Journal
BIORESOURCE TECHNOLOGY
Volume 267, Issue -, Pages 209-217Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.06.098
Keywords
Gibbs free energy; Methanogens; Bicarbonate; Anaerobic digestion; Syntrophic
Funding
- National Natural Science Foundation of China, China [51478141]
- Harbin Institute of Technology Environment and Ecology Innovation Special Funds [HSCJ201614]
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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 (Delta G) 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 Delta G of syntrophic methanogenesis of butyrate while increasing the Delta G 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.
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