CH374600A - Aeration device for wastewater purification using the activated sludge process - Google Patents
Aeration device for wastewater purification using the activated sludge processInfo
- Publication number
- CH374600A CH374600A CH7709759A CH7709759A CH374600A CH 374600 A CH374600 A CH 374600A CH 7709759 A CH7709759 A CH 7709759A CH 7709759 A CH7709759 A CH 7709759A CH 374600 A CH374600 A CH 374600A
- Authority
- CH
- Switzerland
- Prior art keywords
- container
- ventilation device
- dependent
- air passage
- passage openings
- Prior art date
Links
- 239000010802 sludge Substances 0.000 title claims description 11
- 238000000034 method Methods 0.000 title claims description 9
- 239000002351 wastewater Substances 0.000 title claims description 9
- 238000005273 aeration Methods 0.000 title claims description 6
- 238000000746 purification Methods 0.000 title claims description 6
- 238000009423 ventilation Methods 0.000 claims description 16
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 6
- 230000001419 dependent effect Effects 0.000 claims 8
- 238000005192 partition Methods 0.000 claims 1
- 238000009826 distribution Methods 0.000 description 4
- 239000010865 sewage Substances 0.000 description 4
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 238000004140 cleaning Methods 0.000 description 3
- 239000000203 mixture Substances 0.000 description 3
- 239000001301 oxygen Substances 0.000 description 3
- 229910052760 oxygen Inorganic materials 0.000 description 3
- 230000031018 biological processes and functions Effects 0.000 description 2
- 230000002706 hydrostatic effect Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 244000005700 microbiome Species 0.000 description 2
- 230000000630 rising effect Effects 0.000 description 2
- 239000010801 sewage sludge Substances 0.000 description 2
- 241000894006 Bacteria Species 0.000 description 1
- RWSOTUBLDIXVET-UHFFFAOYSA-N Dihydrogen sulfide Chemical compound S RWSOTUBLDIXVET-UHFFFAOYSA-N 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 239000000969 carrier Substances 0.000 description 1
- 238000011109 contamination Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910000037 hydrogen sulfide Inorganic materials 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000010926 purge Methods 0.000 description 1
- 238000004062 sedimentation Methods 0.000 description 1
- 238000007493 shaping process Methods 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
- 239000003643 water by type 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
- C02F3/20—Activated sludge processes using diffusers
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F35/00—Accessories for mixers; Auxiliary operations or auxiliary devices; Parts or details of general application
- B01F35/71—Feed mechanisms
- B01F35/717—Feed mechanisms characterised by the means for feeding the components to the mixer
- B01F35/71805—Feed mechanisms characterised by the means for feeding the components to the mixer using valves, gates, orifices or openings
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2311—Mounting the bubbling devices or the diffusers
- B01F23/23114—Mounting the bubbling devices or the diffusers characterised by the way in which the different elements of the bubbling installation are mounted
- B01F23/231142—Mounting the gas transporting elements, i.e. connections between conduits
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2311—Mounting the bubbling devices or the diffusers
- B01F23/23115—Mounting the bubbling devices or the diffusers characterised by the way in which the bubbling devices are mounted within the receptacle
- B01F23/231151—Mounting the bubbling devices or the diffusers characterised by the way in which the bubbling devices are mounted within the receptacle the bubbling devices being fixed or anchored in the bottom
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23123—Diffusers consisting of rigid porous or perforated material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23123—Diffusers consisting of rigid porous or perforated material
- B01F23/231231—Diffusers consisting of rigid porous or perforated material the outlets being in the form of perforations
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
- B01F23/20—Mixing gases with liquids
- B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
- B01F23/231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids by bubbling
- B01F23/23105—Arrangement or manipulation of the gas bubbling devices
- B01F23/2312—Diffusers
- B01F23/23126—Diffusers characterised by the shape of the diffuser element
- B01F23/231261—Diffusers characterised by the shape of the diffuser element having a box- or block-shape, being in the form of aeration stones
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
- 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
- B01F23/232—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles
- B01F23/2323—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles by circulating the flow in guiding constructions or conduits
- B01F23/23231—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles by circulating the flow in guiding constructions or conduits being at least partially immersed in the liquid, e.g. in a closed circuit
- B01F23/232311—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using flow-mixing means for introducing the gases, e.g. baffles by circulating the flow in guiding constructions or conduits being at least partially immersed in the liquid, e.g. in a closed circuit the conduits being vertical draft pipes with a lower intake end and an upper exit end
-
- 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
- B01F35/32005—Type of drive
- B01F35/3203—Gas driven
-
- 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
- B01F35/71—Feed mechanisms
-
- 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
- B01F35/71—Feed mechanisms
- B01F35/712—Feed mechanisms for feeding fluids
-
- 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
- B01F35/32005—Type of drive
- B01F35/32015—Flow driven
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Life Sciences & Earth Sciences (AREA)
- Biodiversity & Conservation Biology (AREA)
- Microbiology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
Description
Belüftungseinrichtung zur Abwasserreinigung nach dem Belebtschlammverfahren Die vorliegende Erfindung bezieht sich auf eine Belüftungseinrichtung zur Abwasserreinigung nach dem Belebtschlammverfahren.
