EP0546335A1 - Dispositif pour introduire du gaz dans des fluides - Google Patents

Dispositif pour introduire du gaz dans des fluides Download PDF

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Publication number
EP0546335A1
EP0546335A1 EP92119237A EP92119237A EP0546335A1 EP 0546335 A1 EP0546335 A1 EP 0546335A1 EP 92119237 A EP92119237 A EP 92119237A EP 92119237 A EP92119237 A EP 92119237A EP 0546335 A1 EP0546335 A1 EP 0546335A1
Authority
EP
European Patent Office
Prior art keywords
wall
base body
gas
gas supply
liquid
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
EP92119237A
Other languages
German (de)
English (en)
Other versions
EP0546335B1 (fr
Inventor
Karl-Heinz SCHÜSSLER
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
Priority claimed from US07/807,012 external-priority patent/US5183595A/en
Application filed by Individual filed Critical Individual
Publication of EP0546335A1 publication Critical patent/EP0546335A1/fr
Application granted granted Critical
Publication of EP0546335B1 publication Critical patent/EP0546335B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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
    • 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
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23124—Diffusers consisting of flexible porous or perforated material, e.g. fabric
    • B01F23/231241—Diffusers consisting of flexible porous or perforated material, e.g. fabric the outlets being in the form of perforations
    • 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
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23124—Diffusers consisting of flexible porous or perforated material, e.g. fabric
    • 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
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23123—Diffusers consisting of rigid porous or perforated material
    • B01F23/231231—Diffusers consisting of rigid porous or perforated material the outlets being in the form of perforations
    • 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
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23124—Diffusers consisting of flexible porous or perforated material, e.g. fabric
    • B01F23/231245—Fabric in the form of woven, knitted, braided, non-woven or flocculated fibers or filaments
    • 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
    • B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
    • B01F23/23105—Arrangement or manipulation of the gas bubbling devices
    • B01F23/2312—Diffusers
    • B01F23/23126—Diffusers characterised by the shape of the diffuser element
    • B01F23/231265—Diffusers characterised by the shape of the diffuser element being tubes, tubular elements, cylindrical elements or set of tubes

