CA1057431A - Rotary surface aerators - Google Patents
Rotary surface aeratorsInfo
- Publication number
- CA1057431A CA1057431A CA266,441A CA266441A CA1057431A CA 1057431 A CA1057431 A CA 1057431A CA 266441 A CA266441 A CA 266441A CA 1057431 A CA1057431 A CA 1057431A
- Authority
- CA
- Canada
- Prior art keywords
- blade
- aerator
- plate
- aerator according
- secured
- 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
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
- C02F3/14—Activated sludge processes using surface aeration
- C02F3/16—Activated sludge processes using surface aeration the aerator having a vertical axis
-
- 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
- B01F23/2342—Surface aerating with stirrers near to the liquid surface, e.g. partially immersed, for spraying the liquid in the gas or for sucking gas into the liquid, e.g. using stirrers rotating around a horizontal axis or using centrifugal force
- B01F23/23421—Surface aerating with stirrers near to the liquid surface, e.g. partially immersed, for spraying the liquid in the gas or for sucking gas into the liquid, e.g. using stirrers rotating around a horizontal axis or using centrifugal force the stirrers rotating about a vertical axis
- B01F23/234211—Stirrers thereof
-
- 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
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
ABSTRACT
An aerator comprising a support member in the form of a flat plate which is adapted, when the aerator is in use, to lie in a horizontal plane and to be rotated about its central vertical axis, a plurality of angularly spaced blades secured to the underside of said plate and each extending radially from a central region thereof towards its periphery, each said blade having a maximum depth beneath a horizontal datum at a position intermediate its ends, and being provided with a plate secured to its lower edge and extending on both sides of the blade along at least a portion of that part of the length of the blade between its outer end and the position of maximum depth.
An aerator comprising a support member in the form of a flat plate which is adapted, when the aerator is in use, to lie in a horizontal plane and to be rotated about its central vertical axis, a plurality of angularly spaced blades secured to the underside of said plate and each extending radially from a central region thereof towards its periphery, each said blade having a maximum depth beneath a horizontal datum at a position intermediate its ends, and being provided with a plate secured to its lower edge and extending on both sides of the blade along at least a portion of that part of the length of the blade between its outer end and the position of maximum depth.
Description
1057~
THIS INVENTION concerns a rotary surface aerator of the kind which is adapted to be rotated in the surface of a liquid for the purpose of agitating and aerating same, and particularly, . 5 though by no means exclusively, suitable for use in the aeration of sewage liquors in the so-called activated sludge process. ~ `
. An aerator is known which comprises a support. member in the form of an inverted conical : 10 shell having a plurality of angularly spaced blades : ~ .
.~ secured to its undersi~e and each extending ~:~
`. ~ tangentially from a circular locality at the centre :~
.~ of the support member towards the outer periphery :
thereof, there being a plate secured to the lower edge of each said blade and extending~on.both sides thereof along at least a part of the length of the ~ blade beneath said shell from the outer end of the .
: blade towards the centre of the aerator.
:
The rotation of aerators at high speeds ~ 20 is becoming increasingly popular as means of ~ ~:
:~ reducing the cost of the gear boxes which must be ~ provided between the aerators and the driving motors ~ therefor. This is particularly true in the case of 1 the larger sizes of aerator when the torque to be ~j EF/1405 - 2 - ~
~' :~''"`.' `''`~
214-041 ~ `
,. !,. " ' . . , . . . ` ,` ` . , : ` .
~ ~1)57431 transmitted is such that the gear boxes can account for up to half of the total cost of an aerator installation.
: We have fcund that an aerator as described above, whilst highly satisfactory at low rotational speeds, develops problems at higher speeds, when .: complex power consumption/oxygen tranfer character- .
istics occur, making control extremely difficult . having regard to other variable parameters such ; 10 as the oxygen demand of the liquid being treated . and the depth of immersion of the aerator in the .. surface of the liquid being treated.
'.~, .
~,~ It is an object of the present invention .
.s to provide an aerator capable of being operated at high speeds and without the disadvantages aforesaid.
