NOVELTY - Processing ammonia gas comprising introducing ammonia containing gas to storage tank (10) containing microbial support (11) of ammonium-oxidizing bacteria for forming nitrous acid from ammonia, sprinkling water in the tank, where ammonia dissolved in water is oxidized to nitrite nitrogen by the bacteria and the sprinkled water is recovered as circulating water, ammonium and/or nitrite nitrogen concentration is adjusted and supplied as sprinkling water, is new.    USE - The method is used for processing ammonia containing gas produced from compost plant of organic waste (claimed).    ADVANTAGE - The process enables to reliably and steadily process gas containing high concentration of ammonia and stably utilize ammonia as nitrite nitrogen using microorganisms. By repeating the process, without accumulating nitric acid ammonia, the ammonia gas is stably and continuously deodorized.    DETAILED DESCRIPTION - Processing ammonia gas produced from compost plant of organic waste comprises introducing ammonia containing gas to storage tank (10) containing microbial support (11) of ammonium-oxidizing bacteria for forming nitrous acid from ammonia, sprinkling water in the tank, where ammonia dissolved in water is oxidized to nitrite nitrogen by the bacteria and the sprinkled water is recovered as circulating water, ammonium and/or nitrite nitrogen concentration is adjusted and supplied as sprinkling water.    An INDEPENDENT CLAIM is also included for ammonia containing gas-processing apparatus comprising microbial support storage tank and deluge system (12) for sprinkling water in microbial support storage tank. A circulation water storage tank (20) recovers the water sprinkled in the tank as circulating water and stores it. A unit for adjusting ammonium ion concentration of the circulating water and water sprinkling line (21,22) which transfers the circulating water to the deluge system are also provided to the apparatus.    DESCRIPTION OF DRAWING(S) - The figure shows an outline of the ammonia containing gas processing apparatus. (Drawing includes non-English language text).    Gas introducing line (1)    Air blower (2)    Damper (3)    Ammonia densitometer (4)    Control unit (5,28)    Microbial support storage tank (10)    Microbial support (11)    Deluge system (12)    Circulating water storage tank (20)    Water sprinkling line (21,22)    Electrical conductivity meter (23)    pH meter (24)    Solution sending pipe (25)    Anaerobic ammonia oxidation treatment tank (30)    Return flow pipe (31)    Supplementary water line (40)