Patent ID: 6555359
Filing Date: 2003-04-29
Classification: C02F,C05F,C12M,Y02P,Y02W,Y10S

Abstract:
A process for the biological treatment of organic waste comprising:a) contacting organic solids in a closed vessel with a liquid containing anaerobic microorganisms, the solids forming particles for supporting and entrapping the bacteria and the solids being digested by the microorganisms and being buoyed in the liquid by the gases generated during such digestion so as to form a floating bed wherein an upper stratum of the bed contains the least digested and least dense material and a lower stratum of the bed contains the most digested and densest material; b) circulating liquid from beneath the floating bed to the upper surface of the floating bed and allowing the liquid to percolate down through the bed; c) moving the floating bed from an inlet end of the vessel to an opposite outlet end of the vessel; and d) removing the most digested, most dense material from the vessel at the outlet end.