REVERSE OSMOSIS SEPARATION DEVICE

    公开(公告)号:JPH09276663A

    公开(公告)日:1997-10-28

    申请号:JP11416096

    申请日:1996-04-10

    Abstract: PROBLEM TO BE SOLVED: To provide a reverse osmosis separation device designed to save on energy when concentrating untreated liquid such as sea water through a multistage process. SOLUTION: An untreated liquid, pressurized by a high pressure pump 1, is supplied to a reverse osmosis membrane module unit 2 as a first stage, then is separated as a concentrated liquid 3 and a filtrate 4, and the concentrated liquid 3 is supplied to a next stage reverse osmosis membrane module unit 5. In this module unit 5, the concentrated liquid 7 is separated as a concentrated liquid 7 and a filtrate 8. In this case, the concentrated liquid 3 supplied to the next stage reverse osmosis membrane module unit 5 is supplied through an energy exchange-type pressure increasing device. Thus the pressure of the concentrated liquid 3 is increased by the device 6, that is, the device 6 increases the pressure of the concentrate liquid 3 using a pressure energy possessed by the concentrated liquid 7 discharged from the next stage reverse osmosis membrane module unit 5, resulting in the saving of the energy.

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