Improved organic matter biodegradation through pulsed H2 injections during in situ biomethanation - INRAE - Institut national de recherche pour l’agriculture, l’alimentation et l’environnement
Journal Articles Bioresource Technology Year : 2024

Improved organic matter biodegradation through pulsed H2 injections during in situ biomethanation

Abstract

During in situ biomethanation, microbial communities can convert complex Organic Matter (OM) and H 2 into CH 4 . OM biodegradation was compared between Anaerobic Digestion (AD) and in situ biomethanation, in semicontinuous processes, using two inocula from the digester (D) and the post-digester (PoD) of an AD plant. The impact of H 2 on OM degradation was assessed using a fractionation method. Operational parameters included 20 days of hydraulic retention time and 1.5 g VS .L- 1 .d- 1 of organic loading rate. During in situ biomethanation, 485 NmL of H 2 were injected for each feeding (3 times a week). Maximum organic COD removal was 0.6 gCOD in AD control and at least 1.6 gCOD for in situ biomethanation. Therefore, COD removal was 2.5 times higher with H 2 injections. These results bring out the potential of H 2 injections during AD, not only for CO 2 consumption but also for better OM degradation.
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hal-04677859 , version 1 (26-08-2024)

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M Mahieux, Quentin Aemig, Charlotte Richard, Jean-Philippe Delgenès, Marine Juge, et al.. Improved organic matter biodegradation through pulsed H2 injections during in situ biomethanation. Bioresource Technology, 2024, 407, pp.131101. ⟨10.1016/j.biortech.2024.131101⟩. ⟨hal-04677859⟩
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