GB2069353A - Apparatus for agitating and/or aerating liquids - Google Patents
Apparatus for agitating and/or aerating liquids Download PDFInfo
- Publication number
- GB2069353A GB2069353A GB8100940A GB8100940A GB2069353A GB 2069353 A GB2069353 A GB 2069353A GB 8100940 A GB8100940 A GB 8100940A GB 8100940 A GB8100940 A GB 8100940A GB 2069353 A GB2069353 A GB 2069353A
- Authority
- GB
- United Kingdom
- Prior art keywords
- passageway
- diffuser
- liquid
- gas
- wall
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 239000007788 liquid Substances 0.000 title claims abstract description 32
- 230000003247 decreasing effect Effects 0.000 claims abstract description 3
- 239000010865 sewage Substances 0.000 claims description 6
- 230000002093 peripheral effect Effects 0.000 claims description 4
- 239000000463 material Substances 0.000 description 4
- 239000004743 Polypropylene Substances 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000004033 plastic Substances 0.000 description 3
- 229920003023 plastic Polymers 0.000 description 3
- -1 polypropylene Polymers 0.000 description 3
- 229920001155 polypropylene Polymers 0.000 description 3
- 238000011065 in-situ storage Methods 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 239000010802 sludge Substances 0.000 description 2
- 239000011343 solid material Substances 0.000 description 2
- 239000000725 suspension Substances 0.000 description 2
- 229910000831 Steel Inorganic materials 0.000 description 1
- 230000002301 combined effect Effects 0.000 description 1
- 230000007423 decrease Effects 0.000 description 1
- 238000006073 displacement reaction Methods 0.000 description 1
- 230000003647 oxidation Effects 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 238000000926 separation method Methods 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000005728 strengthening Methods 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23123—Diffusers consisting of rigid porous or perforated material
-
- 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
-
- 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
-
- 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
- B01F23/23125—Diffusers characterised by the way in which they are assembled or mounted; Fabricating the parts of the diffusers
-
- 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
- B01F23/231261—Diffusers characterised by the shape of the diffuser element having a box- or block-shape, being in the form of aeration stones
-
- 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
- B01F25/20—Jet mixers, i.e. mixers using high-speed fluid streams
- B01F25/21—Jet mixers, i.e. mixers using high-speed fluid streams with submerged injectors, e.g. nozzles, for injecting high-pressure jets into a large volume or into mixing chambers
- B01F25/211—Jet mixers, i.e. mixers using high-speed fluid streams with submerged injectors, e.g. nozzles, for injecting high-pressure jets into a large volume or into mixing chambers the injectors being surrounded by guiding tubes
-
- 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
-
- 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
Apparatus for agitating and aerating a liquid, the apparatus including a liquid inlet 37 and a liquid outlet 34 located above the inlet, a first passageway 53 extending upwardly from the inlet to communicate with a restricted passageway 50, said first passageway 53 progressively decreasing in cross- sectional area toward said restricted passageway, a second passageway extending upwardly from the restricted passageway to the liquid outlet 34, and gas outlet means for expelling gas into the restricted passageway, the second passageway defining an expansion chamber for gas and liquid emerging from the restricted passageway. <IMAGE>
Description
SPECIFICATION
Apparatus for agitating and/or aerating liquids
The present invention relates to an apparatus for agitating and/or aerating liquids, and is particularly suitable for use in the treatment of sewage and organic effluents.
According to the present invention there is provided an apparatus for agitating a liquid, the apparatus includes a liquid inlet and liquid outlet located above the inlet, a first passageway extending upwardly from the inlet to communicate with a restricted passageway said first passageway progressively decreasing in crosssectional area toward said restricted passageway, a second passageway extending upwardly from the restricted passageway to the liquid outlet, and gas outlet means for expelling gas into the restricted passageway, the second passageway defining an expansion chamber for gas and liquid emerging from the restricted passageway.
Reference is now made to the accompanying drawings, in which:~
Figure 1 is an axial section through apparatus according to the present invention;
Figure 2 is a plan view of the housing of the apparatus shown in Figure 1;
Figure 3 is an axial section of the diffuser shown in Figure 1;
Figure 4 is a plan view of the diffuser shown in
Figure 1 and 3;
Figure 5 is an axial sectional view through another embodiment according to the present invention; and
Figure 6 is a schematic section of an activated sludge treatment tank incorporating apparatus according to the present invention.
according accordingto the present invention is generally shown at 10 and includes a cylindrical housing wall 1 1 which houses a diffuser 12.
The diffuser 12 has a cylindrical body 14 having end walls 15, 16 and a peripheral wall 17 also of circular cross-section. A series of apertures 18 are formed in the wall 17 to extend about its circumference, the apertures 18 serving as jets for directing gas from the diffuser toward the housing wall 11.
The diffuser 12 also includes a conduit 20 which projects co-axially from the body 14 in both axial directions. The conduit 20 communicates with the interior of body 14 through apertures 21 so as to be able to supply a gas such as air thereto.
