Process and installation for simultaneously producing compost and biogas from organic waste

Patent · Tue Dec 30 00:00:00 EST 1986

OSTI ID:6819857

Lebesgue, Y; Zeana, A

A process is described for the simultaneous treatment of solid or semi-solid organic waste and liquid organic waste with a view to the simultaneous production of compost and biogas, wherein the liquid organic waste is subjected to a liquid-solid separation. The liquid phase from this separation is subjected to anaerobic fermentation in at least one closed digester, the solid phase from the liquid-solid separation is mixed with the solid or semi-solid organic waste, and the resulting mixture is subjected to aerobic fermentation at the periphery of the digester and in contact therewith. Mud, clarified liquid and gas are respectively discharged from the digester whereas compost from the aerobic fermentation of the solid or semi-solid waste is recovered at the periphery of the digester wherein the digester is characterized by two superimposed compartments, an upper compartment at low pressure and a lower compartment at high pressure, the compartments communicating together through at least one lateral pipe and through a central siphon. A means is provided for lowering the pressure of the lower compartment when the liquid reaches a predetermined level therein. An installation is described for the simultaneous treatment of solid or semi-solid organic waste and liquid waste with a view to the simultaneous production of compost and biogas. This comprises: means for separating the liquid organic waste into a solid phase and a liquid phase; at least one closed digester; means for introducing the liquid phase into the digester; means for mixing the solid phase with the solid or semi-solid waste; means for bringing the resulting mixture to the periphery of the digester in contact therewith; and means for discharging respectively from the digester the gas which is formed therein by anaerobic fermentation and the sludges which are deposited therein.

• Assignee: Societe Multibio
• Patent Number(s): US 4632692
• OSTI ID: 6819857
• Resource Relation: Patent File Date: Filed date 24 Aug 1984
• Country of Publication: United States
• Language: English

Related Subjects

09 BIOMASS FUELS
COMPOST
BIOSYNTHESIS
METHANE
ORGANIC WASTES
ANAEROBIC DIGESTION
AEROBIC DIGESTION
BIOREACTORS
FERMENTATION
LIQUID WASTES
MIXING
MIXTURES
PRESSURE DEPENDENCE
SOLID WASTES
ALKANES
BIOCONVERSION
DIGESTION
DISPERSIONS
HYDROCARBONS
MANAGEMENT
ORGANIC COMPOUNDS
PROCESSING
SYNTHESIS
WASTE MANAGEMENT
WASTE PROCESSING
WASTES
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