| Popis: |
Collaboration between anaerobic wastewater digestion and membrane separation is obtaining many interests for its high-rate bioreactors performance. This research aimed to study the performance of membrane bioreactor in digestion of palm oil mill effluent (POME) into biogas. Tubular polyvinylidenefluoride (PVDF) ultrafiltration membrane with pore size 0.03 µm was used in this study. Experiments were performed in two runs, using CSTR under mesophilic temperature with (Run 1) and without MBR (Run 2). During first 3 weeks, both runs were operated for sludge acclimation. After 3 weeks, MBR operation was started in the first run. Sludge retention time (SRT) was maintained at 45 days between 0 - 58th day of fermentation time and 30 days after 58th days, while hydraulic retention time (HRT) was maintained at 10 days for an MBR. Results from MBR treatment showed that by extending SRT in return the excess sludge from digester, chemical oxygen demand (COD) loading rate and suspended solids (SS) concentration were increased to 6.9 kg/m3/d and 37,000 mg/L, respectively. COD effluent concentration was kept < 2,000 mg/L with COD removal ratio more than 97%, biological oxygen demand (BOD) effluent was reached around 100 mg/L, COD degradation ratio was 78% and biogas generation per fed COD was reached 0.38 Nm3/kg-fed COD at HRT of 10 days and SRT of 45 days. This result showed that the MBR treatment system are highly effective in treating POME and is feasible to be applied on an industrial scale. |
