NOVELTY - Anaerobic digester comprises a horizontal vessel (1) whose inner side is provided with at least one shaft having 4-100 radial or horizontal or diagonal baffles (3) at equal distribution. An outer side of the vessel is attached with a handle (2-1, 3-1) or wheel. The vessel is provided with a first port at one end for introducing raw biomass wastes, a second port for discharging stabilized wastes on the opposite end, and a one valve-controlled gas port. A small hand operated shredder is coupled to the vessel for shredding/cutting/crushing large and hard solids and attached to an inlet port (2).    USE - The anaerobic digester is useful for converting household organic wastes (such as vegetable peelings, fish dressing wastes, rotten fruits, cooked food having rice, vegetables, chicken meat, sweets, moldy bread and biscuits, egg yolks, egg shells, fruit peels, fats, chicken bones , garden grass and leaves) for generating stabilized compost of less water and obtaining methane rich biogas (all claimed) for household and agriculture soil applications and regular onsite use.    ADVANTAGE - The digester effectively and conveniently facilitates digestion of household organic wastes: with high solids and less moisture; without preprocessing or pretreatments and electricity; through inexpensive microbial process. The digester: has high retention of wastes biomass for complete digestion in small volume; is pollution free; releases nutrients bound in biodegradable organic materials through anaerobic process; produces soil conditioner with nutrients from organic wastes that improves moisture retention and air circulation qualities; retains nutrients in an eco-friendly material for the slow release in soil applications; balances water content of the digested matters, compost for convenient handling and transportation; provides better aeration; prevents compaction of soil which facilitates improved agriculture; enables easy handling, transportation and direct use of stabilized compost conveniently; avoids storage/transportation costs or emission hazard and difficulty in collection, multilevel segregation, emission hazards in transportation and handling areas, reduces public burdens on centralized treatments; and is compact and free of pollution and mosquito breeding from discharges.    DETAILED DESCRIPTION - Anaerobic digester comprises a horizontal vessel (1) provided with insulation and preferably cylindrical shape at an end of the vessel. An inner side the vessel is provided with at least one shaft having 4-100 radial or horizontal or diagonal baffles (3) at equal distribution. An outer side of the vessel is attached with a handle (2-1, 3-1) or wheel to rotate the shaft from outside. The vessel is provided with a first port having a 50-500 mm diameter at one end for introducing raw biomass wastes, a second port having a 50-100 mm diameter for discharging stabilized wastes on the opposite end, and a one valve-controlled gas port having a 5-10 mm diameter above the level of the first port. A small hand operated shredder having a 250-1000 ml volume is coupled to the vessel for shredding/cutting/crushing large and hard solids which is attached to an inlet port (2). An INDEPENDENT CLAIM is included for performing anaerobic digestion of biodegradable wastes, comprising feeding biodegradable waste in the anaerobic digester, conducting anaerobic process of digestion and biomethanation optimally at mesophilic to thermophilic temperature conditions to generate biogas and discharge waste solids.    DESCRIPTION OF DRAWING(S) - The figures show a schematic view of portions of an anaerobic digester.    Horizontally fabricated closed vessel (1)    Inlet port (2)    Handle (2-1, 3-1)    Baffles (3)    Composted material discharge port or outlet port. (5)