Definitions

  • the invention relates to a device for gassing liquids, in particular for aerating waste water, by means of a gas distributor which can be arranged below the liquid level and can be connected to a gas supply device and which has at least one membrane-like wall made of flexible material with a large number of gas outlet openings.
  • the wall is designed as a support-free bladder, which is held only via a gas supply nozzle, except for a gas supply opening and the gas outlet openings.
  • the gas distributor only consists of the bladder and has neither an inner nor an outer support structure.
  • the gas bubbles rise relatively quickly to the liquid level after exiting the bubble and accordingly only a reduced fumigation of the liquid is brought about.
  • an air hose consisting of elastic material, connected at one end to an air supply line and closed at the other end with an unperforated underside and with a plurality of air outlet openings is provided, the air hose being on its Longitudinal edges held by a support member and a membrane under the tension of an air cushion is arranged in the air hose, which forms the lower boundary of an air duct connected to the air supply line.
  • the two tube walls are connected to one another at the two longitudinal edges by a weld seam and each form a loop which encloses one of the two strand-shaped support members.
  • the membrane which is under the tension of an air cushion, is also welded to the two tube walls on its two side edges.
  • the air hose is also supported on its two side edges by a sheet steel profile, which covers the weld seams and is intended to prevent their peeling.
  • the sheet steel profile is intended to increase the rigidity and weight of the air hose; it can also be provided on the underside of the air hose, the weight expediently being somewhat larger than the buoyancy of the hose filled with air.
  • This known ventilation device is structurally complex and therefore expensive.
  • a base body which has at least one inlet for the gas.
  • the membrane covers the base body and is attached to it.
  • a device for limiting the stroke of the membrane is also attached to the base body.
  • the inlet for the gas is passed through the base body as a passage opening.
  • the limiting device consists of a connection which is fastened to the membrane at one end in the area of overlap of the passage opening and cooperates with its other end with a counterpart arranged in the area of the passage opening.
  • the object of the invention is therefore to avoid the disadvantages mentioned to create a generic gassing device by means of which better ventilation of the liquid can be achieved with simple manufacture.
  • the gas distributor has a base body around which the wall is arranged essentially cylindrically with a substantially vertical central axis and a e.g. annular chamber bounded in the base body, which is connected to at least one gas supply channel and encloses at least one liquid channel which is guided essentially vertically through the base body.
  • the gas thus exits in the horizontal direction over the entire cylindrical outer surface of the membrane-like wall, so that the residence time of the gas bubbles in the liquid is increased and the ventilation effect is thereby improved compared to gas bubbles which emerge from an upwardly inclined or horizontally lying surface.
  • the base gives the gas distributor the necessary stability, while the at least one liquid channel inside an increased, downward flow of liquid is achieved in the base body. The reason for this phenomenon seems to be that the liquid around the membrane-like cylindrical wall has a higher concentration of gas bubbles than the liquid located further in the area of the liquid channel. As a result, the specific weight of the liquid around the gas distributor is less than that of the liquid in the region of the liquid channel, so that the liquid rises around the gas distributor while a downward flow occurs in the liquid channel of the gas distributor.
  • the gas outlet openings are distributed essentially over the entire surface of the wall, preferably uniformly, in order to ensure a uniform supply of gas into the liquid.
  • the wall consists of a flexible cylindrical piece of hose, which is connected at its two axial ends to the preferably also cylindrical base body.
  • the at least one liquid channel is delimited by a hose element which leads through the chamber and is fastened to the base body.
  • the basic body can have a very simple basic shape.
  • the hose element expediently has less flexibility than the wall.
  • the wall expands when pressure is applied, while the hose element inside the gas distributor remains stiff and a reduction in the cross section of the liquid channel is avoided.
  • the at least one liquid channel is made in one piece, e.g. is designed as a bore in the base body.
  • the at least one liquid channel runs parallel to the cylindrical wall, i.e. vertical.
  • a single liquid channel runs coaxially with the tube piece forming the wall.
  • a symmetrical flow profile of the downward directed liquid flow in the middle of the gas distributor is thereby achieved.
  • the gas supply channel is arranged coaxially with the base body.
  • the effective opening cross section of the gas outlet openings is different in size in adaptation to the liquid pressure to be overcome by the gas emerging through the gas outlet openings.
  • the opening cross section of the gas outlet openings in the bubble wall decreases from the bottom to the top as the liquid pressure decreases from the bottom to the top depending on the vertical height of the bubble.
