CA2543681A1 - Filter underdrain system for backwash flow and method for measuring same - Google Patents

Filter underdrain system for backwash flow and method for measuring same Download PDF

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Publication number
CA2543681A1
CA2543681A1 CA002543681A CA2543681A CA2543681A1 CA 2543681 A1 CA2543681 A1 CA 2543681A1 CA 002543681 A CA002543681 A CA 002543681A CA 2543681 A CA2543681 A CA 2543681A CA 2543681 A1 CA2543681 A1 CA 2543681A1
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CA
Canada
Prior art keywords
panel
underdrain
water inlet
filter
panel member
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
CA002543681A
Other languages
French (fr)
Other versions
CA2543681C (en
Inventor
David Hambley
Philip Hambley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Individual filed Critical Individual
Priority to CA2543681A priority Critical patent/CA2543681C/en
Publication of CA2543681A1 publication Critical patent/CA2543681A1/en
Application granted granted Critical
Publication of CA2543681C publication Critical patent/CA2543681C/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/001—Making filter elements not provided for elsewhere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/02—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration
    • B01D24/20—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof with the filter bed stationary during the filtration the filtering material being provided in an open container
    • B01D24/24—Downward filtration, the container having distribution or collection headers or pervious conduits
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D24/00—Filters comprising loose filtering material, i.e. filtering material without any binder between the individual particles or fibres thereof
    • B01D24/46—Regenerating the filtering material in the filter
    • B01D24/4631—Counter-current flushing, e.g. by air
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/34—Seals or gaskets for filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/44—Special measures allowing the even or uniform distribution of fluid along the length of a conduit

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)
  • Filtering Of Dispersed Particles In Gases (AREA)

Abstract

A filter underdrain system and a method for measuring the water flow through the underdrain filter system. The apparatus includes panel members assembled to form a perforate grid on the filter base structure of an underdrain block. The panels are generally rectangular and have an upper and lower surface. Multiple apertures are provided in the panel member. The number and/or size of the apertures are dimensioned to prevent the egress of filter media and to obtain substantially uniform backwash flow in the underdrain thereby reducing or eliminating water maldistribution.

Claims (34)

