铁屑耦合生物麦饭石的PRB系统修复含铬酸根与硝酸根地下水

针对污染地下水中铬酸根和硝酸根迁移速度快,可渗透反应墙(PRB)常规活性材料修复效果差等问题,以铁屑、麦饭石和硫酸盐还原菌(SRB)为活性材料,构建4组耦合PRB动态柱修复地下水中Cr(Ⅵ)和NO3--N。结果表明,4#(铁屑、麦饭石和SRB)柱修复效果较1#(麦饭石)、2#(铁屑、麦饭石)和3#(麦饭石和SRB)柱好,且稳定,对Cr(Ⅵ)和NO3--N平均去除率分别是97.7%和97.34%,可见,以铁屑、麦饭石和硫酸盐还原菌为活性材料的耦合PRB系统修复地下水中Cr(Ⅵ)和NO3--N具有有效性与可行性。

PRB system of iron coupling with biological medical stone for repairing groundwater containing chromium and nitrate

Aiming at the problem of the fast migration speed of chromium and nitrate in polluted groundwater and the low efficiency of treating with conventional activity materials of permeable reactive barrier (PRB),with iron,medical stone,sulfate-reducing bacteria (SRB) as active materials,4 groups of PRB columns of coupling system were built to deal with chromium and nitrate in groundwater.The results showed that Column 4(iron,medical stone and SRB) is obviously better than Column 1(medical stone),Column 2(iron,medical stone),Column 3(medical stone,SRB),which has the average removal rates of 97.7% and 97.34% on Cr (Ⅵ) and NO3--N.It is obvious that the coupling system of PRB with iron,medical stone and SRB is effective and feasible for repairing Cr (Ⅵ) and NO3--N in groundwater.