Fujitsu Corporation

Satoshi Kezuka

Takayuki Sadakata

A process and apparatus for treating a fluorine-containing waste solution that is able to maintain a high treatment volume while also facilitating easy maintenance. A calcium salt such as calcium hydroxide and an inorganic coagulant are added with timing to the fluorine-containing waste solution, followed by filtration of said waste solution by cross-flow filtration.

Process for treating fluorine-containing waste solution

Fluorine-containing water is treated by contacting the fluorine-containing water with calcium carbonate to react the fluorine in the fluorine-containing water with the calcium carbonate and fix it as calcium fluoride. After the fluorine-containing water is contacted with the calcium salt in the reaction tank to react the fluorine in the fluorine-containing water with the calcium salt and fix it as calcium fluoride, it is subjected to solid/liquid separation, and the treated water is removed while a portion of the sludge concentrated by the solid/liquid separation is returned to the reaction tank.

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Kawasaki, Japan

Satoshi Kezuka