GB1568820A - Dissolving gas in liquid - Google Patents

Dissolving gas in liquid Download PDF

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Publication number
GB1568820A
GB1568820A GB1079/76A GB107976A GB1568820A GB 1568820 A GB1568820 A GB 1568820A GB 1079/76 A GB1079/76 A GB 1079/76A GB 107976 A GB107976 A GB 107976A GB 1568820 A GB1568820 A GB 1568820A
Authority
GB
United Kingdom
Prior art keywords
tubular member
gas
liquid
stream
pocket
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
Application number
GB1079/76A
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.)
BOC Ltd
Original Assignee
BOC Ltd
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 BOC Ltd filed Critical BOC Ltd
Priority to GB1079/76A priority Critical patent/GB1568820A/en
Priority to DE19772700754 priority patent/DE2700754A1/en
Priority to AU21243/77A priority patent/AU509251B2/en
Publication of GB1568820A publication Critical patent/GB1568820A/en
Expired 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
    • C02F3/1278—Provisions for mixing or aeration of the mixed liquor
    • C02F3/1289—Aeration by saturation under super-atmospheric pressure
    • 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
    • B01F23/232—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles
    • B01F23/2323—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles by circulating the flow in guiding constructions or conduits
    • B01F23/23231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles by circulating the flow in guiding constructions or conduits being at least partially immersed in the liquid, e.g. in a closed circuit
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/234—Surface aerating
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/234—Surface aerating
    • B01F23/2341—Surface aerating by cascading, spraying or projecting a liquid into a gaseous atmosphere
    • B01F23/23413—Surface aerating by cascading, spraying or projecting a liquid into a gaseous atmosphere using nozzles for projecting the liquid into the gas atmosphere
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F25/00—Flow mixers; Mixers for falling materials, e.g. solid particles
    • B01F25/50—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle
    • B01F25/53—Circulation mixers, e.g. wherein at least part of the mixture is discharged from and reintroduced into a receptacle in which the mixture is discharged from and reintroduced into a receptacle through a recirculation tube, into which an additional component is introduced
    • 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
    • C02F3/006—Regulation methods for biological treatment
    • 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
    • C02F3/1278—Provisions for mixing or aeration of the mixed liquor
    • C02F3/1294—"Venturi" aeration means
    • 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

