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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Environmental EngineeringOrigin | Publication funded by an institution |
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