USRE33812E - Diffuser for aeration basin - Google Patents

Diffuser for aeration basin Download PDF

Info

Publication number
USRE33812E
USRE33812E US07/564,316 US56431690A USRE33812E US RE33812 E USRE33812 E US RE33812E US 56431690 A US56431690 A US 56431690A US RE33812 E USRE33812 E US RE33812E
Authority
US
United States
Prior art keywords
membrane
diffuser
backing surface
gas
iadd
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.)
Expired - Lifetime
Application number
US07/564,316
Inventor
Norbert Schneider
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.)
Envirotech Corp
Original Assignee
Envirotech Corp
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 Envirotech Corp filed Critical Envirotech Corp
Application granted granted Critical
Publication of USRE33812E publication Critical patent/USRE33812E/en
Assigned to ENVIROTECH CORPORATION, A DE CORP., DBA EIMCO PROCESS EQUIPMENT COMPANY reassignment ENVIROTECH CORPORATION, A DE CORP., DBA EIMCO PROCESS EQUIPMENT COMPANY ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: SCHNEIDER TRAUTE, SCHNEIDER, NORBERT
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • 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
    • C02F3/20—Activated sludge processes using diffusers
    • C02F3/201—Perforated, resilient plastic diffusers, e.g. membranes, sheets, foils, tubes, hoses
    • 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
    • B01F23/23126—Diffusers characterised by the shape of the diffuser element
    • B01F23/231262—Diffusers characterised by the shape of the diffuser element having disc shape
    • 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
    • Y10T137/7722—Line condition change responsive valves
    • Y10T137/7837—Direct response valves [i.e., check valve type]
    • Y10T137/7879—Resilient material valve
    • Y10T137/7888—With valve member flexing about securement
    • Y10T137/789—Central mount

Definitions

  • This invention relates to a diffuser for introducing gas in the form of bubbles into liquid held in an aeration basin, and more particular to so-called "disc” type diffusers having a bubble generating member of generally disc shape.
  • Diffusers for aeration basins holding a bio-degradeable liquid such as sewage are typically mounted at regularly spaced intervals on a grid of piping covering the bottom of the aeration basin.
  • the piping delivers gas (usually air) under pressure to the diffusers, and each of the diffusers in turn generate relatively small bubbles in the liquid.
  • gas usually air
  • each of the diffusers in turn generate relatively small bubbles in the liquid.
  • air is delivered to the liquid in the basin in the form of small bubbles throughout the extent of the basin to enhance the transfer of oxygen to the liquid for faster oxidation treatment of the liquid.
  • Conventional "disc” type diffusers comprise a body member mounted on the piping and a disc of gas permeable ceramic material secured to the body member.
  • the body member has a gas inlet at the bottom thereof adapted to receive air under pressure from the piping and a generally circular open top in flow communication with the gas inlet.
  • the disc of ceramic material is fitted over the top of the body member in sealing relationship therewith.
  • a problem with the conventional "disc” type diffuser is that over time suspended solids in the liquid being treated tend to deposit on the ceramic disc and block the gas passages or pores in the disc. This blockage tends to reduce the flow rate of air through the disc thereby reducing the amount of oxygen delivered to the liquid for treating the liquid. In the extreme, this blockage stops all flow of gas through the ceramic disc, thus rendering the diffuser incapable of performing its intended purpose. In addition, with the ceramic disc completely blocked, the air pressure may become so great as to cause the disc to be blown off the body member, thus also rendering the diffuser incapable of performing its intended purpose. In addition, the latter occurence allows liquid to enter the piping system, which may damage it.
  • a diffuser having a bubble generation membrane which remains free of deposits of solids in the liquid being treated which could block the pores in the membrane; the provision of such a membrane which has pores therein which open only when air under pressure is delivered to the diffuser and close when air under pressure is not delivered to the diffuser for keeping suspended solids from entering the pores; and the provision of such a diffuser which has a check valve associated therewith for positively blocking flow of liquid into the piping.
  • the diffuser means of this invention comprises a body member having a backing surface and passaging in the body member extending from a gas inlet adapted to receive gas under pressure from a source thereof to an outlet at the backing surface for delivery of the gas under pressure thereto.
  • the diffuser further includes a flexible, gas permeable membrane covering the backing surface and secured generally along the periphery of the membrane to the body member in sealing relation, the membrane being adapted to distend and move away from the backing surface upon the delivery of gas under pressure to the diffuser, with the gas flowing through the distended portion of the membrane and into the liquid in the form of relatively small gas bubbles, and being adapted to collapse into engagement with the backing member when gas under pressure is not delivered to the diffuser.
  • the diffuser also has check valve means comprising a movable valve member on the membrane and a valve seat on the body member at said outlet, the movable valve member being moved away from the valve seat along with the membrane when air under pressure is delivered to the diffuser to open the check valve for allowing the gas to enter the space between the member and the backing surface, and the movable valve member being moved into seating relationship with the valve seat to close the check valve when gas under pressure is no longer delivered, for blocking flow of liquid into the passaging in the diffuser.
  • check valve means comprising a movable valve member on the membrane and a valve seat on the body member at said outlet, the movable valve member being moved away from the valve seat along with the membrane when air under pressure is delivered to the diffuser to open the check valve for allowing the gas to enter the space between the member and the backing surface, and the movable valve member being moved into seating relationship with the valve seat to close the check valve when gas under pressure is no longer delivered, for blocking flow of liquid into the passaging in the diffuser.
  • FIG. 1 is a vertical central section of a first embodiment of the diffuser means of this invention.
  • FIG. 2 is a vertical central section of a second embodiment of the diffuser means.
  • a first embodiment of the diffuser of this invention comprising a body member having a generally planar, disc-shaped backing surface 1, and a passaging 2 extending up from a lower gas inlet 3.
  • the gas inlet 3 is adapted to receive a connection or fitting from piping for delivery of gas (such as air or oxygen) under pressure from a source thereof.
  • a membrane 5 of gas permeable, elastic material is stretched under light tension over the backing surface.
  • the periphery of the membrane is secured to the rim of the body member in sealing relationship by hoop band 6.
  • the edges of the membrane may be provided with a thickened edge margin (not shown) engageable by the band.
  • the membrane material is an elastomeric material which does not react chemically with the liquid being treated and is resistant to the growth of micro organisms thereon.
  • the membrane has been perforated with a large number of relatively small slots or pores. With the membrane in an untensioned or slightly tensioned condition these slots are closed and thus block flow of either gas or liquid therethrough. However, when the membrane is distended (highly tensioned) upon the delivery of gas under pressure to the diffuser, the slots open into large pores for relatively high flow rates of gas therethrough.
  • check valve means is provided to positively block such flow of liquid.
  • the movable member of the check valve comprises a disc 9 in axial alignment with but of larger diameter than the mouth of the inlet in the backing surface 1, which serves as the valve seat of the check valve.
  • the disc 9 is secured to the membrane by means of a bolt 7 extending through the disc, and threaded ring 8 and nut 10.
  • stop means generally at a central portion of the membrane holds this portion of the membrane generally adjacent the backing surface of the body member when air under pressure is delivered to the diffuser.
  • the stop means includes interengageable means, such as the head of the bolt 7 and an abutment member 4 in the passaging 2 in the body member, enabling movement of the central portion of the membrane away from the backing surface within a predetermined range of distances.
  • the air causes the membrane to distend and move away from the backing surface to the extent allowed by the stop.
  • the pores or slots open thereby allowing the air to flow into the liquid in the form of small bubbles emanating over the entire surface of the distended portion of the membrane.
  • the membrane collapses into engagement with the backing surface and the pores or slots close to block flow of liquid into the diffuser.
  • the check valve thus provides positive blockage of liquid flow into the diffuser
  • FIG. 2 there is generally shown a second embodiment of the diffuser which is similar to the first except the numerous elements forming the movable valve member of the check valve and stop means or the membrane have been replaced by a single member 11 having a head integrally formed in the membrane.
  • the portion of the membrane beneath the movable valve member is the element engageable with the valve seat.

