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表面活性剂冲洗修复多氯联苯污染土壤多相流研究

Keywords: 多氯联苯,表面活性剂,网络模型,毛细压力,相对渗透率

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Abstract:

多氯联苯(PCBs)是一种具有持久性、抗生物降解性、脂肪溶性和明显的生物毒性等特性的持久性有机污染物,PCBs在土壤中难于准确定位、难被分解和强烈吸附,去除土壤中PCBs比较困难。表面活性剂冲洗法可以通过提高PCBs溶解度和降低水PCBs界面张力来实现PCBs从土壤中去除;表面活性剂冲洗PCBs污染土壤涉及气相、水相、NAPLs相和固相等物质,是多相共存并相互发生作用的过程,发生相对渗透率、饱和度和毛细压力的变化;另外,为研究表面活性剂冲洗土壤中PCBs的去除机理,并降低PCBs对研究人员的危害,采用微观孔隙结构网络模型是一种较新颖的和效果显著的研究方法。开展表面活性剂冲洗PCBs污染土壤多相流研究,可以为PCBs污染场地修复提供理论基础和实验支持,并促进我国POPs履约工作的顺利进行。

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