WO1999049145A1 - Raked bar screen - Google Patents
Raked bar screen Download PDFInfo
- Publication number
- WO1999049145A1 WO1999049145A1 PCT/GB1999/000847 GB9900847W WO9949145A1 WO 1999049145 A1 WO1999049145 A1 WO 1999049145A1 GB 9900847 W GB9900847 W GB 9900847W WO 9949145 A1 WO9949145 A1 WO 9949145A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- grid
- bars
- bar screen
- overflow
- conduit
- Prior art date
Links
- 239000007787 solid Substances 0.000 claims abstract description 21
- 238000010408 sweeping Methods 0.000 claims abstract description 3
- 239000010865 sewage Substances 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 9
- 238000009434 installation Methods 0.000 claims description 5
- 239000011343 solid material Substances 0.000 description 2
- 239000002351 wastewater Substances 0.000 description 2
- 244000126211 Hericium coralloides Species 0.000 description 1
- 238000003491 array Methods 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 239000012530 fluid Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 230000025508 response to water Effects 0.000 description 1
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
-
- 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
- B01D29/44—Edge filtering elements, i.e. using contiguous impervious surfaces
- B01D29/445—Bar screens
-
- 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
- B01D29/60—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration
- B01D29/605—Filters with filtering elements stationary during filtration, e.g. pressure or suction filters, not covered by groups B01D24/00 - B01D27/00; Filtering elements therefor integrally combined with devices for controlling the filtration by level measuring
-
- 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
- B01D29/6484—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 translatory 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
- B01D2201/28—Position of the filtering element
- B01D2201/282—Filtering elements with a horizontal rotation or symmetry axis
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2201/00—Details relating to filtering apparatus
- B01D2201/28—Position of the filtering element
- B01D2201/287—Filtering elements with a vertical or inclined rotation or symmetry axis
-
- 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
- This invention relates to a raked bar screen for a storm overflow.
- Typical sewage systems are designed to accommodate not only normal flows of waste water but also flows of storm water resulting from heavy rainfall, flooding and the like.
- a storm water overflow is positioned alongside a sewage pipe, the arrangement being known as a combined sewer overflow or CSO.
- CSO combined sewer overflow
- the level of water in the pipe rises and flows up through a horizontal bar screen and out over a weir for discharge into a receiving watercourse.
- the bar screen is arranged vertically.
- the purpose of the bar screen is to filter out floating solid matter from the waste water and retain it in the sewage pipe, so that the receiving watercourse does not become polluted.
- comb-like devices have been designed to continuously sweep the longitudinal spaces between individual bars of the bar screen during storm conditions.
- DE-A-4 215 002 discloses a raked bar screen for a storm overflow.
- the screen comprises a grid of parallel spaced-apart bars attached at their ends to a framework.
- a comb assembly is provided with teeth which engage in the spaces between the grid bars.
- the comb assembly is pivoted about a central point above the grid and is caused to swing to and fro by a drive unit.
- the comb teeth accordingly sweep longitudinally back and forth between the grid bars. While this system satisfactorily keeps the central part of the grid free from solid blockage, it tends to sweep solid matter to each longitudinal end of the grid. As this solid matter builds up at each end, the amplitude of swing of the comb assembly is reduced. Not only is the effectiveness of filtration of the screen reduced, but mechanical stresses build up in the linkage with the drive unit, and can lead to breakdown.
- GB-A-2 310 382 discloses a sewage screen having at least one pocket extending downstream of at least some portions of the screen, in relation to an intended direction of flow, to accommodate inorganic debris. Portions of the screen may slant upwardly at the ends. However, the screen is arranged in an upwardly extending overflow shaft, so solid material tends to accumulate in the pockets rather than being swept along in the flow of the sewage conduit.
- the present invention provides a solution to the foregoing problems.
