EP1019203A2 - Decontamination de sols et de boues souilles - Google Patents

Decontamination de sols et de boues souilles

Info

Publication number
EP1019203A2
EP1019203A2 EP99912960A EP99912960A EP1019203A2 EP 1019203 A2 EP1019203 A2 EP 1019203A2 EP 99912960 A EP99912960 A EP 99912960A EP 99912960 A EP99912960 A EP 99912960A EP 1019203 A2 EP1019203 A2 EP 1019203A2
Authority
EP
European Patent Office
Prior art keywords
sorbent
eluate
water
soil
contaminated
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP99912960A
Other languages
German (de)
English (en)
Inventor
Bertwin Langenecker
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of EP1019203A2 publication Critical patent/EP1019203A2/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B09—DISPOSAL OF SOLID WASTE; RECLAMATION OF CONTAMINATED SOIL
    • B09C—RECLAMATION OF CONTAMINATED SOIL
    • B09C1/00—Reclamation of contaminated soil
    • B09C1/02—Extraction using liquids, e.g. washing, leaching, flotation

Definitions

  • the invention relates to a process for the decontamination of soil of all kinds and sludge contaminated with hazardous waste and petroleum products, the Edreich being washed out with water and subsequently separated from the eluate, so that the volume in which the pollutants are removed from the eluate with a solid adsorbent is reduced withdrawn and then excreted together with the sorbent from the water.
  • the method is characterized in that water is added to the contaminated soil and the mixture is ground, while mechanically induced violent, turbulent currents lower the surface tension of the water and, under the effect of the alternating (pressure) forces, less contaminated larger particles of the soil from the stronger ones Contaminated smaller (fine-grained) are separated, after which in the reduced volume mixture of fine-grained soil and water, the pollutants are separated by means of mechano-chemically activated adsorption on a sorbent and excreted with this.
  • the soil, decontaminated according to the process does not endanger humans or animals and can therefore be used in an environmentally friendly manner and used without restrictions.
  • sludges and soils of all kinds are treated and cleaned of pollutants, so that these substances can be returned to their intended use.
  • the sorbent loaded with the pollutants is separated from the liquid phase of the mixture and disposed of in accordance with the prior art; The separated water is therefore relieved and can be discharged into surface water such as streams, rivers, ponds and lakes or used again in the operational cycle.
  • the invention further relates to devices for carrying out the present method.
  • the washing out of pollutants from contaminated soil is known and is used. Water can mechanically wash down foreign matter from the earth, from gravel and rock; and you can use water as a means of feasting and transport to separate smaller from larger particles and grains. The water is then contaminated with the pollutants from the soil and must be treated accordingly before it can be used again or discharged into water.
  • Chemical additives for washing water when washing material that contains environmentally hazardous pollutants should also be selected and used (WO 98/082; Ansaldo Voelund AS) so that they also have a stabilizing effect. This is to prevent environmentally harmful pollutants from being released during transport and / or when dumping. Corresponding process steps are necessary for this, such as oxidation, thermal treatment (up to 1300 ° C), as well as burning in rotary furnaces. In addition, concreting and covering with fly ash, lime etc. suggested. All in all, the proposed method is extensive, time consuming and costly.
  • the object of the present invention is to make soil remediation more economical and to provide a more efficient method. This is achieved with a method of the type mentioned at the outset if, according to the invention, two effects which have been known in physics and chemistry for more than a hundred years are combined with one another for soil remediation.
  • the present invention also goes far beyond the aims and possibilities of the methods and devices known from the prior art, in that one and the same method for decontaminating soil contaminated with hazardous waste can be used efficiently, even if the substances present in the soil to be decontaminated or sludge, are different in type, quantity and form of their occurrence.
  • One of the two physico-chemical effects used according to the invention results from the reduction of surface tensions in mechanically violently active, turbulent flowing water, the other is due to mechanochemical reactions.
  • the cleaning effect of soap and other detergents is based on the "surface activity", so that the water surface is less stable; the liquid becomes more mobile and more easily penetrates into capillary spaces, e.g. in roughened surfaces of earth, ore and rock; As a result of the reduced surface tension, the "access" of the adsorbing forces (van der Waals forces; unsaturated residual valences of the surface molecules) to foreign substances in water is favored.
