The Study On Transportation Of Phthalate Acid Esters In Vadose Zone Of Landfill

Phthalic acid ester (PAEs) is a important compounds of Environmental Estrogens ,which will lead physical deformities, endocrinopathy, reproductive harm such as system lesions. Landfill is one of the important source of PAEs inflow into environment. Research on migration transformation of PAEs in landfill vadose zone, mathematical modeling and its influence on the full hosepipe groundwater t is an important subject of environment science.This study choose Li keng landfill in Guangzhou as the example. Through the waste degradation test and static adsorption, degradation and dispersion experiment of vadose soil, six components of PAEs (DBP,DMP,DBP,BBP,DnOP,DEHP) degradation rule in landfill leachate and its migration transformation in vadose zone were researched. We got the degradation parameter of PAEs in garbage, adsorption, degradation, dispersion characteristics parameters of PAEs in landfill vadose zone. The degradation of PAEs in landfill leachate and the migration in vadose zone were coupled as a vadose groundwater pollution system, the migration of PAEs in the system were integrated into mathematical model. And then, the mathematical model was used to predict the migration of PAEs in landfill leachate from the sealed landfill area in vadose soil. It had been showed that: if considering the vadose adsorption and degradation of soil , distance of DMP migration in vadose was the farthest (6.5 m), more than the mutagenicity of groundwater level (3m), will pollute groundwater of saturation zone, and other PAEs migration distance were short, less than 1.5 m, won't have influence on the full hosepipe groundwater; only consider degradation does not consider the circumstances, besides DnOP , other five kinds of PAEs were exceeded pollution limits.