Cyanide effluent treatment by electrocoagulation using airlift reactor: Modeling and optimization by response surface methodology

• DOI: 10.1016/j.sciaf.2023.e01825
• Publication Date: 2023-08-01T16:27:40Z
• Authors: Z. Zmirli; A. Driouich; Slimane El Harfaoui; A. Mohssine; H. Chaair; B. Sallek
• Keywords: Airlift

The extraction processes of gold, silver, and various metals from ores consume 13% 1.1 million metric tons hydrogen cyanide produced worldwide annually. Therefore, developing efficient to treat the issuing effluents before releasing them into environment is imperative. In this context, present study aims evaluate effect three factors: inter-electrodes distance (d), current density (J) electrolysis time (t) on removal efficiency by a combination between Electro-Coagulation process Internal Loop Airlift Reactor. Employing an airlift reactor enables effective dispersion coagulant without need for additional stirring. optimization was conducted using Response Surface Methodology in conjunction with Box–Behnken Design. statistical analysis results reveal that time(t)and (J)have significant effects performance reduce confidence level 99%, 97.5%, respectively. multiple regression method demonstrates model's overall predictability as coefficient determination 98% efficiency. investigation inside RSM 2 3-dimensional graphs allowed us define optimal domains variables cyanide. At 68 A.m−2 13mm during 57.5min time, 98.27% achieved. knowledge obtained through operating batch mode treatment effluent EC confirms EC's ability successfully remove might be useful transposition continuous mode.