Anggit Raksajati
Palm Oil Mill (PKS) produces liquid waste in the form of palm oil mill effluent (POME), which is produced from condensate stew, hydrocyclone water, and sludge separator. POME needs to be processed because it contains organic carbon with a COD more than 40 g / L and a nitrogen content of about 0.2 and 0.5 g/L as ammonia nitrogen and total nitrogen. At present, one way to treat POME is by converting POME into biogas using anaerobic ponds. Biogas can be purified into biomethane through the technology of CO2 separation, for example by CO2 absorption using water. This study evaluates the optimum pressure and feed compression stage in biogas upgrading into biomethane. The evaluation was performed using Aspen Hysys V10 and Aspen Process Economic Analyzer V10. Biogas feed stream with the amount of 600 Nm3/hr is fed into one or two step(s) of compressor to increase the pressure up to 2-10 bar. The compressed biogas is then sent to the bottom of absorber column where it contacts with pressurized water sent from the top of the column. The clean biomethane gas (> 95% CH4) goes out from the top of the column, while the water containing absorbed CO2 and CH4 goes out from the bottom of the column. This liquid stream is then sent to a flash separator (for two stage compressor case) to separate CH4 vapor formed after the pressure letdown from the water and CO2 stream that is sent to the stripper column. In the stripper column, the liquid fed from the bottom contacts with air sent from the blower to strip the CO2 from water. The regenerated water is then sent back to the absorber through circulation pump and tank.
Penerapan Karya Tulis
Palm Oil Mill (PKS) produces liquid waste in the form of palm oil mill effluent (POME), which is produced from condensate stew, hydrocyclone water, and sludge separator. POME needs to be processed because it contains organic carbon with a COD more than 40 g / L and a nitrogen content of about 0.2 and 0.5 g/L as ammonia nitrogen and total nitrogen.