EP0280648B1 - Cleaning device for sewage treatment basins - Google Patents

Cleaning device for sewage treatment basins Download PDF

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Publication number
EP0280648B1
EP0280648B1 EP88810055A EP88810055A EP0280648B1 EP 0280648 B1 EP0280648 B1 EP 0280648B1 EP 88810055 A EP88810055 A EP 88810055A EP 88810055 A EP88810055 A EP 88810055A EP 0280648 B1 EP0280648 B1 EP 0280648B1
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EP
European Patent Office
Prior art keywords
water
process water
clarification
injector
outlet
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 - Lifetime
Application number
EP88810055A
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German (de)
French (fr)
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EP0280648A1 (en
Inventor
Werner Nill
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Individual
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Individual
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Publication date
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Priority to AT88810055T priority Critical patent/ATE60529T1/en
Publication of EP0280648A1 publication Critical patent/EP0280648A1/en
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    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/10—Collecting-tanks; Equalising-tanks for regulating the run-off; Laying-up basins
    • E03F5/105—Accessories, e.g. flow regulators or cleaning devices
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B08—CLEANING
    • B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
    • B08B9/00—Cleaning hollow articles by methods or apparatus specially adapted thereto 
    • B08B9/08—Cleaning containers, e.g. tanks
    • B08B9/093—Cleaning containers, e.g. tanks by the force of jets or sprays
    • B08B9/0933—Removing sludge or the like from tank bottoms

Definitions

  • the invention relates to a cleaning system for pools in sewage treatment plants according to the preamble of the claim.
  • the invention further relates to a method for cleaning basins in sewage treatment plants according to the preamble of claim 4.
  • a pump draws dirty water from the basin near the bottom or from the drainage shaft and directs it through the nozzle of an injector.
  • a standpipe is connected to the injector, which extends above the maximum water level, through which air is sucked in and mixed in the injector with the water drawn in by the pump.
  • the water mixed with air is expelled parallel to the bottom of the pool and whirls up the solids contained in the water.
  • the rising air bubbles carry these solid bodies along with the surface.
  • This device can be used to prevent deposits of solids in the circulator area of the water-air flow, but not in the corners of the mostly rectangular basins. Furthermore, the cleaning effect of the water jet decreases the further the water level in the pool drops and consequently the proportion of solids increases. If the water level falls below a minimum value, for example 15 cm, the effect of the device drops to an uneconomical level. It is therefore not possible to keep the basin absolutely clean after it has been completely emptied. The degree of purity of the walls and floor can never exceed that of the waste water used. Additional cleaning from a different type is therefore necessary.
  • the invention seeks to remedy this.
  • the invention solves the problem of designing the above-described procedure and the above-mentioned cleaning device in such a way that cleaning down to zero water level is also possible, and there is also a guarantee that the deposits will also be deposited in the corners of the basin of solids is prevented.
  • process water present in the system is added to the water jet generated by the pump instead of or in addition to the air, and thus the rinse water is diluted until it is also pumped no more solids are sucked in and the pool floor is only rinsed with process water.
  • Service water is the clarified, possibly still cloudy water at the outlet of a sewage treatment plant.
  • a conventional suction pump 5 is installed in the emptying shaft 1 of a basin 3 of a water purification system.
  • the pressure side (pipe 6) is connected to an injector 7, which is attached little above the bottom 9 of the basin 3.
  • a standpipe 11, which projects above the maximum water level h1 is connected to the injector 7.
  • a spray tube 13 is attached to the injector 7, which can be attached to the injector 7 so that it can pivot about a vertical axis A.
  • the standpipe 11 At the upper end of the standpipe 11 there is a three-way slide 15, the first outlet 17 of which is open to the atmosphere and the second outlet 19 of which is connected to a container containing process water.
  • the entrance is connected to the standpipe 11.
  • a servo drive 23 is attached to the slide 15 and is connected to a float switch 25.
  • the pump is operated at a water level between h1 (maximum) and h2 in a conventional manner by continuously or at intervals by means of the pump 5 sucking dirty water out of the emptying shaft and mixing it in the injector 7 with air sucked in through the standpipe 11 and along the bottom 9 is passed into the basin 3.
  • the slide 15 connects the standpipe 11 to the first outlet 17 to the atmosphere.
  • the three-way slide 15 is actuated by the float or level switch 25 and, instead of the opening 17, the line 19 to the service water tank 21 is connected to the standpipe, so that the pump 5 connects it to At high speed through the injector 7, water instead of air is now sucked in service water and added to the dirty water from the drainage shaft.
  • the process water drawn in through the standpipe subsequently dilutes the heavily polluted water in the basin 3, successively until finally only process water free of dirt emerges from the spray pipe 13.
  • the three-way slide 15 can also be attached to the injector 7 and a separate supply line for process water can be provided.
  • the process water used for dilution is available in an unlimited amount in a sewage treatment plant.
  • the pump and injector are cleaned at the same time.
  • the air can also stand dig industrial water. With the highest requirements, drinking water can also be used at the end.
  • the spray tube 13 can be swung back and forth during cleaning with process water.
  • the design of the drive for the pivoting movement of the spray tube 13 is not the subject of the invention and is therefore not described in detail. It should only be noted that the drive movement can be carried out by an external motor or by an internal mechanism driven by the flow energy of the water, as in the case of agricultural irrigation bearings.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Hydroponics (AREA)
  • Apparatuses For Bulk Treatment Of Fruits And Vegetables And Apparatuses For Preparing Feeds (AREA)
  • Cleaning In General (AREA)
  • Cultivation Receptacles Or Flower-Pots, Or Pots For Seedlings (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)

