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Effect of Reagent Addition Order in Catalyzed H2O2 Propagations (CHP) Treatment Systems

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The advanced oxidation process Catalyzed H2O2 Propagations (CHP, or modified Fenton's reagent) uses transition metal catalysts and hydrogen peroxide (H2O2) to generate reactive oxygen species. Aqueous and simple heterogeneous systems were used to investigate the effect of reagent addition order in the effectiveness of CHP for the treatment of industrial waste streams and contaminated soils and groundwater. Several concentrations of H2O2 were used in the CHP reactions, and probe compounds were used to monitor the relative generation rates of the reactive oxygen species hydroxyl radical, superoxide anion, and hydroperoxide anion. Statistical analysis showed that for each system and for each reactive species, there was no difference between reactions in which iron (III) was added first and those in which H2O2 was added first. These results indicate that reagent addition order is not an important consideration in the process design for CHP treatment and remediation systems.

Document Type: Research Article

Affiliations: Department of Civil and Environmental Engineering, Washington State University, Pullman, WA 99164-2910 USA

Publication date: July 1, 2007

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