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Chitosan flocculation of cardboard-mill secondary biological wastewater / François Renault in Chemical engineering journal, Vol. 155 N° 3 (Decembre 2009) 

Public ISBD [article]  in Chemical engineering journal > Vol. 155 N° 3 (Decembre 2009) . - pp. 775-783 Titre : Chitosan flocculation of cardboard-mill secondary biological wastewater Type de document : texte imprimé Auteurs : François Renault, Auteur ; Bertrand Sancey, Auteur ; Jérémie Charles, Auteur Année de publication : 2010 Article en page(s) : pp. 775-783 Note générale : Génie Chimique Langues : Anglais (eng) Mots-clés : Bioflocculation  Biological  wastewater  Chitosan  Polyaluminium  chloride  (PAC)  Temperature Index. décimale : 660 Résumé : Flocculation is a common secondary treatment procedure for the removal of suspended solids, colloids and organic matter present in industrial wastewater. In the present study, the flocculation of cardboard industry wastewater, treated by a biological process in an aerated lagoon, was examined using commercial grade polyaluminium chloride (PAC) and chitosan (CHITO) dissolved in acetic acid as flocculating agents. A series of flocculation jar-tests was conducted under different conditions. The influence of the flocculant dosage and the temperature of the lagoon on the quality of the treated wastewater was investigated. Optimum temperature for PAC was in the range 13–21 °C for a dosage of 0.3–0.4 mL L−1 but the results were highly temperature-dependent; PAC lowered chemical oxygen demand (COD) by 40–45% and turbidity by 55–60%. With CHITO, the process was more efficient than with PAC for an effective dosage of 7 mL L−1 and no influence of temperature was observed. Chitosan lowered the COD by over 80% and turbidity by more than 85%. It generated bigger flocs making settling faster than with PAC. It also removed residual colour and led to a significant decrease in the amount of heavy metals present in the effluent. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X908Y5-2&_user=6 [...] [article] Chitosan flocculation of cardboard-mill secondary biological wastewater [texte imprimé] / François Renault, Auteur ; Bertrand Sancey, Auteur ; Jérémie Charles, Auteur . - 2010 . - pp. 775-783. Génie Chimique Langues : Anglais (eng) in Chemical engineering journal > Vol. 155 N° 3 (Decembre 2009) . - pp. 775-783 Mots-clés : Bioflocculation  Biological  wastewater  Chitosan  Polyaluminium  chloride  (PAC)  Temperature Index. décimale : 660 Résumé : Flocculation is a common secondary treatment procedure for the removal of suspended solids, colloids and organic matter present in industrial wastewater. In the present study, the flocculation of cardboard industry wastewater, treated by a biological process in an aerated lagoon, was examined using commercial grade polyaluminium chloride (PAC) and chitosan (CHITO) dissolved in acetic acid as flocculating agents. A series of flocculation jar-tests was conducted under different conditions. The influence of the flocculant dosage and the temperature of the lagoon on the quality of the treated wastewater was investigated. Optimum temperature for PAC was in the range 13–21 °C for a dosage of 0.3–0.4 mL L−1 but the results were highly temperature-dependent; PAC lowered chemical oxygen demand (COD) by 40–45% and turbidity by 55–60%. With CHITO, the process was more efficient than with PAC for an effective dosage of 7 mL L−1 and no influence of temperature was observed. Chitosan lowered the COD by over 80% and turbidity by more than 85%. It generated bigger flocs making settling faster than with PAC. It also removed residual colour and led to a significant decrease in the amount of heavy metals present in the effluent. DEWEY : 660 ISSN : 1385-8947 En ligne : http://www.sciencedirect.com/science?_ob=ArticleURL&_udi=B6TFJ-4X908Y5-2&_user=6 [...]