  • a uniform gas outlet can also be promoted in that the wall has different thicknesses in adaptation to the liquid pressure to be overcome by the gas emerging through the gas outlet openings.
  • the wall in the lower area has a smaller thickness than in the upper area, so that the gas passage through the gas outlet openings in the lower area of the wall is opposed to a lower flow resistance than in the upper wall area, so that the gas to be overcome as a whole must be overcome Pressure is about the same.
  • the wall can be made of a stretchable, for example rubber-elastic material, which bulges outwards under the pressurization required for the gassing and thereby increases the effective area of the gas distributor.
  • the wall may consist of a non-stretchable, for example textile material.
  • the size and shape of the wall are fixed independently of the pressure above a minimum pressure of the gas supply.
  • the textile material allows a certain stretch, to combine the properties of a stretchable with those of a non-stretchable material.
  • This can be achieved in particular in that the wall consists of textile material or a textile reinforcement insert or pad having.
  • the gas outlet openings are made in the prestressed wall made of stretchable material.
  • the gas outlet openings are closed without pressurizing the chamber, while they only open when the fumigation gas is at a minimum pressure.
  • the opening cross-section of the gas outlet openings is pressure-dependent and can be adjusted accordingly.
  • gas outlet openings block one from the inside out, i.e. have a radially increasing opening cross-section, i.e. are conical. This has the advantage that when the gas exits the wall, any dirt deposits are easily entrained from the gas outlet openings, thereby reducing the risk of blockages even of relatively small gas outlet openings.
  • gas outlet openings are introduced into the wall from the outside, for example in the form of perforation by means of pinholes.
  • the gas is transported from the gas supply channel to the chamber with the wall by at least one connecting channel, which preferably runs radially in the base body, e.g. from the central gas supply duct to the outer surface of the base body.
  • a uniform pressurization of the entire wall is ensured in that an annular groove is formed on the outer surface of the base body, into which the connecting channel opens and which is covered by the wall.
  • a tubular, flexible, membrane-like wall element is provided in the upper region of the base body, which is arranged offset radially inwards with respect to the wall and forms the chamber therewith.
  • the wall element can have a multiplicity of gas outlet openings. As a result, the liquid flow flowing downwards inside the gas distributor can also be aerated.
  • the gas supply channel has an internal thread with which the gas distributor can be screwed onto a pipe socket of the gas supply device provided with a corresponding external thread.
  • the gas supply channel is formed, for example, in a gas supply nozzle provided on the base body.
  • the gas distributor it is also possible for the gas distributor to be slipped onto a pipe socket of the gas supply device by means of the gas supply nozzle. Such a gas distributor can easily be replaced if it is defective.
  • the gas supply connection can be fastened to the pipe connection by means of a clamp, so that larger pressurizations can also be handled.
  • the gas distributor has a gas supply nozzle with a bead, which can be connected to a gas supply opening of the gas supply device. This also allows a relatively easy assembly and disassembly of the gas distributor.
  • a e.g. Check valve designed as a flap or ball valve, which prevents the liquid from penetrating into the pipe socket or the piping system of the gas supply device when the pressure drops.
  • the invention also proposes that a ballast weight be arranged in the base body, in particular the chamber.
  • the ballast weight can be formed as a hollow body made of rigid or flexible material, the interior of which is in flow communication with the liquid surrounding the gas distributor and / or can be filled with a liquid such as water, concrete, lead or the like as a ballast weight.
  • the ballast weight can also be arranged outside the gas distributor.
  • the base body itself can be designed as a ballast weight.
  • a device according to the invention for the gassing of liquids consists of a gas distributor 1 to be arranged under the liquid level, which can be connected to a gas supply device 2.
  • the gas distributor 1 shown in FIG. 1 consists of a base body 3, in which a chamber 4 and a gas supply channel 5 are formed. An internal thread is provided in the gas supply duct 5, so that the gas distributor 1 can be screwed onto a pipe socket of the gas supply device 2 provided with an external thread.
  • the base body 3 is cylindrical and carries a cylindrical wall 6 made of flexible, membrane-like material, in which a multiplicity of gas outlet openings 7 are formed (cf. FIGS. 9 and 10).
  • the wall 6 is fastened at its axial ends to the outside of the base body 3, for example with clips 8. If air is introduced into the chamber 4 through the gas supply duct 5, the wall 6 widens, as illustrated by the broken line.
  • a liquid channel 9 extends essentially vertically through the base body 3 and is formed by a hose element 10 connected to the base body 3 at its upper and lower ends.
  • the hose element 10 can consist of solid or flexible material.
  • the flexibility of the hose element 10 is less than the flexibility of the wall 6, so that the wall 6 inflates outwards when pressure is applied, while the hose element 10 remains stiff.
