EP0758275A1

EP0758275A1 - Soil decontamination facility

Info

Publication number: EP0758275A1
Application number: EP95918615A
Authority: EP
Inventors: Reinhold Straus; Reinhard Eisermann; Christoph Hohlweck
Original assignee: Lobbe Xenex GmbH and Co
Current assignee: Lobbe Xenex GmbH and Co
Priority date: 1994-04-30
Filing date: 1995-04-27
Publication date: 1997-02-19
Also published as: WO1995029773A1; DE4415230C1

Abstract

A facility for biological recultivation treatment of contaminated soil can be operated as a mobile or a stationary system. The soil to be treated is spread out on a bed (90). Extending out over this soil is a travelling device which has a drive unit and to which is mounted a soil cultivation device, optionally in the form of a vertical rotary cutter (40). The facility (1) is circular in design and has at its center (2) a column (10) that serves at least as central supply unit and guide for the travelling device. The central column is anchored in a stabilizer base (20). The travelling device has an outrigger (30) which at one end is rotatively mounted to the central column (10), extends out over the soil (6) to be treated and at its other end has a travelling mechanism (70) with the drive unit (74).

Description

Soil decontamination plant

Description:

The invention relates to a plant for the biological recultivation treatment of contaminated soil with a base on which the soil to be treated is spread, and with at least one movable device which extends over the soil and has a drive device and on which at least one tillage device is arranged.

Decontamination systems of this type are known in the form of rectangular halls in which a gantry crane with soil cultivation devices is installed. With the gantry cranes, however, a relatively complex control is required in order to prevent the trolley frame from tilting when the gantry crane is moving. By moving the heavy tillage equipment back and forth during the treatment of the soil to be decontaminated, different loads are placed on the rollers and bearings on the rails of the gantry crane. This has a considerable influence on the drive, which must be designed and controlled accordingly.

Furthermore, DE 37 30 833 AI discloses a method and a plant for the biological recultivation treatment of contaminated soil. The soil to be treated is spread out on a base plate, above which a treatment trolley with devices for supplying water, Microorganisms and nutrients is provided. This treatment trolley extends like a bridge across the width of the base plate and has a chassis on each side that runs on guides provided on the lateral edges of the base plate. The treatment trolley is equipped with appropriate feed devices and devices for mechanical processing of the soil, such as a tiller or a plow. The entire system is covered with a film-like wall, which can be partially or completely removed.

The object of the invention is a plant for the decontamination of soil, which avoids the disadvantages of rectangular decontamination centers and allows fully automatic operation.

This object is achieved with a system which is circular and has a center column in the center, which is designed at least as a central supply device and as a guide for the movable device. The system works according to the circulation principle, whereby the processing of the contaminated soil is carried out in a circle around a central point. The center column is preferably also designed as a central supply device, for example for the tillage implements.

The center column preferably has a tube which is fastened in a support foot. The support foot can be cast from concrete and, according to a preferred embodiment, is designed as a trough with a bottom and peripheral wall. The diameter and weight of the support leg are designed so that the center column has sufficient stability depending on the size of the decontamination system. The support foot can be connected to the base on which the soil to be decontaminated is spread, or can only rest on the ground. It is therefore possible to use the center column as a component _{n ^} „ _^ -, _Λ

PCT / EP95 / 01598

use a mobile system that can be removed after the soil has been prepared and set up elsewhere.

Additional devices can be provided in the interior of the support foot or the support foot can be designed as a water collecting basin. In order to achieve the largest possible collection volume, the support leg can also be embedded in the ground, which also increases the stability of the center column.

The movable device preferably has at least one carrier, which is mounted at the end of the center pillar, extends over the soil to be treated, and has a chassis with an associated drive device at the other end. A trolley is arranged on the carrier and carries at least one tillage implement. Trolley and soil tillage implement each have their own drive device. In operation, the carrier rotates around the center column and the trolley with the soil cultivation device (s) can be adjusted along the carrier regardless of the rotation of the carrier, so that it is possible to run different soil cultivation programs. The soil can be prepared along a spiral path if the soil tillage implement is continuously moved in the radial direction while the carrier rotates. It is also possible to process circular sectors or circular rings of any size, depending on the amount of soil to be treated, the fill and the type of decontamination of the soil and the type of treatment to be selected.

