NOVELTY - Animal waste is treated by flushing waste from animal housing unit to an enclosed anaerobic digester and treating a liquid portion of digested waste with an aerobic digestion. A clarified liquid is used to flush additional waste from the housing animal unit into the anaerobic digester and restart the cycle.    USE - For treating animal waste generated in hog nursery barn.    ADVANTAGE - The inventive process provides economical handling of animal waster from an intense feeding operation that does not utilize open lagoons and that does not result in offensive odors from infrequent flushing of feeding/growing hogs. It provides total management of liquid and solid animal wastes to control odor emissions and to prevent pollution of land and water resources. It provides 60% dry weight reduction in solid wastes and transformed remaining solids not to produce intense odors.    DETAILED DESCRIPTION - Treatment of animal waste involves flushing liquid and solid waste from an animal housing unit into closed anaerobic digester(s) for anaerobic digestion of the waste. Portion of the waste is moved from the anaerobic digester to an anaerobic solids concentrator to allow the solid separates from the liquid to obtain a first clarified liquid portion. Portion of the sludge from the anaerobic solids concentrator is returned to the digesters. The first clarified liquid portion is moved to an aerobic sludge reactor and incubated under aerobic conditions. The solids are allowed to separate from the liquids in an aerobic sludge clarifier to obtain a second clarified liquid portion. Portion of the second clarified liquid is used to flush additional solid and liquid waste from the housing unit into the anaerobic digester to restart the cycle.    An INDEPENDENT CLAIM is also included for a system for treating animal waste from an animal feeding/rearing barn comprising enclosed aerobic digester(s) connected with the barn, or reservoir or wet well connected to the barn for anaerobic fermentation; enclosed anaerobic solids concentrator(s) for anaerobic solids concentration connected with the digesters; aerobic sludge reactor(s) for aerobic sludge reaction connected with the solids concentrators; complete mix anaerobic digester(s) for aerobic reaction/concentration connected with the aerobic sludge reactors; and an outlet connected with primary digesters to transport a clarified liquid for flushing the waste from the barn into the anaerobic fermentation.    DESCRIPTION OF DRAWING(S) - The figure is a flow diagram of the inventive process.