Links between Process Performance and Microbial Community of Pennisetum Hybrid Co-Digested with Municipal Solid Waste

Quanlin Zhao, Shuibin He, Lianhua Li, Yongming Sun and Haiwei Ren
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Quanlin Zhao: School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China
Shuibin He: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
Lianhua Li: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
Yongming Sun: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
Haiwei Ren: School of Life Science and Engineering, Lanzhou University of Technology, Lanzhou 730050, China

Energies, 2021, vol. 14, issue 12, 1-16

Abstract: In this study, the links between performance and microbial communities were investigated with municipal solid waste (MSW) at two feedstock ratios and eight organic loading rates (OLRs). The co-digestion systems were stably operated at OLRs of 2.0–6.0 g VS/(L·d). The performance of the co-digestion system varied with the feedstock ratio. Compared with the 50:50 (hybrid Pennisetum :MSW) system, the 75:50 system, GM31, obtained increases of 1.93–17.68% and 0.29–23.29% for the specific biogas and methane yields, respectively. Whereas a shift in bacterial and methanogen communities occurred as the operating conditions changed, particularly with OLR variations. The genera Saccharofermentans , Prevotella, Clostridium , Syntrophomonas , and Proteiniphilum became the dominant bacteria for the conversion of carbohydrates and nitrogen compounds as the OLR increased. Meanwhile, a shift from acetoclastic to hydrogenotrophic or multifunctional methanogens was observed.

Keywords: anaerobic digestion; municipal solid waste; Pennisetum hybrid; biogas yield; microbial community (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: 2021
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