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The Selective Removal of H2S over CO2 from Biogas in a Bubble Column Using Pretreated Digester Effluent

Published by the American Society of Agricultural and Biological Engineers, St. Joseph, Michigan

Citation:  Paper number  131618714,  2013 Kansas City, Missouri, July 21 - July 24, 2013. (doi: @2013
Authors:   Nicholas Kennedy, Quan-Bao Zhao, Craig Frear, Shulin Chen
Keywords:   H2S removal biogas purification anaerobic digestion bubble column reactor absorption

Abstract. Raw biogas purification can be achieved using various physicochemical techniques. Unfortunately, techniques for the simultaneous absorption of CO2 and H2S are susceptible to the corrosive nature of H2S. Furthermore, the absorbents utilized are often expensive, thus requiring regeneration. Concurrently, on farm digesters are now moving towards the incorporation of NH3 recovery. One such process, air stripping, requires elevation of pH and production of an alkaline effluent. Therefore, a physicochemical H2S removal process was investigated in a bubble column reactor using this alkaline absorbent. Selective removal of H2S over CO2 increased nearly 50% by altering the sparger configuration. Further selectivity was achieved by decreasing the effluent height in the bubble column and increasing the superficial gas velocity. Continuous countercurrent mode of operation was tested and relatively high H2S removal efficiency (84%) was achieved at a biogas‑to‑effluent ratio (v/v) of 20:1, close to that typically found on digesters.

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