Landscapes

  • Chemical & Material Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Microbiology (AREA)
  • Organic Chemistry (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Accessories For Mixers (AREA)

Abstract

A diffuser for introducing gas in bubbles into liquid held in an aeration tank .[.comprising.]. .Iadd.having .Iaddend.a body member having a backing surface and passaging extending from a gas inlet to an outlet at the backing surface, and a flexible, gas permeable membrane covering the backing surface and secured at its periphery to the body member in sealing relationship thereto. The membrane is .[.adapted to distend.]. .Iadd.distendable .Iaddend.and .[.move.]. .Iadd.moves .Iaddend.away from the backing surface upon delivery of gas under pressure to diffuser, with the gas flowing through the distended portion of the membrane and into the liquid in the form of relatively small gas bubbles, and .[.adapted to collapse.]. .Iadd.collapses .Iaddend.into engagement with the backing surface when gas under pressure is not delivered to the difuser. A check valve .[.comprising.]. .Iadd.has .Iaddend.a movable valve member on the membrane and a valve seat on the backing surface enables flow of gas into the space between backing surface and the membrane, and blocks flow of liquid into the passaging in the body member.

Description

This application is a continuation of application Ser. No. 714,658, filed on Mar. 21, 1985, which is now abandoned.
BACKGROUND OF THE INVENTION
This invention relates to a diffuser for introducing gas in the form of bubbles into liquid held in an aeration basin, and more particular to so-called "disc" type diffusers having a bubble generating member of generally disc shape.
Diffusers for aeration basins holding a bio-degradeable liquid such as sewage are typically mounted at regularly spaced intervals on a grid of piping covering the bottom of the aeration basin. The piping delivers gas (usually air) under pressure to the diffusers, and each of the diffusers in turn generate relatively small bubbles in the liquid. Thus, air is delivered to the liquid in the basin in the form of small bubbles throughout the extent of the basin to enhance the transfer of oxygen to the liquid for faster oxidation treatment of the liquid.
Conventional "disc" type diffusers comprise a body member mounted on the piping and a disc of gas permeable ceramic material secured to the body member. The body member has a gas inlet at the bottom thereof adapted to receive air under pressure from the piping and a generally circular open top in flow communication with the gas inlet. The disc of ceramic material is fitted over the top of the body member in sealing relationship therewith. When air pressure is delivered to the diffuser, it flows into the inlet, up toward the top of the body member and out through the gas permeable ceramic disc into the sewage in the form of bubbles. Flow of liquid back down into the diffuser, when air under pressure is not being delivered, is blocked by the ceramic disc which is impermeable to the flow of liquid therethrough.
A problem with the conventional "disc" type diffuser is that over time suspended solids in the liquid being treated tend to deposit on the ceramic disc and block the gas passages or pores in the disc. This blockage tends to reduce the flow rate of air through the disc thereby reducing the amount of oxygen delivered to the liquid for treating the liquid. In the extreme, this blockage stops all flow of gas through the ceramic disc, thus rendering the diffuser incapable of performing its intended purpose. In addition, with the ceramic disc completely blocked, the air pressure may become so great as to cause the disc to be blown off the body member, thus also rendering the diffuser incapable of performing its intended purpose. In addition, the latter occurence allows liquid to enter the piping system, which may damage it.
SUMMARY OF THE INVENTION
Among the several objects of this invention may be noted the provision of a diffuser having a bubble generation membrane which remains free of deposits of solids in the liquid being treated which could block the pores in the membrane; the provision of such a membrane which has pores therein which open only when air under pressure is delivered to the diffuser and close when air under pressure is not delivered to the diffuser for keeping suspended solids from entering the pores; and the provision of such a diffuser which has a check valve associated therewith for positively blocking flow of liquid into the piping.
