title: Influence of substrate concentration and moisture content on the specific methanogenic activity of dry mesophilic municipal solid waste digestate spiked with propionate.
abstract: The objective of this study was to evaluate the influence of substrate concentration and 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 into glass bottles of 500 mL volume used as batch reactors, during a period of 20-25 days. Propionate was used as substrate at concentrations ranging from 1 to 10 gCOD/kg. Four moisture contents were studied: 65%, 75%, 80% and 82%. Experimental results showed that propionate concentration and moisture content strongly influenced the SMA. The highest SMA was observed at a substrate concentration of 10 gCOD/kg (11.3 mgCOD gVS(-1) d(-1) for the second dose of propionate) and at a moisture content of 82% (7.8 mgCOD gVS(-1) d(-1) for the second dose of propionate, at a concentration of 5 gCOD/kg). SMA was found to decrease linearly when decreasing the moisture content.
authors.affiliation: Université de Lyon, INSA-Lyon, LGCIE, 20 av. A. Einstein, F-69621 Villeurbanne cedex, France.
authors.forename: Ronan
authors.initials: R
authors.lastname: Le Hyaric
authors.forename: Caroline
authors.initials: C
authors.lastname: Chardin
authors.forename: Hassen
authors.initials: H
authors.lastname: Benbelkacem
authors.forename: Julien
authors.initials: J
authors.lastname: Bollon
authors.forename: Rémy
authors.initials: R
authors.lastname: Bayard
authors.forename: Renaud
authors.initials: R
authors.lastname: Escudié
authors.forename: Pierre
authors.initials: P
authors.lastname: Buffière
mesh_terms: D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D002947:Cities; D003890:Desiccation; D007700:Kinetics; D008697:Methane / Q000032:analysis*; D011422:Propionates / Q000032:analysis*; D012037:Refuse Disposal / Q000379:methods*; D014131:Trace Elements / Q000032:analysis; D014867:Water / Q000032:analysis*
chemical_list: D011422:Propionates; D014131:Trace Elements; D014867:Water; D008697:Methane