In use one end of the conduit is blanked off and the other end is provided with a flange connector 23 for connecting further conduit (not shown) thereto. In the illustrated embodiment the lower end of conduit 20 is blanked off and the upper end is provided with the flange connector 23.
The diffuser 12 illustrated in Figure 3 is fabricated from polypropylene sheet which is welded together. The end walls 15 and 16 are further spaced apart in this embodiment by a plurality of tubular supports 26 which are secured to end wall 15 only. A removable lid 27 is also
provided to give access to the interior of the body 14 for inspection purposes. Preferably strengthening webs 1 4a circumferentially spaced about the conduit are provided between conduit 20 and body 14.
The diffuser 12 is supported with the housing 11 by means of a support assembly 30 which includes an annular seat 32 which is L-shape in cross-section. The assembly 30 also includes a sleeve 33 which slidingly receives the lower portion of conduit 20. If desired seat 32 may be annular and of flat cross-section in which case the diffuser is provided with an annular depending flange 15a which locates within the seat 32 to restrict lateraldisplacement.
The sleeve 33 and annular seat 32 are connected to one another by a conical wall portion 35 which defines between itself and the lower edge of the housing wall 11 an annular fluid inlet 37. The fluid outlet 34 from housing wall 11 is defined by the upper edge thereof.
The lower end of sleeve 33 is provided with a base plate 38 which, if desired may be bolted to the floor of a tank (not shown) into which the apparatus is to be housed. Base plate 38 is thus provided with bolt holes 38a. The wall portion 35 and base 38 are connected to the cylindrical wall 11 by means of webs 40 spaced circumferentially about the wall portion 35. As seen in Figure 2 three webs 40 are provided. The webs 40 also serve to space the support assembly from the housing wall 11 so that sleeve 33 and annular seat 32 are co-axial with the wall 11. The support assembly 30 also serves to support housing wall 11 via the webs 40.
In the illustrated embodiment, it will be apparent that the diffuser may be lifted axially out of the housing wall 11 which may remain in situ, say at the bottom of a tank. Thus the diffuser may be removed from the tank for servicing and inspection and then returned into the housing wall merely by a lifting and lowering operation. It will be appreciated the wall portion 35 assist in guiding the lower portion of conduit 20 into sleeve 33 when the diffuser is lowered into position.
The sleeve 33 is preferably provided with apertures 41 so that when conduit 20 is lowered into sleeve 33 fluid and debris located therein may be displaced through the apertures. Due to the concentricity of the sleeve 33 and annular seat 32 the diffuser 12 when located in the support assembly 30 is positioned co-axially within housing wall 11.
In use the apparatus is immersed in a liquid and air is pumped into the interior of body 14 via pipe 20. Air is thus expelled from apertures 18 in the form of jets of bubbles of air which project across the restricted passageway 50 defined between the wall of the housing 11 and the annular seat 33 and diffuser wall 17 to impinge against the wall of housing 11. The bubbles emerge upwardly from the outlet 51 of the restricted passageway 50 into the upper portion of the housing wall 11 which is of substantially greater cross-sectional area than passageway 50 and thereby defines an expansion chamber. Accordingly, the air bubbles emerging from the restricted passageway expand rapidly.
The movement of air from the restricted passageway 50 causes liquid to be drawn into the lower portion of the housing 11 through inlet 37.
The passageway 53 defined between conical wall portion 35 of the wall of the housing progressively decreases in cross-sectional area from inlet 37 to the restricted passageway 50 thereby causing the liquid to accelerate as it is moved towards passageway 50.
Due to the cross-sectional expansion on leaving passageway 50 the liquid emerging therefrom tends to rapidly decelerate. The combined effect of gas and liquid emerging from passageway 50 causes violent turbulence of the liquid in the upper portion of the housing wall 11. Liquid and gas then emerge from outlet 34.
Accordingly, the apparatus 10 is ideal for mixing liquids and solids to form suspensions, particularly in cases where mechanical mixers are not suitable. Any suitable gas may be introduced into the liquid through the diffuser 12.
Additionally the apparatus 10 is suitable for use
In the oxidation of organic liquids and suspensions such as sewage. In such an application the apparatus 10 has an additional advantage in that solid material passing through passageway 50 is exposed to the jets of air emerging from apertures 1 8 which facilitate the breaking down of the solid material.
In the above described embodiment the diffuser and housing are detachable from one another. It is envisaged that the diffuser and housing may be fixedly secured to one another, such an embodiment being illustrated in Figure 5. In
Figure 5 parts similar to those shown in Figures 1 to 4 have been designated by similar reference numerals.
