divided into seven distinct clusters with different proportionality characteristics among mangroves. Environmental factors (TN, TOC, and salinity) collectively shape denitrifier communities in mangrove sediments.
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Affiliation(s)
- Ruili Li
- Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, Guangdong, PR China
| | - Sijie Wu
- Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, Guangdong, PR China
| | - Minwei Chai
- Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, Guangdong, PR China
| | - Shuguang Xie
- Key Laboratory for Heavy Metal Pollution Control and Reutilization, School of Environment and Energy, Peking University Shenzhen Graduate School, Shenzhen 518055, Guangdong, PR China.
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15
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Xie H, Hong Y, Liu H, Jiao L, Wu J, Wang L. Spatio-temporal shifts in community structure and activity of nirS-type denitrifiers in the sediment cores of Pearl River Estuary. PLoS One 2020; 15:e0231271. [PMID: 32315323 PMCID: PMC7173864 DOI: 10.1371/journal.pone.0231271] [Citation(s) in RCA: 11] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/19/2020] [Accepted: 03/19/2020] [Indexed: 12/04/2022] Open
Abstract
Denitrification, an important process in microbial mediated nitrogen cycle, plays important roles in nitrogen loss in estuarine sediments. However, the function of denitrifiers in the estuarine subsurface sediments remained poorly understood. In this study, we analyzed the potential activity, abundance and community structure of nirS-type denitrifiers using 15N-labeled incubation quantitative-PCR and high throughput sequencing techniques in sediment cores from Pearl River Estuary (PRE). Results showed that subsurface sediments had nearly same level denitrification potential activity compare to surface sediments, although the abundance of nirS gene decreased sharply from surface to bottom in sediment cores. Meanwhile, nirS gene abundance exhibit significant temporal variations, which is consistent with denitrification potential activity. Moreover, the community structure and diversity of nirS-type denitrifiers in sediment cores exhibited remarkable temporal shift pattern. For spatial variation, no significant difference was observed of denitrifiers community structure in each sediment core from the surface to the subsurface, while there were significant different diversity characteristic among different cores. Redundancy analysis (RDA) showed that multiple environmental factors including salinity, pH, oxidation-reduction potential, nutrient content and organic substances synergistically shaped the diversity and distribution of nirS-type denitrifers in PRE sediments. Our results showed that nirS-type denitrifers played important roles in the nitrogen removal in subsurface sediments of PRE.
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Affiliation(s)
- Haitao Xie
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Institute of Environmental Research at Greater Bay, Guangzhou University, Guangzhou, China
- The School of Ecology and Environment, Inner Mongolia University, Hohhot, China
| | - Yiguo Hong
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Institute of Environmental Research at Greater Bay, Guangzhou University, Guangzhou, China
- * E-mail: (YH); (HL)
| | - Huamin Liu
- The School of Ecology and Environment, Inner Mongolia University, Hohhot, China
- * E-mail: (YH); (HL)
| | - Lijing Jiao
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Institute of Environmental Research at Greater Bay, Guangzhou University, Guangzhou, China
| | - Jiapeng Wu
- Key Laboratory for Water Quality and Conservation of the Pearl River Delta, Ministry of Education, Institute of Environmental Research at Greater Bay, Guangzhou University, Guangzhou, China
| | - Lixin Wang
- The School of Ecology and Environment, Inner Mongolia University, Hohhot, China
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16
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Jiang X, Liu W, Yao L, Liu G, Yang Y. The roles of environmental variation and spatial distance in explaining diversity and biogeography of soil denitrifying communities in remote Tibetan wetlands. FEMS Microbiol Ecol 2020; 96:5818761. [PMID: 32275304 DOI: 10.1093/femsec/fiaa063] [Citation(s) in RCA: 14] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 07/17/2019] [Accepted: 04/02/2020] [Indexed: 01/06/2023] Open
Abstract
The relative importance of local environments and dispersal limitation in shaping denitrifier community structure remains elusive. Here, we collected soils from 36 riverine, lacustrine and palustrine wetland sites on the remote Tibetan Plateau and characterized the soil denitrifier communities using high-throughput amplicon sequencing of the nirS and nirK genes. Results showed that the richness of nirS-type denitrifiers in riverine wetlands was significantly higher than that in lacustrine wetlands but not significantly different from that in palustrine wetlands. There was no clear distinction in nir community composition among the three kinds of wetlands. Irrespective of wetland type, the soil denitrification rate was positively related to the abundance, but not the α-diversity, of denitrifying communities. Soil moisture, carbon availability and soil temperature were the main determinants of diversity [operational taxonomic unit (OTU) number] and abundance of thenirS-type denitrifier community, while water total organic carbon, soil NO3- and soil moisture were important in controlling nirK-type denitrifier diversity and abundance. The nirS community composition was influenced by water electrical conductivity, soil temperature and water depth, while the nirK community composition was affected by soil electrical conductivity. Spatial distance explained more variation in the nirS community composition than in the nirK community composition. Our findings highlight the importance of both environmental filtering and spatial distance in explaining diversity and biogeography of soil nir communities in remote and relatively undisturbed wetlands.
