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

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.