低温下固定化微生物降解水体中阿特拉津的效果

Effect of Biodegradation of Atrazine in the Waterbody by Immobilized Microorganism in Low Temperature

针对低浓度阿特拉津对地表水、地下水的污染，于低温（10℃）条件下（考虑其在地下水或寒冷地区地表水污染中的应用），筛选的高效降解阿特拉津的优势菌株——4株茵W2、L1、L2、N8的混合菌（1：1：1：1），采用吸附固定技术对其进行固定，选取最佳微生物固体载体——活性炭，并筛选出其最佳固定化条件：活性炭粒径为0．5～1mm、pH=8。在此条件下，对固定化与悬浮态菌体处理阿特拉津的效果进行对比。实验结果表明，固定化混合菌的降解率在6d内即达到了99．91％。

For remediation of the surface water and groundwater polluted by atrazine in the low temperature, the most effective microorganism for the degradation of atrazine was studied using the mixed strains, W2.L1.L2.N8 （1 ： 1 ： 1 ： 1）. The activated carbon was＇selected as the immobilized carrier of microorganisms, and the optimal immobilising conditions were： the diameter of activated carbon 0.5--1 mm, pH = 8. Under the conditions, the expriments of atrazine biodegradation by suspended and immobilized microorganisms were compared, the results showed that the biodegradation rate of immobilized microorganisms reached as high as 99.91% in 6 days.