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Sulphur fate and anaerobic biodegradation potential during co-digestion of seaweed biomass (Ulva sp.) with pig slurry

Abstract : Seaweed (Ulva sp.) stranded on beaches were utilized as co-substrate for anaerobic digestion of pig slurry in three-month co-digestion tests in pilot scale anaerobic digesters in the laboratory. The methanogenic potential of Ulva sp. was low compared to that of other potential co-substrates available for use by farmers: 148 Nm3CH4/t of volatile solids or 19 Nm3CH4/t of crude product. When used as a co-substrate with pig manure (48%/52% w/w), Ulva sp. seaweed did not notably disrupt the process of digestion; however, after pilot stabilisation, biogas produced contained 3.5% H2S, making it unsuitable for energy recovery without treatment. Sequentially addition of the sulphate reduction inhibitor, potassium molybdate, to a final concentration of 3 mM, temporarily reduced H2S emissions, but was unable to sustain this reduction over the 3-month period. According to these pilot tests, the use of seaweed stranded on beaches as co-substrate in farm-based biogas plants shows some limitations.
Mots-clés : SULFURE D'HYDROGENE
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https://hal.inrae.fr/hal-02595628
Contributor : Migration Irstea Publications <>
Submitted on : Friday, May 15, 2020 - 8:14:03 PM
Last modification on : Friday, February 12, 2021 - 3:33:52 AM

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Pascal Peu, J.F. Sassi, R. Girault, S. Picard, Fabrice Béline, et al.. Sulphur fate and anaerobic biodegradation potential during co-digestion of seaweed biomass (Ulva sp.) with pig slurry. Bioresource Technology, Elsevier, 2011, 102 (23), pp.10794-10802. ⟨10.1016/j.biortech.2011.08.096⟩. ⟨hal-02595628⟩

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