Electrochemical depassivation for recovering Fe0 reactivity by Cr(VI) removal with a permeable reactive barrier system

► A new electrochemical permeable reactive barrier system for removal of Cr(VI) was developed. ► Electro-PRB was found to be effective for depassivation of Fe0 to remove Cr(VI) during treatment. ► After depassivation, 100.4-131.3% initial removal rate recovery was achieved.