NOVELTY - Hydrogenation oxide is added to increase nitration function activity of microorganism in activated sludge by nitration function microorganism culture process and nitrification functional microorganism long-term operation activity process. Nitration functional microorganism culture process involves using ferric trichloride and sodium bicarbonate as raw material, preparing ultramicron iron hydroxide with concentration of 10%, and preparing ferric chloride solution and sodium bicarbonate solution.    USE - Method for adding hydrogenation oxide to increase nitration function activity of microorganism in activated sludge on site.    ADVANTAGE - The method for adding hydrogenation oxide to increase nitration function activity of microorganism in activated sludge on site is effectively and stably enabled.    DETAILED DESCRIPTION - Hydrogenation oxide is added to increase nitration function activity of microorganism in activated sludge by nitration function microorganism culture process and nitrification functional microorganism long-term operation activity process. Nitration functional microorganism culture process involves using ferric trichloride and sodium bicarbonate as raw material, preparing ultramicron iron hydroxide with concentration of 10%, and preparing ferric chloride solution and sodium bicarbonate solution with concentration of 15 %mass and 2.6 %mass, which can effectively control chemical reaction strength of ferric trichloride and sodium bicarbonate, by pipeline conveying ferric trichloride solution and sodium bicarbonate solution at the same time into centrifugal pump. The volume ratio of ferric trichloride solution and sodium bicarbonate solution in the centrifugal pump is 1:9. The flow rate of ferric chloride solution and sodium bicarbonate solution is more than 1 m/second. Ferric trichloride solution and sodium bicarbonate solution in centrifugal pump through centrifugal pump impeller are mixed to chemically react and generate ultrafine iron hydroxide solution with concentration of 10 %mass. The ultrafine hydroxide solution is discharged from centrifugal pump outlet continuously, ultrafine iron hydroxide is directly put into biological denitrification system aerobic pool in the active sludge mixed solution. Particulate hydroxide solution dosage is controlled such that the active sludge mixed solution contains 5 mg/g MLVSS.d to 10 mg/g MLVSS.d. Ultrafine hydroxide solution point is different according to aerobic tank reaction type, for complete mixing type aeration pool, the ultrafine hydroxide solution is directly added to the central portion of the aerobic tank, for an pushing aerobic tank, flow ultra-fine particle hydroxide is added to the aerobic tank, The hydraulic retention time of the activated sludge aeration pool is 1.5-2.5 hours between the passage and the aerobic tank in the aeration mixing effect to ultra-fine particle hydroxide and activated sludge is fast, final ultra-fine particle ferric hydroxide and the total amount is controlled in active sludge mixed liquid iron reaches 30-50 mg iron/g. The process of culturing original promoting information of the system sewage water inlet load condition, gradually extend active sludge mud age, the normal nitrification load condition is designed sludge age is 1-2 times, the culture process time is 10-20 days. As microbial floc and iron hydroxide flocculating combination material is formed and stable, iron salt chemical agent is added into biological nitrogen removal system aerobic pool in active sludge mixed solution so as to supplement iron element loss amount, sewage processing system, iron salt chemical agent in the amount of additional element for a lifting water supplying is 1-2 mg, the dosage only used as surplus sludge discharge loss of iron element, specific dosage according to surplus sludge discharge caused by sewage system of iron element loss amount. During the period, iron ion intervening active sludge microbial metabolic process with denitrification function, reinforced iron ion in electron transfer and enzymatic reaction activator effect can effectively improve microorganism biochemical reaction metabolic activity, and having promoting effect for the bacteria and enzyme secretion, to form nitration function active sludge with high biological metabolism activity.