GB1596945A - Apparatus for aerating liquids - Google Patents
Apparatus for aerating liquids Download PDFInfo
- Publication number
- GB1596945A GB1596945A GB23487/78A GB2348778A GB1596945A GB 1596945 A GB1596945 A GB 1596945A GB 23487/78 A GB23487/78 A GB 23487/78A GB 2348778 A GB2348778 A GB 2348778A GB 1596945 A GB1596945 A GB 1596945A
- Authority
- GB
- United Kingdom
- Prior art keywords
- covering hood
- liquid
- aerator
- peripheral zone
- hood
- 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
- 239000007788 liquid Substances 0.000 title claims description 56
- 238000005276 aerator Methods 0.000 claims description 52
- 230000002093 peripheral effect Effects 0.000 claims description 26
- 238000007654 immersion Methods 0.000 claims description 18
- 238000005273 aeration Methods 0.000 claims description 11
- 239000000463 material Substances 0.000 claims description 3
- SGPGESCZOCHFCL-UHFFFAOYSA-N Tilisolol hydrochloride Chemical compound [Cl-].C1=CC=C2C(=O)N(C)C=C(OCC(O)C[NH2+]C(C)(C)C)C2=C1 SGPGESCZOCHFCL-UHFFFAOYSA-N 0.000 claims description 2
- 230000001154 acute effect Effects 0.000 claims description 2
- 239000006260 foam Substances 0.000 claims description 2
- 239000000443 aerosol Substances 0.000 description 5
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000005755 formation reaction Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000001473 noxious effect Effects 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000001717 pathogenic effect Effects 0.000 description 1
- 230000001681 protective effect Effects 0.000 description 1
- 239000010865 sewage Substances 0.000 description 1
- 239000007921 spray Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002351 wastewater Substances 0.000 description 1
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
- C02F3/145—Protection against aerosols
-
- 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)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
- Activated Sludge Processes (AREA)
Description
(54) APPARATUS FOR AERATING LIQUIDS
(71) We, U PASSAVANT AG
MICHELBACHER HíTE, Trading as
PASSAVANT-WERKE MICHELBACHER HUTTE, a German Body Corporate, of 6209
Aarbergen 7, German Federal Republic, do hereby dedar the invention, for which we pray that a patent may be granted to us, and the method by which it is to be performed, to be particularly described in and by the following statement: The invention relates to an apparatus for aerating liquids, particularly but not exclusively waste water or sewage, having at least one
surface aerator and a covering hood associated with the aerator1 at least one peripheral zone
of the covering hood extending towards the
surface of the liquid.
It is known to provide surface aerators which have a horizontal axis i.e. cylinder aerators, or
surface aerators having a vertical axis, i.e.
centrifugal aeration, with covering hoods principally so as to retain fine droplets of liquid called
aerosol produced directly or indirectly by the
action of the aerator and to prevent them from polluting the environment with the
noxious substances or pathogenic agents which
they may contain, and also to deaden noise.
According to the type of aerator and the nature of the desired protective action, the covering hood will surround the surface aerator on all sides, or at least overlap the zone in which jets
of liquid flung upwards by the aerator and their dropping back on to the surface of the liquid
causes aerosol formation. The covering hood will also have air-inlet orifices above the aerator
and will leave sufficient space free for the liquid
to be flung upwards, and only at a given dis
tance from the surface aerator will have a
peripheral zone extending downwards towards
the surface of the liquid all around the aerator
or at least on the outflow side thereof. This
peripheral zone generally extends beneath the
surface of the liquid so as to seal the covered
space hermetically at this point. On the other
hand, it may be advantageous to retain a small
distance between the covering hood and the
surface of the liquid, thus obviating the forma
tion of an overpressure in the enclosed space, but through which the aerosol essentially cannot escape.
In previously known apparatus of the type described above the covering hood is secured either to the surface aerator itself or to its supporting structure e.g. a bridge. If the filling level in the aeration tank fluctuates or if the immersion depth of a rigidly installed surface aerator varies, the distance of the covering hood from the surface of the liquid or the immersion depth of its peripheral zone, respectively, also varies. It has now been found that for the covering hood to provide optimum aerosol-protection and sound-proofing effect whilst minimising the impairment or obtaining the maximum improvement in the aerating effect of the surface aerator, there is an optimum distance for the edge or periphery of the covering hood from the surface of the liquid, the term "distance" being used hereinafter to include not only a distance above the surface of the liquid but also an immersion depth of the edge of the covering hood below the surface of the liquid.
According to the invention there is provided apparatus for aerating liquids comprising at least one surface aerator, a covering hood associated with said one aerator and having at least one peripheral zone extending towards the surface of the liquid, and the covering hood being vertically adjustable with respect to the aerator for varying the distance of the covering hood above the surface of the liquid or the depth of immersion of the peripheral zone of the covering hood, and means for maintaining constant the distance between at least a part of said peripheral zone of the covering hood and the surface of the liquid.