Abstract

Mounted on the stand pipe (11) of the injector (7) of a suction pump (5) in a sewage treatment basin (3) is a three-way valve (15) through which service water is fed through the stand pipe (11) into the injector (7) instead of, or together with, air if the level of the water in the basin (1) falls below a minimum value (h2). <IMAGE>

Description

Gegenstand der Erfindung ist eine Reinigungsanlage für Becken in Kläranlagen gemäss Oberbegriff des Patentanspruches.The invention relates to a cleaning system for pools in sewage treatment plants according to the preamble of the claim.

Gegenstand der Erfindung ist weiter ein Verfahren zum Reinigen von Becken in Kläranlagen gemäss Oberbegriff des Patentanspruches 4.The invention further relates to a method for cleaning basins in sewage treatment plants according to the preamble of claim 4.

Es ist bereits bekannt, z.B. aus der DE-A-3418710, in Kläranlagen die Becken mittels eines in Bodennähe angeordneten, mit Luft vermischten Wasserstrahles das Absinken von Schwebestoffen und Festsetzen derselben auf den Boden des Beckens zu verhindern.It is already known, e.g. from DE-A-3418710, in wastewater treatment plants to prevent the sinking of suspended matter and the settling thereof on the bottom of the basin by means of a water jet arranged near the ground and mixed with air.

Dazu wird mit einer Pumpe Schmutzwasser aus dem Becken in Bodennähe oder aus dem Entleerungsschacht angesaugt und durch die Düse eines Injektors geleitet. Am Injektor ist ein Standrohr angeschlossen, das über den maximalen Wasserstand hinausragt, durch das Luft eingesaugt und im Injektor mit dem von der Pumpe angesaugten Wasser vermischt wird.To do this, a pump draws dirty water from the basin near the bottom or from the drainage shaft and directs it through the nozzle of an injector. A standpipe is connected to the injector, which extends above the maximum water level, through which air is sucked in and mixed in the injector with the water drawn in by the pump.

Das mit Luft vermischte Wasser wird parallel zum Boden des Beckens ausgestossen und wirbelt auf diese Weise im Wasser enthaltene Festkörper auf. Die aufsteigenden Luftblasen reissen diese Festkörper zusätzlich zur Oberfläche mit.The water mixed with air is expelled parallel to the bottom of the pool and whirls up the solids contained in the water. The rising air bubbles carry these solid bodies along with the surface.

