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EP0234031A2 - Dispositif d'enlèvement de substances flottantes des eaux polluées - Google Patents

Dispositif d'enlèvement de substances flottantes des eaux polluées Download PDF

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Publication number
EP0234031A2
EP0234031A2 EP86117405A EP86117405A EP0234031A2 EP 0234031 A2 EP0234031 A2 EP 0234031A2 EP 86117405 A EP86117405 A EP 86117405A EP 86117405 A EP86117405 A EP 86117405A EP 0234031 A2 EP0234031 A2 EP 0234031A2
Authority
EP
European Patent Office
Prior art keywords
tank
wheels
floating
liquid
oil
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
EP86117405A
Other languages
German (de)
English (en)
Other versions
EP0234031B1 (fr
EP0234031A3 (en
Inventor
Vittorio Arcari
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
Priority to AT86117405T priority Critical patent/ATE80681T1/de
Publication of EP0234031A2 publication Critical patent/EP0234031A2/fr
Publication of EP0234031A3 publication Critical patent/EP0234031A3/en
Application granted granted Critical
Publication of EP0234031B1 publication Critical patent/EP0234031B1/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
    • E02B15/104—Conveyors; Paddle wheels; Endless belts

Definitions

  • This invention relates to an apparatus for depolluting waters of floating substances.
  • the invention relates to an apparatus for depolluting sea, lake and river waters of oily and solid pollu­tants, with recovery of the pollutant substances.
  • the main causes of oil pollution are leakages due to oil tanker damage, the washing of tanks in the open sea, occasional industrial discharge, and accidents to coastline storage tanks.
  • Systems using recovery can be of mechanical or gravity type.
  • Mechanical systems comprise apparatus of disc, belt or suction type.
  • the discs and belts utilise the adherence of the oil to the respective metal surfaces, which rotate slowly semi-immersed in the liquid.
  • the disc or belt rotates through the oily layer, and the oil which adheres to the surface is removed by suitable rubber brushes and conveyed into a collection channel.
  • the suction system uses a principle identical to the vacuum cleaner.
  • the suction mouth is kept in proximity to the surface by suitable floats so that it draws in only the adjacent liquid layer.
  • Another system consists of a long endless belt of length 10 or 20 metres formed from sponge fibres and left floating on the surface while kept slowly moving.
  • the belt passes through a roller system which squeezes the absorbed oil from it and releases it ready to reabsorb further oil, while at the same time driving the belt with slow circular movement.
  • Roller system which squeezes the absorbed oil from it and releases it ready to reabsorb further oil, while at the same time driving the belt with slow circular movement.
  • Mechanical systems of the known art are generally complicated and costly. For example the amount of oil collected by a single disc is only small, and therefore many discs in parallel are required.
  • the quantity of water accompanying the collected oil is high, varying from 10% to 40% of the collected oil by weight.
  • a further drawback is that the collected oil quantity varies with variation in the temperature and viscosity of the dispersed oil.
  • Water bearing the oil is made to enter a tank, the dimensions of which are calculated so that the liquid moves only at low speed.
  • the oil rises to the surface to create a layer of increasing size whereas the water leaves from the discharge pipe at the base of the tank.
  • a surface skimming channel enables the oil to leave and be collected.
  • This sytem is used universally today in all civil and industrial water purification plants for the removal of oil and grease.
  • the system is simple and reliable, and the collected oil contains only traces of water which in any event do not compromise the further use of the collected oil in an industrial cycle.
  • the apparatus is suitable for incorporation into large basins or tanks, and if suitably equipped can operate in lakes, ports or on the open sea.
  • the apparatus for removing floating polluting substances from the sur­face of water comprises a bottomless periferically sealed tank and, at the front of the tank one or more wheeles presenting paddle-like spokes suitable for conveying and transferring the liquid containing floating polluting substances from the outer part to the central part on the tank, thus causing a thickening of the layer of polluting mat­ter up to the level of a skimming system which allows to collect the polluting substance from the surface of the water in the periferically tight tank and to transfer it to a recovery system.
  • Figure 1 illustrates the principle of operation of the apparatus according to the invention
  • Figure 2 illustrates a floating, self-propelled application of the said apparatus.
  • the tank 5 is a structure comprising four side walls but no bottom. It can be of fixed type or of floating, mobile self-­propelled type.
  • the wheels 1 and 2 define with their blades various sectors, and in Figure 1 it can be seen that the wheel 1, rotating anti­clockwise, withdraws a surface liquid sector A from the outer part of the tank 5 and transfers it to the sector B, in the central part of said tank.
  • the layer C ⁇ of pollutant substance inside the tank 5 assumes a greater thickness than the layer C of the said pollutant substance outside the tank.
  • D indicates the underlying body of water.
  • the pollutant liquid is oil, its water content is practically nil and this enables the dispersed liquid to be totally recovered and reused.
  • a suitable skimming system 6 inserted into the tank enables the floating pollutant substances to be collected.
  • the recovered substances are then transfered by normal means such as pipes, suction pumps and the like.
  • Thew apparatus shown in the floating, self-propelled application of Figure 2 can vary in dimensions according to requirements.
  • the front and rear walls of the tank 5 are in the form of grids 7 with a mesh size calculated in relation to the maximum dimensions of any solids which may be conveyed within the bladed wheels 1 and 2.
  • Brushes fixed to the inner surface of the side walls of the tank 5 ensure that the lateral surfaces of the wheels 1 and 2 seal against these walls so as to prevent any dispersal of the layer floating within the tank 5.
  • the blades of the wheels 1 and 2 are grooved in the part close to the hub to allow any air bubbles to escape, thus ensuring a constant conveyed liquid level.
  • the rotational speed of the blades 1 and 2 is a critical parameter in ensuring that there is no turbulence and no general movement of the liquids or materials within the tank 5, in order to ensure a degree of rest within the tank which is sufficient to allow separation of the two layers.
  • This rotational speed can for example be between 5 and 20 revolutions per minute.
  • a further parameter which influences the efficiency of the apparatus is the dimensions of the wheels 1 and 2.
  • the wheel diameter can range from 0.5 to 3 metres
  • the wheel length can range from 0.5 to 5 metres
  • the volume of liquid conveyed by the sectors can range from 10 to some thousands of cubic metres per hour.
  • the shafts of the wheels 1 and 2 lie above the surface reached by the liquid mass within the tank 5, in order to prevent any part of the pollutant material being picked up and dragged to the outside by the blades.
  • a system can be constructed in which the height of the wheel shafts can be varied, so enabling both the volume of the conveying sectors to be varied, and the shafts to be raised further above the surface of the materials contained in the tank should said surface rise beyond the predicted limits and faster than the skimming system can cope with.
  • the dimensions of the tank 5 in terms of length and height of the walls vary according to the conditions of the environment in which the depolluting operation takes place.
  • the drive system 3 can be of internal combustion, electric or compressed air type, and the transmission is preferably hydraulic to allow simple adjustment both of the direction of rotation and of the speed of rotation.
  • the drive unit is disposed in a raised position so as not to interfere with the tank liquid surface.
  • skimming system 6 is chosen individually, according to the pollutant substance to be collected, the collection system used, and the environmental conditions.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Removal Of Floating Material (AREA)
  • Physical Water Treatments (AREA)
  • Cleaning Or Clearing Of The Surface Of Open Water (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
  • Cleaning In General (AREA)
  • Artificial Fish Reefs (AREA)
  • Paper (AREA)
  • Prevention Of Fouling (AREA)
EP86117405A 1986-02-25 1986-12-15 Dispositif d'enlèvement de substances flottantes des eaux polluées Expired EP0234031B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT86117405T ATE80681T1 (de) 1986-02-25 1986-12-15 Vorrichtung zum saeubern von verunreinigten wasseroberflaechen.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT1953586 1986-02-25
IT19535/86A IT1189995B (it) 1986-02-25 1986-02-25 Apparecchiatura per il disinquinamento delle acque da sostanze galleggianti

