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The paper presents aspects related to the performance of an anoxic biotrickling fi lter designed for hydrogen sulphide (H 2 S) removal from biogas. In this process, nitrate was supplied through a nutrient solution as an electron acceptor for anoxic growth of H 2 S-oxydizing microorganisms. The biotrickling fi lter’s packing media consisted of a layer of plastic fi bres over volcanic rocks in a ratio 0.78:1 by volume. The total volume of packing media was 0.014 m 3 . Several H 2 S loading rates (IL) were tested under continuous dynamic conditions, ranging between 20 and 550 g of H 2 S feed/(m 3 bed·day). Maximum process performance (>95%) was observed for IL ranging up to approximately 300 g of H 2 S feed/(m 3 bed·day). The degradation of hydrogen sulphide occurred with the formation of both sulphate and elemental sulphur, their formation ratio being dependent on H 2 S loading rate. Elemental sulphur was found to be the dominant degradation product, particularly at IL > 96.18 g of H 2 S feed/( m 3 bed·day). The use of two biotrickling fi lters in series was also tested, and a signifi cant improvement in process performance was observed. This technology allows simple operation with low maintenance and has the potential for sulphur recovery.

Study on the Performance of an Anoxic Biotrickling Filter for the Removal of Hydrogen Sulphide from Biogas