EP0482102B1 - Apparatus for dissolving agranulate, primarily a predetermined quantity of ferrous sulfate granulate with water - Google Patents

Apparatus for dissolving agranulate, primarily a predetermined quantity of ferrous sulfate granulate with water Download PDF

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Publication number
EP0482102B1
EP0482102B1 EP90912009A EP90912009A EP0482102B1 EP 0482102 B1 EP0482102 B1 EP 0482102B1 EP 90912009 A EP90912009 A EP 90912009A EP 90912009 A EP90912009 A EP 90912009A EP 0482102 B1 EP0482102 B1 EP 0482102B1
Authority
EP
European Patent Office
Prior art keywords
tank
water supply
water
supply device
granulate
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.)
Revoked
Application number
EP90912009A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0482102A1 (en
Inventor
Karl Erik Hovad
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.)
Tunetanken AS
Original Assignee
Tunetanken AS
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
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First worldwide family litigation filed litigation Critical https://patents.darts-ip.com/?family=8122545&utm_source=google_patent&utm_medium=platform_link&utm_campaign=public_patent_search&patent=EP0482102(B1) "Global patent litigation dataset” by Darts-ip is licensed under a Creative Commons Attribution 4.0 International License.
Application filed by Tunetanken AS filed Critical Tunetanken AS
Publication of EP0482102A1 publication Critical patent/EP0482102A1/en
Application granted granted Critical
Publication of EP0482102B1 publication Critical patent/EP0482102B1/en
Anticipated expiration legal-status Critical
Revoked legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F21/00—Dissolving
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/50—Mixing receptacles

