ENCLOSURE ASSEMBLY AND FILTRATION MODULE FOR FILTERING FLUID
An enclosure assembly configured to receive a plurality of fiber membranes configured to filter fluid may include an elongated tubular member including an elongated wall extending between first and second ends, and a removable hatch coupled to opposing side edges of the elongated wall, thereby forming a hollow enclosure having an interior. The interior of the elongated tubular member may be configured to receive a plurality of fiber membranes configured to filter fluid.
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This PCT International Application claims the benefit of priority of U.S. Provisional Application No. 61/949,939, filed Mar. 7, 2014, the subject matter of which is incorporated herein by reference in its entirety.
DESCRIPTIONField of the Disclosure
The present disclosure relates to enclosure assemblies and enclosure modules for filtration modules and, more particularly, to enclosure assemblies and enclosure modules for filtration modules including fiber membranes.
Background
A wide variety of membrane filtration systems have been used for many years to treat contaminated water, such as, for example, sewage or waste water. Such systems vary in complexity and cost. In an effort to make the treatment processes more cost efficient, submerged membrane filtration processes have been developed in which modules including filtration membranes are immersed in a large feed tank, and filtrate is collected through suction applied to the filtrate side of the membranes. However, the effectiveness of these systems may be largely dependent on having effective ways to clean the surfaces of the membranes, so that they do not become clogged and/or lose their effectiveness. While some of these systems may be relatively effective, there is a continuing desire to provide a membrane filtration system for treating large volumes of fluid in, for example, submerged membrane filtration systems, that more effectively reduces system blockage or loss of effectiveness, for example, by removing materials from filtration membranes that is independent of the flow velocity of the fluid through the system.
An example of a filtration system is disclosed in U.S. Patent Application Publication No. US 2009/0026139 A1 (“the '139 publication”). The '139 publication describes a membrane filtration module of the type having a plurality of permeable, hollow membranes mounted therein, wherein, in use, a pressure differential is applied across the walls of the membranes immersed in a liquid suspension containing suspended solids. The liquid suspension is applied to one surface of the membranes to induce and sustain filtration through the membrane walls. According to the '139 publication, some of the liquid suspension passes through the walls of the membranes to be drawn off as clarified liquid or permeate, and at least some of the solids are retained on or in the membranes or otherwise as suspended solids within the liquid suspension.
Although the filtration system described in the '139 publication may be effective in removing some suspended solids from the filtered liquid, it may still suffer from a number of possible drawbacks similar to those mentioned above. For example, the solids may build up on the membranes, thereby clogging or reducing the effectiveness of the filtration system. As a result, it may be desirable to clean the solids from the membranes to restore the effectiveness of the filtration system. However, the design of the membrane filtration module of the '139 publication may render it difficult or inefficient to clean the membranes without partially or fully disassembling the membrane filtration module, which causes extended periods of unavailability and inefficiency. Moreover, the design of the system of the '139 publication may result in less efficient operation of a pump associated with the membrane filtration module.
The exemplary assemblies, systems, and methods described herein may mitigate or eliminate some of the potential drawbacks described above.
SUMMARYAccording to a first aspect, an enclosure assembly configured to receive a plurality of fiber membranes configured to filter fluid may include an elongated tubular member extending along a longitudinal axis between a first end and a second end of the elongated tubular member. The elongated tubular member may include an elongated wall extending between the first and second ends of the elongated tubular member, with the elongated wall including opposing side edges. The elongated tubular member may further include a removable hatch extending between the first and second ends of the elongated tubular member and coupled to the opposing side edges of the elongated wall, thereby forming a hollow enclosure having an interior configured to provide flow communication between the first and second ends of the elongated tubular member. The interior of the elongated tubular member may be configured to receive a plurality of fiber membranes configured to filter fluid.
