玉米加工污水剩余污泥吸附铅和镉的影响因素

Factors Affecting Adsorption of Lead and Cadmium onto Excess Sludge Obtained from Corn Processing Wastewater Treatment Station

以玉米加工污水剩余活性污泥为吸附剂，研究吸附时间、温度、pH值、污泥投加量、铅镉共存等因素对污泥吸附铅、镉的影响．结果表明，玉米加工污水剩余污泥吸附铅、镉是快速过程，温度对吸附影响较小，吸附的最佳pH=4～8，铅和镉的吸附量随污泥投加量的增加而增加，铅吸附最佳投泥量为0．5g／L，污泥吸附不同初始质量浓度镉的最佳污泥投加量不同，为0．5～2g／L；在铅与镉共存的吸附体系中，铅的存在对镉的吸附有抑制作用，而镉的存在对铅的吸附几乎没有影响．

The excess sludge driven from corn processing wastewater treatment station was applied to absorbing lead and cadmium. The factors affecting the adsorption including adsorption time, temperature, pH value, excess sludge mass and the coexisting of lead and cadmium were investigated and analyzed. The result shows the adsorption of lead and cadmium onto the sludge is a quick process and the temperature has a less effect on the adsorption of lead and cadmium onto the sludge. The optimal adsorption pH range of the system for lead or cadmium is from 4 to 8. The adsorption capacity of lead and cadmium onto the sludge increases with the sludge mass increasing; the optimal sludge mass for lead adsorption is 0.5 g/L, the optimal sludge mass for cadmium adsorption is different for the different initial concentration of cadmium and the value is between 0.5 g/L and 2 g/L. In the coexisting adsorption system of lead and cadmium, lead coexisted has an inhibitory effect on the adsorption of cadmium and cadmium coexisted has little effect on the adsorption of lead.