EP0211475A2 - Système d'écumage - Google Patents

Système d'écumage Download PDF

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Publication number
EP0211475A2
EP0211475A2 EP86303524A EP86303524A EP0211475A2 EP 0211475 A2 EP0211475 A2 EP 0211475A2 EP 86303524 A EP86303524 A EP 86303524A EP 86303524 A EP86303524 A EP 86303524A EP 0211475 A2 EP0211475 A2 EP 0211475A2
Authority
EP
European Patent Office
Prior art keywords
trough
interior
side walls
positionable
semi
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.)
Granted
Application number
EP86303524A
Other languages
German (de)
English (en)
Other versions
EP0211475B1 (fr
EP0211475A3 (en
Inventor
Harold James Beard
Raleigh L. Cox
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 EP0211475A2 publication Critical patent/EP0211475A2/fr
Publication of EP0211475A3 publication Critical patent/EP0211475A3/en
Application granted granted Critical
Publication of EP0211475B1 publication Critical patent/EP0211475B1/fr
Expired legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B15/00—Cleaning or keeping clear the surface of open water; Apparatus therefor
    • E02B15/04—Devices for cleaning or keeping clear the surface of open water from oil or like floating materials by separating or removing these materials
    • E02B15/10—Devices for removing the material from the surface
    • E02B15/106—Overflow skimmers with suction heads; suction heads
    • 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 relates generally to devices which skim the surface of a liquid, and, more particularly, to devices which skim the surface of a moving stream of liquid.
  • intrachannel clarifiers are often employed. Examples of an intrachannel clarifier may be seen in applicant's U.S. Patent numbers 4,362,625; 4,383,922 and 4,457,844. Applicant's clarifier functions by utilizing the hydraulic head losses created by a moving stream of sewage as it passes around and under a stationary semi-submerged structure.
  • Various methods have been used to remove floating matter from the clarified liquid leaving the clarifier. These include a series of baffles or mechanical skimming devices which move across the liquid surface. Baffles tend to disrupt and disturb the flow within the clarifier. Mechanical skimmers require frequent maintenance and comsume energy, increasing system costs.
  • One type of skimmer may be seen in applicant's U.S. Patent Number 4,436,632, which utilizes a float controlled skimming device.
  • a skimmer system for structures having a floor, two side walls and at least one open end, the structure being semi-submersibly positionable in a moving liquid stream.
  • the skimmer system comprises at least one side trough having a bottom, an interior trough wall and an exterior trough wall.
  • the exterior trough wall is coincident with one side wall of the structure and is provided with at least one opening communicating between the interior of the trough and the exterior of the structure.
  • the interior trough wall is provided with at least one opening communicating between the interior of the trough and the interior of the structure.
  • the clarifier structure 1 comprises a bottom 2 and side walls 3 and 4.
  • the structure 1 is semi-submersible in a moving stream of liquid, signified by flow arrows 5.
  • the structure is provided with at least one entry opening 6 through which liquid may enter the structure.
  • frictional head losses around the exterior of the structure 1 will cause the exterior water level 7 to be slightly lower than the interior water level 9. Head losses caused by any restriction in the channel of the stream of liquid further increase the differential between the exterior water level 7 and interior water level 9. Applicant has taken advantage of this head differential for skimming pruposes.
  • At least one side trough 10 is installed inside the structure 1.
  • the side trough 10 comprises an interior trough wall 11, a trough bottom 12 and an exterior trough wall 13. Exterior trough wall 13 may coincide with structure side wall 3, 4 as shown in the Figures.
  • trough bottom 12 may be formed by connecting interior trough wall 11 to a side wall 3,4 in a v-shaped manner. It should be understood that other means of forming trough walls 11 and 13 and bottom 12 may be employed, such as the square-cornered trough shown in Figures 5 anf 6.
  • the v-shaped trough 10 may be given a flat bottom by covering bottom 12 with a filler material 27, such as concrete.
  • Trough entry opening 14 is positioned so as to intercept the interior water level 9, allowing surface liquid from inside the structure 1 to flow into trough 10.
  • the skimmed liquid in trough 10 then exits the skimmer system through exit opening 15.
  • the skimmed liquid may either be removed from the system completely or be returned to the stream flow outside the structure. The latter situation is preferable in sewage applications where the liquid stream outside of the structure is the moving mixed liquor of an oxidation ditch.
  • Trough exit opening 15 should then be positioned so as to intercept exterior water level 7. In this case, a flow is established due to the head differentials between interior water level 9, trough water level 8 and exterior water level 7.
  • vanes 16 may be added to structure side walls 3,4.
  • a dam 28 may be added, along with additional trough exit openings 29 and vanes 30.
  • the interior water level 9 may vary from the front 17 of the structure 1 toward the rear 18 of the structure 1. Since it is desirable to have multiple trough entry openings 14 to establish a uniform skimming action, it is also desirable to be able to adjust the size of each trough entry opening to compensate for the variance in the interior water level 9. As shown in Figure 3, this is accomplished by providing an adjustment plate 19 which is slidably positioned over each trough entry opening 14.
  • the adjustment plate 19 may be made adjustable by such means as slots 20 which may be placed over studs 21 and held in place by nuts 22.
  • Cross troughs 23 may be installed transversely across the structure 1. As shown in Figure 6, the cross trough 23 is constructed similarly to side trough 10, having side walls 24 and 25, and bottom 26. Trough entry openings 14 may be provided on either side of cross trough 23. Cross trough 23 may communicate directly with a trough exit opening 15 or 29 or with side troughs 10, as shown in Figure 1. Of course, cross troughs 23 may also be v-shaped, or take other configurations compatible with the structure 1.
  • a skimmer system of interconnected troughs 10,23 is formed whereby the interior liquid surface is uniformly skimmed of floating matter.
  • the skimmed material may be either removed entirely or returned to the liquid stream exterior of the structure 1.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Removal Of Floating Material (AREA)
EP19860303524 1985-05-10 1986-05-09 Système d'écumage Expired EP0211475B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US73257885A 1985-05-10 1985-05-10
US732578 1985-05-10

