Study of Coagulation-Coprecipitation for Treatment of Waste Water Containing Uranium and Thorium
In the process of preparation of fuel elements,there will be more different kinds of waste liquid containing uranium and thorium.The combined coagulation and coprecipitation technological process was used to treat waste water containing uranium and thorium.Experimental study the treatment effect of uranium removal in above the 5 influence factors.Results shown that the chitosan has the better flocculation effect and the removal rate of uranium rises with the initial concentration of uranium increasing.When the concentration of uranium rises to 60 mg/L,the effect of increasing of the concentration of uranium on the removal rate of uranium is no longer outstanding.The effect of the ratio of Th/U on the removal rate of uranium is obvious when the concentration of uranium is lower([U]=20～60 mg·L-1),but it is no longer outstanding when the concentration of uranium is higher([U]=60～100 mg·L-1).The removal rate of uranium tends to balance when the ratio of Th/U=1∶1.While the amount of chitosan is controlled within 0.5～1 mg·mgU-1,and pH is controlled about 8,the effect of treatment is better.The temperature has less effect on the removal rate of uranium,the removal rate of uranium is increase little as the temperature rising.In general,almost 92%uranium and 96%thorium could be removed from the waste water.
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