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Bioresource Technology
Volume 331, 2021, 125004

Enhancement of enzyme activities and VFA conversion by adding Fe/C in two-phase high-solid digestion of food waste: Performance and microbial community structure

Pingbo Wanga, Meiying Yeb, Yue Cuic, Xiong Xiaoa, Dexun Zou a, Rongxin Guoa,Yanping Liua

Department of Environmental Science and Engineering, Beijing University of Chemical Technology, Beijing 100029, PR China.

Abstract

Two-phase high-solid digestion is conducive to the degradation of food waste. In this study, Fe/C was added in high-solid digestion in different acidification and/or methanogenic phase. The experimental results indicated that it significantly increased the cumulative yield of biomethane. When Fe/C was added to the acidification phase only and both the acidification and methanogenic phases, the biomethane yield reached 474.07 ± 7.03 and 475.47 ± 4.68 mL·g VS-1, respectively, and the biodegradation rate reached 87.30% and 87.58%, respectively, indicating that Fe/C had mainly effect on the performance of acidification phase. In a two-phase anaerobic fermentation system, the activity of dehydrogenases and the concentration of coenzyme F420 were 2.23–2.95 mg·g-1·h-1 and 0.0063–0.0294 mol·g-1 volatile solids, respectively. Additionally, the archaeal communities production pathway of methane from using acetic acid to using hydrogen as the reactant.

Keywords: Volatile fatty acids, Fe/C addition, Food waste, Two-phase high-solid digestion, Microbial community.

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