Description

(54) DISSOLVING GAS IN LIQUID (71) We, BOC LIMITED, an English company of Hammersmith House, London, W6 9D , England, do hereby declare the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particulary described in and by the following statement: This invention relates to dissolving gas, for example an oxygen containing gas, in liquid, for example water having an oxygen demand.
When introducing gas into a body of liquid there is often a tendency for the gas to rise through the liquid and to escape from the liquid surface before the gas has had sufficient contact time with the liquid in order for the gas to dissolve in the liquid to any great extend. Therefore a significant amount of the gas supplied does not dissolve in the liquid but is merely lost to atmosphere. Some of the previous proposals proposals for overcoming or obviating this problem have included the use of enclosed treatment tanks whereby any undissolved gas leaving the surface of liquid in the tanks is recovered. However a disadvantage of using a closed treatment tank when treating sewage liquor with an oxygen containing gas is than an oxygen rich gas mixture tends to build up in the ullage space above the surface of the liquor providing a potential danger in that explosive mixtures of oxygen and inflammable gases can build up in such ullage space.
Another proposal is to introduce bubbles of oxygen into an open body of water through a diffuser located at the bottom of the body of water. A sensor or detector is provided at the surface of the body of water and generates upon sensing an over saturaton of oxygen in the water a signal which causes cessation the supply of oxygen to the diffuser. However in this proposal the gas is merely bubbled through the volume of liquid and is not maintained for any length of time in contact with the liquid so that a significant quantity of undissolved gas could be lost from the surface of the body of water, particularly when it is relatively shallow, before saturation of the water occurs and before the oxygen supply is ceased.
A further proposal for overcoming the aforesaid problem is to use a divergent conduit located in the body of water, a downward flow of liquid being passed through the divergent conduit. The conduit is open at its upper end. Bubbles of gas are introduced into the conduit at a position where the velocity of the stream of liquid in the conduit exceeds the buoyant velocity of the gas bubbles so that the gas bubbles move downwardly with the liquid stream. Since the cross-sectional area of the conduit increases in the downward direction the velocity of the stream progressively decreases thereby prolonging the contact of the gas bubbles with the water. However in practice it is believed that gas bubbles of different sizes will be produced in the stream and the larger gas bubbles will tend to move upwardly through the divergent conduit to be lost from the surface of the liquid. Furthermore it is also thought to be likely that some of the finer bubbles moving downwardly with the stream will coalesce to form larger bubbles which will then rise to be lost from the surface of the liquid.
According to the invention there is provided a process for dissolving a gas in a liquid which process comprises passing a stream of the liquid downwardly through a substantially vertical tubular member which is closed at its upper end except for an inlet for the stream at or adjacent the upper closed end, and has an outlet at its lower end introducing gas into the stream (before it enters the tubular member) at a rate sufficient to cause a build-up of a progressively increasing pocket of gas at the upper closed end of the tubular member whereby the liquid level in the tubular member is progressively lowered, ceasing the introduction of gas into the liquid stream when the surface of the liquid in the tubular member has reached a predetermined level, then recommencing the introduction of gas into the stream and repeating the above cycle liquid with dissolved gas therein being passed from the lower end of the tubular member to a volume of the liquid.
It is preferred that the liquid stream impinges on the surface of liquid in the tubular member so as to generate further bubbles of gas by entraining some of the gas in the space above the liquid. Similarly the rising bubbles create a turbulence of upward and downward currents at the upper end of the tubular member greatly extending the gas/liquid contact time. In one embodiment of the invention, the tubular member may be located in the volume of liquid with the lower end of the tubular member open to the volume of liquid.
The stream of liquid may be withdrawn from the volume of liquid with which the outlet of the tubular member communicates.
According to a feature of the invention, the gas in said pocket above the liquid level in the tubular member may be vented either at predetermined regular intervals during operation of the process or when an analysis of the gas in the pocket shows that it has become contaminated to a predetermined degree with other gaseous products, the venting step taking place when the liquid level in the tubular member is rising and when no gas is supplied to the stream.
A preferred method of introducing gas is to pass a liquid stream through a venturi device and merely allowing the reduced pressure in the device to draw in low pressure gas from a gas line leading to the device.
The invention also provides apparatus for dissolving a gas in a liquid, which apparatus comprises a tubular member having an inlet at or adjacent its upper end which is closed apart from the inlet, and having an outlet at its lower end means for supplying a stream of the liquid under pressure to the aforesaid inlet at the upper end of the tubular member, means for introducing gas into a stream of liquid before it passes into the tubular member, and control means including first and second sensor means which are located at different levels in the tubular member and are adapted to be actuated, when the liquid level in the tubular member rises to the level of the uppermost of said sensor means, so as to operate the control means to permit the introduction of gas introduced into said stream and, when the liquid level falls to the level of the lowermost of said sensor means, so as to operate the control means to discontinue the introduction of gas into said stream, respectively.
Valve controlled vent means may be provided in the tubular member for venting gas from a pocket thereof which in use collects at the upper closed end of the tubular member. Means may be provided to operate the vent means to vent the aforesaid pocket of gas at predetermined intervals during the process cycle when no gas is supplied to the aforesaid stream. In other embodiments of the invention means may be provided for analysing the pocket of gas, there being provided means to operate said vent means to vent the pocket of gas when said analysing means show that the pocket of gas has become contaminated to a predetermined degree with gaseous components other than for the gas introduced into said stream and during a period when no gas is being supplied to said stream.
