絮状污泥吸附Cr^(6+)特性研究

Study of the Characteristics of Adsorption of Cr^(6+) by Flocculent Sludge

以絮状污泥为生物吸附剂,探究其在不同条件下对Cr^(6+)的吸附效果,并分析其吸附动力学和吸附热力学行为。结果表明,絮状污泥吸附Cr^(6+)的最佳条件为:接触时间1h,pH=0.8,30℃,污泥投加量7g/L,Cr^(6+)初始质量浓度30mg/L。絮状污泥对Cr^(6+)的吸附可用伪二级动力学模型和Langmuir模型拟合,吸附过程以化学吸附为主,存在单分子层吸附。

In this study,flocculent sludge was used as biosorbent to explore its adsorption effect on Cr^(6+) under different conditions,and to analyze its adsorption kinetics and adsorption thermodynamic behavior.The results showed that the optimum conditions for Cr^(6+) adsorption by flocculent sludge are:contact time 1 h,pH=0.8,30 ℃,sludge dosage 7 g/L,initial Cr^(6+) concentration 30 mg/L.The adsorption of Cr^(6+) by flocculent sludge can be fitted by pseudo-second-order kinetic model and Langmuir model.The adsorption process is mainly chemical adsorption,and there is monolayer adsorption.