Influence of moisture content on the specific methanogenic activity of dry mesophilic municipal solid waste digestate
2012
Le Hyaric, Ronan | Benbelkacem, Hassen | Bollon, Julien | Bayard, Rémy | Escudie, Renaud, R. | Buffiere, Pierre | Université de Lyon | Laboratoire de Biotechnologie de l'Environnement [Narbonne] (LBE) ; Institut National de la Recherche Agronomique (INRA)-Institut national d’études supérieures agronomiques de Montpellier (Montpellier SupAgro) | ANR (French National Research Agency) [ANR-08-BIOE-009-03] | ANR-08-BIOE-0009,ANAMIX,Caractérisation des paramètres rhéologiques et des transferts pour l'amélioration des procédés de méthanisation par voie sèche(2008)
International audience
Mostrar más [+] Menos [-]Inglés. The objective of this study was to evaluate the influence of moisture content on the specific methanogenic activity (SMA) of a fresh dry mesophilic digestate from a municipal solid waste digester plant. For this purpose, SMA tests were performed under mesophilic conditions in 500 mL glass bottles of volume used as batch reactors, during a period of 2025 days. Cellulose, propionate and acetate were used as substrates (5 gCOD kg-1 digestate) at four different moisture contents, ranging from 65 to 82%. The moisture content strongly influenced the specific methanogenic activity. The highest SMA values were observed at a moisture content of 82% (11.1, 7.8 and 6.0 mgCOD gVS-1 d-1 for cellulose, propionate and acetate spikes, respectively). SMA and moisture content were found to be linearly linked. Dry digestion at low water content is thus detrimental to the biological activity, probably due to physical limitations.
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