CA1167029A - Rotating-arm depending articulated paddle agitators operating in a water treatment basin - Google Patents
Rotating-arm depending articulated paddle agitators operating in a water treatment basinInfo
- Publication number
- CA1167029A CA1167029A CA000373052A CA373052A CA1167029A CA 1167029 A CA1167029 A CA 1167029A CA 000373052 A CA000373052 A CA 000373052A CA 373052 A CA373052 A CA 373052A CA 1167029 A CA1167029 A CA 1167029A
- Authority
- CA
- Canada
- Prior art keywords
- blade
- basin
- circulating apparatus
- blades
- water
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D21/00—Separation of suspended solid particles from liquids by sedimentation
- B01D21/18—Construction of the scrapers or the driving mechanisms for settling tanks
-
- 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
-
- 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
- B01F27/051—Stirrers characterised by their elements, materials or mechanical properties
- B01F27/054—Deformable stirrers, e.g. deformed by a centrifugal force applied during operation
-
- 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
-
- 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
- C02F3/1284—Mixing devices
-
- 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
-
- 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
-
- 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)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Mixers Of The Rotary Stirring Type (AREA)
- Activated Sludge Processes (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Processing Of Meat And Fish (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
- Biological Treatment Of Waste Water (AREA)
- Grinding-Machine Dressing And Accessory Apparatuses (AREA)
- Polarising Elements (AREA)
- Water Treatment By Sorption (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
Abstract of the Disclosure Circulating apparatus for water treatment basins has at least one blade immersed into the contents of the basin and supported by a transportable structure above the basin.
The blade is suspended for yieldable swinging movement and preferably is subdivided along its width into a plurality of partial blades which swing independently relative to each other.
The blade is suspended for yieldable swinging movement and preferably is subdivided along its width into a plurality of partial blades which swing independently relative to each other.
Description
1 ~67~2g CIRCULATING APPA~TUS FOR ~ATER TREATMENT BASINS
Bac]cground of the Invention This invention relates to circulating apparatus for water treatment basins and more particularly to mixing basins and/or aerating basins having at least one blade immersing into the basin contents and supported by a structure transportable above the basin.
Apparatus of this type is disclosed in West German Patent No. 16 09 004 granted on July 15, 1976 to A. Schreiber, in the form of a bubble aerator provided at the bottom of the basin. A rigidly mounted transport blade extends across substantially the entire width of the basin and ensures a circulation of the basin contents, whereby the upwardly moving path of the bubbles is lengthened as aerated and unaerated quantities of water are mixed together to prevent sludge deposits.
Difficulties have been encountered in starting up and in braking or stopping such circulating apparatus because extremely strong forces then come into action due to the acceleration or decelera-tion of the water. For this reason circulating apparatus which is gradually started has been employed heretofore. However, such apparatus is expensive and prone to malfunctions and does not prevent overloading of the motor and the transport blade securing means since it is a positive control system. Furthermore, it does not solve the problem of the acting forces when the bridge is stopped. These problems are further aggravated by the fact that, particularly in circular basins, the acting forces are not distributed uniformly across the width of the transport blade.
Summary of the Invention An object of this invention is to provide circulating apparatus of the type referred to above in which the starting and braking, even without a starting circuit, does not lead to :~ ~fi'702~
overloading of the transport blade, its securing means and its drive means, and in which it is possible to take into consideration flow conditions which are not uniform across the width of the basin.
In accordance with this invention circulating apparatus of the type referred to above is provided with a blade which is suspended for swinging movement or is formed of a construction which is yieldable. The blade can thus automatically escape the forces of the current during starting and also during braking, whereby the influence of forces acting upon the blade suspension means and the bridge drive means is prevented. Where the blade is supported for movement about a horizontal axis the blade, which is loaded downwardly by its weight, exerts a transport action upon the water in its upward pivoted position, and to the degree to which the water velocity adapts itself to the speed of travel, the blade sinks down into its normal operating position, so that it fills the full cross sectional depth of the basin and develops its full transport action.