The diffuser means of this invention comprises a body member having a backing surface and passaging in the body member extending from a gas inlet adapted to receive gas under pressure from a source thereof to an outlet at the backing surface for delivery of the gas under pressure thereto. The diffuser further includes a flexible, gas permeable membrane covering the backing surface and secured generally along the periphery of the membrane to the body member in sealing relation, the membrane being adapted to distend and move away from the backing surface upon the delivery of gas under pressure to the diffuser, with the gas flowing through the distended portion of the membrane and into the liquid in the form of relatively small gas bubbles, and being adapted to collapse into engagement with the backing member when gas under pressure is not delivered to the diffuser. The diffuser also has check valve means comprising a movable valve member on the membrane and a valve seat on the body member at said outlet, the movable valve member being moved away from the valve seat along with the membrane when air under pressure is delivered to the diffuser to open the check valve for allowing the gas to enter the space between the member and the backing surface, and the movable valve member being moved into seating relationship with the valve seat to close the check valve when gas under pressure is no longer delivered, for blocking flow of liquid into the passaging in the diffuser.
Other objects and features will be in part apparent and in part pointed out hereinafter.
BRIEF DESCRIPTION OF THE DRAWINGS
FIG. 1 is a vertical central section of a first embodiment of the diffuser means of this invention; and
FIG. 2 is a vertical central section of a second embodiment of the diffuser means.
Corresponding reference characters indicate corresponding parts throughout the several views of the drawings.
DESCRIPTION OF THE PREFERRED EMBODIMENTS
Referring to FIG. 1, there is shown a first embodiment of the diffuser of this invention comprising a body member having a generally planar, disc-shaped backing surface 1, and a passaging 2 extending up from a lower gas inlet 3. The gas inlet 3 is adapted to receive a connection or fitting from piping for delivery of gas (such as air or oxygen) under pressure from a source thereof.
A membrane 5 of gas permeable, elastic material is stretched under light tension over the backing surface. The periphery of the membrane is secured to the rim of the body member in sealing relationship by hoop band 6. To ensure a tight fit of the membrane or the body member, the edges of the membrane may be provided with a thickened edge margin (not shown) engageable by the band.
The membrane material is an elastomeric material which does not react chemically with the liquid being treated and is resistant to the growth of micro organisms thereon. The membrane has been perforated with a large number of relatively small slots or pores. With the membrane in an untensioned or slightly tensioned condition these slots are closed and thus block flow of either gas or liquid therethrough. However, when the membrane is distended (highly tensioned) upon the delivery of gas under pressure to the diffuser, the slots open into large pores for relatively high flow rates of gas therethrough.
While the closure of the pores is generally effective to block flow of liquid back into the diffuser, when air under pressure is not delivered to the diffuser, check valve means is provided to positively block such flow of liquid. The movable member of the check valve comprises a disc 9 in axial alignment with but of larger diameter than the mouth of the inlet in the backing surface 1, which serves as the valve seat of the check valve. The disc 9 is secured to the membrane by means of a bolt 7 extending through the disc, and threaded ring 8 and nut 10.
As shown in FIG. 1, stop means generally at a central portion of the membrane holds this portion of the membrane generally adjacent the backing surface of the body member when air under pressure is delivered to the diffuser. The stop means includes interengageable means, such as the head of the bolt 7 and an abutment member 4 in the passaging 2 in the body member, enabling movement of the central portion of the membrane away from the backing surface within a predetermined range of distances.
In the operation of the diffuser, when gas under pressure is delivered to the diffuser, the air causes the membrane to distend and move away from the backing surface to the extent allowed by the stop. As the membrane distends, the pores or slots open thereby allowing the air to flow into the liquid in the form of small bubbles emanating over the entire surface of the distended portion of the membrane. When air under pressure is no longer provided, the membrane collapses into engagement with the backing surface and the pores or slots close to block flow of liquid into the diffuser. The check valve thus provides positive blockage of liquid flow into the diffuser
Referring to FIG. 2, there is generally shown a second embodiment of the diffuser which is similar to the first except the numerous elements forming the movable valve member of the check valve and stop means or the membrane have been replaced by a single member 11 having a head integrally formed in the membrane. As with the first embodiment, the portion of the membrane beneath the movable valve member is the element engageable with the valve seat.
In view of the above, it will be seen that the several objects of the invention are achieved and other advantageous results attained.
As various changes could be made in the above constructions without departing from the scope of the invention, it is intended that all matter contained in the above description or shown in the accompanying drawings shall be interpreted as illustrative and not in a limiting sense.

