EP0738354B1 - Verfahren und vorrichtung zum behandeln von abwasser - Google Patents

Verfahren und vorrichtung zum behandeln von abwasser Download PDF

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Publication number
EP0738354B1
EP0738354B1 EP95906584A EP95906584A EP0738354B1 EP 0738354 B1 EP0738354 B1 EP 0738354B1 EP 95906584 A EP95906584 A EP 95906584A EP 95906584 A EP95906584 A EP 95906584A EP 0738354 B1 EP0738354 B1 EP 0738354B1
Authority
EP
European Patent Office
Prior art keywords
screen means
flow passage
sewage
conveyor
flow
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
EP95906584A
Other languages
English (en)
French (fr)
Other versions
EP0738354A1 (de
Inventor
Andreas Schelin
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
VA TEKNIK I BORAS AB
Original Assignee
VA TEKNIK I BORAS AB
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 VA TEKNIK I BORAS AB filed Critical VA TEKNIK I BORAS AB
Publication of EP0738354A1 publication Critical patent/EP0738354A1/de
Application granted granted Critical
Publication of EP0738354B1 publication Critical patent/EP0738354B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • E—FIXED CONSTRUCTIONS
    • E02—HYDRAULIC ENGINEERING; FOUNDATIONS; SOIL SHIFTING
    • E02B—HYDRAULIC ENGINEERING
    • E02B8/00—Details of barrages or weirs ; Energy dissipating devices carried by lock or dry-dock gates
    • E02B8/02—Sediment base gates; Sand sluices; Structures for retaining arresting waterborne material
    • E02B8/023—Arresting devices for waterborne materials
    • E02B8/026—Cleaning devices
    • E—FIXED CONSTRUCTIONS
    • E03—WATER SUPPLY; SEWERAGE
    • E03F—SEWERS; CESSPOOLS
    • E03F5/00—Sewerage structures
    • E03F5/14—Devices for separating liquid or solid substances from sewage, e.g. sand or sludge traps, rakes or grates

