NOVELTY - Apparatus (100) comprises chamber (106) for containing mixture of organic mass and micro-organisms; and agitator (120) provided in chamber, having rotatable shaft (114) extending through central bore of chamber, agitator arms (116) extending from shaft, and paddle (118) connected to each agitator arm; where each agitator arm is connected with the paddle angled at the first and second angles to enable homogenous mixing of mixture without spilling out of chamber in response to rotation of shaft.    USE - For treating/composting organic mass such as organic waste e.g. agricultural waste, food waste, organic refuse, mill effluent, municipal waste, sewage, sludge, animal waste, and industrial waste; particularly for recycling ammonia generated from the treatment of organic mass.    ADVANTAGE - The apparatus provides unit to scale up composting operations, without the need for large amounts of space for the increased amount of throughput. The apparatus enables homogenous aeration throughout the organic waste, thus reducing foul odors. The organic waste can be treated to well-matured in a relatively short period of time e.g. less than one day. The apparatus and system produce organic fertilizers with increased nitrogen-phosphorus-potassium (NPK) values e.g. NPK value of more than 6. The apparatus and system prevents leeching of nutrients from organic mass and provides a solution to the waste disposal problem by converting organic waste into useful high quality organic fertilizers. Advantageously, agitatator is more cost effective than having a several independent agitators or paddles disposed in the treatment zone. Also, the cost of constructing and operating the apparatus is lower than that of apparatus with independent agitators or paddles because of lower energy consumption and lower maintenance cost due to fewer moving parts in apparatus.    DETAILED DESCRIPTION - Apparatus (100) comprises chamber (106) for containing mixture of organic mass and micro-organisms selected to degrade organic mass; and agitator (120) provided in chamber to agitate the mixture, having rotatable shaft (114) extending through central bore of chamber, agitator arms (116) extending from shaft, and paddle (118) connected to each agitator arm, the paddle is arranged to make first angle with respect to longitudinal axis of connected agitator arm and arranged at second angle with respect to longitudinal axis of shaft; where each agitator arm is connected with the paddle angled at the first and second angles to enable homogenous mixing of mixture without spilling out of chamber in response to rotation of shaft. The apparatus further comprises system for recycling ammonia generated from the treatment of the organic mass, includes unit for collecting ammonia generated from the treatment of organic mass; and unit for distributing the collected ammonia where the distributing unit is connected to collecting unit.    DESCRIPTION OF DRAWING(S) - The figure shows perspective internal view of apparatus.    Apparatus (100)    Chamber (106)    Shaft (114)    Agitator arm (116)    Paddle (118)    Agitator (120)