Abstract
This article describes how biofuel for vehicles was obtained from the biogas produced during the anaerobic digestion process at a wastewater treatment plant, and analyzes the extraction of CO2 by chemical absorption with mono-ethanol-amine at 20%. This research study tested the viability of a low pressure process (1.250 bar) for treating biogas with a high CO2 content (approximately 40%). The pilot plant used in this study was of sufficient size to treat a biogas volume of 10 m3/h. The inflowing biogas had been previously treated by chemical desulphurization using scrubbing towers and activated carbon. These processes had removed the sulphur compounds and other trace components in the biogas. The results obtained indicated the optimal amine quantity and scrubbing tower volume, as well as the temperature necessary to make the desorption process for amine regeneration most effective. When this process was optimized, the outflowing biogas had a mean CO2 concentration of 0.1%.
Published Version
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