METHOD AND APPARATUS FOR TREATING BOROFLUORIDE-CONTAINING WATER

摘要

Borofluoride-containing water is treated without carrying out warming so as to highly remove boron as well as fluorine therefrom. A method for treating borofluoride-containing water, which comprises: a first step of adding an aluminum compound to the borofluoride-containing water to decompose a borofluoride at pH 1 to 4; a second step of adding a calcium compound to treated water obtained in the first step to react the treated water with the calcium compound at pH 7 to 13, thereby producing an insoluble substance; and a third step of separating the insoluble substance into a solid material and a liquid material. The aluminum compound is added in such a manner that the Al/F ratio becomes 1.2 to 2.5 (by mole). The calcium compound is added in such a manner that the Ca/Al ratio becomes 2.5 to 4.0 (by mole). Each of the treatment temperature employed in the first step and the treatment temperature employed in the second step is 10 to 35˚C.