Combined liquid to solid-phase anaerobic digestion for biogas production from municipal and agricultural wastes

摘要

Biogas is obtained in a solid-state anaerobic digester from a solid organic biomass and a digestion effluent produced in an associated liquid anaerobic digester. The solid organic biomass and digestion effluent are mixed to produce an effluent-biomass mixture. The effluent-biomass mixture is then incubated in the solid state anaerobic digester, producing a biogas and a digestate. The incubation is controlled by adjusting the composition and properties of the effluent-biomass mixture. The solid organic biomass may comprise lignocellulosic biomass, food waste, agricultural waste and the like.

主权项

1. A method of controlling the production of biogas from both solid and liquid organic biomass, comprising the steps of:
generating an effluent from the liquid organic biomass in a first vessel, operating as a liquid anaerobic digester; combining the effluent with the solid organic biomass, producing an effluent-biomass mixture; incubating, in a second vessel, operating as a solid waste digestion reactor, the effluent-biomass mixture to produce a biogas and a digestate; and controlling, by use of the effluent, the incubating step in the second vessel wherein the first and second vessels are in fluid communication or in series communication with each other by a conduit that connects an outlet of the first vessel to an inlet of the second vessel, the conduit also having an inlet along the conduit to admit the solid organic biomass for the combining step and to deliver the effluent-biomass mixture to the second vessel.