Title:
TREATMENT METHOD AND TREATMENT SYSTEM FOR BOROFLUORIDE-CONTAINING WASTE WATER
Document Type and Number:
Japanese Patent JP2016163857
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To efficiently treat borofluoride-containing waste water using polyaluminum chloride.SOLUTION: The method for treating borofluoride-containing waste water of the present invention includes: a borofluoride decomposition stage; a solidification stage; and a solid-liquid separation stage. The borofluoride decomposition stage is a stage of decomposing boron and fluorine in waste water and includes: a step of adding polyaluminum chloride in an amount in accordance with the boron concentration in the waste water to be treated; a step of, if required, regulating the pH of the waste water after the addition of the polyaluminum chloride; and a step of, if required, adding a sulfate ion-containing substance to the waste water after the addition of the polyaluminum chloride. The solidification stage is a stage of adding a calcium compound to the solution obtained by the borofluoride decomposition stage to precipitate the boron and fluorine as solids. The solid-liquid separation stage is a stage of subjecting the solution obtained by the solidification stage to solid-liquid separation.SELECTED DRAWING: Figure 1
Inventors:
MIZUUCHI AYAKO
ISHIKAWA NAOKI
YAMAZAKI MASARU
FUJIWARA TAKESHI
SAKURAI KENICHI
NAKAJIMA TAKAHITO
ISHIKAWA NAOKI
YAMAZAKI MASARU
FUJIWARA TAKESHI
SAKURAI KENICHI
NAKAJIMA TAKAHITO
Application Number:
JP2015044765A
Publication Date:
September 08, 2016
Filing Date:
March 06, 2015
Export Citation:
Assignee:
NSC:KK
International Classes:
C02F1/58
Domestic Patent References:
| JP2014200743A | 2014-10-27 | |||
| JP2010269309A | 2010-12-02 | |||
| JPS614593A | 1986-01-10 | |||
| JP2011088807A | 2011-05-06 | |||
| JPS5128357A | 1976-03-10 | |||
| JPS545628B2 | 1979-03-19 |
Foreign References:
| WO2014132887A1 | 2014-09-04 |