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In order to effectively solve the problem of high concentration of COD and ammonia nitrogen in black and odorous water, a heterotrophic nitrifying bacterium A-2 was screened out, which can simultaneously remove ammonia nitrogen and organic pollutants in water. The removal efficiency of the bacterium A-2 to organic pollutants and ammonia nitrogen in water and its influencing factors were investigated. The results showed that the removal rates of COD and ammonia nitrogen by strain A-2 were 89.1% and 53.2% respectively, and environmental factors such as pH value, inoculation amount, temperature and organic matter concentration could affect the removal efficiency of organic pollutants by strain A-2. When pH value was 8, inoculation amount was 2% and temperature was 27 ℃, strain A-2 could remove C from water. The removal rate of COD can reach more than 80%.

Aiming at the problem of high concentration of COD and NH3-N in black and odorous water bodies, heterotrophic nitrifying bacteria which can remove ammonia nitrogen and organic pollutants were screened out in the laboratory simultaneously. A heterotrophic nitrifying functional group was constructed by using the strategy of bacterial source reorganization ecologically, and the removal effect of heterotrophic nitrifying functional bacteria on organic pollutants and ammonia nitrogen in water was studied. The results showed that the removal rate of ammonia nitrogen in the water was more than 52%, and the removal rate of COD was 57%∼86%. The effect of heterotrophic nitrifying functional bacteria group 1 on the removal of COD and ammonia in water was better, and the removal rate was 76.5% and 54.8%, respectively. The optimum inoculation test showed that the optimum inoculation amount of the heterotrophic nitrification bacteria group 1 was 10 ppm.