Studies on influencing factors of heterotrophic nitrifying bacteria treating black and odorous water bodies

Abstract

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%.