堆肥 + 零价铁可渗透反应墙修复黄土高原地下水中铬铅复合污染简

为了研究堆肥+零价铁混合可渗透反应墙（PRB）修复黄土高原地下水中铬铅复合污染的可行性，分别用堆肥、零价铁、堆肥+ 零价铁、堆肥+ 零价铁+活性炭为反应介质，通过模拟柱实验考察PRB修复铬铅复合污染黄土高原地下水的效果。结果表明，在实验进行30 d后当反应柱1和2对六价铬的去除率接近于零，而且对二价铅的去除率迅速下降时，反应柱3对2种污染物仍保持较高的去除率；反应介质质量比为10：2：1的反应柱4和质量比为10：1：2的反应柱5对污染物的去除效果均优于质量比为10：1：1的反应柱3；反应50 d后，添加活性炭的反应柱6对2种污染物的去除率仍在90%。这说明使用堆肥+零价铁混合可渗透反应墙修复黄土高原地下水中铬铅复合污染是可行的；且以堆肥+零价铁作为介质的反应柱去除效果优于单独以堆肥或铁粉为介质的反应柱；增加铁粉或堆肥的用量有利于铬铅复合污染的去除；且同时添加活性炭更有助于污染物的去除。

Remediation of Cr-Pb polluted groundwater using a mixed zero-valent iron-compost permeable reactive barrier in Loess Plateau aera

In order to demonstrate the feasibility of Cr-Pb co-polluted groundwater in situ remediation by (permeable reactive barrier,PRB) based on (zero-valent iron,ZVI)-compost media in the Loess Plateau aera, a series of columns test were conducted with compost, ZVI, ZVI-Compost and ZVI-compost-active carbon as the reactive media respectively. The results showed the removal rate of Cr and Pb by column 1 or column 2 rapid declined after 30 days. But the removal rate of Cr and Pb by column 3 retained higher rate after 30 days.The removal effects of column 4(10:2:1) and column 5(10:1:2) are bettter than column 3(10:1:1). The removal rate of two pollutants of column 6 retained over 90%. So it indicates that the reactor packed with ZVI-compost had a better performance than the reactor packed with compost or ZVI alone. It increased significantly the removal efficiency of target contaminants with increasing the amount of compost and ZVI. Moreover, it could also be increased by adding active carbon. The PRB with ZVI-compost as the reaction media is a potential method for Cr-Pb removal from groundwater.