BORON FIXATION AGENT AND METHOD FOR TREATING BORON- CONTAINING WASTEWATER

PROBLEM TO BE SOLVED: To obtain a boron fixation agent which can efficiently remove boron from boron-containing wastewater and can reduce the amount of sludge generated by forming the same from a lanthanum compound. SOLUTION: This fixation agent is formed from a lanthanum compound. The lanthanum compound may be a chloride, a nitrate, a sulfate, a carbonate, an acetate, or the like, and the compound alone or a mixture of such compounds may be used, The content of the lanthanum compound in the fixation agent is preferably 20 wt.% or higher, still preferably 28 wt.% or higher, The fixation agent may be in the form of a liquid, an aqueous solution, a powder, flakes, a slurry, or the like, a liquid being preferable in terms of easiness in use. When the agent is solid, it is preferably dissolved in water to be converted into an aqueous solution before being used. The agent may contain substances other than the lanthanum compound.