EP0480176A1 - Process for dehydrating aqueous sludges by means of pressure - Google Patents

Process for dehydrating aqueous sludges by means of pressure Download PDF

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Publication number
EP0480176A1
EP0480176A1 EP91115039A EP91115039A EP0480176A1 EP 0480176 A1 EP0480176 A1 EP 0480176A1 EP 91115039 A EP91115039 A EP 91115039A EP 91115039 A EP91115039 A EP 91115039A EP 0480176 A1 EP0480176 A1 EP 0480176A1
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EP
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Prior art keywords
piston
sludge
pressure
chamber
filter
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Granted
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EP91115039A
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German (de)
French (fr)
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EP0480176B1 (en
Inventor
Wolfgang Dipl.-Ing. Müller
Dirk Dipl.-Ing. Herzog
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Mueller Umwelttechnik & Co KG GmbH
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Mueller Umwelttechnik & Co KG GmbH
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F26—DRYING
    • F26B—DRYING SOLID MATERIALS OR OBJECTS BY REMOVING LIQUID THEREFROM
    • F26B5/00—Drying solid materials or objects by processes not involving the application of heat
    • F26B5/14—Drying solid materials or objects by processes not involving the application of heat by applying pressure, e.g. wringing; by brushing; by wiping
    • 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
    • B30B9/04—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 press rams
    • B30B9/06—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 press rams co-operating with permeable casings or strainers

Definitions

  • the invention relates to a method according to the type mentioned in the preamble of the main claim.
  • the receiving chamber for the sludge has a closable cover on one end face, which can be opened for pushing out the filter cake, and in the fresh raw sludge on the opposite end face of the receiving chamber is fed.
  • a disadvantage of this method is that it runs discontinuously and no further dewatering takes place on the extension side during the extension stroke. and on the other hand that the freshly supplied raw sludge must pass through already dewatered filter cake, or part of it, and push the plunger in front of it, whereby the sludge always gets onto filter surfaces that have already been used, which leads to problematic sludge that can clog the filter openings that the process has to be stopped and the entire batch has to be pumped back.
  • the present invention has for its object to provide a method in which the sludge is dewatered during each piston stroke without having to reduce the working pressure of the sludge pump and in which the freshly supplied raw sludge is constantly provided with a clean filter surface.
  • a particular advantage of this process is that the fresh raw sludge can be fed directly behind the moving piston, whereby the piston frees the coated filter surfaces of the filter cartridges from adhering sludge deposits that close the very small filter openings, so that the pumped-in sludge always has a clean filter surface is available.
  • the double-acting piston offers the advantage of realizing this type of sludge feed in both directions of movement of the piston, which means that the process can be carried out virtually continuously and there is sludge dewatering in both chambers in every operating state.
  • the homogeneity of the sludge cake is also advantageous, since the process is designed in such a way that the sludge layers building up behind the piston are discharged again in approximately the same chronological order of their formation, and a sludge cake with the same moisture distribution is thus produced.
  • FIG. 1 A drawing of an exemplary embodiment of a device for carrying out the method, FIG. 1.
  • the receiving chamber 25 for example into chamber I, with raw sludge mixed with flocculant via the pump 5 through the opened valve 1, the sludge feed line 7 and the telescopic pipe 29 pumped in.
  • the piston 8 is pushed up to a mechanical stop in the direction of the empty chamber 11, which is constantly reduced. Once he has reached this, raw sludge continues to be added until the desired operating pressure is reached.
  • the resulting filtrate 30 flows through the filter candles 12 into the collecting containers 13, 14 arranged in the container lids 17, 18 and is then discharged via the outlets 15, 16.
  • valve 1 closes and valve 2 opens, so that the fresh one Raw sludge 21 passes through the valve 2, the sludge feed line 9 and the telescopic tube 28 into the chamber 11 until operating pressure is also reached there.
  • the pressure in the chamber I not loaded with raw sludge is now generated by the piston 8 and is maintained by the fact that the discharge opening 11 provided with the discharge nozzle 27 is closed by a valve 3.
  • valve 3 opens until it has dropped to a lower, likewise predetermined, minimum level, after which the pressure continues to build up to its maximum due to the moving piston, which can be less than or at most equal to the maximum working pressure of the mud pump 6, and the interplay continues as long continues until the piston 8 has reached an end position and can no longer push out another sludge cake through the discharge opening 11 into the discharge nozzle 27 and through the valve 3 into the collecting container 23 provided.
  • the valve 2 is then closed and the valve 1 is opened, and the process continues in the same way in the reverse order, with intermittent operation not being excluded if longer holding times are to be achieved.
  • the fresh raw sludge 21 is pumped through the valve 1 via the sludge line 7 and the telescopic tube 29 into the chamber I, the sludge being pre-dewatered and the piston 8 dewatering the pre-dewatered sludge located in chamber 11, also pressure-controlled in batches via a valve 4 provided discharge opening 10 in the collecting container 24 from the chamber 11.
  • the piston 8 reaches different end positions in the receiving chamber 25, since it runs up against the cone-shaped sludge deposits 22 forming the discharge openings 10, 11.
  • the sludge is supplied via telescopic tubes 28, 29, which are guided centrally from both end faces of the receiving chamber 25 through the container lids 17, 18 and the discharge openings 10, 11 along their central axes, the tubes being fastened to one side of the piston and preferably close to the piston provided outflow openings 26, 27 are provided for the raw sludge 21.
  • the outer wall of the cylindrical receiving chamber 25 in the bottom area or over the entire circumference with a filter layer similar to the filter candles 12 with a filter layer surrounding it at a low height is also required to subsequently enlarge the filter area and with the collecting containers 13, 14 in connection with the annular space for increased absorption of further filtrate 21.
  • the sides of the piston 8 facing the chambers I, 11 are equipped with further sieve-like filter surfaces to further enlarge the filter area and the process efficiency, at least in the piston 8 a drain for the filtrate is provided.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Molecular Biology (AREA)
  • General Engineering & Computer Science (AREA)
  • Treatment Of Sludge (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

