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EP0194996B1 - Method and apparatus for obtaining a high content of solid matter in the dewatering of sludges - Google Patents

Method and apparatus for obtaining a high content of solid matter in the dewatering of sludges Download PDF

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Publication number
EP0194996B1
EP0194996B1 EP86890058A EP86890058A EP0194996B1 EP 0194996 B1 EP0194996 B1 EP 0194996B1 EP 86890058 A EP86890058 A EP 86890058A EP 86890058 A EP86890058 A EP 86890058A EP 0194996 B1 EP0194996 B1 EP 0194996B1
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EP
European Patent Office
Prior art keywords
belt
press
pressure press
pressure
sieve
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
EP86890058A
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German (de)
French (fr)
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EP0194996A2 (en
EP0194996A3 (en
Inventor
Franz Lichtenegger
Josef Dipl.-Ing. Beigl
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.)
SGP-VA ENERGIE- UND UMWELTTECHNIK GESELLSCHAFT M.B
Original Assignee
Sgp-Va Energie- und Umwelttechnik GmbH
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Publication of EP0194996A2 publication Critical patent/EP0194996A2/en
Publication of EP0194996A3 publication Critical patent/EP0194996A3/en
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B30—PRESSES
    • B30B—PRESSES IN GENERAL
    • B30B9/00—Presses specially adapted for particular purposes
    • B30B9/02—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material
    • B30B9/24—Presses specially adapted for particular purposes for squeezing-out liquid from liquid-containing material, e.g. juice from fruits, oil from oil-containing material using an endless pressing band
    • B30B9/243—The squeezing-out being performed in several stages

