And 20 strains of dominant bacteria have been separated from bottom mud with nitrosation, and identified as 6 classes, such as: Bacillus, Arthrobacter, Pseudomonas, Xanthomonas, Nitrosococcus and Nitrobacter. 用亚硝化培养基从底泥中分离了NH4-N降解优势菌20株,经鉴定,分别为Bacillus、节杆菌属(Arthrobacter)、Pseudomonas、Xanthomonas、Nitrosococcus和Nitrobacter等6个属。