Patent ID: 6860997
Filing Date: 2005-03-01
Classification: C02F,Y10S

Abstract:
1. An anaerobic digester comprising: a first covered fluid containment means comprising a first upper section and a first lower section, an aqueous slurry comprising anaerobically digestible fiber disposed within the first covered containment means; a second covered fluid containment means disposed within the first covered containment means, the second covered fluid containment means comprising a second upper section and a second lower section; the second upper section comprising a first fluid inlet for receiving fluid flow from the first upper section of the first covered fluid containment means, the first fluid inlet having a screen disposed at the interface of the first covered fluid containment means and the second covered fluid containment means, the screen adapted for formation of a filter cake thereon upon fluid flow from the first covered fluid containment means through the first fluid inlet into the second covered containment means, said filter cake comprising said fiber; said second upper section comprising a first gas outlet and said second lower section comprising a first liquid outlet; circulating means for circulating the aqueous slurry through the first covered fluid containment means; gas processing means for receiving and processing gas from the first gas outlet; and liquid processing means for receiving liquid from the first liquid outlet.