Definitions

  • Dewatering of sludge is usually carried out by means of screen belt presses, in which the sludge is passed between screen belts via dewatering drums.
  • screen belt presses in which the sludge is passed between screen belts via dewatering drums.
  • the dried sludge can be used for fertilizer purposes, for example.
  • the invention now relates to a method for achieving a high dry content in the dewatering of sludge, in particular sewage sludge, the sludge being dewatered first in a belt press and then in a downstream high-pressure press, the sludge emerging from the belt press being crushed and the crushed material is distributed, layered and fed to the high-pressure press and onto a device for carrying out such a method.
  • the object of the invention is to increase the dry matter content of the dewatered sludge while at the same time producing a high-quality complete fertilizer.
  • the method according to the invention essentially consists in adding substances that enhance the fertilizer, such as nitrogen, phosphorus and / or potassium, to the comminuted material in order to produce fertilizer.
  • substances that enhance the fertilizer such as nitrogen, phosphorus and / or potassium
  • the shredded material By adding substances that enhance the fertilizer, such as nitrogen, phosphorus and / or potassium, to the shredded material, it is possible to produce a high quality complete fertilizer. Since the sludge cake emerging from the belt filter press is crushed and the crushed material is distributed and rearranged before it is fed to the high-pressure press, the substances that enhance the fertilizer appear well distributed in the dried sludge.
  • an approximately horizontal conveyor belt leading to the entrance of the high-pressure press is arranged below the shredding roller, above which a distribution screw is arranged in the conveying direction behind the shredding roller, the axis of which is approximately parallel to the axis of the shredding roller.
  • the shredded material is distributed over the width of the conveyor belt and thereby shifted through this distribution screw, which preferably has right-handed and left-handed screw flights.
  • the inside of the mud cake has a greater moisture content than on its surface, since the surface of the mud cake was most effectively dewatered in the upstream sieve belt press.
  • the layering now mixes the particles with a greater moisture content with the particles with a lower moisture content.
  • the feed belt press has a feed hopper for the sludge cake and a rotating shredding roller.
  • the feed hopper feeds the sludge cake to the shredding roller, which causes the shredding.
  • the tear roller is preferably equipped with teeth which engage between fixed teeth on a wall connected to the feed hopper.
  • the mud cake usually contains fibrous parts and these are effectively torn apart by the interlocking teeth.
  • a height-adjustable scraper is expediently arranged in the conveying direction behind the distribution screw, so that the layer height can be made more uniform on the one hand and on the other hand the amount of sludge cake and the height of the inlet slot of the high-pressure press can be adjusted.
  • the scraper is expediently shaped in the shape of an arrow with an arrowhead pointing in the opposite direction to the conveying direction, which improves the distribution effect.
  • a pressure roller which limits the layer height can also be provided.
  • the high-pressure press is designed separately from the wire belt press, four wire belts are required, namely the lower belt and the upper belt of the wire belt press and the lower belt and the upper belt of the high pressure press.
  • These four sieve belts represent a certain outlay and separate drive devices are also required for these sieve belts. According to a preferred embodiment of the invention, however, the arrangement can also be such that a sieve belt, etc.
  • the sieve belt emerging from the wire belt press as the lower belt is guided over the entire belt press and the downstream high pressure press, that separate upper belts are provided in the area of the belt press and the downstream high pressure press and that at the discharge point between the common Lower belt and the upper belt of the upstream sieve belt press the filter cake is applied to the lower belt at a point before it enters the high-pressure press, with the devices for comminuting the.
  • Behind the discharge point between the common lower belt and the upper belt of the sieve belt press and the application point on the common lower belt Filter cake and the distribution and layering of the material are arranged.
  • the drive of the belt press and high pressure press is also simplified in this case.
  • the common lower belt is driven, while the separate upper belts of the screen belt press and the high-pressure press are towed by the common lower belt.
  • Drive motors are thus saved.
  • Hiebei is expediently driven according to the invention, the common lower belt at two points by driven drainage drums.
  • a driven drum is provided at the discharge point from the belt press and the discharge point from the high pressure press.
  • Hiebei preferably has the high-pressure press dewatering drums, over which the common lower belt and the upper belt of the high-pressure press are guided alternately. In this way, the dragging of the upper belt in the area of the high-pressure press is facilitated by the driven common lower belt.
  • a washing device can also advantageously be provided, which is formed in particular by spray nozzles.
  • washing the filter cake or the comminuted material obtained from the filter cake has proven to be advantageous.
  • the invention is illustrated schematically in the drawing using exemplary embodiments.
  • FIG. 1 shows in side view the belt press and the downstream high-pressure press with intermediate comminution and distribution device for the sludge cake resulting from the belt press.
  • 2 and 3 show the intermediate comminution and distribution device on a larger scale, FIG. 2 being a vertical section along line II-II of FIG. 3 and FIG. 3 being a plan view in the direction of arrow III of FIG. 2.
  • 4 to 6 show another embodiment. 4 shows a section through the upstream screen belt press and the downstream high-pressure press, and FIGS. 5 and 6 show details on a larger scale.
  • Sludge is dewatered in the screen belt press 1 shown in FIG. 1.
  • the sewage sludge is placed at 2 on the sieve belt 3.
  • 4 is the sieving zone.
  • the sludge is applied from the sieve belt 3 to a second sieve belt 5 and guided between the two sieve belts 3 and 5 via dewatering drums 6.
  • the mud cakes are released from the sieve belt 3 by a scraper 8 and reach the feed hopper 9.
  • a tearing roller 10 is rotatably mounted about an axis 12 in the direction of arrow 11.
  • the ripping roller 10 has teeth 13 which engage between teeth 14 fixedly attached to the wall of the feed hopper 9.
  • a conveyor belt 15, which is moved in the direction of arrow 16, is arranged below the tearing roller 10.
  • a rotating distribution screw 17 is arranged above the conveyor belt 15, the screw flights 18 and 19 of which run right and left, so that this is done by the teeth 13 of the tearing roller 10 and the stationary Teeth 14 crushed material is distributed over the width of the conveyor belt 15.
  • 20 is a scraper plate which is arrow-shaped with arrow head 21 pointing in the opposite direction to the conveying direction.
  • the conveyor belt 15 simultaneously forms the one belt of the high-pressure press 22, which is supported against a rotating plate chain 23.
  • the second screen belt 24 of the high-pressure press 22 is supported against a rotating plate chain 25.
  • the material to be dewatered and shredded by the tearing roller 10 is located between the two sieve belts 15 and 27. This material is detached from the sieve belt 15 by a scraper 28 and dropped at 29.
  • the arrangement according to FIGS. 4 to 6 differs from the arrangement according to FIGS. 1 to 3 in that the sufficiency is found with three sieve belts.
  • 31 is the upstream belt press and 32 is the downstream high pressure press.
  • a common lower belt 33 is guided over the entire area of the belt filter press 31 and the high pressure press 32.
  • 34 is the upper belt of the belt press 31.
  • 35 is the upper belt of the high-pressure press 32.
  • the belt, which forms the lower belt 33 at the discharge point 36 of the belt press 31, is guided away from this discharge point to the feed point 37 of the high-pressure press 32.
  • 38 is a housing which is open at the top and corresponds to the feed hopper 9 according to FIG. 1 and in which a spiked roller 39 for comminuting the filter cake, a distribution screw 40 for distributing the comminuted material and a pressure roller 41 for determining the layer height of the comminuted material are arranged are.
  • the Spiked roller 39 interacts with teeth 42 which are arranged fixedly on the housing 38 and which engage between the spikes 43 of the spiked roller.
  • the material that has now been shifted between the common lower belt 33 and the upper belt 35 guided over the area of the high-pressure press 32 is further dewatered.
  • the common lower belt 33 and the upper belt guided over the area of the high-pressure press are alternately guided over drainage drums 44.
  • the common lower belt is driven.
  • the lower belt 33 is driven at two points, namely via a drum 45 arranged at the discharge point 36 of the upstream screen belt press 31 and via a drum 47 arranged at the discharge point 46 of the high-pressure press 32.
  • the drums 45 and 47 can also be drainage drums at the same time.
  • the upper belt 34 of the upstream screen belt press 31 is dragged by the common lower belt 33 and also the upper belt 35 of the high-pressure press is dragged by the common lower belt 33. Since the material to be dewatered is guided in the high-pressure press between the common lower belt 33 and the upper belt of the high-pressure press via the dewatering drums 44, it is easily possible for the upper belt 35 to be towed by the driven common lower belt 33 even in the high-pressure stage.
  • the housing 38 shows on a larger scale the housing 38 with the spiked roller 39, the distributing screw 40 and the pressure roller 41.
  • the housing 38 is open at the top and it is therefore possible to shred the additional 48 substances, such as lime, fillers, etc. Mix material.
  • FIG. 3 shows the housing 38 on a larger scale, in which 43 spray nozzles 49 are provided instead of the spiked roller for washing the filter cake with water. These spray nozzles 49 can also be provided in addition to the spiked roller 43, so that the crushed material is washed. In this case, the shredded material is slurried again.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Treatment Of Sludge (AREA)
  • Drying Of Solid Materials (AREA)
  • Filtration Of Liquid (AREA)

Abstract

In a method and apparatus for obtaining a high content of solid matter in the dewatering of sludges, especially sewage sludges, the sludge first being dewatered in a screen-band press (1, 31) and thereafter in a following high-pressure press (22, 32), the largely dewatered sludge cake coming out of the screen-band press (1, 31) is comminuted or broken up. The comminuted material is thereupon distributed and layered and is fed to the high-pressure press (22, 32). Because the material has been comminuted and relayered, a more thorough dewatering in the high-pressure press (22, 32) becomes possible. <IMAGE>

