Abstract
Hydrogen sulfide (H2S) causes maintenance issues in anaerobic digesters (AD). This study investigates the feasibility of biochar to reduce H2S in biogas produced from manure-based ADs. Two experiments were conducted where (1) biochar, steam treated wood, and raw wood produced from poplar wood chips were added to a respirometer system and the H2S reduction measured, and (2) biochar sulfate (SO42−) adsorption was investigated as a potential mechanism for H2S reduction. Results indicate that poplar wood biochar additions (3 g of biochar per 500 g of manure) reduced the H2S in biogas by 78% per g of TS fed, but did not impact methane (CH4) production. The second experiment indicates biochar sorption of SO42− before conversion to H2S by sulfur reducing bacteria (SRB) is not the primary removal mechanism, suggesting other mechanisms such as SRB inhibition, direct sorption of H2S, or increased dissociation of H2S to HS− drive the H2S reduction.
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