Study on PRB Remediation of Groundwater Polluted by Chromium

In this paper,zero valent iron and activated carbon were used to design permeable reactive barrier(PRB) to study the feasibility and the efficiency of PRB technology in the remediation of chromium-polluted groundwater.The results showed that activated carbon absorbed some chromium,zero valent iron strongly reduced Cr(Ⅵ),and the synergic effects can improve the remediation capacity of Fe0 PRB,Cr(Ⅵ) decreased from 100 mg/L to less than 0.05 mg/L,which meets the water quality standard for drinking water.Dynamic PRB flushing experiments showed that the Cr3+ generated from Cr6+ were reduced to form Cr(OH)3 and precipitated other than transported to the downstream water body.Based on the lab experimental results,it is feasible to remediate Cr(Ⅵ)polluted groundwater by Fe0 PRB.