In accordance with a further embodiment of our invention, the blade is subdivided along its width into a plurality of partial blades which are suspended independently of each other.
By this means, it is possible to provide particularly good adaptation to different flow conditions and resistance forces across the blade width, such as occurs particularly in circular basins. The different peripheral velocities in circular basins can be taken into consideration by giving the partial blades located radially farther outwardly a higher weight relative to the effective surface than those located farther inwardly.
Another unexpected advantage in our invention is that it has been discovered that, in the case of a blade suspended for swinging movement about a horizonlal axis, not only a circulation ~ 16 7~
in the direction of travel of the brldge is obtained, but a very desirable cross-current occurs, which leads to a thorough mixing of the llquid transversely of the basin. It has been observed that, in a circular basin, in the radially inner region of the blade or partial blade a current occurs in front of the blade which is directed radially and inwardly parallel to the blade while a corresponding current is directed radially and ouk~ardly behind the blade. By this means the air bubbles ascending from the bottom of the basin are also diverted corres-pondingly radially inwardly and outwardly, respectively. Aparticularly thorough mixing of aerated and unaerated water is thus achieved in this manner. The subdivision and swinging suspension of the blade also provides advantages in the assembly, operation and maintenance of the apparatus. For inspection work the blade or each partial blade can be pivoted upwardly in an extremely simple manner. Also, individual partial blades can be dismantled separately. When the bridge is stopped the blade or partial blade swings in the opposite direction due to the forward flow of the water, whereby the action of forces upon the blade suspension means and the bridge drive means is also prevented while the blade is in this position.
A further advantage in our improved apparatus is that by providing blade sections or partial blades which are independently swingable relative to each other they are at least intermittently connected to each other and may have a particular, V-shaped or curved, profile. Also, the horizontal pivot axis of the blade or of the partial blade may be angled obli~uely to the direction of travel of the ~ridge. By these measures currents transversely or radially of the basin can be generated deliberately and the circulation can be improved or sludge deposits in the center of the basin can be prevented by this means.
~ ~6702g The invention can also be carried out by attaching the blades or partial blades to vertical axes. In this case the return force produced by the entrainment of the basin contents can be exerted by suitable means such as springs. The return force may also be generated by the blade itself, by making the latter of flexible material, at least in the region near the axis, and attaching it rigidly to the axis. Also, the blades may be articulated for free swinging movement relative to the axes and inclined relative to the vertical. The vertical plane extending through this inclined axis is placed generally trans-versely to the direction of travel whereby the center of gravity of the blade which moves out of this plane upon deflection generates a return moment of a value similar to that of a suspension from a horizontal axis.
The invention may be applied not only to circular and annular basins, but also to so-called arena basins which have more or less long straight sections. The apparatus for circulating the basin contents according to our invention may also be used in square or rectangular basins in which the blades extend across the entire cross-section only intermittently.
The invention is described more fully hereinafter with re-ference to the accompanying drawings, in which Figs. 7 and 8 are shown on the sheet of drawings having Figs. 3 and 4 thereon and wherein:
FIG. 1 is a sectional view showing a circular basin with circulating apparatus according to our invention;
FIG. 2 is a plan view of the apparatus shown in FIG. l;
FIG. 3 is a side elevational view showing the circulating apparatus in side elevation with the basin being shown in section;
FIG. 4 is a fragmental perspective view showing a detail of the circulating apparatus;
FIG. 5 is a side elevational view showing another form of our circulating apparatus;
FIG. 6 is a plan view of the apparatus shown in FIG. 5;
02~
FIG. 7 is a fragmental sectional view showing the partial blade as being V-shaped;
FIG. 8 is a fragmental sectional view showing the partial blade as having a curved profilei FIG. 9 is a fragmental view showing adjacent partial blades connected together by flexible members; and FIG. 10 is a fragmental view showing the blades as being subdivided in height into two or more sections.
Referring now to FIGS. 1 to 3 we show a circular basin 10 having a central column 12. Annular aerating pipes 13 are laid on the bottom of the basin 10 from which air bubbles 14 ascend.
