NOVELTY - An anaerobic digester comprises vessel having an internal partition defining an orbicular loop passage and an inner chamber; waste loading chute proximate first circumferential end of loop passage; effluent basin extending from the vessel at second circumferential end of loop passage; and liquid conduit connecting the effluent basin and the inner chamber.    USE - The digester is used for the anaerobic digestion of organic matter. It is used for the anaerobic conversion of both high solids and low solids wastes to methane, carbon dioxide, liquid effluent that can be used as fertilizer, and a solid residue that can be used as soil amendment. It is particularly useful for the treatment of high strength, large particle size wastes, such as source separated food waste, food processing waste, and poultry mortalities. It can also be used for municipal solid waste, manures, and other organic waste.    ADVANTAGE - The digester is simple, and combines the advantages of high solids loop digesters and low solids high rate digesters into a single orbicular vessel. It is simple, and has greater thermal and material efficiencies. It reduces or eliminates clogging and associated maintenance problems, and provides for separation and independent treatment of solid and liquid components of waste streams. It does not require powered pumping and driven mechanical devices.    DETAILED DESCRIPTION - An anaerobic digester comprises:    (A) vessel (10) having a cylindrical outer wall (14) and having an internal partition (11) defining an orbicular loop passage (12) and an inner chamber (13), where the loop passage has a first circumferential end and a second circumferential end;    (B) waste loading chute (20) proximate the first circumferential end and communicating with the loop passage;    (C) effluent basin (24) extending from the vessel at the second circumferential end and communicating with the loop passage, where the waste loading chute and effluent basin are configured to create a vessel air lock when filled with waste; and    (D) liquid conduit (28) connecting the effluent basin and the inner chamber.    DESCRIPTION OF DRAWING(S) - The figure is a perspective view of an anaerobic digester.    Vessel (10)    Internal partition (11)    Loop passage (12)    Inner chamber (13)    Outer wall (14)    Waste loading chute (20)    Basin (24)    Liquid conduit (28)    Spillway (31)