WO2000021893A2 - Method for treating sludges and a device for carrying out said method - Google Patents

Method for treating sludges and a device for carrying out said method 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
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WO
WIPO (PCT)
Prior art keywords
binder
sludge
characterized
mixing
method
Prior art date
Application number
PCT/EP1999/007559
Other languages
German (de)
French (fr)
Other versions
WO2000021893A3 (en
WO2000021893A8 (en
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
Priority to DE19846564.5 priority Critical
Priority to DE1998146564 priority patent/DE19846564A1/en
Application filed by Dosa Wasser- Und Schlammaufbereitungs Gmbh filed Critical Dosa Wasser- Und Schlammaufbereitungs Gmbh
Publication of WO2000021893A2 publication Critical patent/WO2000021893A2/en
Publication of WO2000021893A3 publication Critical patent/WO2000021893A3/en
Publication of WO2000021893A8 publication Critical patent/WO2000021893A8/en

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Classifications

    • CCHEMISTRY; METALLURGY
    • C02TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02FTREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00Treatment of sludge; Devices therefor
    • C02F11/008Sludge treatment by fixation or solidification

Abstract

The invention relates to a method for treating sludges and to a device for carrying out said method. The treatment for disposing of sludges is carried out by abstracting water contained in the sludge. According to the invention, solidification does not occur as a result of water abstraction. The sludge is instead solidified by admixing a binding agent while binding to water contained in the sludge. The sludge treated in this manner can be advantageously disposed of in waste disposal sites for solid materials.

Description

Description:

"Process for the treatment of sludges and apparatus for performing the method"

The invention relates to a method for treatment of sludge and an apparatus for carrying out the method.

The disposal of sludge treatment as in various technical fields such as mining, metallurgy industry, chemical industry and produced during the sewage treatment, poses particular problems. For disposal of the liquid material are required sump. Should be carried out to dry the sludge to settle it later on solids landfills, pools are required less depth, which occupy large areas accordingly. Conventional methods for rapid solidification of sludge based on a withdrawal of the water contained in the sludge, including especially pressing means are used. Such pressing devices are complicated in structure and are subject to high wear. Finally, the required to Preßentwässerung energy consumption is relatively large.

The present invention has for its object to provide a comparison with the prior art more efficient method for sludge treatment and an apparatus for performing this method.

The achieving this object the method according to the invention is characterized in that the slurry is solidified by admixing a binder with access of muddy water.

In contrast to the prior art, the consolidation does not take place by dehydration. Rather, water and other slurry components are bound by the binder such that an at least puncture resistant processing material is created, which dumps in solids, can be deposited also on slopes. There is no mud regression by exposure to rainfall. The negotiability of the deposits is guaranteed. Upon solidification remaining residues of unbound water deposited and a use can be easily supplied.

In a preferred embodiment of the invention, the sludge is mixed with a binder containing a polymer. In particular, the binder containing a polyacrylamide or a mixture of various polyacrylamides according to the type of sludge to be disposed of.

In the preferred embodiment of the invention, the polymer in particular, an oil emulsion of the polymer is prepared is emulsified in the preparation of the binder.

Further, in the preferred embodiment, the polymer is mixed with a binding capacity influencing its activator. As such an activator, especially a saline solution having a trivalent metal ion is contemplated, which is, is in the preferred embodiment of the invention to a sulfate solution, in particular aluminum sulfate solution. The Al 3+ ions provide for activation of the polymer such that elongated form, in cooperation with the metal ions for the connection of water and other sludge components capable polymer chains.

Preferably, the emulsion is mixed in the activator, wherein the emulsifier Government by a particularly rapid mixing of the blend components is made possible.

In the preferred embodiment of the invention, the activator is added to a blocking substance prevents unwanted activation of the polymer before the addition of the binder to the slurry.

In the above-mentioned salt solution with the trivalent metal ion is a salt as a blocking substance is introduced, but which is the same anions are monovalent metal ions, through which the polymer can not be activated to form linear chains stretched. Preferably, the addition of the blocking salt until saturation is done to reduce the number of capitalized metal ions with a higher charge.

