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Speciated atmospheric mercury at the Waliguan Global Atmosphere Watch station in the northeastern Tibetan Plateau: implication of dust-related sources for particulate bound mercury
Zhang, Hui; Fu, Xuewu; Yu, Ben; Li, Baoxin; Liu, Peng; Zhang, Guoqing; Zhang, Leiming; Feng, Xinbin
2021-12-25
Source PublicationATMOSPHERIC CHEMISTRY AND PHYSICS
ISSN0048-9697
Volume799Pages:-
AbstractDenitrifying anaerobic methane oxidation (DAMO) is an important microbial metabolic process that simultaneously converts of methane and nitrite. In this study, electrochemical systems were investigated for DAMO with nitrite as an electron acceptor. The results showed that the auxiliary voltage enhanced anaerobic methane oxidation and nitrite reduction. The greatest methane conversion (26.61 mg L-1 d(-1)) was obtained at an auxiliary voltage of 1.6V (EMN-1.6). Isotope tracing indicated that carbon dioxide was the oxidation product of methane, and methanol was the intermediate. The power density reached 0.60 (for EMN-0.5, the bioreactor with a voltage of 0.5 V) and 3.77 mW m(-2) (for EMN-1.6). DAMO microbes, Methylocystis sp., and Methylomonas sp. were identified as methanotrophs. Rhodococcus sp., Hyphomicrobium sp., and Thiobacillus sp. were the dominant denitrifying bacteria. The conversion pathway was speculated to be as follows: methane was oxidized to carbon dioxide and nitrite was reduced to nitrogen. The two processes were independently completed by DAMO bacteria and oxygen was simultaneously generated. For the electron transfer pathway, methanotrophs utilized the oxygen released by DAMO bacteria to convert methane into organic matter (e.g. methanol). These organic compounds were utilized by Pseudoxanthomonas sp. and Pseudomonas sp., and the generated electrons were then released to the outside of the cells and transferred to the anode. Denitrifying bacteria received electrons at the cathode, transferred them to the interior of the cell, and then converted nitrite into nitrogen. This research explored an effective consortium and a method for methane and nitrogen removal. (C) 2021 Elsevier B.V. All rights reserved.
Department环境化学与生态毒理学国家重点实验室
KeywordAnaerobic methane oxidation Electrochemical system DAMO microbes Electricity generation Potential pathway
Document Type期刊论文
Identifierhttps://ir.rcees.ac.cn/handle/311016/46825
Collection环境化学与生态毒理学国家重点实验室
Affiliation1.Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, 99 Lincheng West Rd, Guiyang 550081, Peoples R China
2.Chinese Acad Sci, CAS Ctr Excellence Quaternary Sci & Global Change, Inst Earth Environm, Xian 710061, Peoples R China
3.Chinese Acad Sci, Res Ctr Ecoenvironm Sci, State Key Lab Environm Chem & Ecotoxicol, Beijing 100085, Peoples R China
4.Qinghai Meteorol Bur, China Global Atmosphere Watch Baseline Observ, Xining 810001, Peoples R China
5.Environm & Climate Change Canada, Sci & Technol Branch, Air Qual Res Div, Toronto, ON M3H 5T4, Canada
6.[Feng, Xinbin
7.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
Recommended Citation
GB/T 7714
Zhang, Hui,Fu, Xuewu,Yu, Ben,et al. Speciated atmospheric mercury at the Waliguan Global Atmosphere Watch station in the northeastern Tibetan Plateau: implication of dust-related sources for particulate bound mercury[J]. ATMOSPHERIC CHEMISTRY AND PHYSICS,2021,799:-.
APA Zhang, Hui.,Fu, Xuewu.,Yu, Ben.,Li, Baoxin.,Liu, Peng.,...&Feng, Xinbin.(2021).Speciated atmospheric mercury at the Waliguan Global Atmosphere Watch station in the northeastern Tibetan Plateau: implication of dust-related sources for particulate bound mercury.ATMOSPHERIC CHEMISTRY AND PHYSICS,799,-.
MLA Zhang, Hui,et al."Speciated atmospheric mercury at the Waliguan Global Atmosphere Watch station in the northeastern Tibetan Plateau: implication of dust-related sources for particulate bound mercury".ATMOSPHERIC CHEMISTRY AND PHYSICS 799(2021):-.
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