研究采用PAM改性处理硅藻原土并应用于处理含高浓度Pb2+模拟废水.结果表明:改性硅藻土吸附能力与表面覆盖PAM的厚度有关.与原土相比,改性后的硅藻土对高浓度废水的处理能力明显提高;对酸性重金属废水的适应性增强.根据正交试验将试验方案进行优化,得到提高去除率的优化方案为:投加20g/L PAM改性的硅藻土5g,水样pH值为6,水样初始浓度为1500mg/L时,可显著提高废水中Pb2+的去除率.饱和吸附试验显示,改性硅藻土的饱和吸附容量可达到66.15～68.95 mg/g.%The modification of diatomite by PAM and the application of modified diatomite to deal with high concentrations of Pb2+ in simulated wastewater were investigated. The results showed that the adsorption capacity of modified diatomite was associated with the thickness of PAM film covered on the surface. Compared with the original diatomite, the processing capacity and acid adaptation of modified diatomite were greatly enhanced in high concentration heavymetal wastewater. Based on orthogonal experiment, the optimization program was obtained to optimize the removal rate : the dosage of modified diatomite(20g/L PAM) was 50g/L, the pH value was 6. When the initional concentration of Pb2+ was 1500mg/L, the removal rates of Pb2+ in the simulated sewage could be increased significantly. Saturated adsorptron capacity of modified diatomite could reach 66.15～68.95mg/g through the saturation experimemt.
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