Title:
REVERSE OSMOSIS MEMBRANE SEPARATION APPARATUS
Document Type and Number:
Japanese Patent JP3862816
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To easily produce so-called tasty drinking water from raw liquid containing a large quantity of boron, for example sea water, by lessening the content of boron to a desired value by a two-stage reverse osmosis membrane separation, lessening the contents of evaporation residues such as calcium to desired values, and keeping the pH in the neutral side.
SOLUTION: In a treatment method comprising processes of treating a raw liquid 40 by a first stage reverse osmosis membrane module 41, further treating a part of the filtered liquid by a second-stage reverse osmosis membrane module 42, and mixing the filtered liquid from the second-stage reverse osmosis membrane module 42 and the remaining filtered liquid from the first-stage reverse osmosis membrane module 41, a part of the filtered liquid from the first-stage reverse osmosis membrane module 41 is made to be a downstream side filtered liquid of the reverse osmosis membrane module 41 and the remaining filtered liquid is made to be an upstream side filtered liquid of the reverse osmosis membrane module.
Inventors:
Masahiko Hirose
Application Number:
JP17888997A
Publication Date:
December 27, 2006
Filing Date:
June 18, 1997
Export Citation:
Assignee:
NITTO DENKO CORPORATION
International Classes:
B01D61/02; C02F1/44; B01D61/08; B01D61/10; B01D61/58; (IPC1-7): C02F1/44; B01D61/02; B01D61/08; B01D61/10; B01D61/58
Domestic Patent References:
| JP5302290A | ||||
| JP4145928A |
Attorney, Agent or Firm:
Mikatsu Matsutsuki