WO1996009989A1 - Aerateur a rendement ameliore - Google Patents

Aerateur a rendement ameliore Download PDF

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Publication number
WO1996009989A1
WO1996009989A1 PCT/BE1994/000063 BE9400063W WO9609989A1 WO 1996009989 A1 WO1996009989 A1 WO 1996009989A1 BE 9400063 W BE9400063 W BE 9400063W WO 9609989 A1 WO9609989 A1 WO 9609989A1
Authority
WO
WIPO (PCT)
Prior art keywords
screw
power source
air
liquid
motor
Prior art date
Application number
PCT/BE1994/000063
Other languages
English (en)
Inventor
Johny Hector Haegeman
Original Assignee
Haegeman J H
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 Haegeman J H filed Critical Haegeman J H
Priority to PCT/BE1994/000063 priority Critical patent/WO1996009989A1/fr
Priority to AU76487/94A priority patent/AU7648794A/en
Publication of WO1996009989A1 publication Critical patent/WO1996009989A1/fr

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
    • C02F3/165—Activated sludge processes using surface aeration the aerator having a vertical axis using vertical aeration channels
    • 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
    • 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
    • B01F23/237—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media
    • B01F23/2376—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids characterised by the physical or chemical properties of gases or vapours introduced in the liquid media characterised by the gas being introduced
    • B01F23/23761—Aerating, i.e. introducing oxygen containing gas in liquids
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/114—Helically shaped stirrers, i.e. stirrers comprising a helically shaped band or helically shaped band sections
    • B01F27/1143—Helically shaped stirrers, i.e. stirrers comprising a helically shaped band or helically shaped band sections screw-shaped, e.g. worms
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
    • B01F35/30—Driving arrangements; Transmissions; Couplings; Brakes
    • B01F35/32—Driving arrangements
    • B01F35/321—Disposition of the drive
    • B01F35/3214—Disposition of the drive at the upper side of the axis, e.g. driving the stirrer from the top of a receptacle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F2101/00—Mixing characterised by the nature of the mixed materials or by the application field
    • B01F2101/305—Treatment of water, waste water or sewage
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F27/00—Mixers with rotary stirring devices in fixed receptacles; Kneaders
    • B01F27/05—Stirrers
    • B01F27/11—Stirrers characterised by the configuration of the stirrers
    • B01F27/15—Stirrers with tubes for guiding the material
    • 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
    • B01F27/80—Mixers with rotary stirring devices in fixed receptacles; Kneaders with stirrers rotating about a substantially vertical axis
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F33/00—Other mixers; Mixing plants; Combinations of mixers
    • B01F33/50—Movable or transportable mixing devices or plants
    • B01F33/503—Floating mixing devices
    • 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