In the preferred embodiment, is introduced into the aluminum sulfate solution as a blocking substance sodium sulfate to saturation. Advantageously, the addition of the binder to the slurry with intensive mixing of both components in the first contact phase takes place, for which purpose preferably an eccentric screw pump is used, in which the sludge and the binder are jointly introduced in spatially close contact with each other. With the rapid mixing of the binder with the slurry water comes into contact, whereby the saturation of the blocking agent is released and trivalent metal ions to the activation of the polymer can be formed. The intensive mixing under high mechanical mixing performance ensured that the polymer is already finely distributed in the sludge material, before the formation of elongated chains which would hinder the further mixing is completed. the binder is mixed directly into the thick sludge advantageous, neither a pre-dilution of the sludge still of the binder takes place.

The intensive mixing in the first contact phase include in the preferred embodiment further mixing phases, in which the processing material is stirred. Here, there is an increasing addition of water and other components of the sludge to the polymer chains.

Preferably, the processing material runs through a final drying section for the separation of unbound residual water. In particular, in the further mixing stages such water residues facilitate by their lubricating effect the movement of agitators and the promotion of the treatment material.

According to the method described the apparatus for carrying out the process by a reservoir for a binder, a metering device for adding the binder to the slurry, and a mixer means for mixing of the binder is in the sludge.

As already mentioned, the mixing device on an eccentric screw pump for intensive mixing of the sludge and the binder in the first contact stage. This screw pump can be used for suction of aufzubereiteten sludge simultaneously.

For the said further mixing phase, the mixing means of the eccentric screw mixer to downstream components, wherein the mechanical mixing performance of component decreases to component. In these mixer components stirrers are preferably provided for the further circulation of the treatment material, in particular an eccentric screw pump of the processing material promoting vertical mixer is followed with a blade stirring. As the eccentric screw this mixer is not only used for mixing but also to promote the treatment good.

In the preferred embodiment of the invention the mixer with the propeller mixer, a screw conveyor with a conveying screw and mounted on the screw conveyor is arranged downstream of the mixing wings. The intensity of mixing by the mixing blades decreases in the conveying direction by the per unit length foreseen number of mixing blades decreases in the conveying direction.

Finally, the Aufbereitungsvomchtung in its preferred embodiment, the mixing device arranged downstream of apparatus for the separation of unbound residual water, which is formed in particular by a tape transport with a water-permeable tape. a the processing material on the belt-holding upper band can be placed above the water-permeable belt.

Suitably, the separator means comprises a collecting well, communicating with a water cycle in which the deposited, collected in the tub sump water for reuse is supplied.

In a further preferred embodiment of the invention, the device is installed on a vehicle, which facilitates its implementation at different locations.

The invention will now be explained in more detail with reference to an embodiment and the enclosed, relating to this embodiment, drawings and described. Show it:

Fig. 1 is a schematic representation of an inventive device for carrying out the method according to the invention, Fig. 2 shows a detail of the device of Fig. 1 and Fig. 3 a the preparation of a binder explanatory diagram.

By reference numeral 1. 1 denotes a mounted on a mobile support means 2 sludge processing apparatus in FIG. In the mobile carrier device may be one suitable for receiving the sludge treatment device modified commercial vehicles, such as a truck, take action. The Schlαmmαufbereitungsvorrichtung comprises a container 3 for receiving a binder 30, its composition and production will be further explained below with reference to Fig. 3.

The reservoir 3 is connected via a pipe 4 having a pump connection. In the described embodiment is an eccentric screw pump 5 having a maximum capacity of 18 I per hour binder.

Output side, the eccentric screw pump 5 through a conduit 6 communicates with a manifold. 7 At the illustrated separately in Fig. 2 manifold 7, the pipeline unite 6 and a slurry supply pipe 8 in a short connecting line 9 is indicated a further eccentric screw pump 10. As shown in Fig. 1 by a dashed line 1 1, form the eccentric screw pump 5 and the manifold 7 a metering device for supplying a binder to the supplied through the line 8, reprocessed mud.

The mud promotional eccentric screw has low wear duktilbeschichtete function parts and is designed in the embodiment shown mud flow rates from 300 to 1800 I per hour. Via a piping 12 10 is the output side of the eccentric screw pump in conjunction with a mixer 13 which contains an agitator 14 which is driven by an electric motor 15th The agitator 14 has at different heights on four Rührfiϋgel which stir the material in the mixer as well as vertically promote upward. In the described embodiment, the mixer 13 on an inner diameter of 200 mm and a height of 900 mm.

