1. Similar evolution in δ 13CH4 and model-predicted relative rate of aceticlastic methanogenesis during mesophilic methanization of municipal solid wastes
- Author
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V A, Vavilin, X, Qu, L, Mazéas, M, Lemunier, C, Duquennoi, J M, Mouchel, P, He, and T, Bouchez
- Subjects
China ,Environmental Engineering ,Methanogenesis ,Population ,0207 environmental engineering ,02 engineering and technology ,Acetates ,010501 environmental sciences ,01 natural sciences ,Methane ,chemistry.chemical_compound ,Total inorganic carbon ,Anaerobiosis ,020701 environmental engineering ,education ,0105 earth and related environmental sciences ,Water Science and Technology ,Carbon Isotopes ,education.field_of_study ,biology ,Chemistry ,Environmental engineering ,Methanosarcina ,Methanosarcinales ,Models, Theoretical ,biology.organism_classification ,Refuse Disposal ,Anaerobic digestion ,Biodegradation, Environmental ,13. Climate action ,Environmental chemistry ,Carbon dioxide ,France ,Mesophile - Abstract
Similar evolution was obtained for the stable carbon isotope signatures delta (13)CH(4) and the model-predicted relative rate of aceticlastic methanogenesis during mesophilic methanization of municipal solid wastes. In batch incubations, the importance of aceticlastic and hydrogenotrophic methanogenesis changes in time. Initially, hydrogenotrophic methanogenesis dominated, but increasing population of Methanosarcina sp. enhances aceticlastic methanogenesis. Later, hydrogenotrophic methanogenesis intensified again. A mathematical model was developed to evaluate the relative contribution of hydrogenotrophic and aceticlastic pathways of methane generation during mesophilic batch anaerobic biodegradation of the French and the Chinese Municipal Solid Wastes (FMSW and CMSW). Taking into account molecular biology analysis reported earlier three groups of methanogens including strictly hydrogenotrophic methanogens, strictly aceticlastic methanogens (Methanosaeta sp.) and Methanosarcina sp., consuming both acetate and H(2)/H(2)CO(3) were considered in the model. The total organic and inorganic carbon concentrations, methane production volume, methane and carbon dioxide partial pressures values were used for the model calibration and validation. Methane isotopic composition (delta (13)CH(4)) evolution during the incubations was used to independently validate the model results. The model demonstrated that only the putrescible solid waste was totally converted to methane.
- Published
- 2009