WO1996022250A1 - Apparatus for producing air saturated water - Google Patents

Apparatus for producing air saturated water Download PDF

Info

Publication number
WO1996022250A1
WO1996022250A1 PCT/SE1996/000050 SE9600050W WO9622250A1 WO 1996022250 A1 WO1996022250 A1 WO 1996022250A1 SE 9600050 W SE9600050 W SE 9600050W WO 9622250 A1 WO9622250 A1 WO 9622250A1
Authority
WO
WIPO (PCT)
Prior art keywords
water
vessel
air
partly
dispersion
Prior art date
Application number
PCT/SE1996/000050
Other languages
French (fr)
Inventor
Hans Eriksson
Kent Isaksson
Original Assignee
Hans Eriksson
Kent Isaksson
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 Hans Eriksson, Kent Isaksson filed Critical Hans Eriksson
Priority to EP96901179A priority Critical patent/EP0789672B1/en
Priority to AT96901179T priority patent/ATE200272T1/en
Priority to AU44999/96A priority patent/AU4499996A/en
Priority to DE69612366T priority patent/DE69612366T2/en
Publication of WO1996022250A1 publication Critical patent/WO1996022250A1/en

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1431—Dissolved air flotation machines
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/234—Surface aerating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/234—Surface aerating
    • B01F23/2341—Surface aerating by cascading, spraying or projecting a liquid into a gaseous atmosphere
    • B01F23/23413—Surface aerating by cascading, spraying or projecting a liquid into a gaseous atmosphere using nozzles for projecting the liquid into the gas atmosphere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1412—Flotation machines with baffles, e.g. at the wall for redirecting settling solids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1475—Flotation tanks having means for discharging the pulp, e.g. as a bleed stream
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/24—Pneumatic
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/26—Activated sludge processes using pure oxygen or oxygen-rich gas
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/02—Froth-flotation processes
    • B03D1/028—Control and monitoring of flotation processes; computer models therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B03—SEPARATION OF SOLID MATERIALS USING LIQUIDS OR USING PNEUMATIC TABLES OR JIGS; MAGNETIC OR ELECTROSTATIC SEPARATION OF SOLID MATERIALS FROM SOLID MATERIALS OR FLUIDS; SEPARATION BY HIGH-VOLTAGE ELECTRIC FIELDS
    • B03D—FLOTATION; DIFFERENTIAL SEDIMENTATION
    • B03D1/00—Flotation
    • B03D1/14—Flotation machines
    • B03D1/1443—Feed or discharge mechanisms for flotation tanks
    • B03D1/1462—Discharge mechanisms for the froth
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/06—Pressure conditions
    • C02F2301/066—Overpressure, high pressure
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T137/00—Fluid handling
    • Y10T137/0318—Processes

