Development of new water treatment of compound pollutants by photo chemical reaction

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In this research, photolysis of some kinds of organohalogenides and agricultural chemicals were investigated as new water treatment. A xenon lamp was used for photocatalysis and medium and low pressure Ultraviolet lamp were used for single UV treatment.Some results were gotten as follows.1.Single UV treatment using two types of lampsOrganohalogenides which were used in this research can be decomposed by single treatment of both types of UV lamps, and the reactions conform the first order reaction. By germicidal intensity which was calculated using a bioindicator, the decomposition ratio by different types of UV lamp can be compared. According to this methods, the compounds which have carbon double bond (C=C) was decomposed by medium pressure UV lamp faster than low pressure lamp. The compounds which have carbon bomine bond (C-Br) was decomposed easily by both lamps.2.Photocatalysis of chemical compounds in aqueous TiO2 suspensionsphotocatalitic degradation of the some kinds of aromatic compounds such as Thiobencarb, monochlorobenzene was studied in aqueous TiO2 suspensions with a simulated sunlight, xenon light. All these compounds were mineralized completely to carbon dioxide, and during the time-course of TOC,pH and Anion were consistent. There were clear differences in the pH change and the time required for disappearance and mineralization between these compounds.