The subject invention relates to a permeable membrane system utilized for the separation of fluid components, specifically spiral-wound permeable membrane elements.
Spiral-wound membrane filtration elements well known in the art comprise a laminated structure including a membrane sheet sealed to or around a porous permeate spacer which creates a path for removal of the fluid passing through the membrane to a central tube. This laminated structure is wrapped spirally around the central tube and spaced from itself with a porous feed spacer to allow axial flow of the fluid through the element. The porous feed spacer is placed between the folded layers of membrane sheet to form a leaf, and one or several of these leaves are stacked in between layers of permeate spacer and rolled to create the element. While this feed spacer is necessary to maintain open and uniform axial flow between the laminated structure, it is also a source of flow restriction and pressure drop within the axial flow channel and also presents areas of restriction of flow and contact to the membrane that contribute significantly to membrane fouling via biological growth, scale formation, and particle capture.
Improvements to the design of spiral wound elements have been disclosed by Barger et al. and Bradford et al., which replace the feed spacer with islands or protrusions either deposited or embossed directly onto the outside or active surface of the membrane. This configuration is advantageous in that it maintains spacing for axial flow through the element while minimizing obstruction within the flow channel. It also eliminates the porous feed spacer as a separate component, thus simplifying element manufacture. Patent publication number US2016-0008763-A1 entitled Improved Spiral Wound Element Construction teaches the application of printed patterns on the back side of the active surface of the membrane sheet, or directly on the surface of the permeate spacer.
The following references, each of which is incorporated herein by reference, can facilitate understanding of the invention: U.S. Pat. Nos. 3,962,096; 4,476,022; 4,756,835; 4,834,881; 4,855,058; 4,902,417; 4,861,487; 6,632,357; and US application 2016-0008763-A1.
Embodiments of the present invention provide a membrane for use in a spiral wound permeable membrane system, comprising a membrane having spacing features disposed on a surface of the membrane, wherein the spacing features are configured such that the features direct fluid flow along one or more tortuous paths.
In some embodiments, the spacing features comprise a plurality of substantially parallel line segments disposed in an array wherein the line segments are oriented at an angle other than zero degrees to the direction of fluid flow in the permeable membrane system, the line segments are separated from each other by a first distance along a dimension perpendicular to the overall direction of fluid flow and by a second distance along a dimension parallel to the overall direction of fluid flow, and wherein the line segments are disposed to prevent fluid flow direct from inlet to outlet of the system. In some embodiments, the line segments are 0.01″ to 0.03″ wide, 0.1″ to 0.3″ long, the first distance is 0.4″ to 0.7″, and the second distance is 0.4″ to 0.7″. In some embodiments, the line segments are 0.02″ wide, 0.1875″ long, the first distance is 0.5625″, and the second distance is 0.5625″.
In some embodiments, the spacing features comprise a plurality of chevron shaped features, disposed in a two-dimensional array on the membrane, with each line of the array offset from adjacent lines such that fluid flowing between two chevrons in one line is turned by a chevron in a successive line. In some embodiments, each feature is 0.01″ to 0.03″ in thickness, 0.08″ to 0.2″ in width, 0.1″ to 0.3″ in height, disposed with a gap of 0.4″ to 0.7″ between adjacent features in each line and line spaced 0.4″ to 0.7″ apart. In some embodiments, each feature is 0.02″ in thickness, 0.0938″ in width, 0.1875″ in height, disposed with a gap of 0.5625″ between adjacent features in each line and line spaced 0.5625″ apart.
In some embodiments, the spacing features comprise a plurality of line segments, wherein a first subset of the line segments are oriented at a first angle to the direction from inlet to outlet, and wherein a second subset of the line segments are oriented at a second angle to the direction from inlet to outlet, and wherein the line segments are positioned such that fluid flow in a direction along a line segment in the first subset is redirected by a line segment in the second subset. In some embodiments, the features are 0.01″ to 0.03″ in thickness, with equal length and height of 0.1″ to 0.3″. In some embodiments, the first angle is 35° to 55° and the second angle is 125° to 145°. In some embodiments, the first angle is 45° and the second angle is 135°. In some embodiments, the features are separated by 0.4″ to 0.7″. In some embodiments, the features are separated by 0.5625″. In some embodiments, the first angle is 12.5° to 32.5° and the second angle is 147.5° to 167.5°. In some embodiments, the first angle is 22.5° and the second angle is 157.5°. In some embodiments, the features are separated by 0.19″ to 0.39″.
In some embodiments, the spacing features comprise a first plurality of spacing features extend a first height above the surface of the membrane, and a second plurality of spacing features extend a second height above the surface of the membrane, wherein the second height is less than the first height. In some embodiments, the second height is no more than one half the first height.
In some embodiments, the spacing features are no more than 0.01″ in height.
Some embodiments provide a membrane for use in a spiral wound permeable membrane system, comprising a membrane having spacing features disposed on a surface of the membrane, wherein the spacing features are no more than 0.01″ in height.
