WO1997025281A1 - Procede d'amelioration de l'aptitude au traitement de boues naturelles ou artificielles - Google Patents

Procede d'amelioration de l'aptitude au traitement de boues naturelles ou artificielles Download PDF

Info

Publication number
WO1997025281A1
WO1997025281A1 PCT/EP1997/000045 EP9700045W WO9725281A1 WO 1997025281 A1 WO1997025281 A1 WO 1997025281A1 EP 9700045 W EP9700045 W EP 9700045W WO 9725281 A1 WO9725281 A1 WO 9725281A1
Authority
WO
WIPO (PCT)
Prior art keywords
sludge
dry
water
sewage
content
Prior art date
Application number
PCT/EP1997/000045
Other languages
German (de)
English (en)
Inventor
Jost-Ulrich Kügler
Original Assignee
Kuegler Jost Ulrich
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 Kuegler Jost Ulrich filed Critical Kuegler Jost Ulrich
Publication of WO1997025281A1 publication Critical patent/WO1997025281A1/fr

Links

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
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09B—DISPOSAL OF SOLID WASTE NOT OTHERWISE PROVIDED FOR
    • B09B1/00—Dumping solid waste

Definitions

  • the invention relates to a method for improving the processing properties of natural or artificial sludges for the purpose of their recycling or disposal.
  • sludge is organic soil, and the term sludge serves as a collective term for digested sludge, Mudde, Gyttja, Dy Sapropel. In addition to the definition in DIN 18196, this also includes sewage sludge and water sludge. In addition to these natural sludges, there are artificial sludges, for example oil sludge or chemical sludge. All these sludges have in common that their disposal is becoming increasingly expensive due to the ever more expensive landfill space or is being restricted by legal and other regulations. Oil sludge and chemical sludge, for example, must not be deposited at all, but must be incinerated.
  • a particular problem with the sludge is its manageability.
  • the typical sewage and water sludges are well pumpable, but in this form - if only because of the lack of processability and compactibility - not landfillable. If such sludges are to be incinerated, this requires a correspondingly high energy consumption because of the high water content.
  • sewage and water sludges are subjected to partial drying until, with pulpy to pasty consistency, they have a dry matter content of 15-20% by weight and with kneadable to semi-solid sludges, such as those obtained by sieve drying, a dry matter content of 25-45% by weight.
  • this dry matter content is still too low for economical incineration.
  • Another method is to add hydraulic binders such as lime or cement to the sludge in order to achieve solidification in this way.
  • hydraulic binder causes the material to solidify, which leads to a loss of plasticity and crack formation. dung comes along.
  • Such solidified material is, for example, completely unsuitable for use in landfill seals.
  • the results are very similar when cement is used.
  • organic sludges are unsuitable for landfills, because due to the high proportion of organic substances and the high water content, there is a very high degree of shrinkage, which in turn leads to crack formation.
  • by adding large amounts of lime it is possible to obtain a crumbly or pelletizable material which can be fed to the combustion; however, this has a low calorific value and leads to very high ash levels.
  • the invention thus relates to a method of improving the
  • Processing properties of natural or artificial sludge for the purpose of their use or disposal which is characterized in that dry sludge or water sludge with the sludge a dry matter content of at least 70% by weight (sludge TS> 70).
  • the processing properties of the sludge are one or more of the properties selected from compressibility, viscosity, water absorption capacity, shrinkage behavior, combustion properties and pollutant elution behavior.
  • the dry sludge used according to the invention is sewage or water sludge with a dry matter content of 70% by weight or more (sludge TS> 70).
  • Sludges with a pulpy to pasty consistency usually have a dry matter content of 15 to 20% by weight, which increases to 25 to 45% in the case of kneadable to semi-solid sludges, such as those obtained by sieve drying. With mechanical dewatering, the water content in the sludge can at best be reduced to approx. 50%.
  • thermal drying For further dewatering, since natural drying is too time-consuming, only thermal drying comes into question, whereby flue gas dryers, for example in the form of drum dryers, floor dryers, floating dryers, current dryers or fluidized bed dryers, can be used .
  • flue gas dryers for example in the form of drum dryers, floor dryers, floating dryers, current dryers or fluidized bed dryers.
  • the dry sludge obtained is then in a coarse-grained, crumbly form.
  • thermal drying requires an extraordinarily large amount of energy, which is 1000 kWh for the separation of 1 m 3 of sludge water. Accordingly, thermal drying is economically justified only if the large amount of energy is offset by a corresponding saving in landfill costs or heat recovery.
  • the TS> 70 dry sludge is therefore preferably obtained by thermal drying in drying ovens, in which water is further removed from the previously mechanically dewatered sludge at temperatures of 80 to 130 ° C.
  • the suitability of the dry sludge TS> 70 is given for any type of drying.
  • a soft to pulpy sewage sludge is formed with a dry matter content of 10 to 15% by weight, which is adjusted to a dry matter content of 35 to 45% by weight via centrifuges or chamber filter presses, depending on the amount of lime added. can be brought.
