WO2002018720A1 - Creen assembly for combined sewer overflow weir - Google Patents

Creen assembly for combined sewer overflow weir Download PDF

Info

Publication number
WO2002018720A1
WO2002018720A1 PCT/GB2001/002121 GB0102121W WO0218720A1 WO 2002018720 A1 WO2002018720 A1 WO 2002018720A1 GB 0102121 W GB0102121 W GB 0102121W WO 0218720 A1 WO0218720 A1 WO 0218720A1
Authority
WO
WIPO (PCT)
Prior art keywords
screen
sweeper
assembly
foul
water
Prior art date
Application number
PCT/GB2001/002121
Other languages
French (fr)
Inventor
Barrie Christopher Woodbridge
Kevin Donald Cottam
Original Assignee
Hydro International Plc
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
Family has litigation
First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=26244929&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=WO2002018720(A1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Priority claimed from GBGB0021212.6A external-priority patent/GB0021212D0/en
Application filed by Hydro International Plc filed Critical Hydro International Plc
Priority to AU5649701A priority Critical patent/AU5649701A/en
Priority to JP2002522619A priority patent/JP4526761B2/en
Priority to KR1020037002992A priority patent/KR100834924B1/en
Priority to EP01929817A priority patent/EP1313922B1/en
Priority to US10/362,752 priority patent/US6953524B2/en
Priority to CA002420641A priority patent/CA2420641C/en
Priority to AU2001256497A priority patent/AU2001256497B2/en
Priority to DE60126292T priority patent/DE60126292T2/en
Publication of WO2002018720A1 publication Critical patent/WO2002018720A1/en

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/12—Emergency outlets
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/01—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements
    • B01D29/03—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements self-supporting
    • B01D29/035—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor with flat filtering elements self-supporting with curved filtering elements
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B01D29/6407—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element brushes
    • B01D29/6415—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element brushes with a rotary movement with respect to the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D29/00—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor
    • B01D29/62—Regenerating the filter material in the filter
    • B01D29/64—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element
    • B01D29/6469—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers
    • B01D29/6476—Regenerating the filter material in the filter by scrapers, brushes, nozzles, or the like, acting on the cake side of the filtering element scrapers with a rotary movement with respect to the filtering element
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D2201/00—Details relating to filtering apparatus
    • B01D2201/48—Overflow systems
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/12—Emergency outlets
    • E03F5/125—Emergency outlets providing screening of overflowing water

Definitions

  • the invention relates to screens for Combined Sewer Overflo w(CSO) Weirs for the screening of excess storm flows from the sewerage system to a recipient waterway, relieving hydraulic pressure on downstream sewerage and waste water treatment works (WwTW's).
  • any screen If any screen is used it must be capable of working unattended and largely unmaintained for most of its life. Some existing screens become blinded or allow matter through the screen or cannot remove captured matter from the screen and return this to the foul flow for treatment at the WwTW.
  • the present (known) CSO weir screens comprise a part-cylindrical screen to the concave side of which the foul water flow is disposed, a helical scraper is disposed on the inside such that a rotation of the scraper the helical edge sweeps the concave surface of captured matter, the convex side of the screen connecting in use with a screened water outflow to a recipient waterway, the screen being disposed such that screen is generally a U-shaped trough, the concave surface is generally disposed such that any solid matter swept from the screen remains by gravity in foul flow, initially in the bottom of the U-shaped screen, leading to blockage problems.
  • the screen assembly of the present invention separates the solid matter from the carrying storm liquid, being placed in use alongside the overflow weir to intercept/screen the excess storm flow keeping any larger matter in the foul flow and allowing liquid and smaller solid matter over the weir to pass to the recipient waterway, yet minimising blockage problems.
  • the screen assembly of the present invention comprises a screen in the shape of a cylinder a longitudinal section of which has been removed, so that the screen is in lateral section of arcuate form, the screen being disposed between separated foul water and screened water flows such that foul water is received on the concave face, water and small solids passing through the screen to the screened water flow, and large solids being retained on the foul water side, a helical sweeper being disposed on the foul water side within the cylindrical section so that on rotation of the sweeper in use any solid matter adhering to the concave surface of the screen is dislodged and kept in the foul water flow so keeping the screen clear and minimising blockage thereof, the assembly being disposed such that the convex surface of the screen is above the concave surface which faces downwardly so that water and small solids pass upwardly through the screen, the larger solids falling back from the screen in the foul stream with the assistance of gravity.
  • the screen is hemicylindrical and is thus in lateral section an 180 degree arc or thereabouts.
  • the helical screw sweeper is provided with a brush element along the sweeper edge thereof to contact the concave surface of the screen.
  • the brush is preferably nylon.
  • the screen is disposed along the edge of a weir such that screened water is carried over the weir and on to a recipient waterway.
  • the screen is preferably made from stainless steel and may be provided with a non-stick coating.
  • the screen perforation is typically 6mm or such other size as may be prescribed for the application.
  • the helical sweeper is electrically or hydraulically powered in known manner. Space at the upstream and downstream ends of the screen is to be kept clear to allow the passage of screened effluent around the screen and then over the weir.
  • the present invention may be preferably modified for such systems by providing a launder arrangement comprising a said helical sweeper having a remote end to which material is conveyed by movement of said sweeper, the remote end being enclosed by a stainless steel pipe of slightly larger diameter than the sweeper, the pipe being connected to a secondary chamber downstream into which at least some of said detritus and plastics may be conveyed by the sweeper so reducing the amount of detritus and plastics and the consequent clogging effect in the vicinity of the screen.
  • the assembly comprises a hemi-cylindrical perforated screen shown generally as 10 having perforations 12 of 6mm in its cylindrical surface and supported by two flanges 14 on frame 16 provided on walls 18 which divide the foul water flow from the screened water flow.
  • the flanges 14 are releasably secured to the abutments 16 in known manner by screws (not shown).
  • the screen 10 is made from stainless steel and is coated with a non-stick coating to discourage adherence of paper and solids thereto.
  • a helical screw 20 having along its helical edge a continuous brush 22 of nylon bristle.
  • a gap is shown between the bristles of brush 22 and the screen 10 in the drawing and this is the situation which will occur after heavy wear - the gap has been exaggerated for clarity).
  • the screen is disposed concave face down and that the foul water flow 'A' is upward through the screen 10 into the screened water channel X and thence over a weir 24 and via a conduit to a recipient waterway (not shown).
  • any solids swept from the screen 10 by sweeper 20 will fall away from the screen by gravity instead of remaining within the screen as in the prior art (where the screen is concave face up).
  • the screen need not be hemisphercial but could, in section, be greater than or less than 180 of arc. This is less advantageous since with less than 180 of arc the screen is unnecessarily narrow whereas if the arc is much more than 180 (so that the screen and its flanges are similar to the Greek letter omega) then debris falling from the top of the screen may fall on -entrant arcuate surfaces below which is less advantageous.
  • the helical screw sweeper may be replaced by a radial sweeper.

