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http://dx.doi.org/10.11001/jksww.2013.27.5.631

Phosphate removal using novel combined Fe-Mn-Si oxide adsorbent  

Maeng, Minsoo (Dept. of Civil and Environ. Eng., Dankook Univ.)
Lee, Haegyun (Dept. of Civil and Environ. Eng., Dankook Univ.)
Dockko, Seok (Dept. of Civil and Environ. Eng., Dankook Univ.)
Publication Information
Journal of Korean Society of Water and Wastewater / v.27, no.5, 2013 , pp. 631-639 More about this Journal
Abstract
The removal of phosphate from surface water is becoming increasingly vital to prevent problems such as eutrophication, particularly near urban areas. Recent requirements to reduce high concentrations of phosphate rely on physicochemical methods and adsorbents that must be effective even under strict conditions. The phosphate removal efficiencies of two adsorbents, Fe-Mn-Si oxide and Fe-Mn oxide, were investigated and the data used to compare kinetics and isotherm models. The maximum adsorption capacities of the two adsorbents were 47.8 and 35.5 mg-$PO{_4}^{3-}/g$, respectively. Adsorptions in both cases were highly pH dependent; i.e., when the pH increased from 3 to 9, the average adsorption capacities of the two adsorbents decreased approximately 32.7 % and 20.3 %, respectively. The Freundlich isotherm model fitted the adsorption of Fe-Mn-Si oxide more closely than did the Langmuir model. Additionally, anionic solutions decreased adsorption because of competition with the anions in the adsorbing phosphate. Although affected by the presence of competing anions or a humic substance, Fe-Mn-Si oxide has better adsorption capacity than Fe-Mn oxide.
Keywords
adsorbent; Fe-Mn-Si; Freundlich; Langmuir; phosphate; physicochemical;
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