Definitions

  • the present invention refers to an apparatus for producing water saturated with air under high pressure and preferably intended for dispersion in flotation plants, which appara ⁇ tus comprises a preferably standing cylindrical pressure vessel which during operation to a controlled level is partly filled with pressurized water flowing through said vessel and out through a bottom outlet and partly with con ⁇ tinuously added compressed air, whereby during the passage of the water through the vessel air is dissolved in the wa- ter.
  • flotation plants When treating water, drinking water as well as sewage wa- ter, flotation plants are used to an increasing extent in order to increase the rate of flow of the water through the treatment plants and as a consequence of this also making it possible to decrease the size of the necessary basins and thereby the size of the complete treatment plants.
  • the requirements on the finished product are mainly uniform and the design of a treatment plant is mainly decided by the character of the source of water supply. If the source is a lake or a water course usually separation of larger particles is taking place in a filter chamber whereafter the water is subjected to a chemical and biological treatment carried out by means of the addition of precipitation- and flocculation- agents in a flocculation chamber.
  • the particles which are precipi ⁇ tated are then to be separated from the water which can be done by means of sedimentation which means that the parti ⁇ cles through the influence from gravity sink to the bottom in a sedimentation basin.
  • sedimentation which means that the parti ⁇ cles through the influence from gravity sink to the bottom in a sedimentation basin.
  • Different types of particles have different density and therefore different sinking velocity.
  • light particles In order to make it possible for particles having low den ⁇ sity, "light particles”, to sediment while the water passes a sedimentation basin a long time is required which means that the surface of the sedimentation basin must be large.
  • the time for the particle separation could be considerably reduced by means of flotation which means that microscopic air bubbles are added to the water which adhere to parti ⁇ cles or particle flocculations in the water and also con ⁇ tribute in the process of creating particle flocculations and keeping them together.
  • Air bubbles raise fast towards the water surface bringing adhered particles and particle flocculations to the water surface where they create a sta ⁇ ble sludge cover which can be removed by means of scrapers or by intermittently raising the water level in the flota ⁇ tion basin so that the sludge cover transfers to a sludge channel arranged at one of the edges of the basin.
  • the microscopic air bubbles which are used in the flotation procedure have a diameter of 30-80 micrometer and can not be generated for instance by means of the injection of air directly in the water.
  • Microscopic air bubbles for flota- tion of drinking water are usually generated by means of dissolving air in clean water in a pressured vessel under overpressure whereby the biggest possible saturation level is aimed at.
  • This water which usually is called dispersion water is fed with maintained high pressure to the inlet for the flocculated water in the flotation basin positioned at its bottom where it is added to said water via special noz ⁇ zles or sprayers which are designed to give an instantane ⁇ ous decrease in the pressure at which the air dissolved in the water is released in the form of microscopic bubbles creating a dispersion of air in the water.
  • the pressure vessels which are used for the generation of high pressure dispersion water, saturated with air to the greatest possible extent, are usually kept half filled with water by means of a control unit including sensors and the in- and outlets for the water are positioned below the wa ⁇ ter surface in the pressured vessel.
  • the pressure vessel which often is as tall as a man has a reduced diameter and the conse ⁇ quently reduced contact surface between the water and air has been compensated by the feeding of the water through a nozzle arranged in the side wall of the vessel in the air filled space through which nozzle the water is spraying against the opposite wall of the vessel where the water jet to some extent is splitted up.
  • the flotation method has considerably decreased the time for water treatment and the decreased time of flow means that water treatment plants could be made smaller keeping the same capacity.
  • the space requirement of the treat ⁇ ment plants decreases new application fields are opened.
  • Such a development requires that all the devices are made smaller and if possible are given improved characteristics.
  • This also goes for the apparatus for producing dispersion water in which already treated, recirculated, water is used. An increase of the saturation level in the dispersion water decreases the need of recirculated water whereby the efficiency of the whole treatment plant is improved.
  • One object of the present invention is to propose an appa- ratus for producing dispersion water having a high degree of air saturation. Another object is to propose an appara- tus which combines high capacity with small dimensions. This is attained by means of an apparatus having the char ⁇ acteristics according to the appended claims.
  • FIG 1 which schematically and in a side view shows a conventionally equipped flotation basin in section the ba ⁇ sin is generally designated 1.
  • the basin has an inlet 2 to which water is fed from a flocculation chamber, not shown.
  • an inclined barrier 3 arranged in front of the inlet 2 in the basin 1 the water is caused to flow upwards in the basin 1.
  • At the bottom of the pocket which is cre ⁇ ated between the wall 4 of the basin and the barrier 3 a set of tubes provided with nozzles or sprayers debouch, one tube 6 of which is shown in the figure.
  • the tubes 6 feed air saturated water, dispersion water, to the flocculated water fed to the basin through the inlet 2 which water is given an increased movement by the dispersion water in ⁇ jected under pressure.
  • the nozzles or sprayers 5 are so de ⁇ signed that the dispersion water is subjected to an instan ⁇ taneous pressure decrease which releases the air in that water in the form of microscopic bubbles which in their movement towards the water surface adhere particles and particle flocculations and relatively fast carry most of these particles to the water surface where a sludge cover is created which by means of some kind of sludge scraper 7 or in another way is transferred to the sludge channel 8 at the wall 9 of the basin.
  • Heavy particles which the Micro bubbles are not able to lift are collected by the filter 10 which is arranged between the back side of the barrier 3 and the wall 9 of the basin and through which filter the treated water passes on its way via the outlet 11 to a clear water basin, not shown.
  • the vessel 12 in which the dispersion water is produced is provided with com ⁇ pressed air via the air inlet 14 from a compressor, not shown, and the air saturated water is fed back via the out ⁇ let 15 and its branchings 6 to the nozzles 5 arranged in the flotation basin 1.
  • FIG 2 an apparatus according to the invention is shown, schematically and partly in section, for producing dispersion water.
  • the apparatus comprises a vertical pres ⁇ sure vessel 21 which is implemented by means of commer ⁇ cially available tube parts and has the form of an enlarge ⁇ ment on a conduit 22, 23.
  • the inlet tube 22 debouch into a spray-nozzle 24 which has the form of a prolongation of the inlet tube 22, closed at its free end.
  • the envelope surface of the prolongation tube 24 is completely perforated by means of small spray holes 25 only a smaller number of which are shown in figure 2.
  • the pressure vessel 21 is halfway filled with water and two detectors arranged in the wall of the vessel deliver signals to a control unit, not shown, which if necessary decreases or increases the water flow into the vessel alternatively ad ⁇ justs the air pressure in the pressured vessel 21.
  • the feeding of compressed air is carried out via the conduit 27 and is controlled by means of a magnet valve 28 arranged on said conduit.
  • water is spraying, as indi ⁇ cated in figure 2 with a couple of dashed arrows, from the spray-nozzle 24 against the inner wall of the pressured vessel which will be covered by a curtain of water which continuously is provided with new water whereby the air ab- sorbing ability of the curtain all the time is kept at the maximum level.
  • spe ⁇ cially made pressure vessels have for certain purposes been possible to replace with a 4" tube having reduction cou ⁇ plings as end portions and e.g. an inlet conduit of 1" and an outlet conduit of 2".

