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Combined advanced oxidation processes and aerobic biological treatment for synthetic fatliquor used in tanneries / Chitra Kalyanaraman in Industrial & engineering chemistry research, Vol. 51 N° 50 (Décembre 2012) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) . - pp. 16171-16181 Titre : Combined advanced oxidation processes and aerobic biological treatment for synthetic fatliquor used in tanneries Type de document : texte imprimé Auteurs : Chitra Kalyanaraman, Auteur ; Sri Bala Kameswari Kanchinadham, Auteur ; L. Vidya Devi, Auteur Année de publication : 2013 Article en page(s) : pp. 16171-16181 Note générale : Industrial chemistry Langues : Anglais (eng) Mots-clés : Leather  industry  Tannery  Biological  treatment  Aerobe  Oxidation Résumé : The use of synthetic oils, fats, and fatliquors in the leather industry has become popular due to their superiority in terms of high emulsifying power when compared to natural oil based fatliquor. Compared to natural oil based fatliquor, the quantity required is lesser and the leather is not unduly loaded with fats and oils to achieve specific softness. Generally, synthetic fatliquors are prepared from paraffins and are made emulsifiable by sulphochlorination to produce chlorinated paraffin sulphonates. Due to the inherent nature of synthetic fatliquor and its low BODS/COD ratio of 0.077, it is adsorbed over the microbes and reduces the efficiency of the aerobic treatment unit in the treatment plants. Hence the aim of the present study was to evaluate the environment friendliness of synthetic fatliquors containing chlorinated paraffin sulphonates, by undertaking aerobic biodegradation studies at the same operating conditions maintained in the tannery effluent treatment plants, viz., f/m ratio of 0.15 and hydraulic retention time (HRT) of one day. Considering the nature of the compounds present in the synthetic fatliquors, the biodegradability of the fatliquor was sought to be improved by adopting advanced oxidation processes (AOPs) like UV/H2O2 and Fenton's reagent as pretreatment. AOP pretreatment of UV/H2O2 and Fenton's reagent improves the BOD5/ COD ratio of synthetic fatliquor from 0.077 to 0.3 and 0.37 and the biodegradable organics are effectively degraded in the aerobic reactor. UV/H2O2 pretreated synthetic fatliquor produced biochemical oxygen demand (BODS) and chemical oxygen demand (COD) of 45 and 330 mg/L in the aerobic reactor and Fenton's reagent pretreated fatliquor produced BOD5 and COD of 28 and 240 mg/L in the aerobic treated effluent. It was evident from FT-IR analysis that the chlorinated paraffin sulfonates are degraded efficiently in the batch reactor after AOP pretreatment and short chain chlorinated compounds and carboxylic acids presence are observed in the operating conditions maintained in the batch aerobic reactors. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26732143 [article] Combined advanced oxidation processes and aerobic biological treatment for synthetic fatliquor used in tanneries [texte imprimé] / Chitra Kalyanaraman, Auteur ; Sri Bala Kameswari Kanchinadham, Auteur ; L. Vidya Devi, Auteur . - 2013 . - pp. 16171-16181. Industrial chemistry Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 51 N° 50 (Décembre 2012) . - pp. 16171-16181 Mots-clés : Leather  industry  Tannery  Biological  treatment  Aerobe  Oxidation Résumé : The use of synthetic oils, fats, and fatliquors in the leather industry has become popular due to their superiority in terms of high emulsifying power when compared to natural oil based fatliquor. Compared to natural oil based fatliquor, the quantity required is lesser and the leather is not unduly loaded with fats and oils to achieve specific softness. Generally, synthetic fatliquors are prepared from paraffins and are made emulsifiable by sulphochlorination to produce chlorinated paraffin sulphonates. Due to the inherent nature of synthetic fatliquor and its low BODS/COD ratio of 0.077, it is adsorbed over the microbes and reduces the efficiency of the aerobic treatment unit in the treatment plants. Hence the aim of the present study was to evaluate the environment friendliness of synthetic fatliquors containing chlorinated paraffin sulphonates, by undertaking aerobic biodegradation studies at the same operating conditions maintained in the tannery effluent treatment plants, viz., f/m ratio of 0.15 and hydraulic retention time (HRT) of one day. Considering the nature of the compounds present in the synthetic fatliquors, the biodegradability of the fatliquor was sought to be improved by adopting advanced oxidation processes (AOPs) like UV/H2O2 and Fenton's reagent as pretreatment. AOP pretreatment of UV/H2O2 and Fenton's reagent improves the BOD5/ COD ratio of synthetic fatliquor from 0.077 to 0.3 and 0.37 and the biodegradable organics are effectively degraded in the aerobic reactor. UV/H2O2 pretreated synthetic fatliquor produced biochemical oxygen demand (BODS) and chemical oxygen demand (COD) of 45 and 330 mg/L in the aerobic reactor and Fenton's reagent pretreated fatliquor produced BOD5 and COD of 28 and 240 mg/L in the aerobic treated effluent. It was evident from FT-IR analysis that the chlorinated paraffin sulfonates are degraded efficiently in the batch reactor after AOP pretreatment and short chain chlorinated compounds and carboxylic acids presence are observed in the operating conditions maintained in the batch aerobic reactors. ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=26732143