  • the sewage sludge takes on relatively high pH values from 10 to over 11.
  • a neutral sewage sludge is desired, certain polymers can be used as flocculants. Suitable products are commercially available. Even with the use of polymer flocculants, a soft to pulpy sewage sludge mass is obtained, which can be further extracted, for example, by means of chamber filter presses. Even under the most favorable conditions, however, only sewage sludge with a dry matter content of around 50% can be obtained. In contrast, the treatment of the sewage sludge with conventional centrifuges leads to a sewage sludge with a dry substance content of only 33 to 40%.
  • dry sludge TS> 70 used according to the invention, it is initially of no importance from which sewage sludge (untreated or conditioned with flocculants) it was obtained. However, the previous history of the dry sewage sludge TS> 70 is important for certain applications. If, for example, a use for the production of floor sealing layers is envisaged, a dry sludge TS> 70 is preferably used, which was obtained not from a lime-conditioned but from a sludge conditioned by means of polymer flocculant.
  • lime-free sludge has a higher calorific value and a lower ash content.
  • Dry sludge TS ⁇ 70 obtained from lime-conditioned wet sludge is desirable if e.g. highly contaminated wet sludge should be deposited in compressed form without further biological activities.
  • a higher pH value is advantageous here, which can be increased by adding water glass.
  • the dry matter content of the dry sludge is at least 70% by weight, ie the maximum water content is 30% by weight.
  • the dry matter content is at least 70% by weight, ie the maximum water content is 30% by weight.
  • thermal drying drying to TS 90 is common for subsequent combustion.
  • complete water removal is too energy-intensive and is therefore not desirable for economic reasons alone.
  • the re-drying effect of the dry sludge, preferably in ground form is greater, the greater its dry matter content or the smaller its water content.
  • the residual water content of the dry sludge should be as low as possible, for example below 20% or below 10%, good results having been obtained with dry sludge TS 80 and in particular TS 90.
  • the usual sewage and water sludges come into question as sources for the dry sludge. Sewage sludge is not bacteriologically stable, especially if it is not fully decayed, and one should fear a greater shrinkage as a result of the decomposition of the organic material and thus an impairment of the landfill seal. Surprisingly, however, it has been shown that increased shrinkage does not occur. On the contrary, a reduction in shrinkage due to the addition of dry sludge is even observed. This favorable influence on the shrinkage behavior, which is so important for the sealing effect, cannot be observed when wet sludges are added, as is demonstrated by the comparative examples.
  • the dry sludge TS> 70 used according to the invention is obtained by thermal drying of ScUarnm, preferably sewage or water sludge, and is then in a coarse-grained, crumbly form.
  • This material is preferably subjected to grinding in such a way that the grain size is less than 0.6 mm.
  • care is preferably taken to ensure that a significant proportion have a grain size below 0.06 mm, for example at least 15% by weight or at least 50% by weight.
  • EP-B-0 338 039 A method is known from EP-B-0 338 039 in which fine-grained artificial soil mixtures, such as sewage sludge, are processed by adding dry granular aggregates, such as incineration ash, dusts or dried recycling sands, into a compactable and sealing-sealed installation mixture can be. These sealing mixtures then behave like cohesive soil layers, for example silt or clay.
  • the process of EP-B 0 338 039 is subject to certain restrictions. When exposed to rain, the sealing compounds have a soft consistency and are mechanical nically no longer processable. The same applies if, for example, earth-moist aggregates are mixed into the sewage sludge.
  • sewage sludge with kneadable to semi-solid consistency obtained by sieve drying which has a water content of about 60 to 70% by weight, that is to say a dry matter content of only 40 to 30% by weight. (Sludge TS 40 or 30).
  • the waterproofing mixes had a medium-plastic shape and gave waterproofing effects with kf values in the range of 1 x 10 "10 m / s.
  • Dry sludge TS> 70 is possible, artificial soil mixtures with a very high organic content (this is 40 to 50% for sewage and water sludge) and high water content even after never to make the impact impact processable with large-scale earthwork measures. Until now, this was only possible with drying measures (sun, wind or even drying oven). In addition, this is the first time that it is possible to produce plastically deformable sealing layers which subsequently no longer soften due to the influence of weather or water build-up.
  • Table I shows the starting soil mixtures with the associated mixed water content, the shrinkage values before and after the addition of dry sludge TS 90 and the sealing values achieved (kf values) before and after the addition of dry sludge TS 90.
  • powdered water glass (20 kg / m 3 ) was added to the soil mixture.
  • Ground dry sludge TS 90 with a grain fraction ⁇ 0.06 mm of 20% was used.
  • the amount of TS 90 dry sludge added was chosen in all cases so that the floors were easy to roll and install for the construction site.
  • the amount of dry sludge TS 90 added was 20 kg / t in test 1, 32 kg / t in test 2 and 54 kg / t in test 3.
