Dynamic effect of leachate recirculation on batch mode solid state anaerobic digestion: Influence of recirculated volume, leachate to substrate ratio and recirculation periodicity. (September 2016)

• Record Type: Journal Article
• Authors: Degueurce, Axelle; Trémier, Anne; Peu, Pascal
• Is Part Of: Bioresource technology. Volume 216(2016)
• Page Start: 553
• Page End: 561
• Publication Date: 2016-09
• Subjects: Leach bed reactor -- Methane production kinetics -- Experimental design -- Cattle manure; Biomass -- Periodicals; Biomass energy -- Periodicals; Bioremediation -- Periodicals; Agricultural wastes -- Periodicals; Factory and trade waste -- Periodicals; Organic wastes -- Periodicals; Bioénergie -- Périodiques; Déchets agricoles -- Périodiques; Déchets industriels -- Périodiques; Déchets organiques -- Périodiques; Déchets (Combustible) -- Périodiques; 662.88
• DOI: 10.1016/j.biortech.2016.05.113
• Languages: English
• ISSNs: 0960-8524

Abstract

Highlights: The periodicity of leachate recirculation has the most influence during SSAD. A long period without recirculation reduces moisture and therefore SSAD performance. Volumes of recirculated leachate can counteract the effect of periodicity. High L:S ratios dilute nutrients and metabolites. Several recirculation practices lead to similar SSAD performances. Abstract: Performances of batch mode solid state anaerobic digestion (SSAD) were investigated through several leachate recirculation strategies. Three parameters were shown to particularly influence methane production rates (MPR) and methane yields: the length of the interval between two recirculation events, the leachate to substrate (L:S) ratio and the volume of leachate recirculated. A central composite factor design was used to determine the influence of each parameter on methane production. Results showed that lengthening the interval between two recirculation events reduced methane yield. This effect can be counteracted by recirculating a large volume of leachate at a low L:S ratio. Steady methane production can be obtained by recirculating small amounts of leachate, and by lengthening the interval between two recirculations, regardless of the L:S ratio. However, several combinations of these parameters led to similar performances meaning that leachate recirculation practices can be modified as required by the specific constraints SSAD plants configurations.