期刊
BIORESOURCE TECHNOLOGY
卷 320, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2020.124296
关键词
Constructed wetland matrix system; Iron reduction; Anaerobic oxidation of methane; CH4 emissions
资金
- Key Project of Natural Science Foundation of Shandong Province [ZR2018ZC08N4]
- National Natural Science Foundation of China [51978385, 51720105013]
- Shandong Provincial Key Research and Development Program (Major Scientific and Technological Innovation Project) [2019JZZY010411]
- Shandong University Interdisciplinary Research and Innovation Team of Young Scholars [2020QNQT20]
Iron oxides and dissimilated metal-reducing bacteria can reduce CH4 emissions in constructed wetlands by promoting methane production and reducing the activity of enzymes involved in CH4 emission pathways.
Iron oxides and dissimilated metal-reducing bacteria (DMRB) have been reported to result in a reduction in methane (CH4) emissions in constructed wetlands (CWs), but their mechanisms on CH4 production and oxidation remains unclear. Here, a set of CW matrix systems (Control, Fe-CWs, and FeB-CWs) was established to analyze the CH4 emission reduction from various angles, including the valencies of iron, microbial community structure and enzyme activity. The results revealed that the addition of iron oxides promoted the electron transfer between methanogens and Geobacter to promote CH4 production, but it was interesting that iron oxides also reduced the enzymes involved in the carbon dioxide (CO2) reduction pathway and promoted the enzymes that participated in anaerobic oxidation of methane (AOM) thereby leading to the overall reduction in CH4 emissions. Moreover, DMRB could promote iron reduction thereby further reducing CH4 emissions by promoting AOM and competing with methanogens for organic substrates.
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