1 According to the present invention, an .. ~ aerator comprises a support member in the form of ,~ a flat plate which is adapted when the i aerator is in use to lie in a horizontal plane and ~, 20 to be rotated about its central vertical axls, a ~ ' .. l plurality of angularly spaced blades secured to ~ ~' . the underside of said plate and each extending : ~:
. , . ''' '~' `~ EF~405 3 .,, _ _ . ~"
,.' 214-C~I
': ' ' '~ " ' ~ :
: : ' , - ~ . : ' ', ' ` . ~, ~ ' , ~057a~3~
radially from a central region thereof towards its :-periphery, each said blade having a maximum depth beneath a horizontal datum at a position inter-mediate its ends, and being provided with a plate secured to its lower edge and extending on both sides of the blade along at least a portion of that part of the length of the blade between its outer end and the position of maximum depth.
~ :::
. We have found that an aerator embodying the ` 10 invention will perform in a particularly satisfactory manner at higher rotational speeds when baffle means .
., is provided therebeneath for the purposes of preventing rotational flow or swirling of the - ;
liquid being aerated immediately beneath the : ~
position of the aerator. ~ :: ~:
. . '~ ~
s~ Thus, the invention also includes an :
: installation for the aeratlon of a liquid comprising the combination of an aerator as aforesaid with ~ baffle means mounted therebeneath and so arranged .1~ 20 as to prevent rotational flow of the liquid in a -;
region immediately beneath the position of the : aerator. ~ :
~ ; ~: :'' '; ;' '' .
`i The invention will be further apparent from .
the following description with reference to the several figures of the accompanying drawings :~
. EF/1405 .
'" , "' ``: ~ . ., , . . ` :
',',,, ~, ', " . ,~ ' . , " ' , ;' '' ` ;.' " ' , , i 057431 which show, by way of example only~ one form of rotary surface aerator embodying the inventlon.
,, .
Of the drawings:-, Fig. 1 shows a side elevation of the aerator;
'',~
Fig. 2 shows a plan view of the aeratorof Fig. l;
J, Fig. 3 shows a cross-section through the aerator on the line III-III of Fig. 2;
3j ~`~ 10 and Fig. 4 shows a perspective view of the aerator of Fig. 1 in position in an ~ ~
aeration tank with baffle means mounted ~ ;
~' therebeneath.
," . . , ~
Referring now to the drawings, and more ~ 15 particularly Figs. 1 to 3 inclusive, it will be J~ seen that the aerator essentially comprises a support member 10 in the form of a ~lat circular disc, which, when the aerator is in use, lies in a horizontal plane, and which can be rotated by means of a shaft 11 which is secured centrally to ' . ' ' .' EF/1405 _ 5 _ .,., ~`'.' ' ~ ':
~' 214- C41 . :
,-~, - ' .. ' , ' , , ':; ', , , . : ' . : ~ :' .
: ~5743~
:~`
, the disc 10 so as to extend upwardly therefrom.
Extendlng downwardly from the underside of the disc 10 at its centre is a circular boss 12 formed from tube and closed at its lower end by a circular plate 13.
.~`,', . ~
Secured to the underside of the support member 10 are a plurality of angularly spaced , blades 15 each disposed in a vertical plane.
'j As best seen from Fig. 2, each of the blades 15 extends radially and outwardly from the periphery f of the circular boss,12 to terminate at a position lying beyond~the peripheral edge of the support member 10. Each blade 15 is profiled, as best .
seen from Fig. 3, so as to have à maximum depth ~ .
jff ~ ~ : 15; beneath a horizontal datum at a position inter-~! ~ : mediate lts ends, the depth of the blade on either side of this position reducing gradually. As , also best seen from Fig. 3 the upper edge o~ each~
.f ~ ~ blade 15 extends continuously from the periphery 1 20 of the support member 10 in contact with the ,- , underside thereof to the circular boss 12.
f~ Likewise the;inner edge of each blade 15 extends ," ,.
:f ` ~ . continuously downwardly in contact with the perlphery ~ of the boss 12 for a distance not substantially less ~ , ;l 25 than the depth of the boss 12. The outermost edge EF/1405 ' , - 6 - " , '' .~ ~ ' ' , . ' '"' ', 214-C41 ,','.''., ', ' ', . . " ,' ' . ' ":: ' ` ~
.: . ' : , . ,, :
: L057431 ; of each blade 15 is of substantially less height than the inner edge thereof.
