Methane production improvement by modulation of solid phase immersion in dry batch anaerobic digestion process: dynamic of methanogen populations

Laura André (1, 2) , Mamadou Ndiaye (1) , Morgane Pernier (1) , Olivier Lespinard , André Pauss (2) , Edvina Lamy (2) , Thierry Ribeiro (1)

1 Institut Polytechnique LaSalle Beauvais
2 TIMR - Transformation Intégrée de la Matière Renouvelable

Several 60 L dry batch anaerobic digestion (AD) reactors were implemented with or without liquid reserve on cattle manure. The immersed part modulation of cattle manure increased the methane flow of about 13%. The quantitative real time PCR and the optimized DNA extraction were implemented and validated to characterize and quantify the methanogen dynamic in dry batch AD process. Final quantities of methanogens converged toward the same level in several inocula at the end of AD. Methanogen dynamic was shown by dominance of Methanosarcinaceae for acetotrophic methanogens and Methanobacteriales for the hydrogenotrophic methanogens. Overall, methanogens populations were stabilized in liquid phase, except Methanosaetaceae. Solid phase was colonized by Methanomicrobiales and Methanosarcinaceae populations giving a support to biofilm development. The methane increase could be explained by a raise of Methanosarcinaceae population in presence of a total contact between solid and liquid phases. Methanosarcinaceae was a bio-indicator of the methane production.

Mots clés: Dry batch anaerobic digestion; Methane production; Quantitative real-time PCR; 16S rRNA; Methanogenic populations

Domaines: Sciences de l'environnement

Laura André, Mamadou Ndiaye, Morgane Pernier, Olivier Lespinard, André Pauss, et al.. Methane production improvement by modulation of solid phase immersion in dry batch anaerobic digestion process: dynamic of methanogen populations. Bioresource Technol., 2016, 207, pp.353--360. ⟨10.1016/j.biortech.2016.02.033⟩. ⟨hal-02016039⟩