Basha, C.A. and Soloman, P.A. and Velan, M. and Balasubramanian, N. and Kareem, L.R. (2009) Participation of Electrochemical Steps in Treating Tannery Wastewater. Industrial and Engineering Chemistry Research, 48 (22). pp. 9786-9796. ISSN 0888-5885

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The performance of conventional biological treatment of tannery wastewater can be improved by the application of electrochemical treatment to selected streams. In this study, soak liquor, tanning effluent, and post-tanning effluent were electrochemically treated in batch recirculation mode. The experiments were designed, modeled, and optimized using response surface methodology. Considerable removal of chemical oxygen demand (COD, 94.8%) was achieved by treating the soak liquor in a batch recirculation cell under conditions of a circulation flow of 142.8 L h-1, a current density of 5.8 A dm-2, and a time of 7.05 h. Salt remaining in the treated soak liquor was partly utilized in improving the ionic conductivity of the post-tanning effluent for electrochemical treatment. In a separate treatment, the biodegradability index of the post-tanning effluent was improved from 0.3 to 0.67 under conditions of a circulation flow of 112.5 L h-1, a current density of 2.4 A dm-2, and a time of 2.15 h. Considerable reduction in the requirement of reactor volume or residence time of the existing aerated biological treatment system of the total wastewater stream can be achieved by applying such an electrochemical pretreatment. C. Ahmed Basha,*,† P. A. Soloman,‡ M. Velan,‡ N. Balasubramanian,‡ and L. Roohil Kareem

Item Type: Article
Subjects: Pollution Control
Depositing User: TTBD CECRI
Date Deposited: 23 Jan 2012 17:13
Last Modified: 23 Jan 2012 17:13

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