Treatment system having spiral membrane element and method for operating the treatment system
First Claim
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1. A treatment system comprising:
- a spiral membrane element including a porous hollow tube, and an envelope-like separation membrane wound on an outer circumferential surface of said porous hollow tube, said spiral membrane element capable of being back-washed under a back pressure higher than 0.05 MPa but not higher than 0.3 MPa;
a reverse osmosis membrane separation device provided on a downstream side of said spiral membrane element; and
a washing liquid supply system provided so that at least a part of permeated liquid or concentrated liquid obtained from said reverse osmosis membrane separation device at the time of filtration by said spiral membrane element is supplied as washing liquid to said spiral membrane element at the time of washing said spiral membrane element.
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Abstract
At the time of back washing of a treatment system, filtrate 2 is reverse-osmosis-filtrated by a reverse osmosis membrane separation device 51 so as to be separated into permeate 3 and concentrate 4. The concentrate 4 obtained from the reverse osmosis membrane separation device 51 is supplied as washing water into a spiral membrane element 10 through pipes 21 and 21a. On this occasion, the concentrate 4 is pressurized by a supply pump 104, so that a separation membrane is back-washed under a back pressure higher than 0.05 MPa but not higher than 0.3 MPa.
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12 Claims
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1. A treatment system comprising:
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a spiral membrane element including a porous hollow tube, and an envelope-like separation membrane wound on an outer circumferential surface of said porous hollow tube, said spiral membrane element capable of being back-washed under a back pressure higher than 0.05 MPa but not higher than 0.3 MPa;
a reverse osmosis membrane separation device provided on a downstream side of said spiral membrane element; and
a washing liquid supply system provided so that at least a part of permeated liquid or concentrated liquid obtained from said reverse osmosis membrane separation device at the time of filtration by said spiral membrane element is supplied as washing liquid to said spiral membrane element at the time of washing said spiral membrane element. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method of operating a treatment system including a spiral membrane element, and a reverse osmosis membrane separation device provided on a downstream side of said spiral membrane element, said spiral membrane element having a porous hollow tube, and an envelope-like separation membrane wound on an outer circumferential surface of said porous hollow tube, said spiral membrane element capable of being back-washed under a back pressure higher than 0.05 MPa but not higher than 0.3 MPa, said method comprising the step of:
supplying at least a part of permeated liquid or concentrated liquid obtained from said reverse osmosis membrane separation device at the time of filtration by said spiral membrane element, as washing liquid, to said spiral membrane element at the time of washing said spiral membrane element. - View Dependent Claims (8, 9, 10, 11, 12)
Specification