Claims (10)

I claim:
1. Diffuser means for use in an aeration basin for introducing gas in the form of bubbles into liquid held in the basin, said diffuser means comprising:
a body member having a backing surface and passaging in the body member extending from a gas inlet .[.adapted.]. .Iadd.positioned .Iaddend.to receive gas under pressure from a source thereof to an outlet at the backing surface for delivery of the gas under pressure thereto;
a flexible, gas permeable membrane covering the backing .[.surfce.]. .Iadd.surface .Iaddend.and secured generally along the periphery of the membrane to the body member in sealing relation, the membrane being .[.adapted.]. .Iadd.positioned .Iaddend.to distend and move away from the backing surface upon the delivery of gas under pressure to the diffuser, with the gas flowing through the distended portion of the membrane and into the liquid in the form of relatively small gas bubbles, and being .[.adapted.]. .Iadd.positioned .Iaddend.to collapse into engagement with the backing member when gas under pressure is not delivered to the diffuser;
and check valve means comprising a movable valve member on the movable with the membrane and a valve seat on the body member at said outlet, the movable valve member being moved away from the valve seat along with the membrane when gas under pressure is delivered to the diffuser to open the check valve for allowing the gas to enter the space between the member and the backing surface, and the movable valve member being moved into sealing relationship with the valve seat to close the check valve when gas under pressure is no longer delivered, for blocking flow of liquid into the passaging in the diffuser means; and
stop means comprising interengageable means on the body member and secured to the membrane generally at a central portion thereof for limiting movement of said central portion of the membrane away from the backing surface to a predetermined position spaced apart from yet being generally adjacent to the backing surface, whereby when gas under pressure is delivered to the diffuser means, the membrane distends and moves away from the backing surface but with the stop means holding the member spaced generally adjacent to the backing surface for flow of gas through the distended portion of the membrane.
2. The diffuser means set forth in claim 1 wherein the movable valve member is formed of fluid impermeable material and is carried on the membrane.
3. The diffuser set forth in claim 1 wherein the movable valve member is integrally formed in the membrane.
4. The diffuser set forth in claim 1 wherein the backing surface of the .[.diffuser.]. .Iadd.body member .Iaddend.is generally planar and the .[.member.]. .Iadd.membrane .Iaddend.is secured to the .[.diffuser.]. .Iadd.body member .Iaddend.around the periphery of the backing surface.
5. The diffuser set forth in claim 4 wherein the backing surface and the distended portion of the membrane are of generally disc shaped configuration.
6. The diffuser set forth in claim 1 wherein the membrane has a plurality of small pores formed therein which expand in size when the membrane is distended by the gas under pressure for flow of gas therethrough and which close when the membrane collapses against the backing surface for blocking flow of liquid therethrough. .Iadd.
7. Diffuser means for use in an aeration basin for introducing gas in the form of bubbles into liquid held in the basin, said diffuser means comprising:
a body member having a backing surface and passaging in the body member extending from a gas inlet positioned to receive gas under pressure from a source thereof to an outlet at the backing surface for delivery of the gas under pressure thereto;
a flexible, gas-permeable membrane covering the backing surface and secured generally along the periphery of the membrane to the body member in sealing relation, the membrane being positioned to distend and move away from the backing surface upon the delivery of gas under pressure to the diffuser, with the gas flowing through the distended portion of the membrane and into the liquid in the form of relatively small gas bubbles, and being positioned to collapse into engagement with the backing member when gas under pressure is not delivered to the diffuser;
and check valve means comprising movable valve member means movable with the membrane and a valve seat on the body member at said outlet, the movable valve member means being moved away from the valve seat along with the membrane when gas under pressure is delivered to the diffuser to open the check valve for allowing the gas to enter the space between the member and the backing surface, and the movable valve member means being moved into sealing relationship with the valve seat to close the check valve when gas under pressure is no longer delivered, for blocking flow of liquid into the passaging in the diffuser means; and
stop means comprising interengageable means on the body member and the member generally at central portions thereof for holding the central portion of the member generally adjacent to the central portion of the backing surface, whereby when gas under pressure is delivered to the diffuser means, the membrane distends, with portions of the membrane spaced outwardly of said central portion moving away from the backing surface but with the central portion of the membrane remaining held closely adjacent to the central portion of the backing surface by said stop means. .Iadd.
8. The diffuser means of claim 7, wherein said movable valve member means is formed as an integral portion of said membrane. .Iadd.
9. The diffuser means of claim 8, wherein the movable valve member means is formed of material which is fluid-impermeable when pressurized gas is applied. .Iadd.
10. The diffuser of claim 7, wherein said movable valve member means is a separate component from said membrane mounted to said membrane. .Iadd.11. The diffuser of claim 7, wherein said movable valve member means is distinct from said membrane and is at least in part embedded in said membrane. .Iadd.12. The diffuser of claim 7, wherein the backing surface of the body member is generally planar and the membrane is secured to the body member around the periphery of the backing surface. .Iadd.13. The diffuser of claim 12, wherein the backing surface and the distended portion of the membrane are of generally disc-shaped configuration. .Iadd.14. The diffuser of claim 7, wherein at least the portions of the membrane spaced outwardly of said central portion thereof have a plurality of small pores formed therein which expand in size when the membrane is distended by the gas under pressure for flow of gas therethrough and which close when the membrane collapses against the backing surface for blocking flow of liquid therethrough. .Iadd.15. The diffuser of claim 7, wherein said interengageable means is secured to the membrane generally at a central portion thereof for limiting movement of said central portion of the membrane away from the backing surface to a predetermined position spaced apart from yet being generally adjacent to the backing surface. .Iadd.16. The apparatus of claim 7, wherein said stop means, when gas under pressure is supplied, holds said central portion of said membrane against said backing surface.
US07/564,316 1984-03-21 1990-08-07 Diffuser for aeration basin Expired - Lifetime USRE33812E (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE3410267 1984-03-16
DE19843410267 DE3410267A1 (en) 1984-03-21 1984-03-21 GASIFIER