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Affiliation(s)
- Xiaoliang Jiang
- CAS Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China.,Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province, Nanyang Normal University, Nanyang 473061, China.,University of Chinese Academy of Sciences, Beijing 100049, China
| | - Wenzhi Liu
- CAS Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China.,Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province, Nanyang Normal University, Nanyang 473061, China
| | - Lunguang Yao
- Collaborative Innovation Center of Water Security for Water Source Region of Mid-line of South-to-North Diversion Project of Henan Province, Nanyang Normal University, Nanyang 473061, China
| | - Guihua Liu
- CAS Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China
| | - Yuyi Yang
- CAS Key Laboratory of Aquatic Botany and Watershed Ecology, Wuhan Botanical Garden, Chinese Academy of Sciences, Wuhan 430074, China.,School of Life Sciences, University of Dundee, Dundee DD1 5EH, Scotland, UK
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17
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Xing W, Wang Y, Hao T, He Z, Jia F, Yao H. pH control and microbial community analysis with HCl or CO 2 addition in H 2-based autotrophic denitrification. WATER RESEARCH 2020; 168:115200. [PMID: 31655440 DOI: 10.1016/j.watres.2019.115200] [Citation(s) in RCA: 38] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/02/2019] [Revised: 10/13/2019] [Accepted: 10/15/2019] [Indexed: 06/10/2023]
Abstract
H2-based autotrophic denitrification is promising to remove nitrate from water or wastewater lacking organic carbon sources, and pH is one of its most important process parameters. HCl and CO2 addition are known as adequate pH control methods for practical purposes. However, because of H2, added CO2 may participate in microbial metabolisms and affect denitrification mechanisms. Here, a combined micro-electrolysis and autotrophic denitrification (CEAD) reactor, in which H2 is generated based on galvanic-cell reactions between zero-valent iron and carbon, was optimized and continuously operated for 233 days by adding HCl or CO2 to control pH in the range of 7.2-8.2. Microbial communities were compared between the two pH-control methods through high-throughput sequencing of 16S rRNA, nirS, and nirK genes. Under a low COD/N ratio of 0.5 in the influent (with ∼36 mgNO3--N/L), when adding HCl, the total nitrogen (TN) removal efficiency reached 91.4% ± 0.9% with a 28-h hydraulic retention time (HRT). When adding CO2, the TN removal efficiency was improved to 96.5% ± 1.7% with 24-h HRT. Significant differences of 16S rRNA and nirS genes between the two pH-control stages indicated the variation of microbial communities and nirS-type denitrifiers. With HCl addition, Thiobacillus, unclassified Comamonadaceae, Arenimonas, Limnobacter, and Thermomonas, which were reported previously as likely autotrophic or heterotrophic denitrifiers, were most dominant in the biofilms. With CO2 addition, the biofilms became dominated by Anaerolineaceae and Methylocystaceae (related to organic carbon metabolism), Denitratisoma (likely heterotrophic denitrifier), and uncultured bacteria TK10 and AKYG587. The results suggest that the added CO2 not only contributed to pH control but also participated in microbial metabolisms. This study provides useful insights into microbial mechanisms and further optimization of H2-based autotrophic denitrification in water and wastewater treatment.
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Affiliation(s)
- Wei Xing
- Department of Civil and Environmental Engineering, Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, China.
| | - Yan Wang
- Department of Civil and Environmental Engineering, Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, China
| | - Tianyu Hao
- Department of Civil and Environmental Engineering, Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, China
| | - Zhenglan He
- Department of Civil and Environmental Engineering, Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, China
| | - Fangxu Jia
- Department of Civil and Environmental Engineering, Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, China
| | - Hong Yao
- Department of Civil and Environmental Engineering, Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard, School of Civil Engineering, Beijing Jiaotong University, Beijing, 100044, China.
