Leachate flush strategies for managing volatile fatty acids accumulation in leach-bed reactors

Abstract : In anaerobic leach-bed reactors (LBRs) co-digesting an easily- and a slowly-degradable substrate, the importance of the leachate flush both on extracting volatile fatty acids (VFAs) at the beginning of newly-started batches and on their consumption in mature reactors was tested. Regarding VFA extraction three leachate flush-rate conditions were studied: 0.5, 1 and 2 L kg−1 TS d−1. Results showed that increasing the leachate flush-rate during the acidification phase is essential to increase degradation kinetics. After this initial phase, leachate injection is less important and the flush-rate could be reduced. The injection in mature reactors of leachate with an acetic acid concentration of 5 or 10 g L−1 showed that for an optimized VFA consumption in LBRs, VFAs should be provided straight after the methane production peak in order to profit from a higher methanogenic activity, and every 6–7 h to maintain a high biogas production rate.
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https://hal.archives-ouvertes.fr/hal-01605627
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Submitted on : Monday, October 2, 2017 - 9:53:39 PM
Last modification on : Wednesday, March 14, 2018 - 11:47:09 AM

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Silvio Riggio, Michel Torrijos, Guillaume Vives, Giovanni Esposito, Eric D. Van Hullebusch, et al.. Leachate flush strategies for managing volatile fatty acids accumulation in leach-bed reactors. Bioresource Technology, Elsevier, 2017, 232, pp.93-102. ⟨10.1016/j.biortech.2017.01.060⟩. ⟨hal-01605627⟩

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