Effect of Discontinuing Sodium Bicarbonate on Fermentation Process of Palm Oil Mill Effluent
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The aim of this research is to investigate the effect of discontinuing sodium bicarbonate (NaHCO3) on the fermentation of POME to biogas. This research was conducted in a two liters continuous stirred tank reactor (CSTR) at thermophilic temperature of 55 oC. Fresh POME from Adolina mill without further treatment was used as feed. The result showed that at hydraulic retention time (HRT) of six days, and discontinuing of NaHCO3 addition, there was no significant effect on the production of biogas, change of pH, VS and TS degradation, except alkalinity. By discontinuing NaHCO3, biogas production was in the range of 4 – 6 L/day, while by adding NaHCO3 was 6 – 10 L/day. About 45% of VS degradation by discontinuing of NaHCO3 addition was obtained during the digestion, while by using NaHCO3 was 55%. pH of digester was relatively stable with average value was 6.7 and alkalinity was 2000 mg/L.