Publications (3)

Publication Number Publication Date
EP0234031A2 true EP0234031A2 (fr) 1987-09-02
EP0234031A3 EP0234031A3 (en) 1989-02-15
EP0234031B1 EP0234031B1 (fr) 1992-09-16

Family

ID=11158858

Family Applications (1)

Application Number Title Priority Date Filing Date
EP86117405A Expired EP0234031B1 (fr) 1986-02-25 1986-12-15 Dispositif d'enlèvement de substances flottantes des eaux polluées

Country Status (4)

Country Link
EP (1) EP0234031B1 (fr)
AT (1) ATE80681T1 (fr)
DE (1) DE3686765D1 (fr)
IT (1) IT1189995B (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0329374A1 (fr) * 1988-02-18 1989-08-23 Hoyle Marine Ltd. Appareil pour enlever des polluants liquides flottant à la surface de l'eau et son système de contrôle
US5110374A (en) * 1987-08-19 1992-05-05 Mitsubishi Materials Corporation Rare earth-iron-boron magnet powder and process of producing same
WO1998039519A1 (fr) * 1997-03-03 1998-09-11 Aron S.R.L. Materiel de flottement pour recuperer les produits huileux

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3731813A (en) * 1971-05-17 1973-05-08 R Tipton Floating debris recovery apparatus
US3785496A (en) * 1972-07-28 1974-01-15 Craftmaster Inc Oil reclaiming device for removing oil from the surface of water
FR2428709A1 (fr) * 1978-06-14 1980-01-11 Ouest Ets Generaux Meca Perfectionnements aux appareils a palettes souples pour la recuperation des matieres flottantes
FR2456660A1 (fr) * 1979-05-16 1980-12-12 Mellina Serge Engin flottant de recuperation de mazout flottant en surface

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5110374A (en) * 1987-08-19 1992-05-05 Mitsubishi Materials Corporation Rare earth-iron-boron magnet powder and process of producing same
EP0329374A1 (fr) * 1988-02-18 1989-08-23 Hoyle Marine Ltd. Appareil pour enlever des polluants liquides flottant à la surface de l'eau et son système de contrôle
WO1998039519A1 (fr) * 1997-03-03 1998-09-11 Aron S.R.L. Materiel de flottement pour recuperer les produits huileux

Also Published As

Publication number Publication date
IT8619535A0 (it) 1986-02-25
EP0234031B1 (fr) 1992-09-16
IT1189995B (it) 1988-02-10
EP0234031A3 (en) 1989-02-15
IT8619535A1 (it) 1987-08-25
ATE80681T1 (de) 1992-10-15
DE3686765D1 (de) 1992-10-22

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