A transportable bridge 15 is mounted for pivotal movement on the column 12 by means of a pivot bearing 16 and is mounted for movement on the basin crest 18 by means of a carriage 17.
Carried by the bridge 15 above the water level is a horizontal axis 20 on which four juxtaposed blades 19 are suspended for free swinging movement. When the bridge 15 is set in rotation in the direction of the arrow 15' by its drive motor (not shown), the bl.~des 19 exert a shear force upon the water and are them-selves pivoted backwardly and upwardly by the resistance of thewater into the starting position 19' illustrated in FIG. 3. The drive motor for the bridge 15 can therefore be started up with full speed immediately, because overloading of the motor, for the bridge and of the blade suspension means is prevented by the automatic escape of the blades. Progressively as the flow velocity of the water increases, the blades 19 swing back into their normal working position indicated at 19'' in FIG. 3. When the bridye 15 is stopped the blades 19 can escape from the water, which initially continues to flow, by swinging in the opposite direction.
The circulation of the water in the peripheral direction of the basin generated by the blades causes the air bubbles from 1 lS 7~29 the pipes 13 to ascend obliquely with a lengthened path in the water, as indicated at 21 in FIG. 3. Due to the swingable arrangement of the blades 19, an additional radial circulation of the water in the radially inner basin region occurs unexpectedly.
That ls, as shown by the arrows 22 in FIG. 2, a radially inwardly directed current is created in front of the blades 19 in the direction of travel and a radially outwardly directed current is created behind the blades. By this means the ascending air bubbles are also correspondingly diverted alternately radially inwardly and outwardly.
In circular basins the speed of the bridge 15, and also correspondingly the resistance exerted by the water, is greater on the outside than on the inside, so that upon starting up, the blades 19 located farther outwardly are pivoted into a higher position than the inner blades, as shown in FIG. 1. To prevent the escape of too much water through the triangular gaps pro-duced between adjacent blades and consequently impair the transport effect, we provide partition walls 23 at the vertical edges of the blades 19, as shown in FIG. 4. The partition walls 23 project at right angles to the surface of the blade 19 in position to bridge the triangular openings defined between adjacent blades 19.
In the embodiment illustrated in FIGS. 2 to 4 the axial center of the bridge 15 is oriented whereby it extends radially relative to the basin 10. The horizontal swing axis 20 of the blades is however arranged staggered with reference to the axial center of the bridge 15 and is also oriented parallel to the radially extending axis of the bridge 15. The swing axis 20 may also be positioned obliquely relative to the axial center of the bridge 15. By this means additional radial components of the circulating current can be generated deliberately in order to prevent sludge deposits in the center of the basin 10 or to ~ ~ 67029 improve the aeration effect by increased transverse exchange.
Similar effects can be achieved by profiling the blades 19 to provide V-shaped blades or a ploughshare-like curvature for the blades 19. The swing axis 20 may also be prolonged inwardly beyond the center of the basin and carry one or more additional blades 19 on the other side of the column 12.
The adjacent partial blades or blade sections 19 may be connected together by chains 30, cables or the like in order to limit the extent of their pivoting relative to each other.
Rigid connecting devices, such as bolts, may also be provided for the only intermittent connection of adjacent blades.
A further modification of the invention is to provide blades which are subdivided in height into two or more sections articulately connected to each other. Instead of this, or additionally, the blades or their sections may consist of flexible material.
In the circulating apparatus shown in FIGS. 5 and 6 the outer blades 24 are attached to vertically inclined swing axes 25 so that their center of gravity moves upwardly when they swing out. The innermost blade 26 is attached rigidly to a vertical support bar 27 and consists of flexible material which gives the blade 26 an adequately powerful return force for the entrainment of the basin contents. The swing axes 25 and the support bar 27 are attached to the bridge 15, so that they extend in a radial vertical plane. In order to improve the stability of the swing axes 25, they may be additionally braced by means of brackets 28.
Bac]cground of the Invention This invention relates to circulating apparatus for water treatment basins and more particularly to mixing basins and/or aerating basins having at least one blade immersing into the basin contents and supported by a structure transportable above the basin.