Description

Die Entwässerung von Schlämmen, insbesondere Schlämmen von Kläranlagen, erfolgt üblicherweise mittels Siebbandpressen, bei welchen der Schlamm zwischen Siebbändern über Entwässerungstrommeln geführt wird. Um den Gehalt des zu entwässernden Schlammes an Trockensubstanz zu erhöhen, ist es bekannt, an eine solche Siebbandpresse eine Hochdruckstufe bzw. eine Hochdruckpresse anzuschließen, wobei in der Hochdruckstufe die Entwässerung weiter verbessert wird. Auch beim Austritt aus der Hochdruckstufe ist bei solchen Entwässerungsanlagen der Trockengehalt des Schlammes noch nicht zufriedenstellend. Der getrocknete Schlamm kann beispielsweise zu Düngerzwecken verwendet werden. Auch wenn der getrocknete Schlamm auf eine Deponie gebracht wird, so ist hiefür ein ausreichender Trockengehalt des Schlammes erforderlich, da ein Schlamm mit zu großem Feuchtigkeitsgehalt sich nicht stapeln läßt, sondern abrutscht. Es wird allgemein ein Gehalt von wenigstens 35 % Trockensubstanz gefordert, um der Deponieforderung Rechnung zu tragen. Ein solcher Trockengehalt kann durch die Entwässerung des Schlammes allein nicht erreicht werden. Um den Deponieforderungen zu entsprechen, ist es meist erforderlich, eine Nachkalkanlage vorzusehen, in welcher dem getrockneten Schlamm zur Erhöhung des Gehaltes an Trockensubstanz Kalk zugeführt wird. Eine solche Nachkalkanlage erfordert in der Herstellung einen zusätzlichen Kostenaufwand und es entstehen weiters laufend Betriebskosten, da ja der Kalk vorher gebrannt und zerkleinert werden muß.Dewatering of sludge, in particular sludge from sewage treatment plants, is usually carried out by means of screen belt presses, in which the sludge is passed between screen belts via dewatering drums. In order to increase the dry matter content of the sludge to be dewatered, it is known to connect a high-pressure stage or a high-pressure press to such a belt filter press, the dewatering being further improved in the high-pressure stage. Even when leaving the high-pressure stage, the dryness of the sludge is not yet satisfactory in such drainage systems. The dried sludge can be used for fertilizer purposes, for example. Even if the dried sludge is brought to a landfill, a sufficient dryness of the sludge is required for this, since a sludge with too high a moisture content cannot be stacked but slips off. A content of at least 35% dry matter is generally required to meet the landfill requirement. Such a dry content cannot be achieved by dewatering the sludge alone. In order to meet the landfill requirements, it is usually necessary to provide a post-lime system in which lime is added to the dried sludge to increase the dry matter content. Such a post-lime plant requires an additional cost in production and there are also ongoing operating costs, since the lime has to be burnt and crushed beforehand.

Die Erfindung bezieht sich nun auf ein Verfahren zur Erzielung eines hohen Trockengehaltes bei der Entwässerung von Schlämmen, insbesondere Klärschlämmen, wobei der Schlamm zuerst in einer Siebbandpresse und hierauf in einer nachgeschalteten Hochdruckpresse entwässert wird, wobei der aus der Siebbandpresse austretende Schlammuchen zerkleinert wird und das zerkleinerte Material verteilt, geschichtet und der Hochdruckpresse zugeführt wird und auf eine Einrichtung zur Durchführung eines solchen Verfahrens.The invention now relates to a method for achieving a high dry content in the dewatering of sludge, in particular sewage sludge, the sludge being dewatered first in a belt press and then in a downstream high-pressure press, the sludge emerging from the belt press being crushed and the crushed material is distributed, layered and fed to the high-pressure press and onto a device for carrying out such a method.

Aus der DE-A-2 251 211 ist es bekannt geworder, den aus der Siebbandpresse austretenden Schlamm zu zerkleinern. Hier wird aber der zerkleinerte Schlamm nicht einer Hochdruckpresse zugeführt, sondern thermisch zu einem gekörnten rieselfähigen Produkt getrocknet und anschließend verbrannt. Wenn der aus der Siebbandpresse austretende Schlammkuchen der Hochdruckpresse unmittelbar zugeführt wird, ist der Entwässerungseffekt in der Hochdruckpresse nicht ausreichend, weil beim Weiterverpressen des Schlammkuchens ein Wasserstau im Kuchen entsteht. Es ist auf diese Weise ein Gehalt von 35 % Trockensubstanz nicht erreichbar.From DE-A-2 251 211 it has become known to shred the sludge emerging from the belt press. Here, however, the shredded sludge is not fed to a high-pressure press, but is thermally dried to a granular, free-flowing product and then burned. If the sludge cake emerging from the belt filter press is fed directly to the high-pressure press, the dewatering effect in the high-pressure press is not sufficient, because a water build-up occurs in the cake when the sludge cake is pressed further. A content of 35% dry matter cannot be achieved in this way.

Aus der DE-C-28 85 21 ist bereits eine Vorrichtung zum Abpressen der flüssigen Bestandteile aus Rohtorf und anderen schlammigen Massen u.dgl., bei der das zwischen zwei Förderbahnen eingebettete Preßgut mittels der Förderbahnen unter zwischenzeitlicher Aufhebung des Preßdruckes nacheinander Preßvorrichtungen, die einen stufenweise wachsenden Druck auf das Preßgut ausüben, zugeführt wird, bekanntgeworden. Zwischen den einzelnen Preßvorrichtungen wird das Preßgut mit Zerreißwalzen zerrissen, um einen homogeneren Feuchtigkeitsgehalt des Preßgutes zu erreichen.From DE-C-28 85 21 there is already a device for pressing out the liquid constituents from raw peat and other muddy masses and the like, in which the pressed material embedded between two conveyor tracks is successively pressed by means of the conveyor tracks, with the pressing pressure being lifted in the meantime, the one gradually increasing pressure on the material to be pressed, is supplied, has become known. Between the individual pressing devices, the material to be pressed is torn with shredding rollers in order to achieve a more homogeneous moisture content of the material to be pressed.

