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Exploring the mechanisms of decreased methane during pig manure and wheat straw aerobic composting covered with a semi-permeable membrane
- Ma, Shuangshuang, Sun, Xiaoxi, Fang, Chen, He, Xueqin, Han, Lujia, Huang, Guangqun
- Waste management 2018 v.78 pp. 393-400
- aeration, carbon, composting, genes, methane, methane production, nitrogen, oxygen, pig manure, temperature, water content, wheat straw
- It is very important to reduce methane production and emission during aerobic composting. In this study, the effects of covering with a semi-permeable membrane during pig manure and wheat straw composting were investigated. Two laboratory-scale composting reactors were used: the membrane covered treatment (treatment A) and the control treatment (treatment B). Composting in treatment A effectively improved the oxygen utilization rate and decreased methane emissions by 22.42% relative to the control treatment. Quantification of functional genes and Pearson rank correlations showed that the mcrA and mcrA/pmoA gene abundances were significantly positively correlated with temperature and negatively correlated with the interstitial oxygen concentration, and that the pmoA gene abundance was positively correlated with the carbon: nitrogen ratio and moisture content. Therefore, increasing the aeration rate and optimizing the carbon: nitrogen ratio and moisture content will decrease methane emissions. Together, the results demonstrate that coverage membrane could be a novel strategy for reducing methane emissions during composting.