NOVELTY - Wastewater is treated by moving part of solids portion to an anaerobic digester containing anaerobic culture(s) that reduces the organic content of the solids portion and produces a biogas comprising methane and/or carbon dioxide and/or hydrogen sulfide. A portion of the wastewater from the anaerobic digester that has undergone an anaerobic digestion is moved to the lagoon for a further treatment.    USE - For the treatment of wastewater including agricultural and industrial wastewater.    ADVANTAGE - The treatment of wastewater by the inventive method reduces the solids contained in the wastewater thus reducing the biological oxygen demand and chemical oxygen demand of the wastewater and reducing the amount of oxygen necessary to maintain aerobic processes. The maintenance of an aerobic treatment process reduces unpleasant odors and toxicity and makes the further use of the wastewater more practical for other operations including fertilization.    DETAILED DESCRIPTION - Treatment of wastewater comprises providing a source of wastewater that comprises animal feces with organic carbon component(s) a portion of which is an insoluble solid and a nitrogenous waste. The wastewater is introduced into an inlet of a clarifier having a top edge and a bottom. The wastewater is clarified to partially separate the wastewater into a clear water portion at or near the top edge of the clarifier and the solids are partially concentrated into a solids portion at or near the bottom of the clarifier. A part of the clear water portion is removed to a lagoon for nitrification and/or denitrification and/or a biological reduction of carbon. A part of the solids portion is moved to an anaerobic digester for treatment. The digester contains anaerobic culture(s) that reduces the organic content of the solids portion and produces a biogas comprising methane and/or carbon dioxide and/or hydrogen sulfide. A portion of the wastewater from the anaerobic digester that has undergone an anaerobic digestion is moved to the lagoon for a further treatment.    An INDEPENDENT CLAIM is also included for an apparatus for the treatment of wastewater comprising a clarifier (6), an anaerobic digester, a mechanism for collecting a portion of a biogas produced in the anaerobic digester and/or a mechanism to burn a portion of the produced biogas, a lagoon, anoxic culture(s), and a mechanism for storing the treated wastewater downstream of the lagoon.    DESCRIPTION OF DRAWING(S) - The figure is an illustration of the invention.    Wastewater source (1)    Grade screen separation device (3)    Pump (4)    Hopper (5)    Clarifier (6)    Valve (9)