Aufgabe der Erfindung ist die Erhöhung des Gehaltes des entwässerten Schlammes an Trockensubstanz, bei gleichzeitiger Erzeugung eines hochwertigen Volldüngers. Zur Lösung dieser Aufgabe besteht das erfindungsgemäße Verfahren im wesentlichen darin, daß zur Erzeugung von Dünger dem zerkleinerten Material den Dünger aufwertende Stoffe, wie z.B. Stickstoff, Phosphor und/oder Kalium, zugegeben werden. Dadurch, daß den Dünger aufwertende Stoffe, wie z.B. Stickstoff, Phosphor und/oder Kalium, dem zerkleinerten Material zugesetzt werden, ist es möglich, einen hochwertigen Volldünger zu erzeugen. Da der aus der Siebbandpresse austretende Schlammkuchen zerkleinert wird und das zerkleinerte Material verteilt und umgeschichtet wird, bevor es der Hochdruckpresse zugeführt wird, scheinen die den Dünger aufwertenden Stoffe im getrockneten Schlamm gut verteilt auf. Es wird gleichzeitig ein Wasserstau vermieden und im Endeffekt ergibt sich eine Vergrößerung des Trockengehaltes des Schlammes an Trockensubstanz, ohne daß es erforderlich ist, eine Nachkalkanlage vorzusehen. Es kann ohne weiteres ein Gehalt an Trockensubstanz des Schlammes von 35 % und auch darüber erreicht werden, so daß der entwässerte Schlamm als Dünger verwendbar wird und es könner die Betriebskosten einer Nachkalkanlage vermieden werden.The object of the invention is to increase the dry matter content of the dewatered sludge while at the same time producing a high-quality complete fertilizer. To achieve this object, the method according to the invention essentially consists in adding substances that enhance the fertilizer, such as nitrogen, phosphorus and / or potassium, to the comminuted material in order to produce fertilizer. By adding substances that enhance the fertilizer, such as nitrogen, phosphorus and / or potassium, to the shredded material, it is possible to produce a high quality complete fertilizer. Since the sludge cake emerging from the belt filter press is crushed and the crushed material is distributed and rearranged before it is fed to the high-pressure press, the substances that enhance the fertilizer appear well distributed in the dried sludge. At the same time, water congestion is avoided and, in the end, there is an increase in the dry matter content of the sludge in dry matter, without it being necessary to provide a post-lime system. A dry matter content of the sludge of 35% and above can easily be achieved, so that the dewatered sludge can be used as fertilizer and the operating costs of a post-lime system can be avoided.

Bei einer Einrichtung zur Durchführung des erfindungsgemäßen Verfahrens ist gemäß der Erfindung unterhalb der Zerreißwalze ein zum Eingang der Hochdruckpresse führendes, ungefähr horizontales Förderband angeordnet, über welchem in Förderrichtung hinter der Zereißwalze eine Verteilschnecke angeordnet ist, deren Achse ungefähr parallel zur Achse der Zerreißwalze liegt. Durch diese Verteilschnecke, welche vorzugsweise rechts- und linksgängige Schneckengänge aufweist, wird das zerkleinerte Material über die Breite des Förderbandes verteilt und dabei umgeschichtet. Der Schlammkuchen weist in seinem Inneren einen größeren Feuchtigkeitsgehalt auf als an seiner Oberfläche, da ja in der vorgeschalteten Siebbandpresse die Oberfläche des Schlammkuchens am wirksamsten entwässert wurde. Durch die Umschichtung werden nun die einen größeren Feuchtigkeitsgehalt aufweisenden Teilchen mit den einen geringeren Feuchtigkeitsgehalt aufweisenden Teilchen vermischt. Es gelangen Teilchen, welche einen größeren Feuchtigkeitsgehalt aufweisen, in der Hochdruckpresse nach außen und es wird daher die Entwässerung in der Hochdruckpresse einerseits durch die Zerreißung der Struktur des Schlammkuchens vor der Hochdruckpresse und anderseits durch die Umschichtung verbessert. An der Austrittsstelle der Siebbandpresse ist ein Aufgabetrichter für die Schlammkuchen und eine rotierende Zerreißwalze angeordnet. Der Aufgabetrichter führt die Schlammkuchen der Zerreißwalze zu, welche die Zerkleinerung bewirkt.In a device for performing the method according to the invention, an approximately horizontal conveyor belt leading to the entrance of the high-pressure press is arranged below the shredding roller, above which a distribution screw is arranged in the conveying direction behind the shredding roller, the axis of which is approximately parallel to the axis of the shredding roller. The shredded material is distributed over the width of the conveyor belt and thereby shifted through this distribution screw, which preferably has right-handed and left-handed screw flights. The inside of the mud cake has a greater moisture content than on its surface, since the surface of the mud cake was most effectively dewatered in the upstream sieve belt press. The layering now mixes the particles with a greater moisture content with the particles with a lower moisture content. Particles which have a greater moisture content reach the outside in the high-pressure press and the dewatering in the high-pressure press is therefore improved, on the one hand, by tearing the structure of the sludge cake in front of the high-pressure press, and on the other hand, by the layering. At the exit point the feed belt press has a feed hopper for the sludge cake and a rotating shredding roller. The feed hopper feeds the sludge cake to the shredding roller, which causes the shredding.

Gemäß der Erfindung ist vorzugsweise die Zerreißwalze mit Zähnen ausgestattet, die zwischen ortsfesten Zähnen an einer mit dem Aufgabetrichter verbundenen Wandung eingreifen. Der Schlammkuchen enthält meist faserige Anteile und diese werden durch die ineinandergreifenden Zähne wirksam zerrissen.According to the invention, the tear roller is preferably equipped with teeth which engage between fixed teeth on a wall connected to the feed hopper. The mud cake usually contains fibrous parts and these are effectively torn apart by the interlocking teeth.

Gemäß der Erfindung ist zweckmäßig in Förderrichtung hinter der Verteilschnecke ein höhenverstellbarer Abstreifer angeordnet, so daß die Schichthöhe einerseits vergleichmäßigt werden kann und anderseits der Menge der anfallenden Schlammkuchen und der Höhe des Einlaufschlitzes der Hochdruckpresse angepaßt werden kann. Zweckmäßig ist gemäß der Erfindung der Abstreifer im Grudriß pfeilförmig mit entgegen der Förderrichtung weisender Pfeilspitze ausgebildet, wodurch der Verteileffekt verbessert wird. Gemäß der Erfindung kann auch eine die Schichthöhe begrenzende Druckwalze vorgesehen sein.According to the invention, a height-adjustable scraper is expediently arranged in the conveying direction behind the distribution screw, so that the layer height can be made more uniform on the one hand and on the other hand the amount of sludge cake and the height of the inlet slot of the high-pressure press can be adjusted. According to the invention, the scraper is expediently shaped in the shape of an arrow with an arrowhead pointing in the opposite direction to the conveying direction, which improves the distribution effect. According to the invention, a pressure roller which limits the layer height can also be provided.