In the case of the known discontinuous drainage processes in which the operating pressure has to be reduced to the surrounding pressure between the removal of the drained sludge cake and the refilling of the drainage apparatus, the filtering action can quickly drop off since fresh raw sludge reaches the drainage chambers only by passing already used filtering surfaces and pushing along in front of it a portion of already predrained sludge cake. The novel process is intended to permit a continuous operation with uniform pressure level and a constant, high filtering capacity while at the same time reducing the possibility of faults arising to a minimum. This is achieved in that the fresh raw sludge (21) is fed at constant pressure in the opposite direction in each case to the direction of movement of the piston (8), in particular in the immediate vicinity of the piston, to the filtering surface shortly after the latter has been swept over by the piston and thereby cleaned. The process and the apparatus for carrying out the process thus make it possible for aqueous sludges to be drained continuously by means of pressure. <IMAGE>

Description

Die Erfindung betrifft ein Verfahren gemäß der im Oberbegriff des Hauptanspruches genannten Art.The invention relates to a method according to the type mentioned in the preamble of the main claim.

Ein bekanntes Verfahren dieser Art wird in der nicht vorveröffentlichten Patentanmeldung P 40 20 405.7 beschrieben, deren Aufnahmekammer für den Schlamm an einer Stirnseite über einen verschließbaren Deckel verfügt, der zum Ausschieben des Filterkuchens geöffnet werden kann und bei dem frischer Rohschlamm an der gegenüberliegenden Stirnseite der Aufnahmekammer zugeführt wird.A known method of this type is described in the unpublished patent application P 40 20 405.7, the receiving chamber for the sludge has a closable cover on one end face, which can be opened for pushing out the filter cake, and in the fresh raw sludge on the opposite end face of the receiving chamber is fed.

Von Nachteil bei diesem Verfahren ist zun einen, daß es diskontinuierlich abläuft und während des Auschubhubes auf der Ausschubseite keine weitere Entwässerung stattfindet. und zum anderen, daß der frisch zugeführte Rohschlamm bereits entwässerten Filterkuchen passieren, bzw. einen Teil davon, sowie den Kolben vor sich herschieben muß, wobei der Schlamm immer auf bereits benutzte Filterflächen gelangt, was bei problematischen Schlämmen, die die Filteröffnungen verkleben können dazu führt, daß der Prozeß abgebrochen und die gesamte Charge zurückgepumpt werden muß.A disadvantage of this method is that it runs discontinuously and no further dewatering takes place on the extension side during the extension stroke. and on the other hand that the freshly supplied raw sludge must pass through already dewatered filter cake, or part of it, and push the plunger in front of it, whereby the sludge always gets onto filter surfaces that have already been used, which leads to problematic sludge that can clog the filter openings that the process has to be stopped and the entire batch has to be pumped back.

Der vorliegenden Erfindung liegt die Aufgabe zugrunde, ein Verfahren zu schaffen, in dem der Schlamm während jedes Kolbenhubes vor- bzw. nachentwässert wird ohne den Arbeitsdruck der Schlammpumpe vermindern zu müssen und bei dem dem frisch zugeführten Rohschlammeine ständig saubere Filterfläche zur Verfügung gestellt wird.The present invention has for its object to provide a method in which the sludge is dewatered during each piston stroke without having to reduce the working pressure of the sludge pump and in which the freshly supplied raw sludge is constantly provided with a clean filter surface.

Die erfindungsgemäße Lösung dieser Aufgabe wird durch den kennzeichnenden Teil des ersten Patentanspruches vermittelt.The achievement of this task is conveyed by the characterizing part of the first claim.

Von besonderem Vorteil bei diesem Verfahren ist, daß der frische Rohschlamm unmittelbar hinter dem sich weiterbewegenden Kolben zugeführt werden kann, wobei der Kolben die überstrichenen Filterflächen der Filterkerzen von daran anhaftenden und die sehr kleinen Filteröffnungen verschließenden Schlammablagerungen befreit, so daß dem eingepumpten Schlamm immer saubere Filterfläche zur Verfügung steht. Weiterhin bietet der doppelseitig wirkende Kolben den Vorteil, diese Art der Schlammzuführung in beiden Bewegungsrichtungen des Kolbens zu realisieren, wodurch sich das Verfahren quasi kontinuierlich durchführen läßt und sich in jedem Betriebszustand entwässernder Schlamm in beiden Kammern befindet.A particular advantage of this process is that the fresh raw sludge can be fed directly behind the moving piston, whereby the piston frees the coated filter surfaces of the filter cartridges from adhering sludge deposits that close the very small filter openings, so that the pumped-in sludge always has a clean filter surface is available. Furthermore, the double-acting piston offers the advantage of realizing this type of sludge feed in both directions of movement of the piston, which means that the process can be carried out virtually continuously and there is sludge dewatering in both chambers in every operating state.

