In this study, the effects of recycle on anaerobic baffled reactor performances in treating palm oil mill effluents were investigated and biokinetic parameters were also determined. Recycle-ratio effect studies were carried out at the average loading rate of 15.6 g COD/l/d with the recycle rate varied from 5 to 25 times of the fresh-feed rate. The study shows that in the current system, a recycle of more than 15 times is needed to maintain the system pH higher than 6.8 without alkalinity supplementation, and the imposition of recycle is an effective means to reduce alkalinity requirements. Moreover, the kinetic model for substrate utilization and methane production proposed by Bathakur et al. (1991) was able to show the domination of certain culture in anaerobic processes. The model was also found to predict the experimental data of the present study with good accuracy.
Abstrak. Bioreaktor hibrid anaerob merupakan penggabungan antara sistem pertumbuhan tersuspensi dan pertumbuhan terlekat. Dalam penelitian ini media pelekatan mikroorganisma yang digunakan adalah batu. Larutan umpan dibuat dari molase yang diencerkan sebagai salah satu contoh air buangan dengan beban organik tinggi. Proses degradasi dilakukan dengan waktu detensi hidrolis 30 jam dan rasio tinggi bagian tersuspensi dan terlekat sebesar 1:2. Bioreaktor dioperasikan pada variasi konsentrasi organik 10.000, 20.000, 30.000 dan 40.000 mg/L COD. Hasil penelitian menunjukkan bahwa peningkatan konsentrasi organik mempengaruhi kinerja bioreaktor dan produksi metan sebagai hasil proses anaerob belum optimal.Abstract. Anaerobic hybrid bioreactor is a combination of suspended and attached growth systems. Stone was used as the microorganism attachment media. The feeding solution was made from molasses diluted to COD concentration of 10,000, 20,000, 30,000 and 40,000 mg/L. The hydraulic detention time was 30 hours and the height ratio between suspended and attached growth system was 0.5. The result shows that the organic concentration seems to be on of the determining factors. Furthermore, since the methane production was still low enough, it seems that the process has not achieved its optimum condition for methanogenic stage.
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