  • the density of the compacted soil mixtures should be set at 1.45 t / m 3 . Zen.
  • the organic proportion of the ground dry sludge TS 90 was approx. 40%.
  • the mixed water content given in Table I is not based on the total amount of the moist soil mixture, but on soil dry matter.
  • a sample mixture with a mixed water content of 39% thus contains 390 g of water per 1000 g of dry soil. This corresponds to a water content, based on a total of 28.1%.
  • Table I initially confirms the expected facts, namely that an increase in the water content leads to increasing shrinkage values (tests 1 and 2).
  • Table I also shows that an increase in organic constituents with the same water content likewise results in a very substantial increase in the shrinkage values (tests 2 and 3).
  • Table I also provides the extremely surprising finding that the shrinkage values can be drastically reduced by adding dry sludge TS 90, even though the proportion of organic substances in the soil mixture is further increased by adding dry sludge TS 90.
  • the engineering significance of this surprising finding lies in the fact that the shrinkage values obtained according to Table I with the addition of dry sludge TS 90 are about half less than the shrinkage values of natural silt soils and even 3 to 4 times less than with clay soils.
  • an improved sealing effect is achieved by adding to the sewage sludge-containing (TS 30/40) sealing mixture in addition to the dry sludge TS> 70 water glass, preferably in powder form, in such an amount that in the soil water of the sealing mixture results in a 3 to 10% by weight water glass solution.
  • Another preferred method of operation here is to mix the powdered water glass together with the dry sludge in a single operation with the sealing mixture.
  • bindery here means a finely divided dry form, including flake, etc.
  • suitable water glass are sodium and potassium water glasses, with sodium water glasses being preferred because of their low cost.
  • a particularly suitable commercial product is available under the name Deposil N.
  • soft gel formers are used in addition to the water glass in the manufacture of seals. The use of such soft gel formers is known per se.
  • suitable soft gel formers are sodium aluminate, sodium hydrogen carbonate, sodium acetate and sodium hydrogen phosphate.
  • Sodium hydrogen carbonate (a suitable product is commercially available under the name Deposil V) is preferred because environmental concerns may arise against phosphates and acetates. In some cases, however, mixtures of the soft gel formers are also used.
  • the soft gel former is used in powder form, generally in an amount of 1 to 10% by weight, based on the amount of free soil water, preferably in an amount of 2 to 8% by weight and in particular 3 to 6% by weight.
  • powder form generally in an amount of 1 to 10% by weight, based on the amount of free soil water, preferably in an amount of 2 to 8% by weight and in particular 3 to 6% by weight.
  • the expression “powdery” here means a finely divided dry form, including flake, etc.
  • the task was to dispose of a radiation-contaminated sewage sludge from a sewage pond with a water content of 148.2% (TS 40.3).
  • TS 40.3 water content of 148.2%
  • the mixture was additionally Glass powder was added in such an amount that a pH value above 12 was obtained (the amount added was 50 kg water glass powder / t, since lime-conditioned sewage sludge with a pH value of 11 was used). This prevented any biological activity. This was checked on a compressed sewage sludge body (diameter 9.5 cm, height 10 cm, volume 708 ml) in a closed permeability measuring device with which the resulting soil gas mixtures could also be collected. After 7 days the k f value was determined to be 1.4 x 10 "10 m / s.
  • sludges such as sewage or water sludge, oil sludge and chemical see calling sludge.
  • sludges such as sewage or water sludge, oil sludge and chemical see calling sludge.
  • examples of the latter are colored sludge or distillation residues.
  • These can be sludges with an aqueous phase, an organic phase or with a mixed phase.
  • a special property of the sludge according to the invention mixed with dry sludge TS> 70 is that they have a greater retention capacity for organic pollutants and heavy metals. In other words, these pollutants are eluted to a lesser extent by rainwater. Trough tests showed eluate reductions of more than 90% after 3 to 4 days. When such substances are deposited in secured landfills, there is far less fear of impairment of the protected goods water, soil and air.
  • dry sludge TS> 70 used according to the invention for the treatment of this sludge is in this case preferably obtained from those sludges (sewage sludge, water sludge) which are themselves intended for combustion.
  • the combustion of such sludge costs from DM 300 to DM 600 per ton. These costs can be almost completely saved if dry sludge TS> 70 is produced from it and this is then used for the preparation of other sludge for the disposal of combustion.
  • the method of the invention opens up a further interesting area of application for chemical sludges, which can often only be burned in incineration plants which have been specially approved and set up for this purpose.
  • Tests with distillation residues have shown that these can be converted into a solid, compactable consistency by adding dry sludge TS> 70, this material then being able to be fed to a solid incineration plant.
  • Solvent-containing liquid paint residues require approximately 75 to 100% by weight of dry sludge TS 90 in order to transfer the liquid into a puncture-proof body in preparation for combustion.

