ミニマムエミッションを指向したフッ化カルシウム法による廃液中フッ化物イオンの高度処理  [in Japanese] Minimum-Emission-Oriented Method for Calcium Fluoride for High-Quality Treatment of Wastewater Containing Fluoride Ion  [in Japanese]

Access this Article

Search this Article

Author(s)

    • 袋布 昌幹 TAFU Masamoto
    • 富山工業高等専門学校環境材料工学科 Department of Ecomaterials Engineering, Toyama National College of Technology
    • 丁子 哲治 CHOHJI Tetsuji
    • 富山工業高等専門学校環境材料工学科 Department of Ecomaterials Engineering, Toyama National College of Technology

Abstract

Wastewater containing fluoride is released by various industries. In 2001, the effluent standard for fluoride was revised from 15 to 8 mg·<i>l</i><sup>-1</sup> in Japan. The aim of this study was to develop a simplified method for high-quality treatment of fluoride in wastewater. The calcium fluoride method is one of the conventional methods of removing fluoride from wastewater. However, the concentration of fluoride in the effluent obtained by this method has not been considered suitable based on the new effluent standard. In this paper, the effect of CO<sub>2</sub> in the atmosphere on the reaction between calcium ion and fluoride ion was assessed based on chemical equilibrium. It is found that CO<sub>2</sub> in the atmosphere interferes with fluoride removal efficiency and produces a large amount of sludge by forming calcium carbonate. In order to confirm these phenomena, experiments using real wastewater under normal and degassed conditions were carried out not only by measuring the fluoride concentration in the wastewater, but also by characterizing the properties of the formed sludge. As a result, the calcium fluoride method under degassed conditions is suggested to be a very promising method for treatment of wastewater containing fluoride from the viewpoint of minimum emission.

Journal

  • Journal of Japan Society on Water Environment

    Journal of Japan Society on Water Environment 26(1), 33-38, 2003-01-10

    Japan Society on Water Environment

References:  21

Cited by:  2

Codes

  • NII Article ID (NAID)
    10010225304
  • NII NACSIS-CAT ID (NCID)
    AN10372439
  • Text Lang
    JPN
  • Article Type
    Journal Article
  • ISSN
    09168958
  • NDL Article ID
    6428870
  • NDL Source Classification
    ZN5(科学技術--建設工学・建設業--都市工学・衛生工学)
  • NDL Call No.
    Z16-1045
  • Data Source
    CJP  CJPref  NDL  J-STAGE 
Page Top