A wide variety of shapes are possible for the tubular member. It can be of circular, regular or irregular shape in cross section: it can be conical, can become more divergent with depth (trumpet shaped) or less divergent with depth (bell shaped).
Two embodiments of the invention will now be described by way of example and with reference to the accompanying drawings, in which: Figure 1 is a diagrammatic representation of an apparatus for dissolving gas in a liquid embodying the invention; and, Figure 2 is a diagrammatic representation of a second embodiment of the invention.
Referring to Figure 1 the apparatus comprise a treatment tank 10 having a tubular member 11 located therein. The tubular member 11 is conical in shape and has an open lower end spaced a short distance above the bottom of the tank 10. A vertical pipe 12 extends into the apex end of the member 11 to provide a fluid inlet into the tubular member. The tank 10 has a water outlet conduit 13. A pump 14 raises the pressure of the water to about 30 inches water gauge and delivers it through a conduit 15 which is provided with a convergent/divergent venturi nozzle 16. A valve controlled gas line 17 for the supply of oxygen also leads to the venturi 16. Conduit 15 is connected downstream of the venturi 16 to the inlet pipe section 12 leading into the tubular member.
A rotary sweeper device 19 is mounted on a bearing 20 located on a portion of the conduit 16 which extends vertically within the tank 10. The sweeper device 19 comprises a radial arm 21 and a series of different length downwardly depending fingers or chains 22. The lengths of the fingers or chains 22 are such that the free ends of the fingers wipe across the external surface of the conical member 11 as the device 19 rotates. A pair of sensors 23 and 24 terminate within the tubular member 11 at different vertical levels therein. In use of the apparatus the liquid level in the tubular member 11 will rise and fall in the region between sensors 23 and 24. When the liquid level drops to the level of sensor 24 this sensor will be actuated to provide a signal to a control unit 25 and when the liquid level rises to the level of sensor 23 that sensor will provide a signal to control unit 25. The sensors 23 and 24 may be suitable electric switches opened and closed by the rising and falling liquid level. The control unit 25 is programmed to close the valve line 17 when it receives a signal from sensor 24 and to open the valve line 17 when it receives a signal from sensor 23. A valved vent conduit 26 leads from the upper end of the tubular member. Control unit 25 is programmed to control a solenoid for opening and closing the valve in line 26 as described below.
The gas/liquid mixture delivered through inlet 12 is in a turbulent state by virtue of having been passed through the venturi 16 and comprises oxygen bubbles in suspension in the water stream. As the velocity of the water stream is lowered within the tubular member and its pressure also drops the gas in this stream comes out of solution in the form of large bubbles which rise within the tubular member to form a pocket of gas at the closed end of the tubular member which pocket progressively increases thereby progressively lowering the liquid level in the tubular member. Medium sized bubbles are also present in the water stream in tubular member 11 and these bubbles tend to remain in the water within the tubular member and thus prolong the period in which the gas contained in them remains in contact with the liquor in which it is to dissolve. The very smallest bubbles produced in the stream of water in tubular member 11 remain in the liquor stream and collect towards the lower end of the member 11. It is possible that some of the very smallest bubbles emerge from the bottom of the tubular member. The rate of operation of the pump 14 is adjusted to ensure that bubbles of a size too large to dissolve before they rise to the surface of the liquor in the tank 10 do not readily escape from the open end of the tubular member 11. The relatively fast moving liquid which emerges from the bottom of tubular member 10 agitates the sludge and lifts it to the outlet pipe 13 for recycling. The rotating sweeping device 19 prevents sludge accumulating on the outer surface of the tubular member 11 as well as aiding flocculation of the sludge and disengagement of any small gas bubbles which form theren. The sweeping device 19 typically rotates at one revolution per minute and disturbs any sludge on the tubular member which would otherwise settle with the result that the bacteria therein would die. The conical shape of the tubular member 11 also helps to prevent accumulation of sludge thereon.
When the size of the gas pocket 27 in the tubular member has increased such that the liquid level drops to the level of the sensor 23, control unit 25 closes valve line 17 to interrupt the supply of gas to the stream delivered through conduit 15. The sewage liquor continues to be delivered to tubular member 11 by pump 14 and gradually the liquid level in member 11 rises as the gas in the pocket 27 is dissolved in the liquid stream in the tubular member 11. When the liquid level reaches and actuates sensor 24 the control unit 25 effects opening of the valve line 17 so that oxygen is again introduced into the stream of liquid in conduit 15 and the liquid level in tubular member 11 thereafter begins to drop. The above described cycle is then repeated.
After a period of time the gas in the pocket 27 may become increasingly contaminated with carbon dioxide. The control unit 25 may be programmed to open vent 26 at regular intervals during the cycle when the liquid level in conduit 11 is rising and the valved gas supply line 17 is closed. During venting the sensor 24 is rendered inoperative by the control unit 25 and the liquid level is allowed to rise to the level of a third sensor 28 placed at a higher level than that of sensor 23. If the liquid level reaches sensor 28 the vent valve is closed and the valved conduit 17 is opened to once again allow the introduction of oxygen into the liquor stream passing through conduit 15.
Instead of control unit 25 being programmed to effect venting at regular intervals the composition of the gas in the pocket 27 may be continuously analysed and the control unit 27 may receive a signal from the analysing equipment when the level of carbon dioxide exceeds a predetermined value, at which point the control unit 25 operates to effect venting of the gas pocket 27.
Figure 2 shows a second embodiment of the invention which is substantially the same as the apparatus of Figure 1 except that the tubular member 30 is rectangular and has an upper end wall 31 having a central inlet aperture 32 through which the stream of pressurised liquor is delivered into the tubular member. In this embodiment the sweeper device is not required.
WHAT WE CLAIM IS: 1. A process for dissolving a gas in a liquid, which process comprises passing a stream of the liquid downwardly through a substantially vertical tubular member, which is closed at its upper end except for an
**WARNING** end of DESC field may overlap start of CLMS **.

