| Removal of Phosphorus in Wastewater by Ca-Impregnated
Activated Alumina |
| Seong Chul Kang, and Byoung Ho Lee† |
| Department of Civil and Environmental Engineering, University of Ulsan, Ulsan 680-749, Korea |
Corresponding Author:
Byoung Ho Lee ,Tel: +82-10-5459-0500, Fax: +82-52-259-2629, Email: bhlee@ulsan.ac.kr
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Received: July 28, 2012; Accepted: November 15, 2012. |
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| ABSTRACT |
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Phosphorus removal during discharge of wastewater is required to achieve in a very high level because eutrophication occurs even
at a very low phosphorus concentration. However, there are limitations in the traditional technologies in the removal of phosphorus at
very low concentration, such as at a level lower than 0.1 mg/L. Through a series of experiments, a possible technology which can remove
phosphate to a very low level in the final effluent of wastewater was suggested. At first Al, Zn, Ca, Fe, and Mg were exposed to phosphate
solution by impregnating them on the surface of activated alumina to select the material which has the highest affinity to phosphate. Kinetic
tests and isotherm tests on phosphate solution have been performed on four media, which are Ca-impregnated activated alumina,
activated alumina, Ca-impregnated loess ball, and loess ball. Results showed that Ca-impregnated activated alumina has the highest
capacity to adsorb phosphate in water. Scanning electron microscope image analysis showed that activated alumina has high void
volume, which provides a large surface area for phosphate to be adsorbed. Through a continuous column test of the Ca-impregnated
activated alumina it was discovered that about 4,000 bed volumes of wastewater with about 0.2 mg/L of phosphate can be treated down
to lower than 0.14 mg/L of concentration. |
| Keywords:
Activated alumina | Ca-impregnation | Loess | Phosphorus removal | Phosphate |
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