Flotation of Cadmium Ions from Wastewater Using Air Micro-Bubbles
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Chemical Engineering Department, University of Baghdad, Baghdad, Iraq
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Hayder Noori Abd Alhuseen   

Chemical Engineering Department, University of Baghdad, Baghdad, Iraq
J. Ecol. Eng. 2023; 24(8):95-105
In this work were carried out to verify the efficiency of micro-bubbles in flotation the heavy metals ( Cadmium ions ) from wastewater. Its unique attributes of being affordable, having a straightforward design, being highly efficient, and not causing any secondary contamination are the reasons for this. The flotation process ( removal efficiency) was analyzed under different reaction conditions. Including PH of initial solution, initial pollutant concentration , gas (air) flow rate, type ( anionic or cationic) and concentration of surfactant used, sampling port location and contact time. It was found from the experiments that the removal of Cd(II) by micro-bubbles was higher at pH 7.2, flow rate of 0.50 L/min, SDS surfactant concentration of 15 mg/L, pollutant concentration of 30 mg/L, and at a high 30 cm port, with a removal efficiency of 98.44%. In addition, normal bubbles were used in experiments alongside micro-bubbles, revealing a 56.5% increase in removal efficiency. Furthermore, the study identified the kinetic flotation order of Cd(II) ions to be approximately first order.
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