赤泥在脱除废水中重金属离子的应用研究

为去除废水中的重金属对环境的危害，采用具有高的比表面积和孔隙率、较好的吸附性能廉价赤泥作为废水中重金属离子的吸附剂。实验结果表明，赤泥对Pb^2＋，Cd^2＋，Cr^3＋，Zn^2＋，Ni^2＋的对数吸附等温线都近似直线，基本符合Freundlich公式，且在室温条件下进行就能很快达到吸附平衡，不需要进行温度和pH的调节。当赤泥的添加量为2，0g／L时，Pb^2＋，Cr^3＋和Cd^2＋的吸附率分别达到90％，94％，85％以上。赤泥对重金属离子的吸附率随废水中其初始浓度的增大而减小。

Application Study on Absorption Rate of Heave Metal Ions in Wastewater by Red Mud

In order to remove the harmful heavy metal ions of the waster water,the cheap red mud with high specific surface area,porosity and good absorptivity was used as absorbtion agent.Pb2 ,Cd2 ,Cr3 ,Zn2 ,Ni2 can be removed from wastewater by red mud,for the experiment results show that: the logarithm adsorption isotherm of the heavy metal ions accord with Freundlich formula,and adsorption equilibrium at room temperature and the pH of red mud can arrive.When the adding dosage of red mud reaches to 2.0 g/L,the absorbtion rates of Pb2 ,Cr3 ,Cd2 reach to 90%,94%,85%,respectively.Saturated adsorption amount of heavy metal ions changes smaller with their concentration.