TY - JOUR ID - 10.1016/S1001-0742(10)60615-8 TI - Denitrification characteristics of a marine origin psychrophilic aerobic denitrifying bacterium AU - Haiyan Zheng AU - Ying Liu AU - Guangdong Sun AU - Xiyan Gao AU - Qingling Zhang and Zhipei Liu VL - 23 IS - 11 PB - SP - 1888 EP - 1893 PY - JF - Journal of Environmental Sciences JA - J. Environ. Sci. UR - http://www.jesc.ac.cn/jesc_en/ch/reader/view_abstract.aspx?file_no=2011231118&flag=1 KW - nitrogen removal;aerobic denitrification;marine environment;low temperature;Psychrobacter sp. S1-1 AB - A psychrophilic aerobic denitrifying bacterium, strain S1-1, was isolated from a biological aerated filter conducted for treatment of recirculating water in a marine aquaculture system. Strain S1-1 was preliminarily identified as Psychrobacter sp. based on the analysis of its 16S rRNA gene sequence, which showed 100% sequence similarity to that of Psychrobacter sp. TSBY-70. Strain S1-1 grew well either in high nitrate or high nitrite conditions with a removal of 100% nitrate or 63.50% nitrite, and the total nitrogen removal rates could reach to 46.48% and 31.89%, respectively. The results indicated that nitrate was mainly reduced in its logarithmic growth phase with a very low leve1 accumulation of nitrite, suggesting that the aerobic denitrification process of strain S1-1 occurred mainly in this phase. The GC-MS results showed that N2O was formed as the major intermediate during the aerobic denitrifying process of strain S1-1. Finally, factors affecting the growth of strain S1-1 and its aerobic denitrifying ability were also investigated. Results showed that the optimum aerobic denitrification conditions for strain S1-1 were sodium succinate as carbon source, C/N ratio15, salinity 10 g/L NaCl, incubation temperature 20℃ and initial pH 6.5. ER -