EP0362343A1 - Separateurs - Google Patents

Separateurs

Info

Publication number
EP0362343A1
EP0362343A1 EP89903786A EP89903786A EP0362343A1 EP 0362343 A1 EP0362343 A1 EP 0362343A1 EP 89903786 A EP89903786 A EP 89903786A EP 89903786 A EP89903786 A EP 89903786A EP 0362343 A1 EP0362343 A1 EP 0362343A1
Authority
EP
European Patent Office
Prior art keywords
chamber
separator chamber
inlet
outlet
storage chamber
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Withdrawn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
EP89903786A
Other languages
German (de)
English (en)
Inventor
John Hill-Venning
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.)
HILL VENNING JOHN
Original Assignee
HILL VENNING JOHN
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 HILL VENNING JOHN filed Critical HILL VENNING JOHN
Publication of EP0362343A1 publication Critical patent/EP0362343A1/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Withdrawn legal-status Critical Current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
    • E03F5/16—Devices for separating oil, water or grease from sewage in drains leading to the main sewer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/0208—Separation of non-miscible liquids by sedimentation
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01D—SEPARATION
    • B01D17/00—Separation of liquids, not provided for elsewhere, e.g. by thermal diffusion
    • B01D17/02—Separation of non-miscible liquids
    • B01D17/0217—Separation of non-miscible liquids by centrifugal force