Mit dieser Vorrichtung lässt sich wohl im Zirkulatorsbereich des Wasser-Luft-Stromes eine Ablagerung von Feststoffen verhindern, nicht aber in den Ecken der meist rechteckig gestalteten Bekken. Des weiteren verringert sich die reinigende Wirkung des Wasserstrahles je weiter der Wasserspiegel im Becken sinkt und folglich der Anteil an Festkörpern ansteigt. Fällt der Wasserspiegel unter einen minimalen Wert, beispielsweise 15 cm, so sinkt die Wirkung der Vorrichtung auf ein unwirtschaftliches Mass ab. Es ist folglich nicht möglich, das Becken nach der vollständigen Entleerung absolut sauber zu bekommen. Der Reinheitsgrad der Wände und des Bodens kann nie denjenigen des benutzten Schmutzwassers übersteigen. Eine zusätzliche Reinigung aus andere Art wird damit notwendig.This device can be used to prevent deposits of solids in the circulator area of the water-air flow, but not in the corners of the mostly rectangular basins. Furthermore, the cleaning effect of the water jet decreases the further the water level in the pool drops and consequently the proportion of solids increases. If the water level falls below a minimum value, for example 15 cm, the effect of the device drops to an uneconomical level. It is therefore not possible to keep the basin absolutely clean after it has been completely emptied. The degree of purity of the walls and floor can never exceed that of the waste water used. Additional cleaning from a different type is therefore necessary.

Eine Verwendung von sauberem Wasser für den Vorgang ist aus Kostengründen nicht machbar.The use of clean water for the process is not feasible for cost reasons.

Hier will die Erfindung Abhilfe schaffen.The invention seeks to remedy this.

Die Erfindung, wie sie in den Ansprüchen gekennzeichnet ist, löst die Aufgabe, das oben geschilderte Vorgehen und die obengenannte Reinigungsvorrichtung derart auszubilden, dass auch eine Reinigung bis zum Wasserstand Null möglich und zudem Gewähr geboten ist, dass auch in den Ecken des Beckens die Ablagerung von Feststoffen verhindert wird.The invention, as characterized in the claims, solves the problem of designing the above-described procedure and the above-mentioned cleaning device in such a way that cleaning down to zero water level is also possible, and there is also a guarantee that the deposits will also be deposited in the corners of the basin of solids is prevented.

Die durch die Erfindung erreichten Vorteile sind im wesentlichen darin zu sehen, dass nach Unterschreiten eines vorgebbaren minimalen Wasserstandes in der Anlage vorhandenes Brauchwasser dem von der Pumpe erzeugten Wasserstrahl anstelle von oder zusätzlich zur Luft beigegeben und somit das Spülwasser verdünnt wird, bis auch durch die Pumpe keine Feststoffe mehr angesaugt werden und der Beckenboden nur noch mit Brauchwasser gespült wird. Unter Brauchwasser wird das geklärte, allenfalls noch trübe Wasser am Ausfluss einer Kläranlage verstanden.The advantages achieved by the invention are essentially to be seen in the fact that after falling below a predeterminable minimum water level in the system, process water present in the system is added to the water jet generated by the pump instead of or in addition to the air, and thus the rinse water is diluted until it is also pumped no more solids are sucked in and the pool floor is only rinsed with process water. Service water is the clarified, possibly still cloudy water at the outlet of a sewage treatment plant.

Im folgenden wird die Erfindung anhand von lediglich einen Ausführungsweg darstellenden Zeichnungen näher erläutert. Es zeigt die einzige Figur eine Ansicht der Vorrichtung in einem Bekken einer Kläranlage.The invention is explained in more detail below with the aid of drawings which illustrate only one embodiment. The sole figure shows a view of the device in a basin of a sewage treatment plant.

Im Entleerungsschacht 1 eines Beckens 3 einer Wasserreinigungsanlage ist eine Saugpumpe 5 herkömmlicher Bauart aufgestellt.In the emptying shaft 1 of a basin 3 of a water purification system, a conventional suction pump 5 is installed.

Die Druckseite (Rohrleitung 6) ist mit einem Injektor 7 verbunden, der wenig über dem Boden 9 des Beckens 3 befestigt ist. Ein Standrohr 11, das über den maximalen Wasserspiegel h1 hinausragt, ist mit dem Injektor 7 verbunden. Ausgangsseitig ist am Injektor 7 ein Sprührohr 13 befestigt, welches um eine vertikale Achse A schwenkbar am Injektor 7 angebracht sein kann.The pressure side (pipe 6) is connected to an injector 7, which is attached little above the bottom 9 of the basin 3. A standpipe 11, which projects above the maximum water level h1, is connected to the injector 7. On the output side, a spray tube 13 is attached to the injector 7, which can be attached to the injector 7 so that it can pivot about a vertical axis A.

