METHOD AND DEVICE BOTH FOR TREATING WATER

WIPO Patent Application WO/2019/130635

A1

A water treatment method in which metal-ion-containing water is subjected to alkali coagulation/sedimentation at pH 8 or higher, in which a cationic polymeric coagulant and an anionic polymeric coagulant are added successively in this order and, consequently, it becomes possible to produce clearer treated water compared with a case where only an anionic polymeric coagulant is added. A water treatment method comprising the steps of: (i) adding an alkali to metal-ion-containing water of interest and then allowing a metal hydroxide to precipitate at pH 8 or higher to produce a suspended substance; (ii) adding a cationic polymeric coagulant having a cation group content of 30 mol% or less to the water obtained in step i and then adding an anionic polymeric coagulant having an anion group content of 10 mol% or more to the resultant product to produce aggregates of the suspended substance; and (iii) forming a sludge blanket and a layer of clarified water from the water obtained in step ii, then obtaining treated water from the layer of the clarified water and obtaining sludge from the sludge blanket. A water treatment device for performing the method.

HIGAKI RYO (JP)
MAEDA RINTARO (JP)
TOBA YUICHIRO (JP)

PCT/JP2018/028680

July 04, 2019

July 31, 2018

Click for automatic bibliography generation  

ORGANO CORP (JP)

C02F1/56; B01D21/01; B01D21/08; B01D21/24; C02F1/62; C02F1/64

WO2014038537A1

2014-03-13

JP2015066546A	2015-04-13
JPH07973A	1995-01-06
JPH07275606A	1995-10-24
JP2002113473A	2002-04-16
JP2011139997A	2011-07-21
JP2012091079A	2012-05-17

MIYAZAKI Teruo et al. (JP)

View/Download PDF      PDF Help

Previous Patent: GOOD-TEXTURE HEALTHY BOILED NOODLE

Next Patent: ULTRASOUND IMAGING DEVICE, IMAGE PROCESSING DEVICE, AND METHOD