Influence of activated carbon amended ASBR on anaerobic fermentative bio-hydgrogen production from glucose

Abstract:

Abstract：Effect of activated carbon amended ASBR on fermentative bio-hydgrogen production from glucose was evaluated at HRTs ranging from 48h to 12h with initial pH of 6.0 and system temperature of 60℃. Experimental results showed that the performance of activated carbon amended ASBRs were more stable than that of ASBRs without activated carbon addition regarding on hydrogen production and pH. Higher hydrogen yield(HY) and hydrogen production rate(HPR) were observed in the activated carbon amended ASBRs, with 65%、63%、54%、56% enhancement of hydrogen yield in smaller size activated carbon amended reactor under the tested HRTs ranges, and the maximum HPR of 7.09±0.31 L-H2/L/d and HY of 1.42±0.03 mol-H2/mol-glucose was obtained at HRT of 12h. The major soluble products form hydrogen fermentation were n-butyric acid and acetic acid, accounting for 46-66% and 30%-34% of total soluble metabolic products(SMP), respectively, indicating that the dominant H2 producers in the mixed culture belonged to acidogenic bacteria that underwent butyrate-type fermentation. In addition, higher concentration of VFA generation was observed in the activated carbon amended ASBRs.