In this way there is achieved permanent uniformity in the efficiency of the covering hood, independently of varying liquid level or wave motion in the aeration tank, and an unimpaired possiblity of varying the immersion depth of the surface aerator and therefore its aeration capacity in conformity with the respective oxygen demand. Accordingly, unlike the known apparatus, it cannot happen in the case of varying liquid level or varying immer sion depth of the surface aerator that the edge or periphery of the covering hood either emerges too far from the liquid, so that aerosol can escape, or is immersed too deep beneath the liquid and because of its damming action that it impairs the circulation in the aeration tank and the aeration capacity of the surface aerator.
The entire covering hood may be vertically moveable, or alternatively only its peripheral zone extending towards the surface of the liquid, said peripheral zone taking the form, for example, of an articulated or flexible flap. The device for keeping constant the distance of at least a part of the peripheral zone of the covering hood from the surface of the liquid or the immersion depth preferably comprises one or more floats.
By way of example, specific embodiments in accordance with the invention will now be described with reference to the accompanying drawings in which: Figures 1 and 2 show a vertical section and the plan view of a surface aerator of the vertical-axis type with a covering hood;
Figures 3 and 4 show a vertical section and a front elevation of a surface aerator of the horizontal-axis type with a covering hood; and
Figure 5 shows another embodiment of a covering hood for a horizontal-axis type surface aerator;
Referring to Figures 1 and 2, an aeration tank 1 is spanned by a bridge 2 in which a vertical-axis type surface aerator 4, i.e. centrifugal aeration, is mounted in a bearing 3, which aerator extends beneath the surface 7 of the liquid and whose shaft 5 is driven by a motor 6. The surface aerator 4 can be vertically adjusted in the bearing 3 so as to set its immersion depth to the desired aeration capacity.
Above the surface aerator 4 there is arranged a frustum-shaped covering hood 10 which surrounds the shaft 5 of the surface aerator at an adequate distance 11 therefrom, so as to allow the intake of air drawn in by the surface aerator, and whose edge or peripheral zone 12 is beneath the surface 7 of the liquid. The covering hood 10 is slidably guided by means of guide apertures 14 on two vertical guide rods 13, which project downwards from the bridge 2, and is supported at its four corners by floats 15. The connection 16 between the covering hood 10 and each float 15 is such that the covering hood 10 is supported by the floats precisely at the desired immersion depth of its edge 12. In order to vary this immersion depth each connection 16 may be adjustable in a manner not shown. Advantageously, the covering hood 10 can be guided by devices other than the guide rods 13 for example by means of links in the form of a parallelogram.
In the embodiment shown in Figures 3 and 4, a horizontal-axis type surface aerator 23 having an aerating cylinder or drum is mounted
on a bridge 22 spanning a tank 21, which
aerator drum is rotated in the direction of the
arrow 24 and creates a powerful outflow of
aerated water to the right as viewed in Figure
3. In this outflow area a covering hood 25 is
pivotally mounted on the bridge 22 by an
articulated connection 26, the edge of the hood
being immersed beneath the water surface 20
at the desired distance from the surface aerator
23. A constant immersion depth is ensured by
a float 28 which is preferably rotatably mounted
in a recess in the peripheral zone 27 of the
covering hood 25 and which supports the hood
25. According to the length of the surface
aerator 23, it is also possible in accordance
with Figure 4 for two or more articulated
covering hoods 25 with floats 28 to be arranged
side by side.
In the embodiment according to Figures 3
and 4 the left-hand side of the surface aerator
23 as viewed in Figure 3, i.e. the inflow side,
is not covered by a hood and air may also enter
through a grating 29 in the bridge 22, since
there is less danger at these points of a strong
spray action and aerosol formation. If desired,
however, the surface aerator may be surrounded
substantially on all sides by the covering
hood. An embodiment of this type is shown
in Figure 5. The covering hood 30 carried by a .bridge (not shown) covers the entire rotor and only air-inlet apertures 31 are left open. On both
sides of the aerator 23, the edge of the hood ex
tends towards the surface 20 of the liquid. Mov
able flaps 33, 34 are mounted by articulated
connections 32, which flaps extend beneath the
surface 20 of the liquid. The constant immer
sion depth of the flap 33 on the outflow side
is ensured by a float 35. Similarly, the flap
34 on the inflow side may have such a float or
may even, for example, be made of buoyant
material or take the form of a float.
Numerous modifications and variants of the
described embodiments are possible within the
scope of the invention. For example, the peri
pheral or edge zones of the covering hood,
instead of being formed as rigid articulated
flaps, may be designed as flexible flaps in the
form of rubber aprons or the like whose edges
are supported by floats. Instead of a constant
immersion depth, it is also possible to main
tain a constant distance of the edge of the
covering hood above the surface of the liquid.
