EP0048158A2 - Réservoir d'interception - Google Patents

Réservoir d'interception Download PDF

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Publication number
EP0048158A2
EP0048158A2 EP81304205A EP81304205A EP0048158A2 EP 0048158 A2 EP0048158 A2 EP 0048158A2 EP 81304205 A EP81304205 A EP 81304205A EP 81304205 A EP81304205 A EP 81304205A EP 0048158 A2 EP0048158 A2 EP 0048158A2
Authority
EP
European Patent Office
Prior art keywords
chamber
tank
outlet
liquid
interceptor
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Withdrawn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
EP81304205A
Other languages
German (de)
English (en)
Other versions
EP0048158A3 (fr
Inventor
Norman Wilfrid Purtell
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP0048158A2 publication Critical patent/EP0048158A2/fr
Publication of EP0048158A3 publication Critical patent/EP0048158A3/fr
Withdrawn legal-status Critical Current

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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

Definitions

  • This invention is concerned with improvements relating to interceptor tanks, particularly of the kind (hereinafter referred to as being of the kind specified) which are installed in drainage systems, such as at petrol filling stations, to prevent liquid of low specific gravity (such as oil or petrol) from being discharged with surface water.
  • liquid of low specific gravity such as oil or petrol
  • Interceptor tanks of the kind specified conventionally comprise a number of laterally adjacent compartments, separated by downwardly-extending partitions, so that when a mixture of water and oil is ducted into the interceptor, the oil (being of lower specific gravity than the water) is trapped in upper parts of the compartments and water relatively free from oil is discharged into the sewage system.
  • an interceptor tank of the kind specified comprising two vertically-spaced partitions dividing the tank into three generally superposed separation chambers, and inlet means by which water may be delivered to the lowermost chamber, the partitions being provided with apertures whereby water may pass upwardly from the lowermost to successively higher chambers, and through an outlet from the uppermost chamber, a supplementary compartment being provided which is connected at least to the two lower chambers in a manner whereby liquid of a specific gravity less than one may flow therefrom into the supplementary compartment, the supplementary compartment having an outlet through which low specific gravity liquid may flow, which is positioned at a level higher than the outlet from the uppermost chamber.
  • the outlet from the supplementary compartment extends to a collection chamber into which liquid of low specific gravity flows from the supplementary compartment.
  • liquid of low specific gravity liquid may be removed from the collection chamber without disturbance to the conditions pertaining in the interceptor tank itself.
  • the lowest point of the outlet from the supplementary compartment is at a level higher than the highest point of the outlet from the highermost chamber.
  • liquid water
  • the head of liquid of low specific gravity in the supplementary compartment is sufficiently high.
  • a large head of liquid of low specific gravity in the supplementary compartment may be obtained, tending to ensure that the liquid which flows through the outlet from the supplementary compartment is contaminated with water to a minimal extent only.
  • the partitions are inclined to the horizontal. In this manner the highermost positions of the chambers will be at specific locations, providing for a concentration of liquid of lower specific gravity and a convenient ducting of such liquid into the supplementary compartment.
  • the partition separating the lowermost chamber from the intermediate chamber is inclined to the horizontal at a relatively small: angle, whilst the partition which divides the intermediate from the highermost chamber is or comprises a part which is inclined to the horizontal at a greater angle.
  • the partition dividing the intermediate chamber from the highermost chamber may comprise a part which extends vertically.
  • the supplementary compartment is tapered, decreasing in cross-sectional area in the upward direction. In this manner, a greater criticality may be obtained at the point of discharge of low specific gravity liquid from the supplementary compartment in relation to the quantity of liquid entering the supplementary compartment.
  • the partitions provide surface sloping downwardly within the tank and towards a central of the tank whereby solid materials which may be carried into the tank and which pass upwardly through the communi cation apertures in the partitions may fall away from said communication apertures towards the central part.
  • each of the partitions comprises, at the central part of the tank, an opening through which solid materials may fall from the uppermost and intermediate chambers into the lowermost chamber, whereby such solid materials may be removed from the tank in a single operation.
  • the tank comprises a single valve member which, when in position, closes these openings, and which may be removed therefrom when it is desired to remove such solid materials from the tank.
  • both partitions comprise frusto-conical portions, said partitions extending upwardly and outwardly from a central vertical axis of the tank, and preferably the central axis of at least the lowermost partition is inclined to the vertical axis.