Definitions

  • This invention relates to devices which are used for the aeration of liquids, particularly water.
  • These devices consist of a power source, generally a motor, which drives a shaft to which a paddle element is attached and wherein the device is often mounted fixed above the water to be treated or is mounted on a float.
  • the paddle element consists of a screw pump, wherein in the most efficient devices the screw pump has the form of a centrifugal screw pump, consisting of a screw which starts substantially from below on the central shaft of the paddle element and runs upwards in the form of a spiral.
  • This central shaft is provided at its top end with an outwardly bent turned-back body which is approximately trumpet- shaped. Water is pumped up by the screw pump and is dispersed substantially horizontally over the water surface.
  • the motor is usually attached to a fixed plate or disc-shaped element which is situated above the turned-back body and which also contributes to the further deflection of the pumped-up water stream, the motor shaft to which the paddle element is attached passing through an opening in this plate or disc.
  • a reduced pressure is created by the flow of the water in the space between the motor and the turned-back body.
  • This reduced pressure also makes its effect felt in the motor - via the removal of lubricant from the bearings - and can cause damage to the motor by depleting the bearing lubricant and drawing in water or moist air via the condensate outlet.
  • this reduced pressure at the same time causes particles of dirt to be discharged into the space below the motor.
  • the object of the present invention is to overcome these disadvantages and at the same time to introduce air and oxygen into the water and consequently also to improve the efficiency of these devices.
  • the reduced pressure created in the space above the turned-back body is used for the aspiration of air, so that an air current is produced and consequently an enhanced introduction of air into the outflow zone of the water is obtained.
  • this air current can be obtained by bringing the space between the motor and the mounting plate into contact with the atmosphere.
  • this contact with the atmosphere can be effected by distance elements provided between the motor and the mounting plate of the motor. These distance elements create openings by means of which the air current is mixed at the level of the turned-back body with the water stream. This enhanced introduction of air into the water stream increases the efficiency of the device by a considerable extent.
  • this air current can be improved even further by providing blades above the turned-back body.
  • the air current can be increased even further by making use of the cooling fan effect; for this purpose a casing can be provided around the motor and the air can be led in via this casing.
  • the efficiency of these devices can be further improved by designing the screw pump according to the application concerned, the size of the basin to be treated, the type of contaminated water, the ambient temperature, etc.
  • the screw pump over the entire length of the shaft or merely over sections thereof.
  • the speed, diameter and the number of turns of the screw can be adapted to suit, the screw can be single-threaded or multiple-threaded.
  • the screw can also be 3 panly single-threaded and pa ⁇ ly multiple-threaded.
  • the screw can thus have extra blades near the lowest part to enhance the pumping effect, but may also have extra blades near the water surface to enhance the centrifugal force for dispersing the water. All possible variants of screw pumps can be used within the scope of the present invention.
  • a further improvement in efficiency can be obtained by optimising the induced movement of the water by the provision of guidance means on the device in the vicinity of the water aspiration zone which convert the direction of rotation of the water into a combined horizontal and vertical rotational movement.
  • These guidance means consist of screw-shaped or flat plates which are provided at a suitable angle around the device.
  • Figure 1 is a schematic illustration of an aerator constructed according to the prior art, showing a detail of the outlined portion;
  • Figure 2 is a partial schematic representation of an aerator according to the invention, showing a detail of the outlined portion:
  • Figure 3 is a schematic representation of an embodiment of an aerator with counter-blades
  • Figure 4 is a schematic representation of an aerator with air aspiration via the motor
  • Figure 5 is a schematic representation of an aerator with distance elements and an improved screw pump.
  • FIG. 6 is a schematic representation of an aerator with distance elements and improved water circulation.
  • the same components are denoted by the same reference numerals for the sake of simplicity.
  • FIG. 1 this illustrates a prior art surface aerator consisting of a motor 1. a float 3, a pump housing 4, an aspiration cone 5 and a stabilisation body 12.
  • the motor 1 is attached to the float 3 by means of a flanged transition piece 8.
  • the top end of the central shaft 2 of the propeller element 6, 7 is widened and forms an outwardly bent turned-back body 6.
