WO2000021893A2 - Procede de traitement de boues et dispositif pour mettre en oeuvre ledit procede - Google Patents

Procede de traitement de boues et dispositif pour mettre en oeuvre ledit procede Download PDF

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Publication number
WO2000021893A2
WO2000021893A2 PCT/EP1999/007559 EP9907559W WO0021893A2 WO 2000021893 A2 WO2000021893 A2 WO 2000021893A2 EP 9907559 W EP9907559 W EP 9907559W WO 0021893 A2 WO0021893 A2 WO 0021893A2
Authority
WO
WIPO (PCT)
Prior art keywords
sludge
binder
mixing
mixer
polymer
Prior art date
Application number
PCT/EP1999/007559
Other languages
German (de)
English (en)
Other versions
WO2000021893A3 (fr
WO2000021893A8 (fr
Inventor
Utmar Christiansen Erler
Wolfgang Werner Hensel
Original Assignee
Dosa Wasser- Und Schlammaufbereitungs Gmbh
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Dosa Wasser- Und Schlammaufbereitungs Gmbh filed Critical Dosa Wasser- Und Schlammaufbereitungs Gmbh
Priority to AU63364/99A priority Critical patent/AU6336499A/en
Publication of WO2000021893A2 publication Critical patent/WO2000021893A2/fr
Publication of WO2000021893A3 publication Critical patent/WO2000021893A3/fr
Publication of WO2000021893A8 publication Critical patent/WO2000021893A8/fr

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/008—Sludge treatment by fixation or solidification

