Removal of Ni(II) in aqueous solutions by foam fractionation

Wenyao ShaoDepartment of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian361005, P.R. China, Tel./Fax: +86 592 2186059Correspondence[email protected]

Jingyun ZhangDepartment of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian361005, P.R. China, Tel./Fax: +86 592 2186059Correspondence[email protected]

Anni FengDepartment of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian361005, P.R. China, Tel./Fax: +86 592 2186059Correspondence[email protected]

Xueshan PanDepartment of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian361005, P.R. China, Tel./Fax: +86 592 2186059Correspondence[email protected]

Zongyuan XiaoDepartment of Chemical and Biochemical Engineering, College of Chemistry and Chemical Engineering, Xiamen University, Xiamen, Fujian361005, P.R. China, Tel./Fax: +86 592 2186059Correspondence[email protected]

Abstract

The electroplating industry uses a lot of water in many of its processes. Because of the rapidly decreasing availability of water in many areas and the need of pollution control, efficient and economical methods for treating electroplating wastewater are urgently studied. Foam fractionation was used to remove divalent ions Ni(II) from its aqueous solutions with two surfactants. The optimum values influencing the separation effect of these ions were studied. The optimum separation conditions for Ni(II) were initial Ni(II) concentration 5 mg/L, liquid loading volume 200 mL, gas velocity 70 mL/min, the initial pH and temperature 30°C, providing an enrichment ratio 12, and a recovery 98%. Enrichment ratio was found to increase with an increase in the feed flow rate. With a concentration decrease in the bulk solution, the separation factor was found to increase. The study indicates the foam separation is a feasible and promising way for treating electroplating effluents.

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Removal of Ni(II) in aqueous solutions by foam fractionation

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Removal of Ni(II) in aqueous solutions by foam fractionation

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