Weitere bevorzugte Ausgestaltungen der Erfindung werden in den Unteransprüchen beschrieben.Further preferred embodiments of the invention are described in the subclaims.

Besonders vorteilhaft ist der Umstand, daß auch zur Bewegungsumkehr des Kolbens und zum Austragen des Schlammkuchens der Arbeitsdruck der Schlammpumpe nicht heruntergefahren werden muß, so daß diese immer mit einem konstanten Arbeitsdruck durchlaufen kann.The fact that the working pressure of the sludge pump does not have to be reduced so that it can always run at a constant working pressure is also particularly advantageous in order to reverse the movement of the piston and to discharge the sludge cake.

Da das Austragen des Schlammkuchens nicht gegen Atmosphärendruck, sondern einen gegenüber dem Pumpendruck nur etwas geringeren Druck, der zwischen zwei einstellbaren Extremwerten pendelt, vonstatten geht, wird dadurch, daß der Druck nicht bei jeder Füllung neu aufgebaut werden muß, sondern von Anfang an vorhanden ist, zum einen ein hoher Vorentwässerungsgrad erreicht und zum anderen ein hoher Entwässerungsgrad verwirklicht, und zwar dadurch, daß der Schlammkuchen weiterhin unter Druck gehalten wird, so daß insgesamt eine lange wirksame Verweilzeit des Schlammes in der Aufnahmekammer erreicht wird. Vorteilhaft ist dabei weiterhin die Homogenität des Schlammkuchens, da das Verfahren so gestaltet ist, daß die sich hinter dem Kolben aufbauenden Schlammschichten ungefähr in der gleichen zeitlichen Reihenfolge ihrer Entstehung wieder ausgetragen werden und so ein Schlammkuchen mit gleicher Feuchtigkeitsverteilung entsteht.Since the discharge of the mud cake does not take place against atmospheric pressure, but rather a slightly lower pressure than the pump pressure, which oscillates between two adjustable extreme values, this means that the pressure does not have to be built up again with each filling, but is available from the beginning , on the one hand achieves a high degree of pre-dewatering and on the other hand realizes a high degree of dewatering by keeping the sludge cake under pressure so that overall a long effective dwell time of the sludge is achieved in the receiving chamber. The homogeneity of the sludge cake is also advantageous, since the process is designed in such a way that the sludge layers building up behind the piston are discharged again in approximately the same chronological order of their formation, and a sludge cake with the same moisture distribution is thus produced.

Nachfolgend wird die Erfindung anhand einer Zeichnung eines Ausführungsbeispieles einer Vorrichtung zur Durchführung des Verfahrens, der Figur 1, näher erläutert.The invention is explained in more detail below with reference to a drawing of an exemplary embodiment of a device for carrying out the method, FIG. 1.

Zur Einleitung des Verfahrens wird in einer Vorstufe in einer der beiden leeren Kammern I, 11, der Aufnahmekammer 25, beispielsweise in die Kammer I, mit über die Pumpe 5 mit Flockungsmittel versetzter Rohschlamm durch das geöffnete Ventil 1, die Schlammzuleitung 7 und das teleskopierbare Rohr 29 eingepumpt. Der Kolben 8 wird dabei bis zu einem mechanischem Anschlag in Richtung der leeren Kammer 11, diese ständig verkleinert, geschoben. Hat er diesen erreicht, wird solange weiter Rohschlamm zugeführt, bis der gewünschte Betriebsdruck erreicht ist. Das dabei entstehende Filtrat 30 fließt durch die Filterkerzen 12 in die in den Behälterdeckeln 17,18 angeordneten Sammelbehälter 13, 14 und wird anschließend über die Abflüsse 15,16 abgeführt.To initiate the process, in a preliminary stage in one of the two empty chambers I, 11, the receiving chamber 25, for example into chamber I, with raw sludge mixed with flocculant via the pump 5 through the opened valve 1, the sludge feed line 7 and the telescopic pipe 29 pumped in. The piston 8 is pushed up to a mechanical stop in the direction of the empty chamber 11, which is constantly reduced. Once he has reached this, raw sludge continues to be added until the desired operating pressure is reached. The resulting filtrate 30 flows through the filter candles 12 into the collecting containers 13, 14 arranged in the container lids 17, 18 and is then discharged via the outlets 15, 16.

