EP2078120A1 - Séparateur de solides utilisé dans des flux d'écoulement liquides, typiquement des déversoirs d'égouts - Google Patents

Séparateur de solides utilisé dans des flux d'écoulement liquides, typiquement des déversoirs d'égouts

Info

Publication number
EP2078120A1
EP2078120A1 EP07815453A EP07815453A EP2078120A1 EP 2078120 A1 EP2078120 A1 EP 2078120A1 EP 07815453 A EP07815453 A EP 07815453A EP 07815453 A EP07815453 A EP 07815453A EP 2078120 A1 EP2078120 A1 EP 2078120A1
Authority
EP
European Patent Office
Prior art keywords
solids
chamber
liquid
solids separator
separator according
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.)
Withdrawn
Application number
EP07815453A
Other languages
German (de)
English (en)
Other versions
EP2078120A4 (fr
Inventor
Donald Ian Phillips
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.)
Water Solutions Australia Pty Ltd
Original Assignee
Water Solutions Australia Pty 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
Priority claimed from AU2006906091A external-priority patent/AU2006906091A0/en
Application filed by Water Solutions Australia Pty Ltd filed Critical Water Solutions Australia Pty Ltd
Publication of EP2078120A1 publication Critical patent/EP2078120A1/fr
Publication of EP2078120A4 publication Critical patent/EP2078120A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/14—Devices for separating liquid or solid substances from sewage, e.g. sand or sludge traps, rakes or grates
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D21/00—Separation of suspended solid particles from liquids by sedimentation
    • B01D21/0012—Settling tanks making use of filters, e.g. by floating layers of particulate material
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/12—Emergency outlets
    • 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

