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GB2110550A - Treatment of effluent - Google Patents

Treatment of effluent Download PDF

Info

Publication number
GB2110550A
GB2110550A GB08135003A GB8135003A GB2110550A GB 2110550 A GB2110550 A GB 2110550A GB 08135003 A GB08135003 A GB 08135003A GB 8135003 A GB8135003 A GB 8135003A GB 2110550 A GB2110550 A GB 2110550A
Authority
GB
United Kingdom
Prior art keywords
effluent
propellor
pneumatic motor
air
motor
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.)
Withdrawn
Application number
GB08135003A
Inventor
Roy Thomas Beardmore
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.)
Beardmore And Sons Ltd R T
Original Assignee
Beardmore And Sons Ltd R T
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 Beardmore And Sons Ltd R T filed Critical Beardmore And Sons Ltd R T
Priority to GB08135003A priority Critical patent/GB2110550A/en
Publication of GB2110550A publication Critical patent/GB2110550A/en
Withdrawn legal-status Critical Current

Links

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
    • C02F3/205—Moving, e.g. rotary, diffusers; Stationary diffusers with moving, e.g. rotary, distributors
    • C02F3/207—Moving, e.g. rotary, diffusers; Stationary diffusers with moving, e.g. rotary, distributors with axial thrust propellers
    • 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
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2332—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements the stirrer rotating about a horizontal axis; Stirrers therefor
    • 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
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2336—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the location of the place of introduction of the gas relative to the stirrer
    • B01F23/23366—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the location of the place of introduction of the gas relative to the stirrer the gas being introduced in front of the stirrer
    • 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
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2336—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the location of the place of introduction of the gas relative to the stirrer
    • B01F23/23367—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements characterised by the location of the place of introduction of the gas relative to the stirrer the gas being introduced behind the stirrer
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/25—Mixers with both stirrer and drive unit submerged in the material being mixed
    • B01F27/251—Vertical beam constructions therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/113—Propeller-shaped stirrers for producing an axial flow, e.g. shaped like a ship or aircraft propeller
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/60—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a horizontal or inclined axis
    • 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

Landscapes

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

Abstract

Sewage or like effluent is treated e.g. in a tank using a combined aeration and agitation apparatus. Agitation is provided by a suitable agitating member such as a propeller 8 which is driven by means of a pneumatic motor 6. The exhaust from the pneumatic motor provides a supply of circulating air. A standard air compressor can thus be used to provide both agitation and injected air supply to effluent in order to reduce its B.O.D. <IMAGE>

Description

SPECIFICATION Treatment of effluent This invention relates to the treatment of effluent.
In order to treat effluent, for example sewage, to render the effluent suitable for disposal e.g. by dumping into rivers or the sea, it is well known to treat the effluent in tanks with a view to reducing its biological oxygen demand (B.O.D.) and to ensure that the effluent is thoroughly mixed.
Conventionally it is known to introduce oxygen (in the form of air) into liquid effluent kept in such tanks with a view to oxidising materials therein. In addition to the agitation provided by the bubbles of oxygen themselves, it is well known to agitate the liquid in the tank as a whole, for example using propellor or turbine circulating devices.
According to the present invention, effluent is treated by simultaneously agitating it and supplying oxygen to it, wherein the agitation is effected by a mechanical agitator, the mechanical agitator is driven by means of a pneumatic motor and the oxygen is introduced as the exhaust from the pneumatic motor.
This sytem can be designed to work with great efficiency and flexibility. All that is required is a source of compressed air, and a conventional air compressor may be used for this purpose.
Mechanical agitation is preferably secured by means of a propellor. The exhaust gas from the pneumatic motor may be fed into the liquid effluent medium either upstream or downstream of the propellor, and is preferably fed by means of a suitable distribution device which breaks it up into a stream of relatively small size bubbles. If the discharge is upstream of the propellor, the propellor action itself may assist in distributing the air.
Preferably between the air distributing device and the pneumatic motor there is one or more non-return valves arranged to stop liquid effluent entering the pneumatic motor where it might cause damage. The motor casing should in such a case be likewise liquid impermeable.
The geometrical arrangement of treatment tank or pond and effluent treatment device may vary very widely. One suitable arrangement is shown by way of example in the accompanying drawing.
Referring to the drawing this shows part of the wall of a generally cylindrical effluent treatment tank, denoted 11. Set on the top of wall 1 1 is a mounting frame 1 one corner of which supports a pillar on which is mounted a vertical shaft 2 which projects downwardly into tank 11. A carriage 5 is mounted for vertically sliding movement on shaft 2 and a support arm 3 extends from the top of shaft 2. Set on the support arm is a chain hoist 4, which supports carriage 5 and its associated equipment.
On carriage 5 is located a sealed pneumatic motor unit 6 having a drive shaft on which is mounted a propellor 8 for anti-clockwise rotation as seen in the drawing.
In use, compressed air is fed to the pneumatic motor 6 via an air pipe 9. This drives the motor and at the same time the air is exhausted via a manifold 7 connected to the pneumatic motor by one or more non-return valves. Air leaves the end of manifold 7 just behind the plane of rotation of propellor 8 and is entrained with the stream of circulating liquid generated by rotation of the propellor. Air pipe 9 is tethered to the support chain depending from chain hoist 4 in order to ensure that it does not get undesirably sucked towards the propellor and damaged should it come into contact with the propellor. In order to ensure that the whole of the liquid in the tank is treated, means are provided to enable shaft 2 to swivel about its longitudinal axis and accordingly to direct the stream of liquid effluent otherwise than radially with respect to the tank.Swivelling may be effected by a handle 10.
1. A method of treating effluent which method comprises simultaneously agitating and supplying oxygen to the effluent wherein the agitation is effected by a mechanical agitator, the mechanical agitator is driven by means of a pneumatic motor and the oxygen is introduced and the exhaust from the pneumatic motor.
2. A method according to claim 1 wherein the agitation is effected by a propellor driven by a air powered motor submerged in the effluent and compressed air is supplied to drive the motor.
3. A method according to claim 1 or 2 wherein the exhaust gas from the motor is fed into the liquid effluent medium directly upstream or downstream of the mechanical agitator.
4. A method according to claim 2 wherein the exhaust gas from the motor is discharged immediately upstream of the propellor.
5. A method of treating effluent substantially as described with reference to the accompanying drawing.
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (5)

