垃圾渗滤液污染晕中污染物的衰减规律研究

通过实验室土柱模拟实验,研究垃圾渗滤液污染晕中不同污染物在空间和时间上的迁移转化规律和生物地球化学作用机理。实验结果表明:渗滤液污染晕中,TOC浓度随距离增加而降低,其初期去除率为99.87%。随着时间的延长,TOC浓度升高,末期去除率仅为55.21%,而且其在地下环境中的迁移能力较强;铵氮空间上的变化规律在初期与TOC相似,其去除率达99.58%,但后期其浓度随距离的增加呈先升高后降低的变化趋势。随着时间的延长,铵氮浓度不断升高,但其迁移能力不及TOC,末期去除率仍高达90.21%。

Study on Contaminants Attenuation Rule of Landfill Leachate in Pollution Plume

A soil column is constructed to investigate temporal and spatial transportation and transformation rule of landfill leachate pollutants in pollution plume,and to study the biogeochemistry(mechanisms) of the pollutants attenuation in the landfill leachate plumes.Experimental results indicated that in the pollution plume of landfill leachate,the concentration of TOC decreased with the distance,and its removal efficiency was up to 99.87% in the initial phase.The concentration of TOC increased with time and its removal efficiency in the final phase is only 55.21%.TOC is easy to transport.The spatial change of ammonium was familiar with that of TOC in the initial phase;its removal efficiency could be up to 99.58%.However,in the final phase,the concentration of ammonium increased first and then declined with the distance.The concentration of ammonium increased with time,but its transport ability is less than that of TOC. The removal efficiency of ammonium in the final phase reached 90.12%.