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Dry anaerobic digestion of food waste and cardboard at different substrate loads, solid contents and co-digestion proportions

The increasing food waste production calls for developing efficient technologies for its treatment. Anaerobic processes provide an effective waste valorization. The influence of the initial substrate load on the performance of batch dry anaerobic co-digestion reactors treating food waste and cardboard was investigated. The load was varied by modifying the substrate to inoculum ratio (S/X), the total solids content and the co-digestion proportions. The results showed that the S/X was a crucial parameter. Within the tested values (0.25, 1 and 4gVS·gVS?1), only the reactors working at 0.25 produced methane. Methanosarcina was the main archaea, indicating its importance for efficient methanogenesis. Acidogenic fermentation was predominant at higher S/X, producing hydrogen and other metabolites. Higher substrate conversions (?48%) and hydrogen yields (?62mL·gVS?1) were achieved at low loads. This study suggests that different value-added compounds can be produced in dry conditions, with the initial substrate load as easy-to-control operational parameter.

» Author: Gabriel Capson-Tojo, Eric Trably, Maxime Rouez, Marion Crest, Jean-Philippe Steyer, Jean-Philippe Delgenčs, Renaud Escudié

» Reference: Bioresource Technology, Volume 233

» Publication Date: 01/06/2017

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This project has received funding from the European Union’s Horizon 2020 research and innovation program under grant agreement N° 690103