Wenn die Hochdruckpresse gesondert von der Siebbandpresse ausgebildet ist, sind vier Siebbänder erforderlich, nämlich das Unterband und das Oberband der Siebbandpresse und das Unterband und das Oberband der Hochdruckpresse. Diese vier Siebbänder stellen einen gewissen Aufwand dar und es sind überdies auch für diese Siebbänder gesonderte Antriebseinrichtungen erforderlich. Gemäß einer bevorzugten Ausführungsform der Erfindung kann aber auch die Anordnung so getroffen sein, daß ein Siebband, u.zw. das aus der Siebbandpresse als Unterband austretende Siebband, über die gesamte Siebbandpresse und über die nachgeschaltete Hochdruckpresse geführt ist, daß im Bereich der Siebbandpresse und der nachgeschalteten Hochdruckpresse gesonderte Oberbänder vorgesehen sind und daß an der Austragsstelle zwischen dem gemeinsamen Unterband und dem Oberband der vorgeschalteten Siebbandpresse der Filterkuchen auf das Unterband an einer Stelle vor dem Eintritt desselben in die Hochdruckpresse aufgebracht wird, wobei hinter der Austragsstelle zwischen dem gemeinsamen Unterband und dem Oberband der Siebbandpresse und der Aufbringungsstelle auf das gemeinsame Unterband die Vorrichtungen zur Zerkleinerung des Filterkuchens und die Verteilung und Schichtung des Materials angeordnet sind. Dadurch, daß für die vorgeschaltete Siebbandpresse und die nachgeschaltete Hochdruckpresse ein gemeinsames Unterband vorgesehen ist, welches über den Bereich der Siebbandpresse und der Bereich der Hochdruckpresse geführt ist, wobei nur die Oberbänder in der Siebbandpresse und in der Hochdruckpresse gesondert ausgebildet sind, wird mit drei Siebbändern das Auslangen gefunden und es wird somit ein Siebband eingespart.If the high-pressure press is designed separately from the wire belt press, four wire belts are required, namely the lower belt and the upper belt of the wire belt press and the lower belt and the upper belt of the high pressure press. These four sieve belts represent a certain outlay and separate drive devices are also required for these sieve belts. According to a preferred embodiment of the invention, however, the arrangement can also be such that a sieve belt, etc. the sieve belt emerging from the wire belt press as the lower belt is guided over the entire belt press and the downstream high pressure press, that separate upper belts are provided in the area of the belt press and the downstream high pressure press and that at the discharge point between the common Lower belt and the upper belt of the upstream sieve belt press the filter cake is applied to the lower belt at a point before it enters the high-pressure press, with the devices for comminuting the. Behind the discharge point between the common lower belt and the upper belt of the sieve belt press and the application point on the common lower belt Filter cake and the distribution and layering of the material are arranged. The fact that a common lower belt is provided for the upstream belt press and the downstream high-pressure press, which is guided over the area of the belt press and the area of the high-pressure press, with only the upper belts in the belt press and in the high-pressure press being designed separately, with three wire belts suffice and a sieve belt is saved.

Auch der Antrieb von Siebbandpresse und Hochdruckpresse wird in diesem Falle vereinfacht. Gemäß der Erfindung ist vorzugsweise lediglich das gemeinsame Unterband angetrieben, während die gesonderten Oberbänder der Siebbandpresse und der Hochdruckpresse vom gemeinsamen Unterband geschleppt sind. Es werden somit Antriebsmotoren eingespart. Hiebei ist zweckmäßig gemäß der Erfindung das gemeinsame Unterband an zwei Stellen durch angetriebene Entwässerungstrommeln angetrieben. An der Austragsstelle aus der Siebbandpresse und der Austragsstelle aus der Hochdruckpresse ist je eine angetriebene Trommel vorgesehen. Es erfolgt somit ein wirksamer und einfacher Antrieb des Unterbandes, wodurch das Mitschleppen des jeweiligen Oberbandes erleichtert wird. Hiebei weist gemäß der Erfindung vorzugsweise die Hochdruckpresse Entwässerungstrommeln auf, über welche das gemeinsame Unterband und das Oberband der Hochdruckpresse wechselweise geführt ist. Auf diese Weise wird im Bereich der Hochdruckpresse das Mitschleppen des Oberbandes durch das angetriebene gemeinsame Unterband erleichtert.The drive of the belt press and high pressure press is also simplified in this case. According to the invention, preferably only the common lower belt is driven, while the separate upper belts of the screen belt press and the high-pressure press are towed by the common lower belt. Drive motors are thus saved. Hiebei is expediently driven according to the invention, the common lower belt at two points by driven drainage drums. A driven drum is provided at the discharge point from the belt press and the discharge point from the high pressure press. There is thus an effective and simple drive of the lower belt, which facilitates the dragging of the respective upper belt. According to the invention, Hiebei preferably has the high-pressure press dewatering drums, over which the common lower belt and the upper belt of the high-pressure press are guided alternately. In this way, the dragging of the upper belt in the area of the high-pressure press is facilitated by the driven common lower belt.

Gemäß der Erfindung kann auch in vorteilhafter Weise eine Waschvorrichtung vorgesehen sein, welche insbesondere von Sprühdüsen gebildet ist. In vielen Fällen hat sich eine Waschung des Filterkuchens oder des zerkleinerten aus dem Filterkuchen gewonnenen Materials als vorteilhaft erwiesen.According to the invention, a washing device can also advantageously be provided, which is formed in particular by spray nozzles. In many cases, washing the filter cake or the comminuted material obtained from the filter cake has proven to be advantageous.

In der Zeichnung ist die Erfindung anhand von Ausführungsbeispielen schematisch veranschaulicht.The invention is illustrated schematically in the drawing using exemplary embodiments.

