大型填埋场内硫酸盐还原的竖向差异表征  

Vertical differential characterization of sulfate reduction in large landfills

作　　者：金东炎 金之源 慈曼婷 沈东升[1] 龙於洋[1] JIN Dongyan;JIN Zhiyuan;CI Manting;SHEN Dongsheng;LONG Yuyang(Zhejiang Key Laboratory of Solid Waste Treatment and Resource Recovery,School of Environmental Science and Engineering,Zhejiang Gongshang University,Hangzhou 310012)

机构地区：[1]浙江工商大学环境科学与工程学院,浙江省固体废物处理与资源化重点实验室,杭州310012

出　　处：《环境科学学报》2024年第12期197-203,共7页Acta Scientiae Circumstantiae

基　　金：国家自然科学基金(No.41977331,51778579)。

摘　　要：填埋场内硫酸盐还原作用活跃,竖向方向上硫酸盐分布特征差异显著.本文以两座大型卫生填埋场为对象,研究其竖向方向上渗滤液的分布情况、垃圾理化性质和硫酸盐还原静态分布特征.结果表明,两座填埋场内SO_(4)^(2-)和S^(2-)的最高浓度差分别达到2562 mg·kg^(-1)和544 mg·kg^(-1),所有深度均存在硫酸盐还原的痕迹.在非渗滤液饱和区,与硫酸盐还原相关的含硫化物基本不随深度而变化,而渗滤液饱和区的硫酸盐还原程度更高.填埋场表层和底层都有可能出现渗滤液饱和带,其含水率最高可达42%,深刻影响垃圾理化性质,进而间接影响硫酸盐还原过程.各填埋场内的SO_(4)^(2-)与TOC迁移转化规律差异巨大,致使竖向硫酸盐还原过程差异显著,进而导致恶臭气体产生规律难以确定.本研究解析了填埋场硫酸盐还原过程与其内部环境特征的相关性,有助于恶臭气体的进一步防控.Sulfate reduction activity is vigorous within the landfill,with notable differences in the vertical distribution of sulfates.This paper studies the vertical distribution of leachate,the physicochemical properties of waste,and the static distribution characteristics of sulfate reduction in two large landfills.The results show that the maximum concentration differences of SO_(4)^(2-)and S^(2-)within the two landfills reached 2562 mg·kg^(-1)and 544 mg·kg^(-1),respectively,with traces of sulfate reduction at all depths.In the non-leachate saturated zone,sulfur-containing compounds related to sulfate reduction hardly change with depth,while the degree of sulfate reduction in the leachate saturated zone is higher.Leachate saturation bands may occur at both the surface and bottom of landfills,with the highest moisture content reaching 42%,significantly affecting the physicochemical properties of the waste,and thereby indirectly affecting the sulfate reduction process.The migration and transformation patterns of SO_(4)^(2-)and TOC within each landfill are vastly different,resulting in significant differences in the vertical sulfate reduction process and making the production patterns of malodorous gases difficult to determine.This study analyzes the correlation between the sulfate reduction process in landfills and their internal environmental characteristics,which is helpful for the further prevention and control of malodorous gases.

关 键 词：填埋场 竖向分布 硫酸盐还原 静态表征 

分 类 号：X131[环境科学与工程—环境科学]