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18
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Zhang H, Feng J, Chen S, Zhao Z, Li B, Wang Y, Jia J, Li S, Wang Y, Yan M, Lu K, Hao H. Geographical Patterns of nirS Gene Abundance and nirS-Type Denitrifying Bacterial Community Associated with Activated Sludge from Different Wastewater Treatment Plants. MICROBIAL ECOLOGY 2019; 77:304-316. [PMID: 30046860 DOI: 10.1007/s00248-018-1236-7] [Citation(s) in RCA: 77] [Impact Index Per Article: 15.4] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/01/2018] [Accepted: 07/17/2018] [Indexed: 05/10/2023]
Abstract
Denitrifying bacteria is a driver of nitrogen removal process in wastewater treatment ecosystem. However, the geographical characteristics of denitrifying bacterial communities associated with activated sludge from diverse wastewater treatment plants (WWTPs) are still unclear. Here, quantitative PCR and next-generation sequencing of the nirS gene were applied to characterize the abundance and denitrifying bacterial communities from 18 geographically distributed WWTPs. The results showed that the nirS abundance ranged from 4.6 × 102 to 2.4 × 103 copies per ng DNA, while nirS-type denitrifying bacterial populations were diverse and distinct from activated sludge communities. Among WWTPs, total nitrogen removal efficiencies varied from 25.8 to 84%, which was positively correlated with diversity indices, whereas abundance-based coverage estimator index decreased with an increase in latitude. The dominant phyla across all samples were proteobacteria, accounting for 46.23% (ranging from 17.98 to 87.07%) of the sequences. Eight of the 22 genera detected were dominant: Thauera sp., Alicycliphilus sp., and Pseudomonas sp., etc. Based on network analysis, the coexistence and interaction between dominant genera may be vital for regulating the nitrogen and carbon removal behaviors. Multivariate statistical analysis revealed that both geographic location and wastewater factors concurrently govern the distribution patterns of nirS-type denitrifying bacterial community harbored in WWTPs. Taking together, these results from the present study provide novel insights into the nirS gene abundance and nirS-type denitrifying bacterial community composition in geographically distributed WWTPs. Moreover, the knowledge gained will improve the operation and management of WWTPs for nitrogen removal.
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Affiliation(s)
- Haihan Zhang
- Key Laboratory of Northwest Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China.
- Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China.
- Institute of Environmental Microbial Technology, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China.
| | - Ji Feng
- Key Laboratory of Northwest Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
- Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
- Institute of Environmental Microbial Technology, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
| | - Shengnan Chen
- Key Laboratory of Northwest Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
- Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
- Institute of Environmental Microbial Technology, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
| | - Zhenfang Zhao
- Key Laboratory of Northwest Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
- Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
- Institute of Environmental Microbial Technology, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
| | - Baoqin Li
- Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science and Technology, Guangzhou, 510650, Guangdong Province, People's Republic of China
| | - Yue Wang
- Key Laboratory of Northwest Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
- Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
- Institute of Environmental Microbial Technology, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
| | - Jingyu Jia
- Key Laboratory of Northwest Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
- Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
- Institute of Environmental Microbial Technology, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
| | - Sulin Li
- Key Laboratory of Northwest Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
- Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
- Institute of Environmental Microbial Technology, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
| | - Yan Wang
- Key Laboratory of Northwest Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
- Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
- Institute of Environmental Microbial Technology, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
| | - Miaomiao Yan
- Key Laboratory of Northwest Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
- Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
- Institute of Environmental Microbial Technology, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
| | - Kuanyu Lu
- Key Laboratory of Northwest Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
- Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
- Institute of Environmental Microbial Technology, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
| | - Huiyan Hao
- Key Laboratory of Northwest Resource, Environment and Ecology, MOE, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
- Shaanxi Key Laboratory of Environmental Engineering, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
- Institute of Environmental Microbial Technology, Xi'an University of Architecture and Technology, Xi'an, 710055, People's Republic of China
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19
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Guo Q, Li N, Bing Y, Chen S, Zhang Z, Chang S, Chen Y, Xie S. Denitrifier communities impacted by heavy metal contamination in freshwater sediment. ENVIRONMENTAL POLLUTION (BARKING, ESSEX : 1987) 2018; 242:426-432. [PMID: 30005255 DOI: 10.1016/j.envpol.2018.07.020] [Citation(s) in RCA: 6] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/16/2018] [Revised: 06/08/2018] [Accepted: 07/05/2018] [Indexed: 05/17/2023]
Abstract
Heavy metals are widely detected in natural environments, however their impacts on denitrifier community in freshwater ecosystem remain unclear. The present study investigated the changes of denitrifier communities (based on nosZ (nitrous oxide reductase) gene) in a freshwater reservoir contaminated by a severe accidental spill of heavy metals. The abundance of nosZ-denitrifiers drastically decreased, and their community richness, diversity and structure also showed considerable variations. The mainly detected denitrifying bacteria included Pseudogulbenkiania, Pseudomonas and two unknown groups. These major nosZ-denitrifier groups responded in different ways to heavy metal pollution. Metal contamination could exert a profound influence on denitrifier community in freshwater sediment. This work could provide some new insights to the impact of metal pollution on nitrogen cycling.