The energy supply for the drive devices can take place via the center column and the support. Depending on which drive the mobile device or the soil tillage implement has, the energy supply consists of cables for electric current or hoses for fuels, whereby these supply lines can be laid on the carrier or in the carrier. Due to the central feed via the center column, there are no complex ones Tracking devices required, as is the case with conventional floor decontamination systems. There is also the possibility of providing storage containers on a console on the center column, which are moved around the center column while the carrier rotates.

The carrier is preferably mounted on the center column so as to be pivotable about a horizontal axis, which is particularly advantageous in mobile systems because the center column and carrier can be aligned in parallel and transported on a truck.

Conventional equipment can be used as soil tillage equipment. Vertical tilling and / or chain milling and / or a horizontal milling machine and / or dozer blades that are independent of the direction of rotation and which are arranged on the trolley so as to be adjustable in height in order to be able to adjust to different soil depths are preferably used as tillage devices. The closer the soil tillage implement approaches the outer circle of rotation, the greater the forces acting on the undercarriage, as required. The undercarriage can have one or two wheels, which depends on the torsional rigidity of the carrier and also on the length of the carrier.

The dozer blade is preferably arranged behind the soil tillage implement in the direction of travel so that the soil can be leveled immediately after loosening. It also better distributes the load on the beam. By pivoting the dozer blade, there is still the possibility of causing a simultaneous lateral shift of the soil to be decontaminated in relation to the work movement. The dozer can continue to provide feed and digging services when loading the system so that it is not necessary for a loading vehicle to enter the system. The tillage devices are preferably equipped with a device for supplying water, microorganisms and nutrient suspensions. Corresponding storage containers can be transported on the carrier or arranged on the center column. There is also the possibility of connecting the corresponding feed devices on the soil tillage implement to storage containers installed outside the system via corresponding feed lines which are laid on or in the support and via corresponding lines in the center column.

In order to create reactor-like conditions, the entire system can be covered, and the roof can be equipped with solar cells. The roof of the entire system can consist of individual elements, which is particularly advantageous for mobile systems. The canopy is preferably inclined towards the central column in order to be able to collect rainwater. The tube of the central column is preferably double-walled with inner and outer tubes for this application, so that the rainwater can be directed downward into the support foot, which is designed as a water collecting basin, via the annular space between the inner and outer tubes. Exhaust gases can then continue to be discharged to the outside through the inner tube. In this embodiment, the decontamination system also has its own water supply, which is particularly important for mobile systems.

The water collected in the support leg designed as a container can be removed via a tank pipe to which a pump is connected. A further inner container for nutrient solutions, for example, is preferably located in the support foot, into which a tank pipe connected to a pump is also immersed. By adjusting the pump, any mixing ratio of the nutrient solution can be set, which is then fed to the soil tillage implement. If the drive devices of the undercarriage and the tillage implements consist of internal combustion engines, the exhaust gases can be discharged via the carrier, which is designed as a hollow body, and via the tube of the center column. Due to the long distance to be covered and the large surface area of the components flowing through, heat is given off to the surrounding space, which additionally improves the degradation rate due to the microorganisms introduced. Due to this simple exhaust gas discharge, no additional exhaust air devices are required in the interior of the system.

The internal combustion engines can be designed so that they suck in the contaminated air within the decontamination center and decontaminate the air by combustion, so that a separate filter device is not required. Since fresh air constantly flows in from the outside due to the air extracted from the interior, the interior air is renewed in this way.

