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Participation of electrochemical steps in treating tannery wastewater / C. Ahmed Basha in Industrial & engineering chemistry research, Vol. 48 N° 22 (Novembre 2009) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 9786–9796 Titre : Participation of electrochemical steps in treating tannery wastewater Type de document : texte imprimé Auteurs : C. Ahmed Basha, Auteur ; P. A. Soloman, Auteur ; M. Velan, Auteur Année de publication : 2010 Article en page(s) : pp. 9786–9796 Note générale : Chemical engineering Langues : Anglais (eng) Mots-clés : Tannery  wastewater  Electrochemically  treatement Résumé : 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. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900464s [article] Participation of electrochemical steps in treating tannery wastewater [texte imprimé] / C. Ahmed Basha, Auteur ; P. A. Soloman, Auteur ; M. Velan, Auteur . - 2010 . - pp. 9786–9796. Chemical engineering Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 48 N° 22 (Novembre 2009) . - pp. 9786–9796 Mots-clés : Tannery  wastewater  Electrochemically  treatement Résumé : 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. En ligne : http://pubs.acs.org/doi/abs/10.1021/ie900464s