Heavy metals removal using the activated sludge
A novel complex technological process of the activated sludge was developed in order to removal copper from the wastewater containing Cu 2+ ions. Results of the single-factor experiments show that the optimum adsorption condition was pH 5.0, room temperature, adsorbent concentration 10.0 g. L -1 and equilibrium time 10 min. The adsorption equilibrium data of Cu (II) ions in optimum conditions fit well to both the Langmuir and Freundlich models with high correlation coefficient of nearly 1.00 and 0.94. And the second-order kinetic model is very suitable for the experimental kinetic data with a high correlation coefficient of 1.00 at optimum conditions. The maximum adsorption capacity of the sludge is determined as 24.3 mg g -1 (wet-weight basis), and the rate constant 63.4 g mg -1 min -1. The concentration of Cu 2+ was around 0.04 mg. L -1 after adding new sludge, far below the request of Integrated Wastewater Discharge Standard.
adsorption activated sludge Cu(II) ions adsorption isotherms adsorption kinetics
Huiping Song Xingang Li Jinsheng Sun Xiaohong Yin
National Engineering Research Center of Distillation Technology, School of Chemical Engineering and School of Chemistry and Chemical Engineering, Tianjin University of Technology, Tianjin 300191, Chin
国际会议
The 5th International Conference on Separation Science and Technology(第五届国际分离科学与技术会议)
北京
英文
2007-10-14（万方平台首次上网日期，不代表论文的发表时间）