Related Parent Applications (2)

Application Number Title Priority Date Filing Date
US06714658 Continuation 1985-03-21
US07/013,158 Reissue US4764314A (en) 1984-03-21 1987-02-10 Diffuser for aeration basin

Publications (1)

Publication Number Publication Date
USRE33812E true USRE33812E (en) 1992-02-04

Family

ID=6231118

Family Applications (3)

Application Number Title Priority Date Filing Date
US07/013,158 Ceased US4764314A (en) 1984-03-21 1987-02-10 Diffuser for aeration basin
US07/222,461 Expired - Fee Related US4848749A (en) 1984-03-16 1988-07-21 Diffuser for aeration basin
US07/564,316 Expired - Lifetime USRE33812E (en) 1984-03-21 1990-08-07 Diffuser for aeration basin

Family Applications Before (2)

Application Number Title Priority Date Filing Date
US07/013,158 Ceased US4764314A (en) 1984-03-21 1987-02-10 Diffuser for aeration basin
US07/222,461 Expired - Fee Related US4848749A (en) 1984-03-16 1988-07-21 Diffuser for aeration basin

Country Status (3)

Country Link
US (3) US4764314A (en)
EP (1) EP0160193B1 (en)
DE (1) DE3410267A1 (en)

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5705063A (en) * 1997-03-13 1998-01-06 Lee; Shou-Hua Ventilating disk assembly
US6406005B1 (en) * 1996-11-12 2002-06-18 Aquatec-Maxcon Pty Ltd Diffuser for aerating a fluid
US20040163338A1 (en) * 2003-02-26 2004-08-26 Unirac, Inc., A New Mexico Corporation Low profile mounting system
US7260918B2 (en) 2001-07-20 2007-08-28 Unirac, Inc. Apparatus and method for positioning a module on an object
WO2014144586A3 (en) * 2013-03-15 2014-11-20 Artemis Rubber Technology Inc Aeration element for the gasification of liquids
US10105659B2 (en) 2013-03-15 2018-10-23 Claudius Jaeger Dual control lateral air manifold assembly

Families Citing this family (39)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3410267A1 (en) * 1984-03-21 1985-09-26 Norbert 5657 Haan Schneider GASIFIER
DE3636577C2 (en) * 1986-10-28 1994-04-21 Jaeger Arnold Water aerator
EP0229386A1 (en) * 1986-01-07 1987-07-22 Jäger, Arnold Water aerator
DE3710910C2 (en) * 1987-04-01 1996-02-01 Jaeger Arnold Device for aerating water
DE3818999A1 (en) * 1988-06-03 1989-12-14 Norbert Schneider Gas-introduction and circulation apparatus for liquids
CA2000236C (en) * 1988-10-08 1995-09-12 Hans-Joachim Bassfeld Aeration installation
DE3834317C1 (en) * 1988-10-08 1990-01-25 Envicon Luft- Und Wassertechnik Gmbh & Co Kg, 4220 Dinslaken, De Apparatus for introducing gas into a liquid
AT391126B (en) * 1989-02-13 1990-08-27 Klima Horst Ing DEVICE FOR FINE-BUBBLE VENTILATION OF WASTEWATER
AT391127B (en) * 1989-02-13 1990-08-27 Klima Horst Ing DEVICE FOR FINE-BUBBLE VENTILATION OF WASTEWATER
US5093047A (en) * 1990-01-18 1992-03-03 Roediger Pittsburgh, Inc. Gas diffuser
US4981623A (en) * 1990-03-12 1991-01-01 Aquatec, Inc. Diffuser for aeration basin
US5183595A (en) * 1990-04-20 1993-02-02 Schuessler Karl H Device for gassing liquids
GB9009205D0 (en) * 1990-04-24 1990-06-20 Mcdonald Alistair J Process and apparatus for biological treatment of effluent
US5133862A (en) * 1991-01-31 1992-07-28 Fmc Corporation Flexible membrane diffuser
GB9109713D0 (en) * 1991-05-03 1991-06-26 Todd John J Apparatus for the gasification of liquids
EP0549518B1 (en) * 1991-12-20 1995-08-23 HUBER & SUHNER AG KABEL-, KAUTSCHUK-, KUNSTSTOFF-WERKE Apparatus for introducing gas into a liquid
DE4231696A1 (en) * 1992-09-22 1994-03-24 Huber+Suhner Ag Method and device for producing a gassing membrane
FR2705334A1 (en) * 1993-05-19 1994-11-25 Perret Jean Luc Modular dispenser of fine bubbles
ES2085841T3 (en) 1994-09-29 1999-01-16 Schussler Karl Heinz GASIFICATION DEVICE.
DE29518898U1 (en) * 1995-12-01 1996-03-07 Envicon Klärtechnik Verwaltungsgesellschaft mbH, 46537 Dinslaken Ventilation device
USD386243S (en) * 1995-12-13 1997-11-11 Nopon Oy Diffuser for water aeration
DE19735188A1 (en) * 1997-08-14 1999-02-18 Gummi Jaeger Kg Gmbh & Cie Water aerator
WO1999067014A1 (en) * 1998-06-23 1999-12-29 Red Valve Company, Inc. Fine bubble diffuser
DE19850025C2 (en) * 1998-10-30 2002-05-02 Thomas Funk Device for enriching drinking water with oxygen
DE19938226A1 (en) * 1999-08-12 2001-02-22 Forschungszentrum Juelich Gmbh Process for gasifying liquids suitable for human consumption, especially wine, comprises introducing oxygen into the liquid and using membrane permeation
AUPR907901A0 (en) * 2001-11-23 2001-12-20 Lawson, Thomas Urie Device for aerating liquids
RU2211189C1 (en) * 2002-03-14 2003-08-27 Общество с ограниченной ответственностью "Научно-производственное предприятие Патфил" Disc aerator
RU2220917C1 (en) * 2002-05-14 2004-01-10 Общество с ограниченной ответственностью "Научно-производственное предприятие Патфил" Aeration system
CN100410188C (en) * 2002-11-23 2008-08-13 爱科特麦克司有限公司 A liquid aeration diffuser
DE20218719U1 (en) * 2002-12-02 2003-02-27 Gummi-Jäger GmbH, 30625 Hannover Device for aerating water
US6811148B2 (en) * 2003-04-29 2004-11-02 Stamford Scientific Int'l, Inc. Quick-connect diffuser assembly
TW200918160A (en) * 2007-10-18 2009-05-01 Kang Na Hsiung Entpr Co Ltd Gas dispersion device for aeration system
US8002248B2 (en) * 2008-06-19 2011-08-23 Kang Na Hsiung Enterprise Co., Ltd. Diffuser for an aeration system
DE102010029754A1 (en) * 2010-06-07 2011-12-08 Invent Umwelt- Und Verfahrenstechnik Ag Device for gassing liquids
US10183792B2 (en) * 2014-07-02 2019-01-22 Conopco, Inc. Container
US9498756B2 (en) * 2014-12-24 2016-11-22 Thomas E. Frankel Assembly for wastewater treatment
US9688553B1 (en) 2015-08-27 2017-06-27 Lake Savers, LLC Ceramic micro-porous water aeration diffuser
KR20240133769A (en) * 2018-01-29 2024-09-04 다이노 노벨 인코포레이티드 Mechanically-gassed emulsion explosives and methods related thereto
WO2023028425A1 (en) 2021-08-25 2023-03-02 Dyno Nobel Inc. Mechanically gassed emulsion explosives and related methods and systems

