Acetate treatment in 70 degrees C upflow anaerobic sludge-blanket (UASB) reactors: start-up with thermophilic inocula and the kinetics of the UASB sludges

Applied Microbiology and Biotechnology
R Lepistö, J A Rintala

Abstract

This study focused on the use the thermophilic anaerobic granulae in the start-up of 70 degrees C acetate-fed upflow anaerobic sludge-blanket (UASB) reactors and the kinetics of granulae grown at 70 degrees C. In the UASB reactors, chemical oxygen demand removal commenced within 48 h of the start-up. The maximum reduction in chemical oxygen demand was 84% with the feed containing yeast and 71% without a yeast supplement. In the bioassays, the yeast-grown sludge converted 98% of the acetate consumed to methane as compared to 92% for the sludge grown without yeast. The highest initial specific methane production rate (mu-CH4) of the UASB sludges grown at 70 degrees C was 0.088 h(-1) at an acetate concentration of 4.6mM. The higher initial acetate concentration was found to prolong the lag-phase in methane production significantly and to decrease mu-CH4. The half-saturation constant (Ks), the inhibition constant (Ki), the inhibition response coefficient (n) and the mu-CH4-max, calculated according to a modified Haldane equation, were 1.5 mM, 2.8 mM, 0.8 and 0.28 h(-1), respectively. The prolonged starvation of the 70 degrees C sludge (15 days) decreased the mu-CH4 from about 0.022 h(-1) to 0.011 h(-1) and increased the lag phase i...Continue Reading

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Citations

Mar 27, 2001·Bioresource Technology·E SalminenA Oikari
Sep 15, 2007·Bioresource Technology·Ioannis D Manariotis, Sotirios G Grigoropoulos
Jul 4, 2012·Lancet·Rik Schrijvers, Zeger Debyser
Mar 4, 2014·The Journal of Infectious Diseases·Sophie JoseUNKNOWN UK Collaborative HIV Cohort Study Steering Committee
Oct 27, 2017·Environmental Technology·A GilM A Martín
Mar 16, 2021·Bioprocess and Biosystems Engineering·Mirian Y K NizMarcelo Zaiat
May 22, 2021·Bioprocess and Biosystems Engineering·Shinichi AkizukiTatsuki Toda

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