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复配介质去除地下水中腐殖酸

Keywords: 复配介质,腐殖酸,地下水,PRB

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Abstract:

以模拟地下水为研究对象，进行了复配介质去除地下水中腐殖酸的实验研究。探讨了配比、粒径、固液比、pH和温度对腐殖酸去除效果的影响。腐殖酸的浓度通过紫外分光光度法测定。结果表明：在不加活性炭的条件下，H物质∶X物质∶Q物质=1∶8∶8时，其硬度较好；在初始pH=6.34、反应时间为4h时，去除率可达到95%以上；当反应时间≤1h时，去除率随粒径增大而减小，而当反应时间为2～6h时，小粒径和中等粒径复配介质对腐殖酸去除率略高于大粒径；一定浓度范围内，腐殖酸的去除率与固液比呈正相关，但固液比增大时，并不能无限提高去除率，当固液比为1∶200～1∶50时，去除率呈现平台；pH对复配介质去除效果影响不大，而温度对腐殖酸的去除有显著影响，较低温度（16.8℃）下的去除率比较高温度（35.0℃）下的去除率高5%。该复配介质去除地下水中腐殖酸是有效可行的，可作为PRB（permeablereactivebarrier，渗透反应格栅）的潜在反应介质。

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