Definitions

  • This invention relates to interceptors, and particularly to interceptors for separating hydrocarbons such as lubricating oil and fuels from water before the water is discharged to the mains drainage system.
  • interceptors are provided between the source of any such pollution (such as a filling station forecourt) and the mains drainage system. The function of these interceptors is to separate the pollutant from rainwater flowing towards the drainage system, and to store the pollutants until they can be removed for disposal.
  • interceptors Under normal conditions, such interceptors need cope only with small spillages of oily material, and moderate rainfall. Under these conditions, the residence time of the oil/water mix in the interceptor is sufficiently long to enable the oily material to separate from the water under gravity, so that the water entering the mains drainage system is substantially free of oil. However, under conditions . of very heavy rainfall, or where a large spillage of oily material takes place, there is the danger that the interceptor will be overloaded and lubricating oil or fuel will pass to the mains drainage system.
  • GB2167689 discloses interceptors which have a preliminary separator. Under normal conditions, all oil/water mixture reaching the preliminary separator is passed to a storage chamber, but under storm conditions the preliminary separator passes only relatively heavily contaminated water to the storage chamber, while relatively clean water is diverted directly to the outlet, and so is discharged to the mains drainage systera without any further separation taking place under quiescent conditions. Although such separators work well, the oil-laden water passing to the interceptor under storm conditions is at a relatively high pressure, and special measures need to be taken in order to avoid excessive turbulence in the interceptor which could results in some oil and fuel being discharged to the mains drainage system.
  • an interceptor unit comprising a storage chamber and a separator chamber, the separator chamber having an inlet which is directed to promote a circulating flow within the separator chamber about an upwardly extending axis, a transfer duct being provided which has an upwardly directed inlet disposed within the separating chamber, and an outlet disposed within the storage chamber, the storage chamber communicating with an outlet through a dip pipe which extends upwardly from a lower region of the storage chamber, and the separator chamber communicating with the outlet through a waterway which extends from the lower region of the separator and discharges to the outlet over a weir which is disposed above the inlet of the transfer duct.
  • the inlet of the transfer duct is preferably disposed at, or close to, the axis of the circulating flow within the separator chamber.
  • the oil tends to coalesce at the swirl axis and towards the top of the separator chamber, and so the flow into the transfer duct will contain a relatively high proportion of oil or fuel compared to any liquid flowing from the separator chamber to the outlet through the waterway.
  • the surface of the fluid within the separator chamber will not be horizontal, but will assume a generally parabolic shape. Consequently, the liquid level at the inlet of the transfer duct will be relatively low compared to the liquid level at the wall of the separator chamber.
  • the pressure head above the inlet to the transfer duct will be relatively small, whereas the pressure head at the wall of the separator chamber, which balances the hydrostatic pressure within the waterway, is relatively high. The result of this is that the pressure drop across the transfer duct will not increase significantly as the flow rate into the separator chamber increases, and so the flow rate through the transfer duct will remain substantially constant, so avoiding turbulence in the storage chamber.
  • Figure 1 is a diagrammatic plan view of an interceptor
  • Figure 2 is a diagrammatic side view of the interceptor of Figure 1
  • Figure 3 corresponds to Figure 2, but shows the interceptor operating under storm conditions.
  • the interceptor comprises an outer casing 2 which accommodates an inner vessel 4 defining a separator chamber 6.
  • An inlet duct 8 extends through the casing 2 and opens tangentially into the vessel 4 so that flow entering the separator chamber 6 through the inlet 8 promotes a circulating flow within the separator chamber 6.
  • the separator chamber 6 is provided with a transfer duct 10 which has an upwardly extending portion 12 terminating at an inlet opening 14.
  • the transfer duct 10 opens outside the vessel 4 at an outlet 16. Flow from the separator chamber 6 which enters the transfer duct 10 through the inlet opening 14 is thus discharged into the space between the vessel 4 and the casing 2, which space constitutes a storage chamber 18.
  • the separator chamber 6 has an outlet opening 20 at its lower region which opens into an upwardly extending waterway 22. Liquid entering the waterway 22 is discharged over a weir 24 into an outlet box 26, from which an outlet pipe 28 extends. The weir 24 is at a level above that of the inlet 14 of the transfer duct 10.
  • a dip pipe 30 extends from the lower region of the storage chamber 18 into the outlet box 26, terminating at an upwardly facing outlet 32, which is at a level above that of the outlet 16 of the transfer duct 10.
  • the wall of the vessel 4 has an opening 34 at its upper region, above the level of the opening 14 of the transfer duct 10, which provides communication between the separator chamber 6 and the storage chamber 18. More particularly the bottom edge of the opening 34 is above the maximum water level reached in the separator chamber 6 when the incoming flow contains little oily matter.
  • the casing 2 is provided with an upper opening 38 constituting a man hole for providing access to the interior of the casing 2 when the interceptor is installed underground.
  • Figure 2 represents the interceptor during normal operation, i.e. when rainwater runoff from the surrounding area (such as a filling station forecourt) into the interceptor is at a relatively low level, and when the rainwater carries with it only minor spillages of lubricating oil or fuel.
  • the flow through the inlet 8 is at a relatively low rate, and so, although the mixture within the separator chamber 6 circulates, it does so slowly and the surface 40 of the mixture within the separator chamber 6 can be regarded as horizontal.
  • the surface 40 is at the inlet 14 of the transfer duct 10, and so any further flow through the inlet 8 is accompanied by flow of the upper layer of mixture in the separator chamber 6 through the transfer duct 10 into the storage chamber 18.
  • any pollutants such as lubricating oil or fuel in the mixture in the separator chamber 6 will tend to coalesce at the surface 40, and so the liquid reaching the storage chamber 18 will have a relatively high proportion of pollutants.
  • the waterway 22, since it is supplied from the lower region of the separator chamber 6, will contain water which is substantially unpolluted by lubricating oil or fuel.
  • Its surface 42 is shown somewhat lower than the surface 40, because the mixture in the separator chamber 6, containing lubricating oil and fuel, will have a slightly lower average specific gravity than the water in the waterway 22.
  • Liquid entering the storage chamber 18 through the transfer duct 10 will displace an equal volume of substantially clean water through the dip pipe 30 into the outlet box 26, from which it will flow through the outlet 28 to the mains drainage system. Any lubricating oil or fuel entering the interceptor through the inlet 8 will, therefore, be trapped near the surface of the body of liquid within the storage chamber 18, for periodic extraction through the opening 38, and subsequent disposal.
  • the relatively rapid circulating flow within the separator chamber 6 will cause any oil or fuel to move towards the axis of the circulating flow, so that, as before, the water flowing into the waterway 22 will be substantially uncontaminated.
  • the water overflowing the weir 24 into the outlet box 26 will contribute to the static pressure head within the dip tube 30, enabling the liquid level ' 36 in the storage chamber 18 to rise temporarily, so increasing the residence time of liquid within the storage chamber 18. Since an increased residence time increases the separating efficiency within the storage chamber 18, this effect reduces the level of pollutants reaching the outlet 28 through the dip pipe 30.
  • the excess (which will consist almost entirely of the fuel) will flow rapidly to the storage chamber 18 through the opening .34.
  • the level . of the lower edge of the opening 34 is situated above the normal maximum height which will be reached by the liquid in the separator chamber under high flow conditions ( Figure 3) before overflow takes place over the weir 24.
  • the column of water in the waterway 22 can support a higher body of less dense oily material, the level in the separator chamber 6 can rise to that of the lower edge of the opening 34 when a large quantity of oily material enters the interceptor.
  • the interceptor described above is thus not only capable of coping with normal spillage and rainfall, but can also accommodate storm conditions and major spillages without the danger of oil or fuel being passed, in significant quantities, to the mains drainage system.
  • the interceptor may be provided with level detectors and other monitoring equipment for providing appropriate signals when the interface between the water and oily matter in the storage chamber 18 reaches a predetermined level at which the oily matter should be removed.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (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)
  • Removal Of Floating Material (AREA)