Citations (31)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1642051A (en) * 1925-07-28 1927-09-13 Wall Harold Aerator for flotation ore separators
DE507294C (en) * 1929-01-05 1931-01-05 Eugen G Stich Device for aerating liquids
US2718275A (en) * 1953-04-27 1955-09-20 Infilco Inc Degasifying apparatus and method
GB824376A (en) * 1956-12-19 1959-11-25 Distillers Co Yeast Ltd Gas liquid contacting means
DE1254600B (en) * 1964-04-24 1967-11-23 Eimco Corp Device for distributing fine gas bubbles in a liquid
US3396950A (en) * 1967-01-16 1968-08-13 Elmer R. Wood Diffuser for sewage treatment
DE6751014U (en) * 1968-07-27 1969-01-23 Jack Neville Thompson BUBBLE DISTRIBUTOR
US3441216A (en) * 1964-11-16 1969-04-29 Raymond J Good Air diffuser unit for aerating sewage
DE1609004A1 (en) * 1966-11-09 1969-11-06 Schreiber August Clarification plant for wastewater treatment with ventilation taking place in the horizontally flowing wastewater activated sludge mixture
US3525436A (en) * 1968-10-02 1970-08-25 Pollution Control Inc Sewage treatment plant
US3532272A (en) * 1967-04-21 1970-10-06 Activated Sludge Ltd Means for diffusing gases into liquids
US3575350A (en) * 1967-02-15 1971-04-20 Allan H Willinger Air stone for an aquarium
DE2035651A1 (en) * 1970-07-17 1972-01-27 Schriber A Device for fine-bubble aerating liquids, in particular waste water, and method for operating the device
DE1767497A1 (en) * 1968-05-16 1972-12-28 Engelbart Fritz Dipl Ing Simultaneous cleaning of biochemically degradable water in deep ponds
US3768788A (en) * 1971-04-21 1973-10-30 S Candel Liquid aeration method and apparatus
DE2261994A1 (en) * 1972-12-19 1974-06-20 Martin Dipl-Ing Danjes Effluent treatment plant aerator - having an elastic membrane-type air tube
US3911064A (en) * 1971-04-08 1975-10-07 Union Carbide Corp System for gas sparging into liquid
DE2554738A1 (en) * 1974-12-06 1976-06-10 Reed International Ltd SUPPORT FOR A DIFFUSER FOR A GAS FEED PIPE
US3977606A (en) * 1975-05-05 1976-08-31 Wyss Robert J Diffuser device
US3997634A (en) * 1973-10-09 1976-12-14 Downs Ernest W Diffuser assembly
US4046845A (en) * 1976-06-23 1977-09-06 Ferro Corporation Air diffuser element
DE2647920B1 (en) * 1976-10-22 1977-12-08 August Dr-Ing Schreiber Sludge activating tank for sewage treatment - has rotating bridge carrying aerating equipment above treatment circuitry
US4070279A (en) * 1976-09-13 1978-01-24 Armstrong Edward T Eductor for dissolving gases in liquids
DE2701656B1 (en) * 1977-01-17 1978-06-08 August Dr-Ing Schreiber Device for intermittent ventilation of waste water
DE2757860A1 (en) * 1977-12-23 1979-06-28 Schreiber August PROCESS AND EQUIPMENT FOR WASTE WATER PURIFICATION USING ACTIVATED SLUDGE
US4243616A (en) * 1979-02-15 1981-01-06 Ronald Wyss Air diffuser
DE2942607A1 (en) * 1979-10-22 1981-04-30 Rudolf 8551 Adelsdorf Messner DEVICE FOR FINE-BUBBLE VENTILATION OF WATER
US4288394A (en) * 1978-10-19 1981-09-08 Water Pollution Control Corp. Sewage aeration system
DE3101526A1 (en) * 1981-01-19 1982-08-05 Schreiber, August, Dr.-Ing., 3000 Hannover Process and treatment plant for waste water purification
DE3316140A1 (en) * 1982-05-03 1983-11-03 Techtransfer GmbH & Co KG, 7000 Stuttgart Surface aerator for gassing liquids with fine bubbles
US4764314A (en) * 1984-03-21 1988-08-16 Norbert Schneider Diffuser for aeration basin