- a raked bar screen for a combined sewer conduit and storm water overflow conduit comprising a grid of parallel spaced-apart bars attached at their ends to a framework; a comb assembly having teeth adapted to engage in the spaces between the grid bars, the comb assembly being longitudinally reciprocable, whereby the comb teeth can sweep longitudinally back and forth between the grid bars from end to end; the grid bars being straight with open-ended spaces therebetween and defining a first surface of the grid on the sewer side and a second surface of the grid on the overflow side, whereby in use sweeping of the comb teeth along and beyond the open ends of the spaces between the grid bars will drive out entrapped solid matter; the framework including solid cap portions joined to the respective ends of the bars and extending transversely thereto, and each having a flat surface which abuts and is colinear with the said second surface of the grid; and the comb teeth each having leading and trailing edges, a flat proximal edge and a distal edge, the flat
- the grid may be arranged horizontally or vertically or at an intermediate angle, e.g. an angle with the vertical of 45° or less.
- the distal edges of the comb teeth preferably protrude through the first surface of the grid, i.e. towards the sewer.
- the solid cap portion which supports the ends of the grid bars preferably incorporates a knife edge adjoining the second surface of the grid so as to scrape adhered solid matter off the flat proximal edge of the comb teeth at their extremity of travel.
- the raked bar screen preferably comprises two or more banks of grid bars in tandem, each being separated from the next by a solid cap portion, and each being longitudinally swept from end to end by a respective comb assembly.
- the invention also provides a combined sewer overflow installation, comprising a sewage conduit, and a storm overflow conduit adjacent to at least part of the sewage conduit, wherein part of the sewage conduit is in communication with part of the storm overflow conduit via an overflow weir, and wherein a raked bar screen as defined above is arranged on the overflow weir or above the part of the sewage conduit which is in communication with the storm overflow conduit.
- Figure 1 is a plan view of a raked bar screen according to a preferred embodiment of the invention, the grid bars not being individually shown for clarity;
- Figure 2 is a side view in the form of a section on the line B-B of Figure 1 ;
- Figure 3 is an end view in the form of a section on the line A-A of Figure 1 , in which the screen is shown installed vertically on a weir wall, and the grid bars and comb teeth are not individually shown;
- Figure 4 is a detailed side view of part of the apparatus at full travel of the comb assembly
- Figure 5 is a plan view of a combined sewer overflow installation showing the screen installed horizontally;
- Figure 6 is a transverse section on the line A-A of Figure 5;
- Figure 7 is a plan view of a combined sewer overflow installation showing the screen installed vertically.
- Figure 8 is a transverse section on the line A-A of Figure 7.
- the drawings show a double raked bar screen in which two grids formed by sets of grid bars are arranged end-to-end. This forms a single module, which can be joined with other modules if needed.
- the invention is, however, equally applicable to single grid bar systems and multiple grid bar systems.
- two grids are each formed by an assembly of parallel spaced- apart grid bars 1 attached at their ends to a framework.
- the grid is arranged above a sewage conduit (as shown in Figures 5 to 8) so that, in storm conditions, as the water level rises the overflow of water is filtered by the grid.
- the framework comprises longitudinal lateral supports 2 and end supports 3.
- the grid bars 1 define a first surface 11 of the grid on the sewer side and a second surface 12 of the grid on the overflow side.
- a comb assembly comprises two transverse support bars 4, on one side of the grids, and each supporting a line of attached comb teeth 5 of plastics material.
- the teeth 5 are mounted on the transverse support bar 4 in a spacing which corresponds to the spacing of the grid bars 1, and the teeth 5 engage respectively in the longitudinal spaces between successive grid bars 1.
- the teeth each have a flat proximal edge 15 which is colinear with the overflow side surface 12 of the grid, and a distal edge which protrudes slightly through the sewer side surface 11 of the grid.
- the transverse support bars 4 are linked by two longitudinal support bars 6.
- the transverse support bars 4 terminate in bearing blocks 4 A which slide along and are supported by longitudinal guide bars 10.
- the two transverse support bars 4 cooperate respectively with the two sets of grid bars 1 , so that the two sets of comb teeth 5 sweep the longitudinal spaces in the two arrays of grid bars 1, respectively. This is achieved by longitudinal reciprocation of the comb assembly.