Abstract

Unité d'interception servant à empêcher des matières oléagineuses de pénétrer dans le système d'écoulement principal, comprenant une chambre de séparation (6) et une chambre d'entreposage (18). L'eau de pluie et les matières oléagineuses pénètrent dans la chambre de séparation (6) par une ouverture tangentielle (8) où on les met en circulation pour les séparer. Les matières oléagineuses surnagent et passent, à travers un conduit de transfert (10), dans la chambre d'entreposage (18). Un tuyau plongeur (30) passe du fond de la chambre d'entreposage (18), où l'eau est relativement peu contaminée, à une boîte de sortie (26), de sorte que c'est uniquement de l'eau propre qui atteint la sortie (28). Si le débit est important, de l'eau relativement propre de la partie inférieure de la chambre de séparation (6) peut arriver jusqu'à la boîte de sortie (26) en passant par un canal (22). En cas de fuite importante d'huile ou de combustible, l'huile ou le combustible du haut de la chambre de séparation (6) peut s'écouler vers la chambre d'entreposage (18) à travers une ouverture de trop-plein (34).
EP89903786A 1988-03-02 1989-03-01 Separateurs Withdrawn EP0362343A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8804922 1988-03-02
GB888804922A GB8804922D0 (en) 1988-03-02 1988-03-02 Interceptor

Publications (1)

Publication Number Publication Date
EP0362343A1 true EP0362343A1 (fr) 1990-04-11

Family

ID=10632682

Family Applications (1)

Application Number Title Priority Date Filing Date
EP89903786A Withdrawn EP0362343A1 (fr) 1988-03-02 1989-03-01 Separateurs

Country Status (5)

Country Link
EP (1) EP0362343A1 (fr)
AU (1) AU3289989A (fr)
FI (1) FI895166A0 (fr)
GB (1) GB8804922D0 (fr)
WO (1) WO1989007971A1 (fr)

Families Citing this family (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5158678A (en) * 1990-09-28 1992-10-27 Broussard Paul C Sr Water clarification method and apparatus
DE4330552C2 (de) * 1993-09-09 1997-06-12 Passavant Werke Abscheider mit Beruhigungszone zum Abtrennen von mineralischen Leichtstoffen
PT960643E (pt) * 1998-05-18 2005-09-30 Awas Ag Separador para separar uma mistura liquida de duas fases em liquido leve e liquido pesado
US6991114B2 (en) 2003-09-17 2006-01-31 Vortechnics, Inc. Apparatus for separating floating and non-floating particulate from a fluid stream
MX2008014895A (es) 2006-05-22 2009-01-29 Contech Stormwater Solutions I Aparato para separar particulas del agua pluvial.
CN108166602A (zh) * 2018-02-06 2018-06-15 北京北排水务设计研究院有限公司 自调节优化安全排放污水雨水系统及其使用方法

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3444077A (en) * 1965-01-21 1969-05-13 Harvey E Finch Liquid clarifying method
DE2114506A1 (en) * 1971-03-25 1972-10-05 Reynolds Submarine Services Corp., Miami, Fla. (V.StA.) Clearing floating oil
US3931011A (en) * 1973-11-19 1976-01-06 Racor Industries, Inc. Fluid separation apparatus
US4483774A (en) * 1984-03-16 1984-11-20 Brill Eugene L Oil concentrating method and apparatus
GB8429094D0 (en) * 1984-11-16 1984-12-27 Hill Venning J Gravity interceptors

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO8907971A1 *

Also Published As

Publication number Publication date
AU3289989A (en) 1989-09-22
WO1989007971A1 (fr) 1989-09-08
FI895166A0 (fi) 1989-10-31
GB8804922D0 (en) 1988-03-30

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