  • Solids separator used in liquid flow streams typically sewer overflows
  • the present invention relates to improvements in solids/liquid separators such as those used in separating floating bodies from a liquid in sewer overflows.
  • a solids separator for use in a combined sewer overflow chamber having an inlet, a flow chamber and a main outlet whereby liquid, having solids entrained therein, flows from the inlet through the flow chamber and to the outlet, the solids separator comprising: an overflow weir over which liquid flows during large flows into a separation chamber; a filter in the separation chamber that filters solids and allows liquid to pass through to an overflow outlet; a return system containing a one-way valve, whereby the return system flushes filtered solids back to the flow chamber; and a damper spaced from the overflow weir for dampening turbulent flow entering the separation chamber from the flow chamber.
  • the damper is preferably a baffle wall located in the flow chamber and spaced from the weir.
  • the baffle wall hangs downwardly from a ceiling of the flow chamber and is located higher than the weir but with the bottom of the baffle wall located lower than the top of the weir.
  • the baffle wall is spaced from the weir at a distance equal to or less than the size of a return outlet in the return system so as to prevent solids that could become stuck in the return system from entering the separation chamber.
  • the filter is preferably a curved screen wall that convexly curves outward from the top of the weir down towards the return system and terminates at a floor of a trough in the return system.
  • the holding means is preferably an open trough having walls and a floor that is inclined towards a return outlet at which is located the one-way valve.
  • the holding trough preferably has one low wall for allowing filtered liquid to overflow the trough to the overflow outlet and extends the width of the filter, wherein the filter is a convex screen wall.
  • the filter extends from a top of the weir down into the trough such that the trough holds both solids as well as filtered liquid.
  • the trough which is to contain the filtered liquid, is also preferably segmented along its length.
  • the valve is preferably a floating ball valve captured in a valve chamber.
  • the chamber has a ceiling that is inclined upwards towards the return outlet located at an apex of the ceiling.
  • a pointed stop on the floor of the valve chamber directs the ball sideways of the stop to one side of the chamber as the ball lowers, thereby avoiding the ball from obstructing a central opening of the return conduit.
  • Figures Ia to Ie are a sequence of side sectional views of a solids separator according to a first embodiment of the invention and illustrating an overflow mode of operation of the separator, where Figures Ia, Ib, Id and Ie are taken at section A-A of Figure 2 and Figure Ic is taken at section B-B of Figure 2 that is downstream of section A-A;
  • Figure 2 is a plan view of the solids separator taken at section C-C of Figure Ib;
  • Figure 3 is a sectional side view of a valve chamber of the solids separator;
  • Figure 4 is a sectional plan view of the valve chamber of the solids separator
  • Figure 5 illustrates the solids separator of Figures Ia to Ic in a bypass mode of operation
  • Figure 6 is a cross-section of a solids separator according to a second embodiment illustrating a method of increasing the flush-water volume
  • Figures 7a and 7b are side elevations of perforation designs to demonstrate methods of preventing sewer solids from catching on the inclined perforations.
  • Figure 8 is a longitudinal section of the separator to illustrate an alternative means of storing the increased flush-water volume.
  • FIG. 1 illustrates two similar versions of a solids separator 10 designed to remove sewage bodies, such as solids, paper, sanitary materials, litter and other visible matter from sewer system overflows. While the solids separator is discussed in terms of sewer systems, it is understood that the separator could be used to separate matter from liquid generally.
  • the solids separator is adapted to manage and redirect liquid overflow from the sewerage line to a water body, such as a river, the sea, etc., while separating solids from the redirected overflow.
  • the solids separator can be made in various forms depending on requirements for installation.
  • the solids separator may be — S —
  • the solids separator may be constructed as a module for installation alongside a combined sewer overflow chamber.
  • the solids separator may be constructed as a complete unit installed in the sewer line and in addition to the solids separator features includes a main chamber through which sewer and liquid ordinarily flow from an inlet to an outlet without overflowing.
  • the solids separator is typically formed from reinforced concrete and stainless steel.
  • the solids separator is illustrated as ⁇ 10' and includes generally the features described herein which, unless specified, apply to all installation forms of the solids separator described above.
  • inlet and outlet conduits 11, 12 communicate with a main flow chamber 14 containing the liquid source for the separator 10.
  • the inlet conduit 11 and outlet conduit 12 are typically in service or may alternatively form part of a larger unit containing the solids separator 10 and a sewer flow service.
  • the components of separator 10 are retrofitted inside an existing combined sewer overflow chamber which includes an inlet opening 15 for inlet conduit 11 and an outlet opening 16 for outlet conduit 12.