Das Belebtschlammverfahren ist ein Verfahren zur Reinigung von Abwasser und beruht darauf, dass sich in dem zu reinigenden Abwasser Schlammpar tikeln befinden, die mit Bakterien und kleinen Lebe wesen aller Art durchsetzt sind, wodurch eine Reini gung des Abwassers in analoger Weise herbeigeführt wird, wie dies in der Natur zur Selbstreinigung der Flüsse und Gewässer geschieht: Zahlreiche moderne Grosskläranlagen arbeiten nach diesem Verfahren, das auch als biologisches Verfahren bezeichnet wird.
Zur Ausbildung und Er haltung der Mikroorganismen, die den Grad und die Geschwindigkeit des Reinigungsvorganges und damit den Durchsatz einer Kläranlage wesentlich be stimmen, ist es notwendig, dass dem Abwasser schlammgemisch Luft zugeführt wird (Sauerstoffein trag). Weiterhin ist es für die Wirkung einer Klär anlage nach dem biologischen Verfahren wesentlich, dass ein Absetzen der Schlammteile verhindert (Durchmischung) und ihre gleichmässige Verteilung gewährleistet wird, so lange die biologische Wirkung der Mikroorganismen erforderlich ist.
Die Luftzufuhr und die Schlammverteilung wer den im allgemeinen gemeinsam dadurch bewirkt, dass das zu reinigende Abwasser in einem Becken mit Luft durchspült wird. Diese Luftdurchspülung kann auch noch aus. anderen Gründen, beispielsweise zum Entfernen von gasförmigen Verunreinigungen, wie Schwefelwasserstoff, verwendet werden, wobei dann allerdings noch andere Gesichtspunkte mass- geblich sind.
Die Luftzufuhr für den biologischen Reinigungs- prozess erfolgt im allgemeinen dadurch, dass in ein Becken auf einer Seite Luft eingeblasen wird. Die aufsteigenden Luftblasen erzeugen eine Aufwärts bewegung des Abwasserschlammgemisches, welches dadurch in eine Umlaufbewegung gebracht wird. Die Luftaufnahme erfolgt sowohl in der Zone der auf steigenden Luftblasen als auch an der Wasserober fläche. Die Luft kann in verschiedenen Tiefen in das Becken eingeblasen werden und muss dementspre chend zur Überwindung des hydrostatischen Wasser druckes mehr oder weniger hoch verdichtet werden.
Die Wirksamkeit der Belüftung ist neben der Luftmenge und Luftführung auch durch die Form und -Grösse der Öffnungen bedingt, durch die die Luft in das Abwasser eintritt, wobei ausserdem noch zu berücksichtigen ist, dass die Anforderungen an die Pumpenleistung steigen, wenn zusätzlich zur Überwindung des hydrostatischen Druckes auch noch ein durch ungünstige Anordnung der Lufteinlass- öffnungen bedingter hydrodynan-iischer Druck und Leitungswiderstand zu überwinden sind.
Eine verbreitete Art der Luftzuführung besteht darin, dass die Luft zur Verteilung durch Filter- oder Frittenplatten gedrückt wird, während eine andere Möglichkeit im Einbau von Röhren im Becken be steht, die mit Luftaustrittsöffnungen versehen sind.
Beide Anordnungen haben neben dem relativ hohen Strömungswiderstand noch den Nachteil, dass sich die Luft bis zum Augenblick des -Ober ganges in das Wasser in einem bis auf die Austritts öffnung geschlossenen und daher meist schwer zu gänglichen Raum befindet. Es ist im Betrieb kaum vermeidlich, dass sich in diesem Schmutz und Schlamm absetzt, der sich dann meist nur unter Schwierigkeiten beseitigen lässt.