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biotechnology (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Hydrology & Water Resources (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Microbiology (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Physical Water Treatments (AREA)
  • Cultivation Of Plants (AREA)
  • Gas Separation By Absorption (AREA)
  • Sorption Type Refrigeration Machines (AREA)
  • Agricultural Chemicals And Associated Chemicals (AREA)
  • Nozzles (AREA)

Abstract

The invention refers to an apparatus for producing water saturated with air under high pressure and preferably intended for dispersion in flotation plants, which apparatus comprises a preferably standing cylindrical pressure vessel (21) which during operation to a controlled level is partly filled with pressurized water flowing through said vessel and out through an outlet in the lower part of the vessel and partly with continuously added compressed air, whereby during the passage of the water through the vessel (21) air is dissolved in the water. The supply of pressurized water to the apparatus is arranged at the upper part of the pressure vessel (21) by means of a spray-nozzle (24) or similar arrangement which splits the water flow. The spray-nozzle is so designed that at least part of the water flow sprays and essentially covers the inner walls, of the upper, during operation air filled portion, of the vessel (21) by means of a water curtain which portion is supplied with compressed air through a conduit (27) arranged in the wall of the vessel in this portion.

Description

APPARATUS FOR PRODUCING AIR SATURATED WATER
TECHNICAL FIELD
The present invention refers to an apparatus for producing water saturated with air under high pressure and preferably intended for dispersion in flotation plants, which appara¬ tus comprises a preferably standing cylindrical pressure vessel which during operation to a controlled level is partly filled with pressurized water flowing through said vessel and out through a bottom outlet and partly with con¬ tinuously added compressed air, whereby during the passage of the water through the vessel air is dissolved in the wa- ter.
PRIOR ART
When treating water, drinking water as well as sewage wa- ter, flotation plants are used to an increasing extent in order to increase the rate of flow of the water through the treatment plants and as a consequence of this also making it possible to decrease the size of the necessary basins and thereby the size of the complete treatment plants. When it comes to drinking water the requirements on the finished product are mainly uniform and the design of a treatment plant is mainly decided by the character of the source of water supply. If the source is a lake or a water course usually separation of larger particles is taking place in a filter chamber whereafter the water is subjected to a chemical and biological treatment carried out by means of the addition of precipitation- and flocculation- agents in a flocculation chamber. The particles which are precipi¬ tated are then to be separated from the water which can be done by means of sedimentation which means that the parti¬ cles through the influence from gravity sink to the bottom in a sedimentation basin. Different types of particles have different density and therefore different sinking velocity. In order to make it possible for particles having low den¬ sity, "light particles", to sediment while the water passes a sedimentation basin a long time is required which means that the surface of the sedimentation basin must be large.
The time for the particle separation could be considerably reduced by means of flotation which means that microscopic air bubbles are added to the water which adhere to parti¬ cles or particle flocculations in the water and also con¬ tribute in the process of creating particle flocculations and keeping them together. Air bubbles raise fast towards the water surface bringing adhered particles and particle flocculations to the water surface where they create a sta¬ ble sludge cover which can be removed by means of scrapers or by intermittently raising the water level in the flota¬ tion basin so that the sludge cover transfers to a sludge channel arranged at one of the edges of the basin.
The microscopic air bubbles which are used in the flotation procedure have a diameter of 30-80 micrometer and can not be generated for instance by means of the injection of air directly in the water. Microscopic air bubbles for flota- tion of drinking water are usually generated by means of dissolving air in clean water in a pressured vessel under overpressure whereby the biggest possible saturation level is aimed at. This water which usually is called dispersion water is fed with maintained high pressure to the inlet for the flocculated water in the flotation basin positioned at its bottom where it is added to said water via special noz¬ zles or sprayers which are designed to give an instantane¬ ous decrease in the pressure at which the air dissolved in the water is released in the form of microscopic bubbles creating a dispersion of air in the water. The pressure vessels which are used for the generation of high pressure dispersion water, saturated with air to the greatest possible extent, are usually kept half filled with water by means of a control unit including sensors and the in- and outlets for the water are positioned below the wa¬ ter surface in the pressured vessel. The addition of com¬ pressed air takes place in the space filled with air above the water surface and the vessel is rather big in order to make the contact surface between air and water large. In another known embodiment the pressure vessel which often is as tall as a man has a reduced diameter and the conse¬ quently reduced contact surface between the water and air has been compensated by the feeding of the water through a nozzle arranged in the side wall of the vessel in the air filled space through which nozzle the water is spraying against the opposite wall of the vessel where the water jet to some extent is splitted up.
