title: Oxidation of organic contaminants by manganese oxide geomedia for passive urban stormwater treatment systems.
abstract: To advance cost-effective strategies for removing trace organic contaminants from urban runoff, the feasibility of using manganese oxides as a geomedia amendment in engineered stormwater infiltration systems to oxidize organic contaminants was evaluated. Ten representative organic chemicals that have previously been detected in urban stormwater were evaluated for reactivity in batch experiments with birnessite. With respect to reactivity, contaminants could be classified as: highly reactive (e.g., bisphenol A), moderately reactive (e.g., diuron) and unreactive (e.g., tris(2-chloro-1-propyl)phosphate). Bisphenol A and diuron reacted with birnessite to produce a suite of products, including ring-cleavage products for bisphenol A and partially dechlorinated products for diuron. Columns packed with manganese oxide-coated sand were used evaluate design parameters for an engineered infiltration system, including necessary contact times for effective treatment, as well as the impacts of stormwater matrix variables, such as solution pH, concentration of natural organic matter and major anions and cations. The manganese oxide geomedia exhibited decreased reactivity when organic contaminants were oxidized, especially in the presence of divalent cations, bicarbonate, and natural organic matter. Under typical conditions, the manganese oxides are expected to retain their reactivity for 25 years.
authors.affiliation: National Science Foundation Engineering Research Center for Reinventing the Nation's Urban Water Infrastructure (ReNUWIt), Department of Civil & Environmental Engineering, University of California, Berkeley, CA, USA.
authors.forename: Janel E
authors.initials: JE
authors.lastname: Grebel
authors.affiliation: National Science Foundation Engineering Research Center for Reinventing the Nation's Urban Water Infrastructure (ReNUWIt), Department of Civil & Environmental Engineering, University of California, Berkeley, CA, USA.
authors.forename: Joseph A
authors.initials: JA
authors.lastname: Charbonnet
authors.affiliation: National Science Foundation Engineering Research Center for Reinventing the Nation's Urban Water Infrastructure (ReNUWIt), Department of Civil & Environmental Engineering, University of California, Berkeley, CA, USA. Electronic address: sedlak@berkeley.edu.
authors.forename: David L
authors.initials: DL
authors.lastname: Sedlak
mesh_terms: D001559:Benzhydryl Compounds / Q000737:chemistry*; D004237:Diuron / Q000737:chemistry*; D004968:Estrogens, Non-Steroidal / Q000737:chemistry; D005411:Flame Retardants; D006540:Herbicides / Q000737:chemistry; D010755:Organophosphates / Q000737:chemistry*; D010084:Oxidation-Reduction; D010087:Oxides / Q000737:chemistry*; D010636:Phenols / Q000737:chemistry*; D014874:Water Pollutants, Chemical / Q000737:chemistry*; D018508:Water Purification / Q000379:methods*; D000098826:Bisphenol A Compounds
chemical_list: D001559:Benzhydryl Compounds; D004237:Diuron; D004968:Estrogens, Non-Steroidal; D005411:Flame Retardants; D006540:Herbicides; D010755:Organophosphates; D010087:Oxides; D010636:Phenols; D014874:Water Pollutants, Chemical; C505018:birnessite; C034906:Fyrol PCF; C006780:bisphenol A; D000098826:Bisphenol A Compounds
keywords: Aquifer recharge; Bioinfiltration; Low impact development (LID); Reactive media