The surface on which the soil to be decontaminated is spread can consist of a plastic film, in particular polyethylene, and a layer of sand applied to it in a mobile system. In such a mobile system, the chassis rotates on the leveled surface outside the plastic film. Since in the area of the outer edge of the system, tillage is always associated with a certain ^' soil movement ^' , part of the decontaminating soil could leave the intended circular area and possibly hinder the running gear during the rotation. For this purpose, a mouldboard is provided on the undercarriage, which is inclined obliquely inwards and causes a conical embankment in the edge area with each revolution. Material falling over the bed profile or thrown out by the soil cultivating device can be picked up by an additional baffle and can be moved over the mouldboard to slope the organic bed be directed above. Material left over from the embankment is picked up by the dozer blade pointing inwards after the edge of the embankment and transported towards the center.

In the case of stationary systems, a stable base wall is preferably provided, which can consist of a cast base plate or of composite base wall elements. At the outer edge of the system, the bottom wall can have a circumferential, vertical boundary wall, so that no mouldboard is required on the chassis. The boundary wall can continue as an outer wall above the running surface until the roof begins. So that the interior of the system can be driven on by a loading vehicle, the boundary wall has at least one gate.

The undercarriage can be designed particularly simply if the boundary wall has a running surface for the undercarriage.

The bottom wall elements preferably have spacer elements on their underside, so that a cavity remains under the bottom wall elements through which, for example, warm air can be passed in order to accelerate the decontamination process of the soil stored on the bottom wall elements. In addition, supply and discharge lines can be laid in these cavities, which for example connect storage containers outside the system to the center column. The spacer elements are preferably support ribs extending in the radial direction, so that radially aligned flow channels can be formed under the bottom wall. These flow or air channels are preferably connected to the interior of the support foot, in which circulation fans and / or heat exchangers are arranged.

If further heat exchangers are arranged in the tube of the center column, the hot exhaust gases can be used to heat the air to be circulated and thus can be used to heat the bottom wall. In addition, heating pipes can be laid in the floor wall or under the floor wall.

Exemplary embodiments are explained in more detail below with reference to the drawings.

Show it:

FIG. 1 shows a vertical section through the floor decontamination system,

FIGS. 2 to 5 each show a vertical section through a floor decontamination system according to further embodiments, FIG. 4b showing the schematic representation of an awning,

FIG. 6 shows a top view of a soil decontamination plant,

Figures 7, 8, 9

Detailed views of the chassis according to various embodiments,

FIG. 10 carrier and trolley on average with tillage equipment in a side view,

Figure 11 is a plan view of a section of a

Soil decontamination plant,

Figure 12 is a plan view of a floor decontamination plant according to another embodiment and Figure 13 Carrier and trolley on average with a dozer blade.

The left part of a soil decontamination system 1 is shown in section in FIG. It is a mobile system that can be dismantled after the end of soil decontamination and can be reassembled elsewhere. The soil 6 to be decontaminated is spread out on a base 90, which consists of a plastic film 91 and a layer of sand 92. In the center 2 of the system 1 there is a center column 10, which serves for supply and disposal as well as for guiding the movable device.

The center column 10 has a tube 11 to which a central roof 114 is fastened at the upper end, on which the roof struts 112 of the roof 110 are pivotably mounted at the articulation point 115. The roof struts 112 are supported by supports 113 on the outer edge of the system. The round roof is covered with a tent skin 111, which can be opened at various points between the supports 113 for the purpose of accessibility during loading and unloading.

The tube 11 is fastened at the lower end in a support soot 20 which has a bottom wall 21 and a peripheral wall 22. The support foot can be made of concrete, for example, so that it has a sufficiently large weight, especially since the support foot in the illustration shown here only rests on the ground.