The flotation method has considerably decreased the time for water treatment and the decreased time of flow means that water treatment plants could be made smaller keeping the same capacity. When the space requirement of the treat¬ ment plants decreases new application fields are opened. Such a development requires that all the devices are made smaller and if possible are given improved characteristics. This also goes for the apparatus for producing dispersion water in which already treated, recirculated, water is used. An increase of the saturation level in the dispersion water decreases the need of recirculated water whereby the efficiency of the whole treatment plant is improved.
DESCRIPTION OF THE INVENTION
One object of the present invention is to propose an appa- ratus for producing dispersion water having a high degree of air saturation. Another object is to propose an appara- tus which combines high capacity with small dimensions. This is attained by means of an apparatus having the char¬ acteristics according to the appended claims.
DESCRIPTION OF THE DRAWINGS
One embodiment of the invention will be described more in detail with reference to the enclosed drawing on which fig¬ ure 1 in a side view and schematically shows a convention- ally equipped flotation basin in section and figure 2 shows partly in section an apparatus according to the invention for producing dispersion water.
In figure 1 which schematically and in a side view shows a conventionally equipped flotation basin in section the ba¬ sin is generally designated 1. The basin has an inlet 2 to which water is fed from a flocculation chamber, not shown. By means of an inclined barrier 3 arranged in front of the inlet 2 in the basin 1 the water is caused to flow upwards in the basin 1. At the bottom of the pocket which is cre¬ ated between the wall 4 of the basin and the barrier 3 a set of tubes provided with nozzles or sprayers debouch, one tube 6 of which is shown in the figure. The tubes 6 feed air saturated water, dispersion water, to the flocculated water fed to the basin through the inlet 2 which water is given an increased movement by the dispersion water in¬ jected under pressure. The nozzles or sprayers 5 are so de¬ signed that the dispersion water is subjected to an instan¬ taneous pressure decrease which releases the air in that water in the form of microscopic bubbles which in their movement towards the water surface adhere particles and particle flocculations and relatively fast carry most of these particles to the water surface where a sludge cover is created which by means of some kind of sludge scraper 7 or in another way is transferred to the sludge channel 8 at the wall 9 of the basin. Heavy particles which the Micro bubbles are not able to lift are collected by the filter 10 which is arranged between the back side of the barrier 3 and the wall 9 of the basin and through which filter the treated water passes on its way via the outlet 11 to a clear water basin, not shown. From this basin part of the treated water is pumped, under high pressure, to the water inlet 13 of the pressure vessel 12. The vessel 12 in which the dispersion water is produced is provided with com¬ pressed air via the air inlet 14 from a compressor, not shown, and the air saturated water is fed back via the out¬ let 15 and its branchings 6 to the nozzles 5 arranged in the flotation basin 1.
In figure 2 an apparatus according to the invention is shown, schematically and partly in section, for producing dispersion water. The apparatus comprises a vertical pres¬ sure vessel 21 which is implemented by means of commer¬ cially available tube parts and has the form of an enlarge¬ ment on a conduit 22, 23. The inlet tube 22 debouch into a spray-nozzle 24 which has the form of a prolongation of the inlet tube 22, closed at its free end. The envelope surface of the prolongation tube 24 is completely perforated by means of small spray holes 25 only a smaller number of which are shown in figure 2. During operation the pressure vessel 21 is halfway filled with water and two detectors arranged in the wall of the vessel deliver signals to a control unit, not shown, which if necessary decreases or increases the water flow into the vessel alternatively ad¬ justs the air pressure in the pressured vessel 21. The feeding of compressed air is carried out via the conduit 27 and is controlled by means of a magnet valve 28 arranged on said conduit. During operation water is spraying, as indi¬ cated in figure 2 with a couple of dashed arrows, from the spray-nozzle 24 against the inner wall of the pressured vessel which will be covered by a curtain of water which continuously is provided with new water whereby the air ab- sorbing ability of the curtain all the time is kept at the maximum level.
Due to the considerable improvement in the air absorbing ability of the apparatus according to the invention com¬ pared to known apparatuses it has been possible to reduce its dimensions to a great extent. Thus, a conventional ap¬ paratus having a height of close to 2 meters and a diameter of 35 cm has been possible to replace with an apparatus having a height of approximately 1 meter and a diameter of 10 cm.
Due to this reduction of the dimensions conventional, spe¬ cially made pressure vessels have for certain purposes been possible to replace with a 4" tube having reduction cou¬ plings as end portions and e.g. an inlet conduit of 1" and an outlet conduit of 2".

