Journal
JOURNAL OF MATERIAL CYCLES AND WASTE MANAGEMENT
Volume 15, Issue 1, Pages 82-89Publisher
SPRINGER
DOI: 10.1007/s10163-012-0092-7
Keywords
Long chain fatty acids; Food waste; Anaerobic digestion; Pretreatment; Methanogenic activity assay
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Funding
- SNU SIR Brain Korea 21 research program
- Brain Korea 21 project
- Ministry of Education and Human Resources Development
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This study investigated the effect of long chain fatty acids (LCFAs) removal as a pretreatment prior to anaerobic digestion on the production of methane from food waste. The results showed that the anaerobic digestion of food waste containing 1.6 g COD/L of LCFAs was not inhibited (4 days lag-time, 78.3 % methane recovery in 35 days) compared to that of lipid free food waste (3 days lag time, 72.5 % methane recovery in 35 days); however, some unsaturated LCFAs, which are toxic to microorganism, were accumulated in the batch anaerobic digestion reactor. Meanwhile, in a methanogenic activity study, the activity of methanogens was observed to be linearly inhibited by the presence of more than 1 g COD/L of LCFAs. The possibility of the accumulation of unsaturated LCFAs in the reactor should be considered when operating a large-scale continuous system.
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