, Secured to the lower edge of each blade 15 between the position of maximum depth thereof and the outer end of the blade is a plate 16 which extends on both sides of the blade normal thereto, as clearly seen from Figs. 1 and 2.
: : ' . ' ~ ..
In use, the aerator is rotated in the - -, surface of a liquid which is to be agitated and aerated. It will be understood that liquid is thrown outwardly by centrifugal action through the duct ~defined on the leading side of each ~; ~lade with~respect to the direction of rotation y the support membar 10, blade 15 and plate 16 and that air is drawn down the duct on the trailing ide of each blade with respect to the dlreotion of rotation and defined by the same parts. This air is drawn lnto the region of maximum turbulence thus ~nsuring a good transfer of oxygen to the liquid ~;; 20 ~eing aerated.
~ 1 :
1~ When the aerator is to be rotated at ~1~ he higher end of its useful speed range, as is ; )referred, it is desirable to ~rovide baffle ; ~-.
EP/~o5 - 7 -., . '~' .i~
.' "~ ' ' ' ' ' , ' ~ ' , ;: "
.... . . . . . .
~S743~
,, ., j means to prevent rotational flow or swi~ling of the liquid at a position immediately beneath the aerator. As can clearly be seen from Fig. 4, such baffle means may conven~ently be comprised by four plates lying in vertical planes and forming a cross whose axis is coincident with the rotary axis of the aerator.
~' . ~ ~ ~
~ Tests with aerators having the contruction `~ described above have shown that there is a simple ;
relationship between oxygen transfer and power 1 consumption regardless of speed of rotation and depth of immersion, thus making control of the aerator on site particularIy straightforward. ~; ;
;-s ~ ;
?, 1~ We have also observed that aerators ~
embodying the present invention do not have a ~ ;
great tendency to cause the liquid being aerated ~to surge, and thus have a consequent~tendency to allow the power input to remain constant during ~;~ operation.
. .
20 ` It will be appreciated that it is not intended to limit the invention to the above example only, many variations, such as might ~l ~ readily occur to one skilled in the art, being possible without departing from the scope thereof, EF/14~5 as defined in the appended claims.
', ' .
~.2i4-04~ ; , Thus, for example, the blades 15 need .~ not extend from the periphery of a circular boss ; and may all meet at the vertical axis of the : machine.
:, Again, for example, the plates 16 need not extend from the outer ends of the blades 15 but ~rom positions inwardly of such ends.
., '':,~-' Yet again, for example, the blades 15 need not extend outwardly beyond the periphery of ~ .
the disc 10 but may terminate at the periphery .l or even at positions radially and inwardly thereo~.
-,~ ~
~ Still again, for example, the disc 10 ~ ~ may be replaced by a plate of other than circular :
. shape. I
.
~; . . : '' '' ' ;:! ~
¦ EF/ 1405 _ ., . .
~, ~:
2i4-041 ..
. : ... .. . . .
THIS INVENTION concerns a rotary surface aerator of the kind which is adapted to be rotated in the surface of a liquid for the purpose of agitating and aerating same, and particularly, . 5 though by no means exclusively, suitable for use in the aeration of sewage liquors in the so-called activated sludge process. ~ `
. An aerator is known which comprises a support. member in the form of an inverted conical : 10 shell having a plurality of angularly spaced blades : ~ .
.~ secured to its undersi~e and each extending ~:~
`. ~ tangentially from a circular locality at the centre :~
.~ of the support member towards the outer periphery :
thereof, there being a plate secured to the lower edge of each said blade and extending~on.both sides thereof along at least a part of the length of the ~ blade beneath said shell from the outer end of the .
: blade towards the centre of the aerator.
:
The rotation of aerators at high speeds ~ 20 is becoming increasingly popular as means of ~ ~:
:~ reducing the cost of the gear boxes which must be ~ provided between the aerators and the driving motors ~ therefor. This is particularly true in the case of 1 the larger sizes of aerator when the torque to be ~j EF/1405 - 2 - ~
~' :~''"`.' `''`~
214-041 ~ `
,. !,. " ' . . , . . . ` ,` ` . , : ` .
~ ~1)57431 transmitted is such that the gear boxes can account for up to half of the total cost of an aerator installation.