Claims

1. Apparatus for producing water saturated with air under high pressure and preferably intended for dispersion in flotation plants, which apparatus comprises a preferably standing cylindrical pressure vessel (21) which during op¬ eration to a controlled level is partly filled with pres¬ surized water flowing through said vessel and out through an outlet in the lower part of the vessel and partly with continuously added compressed air, whereby during the pas¬ sage of the water through the vessel (21) air is dissolved in the water, characterised in that the supply of pressur¬ ized water is arranged at the upper part of the pressure vessel (21) by means of a spray-nozzle (24) or similar ar¬ rangement which splits the water flow and is so designed that at least part of the water flow sprays and essentially covers the inner walls, of the upper, during operation air filled portion, of the vessel (21) by means of a water cur- tain which portion is supplied with compressed air through a conduit (27) arranged in the wall of the vessel in this portion.
PCT/SE1996/000050 1995-01-19 1996-01-19 Apparatus for producing air saturated water WO1996022250A1 (en)

Priority Applications (4)

Application Number Priority Date Filing Date Title
EP96901179A EP0789672B1 (en) 1995-01-19 1996-01-19 Method and apparatus for producing air saturated water
AT96901179T ATE200272T1 (en) 1995-01-19 1996-01-19 METHOD AND APPARATUS FOR PRODUCING AIR SATURATED WATER
AU44999/96A AU4499996A (en) 1995-01-19 1996-01-19 Apparatus for producing air saturated water
DE69612366T DE69612366T2 (en) 1995-01-19 1996-01-19 METHOD AND DEVICE FOR PRODUCING WATER SATURED WITH AIR

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
SE9500215-0 1995-01-19
SE9500215A SE503895C2 (en) 1995-01-19 1995-01-19 Aggregates for the production of air saturated water

Publications (1)

Publication Number Publication Date
WO1996022250A1 true WO1996022250A1 (en) 1996-07-25

Family

ID=20396916

Family Applications (2)

Application Number Title Priority Date Filing Date
PCT/SE1996/000040 WO1996022248A1 (en) 1995-01-19 1996-01-18 Apparatus for producing air-saturated water
PCT/SE1996/000050 WO1996022250A1 (en) 1995-01-19 1996-01-19 Apparatus for producing air saturated water

