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http://dx.doi.org/10.4491/KSEE.2014.36.8.554

Application of Montmorillonite as Capping Material for Blocking of Phosphate Release from Contaminated Marine Sediment  

Kang, Ku (Graduate School of Future Convergence Technology, Hankyong National University)
Kim, Young-Kee (Department of Chemical Engineering, Hankyong National University)
Hong, Seong-Gu (Department of Bioresources & Rural systems Engineering, Hankyong National University)
Kim, Han-Joong (Department of Bioresources & Rural systems Engineering, Hankyong National University)
Park, Seong-Jik (Department of Bioresources & Rural systems Engineering, Hankyong National University)
Publication Information
Journal of Korean Society of Environmental Engineers / v.36, no.8, 2014 , pp. 554-560 More about this Journal
Abstract
To investigate the applicability of montmorillonite to capping material for the remediation of contaminated marine sediment, adsorption characteristics of $PO{_4}{^{3-}}$ onto montmorillonite were studied in a batch system with respect to changes in contact time, initial concentration, pH, adsorbent dose amount, competing anions, adsorbent mixture, and seawater. Sorption equilibrium reached in 1 h at 50 mg/L but 3 h was required to reach sorption equilibrium at 300 mg/L. Freundlich model was more suitable to describe equilibrium sorption data than Langmuir model. The $PO{_4}{^{3-}}$ adsorption decreased as pH increased, due to the $PO{_4}{^{3-}}$ competition for favorable adsorption site with OH- at higher pH. The presence of anions such as nitrate, sulfate, and bicarbonate had no significant effect on the $PO{_4}{^{3-}}$ adsorption onto the montmorillonite. The use of the montmorillonite alone was more effective for the removal of the $PO{_4}{^{3-}}$ than mixing the montmorillonite with red mud and steel slag. The $PO{_4}{^{3-}}$ adsorption capacity of the montmorillonite was higher in seawater than deionized water, resulting from the presence of calcium ion in seawater. The water tank elution experiments showed that montmorillonite capping blocked well the elution of $PO{_4}{^{3-}}$, which was not measured up to 14 days. It was concluded that the montmirillonite has a potential capping material for the removal of the $PO{_4}{^{3-}}$ from the aqueous solutions.
Keywords
Montmorillonite; Phosphate; Adsorption; Contaminated Sediment; Reactive Capping;
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Times Cited By KSCI : 2  (Citation Analysis)
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