| In the course of present economic development, water scarcity and water deterioration have became important limiting factors of national economic developments in our country. The remediation and precaution of the water pollution have been extremely urgent.Biologic denitrification is one of the most popular methods to remove nitrite and nitrate from water. In the experiment, we used the dentrifier named YZ-2 which has been isolated in the laboratory. We researched the influence of different conditions on the dentrifier. In the batch experiment we used the sucrose,glucose, mixed carbon resource and sodium citrate as the carbon resource. First, through changing the pH value and temperature, we carried on a series of batch experiments and the primary condition have been determined; Secondly, we compared the denitrification result of single carbon resource and mixed carbon resource (sucrose, glucose) under room temperature and low temperature respectively. The result indicates, denitrifier YZ-2 has very strong denitrifying ability. The level of water can reach the national standard after treatment with of YZ-2.In order to have further understanding on the properties of YZ-2, Monod equation is employed to achieve kinetics analysis in this study. And four mathematical model have been received such as COD degradation Monod model, nitrate denitrification Monod model, the model of influence of temperature on dynamics and the model of effect of pH value on dynamics parameters. Moreover, sodium alginate and polyvinyl alcohol are used to embend and immobilize the denitrifier, meanwhile, the research on degrading the nitrogen waste water by the immobilized cell has been carried out through continuous experiment. Finally, the optimal technological parameters are defined by way of observing and studying the influence of experimental condition on denitrification.
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