METHOD FOR PRODUCING BIOGAS, WHICH CONTAINS METHANE, FROM ORGANIC SUBSTANCES.

摘要

Production of a methane-containing gas comprises aerobically digesting organic materials, carbonizing the residue to produce char, and anaerobically fermenting the carbonization off-gas with thermophilic methanogenic microorganisms. Production of a methane-containing gas (12) from organic materials (1) comprises: (a) subjecting the materials to aerobic digestion (4) with microorganisms to produce a solid and/or liquid residue (5) and a waste gas (6) containing carbon dioxide (CO2); (b) subjecting the residue to low-temperature carbonization (7) to produce char (8) and off-gas (9); and (c) subjecting the off-gas to anaerobic fermentation (11) with thermophilic methanogenic microorganisms. An Independent claim is also included for apparatus for carrying out the process, comprising an aerobic digester, a carbonization reactor and a methanogenic fermenter.