**WARNING** start of CLMS field may overlap end of DESC **. SPECIFICATION Treatment of effluent This invention relates to the treatment of effluent. In order to treat effluent, for example sewage, to render the effluent suitable for disposal e.g. by dumping into rivers or the sea, it is well known to treat the effluent in tanks with a view to reducing its biological oxygen demand (B.O.D.) and to ensure that the effluent is thoroughly mixed. Conventionally it is known to introduce oxygen (in the form of air) into liquid effluent kept in such tanks with a view to oxidising materials therein. In addition to the agitation provided by the bubbles of oxygen themselves, it is well known to agitate the liquid in the tank as a whole, for example using propellor or turbine circulating devices. According to the present invention, effluent is treated by simultaneously agitating it and supplying oxygen to it, wherein the agitation is effected by a mechanical agitator, the mechanical agitator is driven by means of a pneumatic motor and the oxygen is introduced as the exhaust from the pneumatic motor. This sytem can be designed to work with great efficiency and flexibility. All that is required is a source of compressed air, and a conventional air compressor may be used for this purpose. Mechanical agitation is preferably secured by means of a propellor. The exhaust gas from the pneumatic motor may be fed into the liquid effluent medium either upstream or downstream of the propellor, and is preferably fed by means of a suitable distribution device which breaks it up into a stream of relatively small size bubbles. If the discharge is upstream of the propellor, the propellor action itself may assist in distributing the air. Preferably between the air distributing device and the pneumatic motor there is one or more non-return valves arranged to stop liquid effluent entering the pneumatic motor where it might cause damage. The motor casing should in such a case be likewise liquid impermeable. The geometrical arrangement of treatment tank or pond and effluent treatment device may vary very widely. One suitable arrangement is shown by way of example in the accompanying drawing. Referring to the drawing this shows part of the wall of a generally cylindrical effluent treatment tank, denoted 11. Set on the top of wall 1 1 is a mounting frame 1 one corner of which supports a pillar on which is mounted a vertical shaft 2 which projects downwardly into tank 11. A carriage 5 is mounted for vertically sliding movement on shaft 2 and a support arm 3 extends from the top of shaft 2. Set on the support arm is a chain hoist 4, which supports carriage 5 and its associated equipment. On carriage 5 is located a sealed pneumatic motor unit 6 having a drive shaft on which is mounted a propellor 8 for anti-clockwise rotation as seen in the drawing. In use, compressed air is fed to the pneumatic motor 6 via an air pipe 9. This drives the motor and at the same time the air is exhausted via a manifold 7 connected to the pneumatic motor by one or more non-return valves. Air leaves the end of manifold 7 just behind the plane of rotation of propellor 8 and is entrained with the stream of circulating liquid generated by rotation of the propellor. Air pipe 9 is tethered to the support chain depending from chain hoist 4 in order to ensure that it does not get undesirably sucked towards the propellor and damaged should it come into contact with the propellor. In order to ensure that the whole of the liquid in the tank is treated, means are provided to enable shaft 2 to swivel about its longitudinal axis and accordingly to direct the stream of liquid effluent otherwise than radially with respect to the tank.Swivelling may be effected by a handle 10. CLAIMS
1. A method of treating effluent which method comprises simultaneously agitating and supplying oxygen to the effluent wherein the agitation is effected by a mechanical agitator, the mechanical agitator is driven by means of a pneumatic motor and the oxygen is introduced and the exhaust from the pneumatic motor.
2. A method according to claim 1 wherein the agitation is effected by a propellor driven by a air powered motor submerged in the effluent and compressed air is supplied to drive the motor.
3. A method according to claim 1 or 2 wherein the exhaust gas from the motor is fed into the liquid effluent medium directly upstream or downstream of the mechanical agitator.
4. A method according to claim 2 wherein the exhaust gas from the motor is discharged immediately upstream of the propellor.
5. A method of treating effluent substantially as described with reference to the accompanying drawing.
GB08135003A 1981-11-20 1981-11-20 Treatment of effluent Withdrawn GB2110550A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB08135003A GB2110550A (en) 1981-11-20 1981-11-20 Treatment of effluent