Abstract

A screen assembly in which the screen (10) is in the form of an inverted semi-circular trough the foul flow (A) to be screened approaching the underside of the screen so that debris which is filtered falls away from the screen by gravity so minimising blockages and 'blinding' of the screen. A helical sweeper (20) is provided to minimise adherence to the screen.

Description

Screen Assembly for Combined Sewer Overflow Weir.
The invention relates to screens for Combined Sewer Overflo w(CSO) Weirs for the screening of excess storm flows from the sewerage system to a recipient waterway, relieving hydraulic pressure on downstream sewerage and waste water treatment works (WwTW's).
European legislation and aesthetic concerns demand that matter greater than 6mm is not passed over the weir to hang on the river bank.
If any screen is used it must be capable of working unattended and largely unmaintained for most of its life. Some existing screens become blinded or allow matter through the screen or cannot remove captured matter from the screen and return this to the foul flow for treatment at the WwTW.
The present (known) CSO weir screens comprise a part-cylindrical screen to the concave side of which the foul water flow is disposed, a helical scraper is disposed on the inside such that a rotation of the scraper the helical edge sweeps the concave surface of captured matter, the convex side of the screen connecting in use with a screened water outflow to a recipient waterway, the screen being disposed such that screen is generally a U-shaped trough, the concave surface is generally disposed such that any solid matter swept from the screen remains by gravity in foul flow, initially in the bottom of the U-shaped screen, leading to blockage problems.
The screen assembly of the present invention separates the solid matter from the carrying storm liquid, being placed in use alongside the overflow weir to intercept/screen the excess storm flow keeping any larger matter in the foul flow and allowing liquid and smaller solid matter over the weir to pass to the recipient waterway, yet minimising blockage problems.
The screen assembly of the present invention comprises a screen in the shape of a cylinder a longitudinal section of which has been removed, so that the screen is in lateral section of arcuate form, the screen being disposed between separated foul water and screened water flows such that foul water is received on the concave face, water and small solids passing through the screen to the screened water flow, and large solids being retained on the foul water side, a helical sweeper being disposed on the foul water side within the cylindrical section so that on rotation of the sweeper in use any solid matter adhering to the concave surface of the screen is dislodged and kept in the foul water flow so keeping the screen clear and minimising blockage thereof, the assembly being disposed such that the convex surface of the screen is above the concave surface which faces downwardly so that water and small solids pass upwardly through the screen, the larger solids falling back from the screen in the foul stream with the assistance of gravity.
Preferably the screen is hemicylindrical and is thus in lateral section an 180 degree arc or thereabouts.
Preferably the helical screw sweeper is provided with a brush element along the sweeper edge thereof to contact the concave surface of the screen. The brush is preferably nylon.
The screen is disposed along the edge of a weir such that screened water is carried over the weir and on to a recipient waterway. The screen is preferably made from stainless steel and may be provided with a non-stick coating. The screen perforation is typically 6mm or such other size as may be prescribed for the application.
The helical sweeper is electrically or hydraulically powered in known manner. Space at the upstream and downstream ends of the screen is to be kept clear to allow the passage of screened effluent around the screen and then over the weir.
In sewerage systems which are susceptible to deposition of large amounts of detritus and plastics, an accumulation of floating matter can occur in the screen chamber after a dry period followed by a storm.
It is well known in the art to provide, in these circumstances, a launder arrangement to transfer debris from the screen chamber to another separate chamber or region.
