Add time:07/26/2019         Source:sciencedirect.com

High-purity propionate production from glycerol in mixed culture fermentation (MCF) induced by high ammonium concentration was investigated. Fed-batch experiments revealed that higher ammonium concentration (>2.9 g/L) had simultaneous negative effects on acetate and propionate degradation. Propionate production and yield was up to 22.6 g/L and 0.45 g COD/g COD glycerol, respectively, with a purity of 96%. Sequential batch experiments demonstrated that the yields of propionate were 0.3 ± 0.05, 0.32 ± 0.01, and 0.34 ± 0.03 g COD/g COD at a glycerol concentration of 2.78, 4.38, and 5.56 g/L, respectively, and the purity of propionate was 91–100%. Microbial community analysis showed that the phylum Firmicutes dominated the bacterial community at different glycerol concentrations. However, the Methanosaeta population decreased from 46% to 6% when glycerol concentration increased from 2.78 to 5.56 g/L, resulting in lower acetate degradation rate. Thus, the present study might provide an alternative option for the production of propionate from glycerol via MCF.

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