用双层PRB技术处理垃圾填埋场地下水污染的可行性研究

The feasibility study of using double layer PRB technology in remediation of groundwater pollution in landfill site

设计了双层结构可渗透反应屏障(PRB),对渗滤液污染地下水原位处理的可行性进行实验研究.其中,第一反应器主要填充了零价铁,对复杂的不可生物降解和难生物降解的卤代烃等有机物进行分解;第二反应器主要填充了释氧剂(ORC),对有机物进行彻底的处理.实验结果表明:经过第一反应器后BOD5 COD值由0 32升高至0 75,铵离子和硝酸根离子的去除率分别达到85%和80%;ORC反应器最大释氧量为7 64mg·L-1.采用双层PRB结构治理渗滤液污染地下水是可行的.

A double layer Permeable Reactive Barrier (PRB) experiment was designed to study the feasibility of in-situ remediation of groundwater contaminated by landfill leachate. Zero valent iron (ZVI) was used in the first reactor as fillings to decompose complex non-degradable and less degradable organics such as halocarbon. Then the second reactor was used to treat organic compound completely. It was an ORC reactor filled with Oxygen Release Compounds. The results indicated that the value BOD_5/COD increased from 0.32 to 0.75 after through the first reactor. The removal ratio of ammonium and nitrate went up to 85% and 80%, respectively; and the maximum concentration of dissolved oxygen (DO)released by the ORC reactor went up to 7.64?mg·L^(-1). Hence, a double layer PRB to treat leachate-polluted groundwater is feasible to application.