Sustainable copper recovery from industrial effluents through iron screen-assisted cementation under stirred conditions
Résumé
This study introduces a cementation system employing iron screens positioned within a mechanically stirred batch reactor for efficient copper extraction from wastewater.Systematic experimental investigations examined the influence of four operational parameters: initial copper concentration (0.01-0.03M), agitation speed (100-800 rpm), reaction duration (up to 50 minutes), and number of iron screens (3-7).Results demonstrated that copper removal efficiency reached 82-88% under optimized conditions, with the process governed primarily by external mass transfer rather than surface reaction kinetics.Response Surface Methodology yielded a highly predictive quadratic model with good agreement between experimental and predicted values of copper removal (R² = 0.9846).Multiobjective optimization identified optimal operating parameters: 0.0295 M initial concentration, 757 rpm agitation intensity, 47.4 minutes reaction time, and three iron screens, achieving 87.57% copper recovery.The proposed system offers distinct advantages including operational simplicity, direct recovery of metallic copper, minimal chemical consumption, and straightforward industrial scalability.This work presents a sustainable, cost-effective solution for copper-bearing wastewater treatment that simultaneously addresses environmental protection and resource recovery imperatives.
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