铁屑强化麦饭石修复地下水中阴离子试验研究

摘要

针对地下水中阴离子Cr(Ⅵ)、NO3-难以利用一种可渗透反应墙(PRB)活性材料有效修复的问题，构建铁屑强化麦饭石PRB修复系统去除地下水中Cr(Ⅵ)和NO3-的试验模型。结果表明，铁屑强化麦饭石2#（麦饭石与铁屑按1∶2分层）和3#（麦饭石与铁屑按1∶2混合）柱对Cr(Ⅵ)和NO3-的去除率较1#（麦饭石）柱提高6~8倍，3#柱去除效果最好且稳定，对Cr(Ⅵ)和NO3-的平均去除率分别为97.7%和94.09%，出水质量浓度分别小于0.23 mg/L、1.18 mg/L。由此可见，铁屑强化麦饭石PRB系统修复地下水中Cr(Ⅵ)和NO3-污染物是可行和有效的。%According to the problem that anions such as chromium and nitrate from groundwater can’t be effectively removed by only one active material in PRB. The repair text of chromium and nitrate was built by medical stone strengthened by iron iflings of PRB. The results showed that the removal rate of column 2(medical stone:iron ifling=1∶2, layered) and column 3 (medical stone:iron ifling=1∶2, mixed) strengthened by iron ifling was better than column 1(medical stone) 6~8 times. The removal rate of column 3 was good and stable, Cr(Ⅵ) and NO3-can be removed by 97.7%and 94.09%respectively. The eflfuent concentration of Cr(VI) and NO3-was less than 0.23mg/L and 1.18mg/L.Therefore, the system of PRB with medical stone strengthened by iron ifling is feasible and effective for repairing Cr(Ⅵ) and NO3-in groundwater.