Oleate Impacts on Acetoclastic and Hydrogenotrophic Methanogenesis under Mesophilic and Thermophilic Conditions

Xiang Li, Yang Yang, Chen-Shun Lu, Takuro Kobayashi, Zhe Kong and Yong Hu ()
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Xiang Li: School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211816, China
Yang Yang: School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211816, China
Chen-Shun Lu: School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211816, China
Takuro Kobayashi: Material Cycles Division, National Institute for Environmental Studies, 16-2 Onogawa, Tsukuba 305-8506, Japan
Zhe Kong: School of Environmental Science and Engineering, Suzhou University of Science and Technology, Suzhou 215009, China
Yong Hu: School of Environmental Science and Engineering, Nanjing Tech University, Nanjing 211816, China

IJERPH, 2023, vol. 20, issue 4, 1-12

Abstract: This study investigated oleate inhibition concentration on mesophilic and thermophilic sludge by utilizing acetate and H 2 /CO 2 (80:20, v / v ) as substrate, respectively. In addition, another batch experiment was carried out to explore the influence of oleate loads (mM-oleate/g-VS) on methane production. Generally, the mesophilic anaerobic system was more stable than the thermophilic system, which embodied higher microbial abundance, higher methane yield, and higher oleate tolerance. Furthermore, this study provides a possible methanogenic pathway impacted by oleate under mesophilic and thermophilic conditions according to functional microbial composition. Lastly, this paper provides noticeable and avoidable oleate concentrations and loads under different experimental conditions as a guide for future anaerobic bioreactors of lipidic waste biodegradation.

Keywords: oleate; acetoclastic methanogenesis; hydrogenotrophic methanogenesis; temperature (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2023
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