Apparatus of this type is disclosed in West German Patent No. 16 09 004 granted on July 15, 1976 to A. Schreiber, in the form of a bubble aerator provided at the bottom of the basin. A rigidly mounted transport blade extends across substantially the entire width of the basin and ensures a circulation of the basin contents, whereby the upwardly moving path of the bubbles is lengthened as aerated and unaerated quantities of water are mixed together to prevent sludge deposits.
Difficulties have been encountered in starting up and in braking or stopping such circulating apparatus because extremely strong forces then come into action due to the acceleration or decelera-tion of the water. For this reason circulating apparatus which is gradually started has been employed heretofore. However, such apparatus is expensive and prone to malfunctions and does not prevent overloading of the motor and the transport blade securing means since it is a positive control system. Furthermore, it does not solve the problem of the acting forces when the bridge is stopped. These problems are further aggravated by the fact that, particularly in circular basins, the acting forces are not distributed uniformly across the width of the transport blade.
Summary of the Invention An object of this invention is to provide circulating apparatus of the type referred to above in which the starting and braking, even without a starting circuit, does not lead to :~ ~fi'702~
overloading of the transport blade, its securing means and its drive means, and in which it is possible to take into consideration flow conditions which are not uniform across the width of the basin.
In accordance with this invention circulating apparatus of the type referred to above is provided with a blade which is suspended for swinging movement or is formed of a construction which is yieldable. The blade can thus automatically escape the forces of the current during starting and also during braking, whereby the influence of forces acting upon the blade suspension means and the bridge drive means is prevented. Where the blade is supported for movement about a horizontal axis the blade, which is loaded downwardly by its weight, exerts a transport action upon the water in its upward pivoted position, and to the degree to which the water velocity adapts itself to the speed of travel, the blade sinks down into its normal operating position, so that it fills the full cross sectional depth of the basin and develops its full transport action.
In accordance with a further embodiment of our invention, the blade is subdivided along its width into a plurality of partial blades which are suspended independently of each other.
By this means, it is possible to provide particularly good adaptation to different flow conditions and resistance forces across the blade width, such as occurs particularly in circular basins. The different peripheral velocities in circular basins can be taken into consideration by giving the partial blades located radially farther outwardly a higher weight relative to the effective surface than those located farther inwardly.
Another unexpected advantage in our invention is that it has been discovered that, in the case of a blade suspended for swinging movement about a horizonlal axis, not only a circulation ~ 16 7~
in the direction of travel of the brldge is obtained, but a very desirable cross-current occurs, which leads to a thorough mixing of the llquid transversely of the basin. It has been observed that, in a circular basin, in the radially inner region of the blade or partial blade a current occurs in front of the blade which is directed radially and inwardly parallel to the blade while a corresponding current is directed radially and ouk~ardly behind the blade. By this means the air bubbles ascending from the bottom of the basin are also diverted corres-pondingly radially inwardly and outwardly, respectively. Aparticularly thorough mixing of aerated and unaerated water is thus achieved in this manner. The subdivision and swinging suspension of the blade also provides advantages in the assembly, operation and maintenance of the apparatus. For inspection work the blade or each partial blade can be pivoted upwardly in an extremely simple manner. Also, individual partial blades can be dismantled separately. When the bridge is stopped the blade or partial blade swings in the opposite direction due to the forward flow of the water, whereby the action of forces upon the blade suspension means and the bridge drive means is also prevented while the blade is in this position.
A further advantage in our improved apparatus is that by providing blade sections or partial blades which are independently swingable relative to each other they are at least intermittently connected to each other and may have a particular, V-shaped or curved, profile. Also, the horizontal pivot axis of the blade or of the partial blade may be angled obli~uely to the direction of travel of the ~ridge. By these measures currents transversely or radially of the basin can be generated deliberately and the circulation can be improved or sludge deposits in the center of the basin can be prevented by this means.