At the upper end an obliquely downwardly inclined feed line 16 is connected on the output side, which ends at a conveyor screw means 17 with a double helix screw 18th The double helix auger 18 is driven by an electric motor 19th In the described embodiment, the inner diameter of the screw conveyor is 17 to 250 mm and its length 1900 mm. Mixing blades 20 are provided on the double helix auger 18, wherein said related to the axial length of the mixing blades number decreases in the conveying direction. In the present case thirty mixing blades and in the second third ten mixing blades are arranged in the first third. The third period is free of mixing blades and intended solely for the promotion. Thus, the auger feeding means fulfilled as the eccentric screw pump 10 and the mixer 13 both a mixer and a conveying function. At the Ausgαngsseite the auger feeding means 17 can pass at 20 conveyed material on a conveyor belt 21st The conveyor belt 21 is formed as a mesh belt and be moved via unshown driving means. Under the conveyor belt 21 a collecting tray 22 for separated from the processing material remaining water is arranged. A terminal 23 on the drip pan 22 is used for recirculating the water collected in a water circuit.

Above the conveyor belt 21, an upper belt 24 is arranged, which ensures that conveyed material is retained on the conveyor belt 21 in front of a lateral slipping.

At 25 passes through the conveyor belt 21 conveyed, recycled material in a suitable container or on a suitable transportation means for removal.

By the reference numeral 26 is a connectable to a source of fresh water Fresh water pump with an attached syringe tubing 27 is designated for the production of a cleaning jet. With the cleaning jet the functional units contained in the sludge processing apparatus 1, in particular the conveyor belts 22, 24 and the auger feeding means 17 can be cleaned.

There will now be described with reference to FIG. 3 for example, the production of a usable in the sludge treatment apparatus of FIG. 1 binder.

Starting materials in the present embodiment, a Ölemuision 28 of a polyacrylamide and an aluminum sulfate solution is 29, which was dissolved in sodium sulphate up to saturation. The emulsified with a mineral oil polyacrylamide is mixed into the aluminum sulfate solution in a short, intensive as possible, the mixing process, the maximum mixing time is only a maximum of 5 seconds, for example.

Depending on the nature of the sludge to be removed for a specific polyamide or a mixture of several polyamides is used. In the present embodiment, a binder is prepared, the accumulating processing at the gravel washing, clay-containing slurries is particularly suitable.

In the following, the operation of the sludge described with reference to FIGS. 1 to 3 will be described treatment apparatus. On the Schlαmmzuführungsleitung 8 is sucked by the eccentric screw pump 10 to be processed sludge. Prior to feeding the slurry into the eccentric screw pump 10, the addition of binder 2, whereby to be processed sludge and binder are not initially mixed, but in the short pipe socket piece 9 of the eccentric screw pump 10 remain separated from each other because of different viscosity, such as with reference to FIG. Visible is.

In the eccentric screw pump 10, a very intensive mixing of sludge and binder, whereby aluminum ions are in contact with the muddy water by dissociation increasingly formed, which activate the polyacrylamide for the connection of sludge water and other slurry ingredients. This activation consists in the fact that the polymer chains are transferred to a stretched, the connection described enabling shape. Prior to mixing that ensures introduced into the aluminum sulfate solution 29 until saturated sodium sulphate ensure that the binder no AI 3+ ions to the premature activation of the polymer chains are available. Upon mixing of sludge and binder of the saturation state is canceled, being ensured by the fast interference that the polymer chains in the processing material are widely distributed before the activation described uses. The formation stretched polymer chains would prevent further mixing. In addition to the activation by stretching the Al 3+ ions promote the accumulation of water and mud components to the polymer chains.

Due to the eccentric screw pump 5, a suitable dosage of the inwardly conveyed from the reservoir 3 binder, whereby the power supplied in the particular embodiment, each tonne of sludge binder amount between 1 and 1, 5 kg. Contrary to the low flow of the binder of the cross section of the conduit 6 is smaller than the cross section of the pipe 8, as shown in FIG. 2.

The material is presented via the pipeline 12 to the mixer 13, in which there is a further circulation of the material to be conveyed by the agitator 15 driven by the motor fourteenth These Rührumwälzung is relatively intense so far, at the same time as a vertical conveyance of the conveyed material is connected in the mixer 13 and must be carried out by promoting the Rührflϋgel against gravity.

In the mixer 13 residues of unbound Schiammwasser advantageously provide for a proper lubrication such that the processing material slide on the inner wall of the mixer and can thus be effected a promotion of the treatment material through the motor 15 with relatively little expenditure of energy. In the mixer 13, the processing material is already so low flowability that a vertical conveyance in the mixer alone with the help of the eccentric screw pump 10 would no longer be possible without the involvement of the blades of the agitator.