  • the level of liquid 18 flowing through main chamber 14 is low and flows unobstructed through outlet opening 16 and conduit 12 towards a treatment area.
  • the second mode of operation is the overflow mode and occurs when the liquid level 18 in main chamber 14 begins to rise. In this mode overflowing water is redirected from the sewage flow in the main chamber 14 through to a water body.
  • Figure Ib illustrates liquid level 18 rising but still at a level less than the top of a weir 20 separating the main chamber 14 from a separation chamber 21.
  • a one-way valve 22 of a solids return system closes by way of liquid flowing from main chamber 14 through a return conduit 25 and into a valve chamber 23 of the one-way valve 22 where a ball valve 24 floats upwardly and closes a return outlet 26 leading to the separation chamber 21. This prevents short-circuiting of liquid into the separation chamber in the reverse direction allowed by the one-way valve 22 as well as prevents unacceptable frequencies of discharge to a water body which is intended to only receive filtered liquid overflow.
  • Figure Ic illustrates the liquid level 18 in main chamber 14 rising above weir 20. Once liquid level 18 crests the top of weir 20 the liquid containing entrained bodies 19 enters separation chamber 21 and flows down a curved face of a screen wall 28 that acts as a filter in filtering bodies 19 from liquid flow.
  • the convexly curved screen 28 is shaped so that overflow liquid is always in contact with the screen up to the maximum treatable overflow.
  • Screened liquid as well as unscreened liquid flows- down through the separation chamber 21 and is caught by an open liquid flush holding means in the form of a trough 30.
  • Screen wall 28 is joined to and extends from the top of weir 20 and curves convexly downward to terminate at a floor 31 of trough 30 and at a point spaced from walls 32, 33 and 34 of trough 30.
  • liquid flowing into separation chamber 21 will collect in trough 30 on either side of screen 28 but floating or other solid bodies 19 collect in trough 30 on the unfiltered side of screen 28. Since the trough 30 is open and does not impinge on the screen 28, the entire area of the screen is available for filtering.
  • a rear wall 33 defines the rear wall of trough 30 on the unfiltered side and extends vertically upward to a height comparable to the height of weir 20.
  • Rear wall 33 contains overflowing liquid in the separation chamber and directs the liquid towards trough 30. In times of severe overflow, liquid is allowed to flow over rear wall 33 bypassing the separation chamber 21 straight to an overflow outlet 38.
  • a screened partition 41 mounted on top of rear wall 33 prevents transfer of large solids and other waste over rear wall 33 during bypassing overflow.
  • Overflow wall 32 of trough 30 is positioned opposite rear wall 33 and is a low wall that is spaced from weir 20 to form a gap 35 so as to allow filtered liquid to overflow trough 30 and flow down through gap 35 into a discharge chamber 36 from where the filtered liquid flows out of the separator 10 through overflow outlet 38 and towards a water body (not shown) capable of taking overflows.
  • baffle wall 40 is placed in front of the weir to provide a throttling action.
  • the baffle wall 40 dampens turbulent surges to evenly distribute the flow along the weir and so improve the separating capacity of the curved screen.
  • the baffle wall 40 is mounted in the main chamber 14 to hang spaced a distance from the weir 20. The bottom of wall 40 hangs lower than the top of weir 20 such that overflowing liquid is forced through gap 46 in order to enter separation chamber 21.
  • Baffle wall 40 may be mounted in main chamber 14 by several ways. It may be mounted to hang from ceiling 45 of main chamber 14. Alternatively, the baffle wall may be suspended in position spaced from weir 20 in main chamber 14 by horizontal bars (not shown) extending between the bottom of baffle wall 40 and the top of weir 20 and/or between baffle wall 40 and rear wall 33. The horizontal bars would be spaced along the length of the baffle and along the lengths of the weir and/or rear wall.
  • the wall 40 is partly submerged which suppresses the effect of surges in the main chamber on overflow liquid flow rates. It has been found that flow rate fluctuations can be suppressed by around 95% by using the wall 40.
  • the wall 40 is effective in improving the evenness of distribution of overflowing liquid along the crest of weir and hence the efficiency of solids/liquid separation of screen 28.
  • Another advantage of the partly submerged wall 40 is to act as a size restrictor in that it prevents floating sewer solids larger than the valve's return outlet 26 from entering separation chamber 21 and possibly blocking outlet 26. This is achieved by limiting the gap 46 between wall 40 and weir 20 and specifically limiting the gap 46 to a distance equal to or less than the size of the return outlet 26.
  • valve opens permitting retained liquid in trough 30 to flush the solids 19 through return outlet 26 into valve chamber 23 and through return conduit 25 back into the main chamber 14 where the now diminished sewage flow collects the liquid entrained with solids and carries the solids to the waste treatment area.
  • the floor 31 of trough 30 is inclined towards return outlet 26 forming a sloping central gutter 37, as shown in Figure Ic.
  • Return outlet 26 is located at a lowest point of the gutter 37 so that all liquid contained in the trough flows down the central gutter and drains through the return outlet 26.
  • return outlet 26 and one-way valve 22 are located substantially central along the length of trough 30.