Landscapes

  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Treatment Of Sludge (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

L'invention concerne un procédé permettant d'améliorer l'aptitude au traitement de boues naturelles ou artificielles pour leur utilisation ou élimination ultérieures. Selon ce procédé, des boues de décantation ou d'eaux usées sèches ayant une teneur en substance sèche de 70 % en poids sont ajoutées aux boues.
PCT/EP1997/000045 1996-01-08 1997-01-08 Procede d'amelioration de l'aptitude au traitement de boues naturelles ou artificielles WO1997025281A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE1996100412 DE19600412B4 (de) 1996-01-08 1996-01-08 Verfahren zur Herstellung von verdichtbaren Materialgemischen aus natürlichen oder künstlichen Schlammen
DE19600412.8 1996-01-08

Publications (1)

Publication Number Publication Date
WO1997025281A1 true WO1997025281A1 (fr) 1997-07-17

Family

ID=7782297

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP1997/000045 WO1997025281A1 (fr) 1996-01-08 1997-01-08 Procede d'amelioration de l'aptitude au traitement de boues naturelles ou artificielles

Country Status (2)

Country Link
DE (1) DE19600412B4 (fr)
WO (1) WO1997025281A1 (fr)

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE10117902A1 (de) * 2001-04-10 2002-10-31 Bickhardt Bau Ag Verfahren zur Herstellung eines Dichtungssystems aus gemischt- oder feinkörnigen Böden, Klärschlamm, Glasschleifschlamm oder Keramikschlamm, Gießereialtsand und Wasserglas zur Abdichtung von Erdoberflächen gegen das Eindringen von Oberflächenwasser sowie das Austreten von Schadstoffen aus den Schichten unterhalb des Dichtungssystems
DE102014107969A1 (de) * 2014-06-05 2015-12-17 EnBW Energie Baden-Württemberg AG Verfahren zur Behandlung einer feuchten, heizwertarmen Masse

Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62171800A (ja) * 1986-01-22 1987-07-28 Hitachi Metals Ltd 汚泥の脱水方法
JPS63111999A (ja) * 1986-10-31 1988-05-17 Mitsubishi Heavy Ind Ltd ドライクリ−ナ蒸溜スラツジの固形化処理方法
WO1994029229A1 (fr) * 1993-06-03 1994-12-22 Volume Reduction Systems, Inc. Preparation de matieres solides a ecoulement libre, a partir de dechets contenant de l'eau

Family Cites Families (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2634220B2 (ja) * 1987-08-20 1997-07-23 キュクラー，ヨスト‐ウルリヒ 特に堆積処分場造成のための水密土層形成方法
DE4138036C2 (de) * 1991-11-19 1999-07-08 Rothemuehle Brandt Kritzler Verfahren und Vorrichtung zur Behandlung eines zu einem Dickschlamm entwässerten Klärschlammes