Definitions

  • the invention relates to a method for processing sludge and an apparatus for performing the method.
  • the present invention has for its object to provide a more efficient process for sludge processing and a device for performing this method compared to the prior art.
  • the method according to the invention which achieves this object is characterized in that the sludge is solidified by admixing a binder with the connection of sludge water.
  • the solidification does not take place through drainage. Rather, water and other sludge constituents are bound by the binding agent in such a way that an at least puncture-resistant preparation material is formed, which is in solid form. landfills, even on slopes, can be deposited. There is no sludge regression by the action of precipitation. The driveability of the deposits remains guaranteed. Residues of unbound water remaining during solidification can be easily separated and used.
  • the sludge is mixed with a binder containing a polymer.
  • the binder contains a polyacrylamide or a mixture of different polyacrylamides depending on the type of sludge to be disposed of.
  • the polymer is emulsified during the preparation of the binder, an oil emulsion of the polymer in particular being produced.
  • the polymer is mixed with an activator substance which influences its binding ability.
  • a salt solution with a trivalent metal ion is particularly suitable as such an activator substance, the preferred embodiment of the invention being a sulfate solution, in particular aluminum sulfate solution.
  • the AI 3+ ions ensure activation of the polymer in such a way that elongated polymer chains which, in cooperation with the metal ions, are capable of binding water and other sludge constituents are formed.
  • the emulsion is preferably mixed into the activator substance, the emulsification permitting particularly rapid mixing of the mixture components.
  • a blocking substance is added to the activator substance, which prevents undesired activation of the polymer before the addition of the binder to the sludge.
  • a salt is introduced as a blocking substance, which, however, forms the same anions as monovalent metal ions, by means of which the polymer cannot be activated with the formation of linearly stretched chains.
  • the blocking salt is preferably added to saturation in order to reduce the number of activatable metal ions with a higher charge.
  • sodium sulfate is introduced into the aluminum sulfate solution as a blocking substance until it is saturated.
  • the binder is advantageously added to the sludge with intensive mixing of the two components in the first contact phase, an eccentric screw pump preferably being used for this purpose, into which the sludge and the binder are introduced together in close physical contact with one another. With the rapid mixing, the binder comes into contact with the sludge water, which removes the saturation of the blocking agent and trivalent metal ions can be formed to activate the polymer.
  • the intensive mixing with high mechanical mixing performance ensures that the polymer is already finely distributed in the sludge material before the formation of elongated chains, which would hinder further mixing, is complete.
  • the binder is advantageously mixed directly into the thick sludge, neither predilution of the sludge nor of the binder taking place.
  • the intensive mixing in the first contact phase is followed by further mixing phases in which the material to be processed is stirred. This leads to an increasing accumulation of water and other components of the sludge on the polymer chains.
  • the material to be processed preferably runs through a drying section for separating unbound water residues.
  • water residues facilitate the movement of agitators and the conveyance of the reprocessed material due to their lubricating effect.
  • the device for carrying out the method is characterized by a storage container for a binder, a metering device for adding the binder to the sludge and a mixer device for adding the binder to the sludge.
  • the mixer device has an eccentric screw pump for intensive mixing of the sludge and binder in the first contact phase.
  • This screw pump can also be used to suck up the processed sludge.
  • the mixer device has mixer components arranged downstream of the eccentric screw pump, the mechanical mixing work performance decreasing from component to component.
  • agitators are preferably provided for further circulation of the material to be treated, the eccentric screw pump in particular being the material to be processed vertically conveying mixer is arranged with a paddle mixer.
  • this mixer is not only used for mixing but also for conveying the processed material.
  • the mixer with the wing stirrer is followed by a screw conveyor device with a transport screw and mixing blades attached to the transport screw.
  • the intensity of the mixing through the mixing blades decreases in the conveying direction by reducing the number of mixing blades provided per unit length in the conveying direction.
  • the treatment device has a device downstream of the mixer device for separating unbound water residues, which is formed in particular by a belt transport device with a water-permeable belt.
  • An upper belt holding the reprocessed material on the belt can be arranged above the water-permeable belt.
  • the separating device expediently comprises a tub collecting container which is connected to a water circuit in which the separated water which is collected in the tub collecting container is fed for reuse.
  • the device is installed on a vehicle, which facilitates its implementation at different locations.
  • FIG. 1 shows a schematic representation of a device according to the invention for carrying out the method according to the invention
  • FIG. 2 shows a detail of the device from FIG. 1
  • FIG. 3 shows a diagram explaining the production of a binder.
  • the reference number 1 in FIG. 1 denotes a sludge treatment device mounted on a mobile carrier device 2.
  • the mobile carrier device can be a modified commercial vehicle, for example a truck, suitable for receiving the sludge treatment device.
  • the sludge preparation device has a container 3 for holding a binder 30, the composition and manufacture of which is explained below with reference to FIG. 3.
  • the reservoir 3 is connected to a pump via a pipeline 4.
  • a pump via a pipeline 4.
  • it is an eccentric screw pump 5 with a maximum delivery rate of 18 l of binder per hour.
  • the eccentric screw pump 5 On the output side, the eccentric screw pump 5 is connected to a pipe branch 7 via a pipe 6. At the pipe branch 7 shown separately in FIG. 2, the pipeline 6 and a sludge feed line 8 unite in a short connecting line 9 of a further eccentric screw pump 10. As indicated by a broken line 11 in FIG. 1, the eccentric screw pump 5 and the pipe branch 7 form a metering device for supplying binder to the sludge to be treated, which is fed through line 8.
  • the sludge-promoting eccentric screw has low-wear, ductile-coated functional parts and is designed in the exemplary embodiment shown for sludge delivery rates between 300 and 1800 liters per hour.
  • the eccentric screw pump 10 is connected via a pipe 12 to a mixer 13 which contains an agitator 14 which can be driven by an electric motor 15.
  • the agitator 14 has four agitators at different heights, which both stir the material in the mixer and convey it vertically upwards.
  • the mixer 13 has an inner diameter of 200 mm and a height of 900 mm.
  • a downwardly inclined feed line 16 is connected on the output side, which ends at a screw conveyor device 17 with a double helical screw 18.
  • the double spiral screw 18 can be driven by an electric motor 19.
  • the inside diameter of the screw conveyor 17 is 250 mm and its length is 1900 mm.
  • Mixing vanes 20 are provided on the double spiral screw 18, the number of mixing vanes in relation to the axial length decreasing in the conveying direction.
  • thirty mixing blades are arranged in the first third and ten mixing blades in the second third.
  • the third third is free of mixed wings and is only for promotion.
  • the screw conveyor device like the eccentric screw pump 10 and the mixer 13, therefore fulfills both a mixer and a conveyor function.
  • material conveyed can reach a conveyor belt 21 on the output side of the screw conveyor device 17.
  • the conveyor belt 21 is designed as a screen belt and can be moved via drive devices, not shown.
  • a collecting trough 22 for water residues separated from the material to be treated is arranged under the conveyor belt 21.
  • a connection 23 on the collecting trough 22 serves to return the collected water into a water circuit.
  • An upper belt 24 is arranged above the conveyor belt 21, which ensures that material conveyed on the conveyor belt 21 is prevented from slipping sideways.
  • processed material conveyed by the conveyor belt 21 reaches a suitable collecting container or a suitable transport device for removal.
  • Reference number 26 denotes a fresh water pump which can be connected to a fresh water source and has a connected syringe hose 27 for generating a cleaning jet.
  • the functional units contained in the sludge treatment device 1, in particular the conveyor belts 22, 24 and the screw conveyor device 17, can be cleaned with the cleaning jet.
  • Starting substances in the present exemplary embodiment are an oil emission 28 of a polyacrylamide and an aluminum sulfate solution 29 in which sodium sulfate is dissolved until saturation.
  • the polyacrylamide emulsified with a mineral oil is mixed into the aluminum sulfate solution in a short, as intensive a mixing process as possible, the maximum mixing time being, for example, only a maximum of 5 seconds.
  • a certain polyamide or a mixture of several polyamides is used.
  • a binder is produced which is particularly suitable for processing clay-containing sludges resulting from gravel washing.
  • the eccentric screw pump 5 provides a suitable metering of the binder conveyed from the storage container 3, the amount of binder supplied per ton of sludge in the exemplary embodiment in question being between 1.5 and 1.5 kg. Contrary to the small amount of binder conveyed, the cross section of the pipeline 6 is smaller than the cross section of the pipeline 8, as can be seen from FIG. 2.
  • the material to be conveyed is conveyed via the pipeline 12 to the mixer 13, in which the material to be conveyed is further circulated by the agitator 14 driven by the motor 15.
  • This agitation is also relatively intensive insofar as vertical conveying of the material to be conveyed in the mixer 13 is associated with it and the agitation by the impeller must take place against gravity.
  • unbound residues of sludge water advantageously provide suitable lubrication in such a way that the material to be treated glides along the inner wall of the mixer and thus a promotion of the material to be processed by the motor 15 is relatively low energy consumption can take place.
  • the material to be processed is already so poorly fluid that vertical conveyance in the mixer using the eccentric screw pump 10 alone would no longer be possible without the involvement of the blades of the agitator.
  • the material to be processed Under the influence of its gravity, the material to be processed reaches the screw conveyor 17 via the conveying line 16, where it is further mixed during transport and where unbound residual water is separated from the material to be processed. From the outlet of the screw conveyor device at 20, the material to be processed arrives at the sieve conveyor belt 21, whereby the separated water can run off the material to be processed and can reach the collecting trough 22 during the conveyance over the belt section.
  • the upper conveyor belt 24 ensures that the material to be conveyed is held on the conveyor belt 21.
  • the water collected in the tub 22 can be fed to a water cycle and e.g. can be reused for gravel washing.
  • the processed material delivered at 25 has a puncture-resistant consistency, so that it can be deposited particularly on slopes.
  • the nature of the treatment can ensure that there is no sludge regression even after subsequent moistening.
  • the processing material is different from sludge in means of transport for solid materials, such as gravel and. Like., transportable.
  • the device described with reference to FIGS. 1 to 3 can be designed so variably in its components that it can be used to process different types of sludge.

