受污染地下水可渗透反应墙修复技术研究

Study on the Reaction Media of PRB Technology in the Remediation of Polluted Groundwater

以垃圾渗滤液污染的地下水为研究对象,分别用铁粉、沸石和活性炭及其混合物为反应介质,设计了5种不同介质及配比的PRB反应器,进行了实验室模拟研究。结果表明,以铁粉和活性炭为介质的2种反应器,对COD的去除率分别平均达到89%和90%;以铁粉和沸石为介质的2种反应器,对氨氮的去除率都达到90%以上,在反应器中沸石含量相同的情况下,Fe0含量越高对氨氮的处理效果越好;活性炭与铁粉的比例较高的反应器,对氨氮的去除率也达到90%;以铁粉和活性炭为反应介质的反应器对总磷的去除率也达到85%以上。

Three reaction media(zero valent iron,activated carbon and zeolite) were used to design five kinds of permeable reactive barriers(PRB) to study the feasibility and the efficiency of the PRB technology in the remediation of leachate-polluted groundwater.The designs of the reactors considered the relation of the permeability of the reactor and the permeability of the aquifer.The result indicated that the COD removal rates in the two reactors with zero valent iron and activated carbon were 89% and 90% respectively,the removal of ammonium in reactors with zero valent iron and zeolite were over 90%,and in the reactors with zero valent iron and zeolite,the removal rates of ammonium was higher under higher ratio of zero valent iron.The removal rate of total phosphorus in the reactors with zero valent iron and activated carbon was over 85%.These results indicated that PRB technology was an efficient method for the treatment of leachate-polluted groundwater and that different reaction media and their ratios had great influence on the efficiency of PRB technology.