Am oberen Ende des Standrohres 11 ist ein Dreiwegschiebar 15 aufgesetzt, dessen erster Ausgang 17 zur Atmosphäre hin offen und dessen zweiter Ausgang 19 mit einem Brauchwasser enthaltenden Behälter verbunden ist. Der Eingang ist mit dem Standrohr 11 verbunden. Am Schieber 15 ist ein Servoantrieb 23 angebracht, der in Verbindung mit einem Schwimmerschalter 25 steht.At the upper end of the standpipe 11 there is a three-way slide 15, the first outlet 17 of which is open to the atmosphere and the second outlet 19 of which is connected to a container containing process water. The entrance is connected to the standpipe 11. A servo drive 23 is attached to the slide 15 and is connected to a float switch 25.

Im folgenden wird die Arbeitsweise der Reinigungsvorrichtung kurz beschrieben.The operation of the cleaning device is briefly described below.

Der Betrieb der Pumpe erfolgt bei einem Wasserstand zwischen h1 (Maximum) und h2 in herkömmlicher Weise, indem dauernd oder in Intervallen mittels der Pumpe 5 Schmutzwasser aus dem Entleerungsschacht angesaugt und im Injektor 7 mit durch das Standrohr 11 angesaugter Luft vermischt und entlang dem Boden 9 in das Becken 3 geleitet wird. Der Schieber 15 verbindet das Standrohr 11 mit den ersten Ausgang 17 mit der Atmosphäre.The pump is operated at a water level between h1 (maximum) and h2 in a conventional manner by continuously or at intervals by means of the pump 5 sucking dirty water out of the emptying shaft and mixing it in the injector 7 with air sucked in through the standpipe 11 and along the bottom 9 is passed into the basin 3. The slide 15 connects the standpipe 11 to the first outlet 17 to the atmosphere.

Sobald der Wasserstand die Höhe h2 (einstellbare minimale Höhe) unterschreitet, wird durch den Schwimmer- oder Niveauschalter 25 der Dreiwegschieber 15 betätigt und anstelle der Öffnung 17 die Leitung 19 zum Brauchwasserbehälter 21 mit dem Standrohr verbunden, so dass durch das von der Pumpe 5 mit hoher Geschwindigkeit durch den Injektor 7 geleitete Wasser anstelle von Luft nun Brauchwasser angesaugt und dem Schmutzwasser aus dem Entleerungsschacht beigefügt wird. Das durch das Standrohr angesaugte Brauchwasser verdünnt in der Folge das im Bekken 3 befindliche stark verschmutzte Wasser sukzessive bis schlussendlich nur noch von Schmutz freies Brauchwasser aus dem Sprührohr 13 austritt. Selbstverständlich kann der Dreiwegschieber 15 auch am Injektor 7 angebracht sein und eine separate Zufuhrleitung für Brauchwasser vorgesehen werden.As soon as the water level falls below the height h2 (adjustable minimum height), the three-way slide 15 is actuated by the float or level switch 25 and, instead of the opening 17, the line 19 to the service water tank 21 is connected to the standpipe, so that the pump 5 connects it to At high speed through the injector 7, water instead of air is now sucked in service water and added to the dirty water from the drainage shaft. The process water drawn in through the standpipe subsequently dilutes the heavily polluted water in the basin 3, successively until finally only process water free of dirt emerges from the spray pipe 13. Of course, the three-way slide 15 can also be attached to the injector 7 and a separate supply line for process water can be provided.

Das für die Verdünnung verbrauchte Brauchwasser ist in einer Kläranlage in unbeschränkter Menge vorhanden.The process water used for dilution is available in an unlimited amount in a sewage treatment plant.

Zugleich wird die Pumpe und der Injektor gereinigt. Selbstverständlich kann der Luft auch ständig Brauchwasser beigemengt werden. Bei höchsten Anforderungen kann auch am Schluss Trinkwasser benützt werden.The pump and injector are cleaned at the same time. Of course, the air can also stand dig industrial water. With the highest requirements, drinking water can also be used at the end.

