深入了解成熟堆肥回收对污泥堆肥中 NO 排放和反硝化基因的影响。
Insight into effects of mature compost recycling on NO emission and denitrification genes in sludge composting.
机构信息
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin, Heilongjiang 150090, China.
State Key Laboratory of Urban Water Resource and Environment, School of Environment, Harbin Institute of Technology, 73 Huanghe Road, Harbin, Heilongjiang 150090, China.
出版信息
Bioresour Technol. 2018 Mar;251:320-326. doi: 10.1016/j.biortech.2017.12.077. Epub 2017 Dec 26.
Mature compost recycling is widely used to reduce the dosage of organic bulking agent in actual composting process. In this study, the effects of mature compost amendment on NO emission and denitrification genes were investigated in 47 days composting of sewage sludge and rice husks. The results showed that mature compost amendment dramatically augmented NO emission rate in mesophilic phase and CO emission rate in thermophilic phase of composting, respectively. The cumulative amount of NO emission increased by more than 23 times compared to the control. Mature compost amendment not only reduced moisture and pH, but also significantly increased NO-N and NO-N concentrations. The correlation matrices indicated that NO-N, narG and norB were the main factors influencing NO emission rate in sludge composting with mature compost recycling, but the NO emission rate was significantly correlated to NO-N, nirK and norB in the control.
成熟堆肥回收广泛用于减少实际堆肥过程中有机膨胀剂的用量。在这项研究中，研究了成熟堆肥对污水污泥和稻壳 47 天堆肥过程中 NO 排放和反硝化基因的影响。结果表明，成熟堆肥的添加分别显著增加了堆肥中中温期的 NO 排放速率和高温期的 CO 排放速率。与对照相比，NO 排放量的累积量增加了 23 倍以上。成熟堆肥的添加不仅降低了水分和 pH 值，而且还显著增加了 NO-N 和 NO-N 浓度。相关矩阵表明，在成熟堆肥回收的污泥堆肥中，NO-N、narG 和 norB 是影响 NO 排放速率的主要因素，但在对照中，NO 排放速率与 NO-N、nirK 和 norB 显著相关。
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