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1. (WO2010120173) PROCESS FOR PRODUCING METHANE FROM BIOMASS

Pub. No.:    WO/2010/120173    International Application No.:    PCT/NL2010/050193
Publication Date: Fri Oct 22 01:59:59 CEST 2010 International Filing Date: Fri Apr 16 01:59:59 CEST 2010
IPC: C12P 5/02
C12M 1/107
Applicants: KONINKLIJKE COÖPERATIE COSUN U.A.
RAAP, Johannes Franciscus Maria
BROOIJMANS, Petrus Wilhelmus Alphonsus Maria
Inventors: RAAP, Johannes Franciscus Maria
BROOIJMANS, Petrus Wilhelmus Alphonsus Maria
Title: PROCESS FOR PRODUCING METHANE FROM BIOMASS
Abstract:
The invention pertains to a process for producing methane by a two-stage anaerobic digestion of organic feed, comprising i) subjecting an organic feed suspension (a) to acidogenesis and methanogenesis in a first reactor (1); ii) withdrawing an effluent (b) from said first reactor and subjecting it to solid/liquid separation (2), thus obtaining effluents high (d) and low (c) in solids, wherein the volatile fatty acid (VFA) concentration in said first reactor is controlled by the withdrawal rate; iii) subjecting the effluent low in solids (c) to acidogenesis and methanogenesis in a second reactor (3), thus producing methane gas in said first and second reactor.