NOVELTY - Electron-donor supply apparatus (1) involves supplying volatile organic matter (3) to microorganisms at peripheral part of container by molecule permeation of non-porous property film part of the container. The peripheral part of stacked body is heat-sealed and the capillary tube of liquid permeation part is obstructed. The container is divided in two areas connected by arranging the liquid permeation part where organic matter is stored to one area. The supply port is equipped with supply nozzle (7) connecting the organic matter storage tank (6).    USE - An electron-donor supply apparatus for removing nitrogen compounds e.g. ammonia, nitrate ion, or nitrite ion.    ADVANTAGE - Volatile organic matter can be uniformly sustained-released from the whole surface of liquid permeation part and nonporous property film which is contacted even when immersed underwater. By permeating volatile organic matter, thickness reduction of container is attained and swelling of container by gasification. Microorganisms can be carried out in a favorable state and target component can be removed.    DETAILED DESCRIPTION - INDEPENDENT CLAIMS are included for:    (1) a method of manufacturing electron-donor supply apparatus comprising clamping the liquid permeation part, heat-sealing the peripheral part of stacked body and obstructing the capillary tube, and equipping the surface of stacked body with one or both of protective layer from external impact;    (2) bioreactor with water absorptive polymer carrier which fixed microorganisms is applied and adhered to non-porous property film part of the apparatus;    (3) removal process of gaseous ammonia by dissolving the gas in water to obtain ammonia containing water, and restoring nitrogen gas; and    (4) removal apparatus of gaseous ammonia having gas introduction part, water sprinkler and microorganism processing area.    DESCRIPTION OF DRAWING(S) - The drawing shows a longitudinal cross-sectional view of the form at the time of immersing and using underwater the lower part of electron-donor supply apparatus.    Electron donor supply apparatus (1)    Volatile organic matter (3)    Organic matter storage tank (6)    supply nozzle (7)    Tube (8)