Biochar addition with Fe impregnation to reduce H2S production from anaerobic digestion

[Display omitted] •Unmodified biochar added to a digester resulted in 90.5% H2S removal efficiency.•The biochar particle size did not significantly affect the H2S removal efficiency.•Iron-impregnated biochar resulted in complete removal of H2S from the biogas.•Activated carbon was not effective when...

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Veröffentlicht in:Bioresource technology 2020-06, Vol.306, p.123121-123121, Article 123121
Hauptverfasser: Choudhury, Abhinav, Lansing, Stephanie
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Sprache:eng
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Zusammenfassung:[Display omitted] •Unmodified biochar added to a digester resulted in 90.5% H2S removal efficiency.•The biochar particle size did not significantly affect the H2S removal efficiency.•Iron-impregnated biochar resulted in complete removal of H2S from the biogas.•Activated carbon was not effective when used as an in-situ desulfurization agent.•Biochar addition did not significantly affect the methane yield during digestion. Corn stover biochar (CSB) and maple biochar (MB) were added into anaerobic digesters and evaluated for hydrogen sulfide (H2S) reductions. This was the first study to show Fe-impregnated biochar can eliminate H2S production. The novel study evaluated biochar addition on H2S reduction and nutrient concentrations using three experiments to test the effect of: 1) biochar concentration, 2) biochar particle size, and 3) Fe-impregnated biochar using triplicate lab-scale reactors. At the highest biochar dose (1.82 g biochar/g manure TS), H2S production was 90.5% less than the control treatment (351 mL H2S/kg VS). Biochar particle size did not significantly affect H2S concentration. The Fe-impregnated biochar (0.5 g biochar/g manure TS) reactors had no H2S detected in the CSB-Fe system. Methane (CH4) in the biochar and control treatments were not significantly different in all three experiments. The results show that biochar added to digesters can significantly reduce H2S production without affecting CH4 production.
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2020.123121