Bei der erfindungsgemässen Belüftungseinrich tung sollen diese Nachteile beseitigt werden, wobei ausserdem noch die Ausbildung einer grossen Was- ser-Luft-Grenzfläche angestrebt wird.
Die Belüftungseinrichtung gemäss der vorliegen den Erfindung besitzt mindestens einen nach unten geöffneten Behälter, dessen Innenraum an eine Luft- zuführungsleitung angeschlossen ist, und ist dadurch gekennzeichnet, dass mindestens annähernd senk rechte Strömungskanäle vorgesehen sind, die Luft durchtrittsöffnungen besitzen.
Die erfindungsgemässe Belüftungseinrichtung er möglicht auf überraschend einfache Weise eine wirt schaftliche und betriebssichere Arbeitsweise.
Durch Bildung von Luftpolstern in den nach un ten geöffneten Behältern wird eine grössere Aus- nützung des Luftsauerstoffes ermöglicht, indem da durch ohne vermehrten Luftaufwand eine zusätzliche aktive Wasser-Luft-Grenzschicht geschaffen wird, was einer vermehrten Wasserspiegelfläche gleich kommt und die Sauerstoffaufnahme verbessert.
Da der Behälter unten offen ist, ist überdies eine Störung durch Verschmutzung im normalen Betrieb ausgeschlossen.
Anhand der in den Zeichnungen dargestellten beispielsweisen Ausführungsformen wird die Erfin dung im folgenden näher erläutert. Die Fig. 1-4- zei gen eine mögliche Ausführungsform, wobei die Fig.2 und 3 Schnitte gemäss den Linien II-II bZW..HI-III darstellen. Eine Luftleitung 1 führt in den von- dem nach unten geöffneten Behälter 4 umschlossenen Raum 5. Die Mündung 2 der Luftleitung ist ein Quader mit zwei gegenüberliegenden offenen Seiten.
Der Strömungskanal 6 wird durch den nach oben und unten offenen, senkrechten Rohrstutzen 3 ge bildet, durch dessen kreisrunde Luftdurchtrittsöff- nungen 7 die Luft aus dem im Räum 5 bei Luftzu führung durch die Leitung 1 sich ausbildenden Luft polster in den Strömungskanal gelangt. Diese öff- nungen liegen in derselben Ebene, in der auch die Öffnungen 8 in den Seitenwänden des nach unten geöffneten Behälters liegen.
In symmetrischer Anordnung.. sind in einem Be- lüfteräggregat zwei nach unten geöffnete Behälter 4, 4' durch eine Wand 10 miteinander verbunden: Jeder nach unten geöffnete Behälter hat eine eigene Luft zuführung 1, l' und je zwei Strömungskanäle 6 und 6'. Die Luftdurchtrittsöffnungen 8 in den Seitenwän den der nach unten geöffneten Behälter und die jenigen 7' der Strömungskanäle 6; 6' liegen in einer horizontalen Ebene.
Die nach unten geöffneten Be hälter besitzen Tragleisten 11, 11', die auf den im Klärbecken angebrachten Trägern 12, 12' aufliegen.
Die Fig. <B>5,6</B> und 7 zeigen eine zweckmässige Mög lichkeit der Anordnung einer Vielzahl von paarweise angeordneten, nach unten geöffneten Behältern ge- mäss Fig. 1 bis 4 in einer Kläranlage. Ein zentraler Luftzuführungskanal 13 versorgt über die Anschluss- stücke 15, die horizontalen Leitungen 14 und die vertikalen Leitungen 1 die Behälter mit entsprechend komprimierter Luft..
Die Belüftungsaggregate in Form von--paarweise angeordneten Behältern mit je zwei Strömungskanälen hängen parallel zueinander im Klärbecken, wobei sie mit einer kurzen Seite an der Beckenwand befestigt sind und mit der anderen kurzen Seite etwa bis in die Mitte des Beckens ragen.
Zur optimalen Ausbildung der in Fig. 7 ange deuteten Zirkulationsbewegung des Wasserschlamm gemisches sind Leitwände 16 vorgesehen. Durch entsprechende Formgebung der Becken, besonders hinsichtlich der Ecken 17, lässt sich die Ausbildung von stillen Zonen weitgehend vermeiden und da mit eine homogene Verteilung und Belüftung der Schlammteile erreichen.
