Method and device for anaerobic digestion

A methanization process, starting from an organic liquid sludge, comprising:

• creating an hydrolyzed sludge emulsion by performing a first cycle followed by at least 6 additional cycles, wherein:
• the first cycle comprises:
• blasting the organic liquid sludge with gas by injecting the gas into the organic liquid sludge to obtain an hydrolyzed sludge;
• supplying the hydrolyzed sludge to a pressurized reactor;
• and evacuating the hydrolyzed sludge from the pressurized reactor via a member that generates a pressure drop in the hydrolyzed sludge;
• each of the at least 6 additional cycles comprises blasting the hydrolyzed sludge, evacuated from the reactor in an immediately preceding cycle, with the gas by injecting the gas into that hydrolyzed sludge;
• supplying, to the pressurized reactor, the blasted hydrolyzed sludge;
• and evacuating, via the member that generates the pressure drop, the hydrolyzed sludge from the pressurized reactor;
• the pressurized reactor is supplied via an element of diameter d through which the liquid sludge flows, during the first cycle, and through which the hydrolyzed sludge flows, during the at least 6 additional cycles, at a first velocity v>10 m/s, at a first pressure p, and at a flow rate Q;
• the gas is injected, at a flow rate q Nm3≥10 Q m3, to create, as the blasted organic liquid sludge, or to further create, as the blasted hydrolyzed sludge, a compressible gaseous emulsion that is supplied to the reactor;
• the reactor has a diameter D>20 d and is at a second pressure P>p;
• and
• the compressible gaseous emulsion flows through the reactor at a second velocity V<v;
• and
• digesting, in a digester after performance of a last of the at least 6 additional cycles, the hydrolyzed sludge emulsion, wherein the digesting comprises:
• hydrolysis/acidogenesis of the hydrolyzed sludge emulsion;
• acetogenesis for production of acetate from the hydrolyzed sludge emulsion;
• and methanogenesis starting from the acetates in order to produce methane.