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《Environmental Science》 2010-08
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Comparison of Heterotrophic Nitrification and Aerobic Denitrification System by Strain qy37 and Its Accelerating Removal Characteristic of NH_4~+-N

ZHANG Pei-yu,QU Yang,YU De-shuang,GUO Sha-sha,YANG Rui-xia(Department of Environmental Science and Engineering,Qingdao University,Qingdao 266071,China)  
The characterization in nitrogen removal of a heterotrophic nitrification-aerobic denitrification bacteria(qy37)was studied.A strain coded as qy37 which had simultaneous heterotrophic nitrifying and aerobic denitrifying ability was screened.In the light of its morphological and physiological characters as well as their sequence analysis of the 16S rDNA,strain qy37 was identified as Pseudomonas sp..In heterotrophic nitrifying system utilized ammonium chloride as nitrogen source,the concentration of NH 4+-N reduced from 138.52 mg/L to 7.88 mg/L and COD reduced from 2 408.39 to 1 177.49 mg/L by strain qy37 in 32 hours,the maximum accumulation of NH2 OH and NO 2--N were 9.42 mg/L and 0.02 mg/L respectively,it was speculated that NH2 OH was transformed to N2 O and N2 directly by strain qy37.In aerobic denitrifying system utilized sodium nitrite as nitrogen source,the concentration of NO 2--N reduced from 109.25 mg/L to 2.59 mg/L by strain qy37 in 24 hours,and the maximum accumulation of NH2 OH was 3.28 mg/L.Compared with heterotrophic nitrifying system,aerobic denitrifying system had a higher bacterial growth whereas the lower removal rate of TN and COD,as well as the accumulation of NH2 OH.NO 3--N was also detected in aerobic denitrifying system.It is considered that the upgrowth of bacterium and utilization of energy in aerobic denitrifying system were more efficient than that in heterotrophic nitrifying system.In heterotrophic nitrification-aerobic denitrification system,the removal rate of NH 4+-N improved 37.31% in 16 hours than that in heterotrophic nitrifying system,the accumulation of NH2 OH was less but N2 O was higher than that in both heterotrophic nitrifying system and aerobic denitrifying system.
【Fund】: 国家自然科学基金项目(50678085 50878107);; 青岛大学优秀研究生学位论文培育项目(YSPY2009014)
【CateGory Index】: X703
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