Effect of various leachate recirculation strategies on batch anaerobic digestion of solid substrates
by Sigrid Kusch; Hans Oechsner; Thomas Jungbluth
International Journal of Environment and Waste Management (IJEWM), Vol. 9, No. 1/2, 2012

Abstract: Various leachate recirculation strategies were applied to a batch-wise operated solid-phase digestion system in laboratory-scale tests. Comparative experiments with both continuous and intermittent leachate recirculation revealed no advantages of a continuous flow. Results suggest that leachate recirculation should not be carried out continuously during process initialisation when methanogenesis is the rate-limiting step. Continuous watering resulted in the accumulation of Volatile Fatty Acids (VFA) during process start-up. In addition, no need for continuous water circulation was found for the following digestion process when hydrolysis was rate-limiting. Even in the absence of liquid recirculation, degradation was only slightly retarded when the biomass moisture content was adjusted.

Online publication date: Sat, 13-Dec-2014

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