  • the surface tension of water can be reduced very much in a purely physical way, even without the addition of soap or the like, by allowing an alternating mechanical field (acoustic, ultrasonic field) to act.
  • an alternating mechanical field acoustic, ultrasonic field
  • Such an alternating field can be generated in various ways, for example with “ultrasound converters”, which convert electrical signals into mechanical vibrations by means of magnetostrictive or piezoelectric components; or purely mechanically in air or liquid flows, for example by pins, rods or balls hitting each other, between which there is earth suspended with water.
  • Mechanochemical reactions are less well known than the effect of reducing surface tensions. While there has been an ancient Chinese method of making vermilion by shaking a mixture of mercury and sulfur for centuries, which is a typical case for mechanochemical synthesis, the first physico-chemical, well-defined explanations of the relationship between mechanical and chemical energy and the Conversion of these two types of energy into each other dates from the middle of the last century. However, they were not given much attention. Mineral transformations due to mechanical-mechanical deformations caused by rock pressure have long been known to geologists. However, while these are long-term processes in nature, mechanochemical reactions in the present process are carried out within seconds, and even in fractions thereof.
  • the description of the process in its entirety should now follow the list and brief description of the processes and technologies applicable to the current state of the art in soil remediation, and the memory of two relevant physico-chemical effects.
  • the process according to the invention comprises several process steps and is only so efficient in its entirety that it provides the decontamination of soil contaminated with hazardous waste, which is required by the environmentally oriented guidelines and regulations for pure soil, sludge, etc. 1 shows the block diagram of the method according to the invention in its entirety.
  • the contaminated soil (sludge or the like) is lifted using devices and devices that correspond to the state of the art (e.g. using a dredger) and introduced (using a conveyor screw or conveyor) into a mixing and grinding system.
  • a dredger e.g., a dredger
  • the mixture is ground up while being kept in turbulent motion, so that the surface tensions decrease and the smaller solid particles separate from the larger solid particles under the prevailing alternating pressure forces. Grinding in the wet process under the superimposed turbulent activity in the mix and regrind can be accomplished with rod or ball mills in tube and drum design.
  • universal mills are suitable, which can be equipped with various grinding tools adapted to the respective tasks.
  • the coarse ground material is separated from the finer material, for example in a sedimentation tank with subsequent dewatering in belt presses or the like.
  • the soil separated from the water can its environmentally friendly determination.
  • the eluate from the (screen belt) press is conveyed into the adsorber with a metering pump and comes into contact with the adsorbent.
  • This adsorbent comes after comminution in a crusher and then grinding to fine powdery particles in a (universal) mill in the same adsorber.
  • Fine grinding creates new large surfaces on the adsorbent, which take full effect in the adsorber by the action of mechanical energy on the mixture of eluate and sorbent, so that the mechanochemical reactions described above are activated.
  • the mechanical energy is exerted on the mixture in a machine that is in principle very similar to the rod or ball mill, in which (in the preceding process step) the mixture of contaminated soil and service water is ground.
  • the two process steps can be carried out in one and the same machine if certain components are adapted or exchanged in each case.
  • the adsorbent is pulverized under protective gas (preferably under nitrogen) to avoid spontaneous combustion and (dust) explosions and to prevent the fresh surfaces of the sorbent from becoming contaminated before the sorbent reaches the adsorber.
  • protective gas can be used to determine the temperature profile in the adsorber by blowing in the gas at a certain temperature.
  • the mechanochemically activated process in the adsorber is followed by the separation of the solid phase from the (service) water, for example in a decanter, so that the relieved water (decontaminated service water) can be discharged into surface or other bodies of water or can be reused when the contaminated soil is rubbed wet .
  • the solid expelled from the decanter consists of the sorbent and the substances extracted from the decontaminated soil; this "hazardous waste" must be sent to the appropriate landfill or treated.
  • the volume of this "hazardous waste” is 1 to 1.5% of the volume of the originally contaminated earth; the present method thus brings a noticeable relief for the landfill problem.