Fig. 1 zeigt im Seitenriß die Siebbandpresse und die nachgeschaltete Hochdruckpresse mit zwischengeschalteter Zerkleinerungs- und Verteileinrichtung für die aus der Siebbandpresse anfallenden Schlammkuchen. Fig. 2 und 3 zeigen im größeren Maßstab die zwischengeschaltete Zerkleinerungs- und Verteileinrichtung, wobei Fig. 2 einen Vertikalschnitt nach Linie II - II der Fig. 3 und Fig. 3 eine Draufsicht in Richtung des Pfeiles III der Fig. 2 darstellt. Fig. 4 bis 6 zeigen eine andere Ausführungsform. Hiebei zeigen Fig. 4 einen Schnitt durch die vorgeschaltete Siebbandpresse und die nachgeschaltete Hochdruckpresse und Fig. 5 und 6 Details in größerem Maßstab.Fig. 1 shows in side view the belt press and the downstream high-pressure press with intermediate comminution and distribution device for the sludge cake resulting from the belt press. 2 and 3 show the intermediate comminution and distribution device on a larger scale, FIG. 2 being a vertical section along line II-II of FIG. 3 and FIG. 3 being a plan view in the direction of arrow III of FIG. 2. 4 to 6 show another embodiment. 4 shows a section through the upstream screen belt press and the downstream high-pressure press, and FIGS. 5 and 6 show details on a larger scale.

In der in Fig. 1 dargestellten Siebbandpresse 1 wird Schlamm entwässert. Die Aufgabe des Klärschlammes erfolgt bei 2 auf das Siebband 3. 4 ist die Seihzone. Vom Siebband 3 wird der Schlamm auf ein zweites Siebband 5 aufgebracht und zwischen den beiden Siebbändern 3 und 5 über Entwässerungstrommeln 6 geführt. An der Stelle 7 werden die Schlammkuchen durch einen Schaber 8 vom Siebband 3 gelöst und gelangen in den Aufgabetrichter 9.Sludge is dewatered in the screen belt press 1 shown in FIG. 1. The sewage sludge is placed at 2 on the sieve belt 3. 4 is the sieving zone. The sludge is applied from the sieve belt 3 to a second sieve belt 5 and guided between the two sieve belts 3 and 5 via dewatering drums 6. At point 7, the mud cakes are released from the sieve belt 3 by a scraper 8 and reach the feed hopper 9.

Im unteren teil des Aufgabetrichters 9 ist eine Zerreißwalze 10 im Sinne des Pfeiles 11 um eine Achse 12 rotierbar gelagert. Die Zerreißwalze 10 weist Zähne 13 auf, welche zwischen ortsfest an der Wandung des Aufgabetrichters 9 angebrachten Zähnen 14 eingreifen. Unterhalb der Zerreißwalze 10 ist ein Förderband 15 angeordnet, welches in Richtung des Pfeiles 16 bewegt wird. In Förderrichtung 16 hinter der Zerreißwalze 10 ist oberhalb des Förderbandes 15 eine rotierende Verteilschnecke 17 angeordnet, deren Schneckengänge 18 und 19 rechts- und linksgängig verlaufen, so daß das durch die Zähne 13 der Zerreißwalze 10 und die ortsfesten Zähne 14 zerkleinerte Material über die Breite des Förderbandes 15 verteilt wird. 20 ist ein Abstreifblech welches pfeilförmig mit entgegen der Förderrichtung weisender Pfeilspitze 21 ausgebildet ist.In the lower part of the hopper 9, a tearing roller 10 is rotatably mounted about an axis 12 in the direction of arrow 11. The ripping roller 10 has teeth 13 which engage between teeth 14 fixedly attached to the wall of the feed hopper 9. A conveyor belt 15, which is moved in the direction of arrow 16, is arranged below the tearing roller 10. In the conveying direction 16 behind the tearing roller 10, a rotating distribution screw 17 is arranged above the conveyor belt 15, the screw flights 18 and 19 of which run right and left, so that this is done by the teeth 13 of the tearing roller 10 and the stationary Teeth 14 crushed material is distributed over the width of the conveyor belt 15. 20 is a scraper plate which is arrow-shaped with arrow head 21 pointing in the opposite direction to the conveying direction.

Das Förderband 15 bildet gleichzeitig das eine Siebband der Hochdruckpresse 22, welches gegen eine umlaufende Plattenkette 23 abgestützt ist. Das zweite Siebband 24 der Hochdruckpresse 22 ist gegen eine umlaufende Plattenkette 25 abgestützt. Zwischen den beiden Siebbändern 15 und 27 befindet sich das zu entwässernde, durch die Zerreißwalze 10 zerkleinerte Material. Dieses Material wird durch einen Schaber 28 vom Siebband 15 abgelöst und bei 29 abgeworfen.The conveyor belt 15 simultaneously forms the one belt of the high-pressure press 22, which is supported against a rotating plate chain 23. The second screen belt 24 of the high-pressure press 22 is supported against a rotating plate chain 25. The material to be dewatered and shredded by the tearing roller 10 is located between the two sieve belts 15 and 27. This material is detached from the sieve belt 15 by a scraper 28 and dropped at 29.