Claims (18)

**WARNING** start of CLMS field may overlap end of DESC **. the conical member 11 as the device 19 rotates. A pair of sensors 23 and 24 terminate within the tubular member 11 at different vertical levels therein. In use of the apparatus the liquid level in the tubular member 11 will rise and fall in the region between sensors 23 and 24. When the liquid level drops to the level of sensor 24 this sensor will be actuated to provide a signal to a control unit 25 and when the liquid level rises to the level of sensor 23 that sensor will provide a signal to control unit 25. The sensors 23 and 24 may be suitable electric switches opened and closed by the rising and falling liquid level. The control unit 25 is programmed to close the valve line 17 when it receives a signal from sensor 24 and to open the valve line 17 when it receives a signal from sensor 23. A valved vent conduit 26 leads from the upper end of the tubular member. Control unit 25 is programmed to control a solenoid for opening and closing the valve in line 26 as described below. The gas/liquid mixture delivered through inlet 12 is in a turbulent state by virtue of having been passed through the venturi 16 and comprises oxygen bubbles in suspension in the water stream. As the velocity of the water stream is lowered within the tubular member and its pressure also drops the gas in this stream comes out of solution in the form of large bubbles which rise within the tubular member to form a pocket of gas at the closed end of the tubular member which pocket progressively increases thereby progressively lowering the liquid level in the tubular member. Medium sized bubbles are also present in the water stream in tubular member 11 and these bubbles tend to remain in the water within the tubular member and thus prolong the period in which the gas contained in them remains in contact with the liquor in which it is to dissolve. The very smallest bubbles produced in the stream of water in tubular member 11 remain in the liquor stream and collect towards the lower end of the member 11. It is possible that some of the very smallest bubbles emerge from the bottom of the tubular member. The rate of operation of the pump 14 is adjusted to ensure that bubbles of a size too large to dissolve before they rise to the surface of the liquor in the tank 10 do not readily escape from the open end of the tubular member 11. The relatively fast moving liquid which emerges from the bottom of tubular member 10 agitates the sludge and lifts it to the outlet pipe 13 for recycling. The rotating sweeping device 19 prevents sludge accumulating on the outer surface of the tubular member 11 as well as aiding flocculation of the sludge and disengagement of any small gas bubbles which form theren. The sweeping device 19 typically rotates at one revolution per minute and disturbs any sludge on the tubular member which would otherwise settle with the result that the bacteria therein would die. The conical shape of the tubular member 11 also helps to prevent accumulation of sludge thereon. When the size of the gas pocket 27 in the tubular member has increased such that the liquid level drops to the level of the sensor 23, control unit 25 closes valve line 17 to interrupt the supply of gas to the stream delivered through conduit 15. The sewage liquor continues to be delivered to tubular member 11 by pump 14 and gradually the liquid level in member 11 rises as the gas in the pocket 27 is dissolved in the liquid stream in the tubular member 11. When the liquid level reaches and actuates sensor 24 the control unit 25 effects opening of the valve line 17 so that oxygen is again introduced into the stream of liquid in conduit 15 and the liquid level in tubular member 11 thereafter begins to drop. The above described cycle is then repeated. After a period of time the gas in the pocket 27 may become increasingly contaminated with carbon dioxide. The control unit 25 may be programmed to open vent 26 at regular intervals during the cycle when the liquid level in conduit 11 is rising and the valved gas supply line 17 is closed. During venting the sensor 24 is rendered inoperative by the control unit 25 and the liquid level is allowed to rise to the level of a third sensor 28 placed at a higher level than that of sensor 23. If the liquid level reaches sensor 28 the vent valve is closed and the valved conduit 17 is opened to once again allow the introduction of oxygen into the liquor stream passing through conduit 15. Instead of control unit 25 being programmed to effect venting at regular intervals the composition of the gas in the pocket 27 may be continuously analysed and the control unit 27 may receive a signal from the analysing equipment when the level of carbon dioxide exceeds a predetermined value, at which point the control unit 25 operates to effect venting of the gas pocket 27. Figure 2 shows a second embodiment of the invention which is substantially the same as the apparatus of Figure 1 except that the tubular member 30 is rectangular and has an upper end wall 31 having a central inlet aperture 32 through which the stream of pressurised liquor is delivered into the tubular member. In this embodiment the sweeper device is not required. WHAT WE CLAIM IS:
1. A process for dissolving a gas in a liquid, which process comprises passing a stream of the liquid downwardly through a substantially vertical tubular member, which is closed at its upper end except for an