  • a double-thread screw 7 is provided around the central shaft 2 of the propeller element 6, 7.
  • the screw 7 draws up water which is dispersed approximately horizontally via the turned-back body 6 over the water surface 9.
  • the outflow of the water generates a reduced pressure in the zone 11 near the turned-back body 6.
  • This reduced pressure is communicated to the space 13 below the motor 1 where the lubricant outlet 14 leads out, and can propagate into the inside 16 of the motor 1 via the lubricant outlet 14 of the motor bearing and can come into contact with the atmosphere via the condensate outlet 15. This causes moisture and particles of dirt to be drawn into the motor, the consequence of which is damage to the windings and the bearings.
  • Figure 2 shows an aerator similar to that illustrated in Figure 1 , but which is provided with means which make use of the reduced pressure for introducing air.
  • the underside 23 of the motor 1 is attached to the top plate 25 of the flanged transition piece 8 via distance elements 24.
  • air is drawn in via the space 26 between elements 23 and 25.
  • the reduced pressure created by the outflow of water in zone 11 is sufficient to draw in an air current via the space 26.
  • the disadvantages of damage or the deposition of dirt in the motor are avoided.
  • the aspirated air increases the oxygen content of the water dispersed on the water surface, due to which the efficiency of the aerator is significantly improved.
  • FIG. 3 illustrates another embodiment.
  • This Figure shows that the top edge 39 of the turned-back body 6 and the top plate 25 of the flanged transition piece 8 are separated from each other. Because the flanged transition piece 8 is fixed and the turned-back 5 body 6 rotates, there is a space between the two. If there are then one or more openings 36 in the top plate 25 of the flanged transition piece 8, air is drawn in according to the invention via these openings into zone 11 as a consequence of the reduced pressure in zone 11.
  • This aspiration effect is enhanced by counter-blades 37 provided between the top edge 39 of the turned-back body 6 and the top plate 25 of the flanged transition piece 8. These counter-blades 37, which rotate with the shaft 2. considerably improve the aspiration effect in zone 11.
  • FIG 4 shows an aerator similar to that illustrated in Figure 2. but in this embodiment air is drawn in around the motor.
  • the motor 1 is surrounded by a casing 41, and the air which is drawn into zone 11 according to the invention emerges from the space formed between the motor 1 and the casing 41.
  • This air can thus also serve as a cooling medium if the suction force in zone 11 is great enough so that the aspirated air is sufficient to cool the motor 1 satisfactorily. Due to this effect, the classical cooling means (fan 42) can be omitted and additional motor capacity becomes available. Moreover, due to its cooling effect this air contains energy which is usefully employed in the dispersion of water over the water surface.
  • cooling of the motor is effected in the classical manner, namely by means of a fan 42. Because the motor 1 is surrounded by a casing 41 the heated cooling air is guided into zone 11 , whereby the pressure effect due to the fan increases the through-flow of air into zone 11.
  • Figure 5 illustrates a variant of Figure 3, in which the aerator comprises a centrifugal screw impeller.
  • the screw consists of a continuous screw blade 51, an auxiliary screw blade 52 at the bottom end of the screw blade construction and an auxiliary screw blade 53 at the top end near the turned-back body 6 of the screw blade construction. Due to the auxiliary screw blade 52 the aspiration effect of the pump is enhanced and due to the auxiliary screw blade 53 the centrifugal force of the impeller is increased, but frictional losses and turbulence are kept low. 6
  • screw blade construction can assume all possible forms, but always comprises at least one continuous screw, wherein one or more screw blades are present either at the bottom end, at the top end, or at both ends.
  • Figure 6 illustrates a variant of Figure 2, in which the aerator comprises screw-shaped guidance means 61 around the pump housing and aspiration cone, whereby a rotational movement having both a horizontal and a vertical component is imparted to the water.
  • the guidance means can be placed solely round the pump housing and/or aspiration cone or can optionally be placed round the centrifugal screw impeller if no pump housing or aspiration cone is present.
  • the guidance means do not have to be screw-shaped and can also consist of flat plates.
  • blades 37 shown in Figure 3 can thus be combined with the casing 41 illustrated in Figure 4, or the blades 37 can be combined with the improved screw pump shown in Figure 5 or with the improved water circulation according to Figure 6, etc., without falling outside the scope of this invention.
  • the air flow can be improved by various technical means, blades or the provision of a casing round the motor merely being examples thereof. 7
  • This invention is also not restricted to the aerators described, but can be applied to every aerator of the type which has a propeller element which disperses water over the water surface.

