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Aerobic denitrification is a process reducing the nitrate into gaseous nitrogen forms in the presence of oxygen gas, which makes the nitrification and denitrification performed simultaneously. However, little was known on the diversity of the culturable aerobic denitrifying bacteria in the surface water system. In this study, 116 strains of aerobic denitrifying bacteria were isolated from the sediment, water and biofilm samples in Liangshui River of Beijing. These bacteria were classified into 14 genera based on the 16 S rDNA, such as  Pseudomonas ,  Rheinheimera , and  Gemmobacter . The  Pseudomonas  sp., represented by the  Pseudomonas stutzeri ,  Pseudomonas mendocina  and  Pseudomonas putida , composed the major culturable aerobic denitrifiers of the river, followed by  Ochrobactrum  sp. and  Rheinheimera  sp. The PCA plot showed the unclassified  Pseudomonas  sp. and  Rheinheimera pacifica  preferred to inhabit in biofilm phase while one unclassified  Ochrobactrum  sp. and  Pseudomonas resinovorans  had higher abundance in the sediment. In the overlying water, the  Pseudomonas stutzeri  and  Ochrobactrum rhizosphaerae  were found to have higher abundance, indicating these aerobic denitrifiers had different habitat-preferable characteristics among the 3 phases of river system. The findings may help select the niche to isolate the aerobic denitrifiers and facilitate the bioaugmentation-based purification of the nitrate polluted surface water.

Diversity of culturable aerobic denitrifying bacteria in the sediment, water and biofilms in Liangshui River of Beijing, China