  • Figure Ie illustrates ball valve 24 in the open position to allow liquid and bodies 19 to flow back down through the return system into main chamber 14.
  • section of trough 30 between overflow wall 32 and screen 28 is divided into segments by side walls 34 that are substantially the same height as the height of overflow wall 32.
  • trough design may include ensuring that sufficient flush flows originate from both ends of the trough in order to adequately flush away sewer solids towards the central return outlet 26.
  • One variation may include raising the height of the end transverse (side) walls 34 of the trough together with adjacent sections of overflow wall 32, so that more flush liquid is stored in these last trough segments to facilitate the flushing action.
  • Figure Id shows a cross-section through the one-way valve 22 with the ball 24 closing off outlet 26 during liquid overflow.
  • Figure Ie shows the centrally located valve 22 during chamber emptying with flush liquid together with sewer solids 19 flowing into it and returning to main chamber 14 via return conduit 25.
  • Figures 3 and 4 show further views of the valve in the closed position.
  • the ball 24 is a floating ball captured in valve chamber 23.
  • the chamber has a ceiling that is inclined upwards towards the central return outlet 26 located at an apex of the ceiling. The inclined ceiling guides the ball 24 toward the outlet 26 as the liquid level rises in chamber 23.
  • a pointed stop or wedge 48 on the floor of the valve chamber ensures that during emptying the ball is directed sideways of the wedge to move to one side or the other of the valve housing and provide room for the passage of flush liquid and screened sewer solids 19 to the return conduit 25 and then on to main chamber 14.
  • a stop wall 50 shown in Figures Ib, Id, Ie and 4 prevents the ball 24 from blocking return conduit 25 by keeping the ball 24 away from the return conduit.
  • a manhole access 44 located in ceiling 45 above separation chamber 21 allows maintenance and cleaning to be carried out.
  • a manhole access may also be located in the ceiling above main chamber 14.
  • Figure 5 illustrates a third mode of operation when liquid overflow entering the separator 10 is so large that it floods the separator.
  • the liquid level 18 rises above weir 20 and exceeds the capacity of the separation chamber.
  • an amount of liquid entrained with bodies 19 is allowed to bypass separation chamber 21 and flow over rear wall 33, down through bypass passage 42 and directly through to overflow outlet 38.
  • This third mode may occur simultaneously with the second overflow mode but the duration of the third mode is relatively short compared to that of the second overflow mode .
  • the screen perforations 50 are limited to the lower portion of the screen 51 with the rear wall 52 also reduced in height to a level just above the top row of the said perforations.
  • all the falling liquid 53 is flowing at super-critical velocity and passes down the screen surface 51 to plunge below the lower water surface 54 against the said screen, shearing away any attached sewer solids 56 and so keeping the said perforations 50 free of matter.
  • the energy of the plunging liquid 53 finally dissipates in a hydraulic jump 55 that maintains the retained sewer solids 56 in suspension thus preventing them from settling.
  • the lowered rear wall 52 limits the depth of liquid 59 in the separation chamber 21 to that which the plunging liquid 53 can penetrate to keep the perforations 50 free of sewer solids 56.
  • the excess flow passes over the lowered rear wall 52 and is discharged from the separator. By this means blockage of the said perforations is prevented even during such excessive overflows.
  • a flush tank 60 may be incorporated behind the curved screen 51 and above the trough 30, as shown in Figure 6.
  • the crest 61 of screen 51 meets the vertical wall 20 horizontally so that overflowing liquid 53 separates from screen 21 at weir crest 61, allowing a portion of liquid to pass through rows of perforations 62 in the weir crest
  • Small one-way ball valves 63 are used to prevent liquid from flowing into trough 30 until the main ball valve 22 has opened and the water level in the latter has consequently fallen.
  • the one-way ball valves 63 then open releasing the stored liquid from flush tank 60 to aid in the flushing of sewer solids through ball valve 22 and back to sewer chamber 14.
  • collection channels 64 run beneath the said rows of perforations and lead the collected liquid 67 to tanks 65, 66 located at either end of the separator.
  • the present separator provides significant advantages over known separators of liquids and solids.
  • the advantages include a more efficient use of the separating mechanism and namely the filtering screens.
  • An effective catchment and a reserve of filtered liquid assist in the self- cleaning of the separator and the flushing of waste materials back into the main liquid flow without the need of an external power source.
  • the separator is furthermore extremely efficient when it matters most, namely during large and violent overflows when the efficiency of known separators is likely to drop.
  • a baffle wall strategically positioned before the inlet into the separation chamber dampens and regulates flows into the separation chamber.
  • the solids separator provides a more reliable and effective means for controlling and regulating the discharge of excess liquid and the containment of waste entrained within the liquid. This in turn leads to a safer, cleaner and certainly a healthier environment .