Patent Citations (33)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US1642051A (en) * 1925-07-28 1927-09-13 Wall Harold Aerator for flotation ore separators
DE507294C (en) * 1929-01-05 1931-01-05 Eugen G Stich Device for aerating liquids
US2718275A (en) * 1953-04-27 1955-09-20 Infilco Inc Degasifying apparatus and method
GB824376A (en) * 1956-12-19 1959-11-25 Distillers Co Yeast Ltd Gas liquid contacting means
DE1254600B (en) * 1964-04-24 1967-11-23 Eimco Corp Device for distributing fine gas bubbles in a liquid
US3441216A (en) * 1964-11-16 1969-04-29 Raymond J Good Air diffuser unit for aerating sewage
DE1609004A1 (en) * 1966-11-09 1969-11-06 Schreiber August Clarification plant for wastewater treatment with ventilation taking place in the horizontally flowing wastewater activated sludge mixture
US3396950A (en) * 1967-01-16 1968-08-13 Elmer R. Wood Diffuser for sewage treatment
US3575350A (en) * 1967-02-15 1971-04-20 Allan H Willinger Air stone for an aquarium
US3532272A (en) * 1967-04-21 1970-10-06 Activated Sludge Ltd Means for diffusing gases into liquids
DE1767497A1 (en) * 1968-05-16 1972-12-28 Engelbart Fritz Dipl Ing Simultaneous cleaning of biochemically degradable water in deep ponds
DE6751014U (en) * 1968-07-27 1969-01-23 Jack Neville Thompson BUBBLE DISTRIBUTOR
US3525436A (en) * 1968-10-02 1970-08-25 Pollution Control Inc Sewage treatment plant
DE2035651A1 (en) * 1970-07-17 1972-01-27 Schriber A Device for fine-bubble aerating liquids, in particular waste water, and method for operating the device
US3911064A (en) * 1971-04-08 1975-10-07 Union Carbide Corp System for gas sparging into liquid
US3768788A (en) * 1971-04-21 1973-10-30 S Candel Liquid aeration method and apparatus
DE2261994A1 (en) * 1972-12-19 1974-06-20 Martin Dipl-Ing Danjes Effluent treatment plant aerator - having an elastic membrane-type air tube
US3997634A (en) * 1973-10-09 1976-12-14 Downs Ernest W Diffuser assembly
DE2554738A1 (en) * 1974-12-06 1976-06-10 Reed International Ltd SUPPORT FOR A DIFFUSER FOR A GAS FEED PIPE
US4007240A (en) * 1974-12-06 1977-02-08 Reed International Limited Supporting arrangements for porous diffusers
US3977606A (en) * 1975-05-05 1976-08-31 Wyss Robert J Diffuser device
US4046845A (en) * 1976-06-23 1977-09-06 Ferro Corporation Air diffuser element
US4070279A (en) * 1976-09-13 1978-01-24 Armstrong Edward T Eductor for dissolving gases in liquids
DE2647920B1 (en) * 1976-10-22 1977-12-08 August Dr-Ing Schreiber Sludge activating tank for sewage treatment - has rotating bridge carrying aerating equipment above treatment circuitry
DE2701656B1 (en) * 1977-01-17 1978-06-08 August Dr-Ing Schreiber Device for intermittent ventilation of waste water
DE2757860A1 (en) * 1977-12-23 1979-06-28 Schreiber August PROCESS AND EQUIPMENT FOR WASTE WATER PURIFICATION USING ACTIVATED SLUDGE
US4288394A (en) * 1978-10-19 1981-09-08 Water Pollution Control Corp. Sewage aeration system
US4243616A (en) * 1979-02-15 1981-01-06 Ronald Wyss Air diffuser
DE2942607A1 (en) * 1979-10-22 1981-04-30 Rudolf 8551 Adelsdorf Messner DEVICE FOR FINE-BUBBLE VENTILATION OF WATER
EP0028728A1 (en) * 1979-10-22 1981-05-20 Rudolf Messner Device for aerating water with fine air bubbles
DE3101526A1 (en) * 1981-01-19 1982-08-05 Schreiber, August, Dr.-Ing., 3000 Hannover Process and treatment plant for waste water purification
DE3316140A1 (en) * 1982-05-03 1983-11-03 Techtransfer GmbH & Co KG, 7000 Stuttgart Surface aerator for gassing liquids with fine bubbles
US4764314A (en) * 1984-03-21 1988-08-16 Norbert Schneider Diffuser for aeration basin

