Journal
BIORESOURCE TECHNOLOGY
Volume 271, Issue -, Pages 244-250Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2018.09.116
Keywords
Acidogenic fermentation type; Food waste; Microbial community; NaCl concentration; Volatile fatty acids
Funding
- National Natural Science Foundation of China [51778580, 51608480]
- Natural Science Foundation of Zhejiang Province of China [LQ16E080001]
- China Scholarship Council (iCET 2017)
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This study explored the effects of NaCl on volatile fatty acid (VFA) production from food waste by acidogenic fermentation. The production and composition of VFAs, and the microbial community in acidogenic fermentation were investigated at four different NaCl concentrations: 10, 30, 50, and 70 g/L, and at 0 g/L (control). The highest VFA production was 0.542 g/g dry weight of food waste at 10 g/L NaCl, and about 23% lower but still high at 70 g/L NaCl. Interestingly, as NaCl concentration increased, the residence time of lactic acid in the reactor increased, and the maximum production also increased. The type of acidogenic fermentation also changed from butyric acid to propionic acid as the NaCl concentration increased. Microbial community analysis showed that a large number of propionibacteria were present at the end of fermentation, indicating their high tolerance to NaCl.
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