Via the supply line 16, the processing material passes under the influence of its gravity to the auger feeding means 17, where it is further mixed during transportation and where unbound residual water is separated from the processing material. From the outlet of the feed screw means 20 in the processing material reaches the sieve conveyor belt 21, wherein the separated water is drained from the processing material and into the collecting tray 22 during the conveyance on the belt path. The upper conveyor belt 24 ensures that the conveyed material is held on the conveyor belt 21st The collected in the tub 22 water can be fed to a water circuit and, for example, be reused for washing gravel.

The processing material delivered at 25 has a puncture-resistant consistency, so that it is landfilled on hillsides. By the type of treatment can be ensured that even when retro-humidification no return sludge formation. The processing material is u in contrast to mud in means of transport for solids such as gravel. the like., transportable.

The device described with reference to FIGS. 1 to 3 can be defined in such a variable in its components, that it can be used for processing different types of sludge.

Claims

claims:
1. A method for treatment of sludge, characterized in that the sludge by mixing a binder (30) under connection of muddy water is solidified.
2. The method according to claim 1, characterized in that the sludge with a polymer preferably, polyacrylamide-containing binder (30) is mixed.
3. The method of claim 1 or 2, characterized in that the polymer for the preparation of the binder (30) is emulsified, and in particular an oil emulsion (28) of the polymer is prepared.
4. The method according to claim 3, characterized in that the emulsion in an activator, preferably a saline solution (29 is mixed with a trivalent metal ion.
5. The method according to any one of claims 1 to 4, characterized in that the activator (28) is added to the premature activation of the polymer before addition of the binder to the slurry limiting blocking substance, preferably in the salt solution (29) as a blocking substance is a salt, is preferably up to saturation, is introduced which forms a monovalent metal ion in the solution.
6. The method according to any one of claims 1 to 5, characterized in that the addition of the binder (30) for sludge with intensive mixing of the binder and sludge in a first contact phase takes place, in particular the mud, and the binder (30) for intensive mixing are fed in this first phase of the processing material contact promotional eccentric screw pump.
7. The method according to claim 6 characterized in that the intense mixing in the first contact stage further mixed phases follow with decreasing mechanical mixing performance.
8. Device for treating sludge, characterized by a reservoir (3) for a binder, a metering device (5-7) for the addition of the binder to the slurry, and a mixer means (10,13,17) for mixing of the binder to the slurry.
9. Device according to claim 8, characterized in that the mixer means (10,13,17) is provided for mixing with the simultaneous promotion of the treatment material, wherein the mixer means (10,13,17) is preferably an eccentric screw pump (10) for intensive mixing of sludge and binder comprises in a first contact phase immediately after the metered addition.
10. The device according to claim 9 characterized in that said mixer means (10,13,17) of the eccentric screw pump (10) downstream of mixer components (13,17) having in the conveying direction of decreasing the mechanical mixing performance.
PCT/EP1999/007559 1998-10-09 1999-10-08 Method for treating sludges and a device for carrying out said method WO2000021893A2 (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
DE19846564.5 1998-10-09
DE1998146564 DE19846564A1 (en) 1998-10-09 1998-10-09 Making wet sludge fit for open site disposal, uses emulsified polyacrylamide

Applications Claiming Priority (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

Publications (3)

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WO2000021893A2 true WO2000021893A2 (en) 2000-04-20
WO2000021893A3 WO2000021893A3 (en) 2000-08-10
WO2000021893A8 WO2000021893A8 (en) 2000-09-28

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PCT/EP1999/007559 WO2000021893A2 (en) 1998-10-09 1999-10-08 Method for treating sludges and a device for carrying out said method

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AU (1) AU6336499A (en)
DE (1) DE19846564A1 (en)
WO (1) WO2000021893A2 (en)

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 (en) * 1989-03-13 1990-09-19 Allied Colloids Limited Treatment of bayer process wastes
WO1996037263A1 (en) * 1995-05-24 1996-11-28 Asset Associates Limited Process for producing products from waste material

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 (en) * 1989-03-13 1990-09-19 Allied Colloids Limited Treatment of bayer process wastes
WO1996037263A1 (en) * 1995-05-24 1996-11-28 Asset Associates Limited Process for producing products from waste material

Also Published As

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

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