US 7,320,753 B2
Anaerobic digester system for animal waste stabilization and biogas recovery
Kurt Frederich Roos, Dumfries, Va. (US)
Assigned to The United States of America as represented by the United States Environmental Protection Agency, Washington, D.C. (US)
Filed on Mar. 05, 2007, as Appl. No. 11/682,086.
Application 11/682086 is a continuation of application No. 11/381967, filed on May 05, 2006, granted, now 7,186,339, filed on Mar. 06, 2007.
Prior Publication US 2007/0256971 A1, Nov. 08, 2007
Int. Cl. C02F 3/28 (2006.01)
U.S. Cl. 210—603  [210/916; 435/262.5] 15 Claims
OG exemplary drawing
 
1. A method for anaerobically digesting dilute animal waste with biogas production, comprising the steps of:
Conveying dilute animal waste containing through one or more waste inlets in a substantially flexible bladder;
Maintaining the dilute animal waste in the substantially flexible bladder at an average ambient temperature of 65 degrees Fahrenheit or greater for a period of time for digestion of the dilute animal waste;
Removing digester effluent from the substantially flexible bladder through one or more digester effluent outlets in the substantially flexible bladder;
Providing a displacement tank in fluid communication with at least one of the one or more digester effluent outlets; and
Storing biogas within the substantially flexible bladder by displacing animal waste therein through the at least one of the one or more digester effluent outlets into the displacement tank.