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Affiliation(s)
- Qingwei Guo
- South China Institute of Environmental Sciences (SCIES), Ministry of Environment Protection (MEP), Guangzhou 510655, China
| | - Ningning Li
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China
| | - Yongxin Bing
- South China Institute of Environmental Sciences (SCIES), Ministry of Environment Protection (MEP), Guangzhou 510655, China
| | - Sili Chen
- South China Institute of Environmental Sciences (SCIES), Ministry of Environment Protection (MEP), Guangzhou 510655, China
| | - Zhengke Zhang
- South China Institute of Environmental Sciences (SCIES), Ministry of Environment Protection (MEP), Guangzhou 510655, China
| | - Sha Chang
- South China Institute of Environmental Sciences (SCIES), Ministry of Environment Protection (MEP), Guangzhou 510655, China
| | - Yao Chen
- South China Institute of Environmental Sciences (SCIES), Ministry of Environment Protection (MEP), Guangzhou 510655, China
| | - Shuguang Xie
- State Key Joint Laboratory of Environmental Simulation and Pollution Control, College of Environmental Sciences and Engineering, Peking University, Beijing 100871, China.
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20
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Xing W, Li J, Li D, Hu J, Deng S, Cui Y, Yao H. Stable-Isotope Probing Reveals the Activity and Function of Autotrophic and Heterotrophic Denitrifiers in Nitrate Removal from Organic-Limited Wastewater. ENVIRONMENTAL SCIENCE & TECHNOLOGY 2018; 52:7867-7875. [PMID: 29902378 DOI: 10.1021/acs.est.8b01993] [Citation(s) in RCA: 14] [Impact Index Per Article: 2.3] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 06/08/2023]
Abstract
Combined heterotrophic and autotrophic denitrification (HAD) is a sustainable and practical method for removing nitrate from organic-limited wastewater. However, the active microorganisms responsible for denitrification in wastewater treatment have not been clearly identified. In this study, a combined microelectrolysis, heterotrophic, and autotrophic denitrification (CEHAD) process was established. DNA-based stable isotope probing was employed to identify the active denitrifiers in reactors fed with either 13C-labeled inorganic or organic carbon sources. The total nitrogen removal efficiencies reached 87.2-92.8% at a low organic carbon concentration (20 mg/L COD). Real-time polymerase chain reaction of the nirS gene as a function of the DNA buoyant density following the ultracentrifugation of the total DNA indicated marked 13C-labeling of active denitrifiers. High-throughput sequencing of the fractionated DNA in H13CO3-/12CH312COO--fed and H12CO3-/13CH313COO--fed reactors revealed that Thermomonas-like phylotypes were labeled by 13C-bicarbonate, while Thauera-like and Comamonas-like phylotypes were labeled by 13C-acetate. Meanwhile, Arenimonas-like and Rubellimicrobium-like phylotypes were recovered in the "heavy" DNA fractions from both reactors. These results suggest that nitrate removal in CEHAD is catalyzed by various active microorganisms, including autotrophs, heterotrophs, and mixotrophs. Our findings provide a better understanding of the mechanism of nitrogen removal from organic-limited water and wastewater and can be applied to further optimize such processes.
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Affiliation(s)
- Wei Xing
- School of Civil Engineering , Beijing Jiaotong University , Beijing 100044 , China
- Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard , Beijing 100044 , China
| | - Jinlong Li
- School of Civil Engineering , Beijing Jiaotong University , Beijing 100044 , China
| | - Desheng Li
- School of Civil Engineering , Beijing Jiaotong University , Beijing 100044 , China
- Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard , Beijing 100044 , China
| | - Jincui Hu
- School of Civil Engineering , Beijing Jiaotong University , Beijing 100044 , China
| | - Shihai Deng
- School of Civil Engineering , Beijing Jiaotong University , Beijing 100044 , China
| | - Yuwei Cui
- School of Civil Engineering , Beijing Jiaotong University , Beijing 100044 , China
| | - Hong Yao
- School of Civil Engineering , Beijing Jiaotong University , Beijing 100044 , China
- Beijing Key Laboratory of Aqueous Typical Pollutants Control and Water Quality Safeguard , Beijing 100044 , China
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