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Effect of initial pH adjustment on hydrolysis and acidification of sludge by ultrasonic pretreatment / Xiao-Rong Kang in Industrial & engineering chemistry research, Vol. 50 N° 22 (Novembre 2011) 

Public ISBD [article]  in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12372–12378 Titre : Effect of initial pH adjustment on hydrolysis and acidification of sludge by ultrasonic pretreatment Type de document : texte imprimé Auteurs : Xiao-Rong Kang, Auteur ; Guang-Ming Zhang, Auteur ; Lin Chen, Auteur Année de publication : 2012 Article en page(s) : pp. 12372–12378 Note générale : Chimie industrielle Langues : Anglais (eng) Mots-clés : Pretreatment  Acidification  Hydrolysis  pH Résumé : Batch tests were carried out to analyze the effect of pH in the range of 7-12 on the hydrolysis and acidification of sludge at room temperature. Ultrasonic pretreatment was conducted to disintegrate waste activated sludge (WAS) and accelerate WAS hydrolysis. The experimental results showed that the sludge with ultrasonic pretreatment was readily degraded in the hydrolysis and acidification process, and more organic substances were released with increase of initial pH. The optimal initial pH for sludge acidification was 11, and the short chain fatty acids (SCFAs) concentration reached about 1751 mg/L after 15 days of hydrolysis and acidification. Phosphorus release was investigated during hydrolysis and acidification at any pH adjustment. The SCFAs mainly consisted of acetic and propionic, accounting for 74.6-84% of total SCFAs. Three microbial species, including Bacteroidetes, γ-proteobacteria, and β-proteobacteria, were involved in different pH environments of the hydrolysis and acidification process, and, simultaneously, the three species were identified as being responsible for SCFAs accumulation and protein degradation. This study indicated that the combination of ultrasonic pretreatment, alkaline adjustment for hydrolysis, and acidification of WAS was an appropriate method for SCFAs accumulation and contributed to the demand of carbon source for WWTPs. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24745708 [article] Effect of initial pH adjustment on hydrolysis and acidification of sludge by ultrasonic pretreatment [texte imprimé] / Xiao-Rong Kang, Auteur ; Guang-Ming Zhang, Auteur ; Lin Chen, Auteur . - 2012 . - pp. 12372–12378. Chimie industrielle Langues : Anglais (eng) in Industrial & engineering chemistry research > Vol. 50 N° 22 (Novembre 2011) . - pp. 12372–12378 Mots-clés : Pretreatment  Acidification  Hydrolysis  pH Résumé : Batch tests were carried out to analyze the effect of pH in the range of 7-12 on the hydrolysis and acidification of sludge at room temperature. Ultrasonic pretreatment was conducted to disintegrate waste activated sludge (WAS) and accelerate WAS hydrolysis. The experimental results showed that the sludge with ultrasonic pretreatment was readily degraded in the hydrolysis and acidification process, and more organic substances were released with increase of initial pH. The optimal initial pH for sludge acidification was 11, and the short chain fatty acids (SCFAs) concentration reached about 1751 mg/L after 15 days of hydrolysis and acidification. Phosphorus release was investigated during hydrolysis and acidification at any pH adjustment. The SCFAs mainly consisted of acetic and propionic, accounting for 74.6-84% of total SCFAs. Three microbial species, including Bacteroidetes, γ-proteobacteria, and β-proteobacteria, were involved in different pH environments of the hydrolysis and acidification process, and, simultaneously, the three species were identified as being responsible for SCFAs accumulation and protein degradation. This study indicated that the combination of ultrasonic pretreatment, alkaline adjustment for hydrolysis, and acidification of WAS was an appropriate method for SCFAs accumulation and contributed to the demand of carbon source for WWTPs. DEWEY : 660 ISSN : 0888-5885 En ligne : http://cat.inist.fr/?aModele=afficheN&cpsidt=24745708