膨松剂对污泥堆肥中温室气体及相关基因的影响。
Effects of bulking agents on greenhouse gases and related genes in sludge composting.
机构信息
State Key Laboratory of Urban Water Resource and Environment, Harbin Institute of Technology, Harbin 150090, China.
Harbin Institute of Technology National Engineering Research Center of Water Resources Co., Ltd, Harbin 150090, China; Guangdong Yuehai Water Investment Co., Ltd., Shenzhen 518021, China.
出版信息
Bioresour Technol. 2022 Jan;344(Pt B):126270. doi: 10.1016/j.biortech.2021.126270. Epub 2021 Nov 2.
The effect of organic bulking agents on CO, NH, NO and CH emission and related genes was evaluated in 40 days sludge composting with wood chip, wheat straw and rice husk, respectively. The results showed wood chip had the highest C/N of 111.3, total porosity of 93.13% and aeration porosity of 78.98% among three bulking agents. Wheat straw had the highest water-holding porosity of 25.62%, which could be critical factor increasing CH production and reducing NH emission. Moreover, there was no significant difference in NO emission rates in three composting systems with three bulking agents. RDA analysis showed a negative correlation between mcrA and NH + 4-N. Nitrate content in raw feedstock was dominant factor limiting NO yield due to low amoA. The continuous increase of oxidation-reduction potential was significantly positive correlated with pmoA and negative correlation with nirK and norB, which reduced NO and CH production in the curing period.
在 40 天的污泥堆肥中，分别使用木屑、麦秸和稻壳作为有机膨松剂，评估其对 CO、NH、NO 和 CH 排放及相关基因的影响。结果表明，在三种膨松剂中，木屑的 C/N 最高，为 111.3，总孔隙率最高，为 93.13%，通气孔隙率最高，为 78.98%。麦秸的持水孔隙率最高，为 25.62%，这可能是增加 CH 产量和减少 NH 排放的关键因素。此外，三种堆肥系统中，添加三种膨松剂对 NO 排放速率没有显著差异。RDA 分析表明，mcrA 与 NH4+-N 呈负相关。由于 amoA 含量低，原料中硝酸盐含量是限制 NO 产量的主要因素。氧化还原电位的持续升高与 pmoA 呈显著正相关，与 nirK 和 norB 呈负相关，这降低了陈化期的 NO 和 CH 产量。
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