inlet for the stream at or adjacent the upper closed end, and has an outlet at its lower end, introducing gas into the stream (before it enters the tubular member) at a rate sufficient to cause a build-up of a progressively increasing pocket of gas at the upper closed end of the tubular member whereby the liquid level in the tubular member is progressively lowered, ceasing the introduction of gas into the liquid stream when the surface of the liquid in the tubular member has reached a predetermined level, while contaminating the introduction of liquid into the tubular member until the liquid level has risen to another predetermined level, then recommencing the introduction of gas into the stream and repeating the above cycle the liquid with dissolved gas therein being passed from the lower end of the tubular member to a volume of the liquid.
2. A process as claimed in claim 1 wherein the liquid stream impinges on the surface of liquid in the tubular member so as to generate further bubbles of gas by entraining some of the gas in the space above the liquid.
3. A process as claimed in claim 1 or claim 2 wherein the tubular member is located in the volume of liquid.
4. A process as claimed in any of the preceding claims wherein the stream of liquid is withdrawn from the volume of liquid with which the outlet of the tubular member communicates.
5. A process as claimed in any of the preceding claims wherein gas in said pocket above the liquid level in the tubular member is vented at predetermined regular intervals of time during operation of the process the venting step taking place when no gas is being supplied to the stream.
6. A process as claimed in any of claims 1 to 4 wherein gas in said pocket is vented when an analysis of the gas in the pocket shows that it has become contaminated to a predetermined degree with other gaseous products, the venting step taking place when no gas is being supplied to the stream.
7. A process as claimed in any of the preceding claims wherein gas is introduced in the liquid stream by passing the stream through a venturi device and merely allowing the reduced pressure in the device to draw in low pressure gas from a gas line leading to the device
8. A process for dissolving a gas in a liquid substantially as hereinbefore described with reference to the accompanying drawings.
9. Apparatus for dissolving a gas in a liquid, which apparatus comprises a tubular member having an iX t at or adjacent to its upper end which is ',osed apart from the inlet, and having ati cutlet at its lower end means for supplying a stream of the liquid under pressure to the aforesaid inlet at the upper end of the tubular member, means for introducing gas into a stream of liquid before it passes into the tubular member, and control means including first and second sensor means which are located at different levels in the tubular member and are adapted to be actuated, when the liquid level in the tubular member rises to the level of the uppermost of said sensor means so as to operate the control means to permit the supply of gas introduced into said stream and, when the liquid level falls to the level of the lowermost of said sensor means, so as to operate the control means to discontinue the introduction of gas into said stream, respectively.
10. Apparatus as claimed in claim 9 wherein valve controlled vent means are provided in the tubular member for venting gas from a pocket thereof which in use collects at the upper closed end of the tubular member.
11. Apparatus as claimed in claim 10 wherein means are provided to operate the vent means to vent the aforesaid pocket of gas at predetermined intervals of time during the process cycle such that venting takes place when no gas is supplied to the aforesaid stream.
12. Apparatus as claimed in claim 10 wherein means provided for analysing the pocket of gas, there being provided means to operate said vent means to vent the pocket of gas when said analysing means show that the pocket of gas has become contaminated to a predetermined degree with gaseous components other than for the gas introduced into said stream and during a period when no gas is being supplied to said stream.
13. Apparatus as claimed in any of claims 9 to 12 wherein the tubular member has a wall which diverges in the downward direction.
14. Apparatus as claimed in claim 13 wherein said wall is conical.
15. Apparatus as claimed in claim 13 or claim 14 wherein at least the lower end of the tubular member is located in a container for a body of liquid and wherein there is provided a rotary sweeper device which has elements which, when the device is rotated, sweep across the outer surface of the tubular member to disturb any solid deposits thereon.
16. Apparatus as claimed in any of claims 9 to 12 wherein the tubular member has an annular wall of constant crosssectional area.
17. Apparatus as claimed in any of claims 9 to 12 wherein the tubular member has an annular wall which converges in the downward direction.
18. Apparatus for dissolving a gas in a liquid, substantially as hereinbefore described with reference to, and as illustrated in, Figure 1 or Figure 2 of the accompanying drawings.
GB1079/76A 1976-01-12 1976-01-12 Dissolving gas in liquid Expired GB1568820A (en)