Ist der Betriebsdruck von ca. 14 bis 16 bar erreicht, der von zwei jeweils im Deckelbereich der Kammer I und 11 angeordneten Drucksensoren bzw. Druckmeßgeräten aufgenommen und einer elektronischen Regeleinheit zugeführt wird, schließt das Ventil 1 und öffnet das Ventil 2 , so daß der frische Rohschlamm 21 durch das Ventil 2, die Schlammzuleitung 9 und das teleskopierbare Rohr 28 in die Kammer 11 gelangt, bis dort ebenfalls Betriebsdruck erreicht wird. Der Druck in der nicht mit Rohschlamm beaufschlagten Kammer I, wird nun vom Kolben 8 erzeugt und dadurch aufrechterhalten, daß die mit dem Austragsstutzen 27 versehene Austragsöffnung 11 über ein Ventil 3 verschlossen ist. Erreicht der Druck in der Kammer I ein vorbestimmtes maximales Niveau, so öffnet das Ventil 3 solange, bis dieser auf ein niedrigeres, ebenfalls vorbestimmtes minimales Niveau abgefallen ist, wonach durch den sich weiterbewegenden Kolben der Druck wieder bis zu seinem Maximum, das kleiner oder höchstens gleich dem maximalem Arbeitsdruck der Schlammpumpe 6 sein kann, aufgebaut wird und sich das Wechselspiel solange fortsetzt, bis daß der Kolben 8 eine Endstellung erreicht hat und keinen weiteren Schlammkuchen mehr durch die Austragsöffnung 11 in den Austragsstutzen 27 und durch das Ventil 3 in den bereitstehenden Auffangbehälter 23 ausschieben kann. Anschließend wird das Ventil 2 geschlossen und das Ventil 1 geöffnet und der Vorgang setzt sich in gleicher Weise in umgekehrter Reihenfolge kontinuierlich fort, wobei ein diskontinuierlicher Betrieb nicht ausgeschlossen ist, wenn längere Haltezeiten verwirklicht werden sollen. Der frische Rohschlamm 21 wird durch das Ventil 1 über die Schlammleitung 7 und das teleskopierbare Rohr 29 in die Kammer I gepumpt, wobei der Schlamm vorentwässert und der Kolben 8 den in Kammer 11 befindlichen vorentwässerten Schlamm nachentwässert, ebenfalls druckgeregelt schubweise über die mit einem Ventil 4 versehene Austragsöffnung 10 in den Auffangbehälter 24 aus der Kammer 11 ausschiebt.If the operating pressure of about 14 to 16 bar is reached, which is picked up by two pressure sensors or pressure measuring devices arranged in the cover area of the chambers I and 11 and fed to an electronic control unit, valve 1 closes and valve 2 opens, so that the fresh one Raw sludge 21 passes through the valve 2, the sludge feed line 9 and the telescopic tube 28 into the chamber 11 until operating pressure is also reached there. The pressure in the chamber I not loaded with raw sludge is now generated by the piston 8 and is maintained by the fact that the discharge opening 11 provided with the discharge nozzle 27 is closed by a valve 3. When the pressure in chamber I reaches a predetermined maximum level, valve 3 opens until it has dropped to a lower, likewise predetermined, minimum level, after which the pressure continues to build up to its maximum due to the moving piston, which can be less than or at most equal to the maximum working pressure of the mud pump 6, and the interplay continues as long continues until the piston 8 has reached an end position and can no longer push out another sludge cake through the discharge opening 11 into the discharge nozzle 27 and through the valve 3 into the collecting container 23 provided. The valve 2 is then closed and the valve 1 is opened, and the process continues in the same way in the reverse order, with intermittent operation not being excluded if longer holding times are to be achieved. The fresh raw sludge 21 is pumped through the valve 1 via the sludge line 7 and the telescopic tube 29 into the chamber I, the sludge being pre-dewatered and the piston 8 dewatering the pre-dewatered sludge located in chamber 11, also pressure-controlled in batches via a valve 4 provided discharge opening 10 in the collecting container 24 from the chamber 11.

Der Kolben 8 erreicht abhängig von der Schlammkuchenbeschaffenheit und dem Entwässerungsgrad unterschiedliche Endstellungen in der Aufnahmekammer 25, da er gegen sich um die Austragsöffnungen 10,11 bildende, schüttkegelartige Schlammablagerungen 22 aufläuft.Depending on the nature of the sludge cake and the degree of dewatering, the piston 8 reaches different end positions in the receiving chamber 25, since it runs up against the cone-shaped sludge deposits 22 forming the discharge openings 10, 11.

Der jeweils in Kolbennähe und auf der der Bewegungsrichtung des Kolbens 8 entgegengesetzten Seite zugeführte Rohschlamm 21 entwässert an dem ihm dort zur Verfügung gestellten Filterflächen vor und lagert sich schichtweise hinter dem sich weiterbewegenden Kolben 8 an, der den in der anderen Kammer befindlichen nachentwässernden Schlamm in den den Austragsöffnungen 10,11 nächstgelegenen Schichten schubweise ausschiebt, so daß alle Teilschichten ungefähr gleichlange vor- und nachentwässert werden.The raw sludge 21, which is supplied near the piston and on the side opposite to the direction of movement of the piston 8, dewaters on the filter surfaces made available to it and accumulates in layers behind the moving piston 8, which sludge the dewatering sludge located in the other chamber into the pushes the layers closest to the discharge openings 10, 11 in batches, so that all sub-layers are dewatered approximately equally long.

Die Schlammzuführung erfolgt über teleskopierbare Rohre 28, 29, die von beiden Stirnseiten der Aufnahmekammer 25 aus mittig durch die Behälterdeckel 17,18 und die Austragsöffnungen 10,11 entlang ihrer Mittelachse geführt sind, wobei die Rohre jeweils an einer Kolbenseite befestigt und mit vorzugsweise in Kolbennähe vorgesehenen Ausströmöffnungen 26, 27 für den Rohschlamm 21 versehen sind. Möglich ist in einer anderen, nicht dargestellten Ausführungsform der Vorrichtung zur Durchführung des Verfahrens, die Ausströmöffnungen im Kolben selbst anzuordnen und den Rohschlamm einseitig, beidseitig oder sogar radial zuzuführen.The sludge is supplied via telescopic tubes 28, 29, which are guided centrally from both end faces of the receiving chamber 25 through the container lids 17, 18 and the discharge openings 10, 11 along their central axes, the tubes being fastened to one side of the piston and preferably close to the piston provided outflow openings 26, 27 are provided for the raw sludge 21. In another, not shown embodiment of the device for carrying out the method, it is possible to arrange the outflow openings in the piston itself and to supply the raw sludge on one side, on both sides or even radially.