~ ~6702g The invention can also be carried out by attaching the blades or partial blades to vertical axes. In this case the return force produced by the entrainment of the basin contents can be exerted by suitable means such as springs. The return force may also be generated by the blade itself, by making the latter of flexible material, at least in the region near the axis, and attaching it rigidly to the axis. Also, the blades may be articulated for free swinging movement relative to the axes and inclined relative to the vertical. The vertical plane extending through this inclined axis is placed generally trans-versely to the direction of travel whereby the center of gravity of the blade which moves out of this plane upon deflection generates a return moment of a value similar to that of a suspension from a horizontal axis.
The invention may be applied not only to circular and annular basins, but also to so-called arena basins which have more or less long straight sections. The apparatus for circulating the basin contents according to our invention may also be used in square or rectangular basins in which the blades extend across the entire cross-section only intermittently.
The invention is described more fully hereinafter with re-ference to the accompanying drawings, in which Figs. 7 and 8 are shown on the sheet of drawings having Figs. 3 and 4 thereon and wherein:
FIG. 1 is a sectional view showing a circular basin with circulating apparatus according to our invention;
FIG. 2 is a plan view of the apparatus shown in FIG. l;
FIG. 3 is a side elevational view showing the circulating apparatus in side elevation with the basin being shown in section;
FIG. 4 is a fragmental perspective view showing a detail of the circulating apparatus;
FIG. 5 is a side elevational view showing another form of our circulating apparatus;
FIG. 6 is a plan view of the apparatus shown in FIG. 5;
02~
FIG. 7 is a fragmental sectional view showing the partial blade as being V-shaped;
FIG. 8 is a fragmental sectional view showing the partial blade as having a curved profilei FIG. 9 is a fragmental view showing adjacent partial blades connected together by flexible members; and FIG. 10 is a fragmental view showing the blades as being subdivided in height into two or more sections.
Referring now to FIGS. 1 to 3 we show a circular basin 10 having a central column 12. Annular aerating pipes 13 are laid on the bottom of the basin 10 from which air bubbles 14 ascend.
A transportable bridge 15 is mounted for pivotal movement on the column 12 by means of a pivot bearing 16 and is mounted for movement on the basin crest 18 by means of a carriage 17.
Carried by the bridge 15 above the water level is a horizontal axis 20 on which four juxtaposed blades 19 are suspended for free swinging movement. When the bridge 15 is set in rotation in the direction of the arrow 15' by its drive motor (not shown), the bl.~des 19 exert a shear force upon the water and are them-selves pivoted backwardly and upwardly by the resistance of thewater into the starting position 19' illustrated in FIG. 3. The drive motor for the bridge 15 can therefore be started up with full speed immediately, because overloading of the motor, for the bridge and of the blade suspension means is prevented by the automatic escape of the blades. Progressively as the flow velocity of the water increases, the blades 19 swing back into their normal working position indicated at 19'' in FIG. 3. When the bridye 15 is stopped the blades 19 can escape from the water, which initially continues to flow, by swinging in the opposite direction.
The circulation of the water in the peripheral direction of the basin generated by the blades causes the air bubbles from 1 lS 7~29 the pipes 13 to ascend obliquely with a lengthened path in the water, as indicated at 21 in FIG. 3. Due to the swingable arrangement of the blades 19, an additional radial circulation of the water in the radially inner basin region occurs unexpectedly.
That ls, as shown by the arrows 22 in FIG. 2, a radially inwardly directed current is created in front of the blades 19 in the direction of travel and a radially outwardly directed current is created behind the blades. By this means the ascending air bubbles are also correspondingly diverted alternately radially inwardly and outwardly.
In circular basins the speed of the bridge 15, and also correspondingly the resistance exerted by the water, is greater on the outside than on the inside, so that upon starting up, the blades 19 located farther outwardly are pivoted into a higher position than the inner blades, as shown in FIG. 1. To prevent the escape of too much water through the triangular gaps pro-duced between adjacent blades and consequently impair the transport effect, we provide partition walls 23 at the vertical edges of the blades 19, as shown in FIG. 4. The partition walls 23 project at right angles to the surface of the blade 19 in position to bridge the triangular openings defined between adjacent blades 19.