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB08135003A GB2110550A (en) 1981-11-20 1981-11-20 Treatment of effluent

Publications (1)

Publication Number Publication Date
GB2110550A true GB2110550A (en) 1983-06-22

Family

ID=10526029

Family Applications (1)

Application Number Title Priority Date Filing Date
GB08135003A Withdrawn GB2110550A (en) 1981-11-20 1981-11-20 Treatment of effluent

Country Status (1)

Country Link
GB (1) GB2110550A (en)

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985001452A1 (en) * 1983-08-12 1985-04-11 A/S Landia Aerator for introducing air into liquids
EP0363009A1 (en) * 1988-09-06 1990-04-11 Babcock-Hitachi Kabushiki Kaisha Wet-type exhaust gas desulfurizing apparatus
EP0381635A1 (en) * 1989-01-11 1990-08-08 ITT Flygt Aktiebolag Submersible mixer
DE4112511A1 (en) * 1991-04-17 1992-10-22 Itt Flygt Pumpen Gmbh Submersible agitator esp. for waste water in activation ponds - in which agitator motor is attached to column fixed at upper end and resting on floor of pond at other end, and length of column is greater than depth of water
FR2736906A1 (en) * 1995-07-20 1997-01-24 Tmi Tech Du Melange Indsutriel Handling of heavy weights, such as water treatment mixers - using a device carrying two asymmetric hooks joined together to pick up the weight.
WO2008104320A2 (en) * 2007-02-27 2008-09-04 Uts Biogastechnik Gmbh Fermenter for biogas plants, comprising a submersible motor-driven stirrer vertically adjustable by means of a motor
EP2689831A1 (en) * 2012-07-26 2014-01-29 Michael Niederbacher Bio gas facility
CZ306266B6 (en) * 2007-03-20 2016-11-09 VĂŤTKOVICE ENVI a.s. Mixing device and method of mixing anaerobic reactor
WO2021180760A1 (en) * 2020-03-11 2021-09-16 Xylem Europe Gmbh Guide bar assembly

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1985001452A1 (en) * 1983-08-12 1985-04-11 A/S Landia Aerator for introducing air into liquids
EP0363009A1 (en) * 1988-09-06 1990-04-11 Babcock-Hitachi Kabushiki Kaisha Wet-type exhaust gas desulfurizing apparatus
US5429808A (en) * 1988-09-06 1995-07-04 Babcock-Hitachi Kabushiki Kaisha Wet-type exhaust gas desulfurizing apparatus
EP0381635A1 (en) * 1989-01-11 1990-08-08 ITT Flygt Aktiebolag Submersible mixer
AU619625B2 (en) * 1989-01-11 1992-01-30 Flygt Ab Submerged-motor agitator for mixing and sludge activation vessels
DE4112511A1 (en) * 1991-04-17 1992-10-22 Itt Flygt Pumpen Gmbh Submersible agitator esp. for waste water in activation ponds - in which agitator motor is attached to column fixed at upper end and resting on floor of pond at other end, and length of column is greater than depth of water
FR2736906A1 (en) * 1995-07-20 1997-01-24 Tmi Tech Du Melange Indsutriel Handling of heavy weights, such as water treatment mixers - using a device carrying two asymmetric hooks joined together to pick up the weight.
WO2008104320A2 (en) * 2007-02-27 2008-09-04 Uts Biogastechnik Gmbh Fermenter for biogas plants, comprising a submersible motor-driven stirrer vertically adjustable by means of a motor
WO2008104320A3 (en) * 2007-02-27 2008-11-13 Uts Biogastechnik Gmbh Fermenter for biogas plants, comprising a submersible motor-driven stirrer vertically adjustable by means of a motor
CZ306266B6 (en) * 2007-03-20 2016-11-09 VĂŤTKOVICE ENVI a.s. Mixing device and method of mixing anaerobic reactor
EP2689831A1 (en) * 2012-07-26 2014-01-29 Michael Niederbacher Bio gas facility
WO2014015948A3 (en) * 2012-07-26 2014-04-10 Michael Niederbacher Biogas plant
WO2021180760A1 (en) * 2020-03-11 2021-09-16 Xylem Europe Gmbh Guide bar assembly

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Legal Events

Date Code Title Description
WAP Application withdrawn, taken to be withdrawn or refused ** after publication under section 16(1)