  • the remaining volume to be deposited can be reduced even further if (brown) coal is used as an adsorbent and is burned (in systems equipped with flue gas cleaning). You use the thermal energy of the coal and only need to deposit the ash and the residue from the flue gas filter.
  • the funnel (bunker) is designated, in which the material to be decontaminated (i.e. the soil, sludge, or the like contaminated with hazardous waste and / or petroleum products) is introduced into the treatment plant, removed from here with a screw conveyor (2) and the mixing & grinding machine (3) is supplied.
  • the machine (3) service water is added through the feed line (4), and the mixture that is created with the contaminated material is set in violent, turbulent flows. This reduces the surface tension of the water and promotes the separation of smaller solid particles from the larger ones.
  • the mill (3) was used, which is equipped with a beater disk suitable for large-sized feed materials.
  • the mill (3) has a throughput of ⁇ 4 to / h at 3,000 rpm.
  • rod and ball mills are provided, which require drive powers of up to 1,000 kW in the wet process.
  • the mixture coming from the mixing and grinding machine (3) is left to gravity, then the sediment is discharged for the intended application, and the separation of the solids continues in a belt press (6).
  • the solids can be transported with a conveyor belt (7) into the container (8), which is designed so that it can be lifted hydraulically by an adapted truck and brought into the open air.
  • the poppy seed pump (9) conveys the eluate from the separation process carried out in (5) and (6) into the adsorber (10), which in the exemplary embodiment described here is a machine of the type shown in FIG. 3. For larger throughputs, what has been said about the mixing and grinding machine (3) applies.
  • the eluate meets the sorbent, which, after being crushed in the crusher (11), is introduced into the mill (13) with the screw conveyor (12) and ground there to form powder.
  • the mill (13) is equipped with an eddy current rotor; This grinding tool is particularly well suited for the fine grinding of brown coal to dust with particle sizes from a few micrometers to 0.1 mm. In terms of its design, the mill (13) looks exactly the same as the (universal) mill (3) illustrated in FIG. 3, but it is much smaller than this.
  • the mixture of eluate and sorbent enters the decanter (17), from where the separated solids (usually a sludge with residual moisture) reaches a collecting trough or bunker (19) via the conveyor (18), and can be transported away from there. Since it is the sorbent that is contaminated with the hazardous waste from the earth treated according to the process, this material must be brought to a corresponding landfill; However, the volume of this material is only 1 to 1.5% of the volume of the treated starting substance and thus represents a very considerable relief for the landfill problem, especially since the treatment mentioned above can achieve even smaller residual volumes.
  • the water from the decanter (17), if it complies with the specified quality, can be passed on via the intermediate tank (20) and the drain (21) or via the connections (22) and (4) for recycling in the mixing and grinding machine ( 3) be returned. If necessary, fresh water can be supplied via the connection (23).
  • Mill (13) and adsorber (10) of the system of the exemplary embodiment are installed in a weatherproof container (24) which also contains the control room (25) with the control panel (26) for the operation of the system and at (27) to the electrical one Power grid is connected.
  • the mill (13), adsorber (10) and mixing & grinding machine (13) of the demonstration system are externally identical universal mills of the type shown in FIG. 3. According to their different tasks, they are equipped with different grinding tools.
  • Machine (3) has an impact disk (indicated in FIG. 3)
  • machine (13) has an eddy current rotor
  • adsorber (10) has the grinding tool illustrated in FIGS. 4a and 4b.
  • This grinding tool consists of the stator (28) with the connection (29) to the poppy seed pump (9) filled in FIG. 2, which requires the eluate to the grinding tool, and of the rotor (30).
  • the sorbent comes at (A) from the central inlet opening of the front door (shown open in FIG.
  • the grinding gap is formed by the fins (32) of the rotor and the fins (33) of the stator, the conical arrangement of which is shown in Fig. 4b.
  • (34) denotes that point of the lamella (33) at which the grinding gap opens by the angle (*) in order to prevent the coarser material from entering the narrow grinding gap to facilitate the exit side (B).
  • Kink point (34) and angle (*) are aligned to the consistency of the eluate to be treated.
  • the fins (32) and (33) are designed and mounted with fuses (35) in the grinding tool in such a way that they can be easily replaced if this is expedient or necessary for regrinding or because of the choice of other materials.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Soil Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Processing Of Solid Wastes (AREA)