In the embodiment illustrated in FIGS. 2 to 4 the axial center of the bridge 15 is oriented whereby it extends radially relative to the basin 10. The horizontal swing axis 20 of the blades is however arranged staggered with reference to the axial center of the bridge 15 and is also oriented parallel to the radially extending axis of the bridge 15. The swing axis 20 may also be positioned obliquely relative to the axial center of the bridge 15. By this means additional radial components of the circulating current can be generated deliberately in order to prevent sludge deposits in the center of the basin 10 or to ~ ~ 67029 improve the aeration effect by increased transverse exchange.
Similar effects can be achieved by profiling the blades 19 to provide V-shaped blades or a ploughshare-like curvature for the blades 19. The swing axis 20 may also be prolonged inwardly beyond the center of the basin and carry one or more additional blades 19 on the other side of the column 12.
The adjacent partial blades or blade sections 19 may be connected together by chains 30, cables or the like in order to limit the extent of their pivoting relative to each other.
Rigid connecting devices, such as bolts, may also be provided for the only intermittent connection of adjacent blades.
A further modification of the invention is to provide blades which are subdivided in height into two or more sections articulately connected to each other. Instead of this, or additionally, the blades or their sections may consist of flexible material.
In the circulating apparatus shown in FIGS. 5 and 6 the outer blades 24 are attached to vertically inclined swing axes 25 so that their center of gravity moves upwardly when they swing out. The innermost blade 26 is attached rigidly to a vertical support bar 27 and consists of flexible material which gives the blade 26 an adequately powerful return force for the entrainment of the basin contents. The swing axes 25 and the support bar 27 are attached to the bridge 15, so that they extend in a radial vertical plane. In order to improve the stability of the swing axes 25, they may be additionally braced by means of brackets 28.
Claims (13)
PROPERTY OR PRIVILEGE IS CLAIMED ARE DEFINED AS FOLLOWS:
1. In circulating apparatus for a water treatment basin having a rotatable transportable structure above the basin and means for introducing air bubbles into the contents of the basin adjacent the bottom of the basin, the improvement comprising, (a) at least one blade immersed into the water in the basin in position to cause circulation of the water, (b) suspension means carried by said transportable structure and supporting said blade for yieldable swinging movement about an axis extending generally transversely to the direction of travel of said suspension means in position for said blade to extend radially of the basin and pivot relative to a vertical plane passing through said axis as said blade produces a circulation of said water in the basin in the direction of travel of said transportable structure, with the center of gravity of said blade generating a return moment as it moves out of said vertical plane.
2. Circulating apparatus as defined in claim 1 in which said blade is attached swingably to a horizontal axis.
3. Circulating apparatus as defined in claim 1 in which said blade is attached pivotally to an inclined axis.
4. In circulating apparatus for water treatment basins having at least one blade immersing into the contents of the basin and supported by a transportable structure above the basin, the improvement in that said blade is suspended for yieldable swinging movement and is subdivided along its width into a plurality of partial blades which are swingable independently relative to each other.
5. Circulating apparatus as defined in claim 4 in which adjacent partial blades are connectable to each other.
6. Circulating apparatus as defined in claim 4 in which angled partition walls are provided at the edge of the partial blades in position to close any gap which appears in different pivotal positions of adjacent partial blades.
7. Circulating apparatus as defined in claim 1 in which said blade is subdivided along its height into sections which are connected to each other and are movable relative to each other.
8. Circulating apparatus as defined in claim 1 in which said blade consists of flexible material.
9. Circulating apparatus as defined in claim 2 in which said horizontal axis is angled obliquely to the direction of travel of said transportable structure.
10. Circulating apparatus as defined in claim 4 in which said inclined axis extends approximately in a radial vertical plane.
11. Circulating apparatus as defined in claim 1 in which said blade is of a generally V-shape as viewed in cross section.