: We have fcund that an aerator as described above, whilst highly satisfactory at low rotational speeds, develops problems at higher speeds, when .: complex power consumption/oxygen tranfer character- .
istics occur, making control extremely difficult . having regard to other variable parameters such ; 10 as the oxygen demand of the liquid being treated . and the depth of immersion of the aerator in the .. surface of the liquid being treated.
'.~, .
~,~ It is an object of the present invention .
.s to provide an aerator capable of being operated at high speeds and without the disadvantages aforesaid.
1 According to the present invention, an .. ~ aerator comprises a support member in the form of ,~ a flat plate which is adapted when the i aerator is in use to lie in a horizontal plane and ~, 20 to be rotated about its central vertical axls, a ~ ' .. l plurality of angularly spaced blades secured to ~ ~' . the underside of said plate and each extending : ~:
. , . ''' '~' `~ EF~405 3 .,, _ _ . ~"
,.' 214-C~I
': ' ' '~ " ' ~ :
: : ' , - ~ . : ' ', ' ` . ~, ~ ' , ~057a~3~
radially from a central region thereof towards its :-periphery, each said blade having a maximum depth beneath a horizontal datum at a position inter-mediate its ends, and being provided with a plate secured to its lower edge and extending on both sides of the blade along at least a portion of that part of the length of the blade between its outer end and the position of maximum depth.
~ :::
. We have found that an aerator embodying the ` 10 invention will perform in a particularly satisfactory manner at higher rotational speeds when baffle means .
., is provided therebeneath for the purposes of preventing rotational flow or swirling of the - ;
liquid being aerated immediately beneath the : ~
position of the aerator. ~ :: ~:
. . '~ ~
s~ Thus, the invention also includes an :
: installation for the aeratlon of a liquid comprising the combination of an aerator as aforesaid with ~ baffle means mounted therebeneath and so arranged .1~ 20 as to prevent rotational flow of the liquid in a -;
region immediately beneath the position of the : aerator. ~ :
~ ; ~: :'' '; ;' '' .
`i The invention will be further apparent from .
the following description with reference to the several figures of the accompanying drawings :~
. EF/1405 .
'" , "' ``: ~ . ., , . . ` :
',',,, ~, ', " . ,~ ' . , " ' , ;' '' ` ;.' " ' , , i 057431 which show, by way of example only~ one form of rotary surface aerator embodying the inventlon.
,, .
Of the drawings:-, Fig. 1 shows a side elevation of the aerator;
'',~
Fig. 2 shows a plan view of the aeratorof Fig. l;
J, Fig. 3 shows a cross-section through the aerator on the line III-III of Fig. 2;
3j ~`~ 10 and Fig. 4 shows a perspective view of the aerator of Fig. 1 in position in an ~ ~
aeration tank with baffle means mounted ~ ;
~' therebeneath.
," . . , ~
Referring now to the drawings, and more ~ 15 particularly Figs. 1 to 3 inclusive, it will be J~ seen that the aerator essentially comprises a support member 10 in the form of a ~lat circular disc, which, when the aerator is in use, lies in a horizontal plane, and which can be rotated by means of a shaft 11 which is secured centrally to ' . ' ' .' EF/1405 _ 5 _ .,., ~`'.' ' ~ ':
~' 214- C41 . :
,-~, - ' .. ' , ' , , ':; ', , , . : ' . : ~ :' .
: ~5743~
:~`
, the disc 10 so as to extend upwardly therefrom.
Extendlng downwardly from the underside of the disc 10 at its centre is a circular boss 12 formed from tube and closed at its lower end by a circular plate 13.
.~`,', . ~
Secured to the underside of the support member 10 are a plurality of angularly spaced , blades 15 each disposed in a vertical plane.
'j As best seen from Fig. 2, each of the blades 15 extends radially and outwardly from the periphery f of the circular boss,12 to terminate at a position lying beyond~the peripheral edge of the support member 10. Each blade 15 is profiled, as best .
seen from Fig. 3, so as to have à maximum depth ~ .
jff ~ ~ : 15; beneath a horizontal datum at a position inter-~! ~ : mediate lts ends, the depth of the blade on either side of this position reducing gradually. As , also best seen from Fig. 3 the upper edge o~ each~
.f ~ ~ blade 15 extends continuously from the periphery 1 20 of the support member 10 in contact with the ,- , underside thereof to the circular boss 12.
f~ Likewise the;inner edge of each blade 15 extends ," ,.
