ENVIRONMENTAL POLLUTION CONTROL BY TREATMENT OF HEAVY METAL EFFLUENTS | Journal of Applied Chemical

Heavy metal ions are commonly found in industrial and municipal wastewaters. If discharged without sufficient treatment, these metal ions, when present in large quantities, can be detrimental to aquatic life and human health. The flotation process separates solid particles, liquid droplets, chemicals or ions, and biological entities from a bulk liquid based on their surface qualities. Metal ions are extracted from aqueous solutions via ion flotation. Using batch flotation methods, the removal of copper ions from simulated wastewater was examined in this research. A flotation column with a diameter of 0.15 m and a height of 1.2 m was built to investigate the rate of copper ion removal from waste water using the flotation technique. Experimentally, the effects of pH, copper ion concentration, air flow rates, and sodium dodecylsulfate concentration (SDS) as an anionic surfactant were studied. Also tested were the effects of frothers (Ethanol) and ionic strength (NaCI and Na2S04), as well as the best circumstances. The removal effectiveness was improved by adding SDS and increasing the pH, based on the results. Cu(II) removal was dramatically reduced when the ionic strength was increased from 0.0004 to 0.4 moles/lit. It was found that in the presence of 150 ppm SDS at pH = 11 and a flow velocity of 150 L/min, roughly 97-98 percent of copper ions with an initial concentration of 100 mg/l could be extracted by flotation.

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