Bei einer weiteren, nicht in der Figur dargestellten Variation der Vorrichtung zur Durchführung des Verfahrens ist zur auch nachträglichen Vergrößerung der Filterfläche die Außenwandung der zylindrischen Aufnahmekammer 25 im Bodenbereich oder über den gesamten Umfang mit einer den Filterkerzen 12 ähnlichen Filterschicht mit einem sie in geringer Höhe umgebenden und mit den Sammelbehältern 13,14 in Verbindung stehenden Ringraum zur vermehrten Aufnahme weiteren Filtrats 21 ausgeführt.In a further variation of the device for carrying out the method, which is not shown in the figure, the outer wall of the cylindrical receiving chamber 25 in the bottom area or over the entire circumference with a filter layer similar to the filter candles 12 with a filter layer surrounding it at a low height is also required to subsequently enlarge the filter area and with the collecting containers 13, 14 in connection with the annular space for increased absorption of further filtrate 21.

Bei einer zusätzlichen, ebenfalls nicht in einer Figur dargestellten vorteilhaften Variation der Vorrichtung zur Durchführung des Verfahrens sind zu einer weiteren Vergrößerung der Filterfläche und des Verfahrenswirkungsgrades die den Kammern I, 11 zugewandten Seiten des Kolbens 8 mit weiteren siebartigen Filterflächen ausgerüstet, wobei im Kolben 8 mindestens ein Ablauf für das Filtrat vorgesehen ist.In the case of an additional advantageous variation of the device for carrying out the method, which is also not shown in a figure, the sides of the piston 8 facing the chambers I, 11 are equipped with further sieve-like filter surfaces to further enlarge the filter area and the process efficiency, at least in the piston 8 a drain for the filtrate is provided.

Claims (13)