Family Applications Before (1)

Application Number Title Priority Date Filing Date
PCT/SE1996/000040 WO1996022248A1 (en) 1995-01-19 1996-01-18 Apparatus for producing air-saturated water

Country Status (9)

Country Link
US (1) US5989437A (en)
EP (1) EP0789672B1 (en)
CN (1) CN1119285C (en)
AT (1) ATE200272T1 (en)
AU (2) AU4592796A (en)
DE (1) DE69612366T2 (en)
PL (1) PL182306B1 (en)
SE (1) SE503895C2 (en)
WO (2) WO1996022248A1 (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1293254A2 (en) * 2001-09-17 2003-03-19 Andritz AG Method and device for aerating a liquid with a gas
FR2941384A1 (en) * 2009-01-29 2010-07-30 Kwi Internat Environmental Tre Gas dissolving device i.e. air reactor, for clarifying water in industrial effluent treatment field, has maintaining unit to maintain liquid/gas interface inside reservoir at level so as to create gas pocket in upper part of reservoir

Families Citing this family (18)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6168141B1 (en) * 1999-03-22 2001-01-02 Artur G. Zimmer Apparatus for treatment of fluent materials
SE523106C2 (en) * 2002-06-06 2004-03-30 Tetra Laval Holdings & Finance Device at an infuser for a liquid food product
DE10228261B3 (en) * 2002-06-25 2004-02-26 Bayer Ag Device for gas saturation of a liquid and under pressure for introducing the liquid into a flotation cell
US20050279684A1 (en) * 2004-06-21 2005-12-22 Maxwell Hsu Water flow rate self-tuning device for pressurized gas-water mixer
US20050279687A1 (en) * 2004-06-21 2005-12-22 Maxwell Hsu Pressurized gas-water mixing device
US20100012049A1 (en) * 2006-04-12 2010-01-21 Jms Co., Ltd Cavitation heating system and method
EP1854764B1 (en) * 2006-05-10 2016-12-14 Grundfos Management A/S Reactor comprising a stack of filter plates
US20110110181A1 (en) * 2009-04-23 2011-05-12 Peter Douglas Jack Method and apparatus for mixing and/or blending fluids
BRPI0903291A2 (en) 2009-09-02 2011-05-10 Evonik Degussa Brasil Ltda process for purifying water flowing in a river or canal
US9233855B2 (en) * 2009-09-07 2016-01-12 Aerofloat (Holdings) Pty Ltd Apparatus and method for the treatment of water
CN104776413B (en) 2014-01-10 2017-12-01 台州市大江实业有限公司 System occurs for a kind of steam power
CN104776415B (en) * 2014-01-10 2017-01-04 台州市大江实业有限公司 Saturated water generating device
CN104776414B (en) 2014-01-10 2017-02-08 台州市大江实业有限公司 Steam power generation system and method
CN107001074A (en) * 2014-10-02 2017-08-01 威立雅水务技术支持公司 The water treatment procedure of suspended solid is removed using dissolved air floatation
CN105880035B (en) * 2016-04-11 2017-11-07 安徽理工大学 It is a kind of possess from size mixing and self-defoaming function ore pulp driving stirring-type floatation equipment
CN107261967A (en) * 2017-08-12 2017-10-20 张维国 A kind of dissolved air water Drinking fountain
CN109900622B (en) * 2019-03-25 2021-09-28 山西大学 Powder mineral floatability analyzer
CN110339740A (en) * 2019-06-18 2019-10-18 西安航天动力试验技术研究所 A kind of pouring-in pipe-line mixer of more materials

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2190853A (en) * 1984-04-25 1987-12-02 Int Distillers & Vintners Limi Apparatus for dissolving gas in liquids

