Patent ID: 8969032
Filing Date: 2015-03-03
Classification: C12M,C12P,Y02E,Y02P

Abstract:
1. A method for obtaining biogas in two or more stages by hydrolysis of solid biogenic material in at least two percolators operated at offset times, comprising a hydrolysis stage and a methane stage, the method comprising: hydrolyzing biogenic material in the hydrolysis stage to form in the percolator liquid hydrolysate and hydrolysis gas, at first CO removing the hydrolysate from the percolators and collecting the hydrolysate, feeding one part of the hydrolysate into the methane stage and feeding the other part of the hydrolysate into the hydrolysis stage, converting the hydrolysate in the methane stage into biogas and fermentation liquid by methane-forming microorganisms, removing the fermentation liquid from the methane reactor and collecting the fermentation liquid and optionally feeding the fermentation liquid into the hydrolysis stage, operating the percolators gas-tightly, and drawing hydrolysis gas off from the percolators, using methane-containing hydrolysis gas for energy recovery, and using CO