Denitrifying bacteria is a kind of bacteria that can cause denitrification. Most of them are heterotrophic and facultative anaerobic bacteria, such as denitrifying bacteria, Brucella and Aeromonas pilosa.
Under the condition of xenon, they use oxygen in nitric acid to oxidize organic matter and obtain the energy needed for their own life activities. Denitrifying bacteria are widely distributed in soil, feces and sewage. Nitrate nitrogen can be transformed into nitrogen instead of ammonia nitrogen, which is not completely opposite to the role of nitrifying bacteria. It is mainly used for sewage treatment, such as landscape water treatment, urban inland river treatment and aquaculture treatment, among which aquaculture sewage treatment is the most widely used.