  • the gas distributor 1 When the gas distributor 1 is pressurized, air escapes through the gas outlet openings 7 in the wall 6 essentially in the horizontal direction. As a result, the gas bubbles remain in the liquid for a relatively long time.
  • a liquid flow F directed downward occurs in the liquid channel 9, as indicated by the downward arrow in FIG. 1.
  • the liquid flow F seems to be due to the fact that the liquid around the membrane-like cylindrical wall 6 has a higher concentration of gas bubbles than the liquid inside the liquid channel 9.
  • the specific weight of the gas-laden liquid around the gas distributor 1 is less on average than that of the liquid in the inner liquid channel 9. This leads to a rise of the liquid around the gas distributor 1, while the liquid flows in the middle of the gas distributor 1 from top to bottom. This results in increased circulation and consequently better ventilation of the liquid.
  • the ascending bubble flow increases upwards as the gas flows out over the entire circumference of the jacket 6. This phenomenon is in contrast to gas distributors, in the middle of which no liquid channel is formed. With such gas distributors, the area of the rising gas bubbles decreases upwards. In this way, too, better liquid ventilation is achieved with the device according to the invention.
  • the embodiment according to FIG. 2 differs from that shown in FIG. 1 essentially in that a plurality of liquid channels 9 are formed in the base body 3.
  • the gas supply channel 5 in the embodiment according to FIG. 2 is also coaxial with the base body 3 and leads directly into the center of the chamber 4.
  • a downward-directed liquid flow F is caused in each of the liquid channels 9.
  • the wall 6 lies essentially directly on the outside of the base body 3 when the gas distributor 1 is not pressurized.
  • the chamber volume is then practically zero.
  • a small recess for the chamber 4 can also be provided. If the wall 6 is extended outwards when pressure is applied, the chamber 4 is enlarged.
  • the gas supply channel 5 is arranged coaxially with the base body 3 and is connected to the chamber 4 via a plurality of radial connecting channels 11.
  • the connecting channels 11 are arranged in ribs 12 of the base body 3, which form a plurality of liquid channels 9 in an upper section 3 ′ of the base body 3.
  • the air L enters the gas supply channel 5 from below, as illustrated by the arrow in FIG.
  • FIGS. 5 and 6 The embodiment shown in FIGS. 5 and 6 is similar to the embodiment according to FIGS. 3 and 4.
  • an outer circumferential annular groove 13 covered by the wall 6 is formed in the base body 3, into which the connecting channels 11 open.
  • the groove 13 ensures that the air or gas is guided over the entire circumference of the body 3 into the chamber 4 and to the inner surface of the wall 6.
  • the air or the gas at least at the beginning, is introduced into the chamber 4 at only two points which correspond to the outer ends of the connecting channels 11.
  • the wall 6 should therefore have no gas outlet openings 7 in the area around the mouths of the connecting channels 11 into the chamber 4. Good gas distribution in chamber 4 is thereby achieved.
  • the upper region 3 'of the base body 3 consists of rigid material, in the embodiment according to FIGS. 7 and 8 this rigid section 3' of the base body 3 is replaced by a tubular, flexible, membrane-like wall element 14 , which has a plurality of gas passage openings.
  • the lower end of the wall element 14 is fastened to the base body 3, while the upper end of the wall element 14 is held on a clamping element 15, for example via the clamps 8.
  • the clamping element 15 can be a section of the base body 3 or can be connected to it. If gas is now introduced into the chamber 4 via the connecting channels 11, the wall 6 will first expand outwards according to the dashed line. Thereafter, the wall element 14, as illustrated by the dash-dotted line, will expand inwards. By expanding the wall element 14 inwards into the liquid channel 9, the downward-directed liquid flow in the liquid channel 9 is additionally reinforced.
  • the groove 13 can also be formed in the base body 3.
  • FIGS. 9 and 10 differ from the above. essentially by a different type of attachment of the gas distributor 1 to the gas supply device 2.
  • the gas supply device 2 has a pipeline 16, from which one or more pipe sockets 17 branch off at a gas supply opening 18.
  • a gas supply connection 19 is provided on the gas distributor 1, in which the gas supply channel 5 is formed.
  • the gas supply nozzle 19 is placed over the pipe socket 17 and can be fixed by means of a clamp 20. So that the gas distributor 1 is securely attached to the gas supply device 2.
  • a check valve 21 which is designed as a ball valve and which opens when the gas pressure is applied and closes when the pressure drops, so that no liquid can get into the gas distributor 1 and the gas supply device 2 via the gas outlet openings 7 before the opening of the gas supply channel 5.
  • the embodiment according to FIG. 10 differs from that shown in FIG. 9 essentially in that the gas supply connection 19 is designed as a bead 22 which can be buttoned into the gas supply opening 18 of the pipeline 16.
EP92119237A 1991-12-09 1992-11-11 Dispositif pour introduire du gaz dans des fluides Expired - Lifetime EP0546335B1 (fr)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
US807012 1991-12-09
US07/807,012 US5183595A (en) 1990-04-20 1991-12-09 Device for gassing liquids
DE9207094U 1992-05-26
DE9207094U DE9207094U1 (fr) 1991-12-09 1992-05-26

