阿特拉津的微生物降解特征研究

RESEARCH ON THE CHARACTERISTIC OF MICROBIAL DEGRADATION OF ATRAZINE

应用了从农药厂阿特拉津生产车间污泥中分离出的菌种AT菌,进行了系列降解实验。不同基质浓度的降解实验表明,在农药污染质阿特拉津的低浓度体系中,AT菌降解阿特拉津的反应符合一级动力学模式,属于米氏方程曲线的第一阶段的情形,并拟合出关系式V=0.064S;AT菌在外加氮源、碳源及以阿特拉津为唯一碳源和氮源等条件时对农药污染质阿特拉津均具有降解能力,且在以阿特拉津为唯一氮源(外加碳源)条件下的降解效果最好,此时的降解率为30.39%;模拟治理中,设计了细菌的投放方式以模拟野外条件下的菌种投加条件,难于生物降解的污染质阿特拉津的一次投菌降解率达到31.08%。

A series of experiments were conducted by using bacterium AT separated from the sludge of workshop of the pesticide factory.The experiment with different concentrations of pollutant atrazine indicated that the reaction accorded with the model 1 of dynamics and the curve belonged to the first phase curve of Michaelis equation when the concentrations of pollutant atrazine were lower.And the linear equation is V=0.064S(where V is rate of degradation,S means concentration of pollutant atrazine).And bacterium AT had the ability of degradation of pollutant atrazine when carbon source or nitrogen source was added into media.The effect of degradation was the best when carbon source was added and the rate of degradation was 30.39%.In addition,a mode of dropping bacteria was designed to simulate the condition of throwing bacteria in field and the rate of degradation of pollutant atrazine which is degraded difficultly was up to 31.08% for once dropping.