污泥基活性炭吸附Cu^(2+)的应用研究

Application of activated carbon made from sewage sludge for adsorbing Cu^(2+)

以城市污水处理厂剩余污泥为原料,以ZnCl2为活化剂制取污泥基活性炭。以此污泥基活性炭为吸附剂,对含Cu2+的废水进行了吸附实验研究。考察了溶液pH值、Cu2+的起始浓度对Cu2+离子吸附量的影响;利用等温吸附实验作出吸附等温线,并考察了污泥基活性炭吸附剂吸附Cu2+的动力学方程。实验结果表明,污泥基活性炭对Cu2+具有良好的吸附性能。吸附的最佳pH值为5;吸附符合Langmuir和Freundlich吸附等温方程,吸附为优惠吸附,吸附量随着吸附质溶液浓度的增加而增大;吸附平衡时间为4 h,吸附动力学符合二级动力学方程。

Using municipal wastewater treatment plant residual activated sludge as raw material,Zncl2 as activator,activated carbon was prepared.Its application as activator for adsorbing Cu2＋ in wastewater was also studied.The effects of the initial pH value of the solution,the initial concentrations of Cu2＋ in the solution on the adsorption capacity were investigated.The absorption isotherm was drawn,and the dynamics equation was also studied.The results indicated that the adsorption performance of activated carbon made from sewage sludge towards Cu2＋ is fine.The optimum pH value is 5.The absorption isotherm well fits the models of both Langmuir and Freundlich equations.The adsorption process is concluded to be a kind of favorable adsorption.The adsorption capacity increases while the solution concentration increases.The adsorption equilibrium time of Cu2＋ is 4 hours.The adsorption process pertains to be second-order kinetics process.