| Summary: | 碩士 === 崑山科技大學 === 環境工程研究所 === 103 === The ozone process was used in the present study to treat the electroplating and dyeing wastewater in the south. Batch experiments were initially conducted for the feasibility study of conducting ozonolys is for COD in wastewater of various industries. Under fixed ozone dosage, identical operation water quantity, and various operation time, the initial pH value, manganese dioxide (catalyst) quantity, and sodium chlorate quantity were adjusted to investigate the decomposition of COD by the reaction with ozone in wastewater of various industries.
The experimental results indicated that, for wastewater following chemical treatment from electroplating factory A, and that following biological treatment from dyeing factory C, the optimal parameters after ozone and sodium chlorate were found to be 10 and 5 g of sodium chlorate, respectively. Moreover, when the pH value was fixed, COD was reduced to be below 100 mg/L meeting the effluent regulation following 3 hours of ozone and sodium chlorate oxidation, with are removal rate near 90%. In the continuous flow test of a small volume of water, the most favorable effluent COD balanced concentration was achieved within 6 hours of HRT. However, if the effluent was to be stably controlled under the effluent standard, the HRT was found to be optimal at 3-6 hours. For colored wastewater (electroplating and dyeing water from factory B and dyeing wastewater from factory C), the color removal by ozone technology was found to be excellent, meeting the effluent standard of 550 after ozone oxidation for approximately 1 hour.
In terms of economical assessment, for the wastewater from chemical treatment from factory A based on the operation of conventional activated carbon, the cost per day was approximately NT$7,840, and the cost for the removal of 1 kg of COD was NT$653. For the assessment of using ozone and sodium chlorate of the present study, the operation cost per day was approximately NT$5,840, and the cost for the removal of 1 kg of COD was around NT$372. That is, when the conventional activated carbon was replaced by the ozone technology, approximately NT$700,000 could be saved per year (based on the wastewater of 20CMD).
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