Ma Shuangshuang, Sun Xiaoxi, Fang Chen, He Xueqin, Han Lujia, Huang Guangqun
Laboratory of Biomass and Bioprocessing Engineering, College of Engineering, China Agricultural University, Beijing 100083, China.
Laboratory of Biomass and Bioprocessing Engineering, College of Engineering, China Agricultural University, Beijing 100083, China.
Waste Manag. 2018 Aug;78:393-400. doi: 10.1016/j.wasman.2018.06.005. Epub 2018 Jun 23.
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.
在好氧堆肥过程中减少甲烷的产生和排放非常重要。在本研究中，考察了猪粪和小麦秸秆堆肥过程中使用半透膜覆盖的效果。使用了两个实验室规模的堆肥反应器：膜覆盖处理（处理A）和对照处理（处理B）。与对照处理相比，处理A中的堆肥有效地提高了氧气利用率，并使甲烷排放量降低了22.42%。功能基因的定量分析和Pearson秩相关性分析表明，mcrA和mcrA/pmoA基因丰度与温度呈显著正相关，与间隙氧浓度呈负相关，且pmoA基因丰度与碳氮比和水分含量呈正相关。因此，提高通气速率并优化碳氮比和水分含量将减少甲烷排放。总之，结果表明覆盖膜可能是一种减少堆肥过程中甲烷排放的新策略。
