NOVELTY - A multistage anaerobic digester (200) for treatment of wastewater comprises pre-treatment process by centrifugal wastewater filtration system (CWFS) having an output substrate of energy latent organics that are within 0.2-30 micron; hydrolysis stage converting the complex organic polymers; acidogenesis stage, coupled to outlet of hydrolysis stage; acetogenesis stage, coupled to outlet of acidogenesis stage, and methanogenesis stage, coupled to outlet of acidogenesis stage, converting simple molecules to end product including quantity of methane and carbon dioxide.    USE - As multistage anaerobic digester for treatment of wastewater including complex organic polymers (claimed).    ADVANTAGE - The multistage anaerobic digester processes a substrate relatively free of unwanted constituents which improves an efficiency of conversion of the substrate to biogas.    DETAILED DESCRIPTION - A multistage anaerobic digester (200) for treatment of wastewater including complex organic polymers comprises a pre-treatment process by centrifugal wastewater filtration system (CWFS) having an output substrate of energy latent organics that are within 0.2-30 micron; a hydrolysis stage converting the complex organic polymers, including output substrate, received at inlet to solubilized monomers at an outlet; an acidogenesis stage, coupled to the outlet of hydrolysis stage, converting the solubilized monomers into intermediate products at an outlet of acidogenesis stage; an acetogenesis stage, coupled to the outlet of the acidogenesis stage, converting the intermediate products into simple molecules at an outlet of the acetogenesis stage; and methanogenesis stage, coupled to the outlet of the acidogenesis stage, converting the simple molecules to an end product, where the end product including a quantity of methane and a quantity of carbon dioxide, where each the stage includes a self-contained compartment containing angled augers, coated with immobilized enzymes, configured to transport the substrate from stage to stage. An INDEPENDENT CLAIM is included for anaerobic digestion of wastewater substrate including complex organic polymers involving a) pre-treating the wastewater substrate using pre-treatment process by centrifugal wastewater filtration system (CWFS) having an output substrate of energy latent organics that are within 0.2-30 micron range; b) passing the wastewater substrate including the output substrate, through successive stages of a multistage anaerobic digester using augers as mechanical conveyors; and c) transforming, using enzymes immobilized to elements of the augers of the mechanical conveyors in contact with the wastewater, the complex organic polymers into successively simpler compounds at each stage to produce an output gas at one of the stages of the digester, where the output gas including predominately methane and carbon dioxide.    DESCRIPTION OF DRAWING(S) - The figure shows a schematic view of multistage anaerobic digester.    Multistage anaerobic digester (200)    Piping (202)    Tapered auger feed piping (205)    Auger housings (215)    Gas outlet valve (220)    Auger drain pipes (225)    Tapered auger outlet/feed piping (230)    Housing connecting pipe (240)