| Summary: | 碩士 === 朝陽科技大學 === 環境工程與管理系碩士班 === 98 === The paper and pulp industry utilizes a high quantity of water in production process, and produce equally large amounts of waste water, which constitutes one of the major sources of water pollution. A lot of suspended solids, high concentration of organic matter and complex chemicals present in this wastewater leading to the water quality characteristics of wastewater of high COD. Advanced oxidation processes (AOP) have the advantage that they can conversion of organic pollutants to short species and even to their complete mineralization. In this study batch experiments were conducted to asses the efficiency of δ-MnO2 and TiO2 for degradation of organic pollutants in wastewater. The effects of various parameters on degradation of organic pollutants include catalyst type, catalyst dosage, pH value, irradiation with light or not were investigated. Further, the photo catalytic mechanism of reaction was also evaluated. The results showed that the reduction of COD was higher with irradiation of light than with out irradiation of light and δ-MnO2 shows good efficiency compared to that TiO2. The wastewater pH lowering to pH 5.0, the COD reduction rate was higher compare with the pH values 7 and 9, but that pH can not meet with effluent standards. The experiments demonstrated that the maximum reduction of COD occurred with dosage of 0.1% δ-MnO2 and same reduction results were observed with irradiation UV light and sunlight. It was thus suggested that the reduction of COD with irradiation of sunlight is a feasible technology over UV light irradiation. In order to simulate for maximum degradation of organic pollutants in real situations the needed optimal requirements are 0.1% δ-MnO2 with irradiation of sunlight.
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