Abstract
AbstractThe primary goal of this study was to investigate the influence of permanganate (MnO4−) on the performance of granular iron permeable reactive barriers. The degradation of trichloroethene (TCE) was measured initially and then over time as a MnO4− solution was passed through laboratory columns packed with granular iron. Concentration profiles for MnO4−, TCE, and degradation products (dichloroethene isomers and vinyl chloride), as well as pH, were observed. The pH increased sharply after passing MnO4− through the column, from ~8 to 11. MnO4− rapidly oxidized the granular iron and formed insoluble precipitates and oxide films or coatings on the granular iron surfaces. The precipitates did not accumulate in sufficient quantity to cause a measurable decline in hydraulic conductivity; however, the surface films formed as a consequence of the addition of MnO4− caused the iron to become nonreactive with respect to both MnO4− and TCE.
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