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Environmental Engineering Research 2004;9(6): 279-287. DOI: https://doi.org/10.4491/eer.2004.9.6.279
A STUDY ON ELECTROCHEMICAL OXIDATION OF CATECHOL IN CHLORIDE MEDIUM FOR WASTEWATER TREATMENT APPLICATION
D. Rajkumar1, Jong-Guk Kim1, and Kyeo Keun Kim2
1Research Institute of Industrial Technology, Chonbuk National University, Chonju 561-756, Korea
2Department of Environmental Engineering, Chongju University, Naedok-dong, Chongju 360-746, Korea
Corresponding Author: Jong-Guk Kim ,Tel: +82-63-270-2448, Fax: +82-63-279-2449, Email: kjongguk@moak.chonbuk.ac.kr
Received: July 24, 2004;  Accepted: December 20, 2004.
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ABSTRACT
This paper presents the results of electrochemical oxidation of catechol for wastewater treatment applications. The studies were performed in an electrochemical undivided cell reactor using a Ti/Ti02-Ru02-Ir02 anode. The preliminary investigation using various supporting electrolytes revealed that the presence of chloride removed maximum COD when compare to bromide or sulfate. Based on that, a detailed investigation was conducted to examine the effects of operating conditions such as the initial pH, chloride concentration, current density and initial catechol concentration on the removal of COD. The removal of COD using chloride as supporting electrolyte was shown to be a pseudo-first-order reaction. The results indicate that the initial rate of reaction was highly accelerated by chloride concentration and current density. The rate constant decreased as the initial resorcinol concentration increased. However, the initial pH did not show significant influence on the removal of COD. The present investigation showed the formation of high concentrations of AOX at the beginning of electrolysis, which decreased to lower levels during extended electrolysis.
Keywords: wastewater treatment | electrochemical oxidation | COD | TOC | AOX
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