Kinetic Constant Modeling of Zn(II) Ion Removal from Synthetic Wastewater by Gene Expression Programing

Document Type : Research Article


1 Department of Mining & Metallurgical Engineering, Amirkabir University of Technology, Hafez Ave., Tehran, Iran.

2 Department of chemistry, Amirkabir University of Technology, Tehran, Iran


The separation of ions from wastewater and environments such as hydrometallurgy has been a major challenge in the development of ion flotation in recent years. Few studies have been carried out on the kinetics of metal ion removal by ion flotation. In this study, a new model using the gene expression programming (GEP) method is proposed to predict the kinetic constant of zinc ion removal (k-Zn(II)) from synthetic wastewater with sodium dodecyl sulphate as a collector. The efficiency of ion flotation depends on both the amount of ion removal and water removed during the process. In this regard, the water removal kinetics constant (k-W) was also investigated. The effect of important parameters on k-Zn(II) and k-W including the ratio of SDS/Zn(II), the activity coefficient, and the pH were investigated. The values of R2, RMSE, and VAF of the GEP models for the testing data for k-Zn(II) were 0.98, 0.66, and 98.9 and for k-W, they were 0.94, 0.004, and 0.93, respectively. The results indicate the high performance of GEP models for the prediction of k-Zn(II) and k-W. The sensitivity analysis of GEP models showed that k-Zn(II) and k-W are more sensitive to pH and the ratio of SDS/Zn(II), respectively. 


Main Subjects

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