대한환경공학회지 (Journal of Korean Society of Environmental Engineers)

  • 제35권4호
  • /
  • Pages.257-262
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  • 2013
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  • 1225-5025(pISSN)
  • /
  • 2383-7810(eISSN)
대한환경공학회 (Korean Society of Environmental Engineers)
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알루미늄을 이용한 불화붕산염의 분해 반응 및 불소 처리에 관한 연구

A Study on the Tetrafluoroborate Decomposition Reaction and Removal of Fluoride Using Aluminum

  • 주현종 (경기대학교 일반대학원 환경에너지공학과) ;
  • 김문기 (경기대학교 환경에너지공학과)
  • Joo, Hyun-Jong (Department of Environmental Energy Engineering, Graduate School of Kyonggi University) ;
  • Kim, Moon-Ki (Department of Environmental Energy Engineering, Kyonggi University)
  • 투고 : 2013.03.05
  • 심사 : 2013.03.29
  • 발행 : 2013.04.30
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초록

불산(HF)을 함유한 폐수는 주로 불소이온($F^-$)과 불화붕산염($BF{_4}{^-}$)을 포함하고 있으며, 불산 폐수처리는 보편적으로 칼슘을 이용한 응집 침전 공정을 사용하고 있다. 불소이온은 칼슘이온에 의해 높은 제거효율을 나타내지만 불화붕산염($BF{_4}{^-}$)의 경우 반응성이 낮아 총 불소 제거에 많은 어려움이 있다. 본 연구의 목적은 알루미늄을 이용하여 불화붕산염을 분해하여 총 불소 제거 효율을 향상 시키는데 있다. 불소처리공정 모사 반응기를 이용하여 pH, 알루미늄 주입량, 수온에 따른 불화붕산염의 분해 실험을 실시하였다. 실험결과 알루미늄을 이용한 불화붕산염 분해는 낮은 pH와 높은 수온 그리고 Al/T-F (Aluminum/Total Fluoride) mole ratio가 증가할수록 분해속도도 증가하였으며 반응시간 120분 후에는 큰 농도변화가 없는 것으로 나타났다. 연구결과 알루미늄을 이용한 처리를 통하여 불화붕산염을 포함한 폐수의 처리효율을 향상시킬 수 있을 것으로 판단된다.

The fluorine-containing waste water tends to show a higher removal efficiency through the coagulative precipitation process with calcium. However the tetrafluoroborate produced from the etching process is difficult to remaval due to it's low reactivity with calcium. The objective of this study is improving the efficiency of fluoride ion removal in tetrafluoroborate through decomposing. Research on tetrafluoroborate decomposition depending on reaction pH, temperature, and aluminum dosage were conducted, using a laboratory-scale reactor. The result shows that the reaction of tetrafluoroborate with aluminum is faster with lower pH, higher water temperature, and higher Al/T-F (Aluminum/Total Fluoride) mole ratio. It is found that there was no big change in concentration after over 120 minutes of reaction. This study is to be able to improve the efficiency of tetrafluoroborate and fluoride wastewater treatment by using aluminum.

키워드

참고문헌

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