NOVELTY - The apparatus has a distribute load tub (10) for storing an organic waste of a processing object. An anaerobic digester (20) is provided with the organic waste to perform an anaerobic digestion process. An anaerobic digester effluent reservoir (30) stores effluent that is flowed out from the digester. The load tub is provided with a concentrate that is concentrated in a microorganism concentration device (40). The effluent reservoir supplies nitrogen-free water among stabilization liquid that is flowed out from a stabilization bath (50) to multiple nitrogen control tanks (60, 70, 80).    USE - Anaerobic absorption apparatus for processing organic waste. Uses include but are not limited to food waste, masking number waste, livestock excretion waste and sewage sludge waste.    ADVANTAGE - The apparatus regularly maintains nitrogen concentration at the anaerobic digester so as to provide solid concentration in an effective manner, so that processing of organic waste can be provided in en effective manner. The apparatus supplies the nitrogen-free water to the anaerobic digester through the nitrogen control tanks so as to control nitrogen concentration and solid concentration in an efficient manner, so that operation of the digestion tank is steadily maintained, effectiveness of long-term operation process can be improved and management expense of the apparatus is reduced. The apparatus enhances operation efficiency by increasing bio gas production efficiency, so that stability of digested sludge effluent supernatant water quality is improved. The apparatus controls flow rate of sludge during treatment process by using a sludge flow control bath, so that concentration efficiency of the treatment process can be improved. The apparatus increases operation efficiency by avoiding usage of an inorganic solid material in anaerobic digester effluent on a mesh portion of the anaerobic digester effluent reservoir.    DESCRIPTION OF DRAWING(S) - The drawing shows a block diagram of an anaerobic absorption apparatus.'(Drawing includes non-English language text)'    Distribute load tub (10)    Anaerobic digester (20)    Anaerobic digester effluent reservoir (30)    Microorganism concentration device (40)    Stabilization bath (50)    Nitrogen control tanks (60, 70, 80)