Definitions

  • the present invention relates to an apparatus for dissolving a granulate, primarily a predetermined quantity of ferrous sulphate granulate, with water, comprising a tank, a filler hole for introducing the granulate, water inlet means for supplying water to the tank, a primary water supply device provided at the bottom of the tank and connected to the water inlet means and a defined area for accumulating and discharging the solution.
  • an apparatus comprising a tank of this type have a capacity of 10-15 tons of ferrous sulphate granulate and thus an output allowing it to supply a sewage purification plant serving a town of 4,000 - 50,000 inhabitants with a constant and sufficient quantity of ferrous sulphate solution.
  • a control system connected to the tank ensures that the dose of ferrous sulphate solution to the sewage purification plant is proportional to the flow quantity of sewage.
  • the ferrous sulphate binds phosphates present in the sewage, said phosphates consequently precipitating as phosphate sludge.
  • GB-A-979 344 describes a mixing container for preparing a suspension of earth with gas and water for hydraulic and pneumatic conveyance to a pipe line in which a container at the bottom comprises rows of parallel tubes each having a series of perforations through which water can be supplied and which tubes all are connected to the one and same water supply source.
  • DE-A1-2 922 586 discloses a device for producing brine, and which comprises a container with a water supply device in form of a coiled tube with openings positioned at the bottom of the container.
  • the object of the present invention is therefore to provide an apparatus of the type mentioned above, said apparatus being inexpensive to manufacture and allowing the production of a ferrous sulphate solution of as uniform a concentration as is possible, thus ensuring economical operation.
  • each primary water supply devices connected to the water inlet means by connection means, each primary water supply device covering a defined area of the bottom of the tank, the primary water supply device(s) evenly covering the entire bottom of the tank in such a way that the entire extent of the primary water supply device(s) principally provides the same water discharge outlet area per unit area of the bottom of the tank, that at least one primary water supply device, principally in its entire extent, is subdivided into two or more secondary water supply devices in such a way as to cover separate, smaller areas of any defined area of the bottom of the tank and in that control system means for the water inlet maens are provided, which control the water supply in such a way as to supply water in predetermined quantities per unit time and for a predetermined period of time alternatively to the secondary water supply devices.
  • the level of the non-dissolved ferrous sulphate granulate in the tank constantly exceeds a specific, sufficient level and if at the same time the quantity of water supplied per unit time and the supply pressure of water are below specific levels, the result is a sufficient percolation passage and a sufficient water percolation time through the ferrous sulphate granulate, thus always ensuring a production of a "saturated" solution of ferrous sulphate.
  • This ensures a constant production of a ferrous sulphate solution of a uniform concentration (the concentration variations of a "saturated” solution being 2-3% under normal conditions), at the same time allowing the most economical operation of the tank.
  • all secondary water supply devices may, according to the invention, principally and preferably have the same water discharge outlet area per area unit of the bottom of the tank.
  • the tank may, according to the invention, principally be cylindrical with a circular bottom, and the secondary water supply devices of the water supply device may comprise two parallel pipes positioned helically to cover the bottom of the tank, the helical centres preferably being close to the centre of the bottom.
  • the tank is particularly economical to manufacture in view of its output.
  • the mutual radial distance between two adjacent pipes in each of two successive convolutions of the helices may be 10 cm principally anywhere in the tank, and each pipe may on its upper side and in its entire extent be provided with holes at a mutual distance of approximately 20 cm, said holes preferably having a diameter of 1-2 mm.
  • the manufacture of this discharge system is particularly simple and quick.
  • the upper side of the water supply device may be provided as a grate or a sieve.
  • Fig. 1 shows a tank 1 comprising a water supply device 2 provided at the circular bottom 3 of the tank and a filler hole 4 with one end above the level of the ground, the embodiment shown being a tank dug into the ground.
  • the filler hole 4 may be opened and closed by means of a cover 5 operated by means of a winch 6 so that the tank 1 may be filled with ferrous sulphate granulate through the filler hole 4 from a lorry platform to be tipped when required at regular intervals.
  • the tank 1 is provided with outside attachment devices 7 secured to holding means 8, said holding means principally being large concrete blocks with tie bars in the ground.
  • the tank 1 comprises a defined area principally in the shape of a vertical pipe 9 for accumulating the ferrous sulphate solution produced, before said solution is dosed for the sewage purification plant through a pipeline system not shown in the drawings.
  • a pipe connection means 10 connected to a water supply device not shown, the sewage purification plant and a system, not shown, to control the water supply to the tank 1 and the solution of ferrous sulphate dosed from the tank to the purification plant.
  • the tank dug into the ground principally ensures a constant, uniform temperature in the tank, resulting in economical operation during conditions of hard frost.
  • the tank may, however, equally well be positioned on the ground.
  • the tank 1 is principally made of cast fibreglass-reinforced polyester with an internal smooth surface. Having a capacity of 10-15 tons of ferrous sulphate granulate, the tank may have a diameter of 3.35 m and a height of approx. 4 m.
  • the pipe 9 has a diameter of 400 mm.
  • the tank 1 has a capacity sufficiently large to supply a purification plant serving a town of up to 50,000 inhabitants, said quantity being extremely large for such a small tank.
  • the water supply device 2 principally comprises two parallel plastic pipes 2' and 2'', said plastic pipes preferably being polyethylene pipes.
  • the pipes 2' and 2'' are principally positioned helically to cover the bottom 3 of the tank 1 at a radial distance of approx. 10 cm with the helical centre preferably in the centre of the bottom 3 of the tank 1, cf. Fig. 3.
  • the pipes 2' and 2'' are connected to the pipe connection means 10.
  • the pipes 2' and 2'' are primarily secured inside the bottom 3 of the tank 1 by means of radial stringers or the like not shown.
  • each pipe 2' and 2'' is provided with holes at a mutual distance of approximately 20 cm.
  • the holes have a diameter of 1-2 mm. This ensures that anywhere in the tank the water supply device 2 has approximately the same water discharge outlet area per area unit of the bottom of the tank 3. The water supplied is therefore discharged evenly over the entire bottom 3 of the tank and is allowed to percolate evenly through the entire quantity of ferrous sulphate granulate.
  • the level of the non-dissolved ferrous sulphate granulate in the tank constantly exceeds a specific, sufficient level A (in the present embodiment, at some 6-700 mm above the pipes 2' and 2''), and if at the same time the quantity of water supplied per unit time is 300-1,000 l/hour and the supply pressure of water corresponds to that of tap water, the result is a sufficient percolation passage and a sufficient water percolation time through the ferrous sulphate granulate, thus allowing a constant production of a "saturated" solution of ferrous sulphate in water.
  • Half of the ferrous sulphate granulate filled into the tank thus being dissolved, the ferrous sulphate granulate level is typically at B.
  • the upper liquid level is typically kept constant at C.
  • the solution is accumulated in the pipe 9 and is dosed for discharge to the sewage purification plant.
  • Water is supplied alternately and at predetermined intervals to be set by means of the control system from the water inlet means not shown through the pipe connection means 10 to one pipe 2' or to the other pipe 2'', but never simultaneously to both of the pipes 2' and 2''.
  • the result is that the undesirable cone-shaped cavity formation (said formation always appearing in a quantity of ferrous sulphate granulate because of the internal friction and the friction against the tank wall from the granulate) always disappears when the water supply is switched from one pipe 2' to the other pipe 2'' or vice versa. This ensures that water passes in the same flow direction when percolating through the quantity of ferrous sulphate granulate to allow a constant production of a "saturated" solution.
  • the required minimum quantity of ferrous sulphate granulate in the tank before refilling may also be reduced considerably.
  • the device may be varied in many ways without thereby deviating from the scope of the invention.
  • the upper side of the water supply device may be provided as a sieve or the water supply device may comprise a large number of nozzles positioned evenly over the bottom of the tank.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Water Treatment By Sorption (AREA)
  • Separation Of Suspended Particles By Flocculating Agents (AREA)
  • Solid-Sorbent Or Filter-Aiding Compositions (AREA)
  • Treatment Of Water By Oxidation Or Reduction (AREA)
EP90912009A 1989-07-10 1990-07-10 Apparatus for dissolving agranulate, primarily a predetermined quantity of ferrous sulfate granulate with water Revoked EP0482102B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DK3409/89 1989-07-10
DK340989A DK163212C (da) 1989-07-10 1989-07-10 Blandetank, fortrinsvis til oploesning af ferrosulfatgranulat i vand
PCT/DK1990/000181 WO1991000775A1 (en) 1989-07-10 1990-07-10 Mixing tank, primarily for dissolving ferrous sulphate granulate in water