In some embodiments, the spacing features are made of one or more of thermoplastics, reactive polymers, waxes, or resins; deposited directly onto the membrane surface.
In some embodiments, the spacing features are made of one or more of high-temperature thermoplastics, metals, or ceramics; formed apart from the membrane surface and then adhered to the membrane surface.
Embodiments of the present invention provide a permeable membrane system comprising a membrane as described herein.
Embodiments of the present invention provide a water treatment facility comprising one or more permeable membrane systems as described herein.
Embodiments of the present invention provide a method of treating water, comprising providing a permeable membrane system as described herein, and passing water to be treated through the permeable membrane system.
Embodiments of the present invention provide a method of making a permeable membrane system, comprising providing a membrane as described herein, and spirally winding the membrane.
Embossing or depositing features onto the surface of the membrane sheet, or onto or into the permeate carrier sheet of a spiral-wound element to provide spacing between adjacent membrane sheets can provide several advantages as compared to feed spacer mesh, including more open flow channels, lower pressure drop, reduced fouling, and the ability to produce thinner feed space than would be practical using a mesh. Thinner feed spacers produce higher fluid shear between the active surfaces of the membrane sheet and can promote higher flux through a unit area of the membrane sheets. The membrane sheet itself can be made with a non-woven porous layer of polypropylene, bonded to a porous layer of polysulfone, with the membrane polymer material cast onto the polysulfone layer. Various other materials and methods can be used to make the membrane sheet. Membrane sheet can be made that provides varying degrees of removal efficiency. Micro filtration membranes can typically remove material as small as about 0.1 micron, typical of bacteria and protozoa, or other contaminants of such size in industrial applications. Ultra filtration membranes can have pore sizes as small as about 0.01 micron and can remove, as an example, viruses from fluid sources. Nano filtration membranes can have pore sizes small enough to remove di-valent ions, but will pass monovalent ions such as sodium and chloride. An example of application of nano filtration is water softening to remove, as an example, calcium carbonate. Reverse osmosis is typically the smallest pore size, and is sufficient to remove mono-valent salts, typically used in desalination applications. Various configurations of these spacer features have been disclosed by Barger et al. and Bradford et al. PCT/US14/18813, incorporated herein by reference, discloses various methods and materials suitable for depositing spacing features on membrane sheets. Those methods and materials can be useful in implementing embodiments of the present invention.
The present invention provides various patterns and configurations of embossed or deposited features that enhance mixing of the fluid in the feed/reject channel. During fluid separation within a spiral-wound element, ions, compounds, or solids can become concentrated at the reject or outlet end of the flow channel and at the membrane surface where separation occurs. Enhanced mixing and in some cases shortened diffusion paths for the fluid can be advantageous because it can counter this concentration of substances at the membrane surface as well as prevent stagnation points where biological fouling can occur. Mixing can also reduce the likelihood of precipitation of solids into scale by reducing the localized concentration of dissolved solids.
Referring to
In another example embodiment of the present invention shown in
A further example embodiment of the present invention comprises an array of angled line segments embossed or deposited on one half of the membrane leaf arranged in a cross-hatched pattern of alternating rows of alternating angles. These features define the feed space and flow paths for liquid through the spiral-wound element. Adjacent rows of these features are staggered such that the open spaces on one row are at least partly aligned with the features of the adjacent row forcing a tortuous path for liquid flow between the features.
Another example embodiment employs printed or deposited spacers in arrays of different heights within a given membrane leaf as shown in
In an example embodiment a very thin array of feed spacing features as in
Changing the feature pattern and spacing to increase pressure drop will also increase mixing which is advantageous in applications where higher shear and mixing can reduce concentration polarization near the membrane surface, such as applications where the solution being filtered is high in total dissolved solids (TDS). For applications with low TDS, it can be more preferable to have more open channels, less mixing, and reduced pressure drop to improve energy efficiency.
The features can comprise any number of materials that are compatible with the separated fluid and the permeate carrier including, but not limited to, thermoplastics, reactive polymers, waxes, or resins. Additionally, materials that are compatible with the separated fluid but not compatible with direct deposition to the permeate carrier, including, but not limited to high-temperature thermoplastics, metals, or ceramics, may be pre-formed, cast, or cut to the proper dimensions and adhered to the surface of the permeate carrier with an adhesive that is compatible with the permeate carrier.
The present invention has been described in connection with various example embodiments. It will be understood that the above description is merely illustrative of the applications of the principles of the present invention, the scope of which is to be determined by the claims viewed in light of the specification. Other variants and modifications of the invention will be apparent to those skilled in the art.
This application is a national stage application under 35 U.S.C. 371 of PCT application PCT/US2018/028453, filed 19 Apr. 2018, which claims priority to U.S. provisional application 62/487,973, filed 20 Apr. 2017. Each of the foregoing is incorporated by reference herein.
Filing Document | Filing Date | Country | Kind |
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PCT/US2018/028453 | 4/19/2018 | WO |
Publishing Document | Publishing Date | Country | Kind |
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WO2018/195367 | 10/25/2018 | WO | A |
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