| 摘要 |
PURPOSE:To remove and reduce effectively fluorine ions to less than the effluent standard with good reproducibility even when the concn. of the fluorine ions is low by bringing water to be treated contg. fluorine ions into contact with CaF2 alone or both of CaCO3 and CaF2. CONSTITUTION:Water to be treated contg. fluorine ions is brought into contact with CaF2 alone or both of CaCO3 and CaF2. Namely, fluorine ions can be effectively removed by bringing neutral waste water into contact with CaCO3 alone or by neutralizing acidic waste water and then bringing the waste water into contact with CaF2. When CaCO3 is used for neutraization, a flocculant such as Al polychloride is used, and fluorine ions are completely removed without using any special pH regulators. Moreover, CaCO3 and CaF2 as the treating agents can be circulated and reutilized, and hence the treating cost can be reduced.
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