Definitions

  • the present invention relates to a method for sewage treatment, wherein the sewage is flown along a substantially linear flow passage to pass through screen means in the flow passage and to continue along the flow passage after having passed said screen means.
  • the invention also relates to an apparatus for sewage treatment, including a substantially linear flow passage for the sewage, and screen means in said pasage for continued flow of the sewage in the flow passage after having passed through said screen means.
  • the object of the invention is to eliminate this disadvantage and to separate gravel and sand as well as other heavy trash from the sewage flow at an early stage of the sewage treatment, and in accordance therewith the invention provides a method for sewage treatment wherein the sewage is flown along a substantially linear flow passage, the sewage flow is blocked under whirling adjacent the bottom of said flow passage over a conveyor extending across the flow passage, and is forced to flow upwards towards screen means in the flow passage to continue along the flow passage after having passed said screen means, heavy trash in the sewage being left on the conveyor while light trash is carried onto said screen means to be collected on the inlet side thereof, and trash collected on said screen means is stripped from the screen means and supplied to the conveyor to be conveyed from the flow passage together with said heavy trash.
  • the invention also provides an apparatus for sewage treatment comprising a substantially linear flow passage for the sewage, a conveyor extending across the flow passage at the bottom thereof, means immediately downstream of the conveyor for blocking the sewage flow under whirling adjacent the bottom of the flow passage over the conveyor for depositing heavy trash in the sewage on the conveyor and for re-direction of the flow onto screen means associated with said blocking means, for continued flow of the sewage in the flow passage after having passed through said screen means, and stripper means for stripping trash from said screen means at the inlet side thereof and transfer of said trash to the conveyor.
  • stripper means constructed to move the trash mat formed on the screen means by trash collected thereon, stepwise along the screen means towards said conveyor, a flow passage through the screen means for the sewage then being uncovered at the trailing end of the trash mat.
  • the screen means is sloping in the flow direction of the sewage from an upper end adjacent the surface of the flow towards a lower end closer to the bottom of the flow passage so that the trash mat is displaced downwards in the direction of the conveyor and the opening uncovered in the screen at the trailing end of the trash mat is close to the surface of the sewage flow where the content of trash in the flow is at minimum.
  • FIGS. 1 and 2 there is shown therein a passage 10 for a sewage flow passing through said passage in the direction indicated by an arrow 11.
  • the bottom 12 of the sewage flow passage forms a depression 13 extending transversely across the bottom, and in said depression there is provided a screw conveyor 14 connected to an electric or hydraulic drive motor (not shown) for the operation thereof.
  • Conveyor 14 connects at the discharge end thereof to a screw conveyor 15 externally of flow passage 10 for transporting material forwarded to conveyor 15 from conveyor 14 to external collection means.
  • conveyor 15 is connected to an electric or hydraulic motor (not shown) for the operation thereof.
  • a blocking wall 16 extending over the entire width of the flow passage axially of conveyor 14 and merging by a curved portion 16A into a substantially horizontal portion 16B over conveyor 14 and spaced therefrom.
  • This screen comprises a plurality of flat bars 19 mounted in parallel mutually spaced, FIG 5.
  • Framework 17 includes two channeled guide rails 20 spaced in the transverse direction of flow passage 10, and in each of these guide rails there is displaceably guided a slide 21 which can be displaced in the longitudinal direction of the guide rail.
  • two bell cranks including a lever arm 22 and a lever arm 23 are mounted by means of transverse shafts 24.
  • Arms 22 at each side are interconnected by a link 25 and these arms are also connected by a link 26 to a crank 27 rotatably mounted in the framework and connected to an electric or hydraulic drive motor 30 (shown in Fig. 2 only) over suitable gearing for the rotation thereof.
  • Each arm 23 is pivotally connected to a bar 31, and each pair of these bars located opposite to each other on opposite sides of framework 17 are interconnected by a cross bar 32.
  • each cross bar is provided with flat irons 33 which are uniformly spaced in the transverse direction thereof to be located in the space between flat irons 19 in parallel therewith. Some or all of flat irons 33 have saw-toothed barbs 34 spaced along the edge thereof, which have the sloping flank facing away from conveyor 14. On bars 31 of one pair of such bars there is fixedly mounted a flange 35 forming a rectangular notch 36, and an abutment 37 fixedly mounted to the associated slide 21 is received by notch 36.
  • Trash that is lighter than water such as paper, rags, leaves, plant parts etc will be carried along the screen 18 and will be trapped by the screen when the sewage is passing therethrough to form a trash mat on the inlet side thereof.
  • This mat is indicated by a dot-and-dash line 38 in FIGS. 3 and 4.
  • the mat of collected trash on the screen will form a filter for the sewage passing through the screen, and as the thickness of the trash mat is increasing the resistance against flow through the screen will increase. Increasing flow resistance will cause a higher level of sewage at the upstream side of the screen than on the downstream side. It may be assumed that the upstream sewage level is at the dot-and-dash line 39 in FIG.
  • crank bells 22, 23 initially will be pivoted clockwise, which means that flange 35 will be engaged with abutment 37 at the lower side thereof at 44 as is shown in FIG. 4.
  • barbs 34 will be withdrawn from trash mat 38 to a position in which barbs 34 are located above the lower edge of irons 19 as is also shown in FIG. 4.
  • slides 21 and irons 33 will be displaced along irons 19 in the direction of arrow 43 but due to the fact that barbs 34 are disengaged from trash mat 38 this will remain stationary during this stroke of irons 33 which is thus an idle stroke.
  • Motor 30 can be energized under the control of a level detector e.g. a float switch when level 39 is reached, and it can be de-energized e.g. by a float switch at level 45 or in dependence of a timer that keeps motor 30 energized substantially for the period necessary in order that level 45 shall be reached.
  • a new filter mat will eventually be formed over the portion of the screen that has been opened up by the operations described and when level 39 is reached again these operations will be repeated as described.
  • the apparatus of the invention is provided in a flow passage with sewage continuously flowing along said passage.
  • method and apparatus of the invention can be used also for treating sewage sucked from a septic tank or a three-compartment tank into a container truck.
  • the apparatus is mounted in a tank with an inlet for supplying the sewage from the container truck along the bottom of the tank against blocking element 16 in the direction of arrow 11.
  • the invention is not limited to the embodiment described.
  • the apparatus can be modified with regard to the technical details thereof and still be suitable for practising the method of the invention.
  • the drive mechanism for the stripper means including cranks can be replaced by an hydraulic ram for reciprocating movement connected to the bell crank system.
  • Conveyor 15 can be replaced by a belt conveyor, and this conveyor can transport the trash deposited thereon either to an external container or to an apparatus for compressing the trash.
  • the drive mechanism for irons 33 can be replaced by any other mechanism known in the art which imparts to said irons a longitudinal translation at a lower level in one direction of translation and at a higher level in the other direction of translation, the irons being shifted from one level to the other when the direction is being reversed.

