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研究报告

慈曼婷,郭淑丽,杨文意,董静杰,周浩民,沈东升,龙於洋.填埋场内温度场下渗滤液饱和带内硫酸盐还原行为表征[J].环境科学学报,2023,43(2):278-285

Characterization of sulfate-reducing behavior in leachate saturated zone of landfill under temperature field

摘要：填埋场内渗滤液饱和带是物质交换和生化反应的活跃区域，也是含硫恶臭的主要发生源.本研究探究了填埋场内温度场下渗滤液饱和带内硫酸盐还原行为特征，结果表明，在25 ~ 55 ℃逐步升温的温度场下，渗滤液饱和带内的硫酸盐还原行为逐步增强且差异显著.渗滤液饱和带纵向SO₄^2-和DOC迁移转化规律各异但趋势相同. 硫酸盐还原行为主要发生在固液交界区和固相区，且固液交界区的电子供、受体呈特定化学计量关系. 电子供体是引起硫酸盐还原行为差异的主要原因.本研究揭示的温度场下渗滤液饱和带内硫酸盐还原行为可为填埋场精准除臭提供重要依据.

Abstract：The landfill leachate saturated zone is an active area of substance exchange and biochemical reaction， and it is also the main source of sulfur-containing odor. This research investigated the sulfate-reducing behavior in the leachate saturated zone under temperature field. Results show that the sulfate-reducing behavior in the leachate saturated zone increases gradually and differs significantly under the temperature field from 25 ℃ to 55 ℃. The vertical migration and transformation of SO₄^2- and DOC in leachate saturated zone has the same trend but differs with each other. The sulfate-reducing behavior mainly occurs in the solid-liquid interface and solid phase zone. Specific stoichiometric relationship was observed between electron donors and electron acceptors in the solid-liquid interface. Electron donor is the main contributor of sulfate-reducing behavior discrepancy. The sulfate-reducing behavior in leachate saturated zone under temperature field elucidated in this research can provide significant basis for accurate landfill odor control.