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Conflict of Interest: In relation to this article, we declare that there is no conflict of interest.

Publication history: Received April 11, 2003
Accepted October 6, 2003

This is an Open-Access article distributed under the terms of the Creative Commons Attribution Non-Commercial License (http://creativecommons.org/licenses/bync/3.0) which permits unrestricted non-commercial use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Reduction of COD and Color of Acid and Reactive Dyestuff Wastewater Using Ozone

Jae-Wook Choi Hyung Keun Song Whun Lee¹ Kee-Kahb Koo¹ Choon Han² Byung-Ki Na^3†

Clean Technology Center, Korea Institute of Science and Technology, P.O.Box 131, Cheongryang, Seoul 130-650, Korea ¹Dept. of Chem. Eng., Sogang Univ., 1 Sinsudong, Mapo, Seoul 121-742, Korea ²Dept. of Chem. Eng., Kwangwoon Univ., Wolgyedong, Nowonku, Seoul 139-701, Korea ³School of Chem. Eng., Chungbuk National Univ., San 48 Gaesindong, Cheongju, Chungbuk 361-763, Korea

nabk@chungbuk.ac.kr

Korean Journal of Chemical Engineering, March 2004, 21(2), 398-403(6), 10.1007/BF02705427

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Abstract

Wastewaters obtained from bromamine acid dye and reactive dye manufacturing were treated by ozone bubbling in a cylindrical batch reactor for the purpose of reducing COD to below 150 mg/L, which is the environmental discharge standard of the Republic of Korea. Remarkable COD reduction and decolorization were observed at pH over 11. High inlet gas flowrate and high concentration of ozone gave better results. Little precipitation was observed under the conditions of remarkable COD reduction. At pH of 11, 15 LPM of inlet gas flowrate and 89.3 g/Nm³ of ozone flowrate, the COD of bromamine acid dyestuff wastewater was reduced to 95 mg/L after 90 minutes, and the COD of reactive dyestuff wastewater was reduced to 120 mg/L after 120 minutes. Decolorization was completed after 30 minutes of reaction.

Keywords

Ozone Dyestuff Wastewater Color COD pH

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