:f ` ~ . continuously downwardly in contact with the perlphery ~ of the boss 12 for a distance not substantially less ~ , ;l 25 than the depth of the boss 12. The outermost edge EF/1405 ' , - 6 - " , '' .~ ~ ' ' , . ' '"' ', 214-C41 ,','.''., ', ' ', . . " ,' ' . ' ":: ' ` ~
.: . ' : , . ,, :
: L057431 ; of each blade 15 is of substantially less height than the inner edge thereof.
, Secured to the lower edge of each blade 15 between the position of maximum depth thereof and the outer end of the blade is a plate 16 which extends on both sides of the blade normal thereto, as clearly seen from Figs. 1 and 2.
: : ' . ' ~ ..
In use, the aerator is rotated in the - -, surface of a liquid which is to be agitated and aerated. It will be understood that liquid is thrown outwardly by centrifugal action through the duct ~defined on the leading side of each ~; ~lade with~respect to the direction of rotation y the support membar 10, blade 15 and plate 16 and that air is drawn down the duct on the trailing ide of each blade with respect to the dlreotion of rotation and defined by the same parts. This air is drawn lnto the region of maximum turbulence thus ~nsuring a good transfer of oxygen to the liquid ~;; 20 ~eing aerated.
~ 1 :
1~ When the aerator is to be rotated at ~1~ he higher end of its useful speed range, as is ; )referred, it is desirable to ~rovide baffle ; ~-.
EP/~o5 - 7 -., . '~' .i~
.' "~ ' ' ' ' ' , ' ~ ' , ;: "
.... . . . . . .
~S743~
,, ., j means to prevent rotational flow or swi~ling of the liquid at a position immediately beneath the aerator. As can clearly be seen from Fig. 4, such baffle means may conven~ently be comprised by four plates lying in vertical planes and forming a cross whose axis is coincident with the rotary axis of the aerator.
~' . ~ ~ ~
~ Tests with aerators having the contruction `~ described above have shown that there is a simple ;
relationship between oxygen transfer and power 1 consumption regardless of speed of rotation and depth of immersion, thus making control of the aerator on site particularIy straightforward. ~; ;
;-s ~ ;
?, 1~ We have also observed that aerators ~
embodying the present invention do not have a ~ ;
great tendency to cause the liquid being aerated ~to surge, and thus have a consequent~tendency to allow the power input to remain constant during ~;~ operation.
. .
20 ` It will be appreciated that it is not intended to limit the invention to the above example only, many variations, such as might ~l ~ readily occur to one skilled in the art, being possible without departing from the scope thereof, EF/14~5 as defined in the appended claims.
', ' .
~.2i4-04~ ; , Thus, for example, the blades 15 need .~ not extend from the periphery of a circular boss ; and may all meet at the vertical axis of the : machine.
:, Again, for example, the plates 16 need not extend from the outer ends of the blades 15 but ~rom positions inwardly of such ends.
., '':,~-' Yet again, for example, the blades 15 need not extend outwardly beyond the periphery of ~ .
the disc 10 but may terminate at the periphery .l or even at positions radially and inwardly thereo~.
-,~ ~
~ Still again, for example, the disc 10 ~ ~ may be replaced by a plate of other than circular :
. shape. I
.
~; . . : '' '' ' ;:! ~
¦ EF/ 1405 _ ., . .
~, ~:
2i4-041 ..
. : ... .. . . .
Claims (15)
1. An aerator comprising a support member in the form of a flat plate which is adapted, when the aerator is in use, to lie in a horizontal plane and to be rotated about its central vertical axis, a plurality of angularly spaced blades secured to the underside of said plate and each extending radially from a central region thereof towards its periphery, each said blade having a maximum depth beneath a horizontal datum at a position inter-mediate its ends, and being provided with a plate secured to its lower edge and extending on both sides of the blade along at least a portion of that part of the length of the blade between its outer end and the position of maximum depth.
2, An aerator according to claim 1 wherein said plate is in the form of a circular disc.