Landscapes

  • Engineering & Computer Science (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Public Health (AREA)
  • Water Supply & Treatment (AREA)
  • Sewage (AREA)
  • Filtration Of Liquid (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Activated Sludge Processes (AREA)

Claims (12)

  1. Verfahren zur Abwasserbehandlung, wobei das Abwasser entlang einer im wesentlichen linearen Durchflußpassage (10) stromt, durch ein Filtermittel (18) in der Durchflußpassage läuft und nach Durchlaufen des Filtermittels weiter durch die Durchflußpassage strömt, dadurch gekennzeichnet, daß die Abwasserströmung unter Umwirbelung nahe dem Boden (12) der besagten Durchflußpassage (10) über ein sich quer zur Durchflußpassage erstreckendes Fördermittel (14) blockiert und nach oben zum Strömen zu dem besagten Filtermittel (18) veranlaßt wird, wobei schwere Bestandteile im Abwasser auf dem Fördermittel verbleiben und leichte Bestandteile zum Filtermittel getragen werden, um auf dessen Einlaßseite gesammelt zu werden, und daß die auf dem besagten Filtermittel (18) gesammelten leichten Bestandteile vom Filtermittel abgestreift und dem Fördermittel (14) zugeführt werden, um zusammen mit den schweren Bestandteilen aus der Durchflußpassage transportiert zu werden.
  2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß eine von den auf dem Filtermittel gesammelten Bestandteilen gebildete Matte von dem Filtermittel nach unten in Richtung zum Fördermittel (14) abgestreift wird, wobei eine Öffnung in dem besagten Filtermittel am hinteren Ende der Matte nahe der Oberfläche der Abwasserströmung frei wird.
  3. Verfahren nach Anspruch 1 oder 2, dadurch gekennzeichnet, daß das Abwasser direkt vor dem Blockieren der Strömung nahe dem Boden (12) der Durchflußpassage (10) in eine Vertiefung im Boden fließt, worin sich das Fördermittel (14) befindet.
  4. Verfahren nach einem der Ansprüche 1 bis 3, dadurch gekennzeichnet, daß die Abwasserströmung nahe dem Boden (12) der Durchflußpassage (10) durch Blockieren des Durchflusses einer Umlenkung um etwa 180° unterworfen wird.
  5. Verfahren nach einem der Ansprüche 1 bis 4, dadurch gekennzeichnet, daß das Abstreifen der Bestandteile vom Filtermittel (18) bei einem vorgegebenen Abwasserstand in der Durchflußpassage (10) vor dem Filtermittel veranlaßt wird.
  6. Vorrichtung zur Abwasserbehandlung zum Durchführen des Verfahrens nach den Ansprüchen 1 bis 5, mit einer im wesentlichen linearen Durchflußpassage (10) für das Abwasser und Filtermitteln (18) in der besagten Durchflußpassage zum Weiterströmen des Abwassers in der Durchflußpassage nach Durchlaufen des besagten Filtermittels (18), gekennzeichnet durch ein sich quer zur Durchflußpassage (10) an dessen Boden (12) erstreckendes Fördermittel (14), Mittel (16) in Strömungsrichtung direkt hinter dem Fördermittel (14) zum Blockieren der Abwasserströmung unter Umwirbelung nahe dem Boden der Durchflußpassage (10) über dem Fördermittel zur Ablagerung schwerer Bestandteile im Abwasser auf dem Fördermittel und zur Umlenkung der Strömung in das besagte, dem Blockiermittel (16) zugeordnete Filtermittel (18), und Abstreifmittel (33) zum Abstreifen der Bestandteile von dem besagten Filtermittel (18) an dessen Einlaß und zum Übertragen der besagten Bestandteile zum Fördermittel (14).
  7. Vorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß das besagte Filtermittel (18) mit einem seiner Enden im oberen Teil der Durchflußpassage (10) und mit dem anderen Ende im unteren Teil der Durchflußpassage angebracht ist, und daß die besagten Abstreifmittel (33) zum Hin-und Herbewegen zwischen den besagten Enden geführt ist.
  8. Vorrichtung nach Anspruch 7, dadurch gekennzeichnet, daß die besagten Filtermittel (18) in Längsrichtung der Durchflußpassage (10) geneigt ist, indem es von dem besagten einen Ende zu dem besagten anderen Ende zum Fördermittel (14) hin abfällt.
  9. Vorrichtung nach Anspruch 7 oder 8, dadurch gekennzeichnet, daß besagte Abstreifmittel (33) zum Abstreifen des Filtermittels (18) betriebsbereit sind, wenn es sich von dem besagten einen Ende zum anderen Ende des besagten Filtermittels bewegt, und in der entgegengesetzten Richtung nicht betriebsbereit ist.
  10. Vorrichtung nach einem der Ansprüche 6 bis 9, dadurch gekennzeichnet, daß das besagte Filtermittel (18) ein Gitter von parallelen Schienen (19) aufweist, die in Querrichtung gegeneinander beabstandet sind, und daß das Abstreifmittel Schienen (33) aufweist, welche verschiebbar zwischen den besagten Schienen (19) des Filtermittels (18) parallel dazu angebracht sind.
  11. Vorrichtung nach Anspruch 10, dadurch gekennzeichnet, daß die Schienen (33) des besagten Abstreifmittels mit einem Antriebsmechanismus zum Übertragen einer Translationsbewegung auf die besagten Schienen entlang den Schienen (19) des Filtermittels (18) zu einer geringeren Höhe in einer Richtung und zu einer größeren Höhe in der anderen Richtung verbunden sind.
  12. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, daß die Schienen (33) des besagten Abstreifmittels gegenüber der Einlaßseite des Filtermittels (18) mit Haken (34) an den Kanten versehen sind, welche über die Kanten der Schienen (19) des Filtermittels gegenüber dessen Einlaßseite an der Position der besagten geringeren Höhe hinausragen.
EP95906584A 1994-01-13 1995-01-13 Verfahren und vorrichtung zum behandeln von abwasser Expired - Lifetime EP0738354B1 (de)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
SE9400067A SE501160C2 (sv) 1994-01-13 1994-01-13 Förfarande för rening av avloppsvatten medelst tvingande virvling av inkommande vatten och anordning för genomförande av förfarandet
SE9400067 1994-01-28
PCT/SE1995/000031 WO1995019471A1 (en) 1994-01-13 1995-01-13 Method and apparatus for sewage treatment