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)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

Dispositif pour l'aération de liquides, constitué d'une unité motrice (1) entraînant un élément à hélice (6, 7) composé d'une roue hélice centrifuge formée d'une hélice (7) s'étendant sensiblement depuis le bas sur un arbre central (2) et vers le haut selon une courbe spiralée, un déflecteur (6) tourné vers l'extérieur étant fixé à son extrémité supérieure de sorte que le liquide est aspiré vers le haut et dispersé par-dessus la surface (9) du liquide. Le dispositif comporte, au-dessus du déflecteur, un ensemble adapté pour que la dépression créée par le débit de liquide soit utilisée pour aspirer l'air et pour éviter que le moteur ne subisse des dégâts dus à la dépression.
PCT/BE1994/000063 1994-09-28 1994-09-28 Aerateur a rendement ameliore WO1996009989A1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
PCT/BE1994/000063 WO1996009989A1 (fr) 1994-09-28 1994-09-28 Aerateur a rendement ameliore
AU76487/94A AU7648794A (en) 1994-09-28 1994-09-28 Aerator with improved efficiency

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/BE1994/000063 WO1996009989A1 (fr) 1994-09-28 1994-09-28 Aerateur a rendement ameliore

Publications (1)

Publication Number Publication Date
WO1996009989A1 true WO1996009989A1 (fr) 1996-04-04

Family

ID=3887895

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/BE1994/000063 WO1996009989A1 (fr) 1994-09-28 1994-09-28 Aerateur a rendement ameliore

Country Status (2)

Country Link
AU (1) AU7648794A (fr)
WO (1) WO1996009989A1 (fr)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0904148A1 (fr) * 1996-05-03 1999-03-31 Aeration Industries International, Inc. Turbo-aerateur
EP0907404A1 (fr) 1996-05-03 1999-04-14 Aeration Industries International, Inc. Aerateur/melangeur assiste par air
EP2266683A3 (fr) * 2005-10-19 2011-03-30 Waterix Oy Appareil pour le refroidissement et/ou la condensation et/ou l'aération et/ou le mélange de l'eau et son utilisation
CN113307389A (zh) * 2021-06-04 2021-08-27 上海汇蓬环境技术股份有限公司 一种强化曝气生态修复装置

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4145383A (en) * 1976-09-01 1979-03-20 Howard Machinery Limited Slurry aeration method and apparatus
GB2049457A (en) * 1979-05-09 1980-12-31 Giza Spa Fermentation reactors
EP0048875A1 (fr) * 1980-09-26 1982-04-07 Lussoria Antonietta Sciolla Appareil pour l'introduction d'un gaz dans un liquide, en particulier pour l'introduction d'oxygène dans de l'eau polluée
BE893687R (nl) * 1980-07-08 1982-10-18 Haegeman Johny H Inrichting voor het mengen van gas met vloeistof of omgekeerd en voor het ontgassen van een vloeistof
EP0366644A1 (fr) * 1988-10-26 1990-05-02 Johny Hector Haegeman Mélangeur et/ou aérateur pour eaux résiduaires
EP0612696A1 (fr) * 1993-02-24 1994-08-31 Johny Hector Haegeman Procédé et dispositif pour mouvement contrôlé de l'eau dans les cuves d'eau

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4145383A (en) * 1976-09-01 1979-03-20 Howard Machinery Limited Slurry aeration method and apparatus
GB2049457A (en) * 1979-05-09 1980-12-31 Giza Spa Fermentation reactors
BE893687R (nl) * 1980-07-08 1982-10-18 Haegeman Johny H Inrichting voor het mengen van gas met vloeistof of omgekeerd en voor het ontgassen van een vloeistof
EP0048875A1 (fr) * 1980-09-26 1982-04-07 Lussoria Antonietta Sciolla Appareil pour l'introduction d'un gaz dans un liquide, en particulier pour l'introduction d'oxygène dans de l'eau polluée
EP0366644A1 (fr) * 1988-10-26 1990-05-02 Johny Hector Haegeman Mélangeur et/ou aérateur pour eaux résiduaires
EP0612696A1 (fr) * 1993-02-24 1994-08-31 Johny Hector Haegeman Procédé et dispositif pour mouvement contrôlé de l'eau dans les cuves d'eau

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0904148A1 (fr) * 1996-05-03 1999-03-31 Aeration Industries International, Inc. Turbo-aerateur
EP0907404A1 (fr) 1996-05-03 1999-04-14 Aeration Industries International, Inc. Aerateur/melangeur assiste par air
EP0904148A4 (fr) * 1996-05-03 2000-09-13 Aeration Ind International Inc Turbo-aerateur
EP2266683A3 (fr) * 2005-10-19 2011-03-30 Waterix Oy Appareil pour le refroidissement et/ou la condensation et/ou l'aération et/ou le mélange de l'eau et son utilisation
CN113307389A (zh) * 2021-06-04 2021-08-27 上海汇蓬环境技术股份有限公司 一种强化曝气生态修复装置
CN113307389B (zh) * 2021-06-04 2023-04-07 上海汇蓬环境技术股份有限公司 一种强化曝气生态修复装置

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Publication number Publication date
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