Die Anordnung nach Fig. 4 bis 6 unterscheidet sich von der Anordnung nach Fig. 1 bis 3 dadurch, daß mit drei Siebbändern das Auslangen gefunden wird. Hier ist 31 die vorgeschaltete Siebbandpresse und 32 ist die nachgeschaltete Hochdruckpresse. Ein gemeinsames Unterband 33 ist über den gesamten Bereich der Siebbandpresse 31 und der Hochdruckpresse 32 geführt. 34 ist das Oberband der Siebbandpresse 31. 35 ist das Oberband der Hochdruckpresse 32. Das Siebband, welches an der Austragsstelle 36 der Siebbandpresse 31 das Unterband 33 bildet, ist von dieser Austragsstelle weg zur Aufgabestelle 37 der Hochdruckpresse 32 geführt. Zwischen der Austragsstelle 36 der Siebbandpresse 31 und der Aufgabestelle 37 der Hochdruckpresse 32 liegt somit das Unterband 33 frei und es kann daher der Filterkuchen von der Austragsstelle 36 der Siebbandpresse 31 auf das Unterband 33 vor der Aufgabestelle 37 der Hochdruckpresse 32 aufgeworfen werden. 38 ist ein oben offenes Gehäuse, welches dem Aufgabetrichter 9 nach Fig. 1 entspricht und in welchem eine Stachelwalze 39 für die Zerkleinerung des Filterkuchens, eine Verteilschnecke 40 für die Verteilung des zerkleinerten Materials und eine Druckwalze 41 für die Bestimmung der Schichthöhe des zerkleinerten Materials angeordnet sind. Die Stachelwalze 39 wirkt mit ortsfest am Gehäuse 38 angeordneten Zähnen 42 zusammen, welche zwischen den Stacheln 43 der Stachelwalze eingreifen. In der Hochdruckpresse wird das nunmehr umgeschichtete Material zwischen dem gemeinsamen Unterband 33 und dem über den Bereich der Hochdruckpresse 32 geführten Oberband 35 weiter entwässert. In der Hochdruckpresse 32 ist das gemeinsame Unterband 33 und das über den Bereich der Hochdruckpresse geführte Oberband wechselweise über Entwässerungstrommeln 44 geführt. Das geneinsame Unterband ist angetrieben. Der Antrieb des Unterbandes 33 erfolgt an zwei Stellen, und zwar über eine an der Austragsstelle 36 der vorgeschalteten Siebbandpresse 31 angeordnete Trommel 45 und über eine an der Austragsstelle 46 der Hochdruckpresse 32 angeordnete Trommel 47. Die Trommeln 45 und 47 können gleichzeitig auch Entwässerungstrommeln sein. Das Oberband 34 der vorgeschalteten Siebbandpresse 31 wird vom gemeinsamen Unterband 33 geschleppt und auch das Oberband 35 der Hochdruckpresse wird vom gemeinsamen Unterband 33 geschleppt. Da in der Hochdruckpresse das nachzuentwässernde Gut zwischen dem gemeinsamen Unterband 33 und dem Oberband der Hochdruckpresse über die Entwässerungstrommeln 44 geführt wird, ist es ohne weiteres möglich, daß auch in der Hochdruckstufe das Oberband 35 durch das angetriebene gemeinsame Unterband 33 geschleppt wird.The arrangement according to FIGS. 4 to 6 differs from the arrangement according to FIGS. 1 to 3 in that the sufficiency is found with three sieve belts. Here 31 is the upstream belt press and 32 is the downstream high pressure press. A common lower belt 33 is guided over the entire area of the belt filter press 31 and the high pressure press 32. 34 is the upper belt of the belt press 31. 35 is the upper belt of the high-pressure press 32. The belt, which forms the lower belt 33 at the discharge point 36 of the belt press 31, is guided away from this discharge point to the feed point 37 of the high-pressure press 32. Between the discharge point 36 of the belt press 31 and the feed point 37 of the high-pressure press 32, the lower belt 33 is thus exposed and the filter cake can therefore be thrown from the discharge point 36 of the belt press 31 onto the lower belt 33 in front of the feed point 37 of the high-pressure press 32. 38 is a housing which is open at the top and corresponds to the feed hopper 9 according to FIG. 1 and in which a spiked roller 39 for comminuting the filter cake, a distribution screw 40 for distributing the comminuted material and a pressure roller 41 for determining the layer height of the comminuted material are arranged are. The Spiked roller 39 interacts with teeth 42 which are arranged fixedly on the housing 38 and which engage between the spikes 43 of the spiked roller. In the high-pressure press, the material that has now been shifted between the common lower belt 33 and the upper belt 35 guided over the area of the high-pressure press 32 is further dewatered. In the high-pressure press 32, the common lower belt 33 and the upper belt guided over the area of the high-pressure press are alternately guided over drainage drums 44. The common lower belt is driven. The lower belt 33 is driven at two points, namely via a drum 45 arranged at the discharge point 36 of the upstream screen belt press 31 and via a drum 47 arranged at the discharge point 46 of the high-pressure press 32. The drums 45 and 47 can also be drainage drums at the same time. The upper belt 34 of the upstream screen belt press 31 is dragged by the common lower belt 33 and also the upper belt 35 of the high-pressure press is dragged by the common lower belt 33. Since the material to be dewatered is guided in the high-pressure press between the common lower belt 33 and the upper belt of the high-pressure press via the dewatering drums 44, it is easily possible for the upper belt 35 to be towed by the driven common lower belt 33 even in the high-pressure stage.

Fig. 2 zeigt im größeren Maßstab das Gehäuse 38 mit der Stachelwalze 39, der Verteilschnecke 40 und der Druckwalze 41. Das Gehäuse 38 ist oben offen und es ist daher möglich, bei 48 zusätzliche Stoffe, wie beispielsweise Kalk, Füllstoffe, usf. dem zerkleinerten Material zuzumischen.2 shows on a larger scale the housing 38 with the spiked roller 39, the distributing screw 40 and the pressure roller 41. The housing 38 is open at the top and it is therefore possible to shred the additional 48 substances, such as lime, fillers, etc. Mix material.

Fig. 3 zeigt im größeren Maßstab wieder das Gehäuse 38, in welchem anstelle der Stachelwalze 43 Sprühdüsen 49 für die Waschung der Filterkuchen mit Wasser vorgesehen sind. Diese Sprühdüsen 49 können aber auch zusätzlich zu der Stachelwalze 43 vorgesehen sein, so daß das zerkleinerte Material gewaschen wird. In diesem Falle erfolgt eine nochmalige Aufschlämmung des zerkleinerten Materials.3 shows the housing 38 on a larger scale, in which 43 spray nozzles 49 are provided instead of the spiked roller for washing the filter cake with water. These spray nozzles 49 can also be provided in addition to the spiked roller 43, so that the crushed material is washed. In this case, the shredded material is slurried again.