Abstract

L'invention concerne un procédé et des dispositifs permettant d'appliquer ce procédé en vue de décontaminer divers sols et des boues souillés de déchets toxiques et de produits pétroliers. La terre est lavée avec de l'eau puis séparée du produit élué de telle manière que les substances nocives emportées par le produit élué puissent être extraites par un agent d'adsorption puis éliminées avec l'agent de sorption tandis que la terre purifiée peut être réaffectée à son objet de destination. La figure 2 illustre le principe selon lequel simultanément la terre souillée est introduite via une vis sans fin (2) et l'eau ajoutée pour le lavage est introduite via la conduite (4) dans la machine de mélange et de broyage (3) où le mélange est trituré. Pendant ce temps, les écoulements turbulents violents provoqués mécaniquement réduisent la tension superficielle du mélange et ainsi favorisent le lavage de telle façon que si possible toutes les substances toxiques contenues dans le produit élué qui est ensuite séparé de la terre ou des boues dans le bassin (5) et la presse (6), sont ensuite entraînées jusqu'à l'agent de sorption contenu dans l'adsorbeur (10) où elles sont cédées cet agent de sorption (de préférence solide pulvérulent) sous l'action superposée de réactions activées mécanochimiquement. Le volume restant des substances nocives expulsé dans le bac collecteur (19) par le décanteur (17) représente, avec l'agent de sorption, 1 à 1,5 % du volume initial de terre ou boue purifié selon l'invention et à prélever dans le conteneur (8). Ce volume doit être déposé dans une décharge ou bien revalorisé dans le recyclage des déchets.
EP99912960A 1998-04-09 1999-04-08 Decontamination de sols et de boues souilles Withdrawn EP1019203A2 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
AT0062298A AT406347B (de) 1998-04-09 1998-04-09 Verfahren und vorrichtung zum dekontaminieren von mit gefährlichen abfällen und erdölprodukten verunreinigten erdböden aller art und schlämmen
AT62298 1998-04-09
PCT/AT1999/000090 WO1999052656A2 (fr) 1998-04-09 1999-04-08 Decontamination de sols et de boues souilles

Publications (1)

Publication Number Publication Date
EP1019203A2 true EP1019203A2 (fr) 2000-07-19

Family

ID=3495477

Family Applications (1)

Application Number Title Priority Date Filing Date
EP99912960A Withdrawn EP1019203A2 (fr) 1998-04-09 1999-04-08 Decontamination de sols et de boues souilles

Country Status (3)

Country Link
EP (1) EP1019203A2 (fr)
AT (1) AT406347B (fr)
WO (1) WO1999052656A2 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111375629B (zh) * 2020-03-26 2022-04-19 威海福禄友道生物科技有限公司 一种移动式高效土壤治理用修复车

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
AT378529B (de) * 1983-05-06 1985-08-26 Trimmel Engelbert Dipl Ing Verfahren und vorrichtung zum reinigen von wasser
EP0313116B1 (fr) * 1987-10-22 1993-08-04 Metallgesellschaft Ag Procédé de traitement de sol contaminé
DE3910842A1 (de) * 1989-04-04 1990-10-11 Bru Biorecycling Umwelttechnik Verfahren und vorrichtung zum reinigen von feinteiligem mineralischem gut wie sand oder erdreich von schadstoffen wie oel
ES2071981T3 (es) * 1990-01-29 1995-07-01 Preussag Ag Procedimiento para la eliminacion de aceite de productos solidos con particulas de pequeño tamaño, en particular de residuos de produccion que contienen metales y suelos ensuciados.
DE4004368A1 (de) * 1990-02-13 1991-08-14 Preussag Ag Metall Verfahren zum entfernen von schadstoffen aus erde
WO1996009903A1 (fr) * 1994-09-27 1996-04-04 Hans Huber Gmbh Maschinen- Und Anlagenbau Procede de traitement de sables, de sables fins et d'ardoises grosses, pollues en surface, par exemple par du petrole
DE19523007C2 (de) * 1995-06-24 1998-01-29 Duro Galvanit Chemie Eva M Dil Verfahren zum Reinigen von Schüttgut, insbesondere von Fluß- und Hafensedimenten und Erdreich
DK90796A (da) * 1996-08-28 1998-03-01 Thomas Hoejlund Christensen Metode til udvaskning og kemisk stabilisering af flyveaske, røgrensningsprodukter og andre metalholdige materialer

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
See references of WO9952656A2 *

Also Published As

Publication number Publication date
ATA62298A (de) 1999-09-15
WO1999052656A3 (fr) 2000-01-06
WO1999052656A2 (fr) 1999-10-21
AT406347B (de) 2000-04-25

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