Journal of the Serbian Chemical Society 2012 Volume 77, Issue 11, Pages: 1661-1670
https://doi.org/10.2298/JSC120302037T
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Zinc removal from wastewater by complexation-microfiltration process
Trivunac Katarina (Faculty of Technology and Metallurgy, Department of Analytical Chemistry and Quality Control, Belgrade)
Sekulić Zoran (Institute of Public Health of Belgrade, Belgrade)
Stevanović Slavica (Faculty of Technology and Metallurgy, Department of Analytical Chemistry and Quality Control, Belgrade)
As a result of its wide industrial applications, zinc has become an important
contaminant in aquatic environment since it is a toxic heavy metal and some
of its compounds such as zinc arsenate and zinc cyanide, may be extremely
hazardous. Therefore, there is a growing need for developing simple methods
capable of separating and recovering trace zinc from environmental waters.
Nowadays, the ultra and microfiltration method for trace metals removal from
waters by the addition of water-soluble polymers into the aqueous solutions
has become a significant research area. The choice of watersoluble
macroligands remains important for developing this technology. Sodium
carboxymethyl cellulose (Na-CMC) was selected as complexing agent. The
microfiltration experiments were carried out in stirred dead-end cell. To
separate formed polymer-metal complex Versapor membranes were used. The
concentration of heavy metal ions after microfiltration in aqueous solution
was determined using atomic absorption spectroscopy (AAS). Effects of amount
of complexing agent, pH value, type of anion, ionic strength and operating
pressure on the flux (J) and rejection coefficient (R) were investigated.
Experimental results indicate a considerable influence of the pH, ionic
strength and type of anion on the rejection coefficient, while effect of
amount of complexing agent is relatively insignificant. The Na-CMC used in
the research proved to be very effective, which may be supported by the high
rejection coefficients obtained (99%).
Keywords: microfiltration, complexation, heavy metal ions, wastewater treatment