1. Verfahren zur Druckentwässerung von wässrigen Schlämmen unter Verwendung einer Vorrichtung mit einer Aufnahmekammer für den Schlamm, in der sich in Längsrichtung erstrekkende und über den Querschnitt verteilte Filterkerzen angeordnet sind, auf denen ein den gesamten Querschnitt ausfüllender und an den Innenseiten der Kammer geführter, mit Durchsteckkanälen für die Filterkerzen ausgerüsteter und die Aufnahmekammer in zwei Arbeitskammern unterteilender doppelseitig wirkender Kolben frei bewegbar angeordnet ist, als Antriebsmedium unter Druck geförderter Rohschlamm verwendet wird, und im Zuge der Kolbenbewegung von einer Endstellung in eine zweite Endstellung der entwässerte Schlamm ausgeschoben wird, dadurch gekennzeichnet, daß frischer Rohschlamm (21) auf der der Bewegungsrichtung des Kolbens (8) entgegengesetzten Seite, insbesondere in unmittelbarer Kolbennähe, den kurz zuvor vom Kolben (8) überstrichenen und dadurch gereinigten Filterflächen der Filterkerzen (12) zugeführt wird.1. A process for the pressure dewatering of aqueous sludges using a device with a receiving chamber for the sludge, in which longitudinally extending filter candles are arranged which are distributed over the cross section and on which a filter which fills the entire cross section and is guided on the inside of the chamber Push-through channels equipped for the filter cartridges and the double-acting piston dividing the receiving chamber into two working chambers are freely movable, raw sludge pumped under pressure is used as the drive medium, and the dewatered sludge is pushed out from one end position to a second end position in the course of the piston movement, characterized in that that fresh raw sludge (21) on the side opposite to the direction of movement of the piston (8), in particular in the immediate vicinity of the piston, the filter surfaces of the filter candles (12), which were just recently swept by the piston (8) and thus cleaned is led. 2. Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß der Kolben (8) während des Befüllens eine Arbeitskammer (1,11) mit frischem Rohschlamm (21), der dabei vorentwässert wird und gleichzeitiger Bewegung in Richtung der Kammer (11,1) deren Volumen verkleinern, mit einem konstanten Arbeitsdruck beaufschlagt wird und der bereits vorentwässerte Schlamm auf der anderen Kolbenseite nachentwässernd schubweise gegen einen geringeren bis gleichen Druck aus einer Austragsöffnung (10,11) ausgeschoben wird.2. The method according to claim 1, characterized in that the piston (8) during filling a working chamber (1,11) with fresh raw sludge (21), which is pre-dewatered and simultaneous movement in the direction of the chamber (11,1) Reduce volume, apply a constant working pressure and the pre-dewatered sludge on the other side of the piston after dewatering against a lower to the same pressure from a discharge opening tion (10,11) is pushed out. 3. Verfahren nach einem oder beiden der vorgenannten Ansprüche, dadurch gekennzeichnet, daß in einer Vorstufe des Verfahrens über eine Pumpe (5) mit Flockungsmittel versetzer Rohschlamm (21) von einer Schlammpumpe (6) über ein Ventil (1) und einer Schlammzuführung (7) in der Nähe der der Kammer (I) zugewandten Seite des Kolbens (8) in die Kammer (I) gepumpt wird, der dabei den Kolben (8) bis zu einem mechanischen Anschlag in Richtung der Kammer (11) und diese ständig verktleinernd bewegt, wonach der Rohschlamm unter Steigerung des Pumpendruckes bis auf Betriebsdruck über die Filterkerzen (12) und die beidseitig in Deckeln (17,18) angeordneten und mit Abflüssen (15,16) versehenen Sammelbehältern (13,14) vorentwässert wird.3. The method according to one or both of the preceding claims, characterized in that in a preliminary stage of the method via a pump (5) with flocculant mixed raw sludge (21) from a sludge pump (6) via a valve (1) and a sludge feed (7th ) near the side of the piston (8) facing the chamber (I) is pumped into the chamber (I), which thereby moves the piston (8) up to a mechanical stop in the direction of the chamber (11) and constantly reduces it The raw sludge is then dewatered by increasing the pump pressure up to the operating pressure via the filter candles (12) and the collecting tanks (13, 14) arranged on both sides in covers (17, 18) and provided with drains (15, 16). 4. Verfahren nach einem oder mehreren der vorgenannten Ansprüche, dadurch gekennzeichnet, daß zum Übergang von der Vorstufe zu dem Verfahren unter Beibehaltung des Pumpendruckes der Pumpe (6) das Ventil (2) geöffnet und das Ventil (1) geschlossen wird, so daß frischer Rohschlamm (21) über eine Schlammzuleitung (9) in der Nähe der der Kammer (11) zugewandten Seite des Kolbens (8) in die Kammer (2) gepumpt wird, die sich durch Verschieben des Kolbens (8) vergrößern, den noch unter Druck stehenden vorentwässerten Schlamm in Kammer (I) durch eine mit einem Ventil (3) versehene Austragsöffnung (10) solange ausschiebt, bis der Druck ausschubseitig bis auf ein vorbestimmbares Niveau abgefallen ist, wonach das Ventil solange geschlossen bleibt, bis der weiterbewegte Kolben (8) den Druck in der Kammer (I) wieder bis zu einem vorbestimmbaren Maximaldruck, der kleiner oder höchstens gleich dem des Arbeitsdruckes ist, aufgebaut hat, wonach das Ventil (3) erneut öffnet und sich dieses Wechselspiel solange fortsetzt, bis daß der Kolben (8) eine Endstellung erreicht hat und sich nach anschließender Umsteuerung der Ventile (1) und (2), Ventil (1) auf, Ventil (2) zu, der Vorgang in gleicher Weise in umgekehrter Richtung kontinuierlich fortsetzt und frischer Rohschlamm (11) über die Schlammleitung (7) in die Nähe der Kammer (I) zugewandten Seite des Kolbens (8) gepumpt wird und der bereits vorentwässerte Schlamm dabei nachentwässernd, druckgeregelt und schubweise über die mit einem Ventil (4) versehene Austragsöffnung (10) in den Auffangbehälter (24) aus der Kammer (11) ausgeschoben wird.4. The method according to one or more of the preceding claims, characterized in that for the transition from the preliminary stage to the method while maintaining the pump pressure of the pump (6), the valve (2) is opened and the valve (1) is closed, so that fresher Raw sludge (21) is pumped into the chamber (2) via a sludge feed line (9) in the vicinity of the side of the piston (8) facing the chamber (11), which increase in size due to the displacement of the piston (8), which is still under pressure the pre-dewatered sludge in chamber (I) is pushed out through a discharge opening (10) provided with a valve (3) until the pressure on the discharge side has dropped to a predeterminable level, after which the valve remains closed until the piston (8) moving on has built up the pressure in the chamber (I) again up to a predeterminable maximum pressure which is less than or at most equal to that of the working pressure, after which the valve (3) opens again and this opens The interplay continues until the piston (8) has reached an end position and after subsequent reversing of the valves (1) and (2), valve (1) open, valve (2) closes, the process in the same way in the opposite direction continuously continues and fresh raw sludge (11) is pumped via the sludge line (7) into the vicinity of the piston (8) facing the chamber (I) and the previously dewatered sludge is subsequently dewatered, pressure-controlled and in batches via a valve (4) provided discharge opening (10) in the collecting container (24) is pushed out of the chamber (11). 