Removal of Color and COD from Dyestuff Industry with Continuous-photocatalytic Reactor

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Thammasak Rojviroon
Sanya Sirivithayapakorn
Orawan Rojviroon


This research prepared a TiO2 thin film photocatalyst for photocatalytic process. The removal efficiency of color and COD from dyestuff industry were examined in a continuous-photocatalytic reactor under sunlight as solar irradiation. The wastewater used in this research for photocatalytic performance test comprised of pre- and post-treatment wastewater from the wastewater treatment plant with activated sludge treatment process of dyestuff industry. The results show that the use of prepared TiO2 photocatalyst in photocatalytic processes can remove color and COD in pre- and post-treatment wastewater with the maximum efficiency of color and COD removal of 39.85% and 45.23%, respectively for pre-treatment wastewater and with the maximum efficiency of 28.21% and 44.41%, respectively for post-treatment wastewater, after 300 minutes treatment. The kinetics of COD removal by photocatalytic process based on the results of this study can be explained by the first-order reaction equation. The calculated first-order reaction constant was 0.0121 min-1 and 0.0107 min-1, respectively for pre- and post-treatment wastewater from the wastewater treatment plant of dyestuff industry.

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Rojviroon, T. ., Sirivithayapakorn, . S. ., & Rojviroon, O. . (2019). Removal of Color and COD from Dyestuff Industry with Continuous-photocatalytic Reactor. Journal of Engineering, RMUTT, 17(1), 41–54. Retrieved from
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