한국물환경학회지 (Journal of Korean Society on Water Environment)

  • 제22권6호
  • /
  • Pages.991-995
  • /
  • 2006
  • /
  • 2289-0971(pISSN)
  • /
  • 2289-098X(eISSN)
한국물환경학회 (Korean Society on Water Environment)
권호 표지

하수고도처리에서 층상이중수화물을 이용한 인산 이온교환 특성

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

  • 송지현 (세종대학교 토목환경공학과) ;
  • 신승규 (세종대학교 토목환경공학과) ;
  • 이상협 (한국과학기술연구원 환경공정연구부) ;
  • 박기영 (건국대학교 사회환경시스템공학과)
  • 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)
  • 투고 : 2006.02.23
  • 심사 : 2006.08.23
  • 발행 : 2006.11.30
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초록

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.

키워드

과제정보

연구 과제 주관 기관 : 수처리선진화사업단

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