The device for maintaining the constant dis
tance or the constant immersion depth may,
instead of floats, comprise a more expensive
device, e.g. a hoisting unit, whose drive is
controlled by a sensor for the surface of the
liquid and which raises or lowers the hood
according to the level of the liquid.
It is unnecessary for the whole of the edge
or the peripheral zone of the hood lying in the
region of the surface of the liquid to be main
tained constantly in its position relative to the
surface of the liquid. Frequently it is sufficient
to provide this feature only on the outflow side of a surface aerator, e.g. on the right-hand side as viewed in Figure 5. The left-hand flap 34 in Figure 5 may be so arranged that it extends only slightly beneath the surface of the liquid or may be made so light that the flow pressure brings it into an oblique position and forms an acute angle with the surface of the liquid.
This enables foam or scum to be carried along under the flap 34 by the flow of liquid.
An advantage of the embodiments described above is that the covering hood may retain its optimum distance relative to the surface of the liquid irrespective of the level of liquid in the aeration tank and/or variations in the immersion depth of the surface aerator.
WHAT WE CLAIM IS:- 1. Apparatus for aerating liquids comprising at least one surface aerator, a covering hood associated with said one aerator and having at least one peripheral zone extending towards the surface of the liquid, the covering hood being vertically adjustable with respect to the aerator for varying the distance of the covering hood above the surface of the liquid or the depth of immersion of the peripheral zone of the covering hood, and means for maintaining constant the distance between at least a part of said peripheral zone of the covering hood and the surface of the liquid.
2. Apparatus as claimed in claim 1, wherein the or each said peripheral zone of the covering hood which extends towards the surface of the liquid is a flap which is movably mounted on the covering hood.
3. Apparatus as claimed in claim 2, wherein the or each flap is pivotably mounted on the covering hood.
4. Apparatus as claimed in claim 2, wherein the or each flap is formed of flexible material.
5. Apparatus as claimed in any one of the preceding claims, wherein the covering hood or its vertically movable peripheral zone or zones are supported by at least one float.
6. Apparatus as claimed in daim 5, wherein the or each float is fastened to the covering hood by a vertically adjustable connection.
7. Apparatus as claimed in any one of claims 1, 5 and 6, wherein the surface aerator and the covering hood are supported by floats.
8. Apparatus as claimed in claim 7, wherein the surface aerator and the covering hood or its peripheral zone or zones are vertically adjustable relative to one another and in relation to the floats.
9. Apparatus as claimed in claim 1, wherein the entire covering hood is slidably guided on vertical guides attached to the surface aerator or its mounting.
10. Apparatus for aerating liquids substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
**WARNING** end of DESC field may overlap start of CLMS **.
Claims (10)
1. Apparatus for aerating liquids comprising at least one surface aerator, a covering hood associated with said one aerator and having at least one peripheral zone extending towards the surface of the liquid, the covering hood being vertically adjustable with respect to the aerator for varying the distance of the covering hood above the surface of the liquid or the depth of immersion of the peripheral zone of the covering hood, and means for maintaining constant the distance between at least a part of said peripheral zone of the covering hood and the surface of the liquid.
2. Apparatus as claimed in claim 1, wherein the or each said peripheral zone of the covering hood which extends towards the surface of the liquid is a flap which is movably mounted on the covering hood.
3. Apparatus as claimed in claim 2, wherein the or each flap is pivotably mounted on the covering hood.
4. Apparatus as claimed in claim 2, wherein the or each flap is formed of flexible material.
5. Apparatus as claimed in any one of the preceding claims, wherein the covering hood or its vertically movable peripheral zone or zones are supported by at least one float.
6. Apparatus as claimed in daim 5, wherein the or each float is fastened to the covering hood by a vertically adjustable connection.
7. Apparatus as claimed in any one of claims 1, 5 and 6, wherein the surface aerator and the covering hood are supported by floats.
8. Apparatus as claimed in claim 7, wherein the surface aerator and the covering hood or its peripheral zone or zones are vertically adjustable relative to one another and in relation to the floats.
9. Apparatus as claimed in claim 1, wherein the entire covering hood is slidably guided on vertical guides attached to the surface aerator or its mounting.