On the center column 10, the support 30 is pivotally mounted about the axis 16 by means of the rotary bearing 14. The carrier 30 extends over the soil 6 to be decontaminated, which can be heaped up, for example, 1 m thick, and has a chassis 70 at the other end which has one or two wheels 71 on a frame 73 which is fastened to the carrier 30. 72 wears. If, as shown in FIG. 8, only one wheel 71 is provided, the carrier is 10

30 torsionally rigid and correspondingly mounted on the pivot bearing 14. Greater stability is achieved if two wheels 71, 72 are provided as shown in FIG. 9. FIGS. 8 and 9 additionally show a mouldboard 80 with a baffle 81, which is fastened to the carrier 30 in addition to the tillage implement 40. The mouldboard 80 is inclined towards the center pillar and, during the rotation of the carrier, causes an embankment to be filled up. The dozer blade 55 arranged behind the mouldboard in the direction of travel provides for the surface leveling.

The wheels 71, 72 run outside of the plastic film 91 provided as a vertical barrier on the leveled ground. Depending on the drive device 74, a fuel tank or a power generator 75 can be provided on the frame 73. If hydraulic wheels are used, the drive device 74 consists of a pump for the hydraulic fluid. In addition, the mouldboard 80 is attached to the frame 73, which - as described in connection with FIGS. 8 and 9 - has the task of preventing the floor to be decontaminated from migrating into the tread area of the undercarriage 70.

A trolley 31 with a drive device 38 is arranged on the carrier 30, to which a soil cultivation device in the form of a vertical milling machine 40 is attached, which has its own drive device 41. The vertical milling machine 40 has a hollow shaft 43 with spray nozzles 64 (see FIG. 10), through which nutrient solutions and microorganisms can be introduced into the soil 6 to be decontaminated. The spray nozzles 64 are part of a feed device which is fed via a tank 62 which is either attached to the frame 73 or is arranged on the center column 10. In the case of a tank arranged on the frame 73, the feed line takes place via the feed line 61. If the drive devices 38 and 41 are hydraulic motors, these can be driven via the pumps arranged on the frame 73, which are connected to the hydraulic motors via the hydraulic oil supply line 42. The possibly occurring exhaust gases from the drive devices can be conducted via the carrier 30 designed as a hollow body to the center column 10, where they are fed to the interior of the tube 11 via the exhaust manifold 15 and the rotary union 13. At the upper end of the tube 11, the exhaust gases can be discharged to the outside.

The floor decontamination system 1 shown in FIG. 1 is designed with the dimensions and weights of the components so that it can be transported on the road with suitable vehicles without a special permit.

Another embodiment is shown in FIG. 2, which differs from the embodiment shown in FIG. 1 in that a concrete bottom wall 95 is provided. This has a boundary wall 93a on the outer edge 3 of the system, so that a mouldboard 80 is no longer required to fill an embankment on the support 30. In this stationary system, the support foot 20 can be concreted into the bottom wall 95.

The exhaust air produced by the soil 6 to be decontaminated is cleaned by an activated carbon filter 4, which is installed outside the system 1. This has a heat exchanger which is intended to ensure that an energy balance takes place between the air supplied and the air removed. To ensure total self-sufficiency, a suitable generator 5 is provided for driving the filter fan and for lighting.

A further embodiment is shown in FIG. 3, which can also be used as a mobile system. The bottom wall 95 consists of individual bottom wall elements 96, 97, as can be seen from FIG. 11, which shows a plan view of a section of the system 1. The bottom wall elements 96, 97 are designed as circular sector elements or as parts of circular sectors and have on their underside spacing ribs 98 which extend in a radial clearance. The spacer ribs 98 are arranged in such a way that flow channels are formed through which heated air on the underside of the 'bottom wall 95 can be passed. The heated air is supplied from the center column to the cavities 100 under the inner bottom wall elements 96 and from there to the adjacent outer bottom wall elements 97, the spacing ribs of which have connecting openings in the outer edge region, so that the air can flow into the cavity 100 under the respectively adjacent bottom wall element 97 . From there, the air is fed back under the bottom wall elements 96 to the center column 10, where circulating air fans 24 ensure a continuous air flow.

