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Title:
REVERSE OSMOSIS MEMBRANE SEPARATION APPARATUS
Document Type and Number:
Japanese Patent JP2013043147
Kind Code:
A
Abstract:

To provide a reverse osmosis membrane separation apparatus capable of improving a recovery rate while suppressing precipitation of silica-based scale.

The reverse osmosis membrane separation apparatus 1 includes: a reverse osmosis membrane module 5 separating supply water W1 into permeated water W2 and concentrated water W3; a temperature detection means 4 detecting a temperature of the supply water W1; and a control part 10 alternately conducting a high recovery rate operation mode and a low recovery rate operation mode. In the high recovery rate operation mode, (i) a reference concentration rate of silica in the concentrated water W3 is calculated based on silica concentration of the supply water W1 acquired beforehand and silica solubility determined in accordance with the detected temperature value from the temperature detection means 4, and (ii) a flow rate of the supply water W1 supplied to the reverse osmosis membrane module 5 is controlled so that an actual concentration rate of the silica in the concentrated water W3 exceeds the reference concentration rate. In the low recovery rate operation mode, the flow rate of the supply water W1 supplied to the reverse osmosis membrane module 5 is controlled so that the actual concentration rate of the silica in the concentrated water W3 becomes the reference concentration rate or lower.


Inventors:
MANABE ATSUYUKI
WATANABE HAYATO
Application Number:
JP2011000184032
Publication Date:
March 04, 2013
Filing Date:
August 25, 2011
Export Citation:
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Assignee:
MIURA KOGYO KK
International Classes:
B01D61/12; C02F1/44
Domestic Patent References:
JP2011147899A2011-08-04
JP2006218341A2006-08-24
JP2008237972A2008-10-09
JP2006334470A2006-12-14
JP2005296945A2005-10-27
JPH11300178A1999-11-02
JP2011147899A2011-08-04
JP2006218341A2006-08-24
JP2008237972A2008-10-09
JP2006334470A2006-12-14
JP2005296945A2005-10-27
JPH11300178A1999-11-02
Attorney, Agent or Firm:
岩池 満
加藤 竜太



 
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