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KMID : 0382420000260040029
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Korean Journal of Environmental Health Society
2000 Volume.26 No. 4 p.29 ~ p.37
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A Study on the Dye-Wastewater Treatment by Fenton and Photo-Fenton Oxidation Process
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Cho Il-Hyoung
Kho Young-Lim
Zoh Kyung-Duk
Lee Hong-Keun
Lee So-Jin
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Abstract
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Fenton´s oxidation process is one of the most commonly applied processes to the wastewater which cannot be treated by conventional biological treatment processes. However, it is necessary to minimize the cost of Fenton´s oxidation treatment by modifying the treatment processes or other means of chemical treatment. So, as a method for the chemical oxidation of biorefractory or nonbiodegradable organic pollutants, the Photo-Fenton-Reaction which utilizes iron(11)salt. H_2O_2 and UV-light simultaneously has been proprosed. Therfore, the purpose of this study is to test a removal efficiency of dye-wastewater and treatment cost with Fenton´s and Photo-Fenton´s oxidation process. The Fe(11)/H_2O_2 reagent is referred to as the fenton´s reagent. which produces hydroxy radicals by the interaction of Fe(11) with H_2O_2. In this experiment, the main results are as followed; 1. The Fenton oxidation was most efficient in the pH range of 3-5. The optimal condition for initial reaction pH was 3.5 for the high CODcr & TOC-removal efficiency. 2. The removal efficiency of TOC and CODcr increased up to the molar ratio between ferrate and hydrogen peroxide 0.2:1, but above that ratio removal efficiency hardly increased. 3. The highest removal efficiency of TOC and CODcr were showed when the mole ratio of ferrate to hydrogen peroxide was 0.2:3. 4. Without pretreatment process, photo-fenton oxidation which was not absorbed UV light was not different to fenton oxidation. 5. And Fenton oxidtion with pretreatment process was similar to Fenton oxidation in the absence of coagulation, the proper dosage of Fe^2+:H_2O_2 was 0.2:1 for the optimal removal efficiency of TOC or CODcr. 6. Also, TOC & CODcr removal efficiency in the photo-fenton oxidation with pretreatment was increased when UV light intensity enhanced. 7. Optimum light intensity in the range from 0 to 1200 W/㎡ showed that UV-intensity with 1200 W/㎡ was the optimum condition, when Fe^2+:H_2O_2 ratio for the highest decomposition was 0.2:2.5.
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