As shown in FIG. 3, the air inside the support foot 20, which is closed by a removable cover wall 23, is passed through a heat exchanger 25, which is designed as a water-air heat exchanger. In the peripheral wall 22 are openings 150, via which a connection between the cavities 100 under the bottom wall elements 96 and the interior of the support foot 20 is made. The circulating air blowers 24, which suck in the air and feed it to the heat exchanger 25, are arranged in the lower annular chamber 151. From there, the heated air enters the upper annular chamber 152 and from there into the outlet duct 153. The openings 150 can be closed by throttle valves (not shown), so that individual fields of the system can be operated at different temperatures. The heat exchanger 25 is connected to a flow heater 18 installed on the outside of the tube 11 and a further heat exchanger 19 which is arranged in the interior of the tube 11 of the center column 10. The hot water flowing to the heat exchanger 25 is heated on the one hand by the continuous-flow heater 18 and on the other hand by heat coupling from the exhaust gases of the drive motor of the generator using the air-water heat exchanger 19 in the tube 11 or the exhaust air duct located therein. A pump 8 is provided in the water circuit for the circulation of the water between the two heat exchangers 19 and 25.

The boundary wall 93a has a tread 94 on which the drive wheel 71 of the carrier 30 rests. A complex chassis is therefore not necessary in this embodiment.

The vertical milling machine 40 is supplied with energy by the power generator 27 via the trailing line 32 attached to the carrier 30. A power generator 27 is arranged on a bracket 17 fastened to the rotary bearing 14 and supplies the blowers 24 and the instantaneous water heater 18 with power via the rotary feedthrough 28. Furthermore, a storage tank 26 is provided on the console 17, for example for nutrient suspensions.

Another variant of the roof 110 is shown in FIG. 4a. The plastic roof 116 is provided with an additional insulating layer in segment construction, so that even in winter, reactor-like conditions can be created with relatively little energy expenditure. Such a plastic roof 116 is suspended in the center roof 114 in the receptacle 117 and secured with the element 118.

In this system 3, the infrastructural part is largely relocated to the outside in a container or an early period 123, which is shown in FIG. 4b.

The heat and energy supply is based on a generator with combined heat and power 125. From here, the electrical energy is supplied by means of the power line 120, which first passes through the control unit 160 and also the corresponding control lines, supplied to the circulating air system in the support leg 20 already described in connection with FIG. 4a.

From there, line 120 continues, first passes through sliding contacts 170 and finally reaches electrical distribution 171, which is also housed on console 17.

From here, the soil tillage implement is supplied via line 32.

The hot water supply to the circulating air system comes about because the unit 125 is able to about 1, 25 times its electrical energy in the form of heating water. This hot water is circulated with the aid of the pump 161 via the inlet line 122 and the return line 121. When the unit 125 is running, the thermostat 162 generally prevents a run through the water heater 124, which thereby also remains out of operation.

If the power generator 125 is at a standstill and does not emit any heat into the circuit, the instantaneous heater 124 switches on when required and produces the required heat. The thermostat 162 then controls so that the circulating water passes through the water heater 124. However, this is regulated by the control so that a connection at a floor temperature is only possible below 20 ° C.

Such a regulation is provided because there is an active bacterial life in the soil at approx. 20 - 40 ° C. This means that the stored soil is used as an energy buffer so that the waste heat can be fully used in the generation of electricity even in summer. Another advantage is that soil decontamination can also take place in winter at favorable conditions. Furthermore, a generously dimensioned fuel tank 126, a water tank 127 (if possible with a simultaneous line connection to the public supply), a pump 128 for the refueling and the floor spray system, the control unit 160 and various supplies 129 are accommodated in the awning.

When the generator 125 is running, the power supply is basically provided by it. When the generator 125 is stationary, on the other hand, the power supply for the lighting, for the drive devices 38 and 41, for the activated carbon filter 4 and for the other small purchases takes place via the public network or an emergency generator.

