重非水相流体在砂壤中驱替与残留试验研究  

Experimental Study on the Displacement and Residual of Dense Non-aqueous Phase Liquid in Sandy Loam

作　　者：王锐[1] 张富仓[2] 王国栋[2] 陈艳丽[1] 

机构地区：[1]河南理工大学,河南焦作454000 [2]西北农林科技大学旱区农业水土工程教育部重点实验室,陕西杨凌712100

出　　处：《水土保持学报》2009年第6期207-209,219,共4页Journal of Soil and Water Conservation

基　　金：国家自然科学基金项目(50579066);河南理工大学博士基金(B2009-62)

摘　　要：通过对PCE在砂壤土中的入渗再分布以及水分驱替和残留的试验研究,结果表明:PCE在砂壤中的入渗与再分布深度和时间的关系可以很好地用对数函数来描述。水分驱替后被置换区域土壤内PCE的饱和度明显降低,向下迁移并累积,达到一定含量后,PCE向下运动锋面速率增大。被水置换后,PCE在土体内将残留一小部分,残留饱和度为4%～15%,多小于10%,随着容重增大残留量将增加。残留的PCE在土体中缓慢溶解,随水分类似于溶解的溶质进行对流和扩散,向上可能到达地表,挥发进入大气;向下则可能进入地下水体,成为长期的潜在污染源。The experiments were conducted to study the infiltration and redistribution of PCE,water-PCE displacement and residual PCE saturation in the sandy loam. The results showed that： the infiltration and redistribution depth and time can be well fitted in logarithmic function. PCE saturation decreases significantly after displaced by water,and PCE migrates downward and accumulates,when PCE amounts to a certain content,the PCE infiltration front moves downward at a higher rate. The residual PCE saturation in sandy loam under two bulk density of 1.30 g/cm3 and 1.40 g/cm3 are about 4%~15%,most are less than 10%,with higher residual PCE saturation under bigger soil bulk density. Part of the residual PCE in the soil will dissolve slowly and migrate by the way of convection or diffusion,which maybe reach the surface and volatile into the atmosphere,or migrate downwards into the groundwater and become the potential long-term pollution sources.

关 键 词：重非水相流体 运移 砂壤土 

分 类 号：S152[农业科学—土壤学] S152.7[农业科学—农业基础科学]