US 12,252,424 B2
Method and device for anaerobic digestion
Patrice Capeau, Saragossa (ES); and Pascal Gendrot, Mere (FR)
Assigned to Orege, Voisins-le-Bretonneux (FR)
Appl. No. 17/417,843
Filed by Orege, Voisins-le-Bretonneux (FR)
PCT Filed Dec. 24, 2019, PCT No. PCT/EP2019/087033
§ 371(c)(1), (2) Date Jun. 24, 2021,
PCT Pub. No. WO2020/136213, PCT Pub. Date Jul. 2, 2020.
Claims priority of application No. 1874158 (FR), filed on Dec. 26, 2018.
Prior Publication US 2022/0212969 A1, Jul. 7, 2022
Int. Cl. C02F 9/00 (2023.01); B01F 23/2326 (2022.01); B01F 25/312 (2022.01); B01F 101/00 (2022.01); C02F 1/20 (2023.01); C02F 1/24 (2023.01); C02F 1/56 (2023.01); C02F 11/04 (2006.01); C02F 11/123 (2019.01)
CPC C02F 9/00 (2013.01) [B01F 23/2326 (2022.01); B01F 25/31242 (2022.01); B01F 2101/305 (2022.01); B01F 2215/0422 (2013.01); B01F 2215/045 (2013.01); C02F 1/20 (2013.01); C02F 1/24 (2013.01); C02F 1/56 (2013.01); C02F 11/04 (2013.01); C02F 11/123 (2013.01); C02F 2301/046 (2013.01); C02F 2301/066 (2013.01); C02F 2303/06 (2013.01)] 18 Claims
OG exemplary drawing
 
1. 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.