In FIG. 5, the canopy 110 is inclined towards the center 2, so that the rainwater accumulating in the center can be collected and discharged through the pipe 11. For this purpose, the center column 10 is double-walled with an outer tube 11 and an inner tube 12. The rainwater can penetrate through the water passage openings 130 into the annular space between the inner pipe 12 and the outer pipe 11 and flows downwards from there, where it flows out through the water passage openings 131 into the support foot 20 designed as a water collecting basin.

In the area of the rotating union 13, connecting pipes are welded in between the outer pipe 11 and the inner pipe 12 in order to ensure that the exhaust gases coming from the carrier 30 are extracted.

The water collecting basin is connected via the filling and emptying line 142 to an overflow device 143 and the level indicator 144, which limits the maximum water level to a predetermined level and guides the water into a drain if necessary. With the help of the suction and pressure connection 145, water can be sucked out of the container as well as pumped in.

An annular inner container 29a can be fastened to the outer tube 11 within the support foot 20 and can be filled with suspension, nutrient or other solutions via the line 140. The filling and emptying line 140 is also equipped at its entrance with a level indicator 141, so that a constant monitoring of the level in the inner container 29 can take place. If the carrier 30 is set in motion via the drive device, then the immersion tubes 37a, b perform a circular movement in the container 29 and of the container 29b formed in the support leg 20. By switching on the adjustable pumps 33, 34 attached to the support 30 and arranged in the lines 35, 36, the line 36 leading to the tillage implement 40 can be supplied with solutions in any desired mixing ratio. Because of these arrangements, no rotating unions are required.

FIG. 6 shows the top view of a floor decontamination system 1. A gate 99 is provided in the boundary wall 93a and can be opened so that a loading vehicle 7 can enter.

Various soil cultivation programs can be carried out with the plant according to the invention.

The starting position is usually the entrance, which is marked by the position of the vehicle 7. The supplies required for the entire decontamination process are stored there or entered into the system. For this reason, this position is also defined as the starting position or position 0 for the individual programs.

1. Equalization and distribution program for drivable concrete floors. First of all, the contaminated soil that has been hit, which has usually been tipped over relatively disorderly, must be leveled out. For this purpose, a coarse planum is manually created with the help of the dozer blade 55 in such a way that heights and depths are roughly and evenly compensated for by remote control.

Then the dozer blade 55 is brought into a higher position than the working depth and the rotary run program is activated. After lowering and possibly inclining the dozer blade 55, this process is repeated until a perfect formation is present.

It proves to be useful if this work is carried out via a combined, manually and automatically controlled section program when the soil is approached.

This in turn means a sectioned rough planum with a subsequent automatic fine planum in such a way that only the angles covering the occupied soil section are entered into the control system and the required reversing circuits are then carried out automatically.

Equalization and distribution program for sandy sub-floors and non-passable concrete floors.

In order not to provide the sand surface with lanes too much when approaching and to avoid injuries to the plastic film or the concrete floor, the flooring of the floor that has been approached must take place starting from the section entrances. This is done roughly manually with the help of the dozer blade 55 and finely with the help of a section program. 3. Aeration and refinement program.

To do this, the system is put into operation from outside to inside and set to automatic. The vertical milling machine 40 then moves to the predetermined depth and switches on in the preprogrammed direction of rotation. Thereupon the undercarriage 70 starts to move at a driving speed adapted to the vertical milling machine. After the first round, the vertical milling machine is automatically adjusted inwards by a milling working width. The driving speed on the traction drive also increases automatically in proportion to the rotating diameter. This means that the working speed of the vertical milling machine 40 remains constant with constantly changing revolving diameters. This method of operation is continued in a spiral until the smallest permissible revolving diameter is reached. Then the vertical milling machine 40 extends, switches off and moves back to the starting position 0.

During the circulation, the trailing dozer blade 55 has the task of compensating for the unevenness caused by the processing.