12. Circulating apparatus as defined in claim 1 in which said blade is of a curved shape as viewed in cross section.
13. Circulating apparatus as defined in claim 1 in which the blade located farthest outward in a radial direction has a higher weight relative to its effective surface than those located radially farther inward.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DEP3010222.8 | 1980-03-17 | ||
| DE19803010222 DE3010222A1 (en) | 1980-03-17 | 1980-03-17 | ENVIRONMENTAL DEVICE FOR TREATMENT POOL |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1167029A true CA1167029A (en) | 1984-05-08 |
Family
ID=6097464
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000373052A Expired CA1167029A (en) | 1980-03-17 | 1981-03-16 | Rotating-arm depending articulated paddle agitators operating in a water treatment basin |
Country Status (7)
| Country | Link |
|---|---|
| EP (1) | EP0036182B1 (en) |
| JP (1) | JPS5816958B2 (en) |
| AT (1) | ATE2129T1 (en) |
| AU (1) | AU6838881A (en) |
| CA (1) | CA1167029A (en) |
| DE (2) | DE3010222A1 (en) |
| NO (1) | NO810898L (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106904736A (en) * | 2017-03-27 | 2017-06-30 | 东南大学 | A kind of hard and soft combined aeration tank surface aeration equipment |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4236567A1 (en) * | 1992-10-29 | 1994-05-05 | Passavant Werke | Biological waste water purificn. tank - has service bridge positioned above rotating barrier panel bridge |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE1484848A1 (en) * | 1964-08-08 | 1969-05-14 | Ruetgerswerke Ag | Method and device for generating an endless channel in circulation systems by means of a turbulence spiral while avoiding mechanical movers |
| DE1584890B2 (en) * | 1966-03-09 | 1971-12-09 | Danjes, Martin, Dipl.-Ing., 4930 Detmold | PURIFICATION PLANT FOR BIOLOGICAL PURIFICATION OF WASTE WATER |
| DE2349218C2 (en) * | 1973-10-01 | 1975-09-25 | Deutsche Geraetebau Gmbh, 4796 Salzkotten | Sewage treatment plant for the biological purification of wastewater |
| DE2703379C2 (en) * | 1977-01-27 | 1978-10-12 | August Dr.-Ing. 3000 Hannover Schreiber | Activated sludge plant for wastewater treatment |
| DE2717756C3 (en) * | 1977-04-21 | 1979-10-18 | Passavant-Werke Michelbacher Huette, 6209 Aarbergen | Method and device for clearing sedimentation basins |
-
1980
- 1980-03-17 DE DE19803010222 patent/DE3010222A1/en not_active Withdrawn
-
1981
- 1981-03-12 AT AT81101831T patent/ATE2129T1/en not_active IP Right Cessation
- 1981-03-12 EP EP19810101831 patent/EP0036182B1/en not_active Expired
- 1981-03-12 DE DE8181101831T patent/DE3160019D1/en not_active Expired
- 1981-03-16 AU AU68388/81A patent/AU6838881A/en not_active Abandoned
- 1981-03-16 CA CA000373052A patent/CA1167029A/en not_active Expired
- 1981-03-16 NO NO810898A patent/NO810898L/en unknown
- 1981-03-17 JP JP56037336A patent/JPS5816958B2/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106904736A (en) * | 2017-03-27 | 2017-06-30 | 东南大学 | A kind of hard and soft combined aeration tank surface aeration equipment |
| CN106904736B (en) * | 2017-03-27 | 2020-12-11 | 东南大学 | Rigid-flexible combined aeration tank surface aeration device |
Also Published As
| Publication number | Publication date |
|---|---|
| EP0036182A1 (en) | 1981-09-23 |
| ATE2129T1 (en) | 1983-01-15 |
| JPS5816958B2 (en) | 1983-04-04 |
| DE3160019D1 (en) | 1983-02-03 |
| JPS56150490A (en) | 1981-11-20 |
| AU6838881A (en) | 1981-09-24 |
| NO810898L (en) | 1981-09-18 |
| DE3010222A1 (en) | 1981-09-24 |
| EP0036182B1 (en) | 1982-12-29 |
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Legal Events
| Date | Code | Title | Description |
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| MKEX | Expiry |