Effect of long chain fatty acids removal as a pretreatment on the anaerobic digestion of food waste |
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Authors: | Han Sang Cho Hee Sun Moon Jae Yong Lim Jae Young Kim |
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Institution: | 1. Department of Civil and Environmental Engineering, College of Engineering, Seoul National University, 599 Gwanak-ro, Gwanakgu, Seoul, 151-744, Republic of Korea 3. Dongbu Steel, 103-2 Munji-dong, Yuseong-gu, Daejeon, Korea 2. School of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University, Seoul, Republic of Korea
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Abstract: | 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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