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The Feasibility Study of Persulfate Oxidation to Regenerating of Spent Granular Activated Carbon
Citation:
Ko, S., S. Park, S. G. HULING, AND E. Kan. The Feasibility Study of Persulfate Oxidation to Regenerating of Spent Granular Activated Carbon . Presented at The 7th IWA Leading-Edge Conference on Water and Wastewater Technologies, Phoenix, AZ, June 02 - 04, 2010.
Impact/Purpose:
The goal of this study was to identify optimal conditions for persulfate-driven oxidation of Methyl tert-butyl Ether (MTBE)-spent GAC.
Description:
Chemical oxidation is a developing technology used to regenerate contaminant-spent GAC. Chemical regeneration of GAC represents a viable option to thermal regeneration methods that are energy intensive resulting in significant consumption of fossil fuels and production of greenhouse gases. The goal of this study was to identify optimal conditions for persulfate-driven oxidation of Methyl tert-butyl Ether (MTBE)-spent GAC. Process optimization results were subsequently used to assess the potential feasibility of regenerating chloroform (CF)-spent F400 GAC, which was produced at a water treatment facility resulting from the chlorination of natural organic matter rich water. Thermal activation of persulfate at the highest temperature (55 °C) was the most efficient method to oxidize MTBE. Optimization results suggest the rate-limiting step is partially attributed to mass transfer and transport of MTBE and persulfate. Comparatively, thermally-activate persulfate oxidation of CF-spent GAC was less effective. When CF was amended to another GAC (URV), a significant improvement in CF removal was measured. It is proposed that differences in the physical and chemical characteristics of GAC played a role in this result.
