한국물환경학회지 (Journal of Korean Society on Water Environment)

  • 제23권3호
  • /
  • Pages.371-376
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  • 2007
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  • 2289-0971(pISSN)
  • /
  • 2289-098X(eISSN)
한국물환경학회 (Korean Society on Water Environment)
권호 표지

칼슘 침전법에 의한 불소 처리에 관한 연구

Studies on the Calcium Precipitation Treatment of Fluoride

  • 김영임 (이화여자대학교 환경학과) ;
  • 김동수 (이화여자대학교 환경학과)
  • Kim, Young-Im (Department of Environmental Science and Engineering, Ewha Womans University) ;
  • Kim, Dong-Su (Department of Environmental Science and Engineering, Ewha Womans University)
  • 투고 : 2007.01.09
  • 심사 : 2007.02.22
  • 발행 : 2007.05.30
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초록

The features of precipitating reaction of fluorine have been examined under several aquatic conditions by employing calcium ion as a precipitant. Based on MINTEQ program, fluorine was found to exist in the forms of $H_2F_2$ and HF in strong acidic environment and change into $F^-$ with increasing pH. In the experimental condition, the precipitating reaction of fluorine progressed rapidly within a few minutes after the reaction started and reached its equilibrium in 10 minutes. As the addition of precipitant was increased, removal of fluorine by the formation of precipitate was promoted and its was also enhanced by the rise of pH. The precipitating reaction of fluorine was impeded when its initial concentration was low and X-ray analysis showed that the crystalline structure of precipitate was mainly $CaF_2$ with partly NaF. Coexisting phosphate in solution influenced the fluorine removal by impeding the precipitate formation and similar effect was found when metallic ion such as $Zn^{2+}$ was present with fluorine.

키워드

참고문헌

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