Title:
METHOD FOR TREATING HIGH-HARDNESS DISCHARGED WATER
Document Type and Number:
WIPO Patent Application WO/2017/154624
Kind Code:
A1
Abstract:
A method for treating high-hardness discharged water according to one aspect of the present invention is a method for treating high-hardness discharged water having a calcium hardness degree of 100 or more, said method comprising the steps of: adding an alkali to the high-hardness discharged water; coarsely filtering the alkaline high-hardness discharged water that is produced after the alkali addition step through a filter; and subjecting the alkaline high-hardness discharged water that is produced after the coarse filtration step to membrane filtration through a microfiltration membrane or an ultrafiltration membrane each containing polytetrafluoroethylene as the main component. It is preferred that the pH value of the high-hardness discharged water is adjusted to 8 to 14 inclusive in the alkali addition step. It is preferred that the coarse filtration is carried out using a filter having a retention particle diameter of 1 μm.
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Inventors:
SATO NAGAHISA (JP)
TANAKA HIROMU (JP)
IDA KIYOSHI (JP)
MORITA TORU (JP)
TANAKA HIROMU (JP)
IDA KIYOSHI (JP)
MORITA TORU (JP)
Application Number:
PCT/JP2017/007277
Publication Date:
September 14, 2017
Filing Date:
February 27, 2017
Export Citation:
Assignee:
SUMITOMO ELECTRIC INDUSTRIES (JP)
International Classes:
C02F1/44; B01D24/00; B01D29/01; B01D61/04; B01D61/16; B01D61/58; B01D71/36; C02F1/58
Domestic Patent References:
| WO2009119300A1 | 2009-10-01 | |||
| WO2011016410A1 | 2011-02-10 |
Foreign References:
| JP2013137279A | 2013-07-11 | |||
| JP2010089071A | 2010-04-22 | |||
| JP2009165928A | 2009-07-30 | |||
| JP2013169511A | 2013-09-02 | |||
| JP2012187467A | 2012-10-04 | |||
| JP2014034006A | 2014-02-24 | |||
| JP2015174018A | 2015-10-05 |
Attorney, Agent or Firm:
NAKATA Motomi et al. (JP)
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