According to a further aspect, an enclosure module configured to receive a plurality of bundles of fiber membranes configured to filter fluid may include a plurality of elongated tubular members, each extending along a longitudinal axis between a first end and a second end of the elongated tubular member. The elongated tubular members may each include an elongated wall extending between the first and second ends of the elongated tubular member, with the elongated wall including opposing side edges. The elongated tubular member may further include a removable hatch extending between the first and second ends of the elongated tubular member and coupled to the opposing side edges of the elongated wall, thereby forming a hollow enclosure having an interior configured to provide flow communication between the first and second ends of the elongated tubular member. The interior of each of the elongated tubular members may be configured to receive a bundle of fiber membranes configured to filter fluid.
According to still another aspect, a filtration module configured to filter fluid may include an enclosure assembly configured to receive a plurality of fiber membranes. The enclosure assembly may include an elongated tubular member extending along a longitudinal axis between a first end and a second end of the elongated tubular member. The elongated tubular member may include an elongated wall extending between the first and second ends of the elongated tubular member, with the elongated wall including opposing side edges. The elongated tubular member may further include a removable hatch extending between the first and second ends of the elongated tubular member and coupled to the opposing side edges of the elongated wall, thereby forming a hollow enclosure having an interior configured to provide flow communication between the first and second ends of the elongated tubular member. The filtration module may also include a header associated with the first end of the elongated tubular member and configured to provide flow communication into the interior of the elongated tubular member. The filtration module may further include a bundle of a plurality of fiber membranes coupled to the header and received in the interior of the elongated tubular member, such that the fiber membranes extend along the longitudinal axis of the elongated tubular member, with the fiber membranes being configured to filter fluid.
According to yet another aspect, a method of servicing a filtration module configured to filter fluid may include removing the filtration module from a tank containing fluid. The filtration module may include a plurality of bundles of fiber membranes, with each bundle received in an enclosure assembly. The method may further include at least partially separating a removable hatch from one of the enclosure assemblies to thereby expose one of the bundles of fiber membranes, and servicing the exposed bundle of fiber membranes.
According to still another aspect, a method of reducing build-up of filtered debris on fiber membranes of a bundle of fiber membranes of a filtration module configured to filter fluid, may include providing the bundle of fiber membranes in an elongated tubular member of an enclosure assembly, such that the fiber membranes extend along a longitudinal axis of the elongated tubular member. The method may further include supplying gaseous bubbles at a first end of the elongated tubular member, such that the gaseous bubbles flow from the first end of the elongated tubular member over at least a portion of the fiber membranes toward a second end of the elongated tubular member, thereby dislodging at least some of the filtered debris.
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According to some embodiments, the enclosure assemblies 16 do not include one or more of the first and second ends caps 30 and 32. For example, as shown in
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According to some embodiments, the enclosure module 14 may include first and second ends caps 30 and 32, for example, as shown in
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According to some embodiments, a tab 56 may be associated with, or coupled to, an exterior surface of the second end cap 32 (e.g., on the side adjacent the removable hatch 50). The tab 56 is configured to prevent the removable hatch 50 from separating from the elongated wall 46, unless an end of the removable hatch 50 adjacent the second end cap 32 is deflected away from the exterior surface of the second end cap 32, for example, via a tool such as a screw driver, once the removable hatch 50 has been slid into place to close the enclosure assembly 16. According to some embodiments, the tabs 56 may include a slot 57 (e.g., for receiving the blade of a screwdriver or another tool) to facilitate lifting the removable hatch 50 over the tab 56. According to some embodiments, the first end cap 30 may include a hatch trap 34 configured to receive an end of the removable hatch 50 associated with the first end 42 of the elongated tubular member 40. The hatch trap 34 may take the form of a gutter-shaped flange running along the exterior side of the first end cap 30 that receives the end of the removable hatch 50. In such embodiments, the removable hatch 50 is retained on the elongated wall 46 by the opposing side edges 48 of the elongated wall 46 and between the tab 56 and the hatch trap 34.