Publications (2)

Publication Number Publication Date
EP0738354A1 EP0738354A1 (de) 1996-10-23
EP0738354B1 true EP0738354B1 (de) 1997-09-17

Family

ID=20392542

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95906584A Expired - Lifetime EP0738354B1 (de) 1994-01-13 1995-01-13 Verfahren und vorrichtung zum behandeln von abwasser

Country Status (6)

Country Link
EP (1) EP0738354B1 (de)
AT (1) ATE158367T1 (de)
AU (1) AU1469795A (de)
DE (1) DE69500734D1 (de)
SE (1) SE501160C2 (de)
WO (1) WO1995019471A1 (de)

Families Citing this family (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO1998017875A1 (en) * 1996-10-23 1998-04-30 Ecosol Pty. Ltd. Gross pollution filter
GB9701093D0 (en) * 1997-01-20 1997-03-12 Tj Brent Limited Raked bar screen
GB9806071D0 (en) * 1998-03-20 1998-05-20 Tj Brent Limited Raked bar screen
DE19920074C2 (de) * 1999-05-03 2003-12-18 Hans Huber Ag Masch & Anlagenb Vorrichtung zum Abscheiden und Herausfördern von Abscheidegut aus einer strömenden Flüssigkeit
EP2116649A3 (de) 2008-05-05 2011-07-13 Jörg-Michael Dipl.-Ing. Steinhardt Rechenvorrichtung mit einer Einrichtung zur Räumung des Rechenguts

Also Published As

Publication number Publication date
ATE158367T1 (de) 1997-10-15
EP0738354A1 (de) 1996-10-23
DE69500734D1 (de) 1997-10-23
AU1469795A (en) 1995-08-01
SE9400067L (sv) 1994-11-28
WO1995019471A1 (en) 1995-07-20
SE9400067D0 (sv) 1994-01-13
SE501160C2 (sv) 1994-11-28

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