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Removal of Fluoride Ions from Electronic Industrial Wastewater Using Lime Stone Slurry

초미분말 석회석 현탁액을 이용한 전자산업 폐수 불소이온 제거연구

  • Received : 2017.07.29
  • Accepted : 2017.10.16
  • Published : 2018.06.10

Abstract

This study attempted to utilize ultrafine precipitated calcium carbonate for fluoride removal from the wastewater of electronics industries. An average particle size of the calcium carbonate was $0.96{\mu}m$, and pH of the aqueous slurry was 10 with 70% in mass. The suspension solution showed approximately 2 mL/hr of the sedimentation rate. The present calcium carbonate solution could be comparable to the conventional aqueous calcium source, $Ca(OH)_2$, for the neutralization and removal of fluoride ions. Depending on the amount of an additional alkali source, less amounts of test Ca-source slurries were required to reach the solution pH of 7.0 than that of using the aqueous calcium hydroxide. It was also found from XRD analysis that more calcium fluoride precipitates were formed by the addition of calcium carbonate solution rather than that of calcium hydroxide. In addition, Minteq equilibrium modelling estimated various ion complexes of fluoride and calcium in this process.

Keywords

limestone slurry;fluoride ion;electronic industry wastewater;neutralization;Minteq model

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Acknowledgement

Supported by : 경희대학교