The exemplary elongated tubular member 40 has a cross-section perpendicular to the longitudinal axis X (see, e.g.,
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The exemplary multi-piece configuration of the exemplary enclosure assembly 16 may advantageously provide an easy method of inserting fiber membranes 20 and/or bundles 18 into the enclosure assembly 16, which may also result in improved access to the fiber membranes after installation. For example, an enclosure module 14 including multiple enclosure assemblies 14, each containing a bundle 18 of fiber membranes 20 may be removed from a holding tank 22 and laid horizontally on a surface (e.g., the ground), and a bundle 18 contained in the enclosure assembly 16 will move toward a side of the elongated wall 46 opposite the open side of the elongated wall 46, which will provide less chance for interference between the removable hatch 50 and the enclosed bundle 18 during removal and coupling of the removable hatch 50.
As a result, some embodiments of the filtration modules 12 may facilitate ease of servicing of the fiber membranes 20. For example, a method of servicing a filtration module 12 including a plurality of bundles 18 of fiber membranes 20 may include removing the filtration module 12 from a holding tank 22 containing fluid to be filtered. The method may further include at least partially separating the removable hatch 50 from one of the enclosure assemblies 16 to thereby expose one of the bundles 18 of fiber membranes 20, and servicing the exposed bundle 18 of fiber membranes 20. For example, according to some embodiments, the removable hatch 50 may be slid relative to the to the elongated wall 46 to expose at least a portion of the bundle 18 and fiber membranes 20 without completely separating the removable hatch 50 from the enclosure assembly 16. Alternatively, the removable hatch 50 may be completely separated from the enclosure assembly 16, for example, via sliding. Such servicing may include cleaning the fiber membranes 20, either with the fiber membranes remaining in the elongated tubular member 40, or after removal of the fiber membranes 20 from the elongated tubular member 40. In this exemplary manner, it is possible to service the fiber membranes 20 of individual enclosure assemblies 16 independently of the fiber membranes 20 of other enclosure assemblies 16. In addition, according to some embodiments, the removable hatches 50 facilitate servicing of the fiber membranes 20 without it being necessary to substantially or completely disassemble the filtration module 12 or enclosure module 14.
Some embodiments of the filtration modules 12 may serve to reduce the build-up of filtered debris on the fiber membranes 20 of a bundle 18 of fiber membranes 20. For example, a method may include providing the bundle 18 of fiber membranes 20 in an elongated tubular member 40 of an enclosure assembly 16, such that the fiber membranes 20 extend along a longitudinal axis X of the elongated tubular member 40. The method may further include supplying gaseous bubbles 47 at a first end 42 of the elongated tubular member 40 (see, e.g.,
According to some embodiments, the effectiveness of operation of the filtration module 12 may substantially mitigate or prevent the need for human intervention to clean the fiber membranes 20 in some instances, such as, for example, following a catastrophic sludging event associated with the filtration module 12. The efficiency of operation of a filtration module 12 including the enclosure modules 14, according to at least some embodiments, may reduce the amount of down time required for regular servicing (e.g., cleaning, such as backflushing, chemical treatment, relaxation of the fiber membranes 20, and air scouring). According to some embodiments, the flux potential may be enhanced due to, for example, improved air lift recirculation efficiencies.
According to some embodiments, the filtration module 12, including the enclosure assemblies 16 of enclosure module 14, do not include end caps. For example, as shown in
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Exemplary base members 53 also include a pair channels 67 on opposite sides of the recess 61 configured to receive opposing ends 69 of the sleeve member 55 for coupling the sleeve member 55 and base member 53 to one another via, for example, a longitudinal sliding action with respect to one another. In addition, according to some embodiments, the ends 69 of the sleeve member 55 may include features that prevent, or reduce the likelihood, that the sleeve member 55, once assembled with the base member 53, will unintentionally slide relative to the base member 53 as a result of, for example, vibration.
Embodiments that do not include one or more of the end caps may have possible advantages. For example, for some embodiments including an end cap associated with the header, the fiber membranes of the bundles may need to be inserted through the apertures in the end cap during assembly, which may increase time associated with assembly of the filtration module. In addition, the wall thickness associated with the end cap may reduce the cross-section for fluid flow through the filtration module. Further, the end caps may add to the difficulty of assembly of the filtration module due, for example, to the necessity of lining up the end caps with the enclosure assemblies. The end caps may also increase the cost of the filtration module.
