GB2357446A - Filters - Google Patents

Filters

Info

Publication number
GB2357446A
GB2357446A GB0106053A GB0106053A GB2357446A GB 2357446 A GB2357446 A GB 2357446A GB 0106053 A GB0106053 A GB 0106053A GB 0106053 A GB0106053 A GB 0106053A GB 2357446 A GB2357446 A GB 2357446A
Authority
GB
United Kingdom
Prior art keywords
filter
slots
tubes
tube
width
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
GB0106053A
Other versions
GB2357446B (en
GB0106053D0 (en
Inventor
David Gordon Stevenson
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.)
Thames Water Utilities Ltd
Original Assignee
Thames Water Utilities Ltd
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 Thames Water Utilities Ltd filed Critical Thames Water Utilities Ltd
Publication of GB0106053D0 publication Critical patent/GB0106053D0/en
Publication of GB2357446A publication Critical patent/GB2357446A/en
Application granted granted Critical
Publication of GB2357446B publication Critical patent/GB2357446B/en
Anticipated expiration legal-status Critical
Expired - Fee Related legal-status Critical Current

Links

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
    • B01D24/02—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

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Filtration Of Liquid (AREA)
  • Filtering Materials (AREA)

Abstract

The invention relates to a filter (1) which has a backwashing system (2) comprising a plurality of members in the form of slotted stainless steel pipes or tubes, or "laterals", (3) extending laterally of the filter below the filter medium, sand in the embodiment, each tube being substantially parallel and each being connected in the embodiment to a manifold or air supply pipe (5) by a respective supply means or downpipe (6). Each tube (3) has a plurality of longitudinally extending slots (7), through the circumference of the tubes, the slots being in the embodiment 0.25 mm in width and being arranged in groups of three at different "levels", the two "upper" (7', 7") ones as viewed and as in use being angularly spaced by 120{, and the lower one (7"') being in use on the floor of the filter. The slots are preferably formed by a laser cutting device to provide uniformity of width and length, and with little or no swarf.
GB0106053A 1998-09-22 1999-06-23 Filters Expired - Fee Related GB2357446B (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GBGB9820624.6A GB9820624D0 (en) 1998-09-22 1998-09-22 Filters
PCT/GB1999/001958 WO2000016874A1 (en) 1998-09-22 1999-06-23 Filters

Publications (3)

Publication Number Publication Date
GB0106053D0 GB0106053D0 (en) 2001-05-02
GB2357446A true GB2357446A (en) 2001-06-27
GB2357446B GB2357446B (en) 2002-05-29

Family

ID=10839268

Family Applications (2)

Application Number Title Priority Date Filing Date
GBGB9820624.6A Ceased GB9820624D0 (en) 1998-09-22 1998-09-22 Filters
GB0106053A Expired - Fee Related GB2357446B (en) 1998-09-22 1999-06-23 Filters

Family Applications Before (1)

Application Number Title Priority Date Filing Date
GBGB9820624.6A Ceased GB9820624D0 (en) 1998-09-22 1998-09-22 Filters

Country Status (4)

Country Link
JP (1) JP2003517366A (en)
AU (1) AU4519999A (en)
GB (2) GB9820624D0 (en)
WO (1) WO2000016874A1 (en)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2796306B1 (en) * 1999-07-13 2002-07-26 Roumen Kaltchev DISSOLVED AIR CLARIFIER WITH INCORPORATED FILTER
RU2728273C1 (en) * 2019-12-24 2020-07-28 Валерий Иванович Чернышов Method of making filter element and filter element

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE696400C (en) * 1936-07-30 1940-09-20 Otto Joch Backwashable liquid filter
DE2534430A1 (en) * 1975-08-01 1977-02-10 Lederle Gmbh Wasserversorgung Water treatment filter bed - esp. for decarbonation of water supplies
DE2600897A1 (en) * 1976-01-12 1977-07-21 August Goettker Bohrgesellscha Well filter with slotted pipe - using laser beams to cut wedge shaped slots

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE696400C (en) * 1936-07-30 1940-09-20 Otto Joch Backwashable liquid filter
DE2534430A1 (en) * 1975-08-01 1977-02-10 Lederle Gmbh Wasserversorgung Water treatment filter bed - esp. for decarbonation of water supplies
DE2600897A1 (en) * 1976-01-12 1977-07-21 August Goettker Bohrgesellscha Well filter with slotted pipe - using laser beams to cut wedge shaped slots

Also Published As

Publication number Publication date
GB2357446B (en) 2002-05-29
GB9820624D0 (en) 1998-11-18
AU4519999A (en) 2000-04-10
JP2003517366A (en) 2003-05-27
GB0106053D0 (en) 2001-05-02
WO2000016874A1 (en) 2000-03-30

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Legal Events

Date Code Title Description
PCNP Patent ceased through non-payment of renewal fee

Effective date: 20070623