生物淋滤预处理对污泥堆肥过程中氧化亚氮排放相关功能基因的影响。
Effects of bioleaching pretreatment on nitrous oxide emission related functional genes in sludge composting process.
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 Oct;266:181-188. doi: 10.1016/j.biortech.2018.06.049. Epub 2018 Jun 19.
The effect of bioleaching pretreatment on NO generation in sludge composting process was firstly investigated in this study. The relationships among physicochemical factors, NO and NH emission and related functional genes were analyzed in 60 days composting of bioleaching dewatering sludge (BDS) and filter press dewatering sludge (FDS), respectively. The results showed the cumulative amounts of NH and NO emission from the BDS composting system were reduced by 83.52% and 54.76% after bioleaching pretreatment, respectively. The lower moisture and pH, and the higher ORP and the concentrations of NH-N, NO-N and NO-N were observed in BDS during the composting compared to FDS. Furthermore, bioleaching pretreatment improved the relative abundance of hao but reduced amoA, nirK and norB in the BDS during the composting. The low pH level and the reduction of nirK and norB in BDS were the main reasons mitigating NH and NO emissions, respectively.
本研究首次考察了生物沥滤预处理对污泥堆肥过程中 NO 生成的影响。分别分析了生物沥滤脱水污泥（BDS）和压滤脱水污泥（FDS）在 60 天堆肥过程中理化因素、NO 和 NH 排放与相关功能基因之间的关系。结果表明，生物沥滤预处理后，BDS 堆肥系统中 NH 和 NO 排放总量分别减少了 83.52%和 54.76%。与 FDS 相比，BDS 堆肥过程中的水分和 pH 值较低，ORP 和 NH-N、NO-N 和 NO-N 浓度较高。此外，生物沥滤预处理提高了 hao 的相对丰度，但降低了 BDS 中 amoA、nirK 和 norB 的相对丰度。BDS 中较低的 pH 值水平和 nirK 和 norB 的减少是分别减轻 NH 和 NO 排放的主要原因。
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