A Kinetic Model for Anaerobic Digestion and Biogas Production of Plant Biomass under High Salinity

Jing Wang, Bing Liu, Meng Sun, Feiyong Chen, Mitsuharu Terashima and Hidenari Yasui
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Jing Wang: School of Municipal and Environmental Engineering, Shandong Jianzhu University, Jinan 250101, China
Bing Liu: Resources and Environment Innovation Research Institute, Shandong Jianzhu University, Jinan 250101, China
Meng Sun: Faculty of Environmental Engineering, The University of Kitakyushu, 1-1, Hibikino, Wakamatsu, Kitakyushu 808-0135, Japan
Feiyong Chen: Resources and Environment Innovation Research Institute, Shandong Jianzhu University, Jinan 250101, China
Mitsuharu Terashima: Faculty of Environmental Engineering, The University of Kitakyushu, 1-1, Hibikino, Wakamatsu, Kitakyushu 808-0135, Japan
Hidenari Yasui: Faculty of Environmental Engineering, The University of Kitakyushu, 1-1, Hibikino, Wakamatsu, Kitakyushu 808-0135, Japan

IJERPH, 2022, vol. 19, issue 11, 1-20

Abstract: The aim of this study is to evaluate the anaerobic digestion and biogas production of plant biomass under high salinity by adopting a theoretical and technical approach for saline plant-biomass treatment. Two completely mixed lab-scale mesophilic reactors were operated for 480 days. In one of them, NaCl was added and the sodium ion concentration was maintained at 35.8 g-Na + ·L −1 , and the organic loading rate was 0.58-COD·L −1 ·d −1 –1.5 g-COD·L −1 ·d −1 ; the other added Na 2 SO 4 –NaHCO 3 and kept the sodium ion concentration at 27.6 g-Na + ·L −1 and the organic loading rate at 0.2 g-COD·L −1 ·d −1 –0.8 g-COD·L − 1 ·d −1 . The conversion efficiencies of the two systems (COD to methane) were 66% and 54%, respectively. Based on the sulfate-reduction reaction and the existing anaerobic digestion model, a kinetic model comprising 12 types of soluble substrates and 16 types of anaerobic microorganisms was developed. The model was used to simulate the process performance of a continuous anaerobic bioreactor with a mixed liquor suspended solids (MLSS) concentration of 10 g·L −1 –40 g·L −1 . The results showed that the NaCl system could receive the influent up to a loading rate of 0.16 kg-COD/kg-MLSS·d −1 without significant degradation of the methane conversion at 66%, while the Na 2 SO 4 –NaHCO 3 system could receive more than 2 kg-COD·kg −1 -MLSS·d −1 , where 54% of the fed chemical oxygen demand (COD) was converted into methane and another 12% was observed to be sulfide.

Keywords: ADM1; high salinity; kinetics; methane fermentation; sulfate reduction (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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