Non-Patent Citations (5)

* Cited by examiner, † Cited by third party
Title
Enviroquip catalog excerpt, "Snap-Cap Diffuses", Feb. 1987.
Enviroquip catalog excerpt, Snap Cap Diffusers, Feb. 1987. *
Nokia catalog excerpt, Catalog No. 8.6.0, Apr. 1977. *
Parkson Corporation catalog excerpt, "Diffused Aeration Products", date unknown.
Parkson Corporation catalog excerpt, Diffused Aeration Products , date unknown. *

Cited By (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6406005B1 (en) * 1996-11-12 2002-06-18 Aquatec-Maxcon Pty Ltd Diffuser for aerating a fluid
US5705063A (en) * 1997-03-13 1998-01-06 Lee; Shou-Hua Ventilating disk assembly
US20100293874A1 (en) * 2001-07-20 2010-11-25 Unirac, Inc. system for mounting a photovoltaic module to a surface
US7260918B2 (en) 2001-07-20 2007-08-28 Unirac, Inc. Apparatus and method for positioning a module on an object
US20080010915A1 (en) * 2001-07-20 2008-01-17 Unirac, Inc Apparatus and method for positioning a module on an object
US7434362B2 (en) 2001-07-20 2008-10-14 Unirac, Inc. System for removably and adjustably mounting a device on a surface
US7766292B2 (en) 2001-07-20 2010-08-03 Unirac, Inc. System for mounting a photovoltaic module to a surface
US8128044B2 (en) 2001-07-20 2012-03-06 Unirac, Inc. System for mounting a photovoltaic module to a surface
US8763968B2 (en) 2001-07-20 2014-07-01 Unirac, Inc. System for mounting a photovoltaic module to a surface
US7600349B2 (en) 2003-02-26 2009-10-13 Unirac, Inc. Low profile mounting system
US7748175B2 (en) 2003-02-26 2010-07-06 Unirac, Inc. Method of manufacturing and installing a low profile mounting system
US20040163338A1 (en) * 2003-02-26 2004-08-26 Unirac, Inc., A New Mexico Corporation Low profile mounting system
US8640400B2 (en) 2003-02-26 2014-02-04 Unirac, Inc. Low profile mounting system
WO2014144586A3 (en) * 2013-03-15 2014-11-20 Artemis Rubber Technology Inc Aeration element for the gasification of liquids
US10105659B2 (en) 2013-03-15 2018-10-23 Claudius Jaeger Dual control lateral air manifold assembly

Also Published As

Publication number Publication date
US4764314A (en) 1988-08-16
EP0160193B1 (en) 1988-12-21
DE3410267C2 (en) 1988-05-11
EP0160193A1 (en) 1985-11-06
US4848749A (en) 1989-07-18
DE3410267A1 (en) 1985-09-26

Similar Documents

Publication Publication Date Title
USRE33812E (en) Diffuser for aeration basin
US5330688A (en) Flexible diffuser assembly for aeration applications
US5458771A (en) Apparatus for the gasification of liquids
US4070423A (en) Apparatus for diffusion in bodies of liquid
US4675924A (en) Emergency eye wash fountain
US3608834A (en) Gas diffuser
US6367783B1 (en) Fine bubble diffuser
US3490752A (en) Aeration device for sewage plants with biological purification
US3754740A (en) Gas distributor
US4046845A (en) Air diffuser element
US3746263A (en) Weeper assembly and method for use in a slow diffusion type irrigation system
GB824376A (en) Gas liquid contacting means
US6511054B1 (en) Porous air diffuser for treatment of liquids
US3578776A (en) Chemical feeder
US4457330A (en) Reversible quick exhaust valve
US4629126A (en) Fluid diffuser
US2639131A (en) Diffuser for gases
US3525436A (en) Sewage treatment plant
US3294380A (en) Solid dome diffuser with trap
US4597530A (en) Fluid diffuser
DE59203384D1 (en) Device for gassing a liquid.
US5204028A (en) Clamp for aeration dome
US3048339A (en) Diffuser
DE59404015D1 (en) Sanitary safety device to prevent water from flowing back
US4733689A (en) Fluid pressure activated valve

Legal Events

Date Code Title Description
FPAY Fee payment

Year of fee payment: 4

AS Assignment

Owner name: ENVIROTECH CORPORATION, A DE CORP., DBA EIMCO PROC

Free format text: ASSIGNMENT OF ASSIGNORS INTEREST.;ASSIGNORS:SCHNEIDER, NORBERT;SCHNEIDER TRAUTE;REEL/FRAME:006012/0892

Effective date: 19910717

CC Certificate of correction
FEPP Fee payment procedure

Free format text: PAYOR NUMBER ASSIGNED (ORIGINAL EVENT CODE: ASPN); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

REFU Refund

Free format text: REFUND PROCESSED. MAINTENANCE FEE TENDERED TOO EARLY (ORIGINAL EVENT CODE: R161); ENTITY STATUS OF PATENT OWNER: LARGE ENTITY

FPAY Fee payment

Year of fee payment: 8