  • the interceptor tank comprises a generally spherical body 6, divided into lower, intermediate and upper separation chambers 8, 10, 12 respectively, by vertically-spaced partions 14, 16.
  • the partition 14 comprises a main portion which is frusto-conical in form, the axis of the frustrume thereof being inclined to the vertical, the lowermost chamber 8 extending, at the location where the junction between the partition 14 and the peripheral wall of the body 6 is highest, into a supplementary compartment 18 which extends upwardly to ground level, terminating in a vent pipe 33.
  • the partition 16 comprises a lowermost part 15, which similarly is generally frusto-conical, but with axis vertical, and a vertical part 17, said vertical part 17 extending upwardly beyond the confines of the spherical body 6.
  • Each of the partitions 14 and 16 is provided with a central opening 20, 22 respectively, the tank comprising a valve member 24 which, when in operative position, seats against lips bounding the openings 20 and 22, to close the openings.
  • the partition 14 is provided at radially outer portions with a plurality of circumferentially spaced communication apertures or slots 26, and the vertical part of the partition 16 is provided with a plurality of circumferentially spaced communication apertures or slots 28. As is shown in the drawings, the communication apertures 28 are thus at radially inner locations, compared with the location of the apertures 26.
  • a transfer conduit 30 Extending from the uppermost region of the intermediate chamber 10 (as defined by the junction between the partition 18 and the peripheral wall of the body 6) into an upper portion of the supplementary compartment 18 is a transfer conduit 30.
  • the vertical wall 17 extends upwardly beyond the confines of the wall of the body 6, and provides a generally cylindrical upper portion 34 of the interceptor tank. Extending through the upper portion 34 and in communication with a vertical pipe 36 which extends from the portion 34 into the uppermost chamber 12, is an outlet 38, which is connected to an outlet pipe 40.
  • the interceptor tank also comprises an inlet pipe 42, which extends through the body and downwardly through the superposed compartments 12, 10 and 8, and opens into a lowermost part of the interceptor tank.
  • the supplementary compartment 18 comprises an outlet 32, through which liquid may flow from the compartment 18 and which is positioned at a level higher than the level of the outlet 38 through which liquid flows from the uppermost chamber 12.
  • the interceptor tank which is the preferred embodiment of this invention will be mounted at a position below ground level (indicated G/L in the drawings) as is shown.
  • Liquid comprising generally water, low specific gravity liquid such as oil, and suspended solids, will be delivered to the lowermost chamber 8 through the inlet pipe 42. Displaced water will flow through the communication apertures 26 into the chamber 10, whilst oil will travel up the slope of the partition 14 towards and into the supplementary compartment 18, some oil however being carried through the communication openings 26 into the chamber 10.
  • such transference through the outlet 32 into the chamber 50 does not take place until a considerable quantity of low specific gravity liquid has been collected within the supplementary compartment 18, as is shown in the drawing, since this ensures that the low specific gravity liquid will have had a sufficient residence time in the compartment 18, to ensure that most at least of the water contained in suspension therein will have fallen therefrom, ensuring a minimum pollution of such liquid with water.
  • the distance between the lowermost point of the outlet 32 and the highermost point of the outlet 38 (shown X) is in the order of two to three inches.
  • the oil transfer pipe 48 extending between the outlet 32 and the collection chamber 50 may be provided with means to facilitate variation of this distance to enable the distance to be adjusted in accordance with the specific gravity of the liquid being collected.
  • the point of transference of such liquid from the supplementary compartment 18 into the collection chamber 50 may be increased.
  • an opening 44 which may be a venturi opening, is located in the inlet pipe 42 at a position, about one inch below the water level.
  • water entering the interceptor tank through the inlet pipe 42 will draw the surface layer of water from the uppermost chamber 12 back into the inlet pipe, for recirculation. In this manner, the freedom of the water being discharged to the sewage system through the outlet pipe 40 may be further reduced.
  • Non-bouyant solid material which may be carried into the interceptor tank with the inflowing water will initially settle at the base of the lowermost chamber 8. However, some suspended solids will initially be carried through the communication apertures 26 into the intermediate chamber 10; since the turbulance within the tank decreases in proportion to the distance from the termination of the inlet pipe, on passing through the communication apertures 26 and entering more quiescent liquid, some at least of the suspended solids will fall from suspension towards the central opening 20. Other solids will remain in suspension, to fall therefrom subsequent to passage through the communication apertures 28, where they will fall towards the central opening 22 of the partition 16.

