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http://dx.doi.org/10.11001/jksww.2013.27.6.751

Phosphate Removal in Wastewater by Tobermolite  

Lim, Bongsu (Department of Environmental Engineering, Daejeon University)
Kim, Deahyun (Department of Environmental Engineering, Daejeon University)
Yi, Teawoo (Research Institute of Technology, Hanwha Engineering & Construction Corp.)
Publication Information
Journal of Korean Society of Water and Wastewater / v.27, no.6, 2013 , pp. 751-759 More about this Journal
Abstract
This study is carried out to get the basic design parameters for phospate removal facilites from wastewater by Tobermolite. The phosphate removal by the apatite formation on the surface was affected by several important factors, temperature, ions present in wastewater stream, contact time, recirculation rate, and etc. In case of the temperature, with the increase of temperature, the apatite formation was accelerated. When temperature increased from $15^{\circ}C$ to $35^{\circ}C$, removal efficiency of phosphate increased from 83 % to 93 %. An increase of calcium and fluoride ion content increase the apatite formation, however, bicarbonate and magnesium ion inhibited the crystallization of apatite. As expected, when the recirculation rate was increased from 1 Q to 3 Q, at EBCT (Empty Bed Contact Time) 60min enhanced removal efficiency was observed. The more the recirculation rate increased, the more the removal efficiency increased. According to the results of column experiment using an actual wastewater with low and high phosphate concentration (5 mg/L and 50 mg/L-P), the removal efficiency was 77 % at EBCT of 45 min, and 80 % at 60 min. It was suggested that optimum EBCT was 45 min.
Keywords
EBCT; Phosphate Removal; Tobermolite; Recirculation Rate;
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