A Laboratory Column Investigation for the Treatment of Cr(VI) with Zero-Valent Iron

Permeable reactive barrier (PRB) technology is commonly placed in the list of options for groundwater remediation at hazardous waste sites, where Cr(VI) treatment in groundwater has been a concern more than any other inorganic contaminants. The objective of this study was to investigate the effectiveness and longevity of Cr(VI) removal with zero-valent iron based PRBs. The main focus was on two parameters affecting the performance of Cr(VI) removal with PRBs: (1) amount of reactive media and (2) groundwater flux. Laboratory scale columns packed with different amounts of iron powder and quartz sand mixture were fed with an aqueous solution containing 20 mg/L chromium under different groundwater fluxes. When chromium treatment efficiencies of the columns were compared with respect to iron powder/quartz sand ratio, the amount of iron powder was found to be an important parameter for treatment efficiency of PRBs. When the same experiments were conducted at higher fluxes, an increase was observed in the treatm...

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