Respirometric evaluation and modelling of acetate utilization in sequencing batch reactor under pulse and continuous feeding

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• 作者：Asl? S. Ç ; ??g?n^a ; ^{ciggin@itu.edu.tr} ; ^{asliseyhan3@yahoo.com} ; Gü ; ç ; lü ; Insel^a ; ^{inselhay@itu.edu.tr} ; Mauro Majone^b ; ^{mauro.majone@uniroma1.it} ; Derin Orhon^a ; ^c ; ^{orhon@itu.edu.tr}
• 关键词：Acetate ; PHB storage ; Modelling ; Feeding regime ; Culture history
• 刊名：Bioresource Technology
• 出版年：2012
• 出版时间：March 2012
• 年：2012
• 卷：107
• 期：Complete
• 页码：61-69
• 全文大小：441 K

文摘

The study investigated the effect of feeding regime and sludge age on acetate utilization. Parallel sequencing batch reactors (SBRs) were operated at steady-state with pulse and continuous feeding of acetate at sludge ages of 8 and 2 days. Acetate was always partially converted to poly-¦Â-hydroxybutyrate (PHB). The adopted model remained equally applicable to oxygen uptake rate and PHB profiles reflecting different feeding regimes and culture history. Sludge age was significant on the rate parameters of storage and direct growth (k_STO, ¦Ì_H1), while the feeding regime affected half saturation coefficients (K_STO, K_S1). Changing the sludge age from 8 days to 2 days reduced the k_STO value from 8.0 day^? to 6.5 day^? and increased the corresponding ¦Ì_H1 value from 1.5 day^? to 2.5 day^?, regardless of the feeding regime; conversely, changing from pulse to continuous feeding reduced K_STO while increasing K_S for the SBR operation at the same sludge age.