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High recovery spiral wound membrane element
| Details |
Inventors: Holland, Eric C.; Lesan, Fredrick K.; Knappe, Peter H.;
Assignee: Hydranautics (Goleta, CA)
Primary Examiner: Sever; Frank
Assistant Examiner:
Attorney, Agent or Firm: Sughrue, Mion, Zinn, Macpeak & Seas
This invention is a spiral wound membrane filtration element for reverse osmosis, ultrafiltration, microfiltration and filtration of gas mixtures and having a novel radial feed-concentrate flow path and axial permeate discharge allowing conversion of a feed mixture to be varied to any practical desired degree without regard to the membrane elements length while maitaining turbulent or chopped laminar hydrodynamic flow conditions where desired, and a method of using said membrane elements in a filtration process. |
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DETAILED DESCRIPTION OF DRAWINGS FIG.
1 shows a cut-away view of a typical reverse osmosis spiral wound membrane element 1 of this invention within a cylindrical RO pressure vessel 2.
The membrane element 1 is sealed within the pressure vessel 2 with end plates 2a and 2b containing ports for the various feed, concentrate and permeate nozzles and retained in position by ring clamps 10a and 10b.
"O" ring seals 6, 6a, 6b, 6c, 6d, 6e and 6f are shown as solid dark rectangles at the principle points where the membrane element or its various nozzles are connected to ports of the membrane element 1, the pressure vessel 2, its end plates 2a and 2b.
At the center of the RFP membrane element 1 is a porous core tube 3 around which the membrane sheets 15 and spacers are spirally wound.
In FIG.
1, the porous core tube 3 contains a tube plug 4 (an adhesive plug) at the product end of membrane element 1 to prevent mixing of feed and permeate at the product end in the porous plate 5 which serves as a conduit for the product leaving the pressure vessel 2 through a permeate nozzle 11.
Both lateral edges of the membrane element 1 are potted in a low viscosity adhesive 7a and 7b which seals the membrane and spacer ends and bonds the membranes and spacers to the optional end cups 9a and 9b.
In place of end cups 9a and 9b the membrane element 1 can be optionally sealed in a glue "cup" of the same dimensions.
The product-side end cup 9b shown in FIG.
1 is cylindrical in shape and contains an "O" ring seal 6b to prevent leakage of concentrate into the porous plate 5.
To insure sufficient encapsulation of the membrane element 1 it is preferable that the product end cup 9b length be about 6 inches, and about 3 inches in the case of the feed-side end cup 9a.
The two ends of the membrane element 1 are potted in the end cups 9a and 9b individually, usually starting with the product end followed by the feed end, often on the following day.
During the encapsulation process the element may be placed in a pressure chamber and blanketed with nitrogen, at e
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