Um die Wirkung des Wasserstrahles zu erhöhen, kann das Sprührohr 13 während der Reinigung mit Brauchwasser hin- und hergeschwenkt werden. Die Ausgestaltung des Antriebes für die Schwenkbewegung des Sprührohres 13 ist nicht Gegenstand der Erfindung und wird deshalb nicht näher beschrieben. Es sei dazu nur bemerkt, dass die Antriebsbewegung durch einen externen Motor oder durch einen internen, von der Fliessenergie des Wassers angetriebenen Mechanismus erfolgen kann, wie bei Bewässerungslager in der Landwirtschaft.In order to increase the effect of the water jet, the spray tube 13 can be swung back and forth during cleaning with process water. The design of the drive for the pivoting movement of the spray tube 13 is not the subject of the invention and is therefore not described in detail. It should only be noted that the drive movement can be carried out by an external motor or by an internal mechanism driven by the flow energy of the water, as in the case of agricultural irrigation bearings.

Claims (6)

1. Cleaning device for basins in clarification plants with a suction pump (5) arranged in the deepest position in the drain shaft (1), an injector (7) for sucking out the air through a standpipe (11), as well as a spray pipe (13), characterized in that a three way gate valve (15) is fitted on the standpipe (11), the first outlet of which (17) is connected with the atmosphere and the second outlet (19) of which is connected with a process water tank, whereby, under the term process water, the clarified, but still cloudy water in the outlet of a clarification plant is meant.
2. Cleaning device for basins in clarification plants according to Claim 1, characterized in that the gate valve (15) is provided with an operating device (servomotor 23), which can be actuated from a water level independent switching element (level switch 25).
3. Cleaning device for basins in clarification plants according to one of the Claims 1 or 2, characterized in that the spray pipe (13) is fastened so that it can swivel on the injector (7).
4. Method for the cleaning of the bottoms of tanks in clarification plants with a stream of water mixed with air, characterized in that when the waste water falls short of a minimum water level (h2) process water is added to the stream of waste water, whereby, under the term process water, the clarified, but still cloudy water in the outlet of a clarification plant is meant.
5. Method according to Claim 4, characterized in that air and process water are introduced simultaneously.
6. Method for cleaning the bottoms of tanks in clarification plants according to the Claims 4 or 5, characterized in that the pump (5) continues to suck in process water through the standpipe (11) until the drain shaft (1) contains substantially process water only.
EP88810055A 1987-02-24 1988-02-01 Cleaning device for sewage treatment basins Expired - Lifetime EP0280648B1 (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AT88810055T ATE60529T1 (en) 1987-02-24 1988-02-01 CLEANING DEVICE FOR BASIN IN SEWAGE TREATMENT PLANTS.

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CH70087 1987-02-24
CH700/87 1987-02-24

Publications (2)

Publication Number Publication Date
EP0280648A1 EP0280648A1 (en) 1988-08-31
EP0280648B1 true EP0280648B1 (en) 1991-01-30

Family

ID=4193128

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88810055A Expired - Lifetime EP0280648B1 (en) 1987-02-24 1988-02-01 Cleaning device for sewage treatment basins

Country Status (3)

Country Link
EP (1) EP0280648B1 (en)
AT (1) ATE60529T1 (en)
DE (1) DE3861685D1 (en)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3822515A1 (en) * 1988-07-04 1990-01-11 Klein Schanzlin & Becker Ag METHOD FOR CLEANING LIQUID TANKS
DE29905492U1 (en) * 1999-03-25 1999-07-08 KSB AG, 67227 Frankenthal Device for keeping a liquid container clean
EP1222955A1 (en) * 2001-01-11 2002-07-17 KSB Aktiengesellschaft Device for stationary attaching an aggregate
DE102007024017A1 (en) * 2007-05-22 2008-11-27 Ksb Aktiengesellschaft Device and method for monitoring a cleaning and / or ventilation system

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2701190A1 (en) * 1977-01-13 1978-07-20 Willi J Grimm Rain water overflow basin cleaning system - has travelling bridge with scraper blade and water supply pipes for spray nozzles
DE2902983C2 (en) * 1979-01-26 1980-09-18 Franz-Josef Dipl.-Ing. 6530 Bingen Baum Water storage basin
DE3418710A1 (en) * 1984-05-19 1985-11-21 Oskar Vollmar GmbH, 7000 Stuttgart Jet cleaner
DE3418714A1 (en) * 1984-05-19 1985-11-21 Oskar Vollmar GmbH, 7000 Stuttgart Installation for supplying a cleaning device for rainwater tanks or the like with flushing water

Also Published As

Publication number Publication date
EP0280648A1 (en) 1988-08-31
DE3861685D1 (en) 1991-03-07
ATE60529T1 (en) 1991-02-15

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