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)
  • Sewage (AREA)
EP81304205A 1980-09-17 1981-09-15 Réservoir d'interception Withdrawn EP0048158A3 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8029973A GB2083850A (en) 1980-09-17 1980-09-17 Drainage interceptor tank
GB8029973 1980-09-17

Publications (2)

Publication Number Publication Date
EP0048158A2 true EP0048158A2 (fr) 1982-03-24
EP0048158A3 EP0048158A3 (fr) 1982-12-08

Family

ID=10516115

Family Applications (1)

Application Number Title Priority Date Filing Date
EP81304205A Withdrawn EP0048158A3 (fr) 1980-09-17 1981-09-15 Réservoir d'interception

Country Status (2)

Country Link
EP (1) EP0048158A3 (fr)
GB (1) GB2083850A (fr)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985004204A1 (fr) * 1984-03-17 1985-09-26 Kappler Guenter Installation pour le traitement des eaux usees des routes
WO1998001395A1 (fr) * 1995-06-26 1998-01-15 Terje Johan Myrhaug Separateur d'huile/graisse

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB8518316D0 (en) * 1985-07-19 1985-08-29 Klargester Environmental Eng L Sewage treatment plant

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1126760B (de) * 1960-04-01 1962-03-29 Koch August G Maschinen Entoeler fuer Wasser-OEl-Gemische, insbesondere fuer die Entoelung des Bilgewassers von Schiffen
US3862039A (en) * 1973-03-28 1975-01-21 Robert L Summers Gravity oil-water separator with two interconnected singular cells having automatic free oil discharge
FR2348892A1 (fr) * 1976-04-23 1977-11-18 Ballast Nedam Groep Nv Dispositif separateur de substances insolubles de l'eau qui les contient
CH627087A5 (en) * 1974-06-11 1981-12-31 Ind Patente Anstalt Process and plant for preserving the original properties of industrial treatment liquids and in particular of aqueous coolant emulsions of emulsifiable oil

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE1126760B (de) * 1960-04-01 1962-03-29 Koch August G Maschinen Entoeler fuer Wasser-OEl-Gemische, insbesondere fuer die Entoelung des Bilgewassers von Schiffen
US3862039A (en) * 1973-03-28 1975-01-21 Robert L Summers Gravity oil-water separator with two interconnected singular cells having automatic free oil discharge
CH627087A5 (en) * 1974-06-11 1981-12-31 Ind Patente Anstalt Process and plant for preserving the original properties of industrial treatment liquids and in particular of aqueous coolant emulsions of emulsifiable oil
FR2348892A1 (fr) * 1976-04-23 1977-11-18 Ballast Nedam Groep Nv Dispositif separateur de substances insolubles de l'eau qui les contient

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985004204A1 (fr) * 1984-03-17 1985-09-26 Kappler Guenter Installation pour le traitement des eaux usees des routes
WO1998001395A1 (fr) * 1995-06-26 1998-01-15 Terje Johan Myrhaug Separateur d'huile/graisse

Also Published As

Publication number Publication date
EP0048158A3 (fr) 1982-12-08
GB2083850A (en) 1982-03-31

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Effective date: 19831114