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS62171800A (ja) * 1986-01-22 1987-07-28 Hitachi Metals Ltd 汚泥の脱水方法
JPS63111999A (ja) * 1986-10-31 1988-05-17 Mitsubishi Heavy Ind Ltd ドライクリ−ナ蒸溜スラツジの固形化処理方法
WO1994029229A1 (fr) * 1993-06-03 1994-12-22 Volume Reduction Systems, Inc. Preparation de matieres solides a ecoulement libre, a partir de dechets contenant de l'eau

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 012, no. 015 (C - 469) 16 January 1988 (1988-01-16) *
PATENT ABSTRACTS OF JAPAN vol. 012, no. 353 (C - 530) 21 September 1988 (1988-09-21) *

Also Published As

Publication number Publication date
DE19600412A1 (de) 1997-07-17
DE19600412B4 (de) 2004-06-24

Similar Documents

Publication Publication Date Title
WO2008095714A1 (fr) Produit de mélange
EP0702110B1 (fr) Procédé pour étancher des couches de sol
EP0338039B1 (fr) Procede pour etancher des couches de sol, notamment pour creer des decharges de dechets
DE69732434T2 (de) Verfahren zur kaltumwandlung von stadtmüll und/oder schlamm in inerten materialien, anlage zur durchführen des verfahrens und so erhaltene produkte
DD283342A5 (de) Verfahren zur umformung von abfaellen in einen werkstoff in form von kuegelchen
EP1586621B1 (fr) Procédé de gazéification de matière carbonée en gaz de synthèse
DE19540387A1 (de) Bentonitgebundene Gießereialtsande in Dichtungssystemen des Deponiebaus sowie Absicherung von Altlastenstandorten und Verfahren zur Herstellung, Aufbereitung und Einbau dieser
WO1997025281A1 (fr) Procede d'amelioration de l'aptitude au traitement de boues naturelles ou artificielles
DE4417012C3 (de) Verfahren zum Aufbereiten von Klärschlamm und Verwendung des Endprodukts
DE4206900A1 (de) Verfahren zur aufbereitung von schlamm
EP2468955B1 (fr) Procédé de realisation d'une couche de support
DE3727978A1 (de) Verfahren zum abdichten von bodenformationen, insbesondere zur herstellung von deponien
EP0518206A1 (fr) Méthode pour traiter et consolider les poussières de filtrage et/ou les produits de réaction
DE19707036C2 (de) Verfahren zum Aufbereiten von Rohschlämmen
EP3573931A1 (fr) Procédé de fabrication d'un liant de conditionnement de boues, de sols aqueux ainsi que de neutralisation d'acides
DE4225886B4 (de) Zusatzstoffe und Verfahren zur Entwässerung und/oder Verfestigung von Schlämmen
CH688990A5 (de) Aufbereitung organischer und anorganischer Reststoffe aus rekonstruierten Altdeponien und/oder Frischmuell zu einem wiedervertbaren Stoff unter Schadstoffverfrachtung.
EP0343154B1 (fr) Utilisation de particules fines minérales de silicate/carbonate pour le dépôt ordonné de déchets
DE19827540B4 (de) Verfahren zur Verwertung von heizwertarmen Fraktionen aus der Haus- und Gewerbeabfallaufbereitung
DE4335746C2 (de) Verfahren und Vorrichtung zur Entsorgung von Klärschlamm
DE69613149T2 (de) Verfahren zur verwertung von hausmüllverbrennungsrückständen und von abwasserkläranlagenschlammverbrennungsaschen und dren gemischen
EP0530548A1 (fr) Méthode pour transferer les résidus d'installation d'incinération en forme solide et aptes à être mis à la décharge
DE4335745C2 (de) Mit Nährelementen beladener Körper zur Ausbringung in Böden
EP0649826A1 (fr) Procédé et appareil pour l'élimination des boues
EP0338438A1 (fr) Procédé de traitement ou de réutilisation d'argile ou de masses argileuses, procédé de neutralisation de substances nuisibles à l'aide d'argile ou de masses argileuses et étanchéification ou revêtement de dépôts de déchets à l'aide d'argile ou de masses argileuses

Legal Events

Date Code Title Description
AK Designated states

Kind code of ref document: A1

Designated state(s): US

AL Designated countries for regional patents

Kind code of ref document: A1

Designated state(s): AT BE CH DE DK ES FI FR GB GR IE IT LU MC NL PT SE

DFPE Request for preliminary examination filed prior to expiration of 19th month from priority date (pct application filed before 20040101)
121 Ep: the epo has been informed by wipo that ep was designated in this application
122 Ep: pct application non-entry in european phase