METHOD AND APPARATUS FOR REMOVING ION IN FLUID BY CRYSTALLIZATION

Title:

METHOD AND APPARATUS FOR REMOVING ION IN FLUID BY CRYSTALLIZATION

Document Type and Number:

WIPO Patent Application WO/2004/067139

Kind Code:

A1

Abstract:

A method and an apparatus for removing an ion to be removed in a fluid to be treated by the crystallization as crystal particles of a slightly soluble salt of the ion in a crystallization reaction vessel, characterized in that a chemical required for the crystallization is added to a part of a treated fluid flowing out from the crystallization reaction vessel and is dissolved therein and the resultant fluid is fed to the crystallization reaction vessel as a circulating fluid, wherein the fluid to be treated and the circulating fluid are introduced into the crystallization reaction vessel in the direction of the tangent to the cross section of the vessel. The method and the apparatus, which are embodiments of the present invention, can be used for improving the efficiency of the recovery of phosphorus.

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Inventors:

SHIMAMURA KAZUAKI (JP)
TANAKA TOSHIHIRO (JP)

Application Number:

PCT/JP2004/000437

Publication Date:

August 12, 2004

Filing Date:

January 20, 2004

Export Citation:

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Assignee:

EBARA CORP (JP)
SHIMAMURA KAZUAKI (JP)
TANAKA TOSHIHIRO (JP)

International Classes:

B01D9/00; C01B25/00; C02F1/52; C02F1/00; C02F1/38; (IPC1-7): B01D9/02; C01B25/32; C01B25/45; C01F11/22; C02F1/58

Foreign References:

JP2002370094A	2002-12-24
JP2002159977A	2002-06-04
JP2002336875A	2002-11-26
JPS6193893A	1986-05-12

Other References: