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The dechromatation step in wastewater treatment plants / Giuseppe Trunfio in Industrial & engineering chemistry research, Vol. 49 N° 23 (Décembre 2010) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 49 N° 23 (Décembre 2010) . - pp. 12217–12223 Titre : The dechromatation step in wastewater treatment plants : fundamental role and optimization Type de document : texte imprimé Auteurs : Giuseppe Trunfio, Auteur ; Gregorio Crini, Auteur Année de publication : 2011 Article en page(s) : pp. 12217–12223 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Wastewater  treatment  Dechromatation  Optimization Résumé : Chromium compounds represent an important class of chemicals and are widely used in many industrial processes. Their release in the aquatic environment constitutes a concerning source of toxicity for flora and fauna. Chromium exists mainly in the trivalent and hexavalent forms, with the latter being much more soluble and toxic and requiring specific treatment before discharge. A review of the literature data reveals that there are few treatment methods applicable on an industrial scale, mainly because of efficiency and maintenance issues. Among them, the reduction at acidic pH by NaHSO3 and the further precipitation of the more insoluble Cr3+ species formed at neutral pH is the most employed technique, given the opportunity to automatically monitor the reaction by means of simple pH and ORP sensors. On this account, we optimized the setting of pH and ORP parameters, applying the method to synthetic solutions and real industrial wastewater from surface-treatment industries. The experimental results showed that optimization of the parameters (i.e., pH = 2.5 and ORP = 280 mV) leads to a reduction of reducing agent employment and fewer chemical compounds in the solution and final sludge. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101042a [article] The dechromatation step in wastewater treatment plants : fundamental role and optimization [texte imprimé] / Giuseppe Trunfio, Auteur ; Gregorio Crini, Auteur . - 2011 . - pp. 12217–12223. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 49 N° 23 (Décembre 2010) . - pp. 12217–12223 Mots-clés : Wastewater  treatment  Dechromatation  Optimization Résumé : Chromium compounds represent an important class of chemicals and are widely used in many industrial processes. Their release in the aquatic environment constitutes a concerning source of toxicity for flora and fauna. Chromium exists mainly in the trivalent and hexavalent forms, with the latter being much more soluble and toxic and requiring specific treatment before discharge. A review of the literature data reveals that there are few treatment methods applicable on an industrial scale, mainly because of efficiency and maintenance issues. Among them, the reduction at acidic pH by NaHSO3 and the further precipitation of the more insoluble Cr3+ species formed at neutral pH is the most employed technique, given the opportunity to automatically monitor the reaction by means of simple pH and ORP sensors. On this account, we optimized the setting of pH and ORP parameters, applying the method to synthetic solutions and real industrial wastewater from surface-treatment industries. The experimental results showed that optimization of the parameters (i.e., pH = 2.5 and ORP = 280 mV) leads to a reduction of reducing agent employment and fewer chemical compounds in the solution and final sludge. DEWEY : 660 ISSN : 0888-5885 En ligne : http://pubs.acs.org/doi/abs/10.1021/ie101042a