铬污染地下水的PRB修复试验

以铬污染地下水为研究对象,分别用活性炭、零价铁、活性炭+零价铁作为反应介质,设计了渗透反应隔栅(PRB),对PRB治理六价铬污染地下水的可行性和有效性进行了试验研究,试验结果表明,活性炭对Cr(VI)有一定的吸附作用,零价铁对Cr(VI)有较强的还原作用,零价铁与活性炭配合作用时,二者的配比影响Cr(VI)的去除,零价铁所占质量分数越大,去除效果越好。零价铁、活性炭和石英砂质量分数分别为40%,4%和2%时,可以使Cr(VI)的质量浓度从100mg/L降低到0.05mg/L以下,达到《饮用净水水质标准》。采用PRB技术治理Cr(VI)污染地下水是可行的。

A PRB Remediation Test of Cr-polluted Groundwater

With Cr-polluted groundwater as the research subject, permeation reaction barriers (PRB) were designed with active carbon, Fe0, and active carbon plus Fe0 as reaction media respectively, with which the feasibility and effectiveness of the treatment of Cr-polluted groundwater by PRB were tested and studied. The results of the test show that active carbon has a certain adsorptive effect on Cr(VI) and Fe0 has a stronger reductive effect on Cr(VI); when Fe0 and active carbon act in combination, the proportioning of the two affects the removal rate ofCr(VI), i.e., the larger the mass fraction of Fe0 is, the better the removal effect will be. When the mass fractions of Fe0, active carbon and quartz sand are 40%, 4% and 2% respectively, the mass concentration of Cr(VI) can be reduced from 100 mg/L to 0.05 mg/L or below, which meets the requirement of water quality standard for fing drinking water. The result of the test shows that the use of the PRB technology in the treatment of Cr(VI)-polluted groundwater is feasible.