In the apparatus 100 shown in Figure 5 the lower wall 1 5 of the diffuser 12 is secured by welding to the upper edge of the conical wall portion 35. The conduit 20 is formed in two separate portions, an upper portion 20a and lower portion 20b which are respectively secured to the upper wall 16 and lower wall 15 of the diffuser 12. The upper wall 16 and lower wall 15 are detachably secured to one another by means of bolts 101 which extend through supports 26. An annular wall 103 which defines the peripheral wall 17 of the diffuser 12 is sandwiched between the upper and lower walls 16 and 1 5 respectively. In order to restrict lateral displacement of the wall 103 walls 16. 15 are provided with annular shoulders 1 6b and 15b respectively.It is intended that the entire apparatus 100 be suspended in the liquid to be agitated and/or aerated by means of the supply pipe (not shown) connected to the upper portion 20a of the conduit; the supply pipe being rigidly attached at a suitable location to the structure of the container containing the liquid.
Thus the apparatus 100 may be raised or lowered as a whole by lifting or lowering the supply pipe.
It is also envisaged that walls 103 having different sized apertures may be provided, replacement of one wall 103 for another having different sized apertures being easily achieved by separation of walls 1 5 and 1 6 of the diffuser.
By way of example an apparatus 10 is shown in situ in Figure 6 in a tank 60 for treating sewage.
The apparatus 10 is located at the centre of tank 60 and untreated sewage is preferably fed by a conduit 61 to a position beneath apparatus 10. In
Figure 5, base plate 38 is provided with supporting legs 38b to space it from the bottom of the tank to enable conduit 61 to be positioned thereunder.
Tank 60 is partitioned around its periphery to define a settlement compartment where clarified effluent overflows into a launder 63 and settled sludge falls toward the base of the tank to be drawn toward the apparatus 10 to be resuspended.
The apparatus is fabricated from a suitable material or materials to suit the liquid in which it is immersed. Normally the diffuser is fabricated in from a suitable plastics material such a polypropylene but the gas apertures can be stainless steel wedgewire or perforated plate or, alternatively, the gas apertures may be holes drilled at regular intervals in polypropylene sheet or some similar plastics material. The outer casing and concial base of the unit can be made in either steel or plastics.
Claims (9)
1. Apparatus for agitating a liquid, the apparatus including a liquid inlet and liquid outlet located above the inlet, a first passageway extending upwardly from the inlet to communicate with a restricted passageway, said first passageway progressively decreasing in crosssectional area toward said restricted passageway, a second passageway extending upwardly from the restricted passageway to the liquid outlet, and gas outlet means for expelling gas into the restricted passageway, the second passageway defining an expansion chamber for gas and liquid emerging from the restricted passageway.
2. Apparatus according to Claim 1 wherein the apparatus includes a housing having a tubular wall which in use is arranged vertically, a gas diffuser housing within the tubular wall, the diffuser and tubular wall having a similar cross-sectional shape and being spaced from one another to define at least a portion of said restricted passageway.
3. Apparatus according to Claim 2 wherein the diffuser is mounted on support means which together with the tubular wall of the housing define said first passageway.
4. Apparatus according to Claims 2 or 3 wherein the upper portion of the tubular wall located above the diffuser defines said second passageway.
5. Apparatus according to Claims 2, 3 or 4 wherein the diffuser is removably mounted on the support means.
6. Apparatus according to Claim 5 wherein the diffuser includes a hollow body having a peripheral wall containing a series of apertures through which gas may be expelled, and a conduit extending axially in both directions from the body.
7. Apparatus according to Claim 6 wherein the support means includes a seat on which the peripheral edge of the body may be mounted and a sleeve for receiving-said conduit, the sleeve and seat being connected by a wall portion which together with the tubular wall defines said first passageway.
8. Apparatus for agitating and aerating liquids substantially as described with reference to and as illustrated in any of the accompanying drawings.
9. A sewage treatment apparatus including a tank for reception of untreated sewage and at least one apparatus according to any preceding claim immersed in said tank.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8100940A GB2069353B (en) | 1980-01-15 | 1981-01-13 | Apparatus for agitating and/or aerating liquids |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8001263 | 1980-01-15 | ||
| GB8100940A GB2069353B (en) | 1980-01-15 | 1981-01-13 | Apparatus for agitating and/or aerating liquids |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2069353A true GB2069353A (en) | 1981-08-26 |
| GB2069353B GB2069353B (en) | 1983-03-09 |
Family
ID=26274140
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8100940A Expired GB2069353B (en) | 1980-01-15 | 1981-01-13 | Apparatus for agitating and/or aerating liquids |
Country Status (1)
| Country | Link |
|---|---|
| GB (1) | GB2069353B (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1984001570A1 (en) * | 1982-10-09 | 1984-04-26 | Peter Robert Tolley | Method and apparatus for treating effluent |
-
1981
- 1981-01-13 GB GB8100940A patent/GB2069353B/en not_active Expired
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1984001570A1 (en) * | 1982-10-09 | 1984-04-26 | Peter Robert Tolley | Method and apparatus for treating effluent |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2069353B (en) | 1983-03-09 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |
Effective date: 19950113 |