Patent ID: 6551510
Filing Date: 2003-04-22
Classification: C02F,Y02E

Abstract:
Method for treatment of organic material, grown for energy production or being organic waste which is slurried, suspended or dissolved in liquid, in a two-step anaerobic biochemical reactor configuration comprising recirculation between two reactors, and where the organic material is fed to a first reactor where hydrolysis and dissolution of the organic material takes place, resulting in formation of volatile fatty acids, and transfer of liquid material from the first reactor to a second, methanogenesis reactor where the treatment is finalized,wherein the amount of volatile fatty acid in each reactor is forced to oscillate within pre-set upper and lower limits by pulsed recirculation between the two reactors, whereby the amounts of fatty acid in the reactors are controlled by switching on the recirculation when the pH in the first reactor reaches a predetermined lower level and when the pH passes a predetermined upper level the recirculation will be switched off.