Study on Comprehensive Treatment of Leachate From Uranium Tailings Pond
In view of the leachate from uranium tailings pond containing uranium,manganese,ammo-nia nitrogen and other pollutants,the comprehensive recovery treatment was carried out by ion ex-change to recovery uranium,electroflocculation to remove the heavy metal ions and gas membrane to recover ammonia nitrogen.The effect of ion exchange method on uranium recovery was verified.The removal effect of electroflocculation on uranium,manganese and other heavy metal ions was investiga-ted under different pH of raw water,aeration time and electroflocculation time.And the separation effect of gas membrane on ammonia nitrogen in wastewater under different ammonia nitrogen concen-tration was studied.The results show that the first stage removal rate of uranium by resin can reach 95.7％.The electroflocculation effect is the best when the pH of raw water(pH= 7.5)is not adjus-ted and no aeration is performed,the concentration of uranium and manganese in the effluent can be reduce to 99.79 μg/L and 0.06 mg/L,respectively,after 5 min electroflocculation.When the ammo-nia nitrogen concentration in raw water is lower than 297.00 mg/L,the removal rate of ammonia ni-trogen in effluent after one treatment is greater than 99％,and the ammonia nitrogen concentration is reduce to 1.91 mg/L.This process can realize the recovery of uranium and ammonia nitrogen,and the concentration of other kinds of pollutants is lower than the national standard.
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