Digestion Performance and Microbial Metabolic Mechanism in Thermophilic and Mesophilic Anaerobic Digesters Exposed to Elevated Loadings of Organic Fraction of Municipal Solid Waste

Yiming Gao, Xiaoying Kong, Tao Xing, Yongming Sun, Yi Zhang, Xingjian Luo and Yong Sun
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Yiming Gao: College of Engineering, Northeast Agricultural University, Harbin 150030, China
Xiaoying Kong: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
Tao Xing: 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
Yi Zhang: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
Xingjian Luo: Guangzhou Institute of Energy Conversion, Chinese Academy of Sciences, Guangzhou 510640, China
Yong Sun: College of Engineering, Northeast Agricultural University, Harbin 150030, China

Energies, 2018, vol. 11, issue 4, 1-12

Abstract: Mesophilic and thermophilic anaerobic digestion reactors (MR and TR) for the organic fraction of municipal solid waste (OFMSW) were tested to reveal the differential microbial responses to increasing organic loading rate (OLR). MR exhibited faster adaptation and better performance at an OLR range of 1.0–2.5 g VS·L −1 ·d −1 , with average profiles of a biogas yield of 0.38 L/gVS added *d at 0.5 g/L*d OLR and 0.69 L/gVS added *d at 2.5 g/L*d OLR, whereas TR had a biogas yield of 0.07 L/gVS added *d at 0.5 g/L*d OLR and 0.44 L/gVS added *d at 2.5 g/L*d OLR. The pyrosequencing results of amplicons revealed the microbial mechanisms of OFMSW anaerobic digestion. Larger shifts in the bacteria composition were observed in the TR with OLR elevation. For methanogens in both reactors, Methanothrix dominated in the MR while Methanosarcina was favored in the TR. Moreover, analysis of the mode and efficiency of metabolism between the MR and TR demonstrated different performances with more efficiency related to the limiting hydrolytic acid step.

Keywords: anaerobic digestion; organic fraction of municipal solid waste; microbial mechanisms; metabolism analysis (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: 2018
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (7)

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