Chemical reduction of HCH in groundwater
2008
Pijls, Ch. | Volkering, F.
The effectiveness of treatment of HCH contaminated groundwater by chemical reduction with Zero Valent Iron (ZVI) was investigated in a laboratory study. Results were compared with the effectiveness of anaerobic biodegradation of HCH. Of three different types of ZVI tested to determine the effectiveness of chemical reduction of the HCH isomers in groundwater (granular ZVI, fine ZVI, and nanoscale ZVI) granular and fine ZVI were most effective. The batch tests have shown that ZVI can bring about a fast reduction of HCH to almost exclusively benzene. Using the aqueous phase data from the batch tests, an average half-life of 0.46 day can be estimated for total HCH. Furthermore considerable adsorption of HCH on iron was observed. Granular ZVI was selected for testing in column experiments. After 110 days and 62 pore volumes of flushing, the HCH level was still below the detection limit (0,01 mu/L) and benzene was present in a concentration of 2 mu/L, accounting for only 7.5 percent of the HCH in the influent. Adsorption to the solid phase will have influenced the effluent levels of HCH and degradation products in both the biological and the chemical experiments. The anaerobic biodegradation experiments demonstrated treatment efficiencies of more than 95 percent at retention times of 2,5 days.
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