In the development of this paper experiments were conducted to investigate the removal of H2S from biogas stream by means of an absorption process with chemical reaction with a 0.4M Fe/EDTA solution. Experimental tests were carried out at 25ºC with an interval of catalytic solution from 22 to 250 mL/min, and gas outflow at 265 mL/min. For these conditions, it was determined the optimal value of liquid flowrate to reach high H2S removals from biogas and it was analyzed the sulfur particle formed during chemical reaction. Bubbling columns made of plastic acrylic having 36.0 cm height and 5.0 cm internal diameter were used. The results showed that the optimal contacting ratio of gas to liquid flowrates for efficient removal of H2S from biogas treated with Fe/EDTA solutions should be greater than 0.46.
biogas; sulfidric acid; chemical absorption; Fe/EDTA