10. Apparatus for aerating liquids substantially as hereinbefore described with reference to and as shown in the accompanying drawings.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19772734629 DE2734629A1 (en) | 1977-08-01 | 1977-08-01 | DEVICE FOR VENTILATING LIQUIDS, IN PARTICULAR WASTE WATER |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| GB1596945A true GB1596945A (en) | 1981-09-03 |
Family
ID=6015366
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB23487/78A Expired GB1596945A (en) | 1977-08-01 | 1978-05-26 | Apparatus for aerating liquids |
Country Status (8)
| Country | Link |
|---|---|
| JP (1) | JPS5460756A (en) |
| AT (1) | AT359930B (en) |
| DE (1) | DE2734629A1 (en) |
| DK (1) | DK339478A (en) |
| FR (1) | FR2399272A1 (en) |
| GB (1) | GB1596945A (en) |
| IT (1) | IT1103063B (en) |
| NL (1) | NL7807685A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000002443A1 (en) * | 1998-07-08 | 2000-01-20 | Silvano Becchi | Apparatus for oxygenating water |
Families Citing this family (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| AT385754B (en) * | 1981-06-11 | 1988-05-10 | Tatabanyai Szenbanyak | DRIVE WITH A VERTICAL SHAFT FOR SURFACE VENTILATION OF LIQUIDS, IN PARTICULAR WATER |
| US4741869A (en) * | 1986-09-12 | 1988-05-03 | Dhv Raadgevend Ingenieursbureau B.V. | Apparatus for contacting a gas with a liquid, in particular for aerating waste water |
| DE3931617A1 (en) * | 1989-09-22 | 1991-04-04 | Ieg Ind Engineering Gmbh | ARRANGEMENT FOR CLEANING AND VENTILATION OF OPEN WATERS |
| FR2660647B1 (en) * | 1990-04-06 | 1993-02-05 | Dregremont | HOOD FOR A ROTARY SURFACE AERATOR USED FOR THE AERATION OF BASINS FOR THE TREATMENT OF WATER. |
| US5262093A (en) * | 1990-04-06 | 1993-11-16 | Degremont | Cowling for a rotary surface aerator used for the aeration of tanks intended for water treatment |
| DE4120890A1 (en) * | 1991-06-25 | 1993-01-07 | Sanwa Seidlitz Gmbh | DEVICE FOR ENRICHING WATER WITH OXYGEN, WHICH IS FURNISHED AND TRANSPORTED |
| BR9205151A (en) * | 1992-08-17 | 1994-03-01 | Praxair Technology Inc | INCREASED GAS DISSOLUTION |
| US6145815A (en) * | 1992-08-17 | 2000-11-14 | Praxair Technology, Inc. | System for enhanced gas dissolution having a hood positioned over the impeller with segregating rings |
| FR2736044A1 (en) * | 1995-06-29 | 1997-01-03 | Version Composite | Stable lightweight cover for water purification plant |
Family Cites Families (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CH507164A (en) | 1970-06-16 | 1971-05-15 | Kaelin J R | Aerator for effluent or other liquids |
| US3846517A (en) * | 1972-07-26 | 1974-11-05 | Clow Corp | Stabilization system for a floating water aerator |
| JPS5225023Y2 (en) * | 1974-04-27 | 1977-06-07 | ||
| JPS51119762U (en) * | 1975-03-21 | 1976-09-28 | ||
| DE2539086A1 (en) | 1975-09-03 | 1977-03-10 | Krupp Koppers Gmbh | Sewage surface aeration impeller - mounted under conical cowl with air inlets and contacting fluid surface at safe distance |
-
1977
- 1977-08-01 DE DE19772734629 patent/DE2734629A1/en not_active Ceased
-
1978
- 1978-05-26 GB GB23487/78A patent/GB1596945A/en not_active Expired
- 1978-07-04 FR FR7819877A patent/FR2399272A1/en active Granted
- 1978-07-11 AT AT499478A patent/AT359930B/en not_active IP Right Cessation
- 1978-07-18 NL NL787807685A patent/NL7807685A/en not_active Application Discontinuation
- 1978-07-28 IT IT954878A patent/IT1103063B/en active
- 1978-07-31 DK DK339478A patent/DK339478A/en not_active Application Discontinuation
- 1978-08-01 JP JP9322778A patent/JPS5460756A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2000002443A1 (en) * | 1998-07-08 | 2000-01-20 | Silvano Becchi | Apparatus for oxygenating water |
Also Published As
| Publication number | Publication date |
|---|---|
| FR2399272A1 (en) | 1979-03-02 |
| IT1103063B (en) | 1985-10-14 |
| ATA499478A (en) | 1980-04-15 |
| FR2399272B3 (en) | 1981-02-06 |
| NL7807685A (en) | 1979-02-05 |
| AT359930B (en) | 1980-12-10 |
| IT7809548A0 (en) | 1978-07-28 |
| DE2734629A1 (en) | 1979-02-08 |
| JPS5627318B2 (en) | 1981-06-24 |
| DK339478A (en) | 1979-02-02 |
| JPS5460756A (en) | 1979-05-16 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PS | Patent sealed [section 19, patents act 1949] | ||
| PCNP | Patent ceased through non-payment of renewal fee |