Anaerobic Biohythane Production in an Internal Two-Stage Bioreactor: Kitchen Waste Concentration Optimization

Peer Mohamed Abdul, Chyi-How Lay (), Chiu-Yue Lin, Tan-Phat Vo and Chia-Min Chang
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Peer Mohamed Abdul: Department of Chemical and Process Engineering, Faculty of Engineering and Built Environment, Universiti Kebangsaan Malaysia, Bangi 43600, Selangor Darul Ehsan, Malaysia
Chyi-How Lay: Green Energy and Biotechnology Industry Research Center, Feng Chia University, Taichung 40724, Taiwan
Chiu-Yue Lin: Department of Environmental Engineering and Science, Feng Chia University, Taichung 40724, Taiwan
Tan-Phat Vo: Master’s Program of Green Energy Science and Technology, Feng Chia University, Taichung 40724, Taiwan
Chia-Min Chang: Department of Environmental Engineering and Science, Feng Chia University, Taichung 40724, Taiwan

Energies, 2024, vol. 18, issue 1, 1-16

Abstract: An internal two-stage bioreactor constructed with a hydrogen chamber and a methane chamber with a working volume of 300 mL and 4700 mL, respectively, was operated using various kitchen waste (KW) concentrations from 10 to 80 g COD/L with a hydraulic retention time of 2 days to characterize the biomethane production performance. The results showed that daily biohythane production exhibited a similar increasing trend at KW concentrations of 10 to 40 g COD/L. The peak biomethane production was 2481 mL/day at a KW concentration of 40 g COD/L. The KW concentration could also affect the COD, carbohydrate, lipid, and protein removal efficiencies. These removal efficiencies were somehow dependent on the KW concentration, with two notable KW concentration groups of 10–20 g COD/L and 40–80 g COD/L. After 80 days of cultivation, Firmicutes dominated the hydrogen chamber, and Methanobacteriaceae and Methanomicrobiaceae dominated the methane chamber. This study presents the optimal KW concentration for high biohythane production efficiency in a novel internal two-stage bioreactor and reveals the dominant microorganisms in its microbial community.

Keywords: kitchen waste; bio-H 2; bio-CH 4; bioreactor design; substrate concentration (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2024
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