Title:
POROUS POLYMER MEMBRANE FOR WASTE WATER TREATMENT
Document Type and Number:
WIPO Patent Application WO/2013/022016
Kind Code:
A1
Abstract:
[Problem] To provide a flat porous polymer membrane for use in membrane bioreactors (MBR), which is suitable for waste water treatment and has a structure that achieves high membrane performance while maintaining the strength required to endure long-term use. [Solution] A flat porous polymer membrane for obtaining a filtrate from fluid in an activated sludge after being immersed in said activated sludge, wherein the following conditions A) to E) are satisfied: A) the pure water flux is in the range of 20-50mL/cm2/min/bar; B) the bubble point in the pure water is in the range of 0.08-0.3MPa; C) the porous polymer membrane comprises polyvinyl chloride and/or chlorinated polyvinyl chloride; and D) observed under an electron microscope at a magnification of 5000x, a cross section of the porous polymer membrane has a structure that becomes gradually more sparse from the surface that comes into contact with the liquid undergoing treatment to an internal layer, and the void content of a polymer network of the internal layer is 1-3 times that of parts in the vicinity of the surface that comes into contact with the liquid undergoing treatment.
Inventors:
MORITA JUNSUKE (JP)
TAJI AKINA (JP)
KITAGAWA TOORU (JP)
TAJI AKINA (JP)
KITAGAWA TOORU (JP)
Application Number:
PCT/JP2012/070161
Publication Date:
February 14, 2013
Filing Date:
August 08, 2012
Export Citation:
Assignee:
TOYO BOSEKI (JP)
MORITA JUNSUKE (JP)
TAJI AKINA (JP)
KITAGAWA TOORU (JP)
MORITA JUNSUKE (JP)
TAJI AKINA (JP)
KITAGAWA TOORU (JP)
International Classes:
B01D71/30; B01D69/06; B01D69/12; B01D71/22; C02F1/44; D06M15/248
Foreign References:
JP2003144869A | 2003-05-20 | |||
JP2003251152A | 2003-09-09 | |||
JPH0975694A | 1997-03-25 | |||
JP2005330349A | 2005-12-02 | |||
JPH03174451A | 1991-07-29 | |||
JP2002292254A | 2002-10-08 |
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