- One of the transverse support bars 4 is joined by a linkage 7 to a hydraulic cylinder 8, mounted on a longitudinal support bar 9, mounted between the respective end members 3 of the supporting framework.
- the hydraulic cylinder 8 is driven in reciprocating fashion on the support bar 9 by a supply of hydraulic fluid (not shown).
- the cylinder 8 in turn drives the comb assembly.
- the system is switched on and off in response to water level sensors.
- the grid bars 1 are straight and have open-ended spaces (not shown) therebetween.
- the grid bars define a first surface 11 of the grid on the sewer side and a second surface 12 of the grid on the overflow side.
- the leading edge 13 of each comb tooth passes completely through and beyond the open end of the respective space between the grid bars. This ensures that solid matter entrapped between the grid bars is completely swept out by the comb teeth.
- each set of grid bars is joined to a transversely extending solid cap 14, which terminates in a knife edge 14A ( Figure 4) adjacent the second surface 12 of the grid, with the tip of the knife edge directed towards the central portion.
- the knife edge 14A is arranged to overlap with part of a flat proximal surface 15 of the comb teeth 5.
- the flat proximal surface 15 of the comb teeth contacts and slides at least partly along a flat surface 14B of the solid cap 14, which abuts and is colinear with the second surface 12 of the grid.
- the grid bars are at the same level as or only slightly above the top of the weir ( Figures 6 and 8), solid material swept from between the bars by the comb teeth is immediately carried along by the flow of water in the sewage pipe.
- Figures 5 and 6 show a sewage pipe 20 and storm overflow pipe 21 in a region where they communicate with each other.
- a weir 22 is arranged between them.
- Overflow water is constrained to pass through a horizontally arranged raked bar screen (as described above).
- the raked bar screen is positioned over the sewer at the level of the weir 22.
- the grid bars are at the same level as the top of the weir 22.
- FIGs 7 and 8 conespond to Figures 5 and 6, except that the screen is ananged vertically on top of the weir.
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Engineering & Computer Science (AREA)
- Hydrology & Water Resources (AREA)
- Public Health (AREA)
- Water Supply & Treatment (AREA)
- Sewage (AREA)
Abstract
Description
Claims
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU29470/99A AU2947099A (en) | 1998-03-20 | 1999-03-18 | Raked bar screen |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9806071.8 | 1998-03-20 | ||
GBGB9806071.8A GB9806071D0 (en) | 1998-03-20 | 1998-03-20 | Raked bar screen |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999049145A1 true WO1999049145A1 (en) | 1999-09-30 |
Family
ID=10829003
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1999/000847 WO1999049145A1 (en) | 1998-03-20 | 1999-03-18 | Raked bar screen |
Country Status (3)
Country | Link |
---|---|
AU (1) | AU2947099A (en) |
GB (1) | GB9806071D0 (en) |
WO (1) | WO1999049145A1 (en) |
Cited By (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001030481A1 (en) * | 1999-10-22 | 2001-05-03 | Jones & Attwood Limited | Screening apparatus for use in a sewerage system and method of screening an excess flow in a sewerage system |
GB2403438A (en) * | 2003-03-06 | 2005-01-05 | Three Star Enviromental Ltd | Screening apparatus |
EP2116650A2 (en) | 2008-05-05 | 2009-11-11 | Jörg-Michael Dipl.-Ing. Steinhardt | Screening device with a device for removing the items being screened |
CN110215750A (en) * | 2019-06-13 | 2019-09-10 | 杭州绿一环保技术有限公司 | A kind of sewage rubbish processing equipment |
Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4215002A1 (en) | 1991-06-03 | 1992-12-10 | Werner Nill | Grid and combing arrangement for rain water collection chamber - has comb swung to=and=fro through grid by motor to clear grid of obstructions |
WO1994007585A1 (en) * | 1992-09-25 | 1994-04-14 | Romag Röhren und Maschinen AG | Sewage water installation with an incorporated screening unit |
WO1995019471A1 (en) * | 1994-01-13 | 1995-07-20 | Va Teknik I Borås Ab | Method and apparatus for sewage treatment |
DE19515924A1 (en) * | 1995-05-02 | 1995-10-05 | Umwelttechnik & Anlagenbau Gmb | Filter unit to retain solids in waste water flow appts. |
GB2310382A (en) | 1996-02-23 | 1997-08-27 | Apoc Limited | A sewage screen |
-
1998
- 1998-03-20 GB GBGB9806071.8A patent/GB9806071D0/en not_active Ceased
-
1999
- 1999-03-18 WO PCT/GB1999/000847 patent/WO1999049145A1/en active Application Filing
- 1999-03-18 AU AU29470/99A patent/AU2947099A/en not_active Abandoned
Patent Citations (5)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE4215002A1 (en) | 1991-06-03 | 1992-12-10 | Werner Nill | Grid and combing arrangement for rain water collection chamber - has comb swung to=and=fro through grid by motor to clear grid of obstructions |
WO1994007585A1 (en) * | 1992-09-25 | 1994-04-14 | Romag Röhren und Maschinen AG | Sewage water installation with an incorporated screening unit |
WO1995019471A1 (en) * | 1994-01-13 | 1995-07-20 | Va Teknik I Borås Ab | Method and apparatus for sewage treatment |
DE19515924A1 (en) * | 1995-05-02 | 1995-10-05 | Umwelttechnik & Anlagenbau Gmb | Filter unit to retain solids in waste water flow appts. |
GB2310382A (en) | 1996-02-23 | 1997-08-27 | Apoc Limited | A sewage screen |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001030481A1 (en) * | 1999-10-22 | 2001-05-03 | Jones & Attwood Limited | Screening apparatus for use in a sewerage system and method of screening an excess flow in a sewerage system |
GB2403438A (en) * | 2003-03-06 | 2005-01-05 | Three Star Enviromental Ltd | Screening apparatus |
GB2403438B (en) * | 2003-03-06 | 2005-07-27 | Three Star Enviromental Ltd | Screening apparatus |
US7364652B2 (en) | 2003-03-06 | 2008-04-29 | Three Star Environmental Ltd. | Screening apparatus |
EP2116650A2 (en) | 2008-05-05 | 2009-11-11 | Jörg-Michael Dipl.-Ing. Steinhardt | Screening device with a device for removing the items being screened |
EP2116649A2 (en) | 2008-05-05 | 2009-11-11 | Jörg-Michael Dipl.-Ing. Steinhardt | Screening device with a device to remove the items being screened |
EP2116651A2 (en) | 2008-05-05 | 2009-11-11 | Jörg-Michael Dipl.-Ing. Steinhardt | Screening device with a device for removing the items being screened |
EP2116651A3 (en) * | 2008-05-05 | 2011-07-06 | Jörg-Michael Dipl.-Ing. Steinhardt | Screening device with a device for removing the items being screened |
EP2116650A3 (en) * | 2008-05-05 | 2011-07-06 | Jörg-Michael Dipl.-Ing. Steinhardt | Screening device with a device for removing the items being screened |
US8021544B2 (en) | 2008-05-05 | 2011-09-20 | Steinhardt Joerg-Michael | Wastewater screening device |
US8029665B2 (en) | 2008-05-05 | 2011-10-04 | Steinhardt Joerg-Michael | Wastewater screening device |
US8029666B2 (en) | 2008-05-05 | 2011-10-04 | Steinhardt Joerg-Michael | Wastewater screening device |
CN110215750A (en) * | 2019-06-13 | 2019-09-10 | 杭州绿一环保技术有限公司 | A kind of sewage rubbish processing equipment |
Also Published As
Publication number | Publication date |
---|---|
AU2947099A (en) | 1999-10-18 |
GB9806071D0 (en) | 1998-05-20 |
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