Landscapes

  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Business, Economics & Management (AREA)
  • Emergency Management (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Sewage (AREA)

Abstract

L'invention concerne un séparateur de solides destiné à être utilisé dans une chambre de déversoir d'égout doté d'une entrée, d'une chambre d'écoulement et d'une sortie principale, où le liquide entraînant les solides s'écoule à partir de l'entrée, traverse la chambre d'écoulement jusqu'à la sortie ; le séparateur de solides comprend : un déversoir de débordement par-dessus lequel le liquide s'écoule pendant le débordement dans une chambre de séparation ; un filtre dans la chambre de séparation qui filtre des solides et permet au liquide de se diriger vers une sortie du débordement ; et un système de retour contenant une valve antireflux, le système de retour renvoyant les solides filtrés vers la chambre d'écoulement et le système de retour possédant un moyen de rétention pour retenir une quantité suffisante de liquide pour renvoyer les solides filtrés vers la chambre d'écoulement.
EP07815453A 2006-11-01 2007-10-31 Séparateur de solides utilisé dans des flux d'écoulement liquides, typiquement des déversoirs d'égouts Withdrawn EP2078120A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU2006906091A AU2006906091A0 (en) 2006-11-01 Solids separator
PCT/AU2007/001649 WO2008052261A1 (fr) 2006-11-01 2007-10-31 Séparateur de solides utilisé dans des flux d'écoulement liquides, typiquement des déversoirs d'égouts

Publications (2)

Publication Number Publication Date
EP2078120A1 true EP2078120A1 (fr) 2009-07-15
EP2078120A4 EP2078120A4 (fr) 2012-01-04

Family

ID=39343690

Family Applications (1)

Application Number Title Priority Date Filing Date
EP07815453A Withdrawn EP2078120A4 (fr) 2006-11-01 2007-10-31 Séparateur de solides utilisé dans des flux d'écoulement liquides, typiquement des déversoirs d'égouts

Country Status (3)

Country Link
EP (1) EP2078120A4 (fr)
AU (1) AU2007314148A1 (fr)
WO (1) WO2008052261A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2480303A4 (fr) * 2009-09-22 2013-03-06 Water Solutions Aust Pty Ltd Séparateur

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9108904U1 (fr) * 1990-09-21 1991-09-12 Nill, Werner, Winterthur, Ch
GB2397538A (en) * 2003-01-23 2004-07-28 G & K Valve Services Ltd Filtration apparatus with automatic backflush
DE102005008743A1 (de) * 2004-02-25 2005-09-22 WATER SOLUTIONS (AUS)PTY LTD, Heathmont Abscheider
WO2006013634A1 (fr) * 2004-08-02 2006-02-09 Tokyo Metropolitan Government Dispositif de contrôle de surface d’eau de type écoulement turbulent pour système de drainage

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3412500A1 (de) * 1984-04-03 1985-10-10 Passavant-Werke AG & Co KG, 6209 Aarbergen Abscheider fuer schwimm- und sinkstoffe
GB9720503D0 (en) * 1997-09-27 1997-11-26 Camplas Technology Improvements relating to storm water overflow tanks
US6655402B1 (en) * 2002-06-13 2003-12-02 U.S. Environmental Protection Agency System and method for vacuum flushing sewer solids

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9108904U1 (fr) * 1990-09-21 1991-09-12 Nill, Werner, Winterthur, Ch
GB2397538A (en) * 2003-01-23 2004-07-28 G & K Valve Services Ltd Filtration apparatus with automatic backflush
DE102005008743A1 (de) * 2004-02-25 2005-09-22 WATER SOLUTIONS (AUS)PTY LTD, Heathmont Abscheider
WO2006013634A1 (fr) * 2004-08-02 2006-02-09 Tokyo Metropolitan Government Dispositif de contrôle de surface d’eau de type écoulement turbulent pour système de drainage

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See also references of WO2008052261A1 *

Also Published As

Publication number Publication date
EP2078120A4 (fr) 2012-01-04
AU2007314148A1 (en) 2008-05-08
WO2008052261A1 (fr) 2008-05-08

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