Publications (3)

Publication Number Publication Date
EP0211475A2 true EP0211475A2 (fr) 1987-02-25
EP0211475A3 EP0211475A3 (en) 1987-05-27
EP0211475B1 EP0211475B1 (fr) 1989-03-15

Family

ID=24944101

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19860303524 Expired EP0211475B1 (fr) 1985-05-10 1986-05-09 Système d'écumage

Country Status (2)

Country Link
EP (1) EP0211475B1 (fr)
DE (1) DE3662410D1 (fr)

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR952791A (fr) * 1946-11-27 1949-11-23 Standard Oil Dev Co Appareil à séparer des liquides par écumage
FR2217483A1 (en) * 1973-02-15 1974-09-06 World Chem Kk Floating oil slick collector - comprising a motor-driven pump on main float linked by flexible strip to annular float
GB1405560A (en) * 1973-01-15 1975-09-10 Ivanoff A Device for removing oil slicks
FR2429706A2 (fr) * 1978-06-30 1980-01-25 B J Consultant Sarl Perfectionnements apportes a un engin flottant destine notamment a la recuperation d'hydrocarbures a la surface de la mer
FR2488928A1 (fr) * 1980-08-21 1982-02-26 Paringaux Bernard Procede et engin pour la recuperation de produits flottant sur l'eau

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR952791A (fr) * 1946-11-27 1949-11-23 Standard Oil Dev Co Appareil à séparer des liquides par écumage
GB1405560A (en) * 1973-01-15 1975-09-10 Ivanoff A Device for removing oil slicks
FR2217483A1 (en) * 1973-02-15 1974-09-06 World Chem Kk Floating oil slick collector - comprising a motor-driven pump on main float linked by flexible strip to annular float
FR2429706A2 (fr) * 1978-06-30 1980-01-25 B J Consultant Sarl Perfectionnements apportes a un engin flottant destine notamment a la recuperation d'hydrocarbures a la surface de la mer
FR2488928A1 (fr) * 1980-08-21 1982-02-26 Paringaux Bernard Procede et engin pour la recuperation de produits flottant sur l'eau

Also Published As

Publication number Publication date
EP0211475B1 (fr) 1989-03-15
EP0211475A3 (en) 1987-05-27
DE3662410D1 (en) 1989-04-20

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