WATER TREATMENT METHOD

• Main Authors: TAHARA TOSHIO, FUKAYA TARO, YAMAZAKI ATSUSHI
• Format: Patent
• Language: English; Japanese
• Published: 23.03.2015
• Subjects: CHEMICAL OR PHYSICAL PROCESSES, e.g. CATALYSIS OR COLLOIDCHEMISTRY; CHEMISTRY; METALLURGY; PERFORMING OPERATIONS; PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL; THEIR RELEVANT APPARATUS; TRANSPORTING; TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE

PROBLEM TO BE SOLVED: To remove, both efficiently and effectively from an effluent including, as fluorine-containing substances, fluorine ions and tetrafluoroborate ions, these fluorine ions and tetrafluoroborate ions.SOLUTION: The water treatment method of an embodiment includes a first step of obtaining a body of primarily treated water by introducing, into a reaction tank, an effluent including fluorine ions and tetrafluoroborate ions and removing the fluorine ions from the effluent and a second step of adjusting the pH of the primarily treated water within a range of 2.5-5 by introducing the primarily treated water into a pH adjusting tank and adding a pH adjuster to the primarily treated water. This method additionally includes a third step of obtaining a body of secondarily treated water by permeating, through a resin column filled with an aminopolyol-type chelate resin, the pH-adjusted primarily treated water and adsorbing and removing the tetrafluoroborate ions included within the primarily treated water. 【課題】フッ素系物質としてフッ素イオン及びテトラフルオロホウ酸イオンを含む廃水から、これらフッ素イオン及びテトラフルオロホウ酸イオンを効率的かつ効果的に除去する。【解決手段】実施形態の水処理方法は、反応槽内に、フッ化物イオン及びテトラフルオロホウ酸イオンを含む廃水を導入し、廃水中からフッ化物イオンを除去して１次処理水を得る第１のステップと、１次処理水をｐＨ調整槽に導入し、１次処理水に対してｐＨ調整剤を添加して１次処理水のｐＨを２．５〜５の範囲に調整する第２のステップとを具える。また、ｐＨ調整された１次処理水をアミノポリオール型キレート樹脂が充填された樹脂塔に通水して、１次処理水中に含まれるテトラフルオロホウ酸イオンを吸着除去し、２次処理水を得る第３のステップとを具える。【選択図】図１