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Characteristics of Ion Exchange of Phosphate using Layered Double Hydroxides in Advanced Wastewater Treatment  

Song, Ji-Hyun (Department of CiviI and Environmental Engineering, Sejong University)
Shin, Seung-Kyu (Department of CiviI and Environmental Engineering, Sejong University)
Lee, Sang-Hyup (Environment and Process Technology Division, Korea Institute of Science and Technology)
Park, Ki-Young (Department of Civil and Environmental System Engineering, Konkuk University)
Publication Information
Journal of Korean Society on Water Environment / v.22, no.6, 2006 , pp. 991-995 More about this Journal
Abstract
The layered double hydroxide with the insertion of chloride ions (LDH-Cl), which was synthesized by the co-precipitation method, was applied to investigate the fundamental aspects of the absorptive agent for phosphate removal from wastewater. The adsorption capacity was best described by the Langmuir-FreundIich isotherm, and the estimated isotherm parameters indicate that the LDH-CI capacity for the phosphate removal is much higher than that observed using a natural adsorbent material such iron oxide tailing. The kinetic experiment also showed that the LDH-Cl adsorption reaction rapidly at the adsorptive rate of 0.55 mg-P/g-LDH/min, implying that this adsorbent can be of use in the full-scale applications. The pH had a minimal effect on the LDH adsorption capacity in the range of 5 to 11, although the capacity dropped at the low pHs because of the change in LDH surface properties. Furthermore, other anions such as $Cl^-$ and $NO_3{^-}$ commonly found in the wastewater streams insignificantly affected the phosphate removal efficiencies, while $HCO_3{^-}$ ions had a negative effect on the LDH adsorption capacity due to its high selectivity. The phosphate removal experiment using the actual secondary effluent from a wastewater treatment plant showed the similar decrease in adsorption capacity, indicating that the bicarbonate ions in the wastewater were competing with phosphate for the adsorptive site in the surface of the LDH-Cl. Overall, the synthetic adsorbent material, LDH-Cl, can be a feasible alternative over other conventional chemical agents, since the LDH-Cl exhibits the high phosphate removal capacity with the low sensitivity to other environmental conditions.
Keywords
Ion exchange; Layered double hydroxide; LDH; Phosphate recovery;
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