Comparison of the mesophilic and thermophilic anaerobic digestion of spent cow bedding in leach-bed reactors.
Anaerobic digestion of spent cow bedding in batch leach-bed reactors (LBRs) was compared in mesophilic and thermophilic conditions for the first time. Results show that the use of thermophilic conditions enhanced only the degradation kinetics of easily-degradable matter during the first days of the digestion, whereas similar methane yields (80% of the Biomethane Potential) were reached after 42days at both temperatures. Therefore, the anaerobic digestion in LBRs of spent cow bedding, a substrate rich in slowly-degradable compounds, was not improved in term of methane production considering the overall digestion time. Moreover, the high initial biogas production rate in thermophilic reactors was found to significantly reduce the energetic performance of the cogeneration unit at industrial scale, leading to a 5.9% decrease in the annual electricity production when compared to a mesophilic one.
LBE, INRA, 102 avenue des Etangs, 11100 Narbonne, France; Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Via Di Biasio, 43, 03043 Cassino (FR), Italy; Université Paris-Est, Laboratoire Géomatériaux et Environnement (LGE), EA 4508, UPEM, 77454 Marne-la-Vallée, France.
S
S
Riggio
Naskeo Environnement, 52 rue Paul Vaillant Couturier, 92240 Malakoff, France.
M A
MA
Hernandéz-Shek
LBE, INRA, 102 avenue des Etangs, 11100 Narbonne, France.
M
M
Torrijos
Naskeo Environnement, 52 rue Paul Vaillant Couturier, 92240 Malakoff, France.
G
G
Vives
Department of Civil and Mechanical Engineering, University of Cassino and Southern Lazio, Via Di Biasio, 43, 03043 Cassino (FR), Italy.
G
G
Esposito
Université Paris-Est, Laboratoire Géomatériaux et Environnement (LGE), EA 4508, UPEM, 77454 Marne-la-Vallée, France.
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ED
van Hullebusch
LBE, INRA, 102 avenue des Etangs, 11100 Narbonne, France.
J P
JP
Steyer
LBE, INRA, 102 avenue des Etangs, 11100 Narbonne, France. Electronic address: renaud.escudie@inra.fr.
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R
Escudié
D000693:Anaerobiosis; D000818:Animals; D056804:Biofuels / Q000032:analysis; D019149:Bioreactors; D002417:Cattle; D007700:Kinetics; D008697:Methane / Q000032:analysis / Q000378:metabolism; D059013:Microbial Consortia; D013696:Temperature; D014866:Waste Products / Q000032:analysis
D056804:Biofuels; D014866:Waste Products; D008697:Methane
Discontinuous biogas production; Dry anaerobic digestion; Electric energy production; Leach-bed reactor (LBR); Thermophilic temperature