期刊
BIORESOURCE TECHNOLOGY
卷 297, 期 -, 页码 -出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2019.122470
关键词
Electric-field assisted aerobic composting; Nitrification; N2O emission; Functional genes
资金
- National Natural Science Foundation of China [41977094]
- National Key Technologies R&D Program of China [2017YFD0800203]
- Key Technologies R&D Program of Fujian [2017NZ0001-1]
- Program for Innovative Research Team in Science and Technology in Fujian Province University (IRTSTFJ)
- Fujian Science and Technology Department Natural Science Fund Project [2018Y4011]
Nitrous oxide (N2O) emission is a serious environmental problem in composting. Previous studies have indicated that electric field assistance results in lower N(2)Oemissions in aerobic composting; however, the exact mechanisms involved in electric-field assisted aerobic composting (EAAC) are not clear. In this study, the biological N transformation processes and the N-associated genes were investigated. The results demonstrated that electric field application inhibited nitrification, weakened the nitrifying functional genes (the hao and nxrA genes declined maximally by 86% and 86.8%, respectively), and increased the N2O consumption-related gene (nosZ) by a maximum factor of 2.76 compared with that in CAC. The correlation analysis demonstrated that nitrification was the main source of N2O emission in EAAC. The findings imply that EAAC is a promising process for mitigating N2O emission at the source during aerobic composting.
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