Modular Advanced Oxidation Process Enabled by Cathodic Hydrogen Peroxide Production
By Barazesh, James M.; Hennebel, Tom; Jasper, Justin T. & Sedlak, David L.
Published in Environmental Science \& Technology
NULL
2015
Abstract
Hydrogen peroxide (H?o?) is frequently used in combination with ultraviolet (UV) light to treat trace organic contaminants in advanced oxidation processes (AOPs). In small-scale applications, such as wellhead and point-of-entry water treatment systems, the need to maintain a stock solution of concentrated H?o? increases the operational cost and complicates the operation of AOPs. To avoid the need for replenishing a stock solution of H?o?, a gas diffusion electrode was used to generate low concentrations of H?o? directly in the water prior to its exposure to UV light. Following the AOP, the solution was passed through an anodic chamber to lower the solution pH and remove the residual H?o?. The effectiveness of the technology was evaluated using a suite of trace contaminants that spanned a range of reactivity with UV light and hydroxyl radical (HO•) in three different types of source waters (i.e., simulated groundwater, simulated surface water, and municipal wastewater effluent) as well as a sodi
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