Publications (2)

Publication Number Publication Date
EP0482102A1 EP0482102A1 (en) 1992-04-29
EP0482102B1 true EP0482102B1 (en) 1994-08-31

Family

ID=8122545

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90912009A Revoked EP0482102B1 (en) 1989-07-10 1990-07-10 Apparatus for dissolving agranulate, primarily a predetermined quantity of ferrous sulfate granulate with water

Country Status (5)

Country Link
EP (1) EP0482102B1 (da)
AT (1) ATE110585T1 (da)
DE (1) DE69012126T2 (da)
DK (1) DK163212C (da)
WO (1) WO1991000775A1 (da)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5710833A (en) * 1995-04-20 1998-01-20 Massachusetts Institute Of Technology Detection, recognition and coding of complex objects using probabilistic eigenspace analysis
NL1004112C2 (nl) * 1996-09-25 1998-03-26 Rossmark Van Wijk & Boerma Wat Inrichting voor het oplossen van een vaste stof.

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB979344A (en) * 1960-05-10 1965-01-01 Baggermij Bos & Kalis Nv A method of,and apparatus for,preparing earth for hydraulic or pneumatic conveyance through a pipe line
FR2427790A1 (fr) * 1978-06-07 1980-01-04 Bensimon Victor Dispositif et procede pour la fabrication de saumure

Also Published As

Publication number Publication date
DK163212B (da) 1992-02-10
EP0482102A1 (en) 1992-04-29
DE69012126D1 (de) 1994-10-06
DK340989D0 (da) 1989-07-10
ATE110585T1 (de) 1994-09-15
WO1991000775A1 (en) 1991-01-24
DK163212C (da) 1992-07-13
DK340989A (da) 1991-01-11
DE69012126T2 (de) 1994-12-22

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