METHOD FOR TREATING FLUORINE-CONTAINING WASTEWATER, AND APPARATUS FOR TREATING FLUORINE-CONTAINING WASTEWATER

摘要

A method for treating fluorine-containing wastewater according to an embodiment comprises the steps of: bringing the fluorine-containing wastewater into contact with a calcium agent in a reaction vessel to cause the reaction of fluorine in the fluorine-containing wastewater with the calcium agent, thereby producing calcium fluoride in the fluorine-containing wastewater; and subjecting the calcium fluoride to solid/liquid separation in a solid/liquid separation apparatus placed on the downstream side of the reaction vessel to remove the calcium fluoride from the fluorine-containing wastewater, thereby producing primarily-treated water of the fluorine-containing wastewater and a slurry containing the fluoride calcium. The method additionally comprises the steps of: electrodialyzing the primarily-treated water in an electrodialysis apparatus placed on the downstream side of the solid/liquid separation apparatus to concentrate and remove fluorine ions contained in the primarily-treated water, thereby producing finally-treated water of the fluorine-containing wastewater; and washing the solid/liquid separation apparatus with the primarily-treated water.