4. Refinement, ventilation and simultaneous spray program.

In principle, this program works exactly like the aeration and refinement program described above. In addition, depending on the requirements of the vertical milling machine 40, liquids such as water, microorganism-nutrient suspensions, etc. are fed in via the feed system and the spray nozzles 64 (see FIG. 10) below the milling tools, with the aid of the pump installed in the tank. The circulating tank filling is adjusted so that it is sufficient for the maximum storable amount of soil and the 19

Work step does not have to be interrupted. If refilling is necessary for any reason, the system will automatically stop at point 0.

Section programs according to program 3 or program 4.

If sections with different decontamination progress and contamination are present in sections on the ring surface of the floor decontamination center, special section programs can be defined and carried out. In this case, only the corresponding movement angles and the starting positions are entered with the corresponding reversing command. This is also possible with the help of light barriers, contact switches or magnetic impulses.

Biobeet emptying program for sand subfloor and plastic film.

With the dozer blade 55, when the decontaminated soil is removed, it is also possible to implement sectoral prospecting programs according to FIG. 6. In this case, the ground to be driven is conveyed to the respective entrance in such a way that the loading vehicle 7 can only pick up soil at the entrance oriented perpendicular to the center. The sand layer remains intact and can be used for the next organic bed with the finest grading.

Biobeet emptying program for non-accessible concrete floors.

In principle, the dismantling is carried out as in program 6. Instead of the fine leveling, the concrete floor is simply cleaned at the end. 8. Biobeet emptying program with accessible concrete floor.

This is done either according to program 7 or by driving on the transport and loading vehicle 7.

9. Two-shift program

The adjustment mechanisms of the system are dimensioned so that a two-shift program can be run to increase the absorption capacity. This is to be understood in such a way that in the first phase the upper layer is machined to a maximum permissible depth from the vertical milling machine and in the second phase the remaining soil layer is then machined.

Material shifts and accumulations in the organic bed caused by processing do not need to be taken into account in the individual programs, since the shifts take place in a circle and the whole can be viewed as an endless system.

In Figures 7 a, b, the chassis shown in Figures 3 and 4a is shown enlarged. The boundary wall 93a has a tread 94 on which the drive wheel 71 of the carrier 30 rests. As can be seen in FIG. 7a, the upper part of the boundary wall 93a is designed in such a way that a spring tensioning roller 76 can engage under the bearing surface 94. A better fixation of the drive wheel 71 on the boundary wall 93a is thereby achieved. In the embodiment according to FIG. 7b, the boundary wall 93a extends upwards over the running surface 94 and forms the outer wall 93b.

The carrier 30 is shown in section in FIG. The trolley 31 is displaceably arranged on the carrier 30 by means of the trolley wheels 39, the upper trolley wheels 39 being driven by the drive device 38. On the outside of the trolley, a vertical milling cutter 40 is attached on one side and a dozer blade 55 on the other side. During the use of the vertical milling machine 40, the trolley 31 is braced with the carrier 30. Due to the side play between the trolley wheels 39 and the carrier 30, with the cylinder 50 extended, a frictional connection to the block 51 is generated via the frame of the trolley 31 and the carrier 30. For the purpose of adjusting the trolley 31, the bracing is released in each case.

The vertical milling machine 40 has a frame 45 to which the drive device 41 is fastened. The frame 45 is connected to the trolley 31 via a first lever 46 and via the second lever 47 and the lifting cylinder 48. The vertical milling cutter 40 is adjusted in height with the aid of the lifting cylinder 48. The kinematics of the height adjustment is chosen by the special type of arrangement of the lever 46 with its articulation points 52 a, b to the adjustable second lever 47 with its articulation points 53 a, b so that at the most common depth adjustment between 0.6 and 1 m hardly any angle adjustment of the vertical milling cutter 40 takes place. Any necessary corrections can be made using the adjustable second lever 47.