3. An aerator according to claim 2 wherein each said blade extends outwardly beyond the periphery of said disc.
4. An aerator according to claim 1 wherein each said blade lies in a vertical plane and has its inner end abutting the periphery of a circular boss which depends from the underside of the support plate.
5. An aerator according to claim 3 wherein each said blade lies in a vertical plane and has its inner end abutting the periphery of a circular boss which depends from the underside of the support plate.
6. An aerator according to claim 1 wherein the depth of the blade reduces gradually to either side of the position of maximum depth.
7. An aerator according to claim 5 wherein the depth of the blade reduces gradually to either side of the position of maximum depth.
8. An aerator according to claim 6 wherein the outer edge of each blade is of less height than the inner edge thereof.
9. An aerator according to claim 7 wherein the outer edge of each blade is of less height than the inner edge thereof.
10. An aerator according to claim 1 wherein each said plate which is secured to the lower edge of a blade is normal to the blade.
11. An aerator according to claim 9 wherein each said plate which is secured to the lower edge of a blade is normal to the blade.
12. An aerator according to claim 1 wherein each said plate secured to the lower edge of a blade extends continuously from the outer edge of the blade to the position of maximum depth.
13. An aerator according to claim 11 wherein each said plate secured to the lower edge of a blade extends continuously from the outer edge of the blade to the position of maximum depth,
14. An installation for the aeration of a liquid comprising a vessel adapted to contain the liquid to be aerated, an aerator according to claim 1 mounted over the vessel and adapted to be rotated in the surface of liquid contained within the vessel and baffle means situated beneath the aerator to prevent rotational flow or swirling of liquid immediately beneath the aerator.
15. An installation according to claim 14 wherein said baffle is comprised by four plates lying in a vertical plane and forming a cross whose axis is coincident with the rotary axis of the aerator.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB92776A GB1502742A (en) | 1976-01-10 | 1976-01-10 | Rotary surface aerators |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1057431A true CA1057431A (en) | 1979-06-26 |
Family
ID=9712972
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA266,441A Expired CA1057431A (en) | 1976-01-10 | 1976-11-24 | Rotary surface aerators |
Country Status (19)
| Country | Link |
|---|---|
| JP (1) | JPS5285761A (en) |
| AU (1) | AU497934B2 (en) |
| BE (1) | BE849315A (en) |
| BR (1) | BR7700080A (en) |
| CA (1) | CA1057431A (en) |
| CH (1) | CH617103A5 (en) |
| DE (1) | DE2657683C2 (en) |
| DK (1) | DK147234C (en) |
| ES (1) | ES454343A1 (en) |
| FR (1) | FR2337580A1 (en) |
| GB (1) | GB1502742A (en) |
| HK (1) | HK8982A (en) |
| IE (1) | IE44240B1 (en) |
| IN (1) | IN143958B (en) |
| IT (1) | IT1065838B (en) |
| LU (1) | LU76361A1 (en) |
| NL (1) | NL166448C (en) |
| NZ (1) | NZ182762A (en) |
| ZA (1) | ZA767045B (en) |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| BE884216A (en) * | 1980-07-08 | 1980-11-03 | Haegeman Johny H | APPARATUS FOR MIXING GAS WITH LIQUID OR REVERSE AND FOR DEGASSIFICATION OF A LIQUID |
| JP5704928B2 (en) * | 2011-01-11 | 2015-04-22 | 株式会社環境測定サービス | Water circulation device |
| CN110228858A (en) * | 2019-06-14 | 2019-09-13 | 中国石油大学(华东) | A kind of rotary type uniform aeration device |
