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Reduction of Gibbs free energy and enhancement of Methanosaeta by bicarbonate to promote anaerobic syntrophic butyrate oxidation

descriptionPublicationkeyboard_double_arrow_right Article , Journal 01 Nov 2018 Australia Publisher:Elsevier BVJournal:Bioresource Technology, volume 267, pages 209-217 (issn: 0960-8524,

Authors: Zhang, Yupeng; Li, Jianzheng; Liu, Fengqin; Yan, Han; Li, Jiuling; Zhang, Xue;

doi: 10.1016/j.biortech.2018.06.098

pmid: 30025316

Reduction of Gibbs free energy and enhancement of Methanosaeta by bicarbonate to promote anaerobic syntrophic butyrate oxidation

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Abstract

Bicarbonate (HCO3-) has been extensively researched as a buffer in anaerobic digestion. The effect of HCO3- concentration on syntrophic butyrate oxidation process was evaluated by batch culturing of anaerobic activated sludge, and the mechanism was further revealed by the changes of Gibbs free energy (ΔG) and the interspecies transfers of electron and proton. The results showed that butyrate degradation rate was enhanced by 32.07% when the supplement of HCO3- increased from 0 to 0.20 mol/L. However, methane production and acetate degradation were strongly inhibited by HCO3- more than 0.10 mol/L. More function of HCO3- was found as 1) decreasing the ΔG of syntrophic methanogenesis of butyrate while increasing the ΔG of methanogenesis of acetate, 2) enriching M. harundinacea and M. concilii, 3) increasing the diffusion rate of protons between the syntrophic consortia. This work would increase the anaerobic digestion efficiency by enhancing the interaction of the syntrophic consortia.

Country

Australia

Related Organizations

Harbin Institute of Technology
China (People's Republic of)
University of Queensland
Australia
Harbin Institute of Technology
China (People's Republic of)

Keywords

1502 Bioengineering, Sustainability and the Environment, Sewage, Methanogens, 2105 Renewable Energy, 2311 Waste Management and Disposal, Bicarbonate, Bicarbonates, 2305 Environmental Engineering, Syntrophic, Anaerobic digestion, Butyric Acid, Gibbs free energy, Methane, Oxidation-Reduction

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