[Experimental research on bioremediation of groundwater contaminated by herbicide atrazine]

The experimental research on the static degradation and treatment of groundwater contaminated by herbicide atrazine was conducted by using bacterium AT which was isolated from the sludge outlet of workshop of the pesticide factory. And the result indicated that bacterium AT had the ability of degradation of atrazine with pH ranged from 5.0 to 10.0, and the optimum extent was 6.5-8.0. The experimental conditions (pH = 7.5, t = 10 degrees C) were similar to that of the aquifer in study area. Then the rate of degradation of atrazine was up to 31.08% for one addition of bacterium AT. And the environmental factors changed simultaneously in the course of experiment such as DO, pH and etc. decreasing with the reducing of concentration of bacterium AT. In addition, a mode of dropping bacteria was designed to simulate the condition of throwing bacteria in field. And the permeability of aquifer decreased 60.54% after treatment and the renewals were 48.96% after washing with clean water for 10 days, which indicated the method of renewal is effectual.