Publications (2)

Publication Number Publication Date
EP0546335A1 true EP0546335A1 (fr) 1993-06-16
EP0546335B1 EP0546335B1 (fr) 1996-02-14

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Family Applications (1)

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EP92119237A Expired - Lifetime EP0546335B1 (fr) 1991-12-09 1992-11-11 Dispositif pour introduire du gaz dans des fluides

Country Status (3)

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EP (1) EP0546335B1 (fr)
DE (2) DE9207094U1 (fr)
DK (1) DK0546335T3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001045869A2 (fr) * 1999-12-22 2001-06-28 K-V Associates, Inc. Diffuseur microporeux stratifie

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE9302498U1 (fr) * 1993-02-20 1993-04-22 Schuessler, Karl-Heinz, 6380 Bad Homburg, De
US5855775A (en) 1995-05-05 1999-01-05 Kerfoot; William B. Microporous diffusion apparatus
USRE43350E1 (en) 1995-05-05 2012-05-08 Think Village-Kerfoot, Llc Microporous diffusion apparatus
US6582611B1 (en) 2000-07-06 2003-06-24 William B. Kerfoot Groundwater and subsurface remediation
US8557110B2 (en) 2000-07-06 2013-10-15 Thinkvillage-Kerfoot, Llc Groundwater and subsurface remediation
US8302939B2 (en) 2003-02-12 2012-11-06 Thinkvillage-Kerfoot, Llc Soil and water remediation system and method
US7666316B2 (en) 2004-07-20 2010-02-23 Thinkvillage-Kerfoot, Llc Permanganate-coated ozone for groundwater and soil treatment with in-situ oxidation
US6913251B2 (en) 2003-02-12 2005-07-05 William B. Kerfoot Deep well sparging
US7442313B2 (en) 2003-08-27 2008-10-28 Thinkvillage-Kerfoot, Llc Environmental remediation method and system
US7401767B2 (en) 2003-12-24 2008-07-22 Kerfoot William B Directional microporous diffuser and directional sparging
US8771507B2 (en) 2003-12-24 2014-07-08 Thinkvillage-Kerfoot, Llc Directional microporous diffuser and directional sparging
US7651611B2 (en) 2006-07-12 2010-01-26 Thinkvillage-Kerfoot, Llc Directional microporous diffuser and directional sparging

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1162170A (fr) * 1956-08-03 1958-09-09 Electro Chimie Soc D Dispositif de mélange ou de fine dispersion d'un fluide dans un liquide
GB928628A (en) * 1961-10-12 1963-06-12 L Von Roll Ag Improvements in or relating to aerators for purification plants
US4198359A (en) * 1976-07-26 1980-04-15 Todd John J Apparatus for gasification of liquids
GB1593262A (en) * 1977-09-21 1981-07-15 Babcock Waster Treatment Ltd Pressure reducing devices
EP0414472A2 (fr) * 1989-08-21 1991-02-27 Exxon Chemical Patents Inc. Procédé pour stripping des systèmes de liquides et système de distribution de gaz pour cela

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE507294C (de) * 1929-01-05 1931-01-05 Eugen G Stich Vorrichtung zum Belueften von Fluessigkeiten

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR1162170A (fr) * 1956-08-03 1958-09-09 Electro Chimie Soc D Dispositif de mélange ou de fine dispersion d'un fluide dans un liquide
GB928628A (en) * 1961-10-12 1963-06-12 L Von Roll Ag Improvements in or relating to aerators for purification plants
US4198359A (en) * 1976-07-26 1980-04-15 Todd John J Apparatus for gasification of liquids
GB1593262A (en) * 1977-09-21 1981-07-15 Babcock Waster Treatment Ltd Pressure reducing devices
EP0414472A2 (fr) * 1989-08-21 1991-02-27 Exxon Chemical Patents Inc. Procédé pour stripping des systèmes de liquides et système de distribution de gaz pour cela

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001045869A2 (fr) * 1999-12-22 2001-06-28 K-V Associates, Inc. Diffuseur microporeux stratifie
WO2001045869A3 (fr) * 1999-12-22 2002-01-31 Kv Assoc Inc Diffuseur microporeux stratifie
US6436285B1 (en) 1999-12-22 2002-08-20 William B. Kerfoot Laminated microporous diffuser
US6780329B2 (en) 1999-12-22 2004-08-24 William B. Kerfoot Treating an aquifer or soil formations
US6984329B2 (en) * 1999-12-22 2006-01-10 Kerfoot William B Coated microbubbles for treating an aquifer or soil formations

Also Published As

Publication number Publication date
EP0546335B1 (fr) 1996-02-14
DE59205352D1 (de) 1996-03-28
DK0546335T3 (da) 1996-06-17
DE9207094U1 (fr) 1992-07-30

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