Title:
MEMBRANE SEPARATION PROCESS
Document Type and Number:
WIPO Patent Application WO/2010/050325
Kind Code:
A1
Abstract:
A process which comprises adding an alkaline solution of a phenolic high-molecular compound to raw water, adding an inorganic flocculant to the resulting raw water to conduct flocculation treatment, subjecting the treated water to solid-liquid separation, and then subjecting the water obtained by the solid-liquid separation to membrane separation, wherein the quality of membrane feed water is improved, so that the membrane separation can be continuously conducted stably and efficiently for a long period. The quality of membrane feed water can be improved by diluting an alkaline solution of a phenolic high-molecular compound to a prescribed concentration and adding the diluted solution to raw water, said phenolic high-molecular compound being an alkali-soluble high-molecular compound which has a phenolic hydroxyl group and which is insolubilized in a neutral region and/or in the presence of a salt in a high concentration.
Inventors:
OOI YASUHIRO (JP)
TANAKA YU (JP)
TADA KEIJIRO (JP)
TANAKA YU (JP)
TADA KEIJIRO (JP)
Application Number:
PCT/JP2009/066648
Publication Date:
May 06, 2010
Filing Date:
September 25, 2009
Export Citation:
Assignee:
KURITA WATER IND LTD (JP)
OOI YASUHIRO (JP)
TANAKA YU (JP)
TADA KEIJIRO (JP)
OOI YASUHIRO (JP)
TANAKA YU (JP)
TADA KEIJIRO (JP)
International Classes:
C02F1/44; B01D21/01; C02F1/52; C02F1/56
Foreign References:
| JPS51759A | 1976-01-06 | |||
| JP2004113983A | 2004-04-15 | |||
| JP2007007563A | 2007-01-18 | |||
| JPS6118408A | 1986-01-27 | |||
| JP2005205403A | 2005-08-04 |
Attorney, Agent or Firm:
SHIGENO, Tsuyoshi (JP)
Takeshi Shigeno (JP)
Takeshi Shigeno (JP)
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