The present invention may be preferably modified for such systems by providing a launder arrangement comprising a said helical sweeper having a remote end to which material is conveyed by movement of said sweeper, the remote end being enclosed by a stainless steel pipe of slightly larger diameter than the sweeper, the pipe being connected to a secondary chamber downstream into which at least some of said detritus and plastics may be conveyed by the sweeper so reducing the amount of detritus and plastics and the consequent clogging effect in the vicinity of the screen.
An Embodiment of the invention will now be described by way of a example only and with reference to the accompanying drawing the single figure of which is a schematic lateral cross sectional view of an assembly according to the invention. The assembly comprises a hemi-cylindrical perforated screen shown generally as 10 having perforations 12 of 6mm in its cylindrical surface and supported by two flanges 14 on frame 16 provided on walls 18 which divide the foul water flow from the screened water flow. The flanges 14 are releasably secured to the abutments 16 in known manner by screws (not shown). The screen 10 is made from stainless steel and is coated with a non-stick coating to discourage adherence of paper and solids thereto.
Within the cylindrical screen is mounted, on the axis of the cylinder, a helical screw 20 having along its helical edge a continuous brush 22 of nylon bristle. (A gap is shown between the bristles of brush 22 and the screen 10 in the drawing and this is the situation which will occur after heavy wear - the gap has been exaggerated for clarity). It will be noted that the screen is disposed concave face down and that the foul water flow 'A' is upward through the screen 10 into the screened water channel X and thence over a weir 24 and via a conduit to a recipient waterway (not shown).
Because the screen is disposed concave face down, any solids swept from the screen 10 by sweeper 20 will fall away from the screen by gravity instead of remaining within the screen as in the prior art (where the screen is concave face up).
Various modifications may be made without departing from the scope of the invention as defined in the appended claims. For example the screen need not be hemisphercial but could, in section, be greater than or less than 180 of arc. This is less advantageous since with less than 180 of arc the screen is unnecessarily narrow whereas if the arc is much more than 180 (so that the screen and its flanges are similar to the Greek letter omega) then debris falling from the top of the screen may fall on -entrant arcuate surfaces below which is less advantageous.
The helical screw sweeper may be replaced by a radial sweeper.

Claims

1. A screen assembly comprising a screen in the shape of a cylinder a longitudinal section of which has been removed, so that the screen is in lateral section of arcuate form, the screen being disposed between separated foul water and screened water flows such that foul water is received on the concave face, water and small solids passing through the screen to the screened water flow, and large solids being retained on the foul water side, a helical sweeper being disposed on the foul water side within the cylindrical section so that on rotation of the sweeper in use any solid matter adhering to the concave surface of the screen is dislodged and kept in the foul water flow so keeping the screen clear and minimising blockage thereof, the assembly being disposed such that the convex surface of the screen is above the concave surface which faces downwardly so that water and small solids pass upwardly through the screen, the larger solids falling back from the screen in the foul stream with the assistance of gravity.
2. A screen assembly as claimed in claim 1 in which the screen is hemicylindrical and is thus in lateral section an 180 degree arc or thereabouts.
3. A screen assembly as claimed in claim 1 or claim 2 in which the helical screw sweeper is provided with a brush element along the sweeper edge thereof to contact the concave surface of the screen.
4. A screen assembly as claimed in any preceding claim in which the screen is made from stainless steel and provided with a non-stick coating.
5. A screen assembly as claimed in any preceding claim in which there is provided a launder arrangement comprising said sweeper having a remote end to which material is conveyed by movement of said sweeper, the remote end being enclosed by a stainless steel pipe of slightly larger diameter than the sweeper, the pipe being connected to a secondary chamber downstream into which at least some of said detritus and plastics may be conveyed by the sweeper, so reducing the amount of detritus and plastics and the consequent clogging effect in the vicinity of the screen.
PCT/GB2001/002121 2000-08-29 2001-05-14 Creen assembly for combined sewer overflow weir WO2002018720A1 (en)

