Article
Environmental Sciences
Tianjing Shi, Xinying Liu, Yiting Xue, Fang He, Yan Dang, Dezhi Sun
Summary: The study found that applying a potential of +0.8 V significantly improved the efficiency of the denitrifying anaerobic methane oxidation process, increasing the rate of nitrite conversion to nitrogen and promoting the enrichment of DAMO functional bacteria. LC-MS metabolomics analysis showed that the regulation of key metabolites by applied potential was beneficial for enhancing the DAMO process.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Environmental Sciences
Tianjing Shi, Xinying Liu, Yiting Xue, Fang He, Yan Dang, Dezhi Sun
Summary: In this study, it was found that applying potential significantly influenced the denitrifying anaerobic methane oxidation (DAMO) process. The optimal potential of +0.8 V increased the nitrite removal rate by 4.5 times and facilitated the enrichment of DAMO functional bacteria. Metabolomics analysis showed that applying potential affected the regulation of key metabolites related to metabolic pathways, leading to positive effects on DAMO process. Applying electric potential could be a useful strategy in methane and nitrogen removal.
JOURNAL OF ENVIRONMENTAL MANAGEMENT
(2022)
Article
Microbiology
Chuwen Zhang, Rainer U. Meckenstock, Shengze Weng, Guangshan Wei, Casey R. J. Hubert, Jiang-Hai Wang, Xiyang Dong
Summary: This study identified diverse bacterial and archaeal lineages involved in anaerobic degradation of alkanes and methylated aromatic hydrocarbons in marine sediments, including the presence of fumarate-adding enzymes (FAE). These microorganisms, found in hydrocarbon-impacted sediments, potentially degrade hydrocarbons through sulfate reduction or fermentation, expanding our understanding of the ecological roles of these organisms in marine ecosystems.
FEMS MICROBIOLOGY ECOLOGY
(2021)
Article
Biodiversity Conservation
Junxia Liu, Dan Xue, Huai Chen, Ji Hu, Xinya Huang, Jianliang Liu, Xuhui Chen, Liangfeng Liu
Summary: The study found that nitrogen addition did not increase the potential of AOM in Zoige peatlands, but instead had an inhibitory effect on it; Different soil layers had different responses to the two forms of nitrogen, reflecting variable needs for different forms of nitrogen in different soil layers; Soil water content, dissolved organic carbon, iron content, and pH played important roles in the potential of AOM in the Zoige peatlands.
ECOLOGICAL INDICATORS
(2021)
Article
Engineering, Environmental
Xueqin Zhang, Mengying Xie, Chen Cai, Hesamoddin Rabiee, Zhiyao Wang, Bernardino Virdis, Gene W. Tyson, Simon J. McIlroy, Zhiguo Yuan, Shihu Hu
Summary: This study demonstrates the role of pyrogenic carbon (PC) in mitigating greenhouse gas emissions by promoting Fe(III)-dependent anaerobic oxidation of methane (AOM). PC enhances the AOM rate and Fe(III) reduction through electron transfer mechanisms. The findings highlight the potential of PC-facilitated Fe(III)-dependent AOM in reducing methane emissions.
ENVIRONMENTAL SCIENCE & TECHNOLOGY
(2023)
Article
Environmental Sciences
Yiting Xue, Xinying Liu, Yan Dang, Tianjing Shi, Dezhi Sun
Summary: This research utilized granular active carbon (GAC) to enhance the nitrate-dependent DAMO process, leading to significantly higher nitrate removal rate and relative abundance of DAMO archaea compared to the non-amended control.
ENVIRONMENTAL RESEARCH
(2022)
Article
Engineering, Environmental
Chengyuan Su, Qiujin Deng, Zhengpeng Chen, Xinya Lu, Zun Huang, Xin Guan, Menglin Chen
Summary: The study demonstrates that the addition of betaine can promote the growth of DAMO bacteria and improve the nitrogen removal rate during the DAMO process. However, as the dosage of betaine increases, it results in changes in some microbial communities, possibly due to the increased methyl donors limiting the growth of DAMO microorganisms. This is evidenced by the metagenomic analysis showing changes in denitrification and methane metabolism pathways with the increased betaine dosage.
