Chemical Regeneration of Manganese Oxide-Coated Sand for Oxidation of Organic Stormwater Contaminants

Environmental Science & Technology
Joseph A CharbonnetDavid L Sedlak

Abstract

Urban stormwater, municipal wastewater effluent, and agricultural runoff contain trace amounts of organic contaminants that can compromise water quality. To provide a passive, low-cost means of oxidizing substituted phenols, aromatic amines, and other electron-rich organic compounds during infiltration of contaminated waters, we coated sand with manganese oxide using a new approach involving the room-temperature oxidation of Mn2+ with permanganate. Manganese oxide-coated sand effectively oxidized bisphenol A under typical infiltration conditions and sustained reactivity longer than previously described geomedia. Because geomedia reactivity decreased after extended operation, chlorine was evaluated for use as an in situ geomedia regenerant. Geomedia regenerated by HOCl demonstrated similar reactivity and longevity to that of virgin geomedia. Chemical analyses indicated that the average manganese oxidation state of the coatings decreased as the geomedia passivated. X-ray absorption spectroscopy and X-ray diffraction showed that the reactive virgin and regenerated geomedia coatings had nanocrystalline manganese oxide structures, whereas the failed geomedia coating exhibited greater crystallinity and resembled cryptomelane. These r...Continue Reading

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Citations

Dec 14, 2018·Environmental Science. Processes & Impacts·Sarah BalgooyenMatthew Ginder-Vogel
Jan 19, 2021·Journal of Environmental Quality·Sarah BalgooyenMatthew Ginder-Vogel
Mar 23, 2021·Environmental Science & Technology·Joseph A CharbonnetDavid L Sedlak
Aug 11, 2020·Water Research·Zi Ye, Valentina Prigiobbe
May 30, 2020·Environmental Science & Technology·Rasesh PokharelKhalil Hanna
Aug 23, 2021·Journal of Hazardous Materials·Basanta Kumar BiswalRajasekhar Balasubramanian

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