Identification of novel denitrifying bacteria Stenotrophomonas sp . ZZ15 and Oceanimonas sp. YC13 and application for removal of nitrate from industrial wastewater

Two novel denitrifying bacteria were successfully isolated from industrial wastewater and soil samples. Using morphological, biochemical/biophysical and 16S rRNA gene analyses, these two bacteria were identified as Stenotrophomonas sp. ZZ15 and Oceanimonas sp. YC13, respectively. Both of these two bacteria showed efficient NO3 −-N removing abilities under a semi-anaerobic condition without obvious accumulation of NO2 −-N, N2O-N and NH4 +-N. NO3 −-N removal from paper mill wastewater was also successful by treatments with either a denitrifier or an immobilization method. Therefore, this study provides valuable denitrifying bacteria in biotreatment of industrial wastewater and other environmental pollution caused by NO3 −/NO2 −.