Priority Applications (8)

Application Number Priority Date Filing Date Title
AU5649701A AU5649701A (en) 2000-08-29 2001-05-14 Screen assembly for combined sewer overflow weir
JP2002522619A JP4526761B2 (en) 2000-08-29 2001-05-14 Sieve assembly for combined sewage weirs
KR1020037002992A KR100834924B1 (en) 2000-08-29 2001-05-14 Screen Assembly for Combined Sewer Overflow Weir
EP01929817A EP1313922B1 (en) 2000-08-29 2001-05-14 Screen assembly for combined sewer overflow weir
US10/362,752 US6953524B2 (en) 2000-08-29 2001-05-14 Screen assembly for combined sewer overflow weir
CA002420641A CA2420641C (en) 2000-08-29 2001-05-14 Screen assembly for combined sewer overflow weir
AU2001256497A AU2001256497B2 (en) 2000-08-29 2001-05-14 Screen assembly for combined sewer overflow weir
DE60126292T DE60126292T2 (en) 2000-08-29 2001-05-14 SIEVE ARRANGEMENT FOR AN OVERFLOW FOR A DIRT WATER CHANNEL

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
GBGB0021212.6A GB0021212D0 (en) 2000-08-29 2000-08-29 Screen assembly for combined sewer overflow weir
GB0021212.6 2000-08-29
GB0029742.4 2000-12-06
GB0029742A GB2356157B (en) 2000-08-29 2000-12-06 Screen assembly for combined sewer overflow weir

Publications (1)

Publication Number Publication Date
WO2002018720A1 true WO2002018720A1 (en) 2002-03-07

Family

ID=26244929

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/GB2001/002121 WO2002018720A1 (en) 2000-08-29 2001-05-14 Creen assembly for combined sewer overflow weir

Country Status (8)

Country Link
US (1) US6953524B2 (en)
EP (1) EP1313922B1 (en)
JP (1) JP4526761B2 (en)
AT (1) ATE352678T1 (en)
AU (2) AU5649701A (en)
CA (1) CA2420641C (en)
DE (1) DE60126292T2 (en)
WO (1) WO2002018720A1 (en)

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CN113480021A (en) * 2021-04-30 2021-10-08 内蒙古兴田水环境科学技术研究院 Double overflow weir device for sewage treatment

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US20080308477A1 (en) * 2004-11-03 2008-12-18 John Hurst Cascading storm drain filter
US7438802B2 (en) 2004-11-03 2008-10-21 Hurst John G Run-off water filter for storm drains
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JP4395190B2 (en) * 2008-02-19 2010-01-06 株式会社ハネックス Separation apparatus and separation method
EP2116649A3 (en) * 2008-05-05 2011-07-13 Jörg-Michael Dipl.-Ing. Steinhardt Screening device with a device to remove the items being screened
US8017006B2 (en) * 2009-04-10 2011-09-13 Eudoro Lopez Storm water filtration apparatus
CN101824853A (en) * 2010-05-10 2010-09-08 宣伯民 Downspout strainer without forming scales and accumulating sewage
US8297448B2 (en) 2010-11-22 2012-10-30 Johnson Screens, Inc. Screen intake device for shallow water
CN103867496B (en) * 2014-04-03 2015-12-09 唐花女 The liquid with ball thrust bearing and sliding conical bearing provides device
CN103982424B (en) * 2014-05-21 2015-12-02 唐花女 There is the water plug of hierarchy Stamping Steel Ribbon and band electroplated coating central shaft
KR101959509B1 (en) * 2018-07-26 2019-03-18 (주)랜드로드 Storm water drainage pollutant filtration devices and monitoring system
CA3077753A1 (en) * 2019-04-12 2020-10-12 Cameron Farms Hutterite Colony Fluid pumping apparatus and methods of use
CN111450588A (en) * 2020-04-27 2020-07-28 中山市恒雅环保工程有限公司 Industrial production waste water treatment equipment
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Also Published As

Publication number Publication date
EP1313922B1 (en) 2007-01-24
US20040028474A1 (en) 2004-02-12
JP2004513264A (en) 2004-04-30
DE60126292D1 (en) 2007-03-15
AU2001256497B2 (en) 2006-01-05
AU5649701A (en) 2002-03-13
US6953524B2 (en) 2005-10-11
CA2420641C (en) 2008-11-18
EP1313922A1 (en) 2003-05-28
CA2420641A1 (en) 2002-03-07
DE60126292T2 (en) 2007-05-31
JP4526761B2 (en) 2010-08-18
ATE352678T1 (en) 2007-02-15

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