| CN113716824B (en) * | 2021-11-03 | 2022-01-21 | 苏州飞驰环保科技股份有限公司 | Reinforced sludge aeration treatment device |
Family Cites Families (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE473404C (en) * | 1925-05-24 | 1929-03-16 | Ig Farbenindustrie Ag | Stirring and mixing device |
| FR88774E (en) * | 1962-05-07 | 1967-06-07 | ||
| US3814395A (en) * | 1964-02-27 | 1974-06-04 | Kaelin J R | Aeration plant for clarifying sewage and waste effluents |
| DE1557138B2 (en) * | 1966-02-10 | 1973-08-23 | Metallgesellschaft AG, 6000 Frank fürt | DEVICE FOR GASIFYING LIQUIDS |
| DE1557181C3 (en) * | 1966-11-21 | 1975-03-20 | Passavant - Werke Michelbacher Huette, 6209 Aarbergen | Device for introducing gases into liquids |
| AT281704B (en) * | 1968-11-21 | 1970-05-25 | Passavant Werke | Centrally symmetrical aeration basin with vertical axis surface aerator |
| CH495293A (en) * | 1969-05-19 | 1970-08-31 | Kaelin J R | Vertical axis aerator for aerating liquids |
| DE2140283C3 (en) * | 1971-08-06 | 1979-07-26 | Simon-Hartley Ltd., Stoke-On-Trent, Staffordshire (Grossbritannien) | Vertical-axis aerator agitator for liquids, slurries or the like |
| BE791671A (en) * | 1971-11-23 | 1973-03-16 | Kaelin J R | AERATION CENTRIFUGE OF THE SURFACE OF AN ACTIVE SLUDGE BASIN |
| GB1402400A (en) * | 1973-05-09 | 1975-08-06 | Hartley Simon Ltd | Aerators |
-
1976
- 1976-01-10 GB GB92776A patent/GB1502742A/en not_active Expired
- 1976-11-24 CA CA266,441A patent/CA1057431A/en not_active Expired
- 1976-11-24 ZA ZA767045A patent/ZA767045B/en unknown
- 1976-11-24 IN IN2100/CAL/76A patent/IN143958B/en unknown
- 1976-11-26 AU AU20035/76A patent/AU497934B2/en not_active Expired
- 1976-11-30 NZ NZ18276276A patent/NZ182762A/en unknown
- 1976-12-09 CH CH1548376A patent/CH617103A5/de not_active IP Right Cessation
- 1976-12-10 LU LU76361A patent/LU76361A1/xx unknown
- 1976-12-10 BE BE173185A patent/BE849315A/en not_active IP Right Cessation
- 1976-12-17 ES ES454343A patent/ES454343A1/en not_active Expired
- 1976-12-20 IE IE2791/76A patent/IE44240B1/en not_active IP Right Cessation
- 1976-12-20 DE DE2657683A patent/DE2657683C2/en not_active Expired
- 1976-12-23 NL NL7614321A patent/NL166448C/en not_active IP Right Cessation
- 1976-12-23 FR FR7638857A patent/FR2337580A1/en active Granted
- 1976-12-24 IT IT3087976A patent/IT1065838B/en active
-
1977
- 1977-01-07 DK DK6077A patent/DK147234C/en not_active IP Right Cessation
- 1977-01-07 BR BR7700080A patent/BR7700080A/en unknown
- 1977-01-10 JP JP184477A patent/JPS5285761A/en active Granted
-
1982
- 1982-02-25 HK HK8982A patent/HK8982A/en unknown
Also Published As
| Publication number | Publication date |
|---|---|
| LU76361A1 (en) | 1977-06-08 |
| NL166448C (en) | 1981-08-17 |
| DK6077A (en) | 1977-07-11 |
| BR7700080A (en) | 1977-09-20 |
| JPS5636976B2 (en) | 1981-08-27 |
| FR2337580A1 (en) | 1977-08-05 |
| IE44240L (en) | 1977-07-10 |
| AU497934B2 (en) | 1979-01-25 |
| IT1065838B (en) | 1985-03-04 |
| IE44240B1 (en) | 1981-09-23 |
| DK147234C (en) | 1984-10-29 |
| IN143958B (en) | 1978-03-04 |
| GB1502742A (en) | 1978-03-01 |
| JPS5285761A (en) | 1977-07-16 |
| DE2657683C2 (en) | 1985-07-11 |
| DK147234B (en) | 1984-05-21 |
| DE2657683A1 (en) | 1977-07-14 |
| AU2003576A (en) | 1978-06-01 |
| NL7614321A (en) | 1977-07-12 |
| FR2337580B1 (en) | 1981-07-17 |
| NZ182762A (en) | 1978-11-13 |
| ZA767045B (en) | 1977-10-26 |
| BE849315A (en) | 1977-04-01 |
| CH617103A5 (en) | 1980-05-14 |
| HK8982A (en) | 1982-03-05 |
| ES454343A1 (en) | 1978-03-16 |
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