JOURNAL OF HAZARDOUS MATERIALS
(2021)
Article
Green & Sustainable Science & Technology
Tugui Yuan, Ran Sun, Mingshuai Shao, Qiyong Xu
Summary: The combination of sludge load control and iron oxide addition strategies has a significant influence on food waste anaerobic digestion. Low sludge loads or iron oxide addition can enhance digestion performance. Low sludge loads promoted substrate hydrolysis and volatile fatty acids degradation, while iron oxide addition increased the methane yield and maximum methane production rate by promoting hydrolysis and interspecies electron transfer among microbes. However, excessive iron oxide dosage may limit the economic benefits. Overall, simultaneous control of sludge load and iron oxide addition can optimize the anaerobic digestion performance.
Editorial Material
Microbiology
Lisa Y. Y. Stein
Summary: An anaerobic methanotrophic archaeon, 'Candidatus Methanoperedens nitroreducens', divides itself into two distinct populations in terms of morphology and function, allowing for adaptation and cross-species interactions in a dynamic bioreactor ecosystem.
NATURE MICROBIOLOGY
(2023)
Review
Green & Sustainable Science & Technology
Valentina Stazi, Maria Concetta Tomei
Summary: The growth of interest in public health and environmental protection is leading to a closer look at anaerobic wastewater treatment as a sustainable and energy-efficient alternative to aerobic treatment methods. Strategies for recovering dissolved CH4 as an energy source, along with biological oxidation methods, are key to achieving energy-neutral anaerobic treatment. This review highlights the importance of understanding and optimizing technologies for dissolved CH4 recovery in wastewater treatment processes.
JOURNAL OF CLEANER PRODUCTION
(2021)
Article
Biotechnology & Applied Microbiology
Maxi Estefany Huaman Cordova, Hellen Luisa de Castro e Silva, Regina Mambeli Barros, Electo Eduardo Silva Lora, Ivan Felipe Silva dos Santos, Joao Victor Rocha de Freitas, Afonso Henriques Moreira Santos, Juliano Romanzini Pedreira, Barbara K. Flauzino
Summary: This study analyzed the effect of magnetite powder on methane production during the anaerobic digestion process of pig slurry, and found that the addition of magnetite significantly increased methane yield. The concentrations of trace elements were consistent with literature data, contributing to the smooth progress of the enzymatic activities of the methanogenic microorganisms.
ENVIRONMENTAL TECHNOLOGY & INNOVATION
(2022)
Article
Geochemistry & Geophysics
Thomas Giunta, Edward D. Young, Jabrane Labidi, Pierre Sansjofre, Didier Jezequel, Jean-Pierre Donval, Christophe Brandily, Livio Ruffine
Summary: Microbial methane oxidation plays a crucial role in the global methane budget on Earth, and the isotopic signatures of methane can be used to track both aerobic and anaerobic methanotrophy. This study investigates the isotopic compositions in two different methanotrophic environments, Lake Pavin and Black Sea sediments, and reveals distinct isotopic fractionation patterns between aerobic and anaerobic methanotrophy.
GEOCHIMICA ET COSMOCHIMICA ACTA
(2022)
Review
Biotechnology & Applied Microbiology
R. B. Costa, P. N. L. Lens, E. Foresti
Summary: Anaerobic technologies play a crucial role in sewage treatment and recovering marketable products from waste, but they often lead to methane oversaturation and lack of nitrogen removal. However, combining methane oxidation with denitrification processes can address both issues simultaneously.
CRITICAL REVIEWS IN BIOTECHNOLOGY
(2022)
Article
Geology
Zhiyong Lin, Xiaoming Sun, Andrew P. Roberts, Harald Strauss, Yang Lu, Xin Yang, Junli Gong, Guanhua Li, Benjamin Brunner, Jorn Peckmann
Summary: The study reports a novel authigenic nanoscale magnetite source in marine methane seep sediments, with characteristics of larger particles and distinctive structures, mainly as a byproduct of microbial iron reduction within methanic sediments with rapidly changing redox conditions. This magnetite may have formed due to alterations in redox conditions within methane sediments.
Article
Engineering, Environmental
Ling-Dong Shi, Zhen Wang, Tao Liu, Mengxiong Wu, Chun-Yu Lai, Bruce E. Rittmann, Jianhua Guo, He-Ping Zhao
Summary: Methane as an electron donor can be used for biological reduction of oxidized contaminants, offering a promising solution. Research on related microorganisms and metabolic pathways has increased in recent years, with ongoing experimental demonstrations of methane oxidation.