5. Verfahren nach einem oder mehreren der vorgenannten Ansprüche, dadurch gekennzeichnet, daß die Schlammpumpe (6) gleichmäßig mit konstantem Arbeitsdruck von 14 bis 16 bar betrieben wird.5. The method according to one or more of the preceding claims, characterized in that the slurry pump (6) is operated uniformly with a constant working pressure of 14 to 16 bar. 6. Verfahren nach einem odermehreren der vorgenannten Ansprüche, dadurch gekennzeichnet, daß sich je nach Schlammkuchenbeschaffenheit und Entwässerungsgrad unterschiedliche Endstellungen des Kolbens (8) einstellen, da der Schlamm sich um die Austragsöffnungen (10,11) schüttkegelartig ablagert, der Kolben (8) auf diesen Schüttkegel (22), oder bei Nichtvorhandensein auf die Behälterdeckel (17,18) aufläuft und genau dann eine Endstellung erreicht, wenn er auf der Ausschubseite mangels weiteren Kompressionsweges den Mindestdruck zum Öffnen des Austragsventils (3,4) nicht mehr erzeugen kann.6. The method according to one or more of the preceding claims, characterized in that depending on the nature of the sludge cake and degree of dewatering different end positions of the piston (8) set, since the sludge is deposited around the discharge openings (10,11) like a cone, the piston (8) this pouring cone (22), or in the absence of this, runs onto the container lid (17, 18) and reaches an end position precisely when it can no longer generate the minimum pressure for opening the discharge valve (3, 4) due to the lack of a further compression path. 7. Verfahren nach einem oder mehreren der vorgenannten Ansprüche, dadurch gekennzeichnet, daß sich der in Kolbennähe in eine Kammer (1,11) gepreßte Rohschlamm (21) an der ihm dort zur Verfügung gestellten sauberen Filterfläche vorentwässert und sich als Filterkuchen schichtweise hinter dem weiterbewegten Kolben (8) ablagert und der in der anderen Kammer (11,1) nachentwässernde Filterkuchen schubweise so ausgeschoben wird, daß eine der Austragsöffnung nächstgelegene Schicht des Schlammkuchens in bereitstehende Auffangbehälter (23,24) gelangt, so daß alle Teilschichten des Filterkuchens ungefähr gleichlange, in der Filterkammer vorund nachentwässert werden.7. The method according to one or more of the preceding claims, characterized in that the near the piston in a chamber (1,11) pressed raw sludge (21) on the clean filter surface provided there and dewatered as a filter cake in layers behind the moved Piston (8) is deposited and the filter cake dewatered in the other chamber (11, 1) is pushed out in batches in such a way that a layer of the mud cake closest to the discharge opening gets into the waiting container (23, 24), so that all sub-layers of the filter cake are of approximately the same length. be dewatered in the filter chamber before and after. 8. Verfahren nach einem oder mehreren der vorgenannten Ansprüche, dadurch gekennzeichnet, daß der Rohschlamm (21) durch teleskopierbare Rohre (28,29), die von beiden Stirnseiten der Aufnahmekammern (20) mittig durch beide Behälterdeckel (17,18) und Austragsöffnungen (10,11) entlang der Mittelachse der Aufnahmekammer (25) geführt und jeweils an einer Kolbenseite befestigt sind, zugeführt wird, wobei der Rohschlamm (21) durch vorzugsweise in Kolbennähe vorgesehene Ausströmöffnungen (26,27) austritt.8. The method according to one or more of the preceding claims, characterized in that the raw sludge (21) by telescopic tubes (28,29), the two end faces of the receiving chambers (20) centrally through both container lids (17,18) and discharge openings ( 10, 11) are guided along the central axis of the receiving chamber (25) and are each attached to one side of the piston, the raw sludge (21) exiting through outflow openings (26, 27) preferably provided near the piston. 9. Verfahren nach einem oder mehreren der vorgenannten Ansprüche, dadurch gekennzeichnet, daß die Ausströmöffnungen (26,27) auch im Kolben selbst angeordnet sein können und der Rohschlamm (21) einseitig, beidseitig oder radial zugeführt werden kann.9. The method according to one or more of the preceding claims, characterized in that the outflow openings (26, 27) can also be arranged in the piston itself and the raw sludge (21) can be supplied on one side, on both sides or radially. 10. Verfahren nach einem oder mehreren der vorgenannten Ansprüche, dadurch gekennzeichnet, daß der Arbeitsdruck in den Kammern (1,11) von je einem im Deckelbereich angeordneten Drucksensor bzw. Druckmeßgerät aufgenommen und einer elektronischen Regeleinheit zugeleitet wird.10. The method according to one or more of the preceding claims, characterized in that the working pressure in the chambers (1,11) is received by a pressure sensor or pressure measuring device arranged in the lid area and is fed to an electronic control unit. 11. Vorrichtung zur Durchführung des Verfahrens, dadurch gekennzeichnet, daß die Aufnahmekammer (25), ebenso wie die Filterkerzen (12) und dem darauf verschieblich angeordneten Kolben (8), zylindrisch und mit ihrer Längsachse horizontal angeordnet ausgeführt sind und die Aufnahmekammer (20) seitlich mit Deckeln (17,18) versehen ist, durch die mit einem großen Durchmesser die an ihrem Ende mit Austragsventilen (3,4) versehenen Austragsstutzen (26,27) zentrisch geführt sind, durch die ebenfalls zentrisch, mit kleinerem Durchmesser, teleskopierbare Rohre (28,29) bis zu dem Kolben (8) durchgeführt und an diesem befestigt sind, durch deren, in dessen unmittelbarer Nähe angeordneten Ausströmöffnungen(26,27) der über die an die Rohre (28,29) angeschlossener Schlammleitungen (7,9), die Pumpe (6) sowie die Ventile (1,2) pumpbarer Rohschlamm zuführbar ist, und daß die mit der Aufnahmekammer (25) fest verbundenen Deckel (17,18) Sammelbehälter (13,14) aufweisen,durch die das durch die Filterkerzen (12) abfließende Filtrat (30) über angeschlossene Abflüsse (15,16) ableitbar ist.11. A device for performing the method, characterized in that the receiving chamber (25), like the filter candles (12) and the piston (8) slidably arranged thereon, are cylindrical and are arranged horizontally with their longitudinal axis, and the receiving chamber (20) is provided laterally with lids (17, 18), through which the discharge nozzles (26, 27) provided with discharge valves (3, 4) at their end with a large diameter are guided centrally, through which telescopic pipes are also centric, with a smaller diameter (28, 29) to the piston (8) and are fastened to it, through the outlet openings (26, 27) arranged in its immediate vicinity of the sludge lines (7, 9) connected to the pipes (28, 29) ), the pump (6) and the valves (1, 2) pumpable raw sludge can be supplied, and that the lid (17, 18), which is firmly connected to the receiving chamber (25), has collecting containers (13, 14) through which the di e Filter candles (12) draining off filtrate (30) can be drained off via connected drains (15, 16). 12. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, daß die Außenwandung der zylindrischen Aufnahmekammer (25) im Bodenbereich oder über ihren gesamten Umfang als siebartige Filterschicht mit einem diese in geringer Höhe umgebenden und mit den Sammelbehältern (13,14) verbundenen Ringraum ausführbar ist.12. The apparatus according to claim 11, characterized in that the outer wall of the cylindrical receiving chamber (25) in the bottom region or over its entire circumference as a sieve-like filter layer with a surrounding this at a low height and connected to the collecting containers (13, 14) can be executed. 13. Vorrichtung nach Anspruch 11, dadurch gekennzeichnet, daß die den Kammer I, II zugewandten Seiten des Kolbens (8) siebartige Filterflächen aufweisen und der Kolben über mindestens einen Ablauf für das Filtrat erfüllt.13. The apparatus according to claim 11, characterized in that the chamber I, II facing sides of the piston (8) have sieve-like filter surfaces and the piston fulfills at least one outlet for the filtrate.
EP91115039A 1990-10-10 1991-09-06 Process for dehydrating aqueous sludges by means of pressure Expired - Lifetime EP0480176B1 (en)

