Two-phase anaerobic digestion of carbonaceous organic materials

C - Chemistry – Metallurgy – 02 – F

Patent

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C02F 11/04 (2006.01) C02F 3/28 (2006.01)

Patent

CA 2180016

A process for improved methane production by two-phase anaerobic digestion of organic carbonaceous material in which organic carbonaceous material is fermented under anaerobic conditions in an acid phase digester, forming a liquid/solids effluent, the liquid/solids effluent is fermented under anaerobic conditions in a methane phase digester, product gas comprising methane is withdrawn from the methane phase digester, and oxygen is introduced into the methane phase digester. In a preferred embodiment, the methane phase liquid effluent is passed through a CO2 stripper resulting in stripping of CO2 and H2S from the methane phase liquid effluent. The resulting stripper liquid effluent comprising dissolved oxygen is then recycled back to the methane phase digester.

L'invention a pour objet un procédé servant à améliorer la production de méthane par digestion anaérobie en deux phases d'une matière organique carbonée. A cet effet, la matière organique carbonée fermente dans des conditions anaérobies dans un digesteur en phase acide, puis forme un effluent liquide/solide fermentant lui-même dans des conditions anaérobies dans un digesteur en phase méthane. Le gaz produit renfermant du méthane est retiré du digesteur en phase méthane dans lequel est introduit de l'oxygène. Selon un mode préféré de réalisation, l'effluent liquide en phase méthane passe par une colonne de stripping de CO¿2? entraînant l'extraction du CO¿2? et du H¿2?S de l'effluent liquide en phase méthane. L'effluent liquide obtenu après stripping contient de l'oxygène dissous et est ensuite recyclé dans le digesteur en phase méthane.

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