Claims (13)

1. A method of attaining a high dry content in the drainage of sludges, in particular sewage sludges, the sludge first being drained in a sieve belt press (1, 31) and then in a high-pressure press (22, 32) connected thereafter, the sludge cake which leaves the sieve belt press (1, 31) being crushed and the crushed material being distributed, arranged in layers and fed to the high-pressure press (22, 32), characterised in that, for the production of manure, manure-enriching substances, such as nitrogen, phosphorus and/or potassium for example, are added to the crushed material.
2. A device for carrying out the method according to Claim 1, in which a charging hopper (9, 38) for the sludge cakes and a rotating breaking-roller (10, 39) are arranged at the delivery point (7, 36) of the sieve belt press (1, 31), characterised in that an approximately horizontal conveyor belt (15, 33), leading to the inlet of the high-pressure press (22, 37), is arranged beneath the breaking roller (10, 39), above which conveyor belt a distributing worm (17, 40) is arranged behind the breaking roller (10, 39) in the conveying direction (16), the axis of which distributing worm (17, 40) lies approximately parallel to the axis (12) of the breaking roller (10, 39).
3. A device according to Claim 2, characterised in that the breaking roller (10, 39) is equipped with teeth (13, 49) which engage between stationary teeth (14, 42) arranged on a wall which is connected to the charging hopper (9, 38).
4. A device according to Claim 3, characterised in that the distributing worm (17, 40) has right-hand and left-hand threads (18, 19).
5. A device according to any one of Claims 2, 3 or 4, characterised in that a vertically adjustable stripper (20) is arranged behind the distributing worm (17) in the conveying direction (16).
6. A device according to Claim 5, characterised in that the stripper (20) is formed so as to be arrow-shaped in cross section, with the arrowhead pointing against the conveying direction (16).
7. A device according to any one of Claims 2 to 6, characterised in that a sieve belt, namely the sieve belt leaving the sieve belt press as lower belt (33), is guided over the entire sieve belt press (31) and over the high-pressure press (32) connected thereafter, in that separate upper belts (34, 35) are provided in the region of the sieve belt press (31) and the high-pressure press (32) connected thereafter, and in that, at the delivery point (36) between the common lower belt (33) and the upper belt (34) of the sieve belt press connected therebefore, the filter cake is applied onto the lower belt (33) at a point before the entry of the same into the high-pressure press (32), the devices (10, 39, 17, 40, 20, 41) for crushing the filter cake and distributing and arranging the material in layers being arranged behind the delivery point (36) between the common lower belt (33) and the upper belt (34) of the sieve belt press (31) and the point of application onto the common lower belt (33) (Fig. 4).
8. A device according to Claim 7, characterised in that only the common lower belt (33) is driven and the separate upper belts (34, 35) of the sieve belt press (31) and of the high-pressure press (32) are pulled along by the common lower belt (33).
9. A device according to Claim 7 or 8, characterised in that the common lower belt (33) is driven at two points by driven drainage drums (45, 47).
10. A device according to Claim 7, 8 or 9, characterized in that a driven drum (45, 47) is provided in each case at the delivery point (36) from the sieve belt press (31) and at the delivery point (46) from the high-pressure press (32).
11. A device according to any one of Claims 7 to 10, characterised in that the high-pressure press (32) has drainage drums (44), over which the common lower belt (33) and the upper belt (35) of the high-pressure press (32) is guided alternately.
12. A device according to any one of Claims 2 to 11, characterised in that a washing device, formed in particular from spray nozzles (49), is arranged between the delivery point (7, 36) of the sieve belt press (1, 31) and the feed point (37) to the high-pressure press.
13. A device according to any one of Claims 2 to 12, characterised in that a pressure roller (41), determining the layer height of the crushed material, is provided behind the distributing worm (40) in the conveying direction (16).
EP86890058A 1985-03-15 1986-03-12 Method and apparatus for obtaining a high content of solid matter in the dewatering of sludges Expired - Lifetime EP0194996B1 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AT0078785A AT390785B (en) 1985-03-15 1985-03-15 METHOD AND DEVICE FOR OBTAINING A HIGH DRY CONTENT IN THE DRAINAGE OF SLUDGE
AT787/85 1985-03-15

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EP0194996A2 EP0194996A2 (en) 1986-09-17
EP0194996A3 EP0194996A3 (en) 1987-11-25
EP0194996B1 true EP0194996B1 (en) 1991-07-31

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DE (1) DE3680558D1 (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5386768A (en) * 1993-03-26 1995-02-07 Roediger Pittsburgh, Inc. Apparatus for dewatering sludge
CN113896397A (en) * 2021-05-19 2022-01-07 重庆三峡环保（集团）有限公司 High-pressure belt type sludge deep dehydration system
CN113716831A (en) * 2021-09-07 2021-11-30 广东华坤建设集团有限公司 Sludge dewatering and fixing treatment system

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE288521C (en) *
DE253752C (en) * 1910-11-19
DE406943C (en) * 1922-04-25 1924-12-09 Julius Weinmann Fruit and grape press with endless belts
DE385631C (en) * 1922-08-26 1923-11-26 A W Mackensen Maschinenfabrik Schnitzel press
NL121616C (en) * 1960-02-20
DE2149052A1 (en) * 1971-10-01 1973-04-05 Flessner Kg HORIZONTAL BELT PRESS FOR DRAINING SOLIDS
DE2251211A1 (en) * 1972-10-19 1974-05-02 Klein Alb Kg Sewage sludge drier-processor - using partial incineration to provide drying heat for bulk
CH610579A5 (en) * 1975-04-11 1979-04-30 Indberatungs Ag Process and apparatus for the dewatering of sludge
FR2327862A1 (en) * 1975-10-13 1977-05-13 Besnard Rene MACHINE FOR EXPRESSING SLUDGE OR PULP LIQUIDS
AT359933B (en) * 1979-01-04 1980-12-10 Voest Alpine Ag DEVICE FOR DRAINING WATER-BASED SUBSTANCES
CH656635A5 (en) * 1981-11-13 1986-07-15 Bell Ag Maschf DEVICE FOR DEWATERING DAMP, TEILCHENMAESSIG heterogeneous GOOD, ESPECIALLY STUECKTORF.
AT387379B (en) * 1982-03-01 1989-01-10 Andritz Ag Maschf DEVICE FOR HUMIDIFYING THE FILTER CAKE ON DRAINAGE MACHINES
AT380865B (en) * 1982-08-13 1986-07-25 Voest Alpine Ag DEVICE FOR DRAINING WATER-BASED SUBSTANCES

Also Published As

Publication number Publication date
EP0194996A2 (en) 1986-09-17
DE3680558D1 (en) 1991-09-05
ATA78785A (en) 1989-12-15
EP0194996A3 (en) 1987-11-25
ATE65740T1 (en) 1991-08-15
AT390785B (en) 1990-06-25

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