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According to some embodiments, the aeration process may include continuously supplying a gas stream for a specific period of time to the gasification device 43 via the aeration chamber 76, and then stopping the gas stream. For example, according to some embodiments, aeration may be activated for a predetermined time (e.g., ranging from about 120 seconds to 24 hours), and thereafter stopped for a predetermined period of time (e.g., ranging from just greater than no time to about 120 seconds). Depending on the length of time the aeration is activated, the cycle may be repeated for one or more cycles throughout each 24-hour period. Other activation timing schemes are contemplated.
The fiber bundle assemblies 72 may include a fiber plate 68 having a plurality of holes 74 through each of which an individual fiber membrane 20 (e.g., a hollow fiber membrane) may extend.
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The foregoing detailed description and examples have been given for clarity of understanding only. No unnecessary limitations are to be understood therefrom. It will be apparent to those skilled in the art that many changes can be made in the embodiments described without departing from the scope of the invention. Thus, the scope of the present invention should not be limited to the structures described herein, but only by the structures described by the language of the claims and the equivalents of those structures.
Claims
1-33. (canceled)
34. An enclosure assembly configured to receive a plurality of fiber membranes configured to filter fluid, the enclosure assembly comprising:
- an elongated tubular member extending along a longitudinal axis between a first end and a second end of the elongated tubular member, the elongated tubular member comprising:
- an elongated wall extending between the first and second ends of the elongated tubular member, the elongated wall comprising opposing side edges; and
- a removable hatch extending between the first and second ends of the elongated tubular member and coupled to the opposing side edges of the elongated wall, thereby forming a hollow enclosure having an interior configured to provide flow communication between the first and second ends of the elongated tubular member,
- wherein the interior of the elongated tubular member is configured to receive a plurality of fiber membranes configured to filter fluid, wherein said hollow enclosure substantially surrounds said plurality of fiber membranes to provide confinement of gaseous bubbles released from a gasification device, wherein said fiber membranes are arranged in bundles, and wherein said gasification device is configured to release gaseous bubbles, such that the gaseous bubbles flow from the first end of the elongated tubular member and along the fiber membranes.
35. The enclosure assembly of claim 34, further comprising a feed gap adjacent said first end, wherein said feed gap is configured to provide influx of said fluid into said hollow enclosure in association with the release of gaseous bubbles.
36. The enclosure assembly of claim 34, wherein an interior side of the elongated wall is devoid of seams transverse with respect to the longitudinal axis of the elongated tubular member.
37. The enclosure assembly of claim 36, wherein the cross-section of the elongated tubular member comprises rounded interior surfaces.
38. The enclosure assembly of claim 34, wherein the elongated wall has a cross-section perpendicular to the longitudinal axis, and wherein the cross-section of the elongated wall is at least one of concave with respect to the interior of the elongated tubular member, channel-shaped, U-shaped, and or C-shaped.
39. The enclosure assembly of claim 34, wherein the removable hatch comprises opposing hatch edges, and wherein the opposing hatch edges and the opposing side edges of the elongated wall are configured such that the removable hatch is coupled to the elongated wall and separated from the elongated wall via sliding the removable hatch relative to the elongated wall in a direction substantially parallel to the longitudinal axis.
40. An enclosure module configured to receive a plurality of bundles of fiber membranes configured to filter fluid, the enclosure module comprising:
- a plurality of elongated tubular members, each extending along a longitudinal axis between a first end and a second end of the elongated tubular member, the elongated tubular members each comprising:
- an elongated wall extending between the first and second ends of the elongated tubular member, the elongated wall comprising opposing side edges; and
- a removable hatch extending between the first and second ends of the elongated tubular member and coupled to the opposing side edges of the elongated wall, thereby forming a hollow enclosure having an interior configured to provide flow communication between the first and second ends of the elongated tubular member,
- wherein the interior of each of the elongated tubular members is configured to receive a bundle of fiber membranes configured to filter fluid, wherein said hollow enclosure substantially surrounds said plurality of fiber membranes to provide confinement of gaseous bubbles released from a gasification device, wherein said fiber membranes are arranged in bundles, and wherein said gasification device is configured to release gaseous bubbles, such that the gaseous bubbles flow from the first end of the elongated tubular member and along the fiber membranes.
