Abstract: 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.

Key words: waterbody polluted by atrazine, lower temperature, immobilisation, remediation