不同土质中垃圾填埋场渗滤液的迁移转化规律

Migration and transformation of landfill leachate in different soil

通过在多种土柱中进行对比试验,研究了卫生填埋场渗滤液主要污染组分TOC及总氮在不同土壤组成条件下的迁移转化规律。试验结果表明,咸水与淡水相比较,地下环境中TOC及总氮的衰减率会受到咸水的阻碍作用;砂土土质与细砂土质相比较,TOC及总氮在砂土土质中的衰减显著大于细砂土质中的衰减。内陆垃圾卫生填埋场大多为淡水、砂土土质,而海滨垃圾卫生填埋场大多为咸水、细砂土质,前者对渗滤液污染物的去除具有更加显著的效果。

In this paper,the migration and transformation rules of TOC and total nitrogen,the main pollution components of leachate in sanitary landfill sites,under different soil composition conditions were studied through comparative tests in a variety of soil columns.The results show that the attenuation rate of TOC and total nitrogen in the underground environment is hindered by salt water.Compared with fine sand soil,the attenuation of TOC and total nitrogen in sandy soil is significantly greater than that in fine sand soil.Inland sanitary landfills are mostly fresh water and sandy soil,while coastal sanitary landfills are mostly salt water and fine sand soil.The former has a more significant effect on the removal of leachate pollutants.