Potential for activated persulfate degradation of BTEX contamination

Water Research
Chenju LiangYan-Jyun Chen

Abstract

The present study focused on evaluation of activated persulfate (PS) anion (S(2)O(8)(2-)) oxidative degradation of benzene, toluene, ethylbenzene, and xylene (constituents of gasoline and known collectively as BTEX) contamination. The results indicated that BTEX were effectively oxidized by PS in aqueous and soil slurry systems at 20 degrees C. PS can be activated thermally, or chemically activated with Fe(2+) to form the sulfate radical (SO(4)(-)) with a redox potential of 2.4V. The degradation rate constants of BTEX were found to increase with increased persulfate concentrations. For two PS/BTEX molar ratios of 20/1 and 100/1 experiments, the observed aqueous phase BTEX degradation half-lives ranged from 3.0 to 23.1 days and 1.5 to 20.3 days in aqueous and soil slurry systems, respectively. In the interest of accelerating contaminant degradation, Fe(2+) and chelated Fe(2+) activated persulfate oxidations were investigated. For all iron activation experiments, BTEX and persulfate degradations appear to occur almost instantaneously and result in partial BTEX removals. It is speculated that the incomplete degradation reaction may be due to the cannibalization of SO(4)(-) in the presence of excess Fe(2+). Furthermore, the effects...Continue Reading

Citations

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