Abstract
This paper presents results from the first phase development of the H 2O 2 VisUV process for photo-oxidation of waterborne hazardous substances. The technology is generally applicable to numerous situations requiring removal of hazardous substances from: (a) groundwater; (b) drinking water; (c) chemical process water; (d) leakage contamination; and (e) wastewater. However, the first phase research focused attention on drinking water contaminants. The compounds investigated, C 1C 6, were: tetrachloromethane, tetrachloroethene, dichloroethane, dichloroethene, trichloroethane, trichloroethene and benzene. Dark (no VisUV) oxidation rates and photo-oxidation rates were determined; the latter rate constants were 10 4–10 5 greater than dark reaction values. The VisUV photons produce oxidizing free radicals from H 2O 2 and H 2O, and excited state species or free radicals from the reactant compound. The experimental work was conducted in a photochemical batch stirred tank reactor, with 100 W and 450 W mercury vapor lamps, covering the VisUV range, 578.0-222.4 nm. A mathematical model was used to analyze the results and obtain the rate constants. Also, the rate constants were successfully correlated by a molecular composition structure (MCS) model, which permits estimation of rate constants for other C 1C 6 chlorinated hydrocarbon compounds.
Published Version
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