| Abstract |
| In this study, effect of SRT control at methane reactor was investigated on the methane production in anaerobic digestion of food waste under two different conditions (SRT 15days and 60days). A two phase anaerobic digestion system was operated with pre-solubilization of the food waste at SRT (same as the HRT) 15days for the methane reactor. On the other hand, a separate 3L methane reactor was operated at the SRT 60days to enhance methane production under the 15days HRT. Comparable results were obtained by increasing the SRT of the methane reactor to 60 days. VS/TS ratio in the reactor was increased to 0.92 . The reduction of SCOD (soluble COD) and TVFA (Total volatile fatty acid) was 18.39% and 14.75% in the methane reactor, which are enhanced by increasing the SRT to 60days. Consequently biogas production was 0.682 L/gVS with methane contend 62.83% which are 10.75% and 3.78% higher than those of SRT 15days. These results could be clearly explained by the bacterial cell density (8.18×108 cell/mL)in the methane reactor showing 1.73times higher than that of SRT 15days. Although accumulation of sodium was not significant in the methane reactor at the increased SRT, there was a certain inhibition in the methane production, which could be a negative effect. In this study, however, it was solved by washing the return sludgy with distilled water resulting in 8.82% increase of the methane production. |
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| Key Words |
| Food waste, Methane fermentation, Solid retention time (SRT), Two phase Anaerobic digestion, Volatile fatty acid(VFA). |
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