Abstract

L'invention concerne un procédé de traitement de boues et un dispositif pour mettre en oeuvre ledit procédé. Dans la technique antérieure, le traitement d'élimination des boues s'effectue par déshydratation de ces dernières. Selon l'invention, la solidification des boues ne se produit pas par déshydratation. Les boues sont solidifiées par addition d'un liant et fixation de l'eau contenue dans les boues. De manière avantageuse, les boues ainsi traitées peuvent être éliminées par dépôt dans des décharges pour matières solides.
PCT/EP1999/007559 1998-10-09 1999-10-08 Procede de traitement de boues et dispositif pour mettre en oeuvre ledit procede WO2000021893A2 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU63364/99A AU6336499A (en) 1998-10-09 1999-10-08 Method for treating sludges and a device for carrying out said method

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19846564.5 1998-10-09
DE1998146564 DE19846564A1 (de) 1998-10-09 1998-10-09 Verfahren zur Aufbereitung von Schlämmen und Vorrichtung zur Durchführung des Verfahrens

Publications (3)

Publication Number Publication Date
WO2000021893A2 true WO2000021893A2 (fr) 2000-04-20
WO2000021893A3 WO2000021893A3 (fr) 2000-08-10
WO2000021893A8 WO2000021893A8 (fr) 2000-09-28

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1999/007559 WO2000021893A2 (fr) 1998-10-09 1999-10-08 Procede de traitement de boues et dispositif pour mettre en oeuvre ledit procede

Country Status (3)

Country Link
AU (1) AU6336499A (fr)
DE (1) DE19846564A1 (fr)
WO (1) WO2000021893A2 (fr)

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4518508A (en) * 1983-06-30 1985-05-21 Solidtek Systems, Inc. Method for treating wastes by solidification
EP0388108A2 (fr) * 1989-03-13 1990-09-19 Ciba Specialty Chemicals Water Treatments Limited Traitement des résidus du procédé Bayer
WO1996037263A1 (fr) * 1995-05-24 1996-11-28 Asset Associates Limited Procede de fabrication de produits a partir de matieres-dechets

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4518508A (en) * 1983-06-30 1985-05-21 Solidtek Systems, Inc. Method for treating wastes by solidification
EP0388108A2 (fr) * 1989-03-13 1990-09-19 Ciba Specialty Chemicals Water Treatments Limited Traitement des résidus du procédé Bayer
WO1996037263A1 (fr) * 1995-05-24 1996-11-28 Asset Associates Limited Procede de fabrication de produits a partir de matieres-dechets

Also Published As

Publication number Publication date
WO2000021893A3 (fr) 2000-08-10
DE19846564A1 (de) 2000-04-20
AU6336499A (en) 2000-05-01
WO2000021893A8 (fr) 2000-09-28

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