Priority Applications (3)

Application Number Priority Date Filing Date Title
GB1079/76A GB1568820A (en) 1976-01-12 1976-01-12 Dissolving gas in liquid
DE19772700754 DE2700754A1 (en) 1976-01-12 1977-01-10 PROCESS AND DEVICE FOR DISCONNECTING A GAS IN A LIQUID
AU21243/77A AU509251B2 (en) 1976-01-12 1977-01-12 Dissolving gas ina liquid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB1079/76A GB1568820A (en) 1976-01-12 1976-01-12 Dissolving gas in liquid

Publications (1)

Publication Number Publication Date
GB1568820A true GB1568820A (en) 1980-06-04

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Application Number Title Priority Date Filing Date
GB1079/76A Expired GB1568820A (en) 1976-01-12 1976-01-12 Dissolving gas in liquid

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AU (1) AU509251B2 (en)
DE (1) DE2700754A1 (en)
GB (1) GB1568820A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5512217A (en) * 1992-07-09 1996-04-30 Technological Resources Pty. Limited Reactor and method of use

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
FR2398547A1 (en) * 1977-07-26 1979-02-23 Alsthom Atlantique PROCESS FOR THE PRODUCTION OF MICROBULBS SUITABLE TO ENSURE THE TREATMENT OF A SUSPENSION
DE3340096A1 (en) * 1983-11-05 1985-05-23 Timm Dipl.-Ing. 8000 München Lessel Process for admixing a liquid with gases which it can absorb, and apparatus therefor
DE3514924A1 (en) * 1985-04-25 1986-10-30 Basf Ag, 6700 Ludwigshafen METHOD FOR PRODUCING SOLUTIONS OF MOLECULAR OXYGEN IN LIQUID HYDROCARBONS

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5512217A (en) * 1992-07-09 1996-04-30 Technological Resources Pty. Limited Reactor and method of use

Also Published As

Publication number Publication date
DE2700754A1 (en) 1977-07-14
AU2124377A (en) 1978-07-20
AU509251B2 (en) 1980-05-01

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