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New molecular method to detect denitrifying anaerobic methane oxidation bacteria from different environmental niches

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Journal of Environmental Sciences 2018年第3期30卷 367-374页

作者： Sai Xu Wenjing Lu Farooq Mustafa Muhammad Yanting Liu Hanwen Guo Ruihong Meng Hongtao Wang School of Environment Tsinghua University Key Laboratory for Solid Waste Management and Environment Safety (Tsinghua University) Ministry of Education of ChinaTsinghua University

The denitrifying anaerobic methane oxidation is an ecologically important process for reducing the potential methane emission into the *** responsible bacterium for this process was Candidatus Methylomirabilis oxyfera belonging to the bacterial phylum of *** this study,a new pair of primers targeting all the five groups of NC10 bacteria was designed to amplify NC10 bacteria from different environmental *** results showed that the group A was the dominant NC10 phylum bacteria from the sludges and food waste digestate while in paddy soil samples,group A and group B had nearly the same *** results also indicated that NC10 bacteria could exist in a high p H environment（pH 9.24）from the food waste treatment *** Pearson relationship analysis showed that the p H had a significant positive relationship with the NC10 bacterial diversity（p0.05）.The redundancy analysis further revealed that the p H,volatile solid and nitrite nitrogen were the most important factors in shaping the NC10 bacterial structure（p=0.01）based on the variation inflation factors selection and Monte Carlo test（999 times）.Results of this study extended the existing molecular tools for studying the NC10 bacterial community structures and provided new information on the ecological distributions of NC10 bacteria.

关键词： NC10 bacteria anaerobic methane oxidation Molecular primer Candidatus Methylomirabilis oxyfera

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Combining biological denitrification and electricity generation in methane-powered microbial fuel cells

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Journal of Environmental Sciences 2023年第8期130卷 212-222页

作者： Linpeng Yu Eryi Zhang Lin Yang Shiqi Liu Christopher Rensing Shungui Zhou Resources and Environment Fujian Agriculture and Forestry UniversityFuzhou 350002China Cranfield University CranfieldBedfordshire MK43 OALUK Biofuels Institute School of Environment and Safety EngineeringJiangsu UniversityZhenjiang 212013China

methane has been demonstrated to be a feasible substrate for electricity generation in microbial fuel cells(MFCs)and denitrifying anaerobic methane oxidation(DAMO).However,these two processes were evaluated separately in previous studies and it has remained unknown whether methane is able to simultaneously drive these *** we investigated the co-occurrence and performance of these two processes in the anodic chamber of *** results showed that methane successfully fueled both electrogenesis and ***,the maximum nitrate removal rate was significantly enhanced from(1.4±0.8)to(18.4±1.2)mg N/(L·day)by an electrogenic *** the presence of DAMO,the MFCs achieved a maximum voltage of 610 mV and a maximum power density of 143±12 mW/m^(2).Electrochemical analyses demonstrated that some redox substances(***)were likely involved in electrogenesis and also in the denitrification ***-throughput sequencing indicated that the methanogen Methanobacterium,a close relative of Methanobacterium espanolae,catalyzed methane oxidation and cooperated with both exoelectrogens and denitrifiers(e.g.,Azoarcus).This work provides an effective strategy for improving DAMO in methane-powered MFCs,and suggests that methanogens and denitrifiers may jointly be able to provide an alternative to archaeal DAMO for methane-dependent denitrification.

关键词： anaerobic methane oxidation Denitrification Microbial fuel cells Electricity generation Electroactive compounds Methanobacterium

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Acid Orange 7 degradation using methane as the sole carbon source and electron donor

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Frontiers of Environmental Science & Engineering 2022年第3期16卷 81-89页

作者： Yanan Bai Xiuning Wang Fang Zhang Raymond Jianxiong Zeng School of Applied Meteorology Nanjing University of Information Science and TechnologyNanjing 210044China Fujian Provincial Key Laboratory of Soil Environmental Health and Regulation College of Resources and EnvironmentFujian Agriculture and Forestry UniversityFuzhou 350002China Advanced Laboratory for Environmental Research and Technology USTC-CityUSuzhou 215123China CAS Key Laboratory of Urban Pollutant Conversion Department of Applied ChemistryUniversity of Science and Technology of ChinaHefei 230026China

Azo dyes are widely applied in the textile industry but are not entirely consumed during the dyeing process and can thus be discharged to the environment in ***,azo dyes can be degraded using various electron donors,and in this paper,Acid Orange 7(AO7)degradation performance is investigated using methane(CH4)as the sole electron *** has multiple sources and is readily available and *** using ^(13)C-labeled isotopes showed that AO7 degradation was coupled with anaerobic oxidation of methane(AOM)and,subsequently,affected by the initial concentrations of *** concentrations of AO7 could inhibit the activity of microorganisms,which was confirmed by the long-term performance of AO7 degradation,with maximum removal rates of 8.94 mg/(L·d)in a batch reactor and 280 mg/(L·d)in a hollow fiber membrane bioreactor(HfMBR).High-throughput sequencing using 16S rRNA genes showed that Candidatus Methanoperedens,affiliated to ANME-2d,dominated the microbial community in the batch reactor and ***,the relative abundance of Proteobacteria bacteria(Phenylobacterium,Pseudomonas,and Geothermobacter)improved after AO7 *** outcome suggested that ANME-2d alone,or acting synergistically with partner bacteria,played a key role in the process of AO7 degradation coupled with AOM.

关键词： Azo dyes AO7 degradation anaerobic methane oxidation Microbial community ANME-2d

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