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Biogas is an alternative energy that can be obtained from the anaerobic degradation process of organic matter. The high carbon dioxide (CO2) content in biogas needs to be reduced, even if it can be removed so that the quality and heat value of biogas increases. The water scrubbing method is a method that can be applied to reduce CO2 biogas. However, to get high-quality biogas using the water scrubbing method it is necessary to add external pressure and a high enough scrubber column. Besides, pressurized water scrubbing also requires a higher electricity cost (0.34 kWh m-3 of raw biogas) compared to water scrubbing at low or near atmospheric pressure (0.24 kWh m-3). In this research, simulation modelling was carried out using Aspen Plus to reduce CO2 biogas by water scrubbing at low pressure, using a packing sponge. The sensitivity of the system performance was tested against variations in column pressure, the number of scrubber stages, and the liquid-to-gas ratio (L/G ratio). The Aspen Plus simulation results show that that increasing the number of columns can reduce CH4 losses and optimal operation under low pressure conditions is achieved at a scrubber column pressure of 1.4atm with an L/G ratio of 10.5 in the design of the number of stage scrubber columns of 5 pieces with pure biogas production levels reached 96.7%.

Aspen Plus Simulation Model for Biogas CO2 Reduction with Low Pressure Water Scrubbing