| dc.description.abstract | Acidogenesis is a complex process in which anaerobic microorganism
collaboratively decompose organic compounds to volatile fatty acid. This
research aimed to obtain the optimal Hydraulic Retention Time (HRT) in the
acidogenesis process using Palm Oil Mill Effluent (POME) at thermophilic
temperature. Initially, the suitable loading up was determined by varying the HRT
20, 15, 10 and 4 days in the continuous stirred tank reactor (CSTR) with mixing
rate 200 rpm, pH 6,0 ± 0.2, and temperature 55 oC. Next, suitable pH was
determined by varying the pH at 6,0; 5,5; 5,0 and 4,5. Analysis solids (TS, VS,
TSS and VSS), COD and VFA conducted to assess changes in organic compounds
degraded to VFA. Stable microbial growth characterized by an increased
concentration of VSS obtained at HRT 4 with COD reduction amounted to 52,9%,
while the highest production of total VFA and VFA/alkalinity ratio obtained at
HRT 20 with respective values of 6.992,9 mg/L and 3,43. The optimal pH was
achieved at pH 5 with the production of total VFA achieved was 9.723,9 mg/L and
the concentration of acetic acid, propionic acid and butyric acid were 4.455,6;
1.544,5; and 3.723,8 mg/L, respectively. While COD degradation was 44% and
VFA/alkalinity ratio was 12,6. | en_US |