1. A filter underdrain assembly for controlling backwash water flow from a backwash water inlet comprising a plurality of panel members forming a grid like underdrain, each panel member having a plurality of apertures, the cross-sectional area of said apertures in said panel members varying between said panel members, said apertures of said panel members being located further away from said backwash water inlet having a lesser cross-sectional area relative to said cross-sectional area of said apertures of said panel members closer to said backwash water inlet.
2. A filter underdrain assembly as in claim 1 wherein said apertures in said panel members are elongate slots.
3. A filter underdrain assembly as in claim 2 and further comprising an air passageway in said panel members.
4. A filter underdrain assembly as in claim 3 wherein said panel member has upper and lower surfaces, said air passageway releasing air below said upper surface of said panel member.
5. A filter underdrain assembly as in claim 3 wherein said air passageway releases air above said upper surface of said panel member.
6. A filter underdrain assembly as in claim 3 wherein said air passageway takes the form of a hat section, said hat section having perforations positioned below said upper surface of said panel member.
7. A filter underdrain assembly as in claim 3 wherein said air passageway takes the form of a hat section, said air passageway having perforations extending through said upper surface of said panel member.
8. A panel member for controlling backwash water flow from underdrain blocks of an underdrain filter assembly, said panel member having a plurality of apertures therein of predetermined cross-sectional area to allow passage of water therethrough, an attachment for mechanically positioning said panel member on said underdrain filter assembly and a sealing member to provide a substantially watertight seal between said panel member and said underdrain filter assembly.
9. A panel member as in claim 8 and further comprising an air passageway and perforations in said air passageway for releasing air under pressure from said air passageway.
10. A panel member as in claim 9 wherein said perforations in said air passageway are located below the supper surface of said panel member.
11. A panel member as in claim 9 wherein said perforations in said air passageway extend through the upper surface of said panel member.
12. A panel member as in claim 9 wherein said perforations take the form of elongate slots.
13. Filter underdrain apparatus for controlling backwash water flow maldistribution from a backwash water inlet in an underdrain assembly comprising a plurality of panel elements assembled adjacent each other to form a grid like underdrain, each panel element having multiple punched bridges in a surface thereof, each bridge defining a pair of water inlet/outlet slotted apertures and wherein the number and size of said punched bridges and slotted apertures respectively can be varied from panel element to panel element, said panel elements furthest away from said backwash water inlet having a lesser number of bridges or smaller slotted apertures from said panel elements nearer to said backwash water inlet, said panel elements being operable to provide a substantially equalised water flow through the underdrain assembly from said panel elements.
14. Apparatus according to claim 13 wherein said multiple punched bridges are sized to substantially prevent the passage of filter media therethrough.
15. Apparatus according to claim 14 and further comprising an attachment for attaching each of said panel elements to adjacent panel elements and securing said panel members to said underdrain.
16. Apparatus according to claim 15 and further comprising a seal for forming a substantially watertight seal between a surface of each of said panel elements and said underdrain.
17. Apparatus according to claim 13 wherein said panel member comprises a generally rectangular open box structure defined by a pair of parallel side walls, a pair of parallel end walls transverse to said side walls and a generally flat surface member communicating with the side and end walls along one edge thereof.
18. Apparatus according to claim 17 and further comprising a perimeter flange of generally "L"
shaped cross-section extending perpendicularly outward from said side and end walls of said panel member, said perimeter flange having a vertical wall, said vertical wall being substantially parallel to the side and end walls of said panel member.
19. Apparatus according to claim 18 and further comprising a seal attached to said flat surface of said perimeter flange.
20. Apparatus according to claim 19 wherein said bridges are punched into said surface of said panel member so as to form a convex bridge in said upper surface of said panel member, said convex bridges being arranged in rows and columns.
21. Filter underdrain assembly for controlling backwash water flow from a backwash water inlet comprising a plurality of panel members forming a grid like underdrain, each panel member having a plurality of apertures, the number or cross-sectional area of said apertures varying between said panel members, said panel members located further away from said backwash water inlet having a lesser number or smaller cross-sectional area of said apertures relative to said panel members located closer to said backwash water inlet, said panel members being operable to substantially equalize water flow from each of said panel members of said filter underdrain assembly.
22. Filter underdrain panel member for controlling backwash water flow from underdrain blocks, said panel member having a predetermined number of apertures therein to allow passage of water therethrough, an attachment for mechanically positioning said panel member on said underdrain blocks and a sealing member to provide a substantially watertight seal between said panel member and said underdrain block.
23. Filter underdrain assembly comprising an arch extending longitudinally in said underdrain assembly from a water inlet generally located adjacent one end of said arch, said arch being positioned above said underdrain assembly and allowing water from said water inlet to enter the interior of said arch, said arch having a plurality of perforations extending the length of said arch, said plurality of perforations having larger cross-sectional area nearer said water inlet, said plurality of perforations having smaller cross-sectional area further from said water inlet.
24. Filter underdrain assembly as in claim 23 wherein said perforations are elongate slots, the number of elongate slots at said one end of said arch adjacent said water inlet being greater that the number of said elongate slots adjacent said end opposite said one end.
25. Filter underdrain assembly as in claim 24 wherein said elongate slots are punched in a plurality of plates individually removable from said arch.
26. Filter underdrain assembly as in claim 24 wherein said elongate slots are punched directly into said arch, said slots nearer said water inlet having a greater cross-sectional area that said slots further from said water inlet.
27. Filter underdrain assembly as in claim 26 wherein said elongate slots are generally horizontal.
28. Filter underdrain assembly as in claim 26 wherein said elongate slots are generally vertical.
29. Filter underdrain assembly as in claim 24 and further considering an air passageway in said arch.
30. Method of equalizing backwash water flow in a filter underdrain assembly having a water inlet and a plurality of blocks located relatively closer and relatively further from said water inlet, said plurality of blocks having an upper surface and a water passageway, holes extending between said water passageway and said upper surface, said method comprising blocking a predetermined number of said holes in a specific number of said blocks such that the quantity of water flowing from said upper surface of said blocks located relatively closer to said water inlet is substantially similar to said quantity of water flowing from said blocks located relatively further from said water inlet.
31. Method as in claim 30 and further comprising positioning panel members over said upper surface of said blocks.
32. Method as in claim 31 and further comprising apertures in said panel members.
33. Method as in claim 32 wherein said apertures are elongate slots.
34. Method as in claim 32 wherein the cross-sectional area of all said apertures in each of said panel members is substantially equal.
CA2543681A 1999-04-30 1999-04-30 Filter underdrain system for backwash flow and method for measuring same Expired - Lifetime CA2543681C (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
CA2543681A CA2543681C (en) 1999-04-30 1999-04-30 Filter underdrain system for backwash flow and method for measuring same

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CA002270811A CA2270811C (en) 1999-04-30 1999-04-30 Filter underdrain system for backwash flow and method for measuring same
CA2543681A CA2543681C (en) 1999-04-30 1999-04-30 Filter underdrain system for backwash flow and method for measuring same

Related Parent Applications (1)

Application Number Title Priority Date Filing Date
CA002270811A Division CA2270811C (en) 1999-04-30 1999-04-30 Filter underdrain system for backwash flow and method for measuring same

Publications (2)

Publication Number Publication Date
CA2543681A1 true CA2543681A1 (en) 2000-10-30
CA2543681C CA2543681C (en) 2012-11-27

Family

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Family Applications (2)

Application Number Title Priority Date Filing Date
CA2543681A Expired - Lifetime CA2543681C (en) 1999-04-30 1999-04-30 Filter underdrain system for backwash flow and method for measuring same
CA002270811A Expired - Lifetime CA2270811C (en) 1999-04-30 1999-04-30 Filter underdrain system for backwash flow and method for measuring same

Family Applications After (1)

Application Number Title Priority Date Filing Date
CA002270811A Expired - Lifetime CA2270811C (en) 1999-04-30 1999-04-30 Filter underdrain system for backwash flow and method for measuring same

Country Status (1)

Country Link
CA (2) CA2543681C (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108744686A (en) * 2018-09-10 2018-11-06 净化控股集团股份有限公司 A kind of filter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108744686A (en) * 2018-09-10 2018-11-06 净化控股集团股份有限公司 A kind of filter

Also Published As

Publication number Publication date
CA2543681C (en) 2012-11-27
CA2270811A1 (en) 2000-10-30
CA2270811C (en) 2006-07-18

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Legal Events

Date Code Title Description
EEER Examination request
FZDC Discontinued application reinstated
MKEX Expiry

Effective date: 20190430

MKEX Expiry

Effective date: 20190430