Abstract
A new electrochemical permeable reactive barrier (Electro-PRB) system for removal of hexavalent chromium [Cr(VI)] using Fe0 meshes was developed. Electro-PRB was found to be effective for electrochemical depassivation of Fe0 to remove Cr(VI) during treatment. During initial treatment, Cr(VI) removal rates decreased with time, due to loss of Fe0 reactivity by mineral fouling. After Fe0 was passivated, electrochemical depassivation was introduced for different electrolysis times to recover Fe0 reactivity. It was found that there was approximately 100.4–131.3% initial removal rate recovery, due to the electrochemical break down of precipitates on the Fe0 surfaces. During the treatment, the decreasing pH and increasing oxidation–reduction Potential (ORP) of the effluent implied the passivation of Fe0 surfaces. Scanning electron microscope analysis of acid-washed, electrochemically depassivated, and passivated Fe0 confirmed the efficiency of Elecro-PRB in the recovery Fe0 reactivity. The results indicate that the Electro-PRB system proposed here is capable of recovering the reactivity of Fe0, which may prolong the operation of Cr(VI) removal processes.
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