Die Luftöffnungen des Strömungskanals und des nach unten geöffneten Behälters können selbstver ständlich in jeder beliebigen, praktisch durchführ baren Form ausgebildet werden.
Ausser den allseitig durch das Wandmaterial be grenzten Luftdurchtrittsöffnungen, wie sie in den Zeichnungen beispielsweise als kreisförmige öffnun- gen angedeutet sind, können diese auch als Ein schnitte am unteren Rand des Strömungskanals bzw. des Behälters ausgebildet werden.
So kann es beispielsweise von fertigungstech nischem Vorteil sein, die Öffnungen als Zacken oder Kuben am unteren Rand des Strömungskanals bzw. des Behälters auszubilden.
Auch die Mündung der Luftleitung kann aus fer tigungstechnischen Gründen weitgehend modifiziert werden. So kann der in Fig. 2, 3 und 4 angedeutete Quader mit .offenen Seitenflächen auch gänzlich weg fallen, so dass die Luftzuleitung nach unten offen in den Behälter führt.
Aeration device for wastewater purification by the activated sludge process The present invention relates to an aeration device for wastewater purification by the activated sludge process.
The activated sludge process is a process for the purification of wastewater and is based on the fact that the wastewater to be cleaned contains sludge particles that are interspersed with bacteria and small living beings of all kinds, whereby a purification of the wastewater is brought about in an analogous manner as this happens in nature for the self-cleaning of rivers and waters: Numerous modern large sewage treatment plants work according to this process, which is also known as a biological process.
In order to develop and maintain the microorganisms, which determine the degree and speed of the cleaning process and thus the throughput of a sewage treatment plant, it is necessary that air is supplied to the sewage sludge mixture (oxygen input). Furthermore, it is essential for the effectiveness of a sewage treatment plant based on the biological process that sedimentation of the sludge parts is prevented (thorough mixing) and their even distribution is guaranteed as long as the biological effect of the microorganisms is required.
The air supply and the sludge distribution are generally caused jointly by the fact that the wastewater to be cleaned is flushed with air in a basin. This air purging can also be done. other reasons, for example to remove gaseous impurities, such as hydrogen sulfide, can be used, although other aspects are then decisive.
Air is generally supplied for the biological cleaning process by blowing air into a basin on one side. The rising air bubbles generate an upward movement of the sewage sludge mixture, which is thereby made to circulate. The air intake occurs both in the zone of rising air bubbles and on the surface of the water. The air can be blown into the basin at different depths and must accordingly be compressed to a greater or lesser extent in order to overcome the hydrostatic water pressure.
The effectiveness of the ventilation depends not only on the amount of air and the air flow, but also on the shape and size of the openings through which the air enters the wastewater, whereby it must also be taken into account that the demands on the pump performance increase if in addition to overcoming the hydrostatic pressure, a hydrodynamic pressure and line resistance caused by an unfavorable arrangement of the air inlet openings must also be overcome.
A common type of air supply is that the air is pressed through filter or frit plates for distribution, while another option is to install tubes in the basin that are provided with air outlet openings.
In addition to the relatively high flow resistance, both arrangements have the disadvantage that the air until the moment of transition into the water is in a space that is closed except for the outlet opening and is therefore usually difficult to access. In operation, it can hardly be avoided that dirt and sludge settle in this, which can then usually only be removed with difficulty.
In the case of the ventilation device according to the invention, these disadvantages are to be eliminated, the aim being also to form a large water-air interface.
The ventilation device according to the present invention has at least one downwardly open container, the interior of which is connected to an air supply line, and is characterized in that at least approximately perpendicular flow channels are provided which have air passage openings.
The ventilation device according to the invention it enables an economical and operationally reliable mode of operation in a surprisingly simple manner.
The formation of air cushions in the containers open at the bottom enables greater utilization of the atmospheric oxygen, as an additional active water-air boundary layer is created without increased air expenditure, which is equivalent to an increased water surface area and improves oxygen uptake.
Since the container is open at the bottom, interference due to contamination in normal operation is also excluded.
Based on the exemplary embodiments shown in the drawings, the inven tion is explained in more detail below. FIGS. 1-4 show a possible embodiment, with FIGS. 2 and 3 showing sections according to the lines II-II and / or .HI-III. An air line 1 leads into the space 5 enclosed by the container 4 that is open at the bottom. The mouth 2 of the air line is a cuboid with two opposite open sides.