41. The enclosure module of claim 40, wherein the removable hatches of the respective elongated tubular members are accessible from a common side of the enclosure module.
42. The enclosure module of claim 40, wherein the enclosure module is configured such that fluid flowing from the first end of a first of the elongated tubular members is prevented from flowing from the interior of the first elongated tubular member to the interior of a second elongated tubular member without first flowing from the second end of the first elongated tubular member.
43. The enclosure module of claim 40, further comprising a feed gap adjacent said first end, wherein said feed gap is configured to provide influx of said fluid into said hollow enclosure in association with the release of gaseous bubbles.
44. The enclosure module of claim 40, wherein the filtration module comprises at least three elongated tubular members.
45. The enclosure module of claim 44, wherein the elongated tubular members are coupled to one another via a coupling mechanism.
46. A filtration module configured to filter fluid, the filtration module comprising: an enclosure assembly configured to receive a plurality of fiber membranes, the enclosure assembly comprising:
- an elongated tubular member extending along a longitudinal axis between a first end and a second end of the elongated tubular member, the elongated tubular member comprising:
- an elongated wall extending between the first and second ends of the elongated tubular member, the elongated wall comprising opposing side edges;
- a removable hatch extending between the first and second ends of the elongated tubular member and coupled to the opposing side edges of the elongated wall, thereby forming a hollow enclosure having an interior configured to provide flow communication between the first and second ends of the elongated tubular member;
- a header associated with the first end of the elongated tubular member and configured to provide flow communication into the interior of the elongated tubular member; and
- a bundle of a plurality of fiber membranes coupled to the header and received in the interior of the elongated tubular member, such that the fiber membranes extend along the longitudinal axis of the elongated tubular member, the fiber membranes being configured to filter fluid, wherein said hollow enclosure substantially surrounds said plurality of fiber membranes to provide confinement of gaseous bubbles released from a gasification device, wherein said fiber membranes are arranged in bundles, and wherein said gasification device is associated with the header and configured to release gaseous bubbles, such that the gaseous bubbles flow from the first end of the elongated tubular member and along the fiber membranes.
47. The filtration module of claim 46, further comprising a feed gap adjacent said first end, wherein said feed gap is configured to provide influx of said fluid into said hollow enclosure in association with the release of gaseous bubbles.
48. The filtration module of claim 46, further comprising a fiber plate configured to associate the plurality of fiber membranes with the header.
49. The filtration module of claim 46, further comprising:
- a plurality of the enclosure assemblies, each of the enclosure assemblies being coupled to an adjacent enclosure assembly via a coupling mechanism; and
- a plurality of the bundles of fiber membranes, each of the bundles of fiber membranes being received in a respective enclosure assembly.
50. The filtration module of claim 46, further comprising a first riser pipe and a second riser pipe, wherein the first and second riser pipes are located at opposite ends of the filtration module.
51. The filtration module of claim 50, wherein the first and second riser pipes are coupled to the opposite ends of the filtration module via riser coupling assemblies.
52. A method of reducing build-up of filtered debris on fiber membranes of a bundle of fiber membranes of a filtration module of claim 46 configured to filter fluid, the method comprising:
- providing the bundle of fiber membranes in an elongated tubular member of an enclosure assembly, such that the fiber membranes extend along a longitudinal axis of the elongated tubular member; and
- supplying gaseous bubbles at a first end of the elongated tubular member, such that the gaseous bubbles flow from the first end of the elongated tubular member over at least a portion of the fiber membranes toward a second end of the elongated tubular member, thereby dislodging at least some of the filtered debris.
Type: Application
Filed: Mar 6, 2015
Publication Date: Jun 22, 2017
Applicant: Koch Membrane Systems, Inc. (Wilmington, MA)
Inventors: Taylor Johnson (Wilmington, MA), David M. Colby (Wilmington, MA), Manwinder Singh (Wilmington, MA)
Application Number: 15/123,409