Applications Claiming Priority (2)

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DE4032145A DE4032145C1 (en) 1990-10-10 1990-10-10
DE4032145 1990-10-10

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EP0480176A1 true EP0480176A1 (en) 1992-04-15
EP0480176B1 EP0480176B1 (en) 1994-08-17

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AT (1) ATE110024T1 (en)
DE (2) DE4032145C1 (en)
DK (1) DK0480176T3 (en)
ES (1) ES2057690T3 (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0587080A1 (en) * 1992-09-11 1994-03-16 Nagaoka International Corporation Sludge dehydrating press and method for treating sludge
EP0663227A1 (en) * 1994-01-12 1995-07-19 Nagaoka International Corporation Sludge dehydrating press and method for treating sludge
DE19947044A1 (en) * 1999-09-30 2001-05-17 Osram Opto Semiconductors Gmbh Surface mount optoelectronic component with reflector and method for producing the same

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4223503A1 (en) * 1992-07-17 1994-01-20 Mueller Umwelttechnik Appts. for disposal of slurries contg. oil or other grease - comprises slurry press whose filtrate is segregated into oil, water and oil slurry phases
ITRM980190A1 (en) * 1998-03-25 1998-06-25 Gioia Antonio La CAGE CONCRETE DRYER
DE102009008904A1 (en) * 2009-02-13 2010-09-02 Gosatec Gmbh Apparatus and method for liquid separation
AT508024B1 (en) * 2009-06-18 2010-10-15 Celtec Gmbh DEVICE FOR REMOVING GREEN SOLIDS

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE198415C (en) * 1905-12-26
DE249275C (en) *
DE263722C (en) * 1912-04-06 1913-09-09 Roth Philipp
DE1035101B (en) * 1955-05-25 1958-07-31 Dr Hans Heymann Filter press

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE3641180A1 (en) * 1986-12-02 1988-06-16 Mueller Umwelttechnik DEVICE FOR PRESSURE DRAINAGE OF AQUEOUS SLUDGE
DK158149C (en) * 1987-03-31 1990-08-27 Optimal Miljoeteknik Aps SLAM DRAINAGE DEVICE

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE249275C (en) *
DE198415C (en) * 1905-12-26
DE263722C (en) * 1912-04-06 1913-09-09 Roth Philipp
DE1035101B (en) * 1955-05-25 1958-07-31 Dr Hans Heymann Filter press

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0587080A1 (en) * 1992-09-11 1994-03-16 Nagaoka International Corporation Sludge dehydrating press and method for treating sludge
AU666214B2 (en) * 1992-09-11 1996-02-01 Nagaoka International Corporation Sludge dehydrating press and method for treating sludge
EP0663227A1 (en) * 1994-01-12 1995-07-19 Nagaoka International Corporation Sludge dehydrating press and method for treating sludge
US5643458A (en) * 1994-01-12 1997-07-01 Nagaoka International Corporation Sludge dehydrating press and method for treating sludge
DE19947044A1 (en) * 1999-09-30 2001-05-17 Osram Opto Semiconductors Gmbh Surface mount optoelectronic component with reflector and method for producing the same

Also Published As

Publication number Publication date
EP0480176B1 (en) 1994-08-17
ATE110024T1 (en) 1994-09-15
DE59102559D1 (en) 1994-09-22
DE4032145C1 (en) 1992-01-16
DK0480176T3 (en) 1994-12-05
ES2057690T3 (en) 1994-10-16

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