The flow channel 6 is formed by the vertical pipe socket 3, which is open at the top and bottom, through the circular air passage openings 7 of which the air from the air cushion formed in the space 5 when air is supplied through the line 1 enters the flow channel. These openings lie in the same plane in which the openings 8 in the side walls of the container that is open at the bottom are also located.
In a symmetrical arrangement... Two downwardly open containers 4, 4 'are connected to one another by a wall 10 in a ventilation unit: each downwardly open container has its own air supply 1, 1' and two flow channels 6 and 6 'each. The air passage openings 8 in the Seitenwän the downwardly open container and those 7 'of the flow channels 6; 6 'lie in a horizontal plane.
The downwardly open loading containers have support strips 11, 11 ', which rest on the carriers 12, 12' mounted in the clarifier.
FIGS. 5, 6 and 7 show an expedient possibility of arranging a multiplicity of containers arranged in pairs and open at the bottom according to FIGS. 1 to 4 in a sewage treatment plant. A central air supply duct 13 supplies the containers with correspondingly compressed air via the connection pieces 15, the horizontal lines 14 and the vertical lines 1.
The aeration units in the form of tanks arranged in pairs, each with two flow channels, hang parallel to one another in the clarifier, with one short side attached to the tank wall and the other short side extending approximately into the middle of the tank.
For optimal formation of the circulating movement of the water sludge mixture indicated in FIG. 7, guide walls 16 are provided. By correspondingly shaping the basins, especially with regard to the corners 17, the formation of silent zones can largely be avoided and a homogeneous distribution and aeration of the sludge parts can be achieved.
The air openings of the flow channel and the container which is open at the bottom can of course be designed in any practical form.
Apart from the air passage openings bounded on all sides by the wall material, as indicated in the drawings, for example as circular openings, these can also be formed as incisions on the lower edge of the flow channel or the container.
For example, it can be advantageous in manufacturing technology to design the openings as spikes or cubes on the lower edge of the flow channel or the container.
The mouth of the air line can also be largely modified for manufacturing reasons. Thus, the cuboid with open side surfaces indicated in FIGS. 2, 3 and 4 can also fall away completely, so that the air supply line leads openly downward into the container.
Claims (1)
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH7709759A CH374600A (en) | 1959-08-18 | 1959-08-18 | Aeration device for wastewater purification using the activated sludge process |
DEG30015A DE1197393B (en) | 1959-08-18 | 1960-07-08 | Device for aerating waste water |
CH1156961A CH387559A (en) | 1959-08-18 | 1961-10-05 | Aeration device for wastewater purification using the activated sludge process |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
CH7709759A CH374600A (en) | 1959-08-18 | 1959-08-18 | Aeration device for wastewater purification using the activated sludge process |
Publications (1)
Publication Number | Publication Date |
---|---|
CH374600A true CH374600A (en) | 1964-01-15 |
Family
ID=4535387
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
CH7709759A CH374600A (en) | 1959-08-18 | 1959-08-18 | Aeration device for wastewater purification using the activated sludge process |
Country Status (2)
Country | Link |
---|---|
CH (1) | CH374600A (en) |
DE (1) | DE1197393B (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2329331A2 (en) * | 1975-10-31 | 1977-05-27 | Laurie Alec Hibburd | GAS AND LIQUID CONTACT DEVICE |
FR2409083A1 (en) * | 1977-11-22 | 1979-06-15 | Venturator Ltd | LIQUID CARBONATION SYSTEM AND ITS MANUFACTURING |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE102009006576A1 (en) * | 2009-01-29 | 2010-08-05 | Nordenskjöld, Reinhart von, Dr.-Ing. | aerator |
Family Cites Families (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE813995C (en) * | 1948-10-02 | 1951-09-17 | Bertram Mueller G M B H | Equipment for fine ventilation or gassing of liquids |
-
1959
- 1959-08-18 CH CH7709759A patent/CH374600A/en unknown
-
1960
- 1960-07-08 DE DEG30015A patent/DE1197393B/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
FR2329331A2 (en) * | 1975-10-31 | 1977-05-27 | Laurie Alec Hibburd | GAS AND LIQUID CONTACT DEVICE |
FR2409083A1 (en) * | 1977-11-22 | 1979-06-15 | Venturator Ltd | LIQUID CARBONATION SYSTEM AND ITS MANUFACTURING |
Also Published As
Publication number | Publication date |
---|---|
DE1197393B (en) | 1965-07-22 |
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