The vertical milling cutter 40 has a hollow shaft 43, on the outside of which the milling cutter tools 44 are arranged. Spray nozzles 64 are provided beneath the milling tools 44, through which nutrient solutions and microorganisms can be introduced into the soil. These spray nozzles 64 are part of the spray device, which includes a storage tank and a pump (not shown), which are connected to the vertical milling cutter 40 via the line 63. The spray nozzles 64 are supplied via the interior of the hollow shaft 43. A dozer blade 55 is attached to a lever arm 57 on the opposite side of the trolley 31. The leveling blade 55 can be pivoted about the pivot axis 56 and its height can be adjusted by means of the lifting cylinder 58 which acts on the lever arm 57.

FIG. 12 shows a section of a stationary system 1 which has underfloor heating. The heating pipes 101 are laid in segments and concreted into the bottom wall 95. The heating pipes 101, which each belong to a segment, are connected to ring lines 104 and 105, which are connected to a heater direction via the hot water supply line 102 and the hot water return line 103. Individual segments can be switched on or off or throttled via the shut-off valves 106, so that different segments can be operated at different temperatures.

FIG. 13 shows a further embodiment with a dozer blade 55 '. In contrast to FIG. 10, where a vertical milling cutter 40 is arranged on the drive device 41 and the dozer blade is provided on the opposite side of the frame 30, in this embodiment, a dozer blade 55 'which can be acted upon on both sides is arranged on the frame 45 and thus on the drive device 41. Using the drive device 41, the dozer blade 55 'can be rotated into the desired position, as indicated by the positions I, II and LT.I. The direction of movement of the dozer blade 55 'is determined by the movement of the carrier 30 and the trolley arranged thereon. The required inclination of the dozer blade 55 'is carried out by means of the adjustable second lever 47 (cylinder). The depth of penetration into the soil to be worked is set by means of the lifting cylinder 48. This gives you the option of leveling or conveying material in oscillating mode. To improve the filling capacity and thus the transport volume, guide plates 49 can be provided on the dozer blade 55 '. The Working width can be adapted to the drive conditions and the carrying capacity of the wearer. Using this device, the filled soil can be leveled and prepared.

Claims

Claims:

1. Plant for the biological recultivation treatment of contaminated soil with a base on which the soil to be treated is spread, and with at least one movable device that extends over the soil and has a drive device on which at least one soil cultivation device is arranged, characterized in that

that the system (1) is circular and

that a center column (10) is provided in the center (2), which is designed at least as a guide for the movable device, which can be driven on the circumference.

2. Plant according to claim 1, characterized in that the central column (10) has at least one tube (11) which is fastened in a support foot (20).

3. Installation according to one of claims 1 or 2, characterized in that the support foot (20) is designed as a trough with bottom (21) and peripheral wall (22).

4. Plant according to one of claims 1 to 3, characterized in that the movable device has a carrier (30) which is rotatably mounted at one end on the central column (10), extends over the soil to be treated (6) and at the other end has a chassis (70) with the drive device (74).

5. Plant according to one of claims 1 to 4, characterized in that the carrier (30) on the center column (10) about a horizontal axis (16) is pivotally mounted.

6. Plant according to one of claims 1 to 6, characterized in that on the carrier (30) with a drive device (38) provided trolley (31) is arranged, which carries at least one tillage implement that a vertical milling machine (40) and / or is a chain milling machine and / or a horizontal milling machine which is independent of the direction of rotation and / or a dozer blade (55, 55 ').

7. Installation according to one of claims 1 to 6, characterized in that the central column (10) and the carrier (30) have means for supplying energy to the drive device or devices.

8. Installation according to one of claims 1 to 7, characterized in that the carrier (30) is a hollow body, the interior of which is in communication with the interior of the tube (11) of the center column (10).

9. Plant according to one of claims 1 to 8, characterized in that the base (90) has a bottom wall (95) which is composed of bottom wall elements (96,97).

10. Plant according to one of claims 1 to 9, characterized in that under the bottom wall (95) air channels are arranged which are in communication with the interior of the support foot (20).

11. Plant according to one of claims 1 to 10, characterized in that a roof (110) is provided which is inclined towards the central column (10).