产甲烷
甲烷利用细菌
产甲烷菌
甲烷
甲烷厌氧氧化
锰
环境化学
古细菌
无氧运动
环境科学
废水
人工湿地
湿地
环境工程
化学
生态学
生物
有机化学
基因
生物化学
生理学
作者
Wenbo Liu,Haiwen Xiao,Hongpu Ma,Yuanyuan Li,Tanveer M. Adyel,Jun Zhai
标识
DOI:10.1016/j.cej.2019.123402
摘要
The considerable amount of methane (CH4) emitted from constructed wetlands (CWs) during wastewater treatment has the potential to intensify global climate change. Reducing CH4 emissions from CWs is, therefore, an important step in mitigating global warming. In this study, we compared CH4 emission fluxes from long-term operated pilot-scale vertical-flow CWs with natural manganese ore (Mn-CW) and gravel (Gr-CW, control) as a substrate without any seeding sludge or sediment added. The CH4 emission from the Mn-CW (3.01 ± 0.38 g C/m2/day) was significantly lower than the emission from the Gr-CW (5.50 ± 0.24 g C/m2/day). Mn(IV)-dependent anaerobic oxidation of CH4 (Mn-AOM) occurred in the Mn-CW, and was estimated to account for 66% of the total CH4 emissions reduction. The anaerobic methanotrophic archaea lineage ANME-2d present in the Mn-CW was considered the likely methanotroph that mediated Mn-AOM. Anaerobic fermentation, dissimilatory Mn reduction, and hydrogenotrophic methanogenesis were the main processes responsible for the degradation of organics in the Mn-CW. The acetoclastic methanogen archaea were suppressed in the Mn-CW. For the first time, Mn-AOM was demonstrated to be spontaneously present in the freshwater CWs. Our findings also demonstrated a novel approach to mitigate CH4 emissions from CWs, and indicate potential strategies against global climate change.
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