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1646019A (en) * 1925-07-29 1927-10-18 Forrester David Lawton Flotation method and apparatus
US3175687A (en) * 1962-09-24 1965-03-30 Komline Sanderson Eng Corp Flotation unit
US3243046A (en) * 1962-12-01 1966-03-29 Ebara Infilco Floatation apparatus
FR1515865A (en) * 1966-06-14 1968-03-08 Saint Gobain Techn Nouvelles Improvements in the separation of a liquid and an immiscible solid or liquid in suspension
SE404177B (en) * 1977-01-17 1978-09-25 Flootek Vattenrening Ab WAY AND DEVICE TO CONTROL FLOATING DEVICE
US5543089A (en) * 1993-01-28 1996-08-06 Pichardo; Antonio C. Device for aeration of polluted water
US5484534A (en) * 1994-07-08 1996-01-16 Edmondson; Jerry M. Energy conserving method of water treatment

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2190853A (en) * 1984-04-25 1987-12-02 Int Distillers & Vintners Limi Apparatus for dissolving gas in liquids

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1293254A2 (en) * 2001-09-17 2003-03-19 Andritz AG Method and device for aerating a liquid with a gas
EP1293254A3 (en) * 2001-09-17 2004-02-18 Andritz AG Method and device for aerating a liquid with a gas
FR2941384A1 (en) * 2009-01-29 2010-07-30 Kwi Internat Environmental Tre Gas dissolving device i.e. air reactor, for clarifying water in industrial effluent treatment field, has maintaining unit to maintain liquid/gas interface inside reservoir at level so as to create gas pocket in upper part of reservoir

Also Published As

Publication number Publication date
EP0789672B1 (en) 2001-04-04
DE69612366T2 (en) 2001-10-18
DE69612366D1 (en) 2001-05-10
EP0789672A1 (en) 1997-08-20
AU4592796A (en) 1996-08-07
WO1996022248A1 (en) 1996-07-25
SE9500215L (en) 1996-07-20
SE9500215D0 (en) 1995-01-19
CN1183754A (en) 1998-06-03
PL182306B1 (en) 2001-12-31
PL321465A1 (en) 1997-12-08
US5989437A (en) 1999-11-23
AU4499996A (en) 1996-08-07
ATE200272T1 (en) 2001-04-15
SE503895C2 (en) 1996-09-30
CN1119285C (en) 2003-08-27

Similar Documents

Publication Publication Date Title
WO1996022250A1 (en) Apparatus for producing air saturated water
EP0871590B1 (en) Apparatus for distribution and dispersion of air saturated water
US4278546A (en) Treatment of a liquid by circulation and gas contacting
KR100239630B1 (en) Improved apparatus and method for deinking waste paper pulp
US5641397A (en) Device for separating inorganic material polluted by organic material from a fluid
CA2635663A1 (en) Method, system and apparatus for concentrating solids from drilling slurry
PL160297B1 (en) Method for phase separation by foam flotation and a foam flotation unit
RO114419B1 (en) Particle separating device with fluid circulation having double extraction effect and device for biological purification of a liquid by using such a particle separator
US20210178293A1 (en) Rake-free thickening device including driving area
US3399775A (en) Sewage treatment apparatus-grit washer-ejector
WO1998031634A1 (en) Method and apparatus for purifying a liquid by means of flotation
EP1143066A3 (en) Device for degassing fibrous suspension
US5980613A (en) Pressurized radon stripper
SU1033204A1 (en) Suspension distributor
RU2102155C1 (en) Floatation column
RU2595680C2 (en) Floatation plant for purifying waste water
RU2187381C1 (en) Aerator
DE4446888C2 (en) Device for the wet mechanical treatment of contaminated, granular materials and their slurries
SU1194850A1 (en) Waste water purification plant
RU2297978C1 (en) Installation for floatation purification of the waste waters
SU1624298A1 (en) Method and device for producing homogeneous liquid flow
SU1005920A1 (en) Flotation machine
SU1599104A1 (en) Illuminating unit
SU753470A1 (en) Apparatus for conditioning flotation pulp
RU2058192C1 (en) Column type flotation machine

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): AU BB BG BR BY CA CN CZ FI HU JP KP KR KZ LK MG MN MW NO NZ PL RO RU SD SK UA US VN

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FR GB GR IE IT LU MC NL PT SE BF BJ CF CG CI CM GA GN ML MR NE SN TD TG

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
WWE Wipo information: entry into national phase

Ref document number: 1996901179

Country of ref document: EP

WWP Wipo information: published in national office

Ref document number: 1996901179

Country of ref document: EP

WWG Wipo information: grant in national office

Ref document number: 1996901179

Country of ref document: EP