Device for collecting seepage of refuse dumps.

The invention relates to a device for the version of leachate from landfills according to the preamble of claim 1.

When landfilling of waste arising leachates. These are, depending on the type of waste composition, polluted for decades and centuries to come. According to today's state of the art landfill leachates are collected by seals, collected and sent for treatment.

Known seal types are mineral seals (eg clay, bentonite with water glass), Bitumen seals or foil seals. Without the seals to deny their fundamental suitability for their task is limited reliability. This is confirmed by results from practice or research projects (Federal Environment Agency, 1984). Leak detection and leak remediation are problems for which up to now still no signs of a suitable solution. As a result, landfills today basically no longer in the protection zones 1,11 oderllla approved. This limitation makes the site selection of municipal solid waste landfills impossible in many parts of the country. Locations of hazardous waste landfills are generally difficult to enforce.

The leachate collection is advantageously isolated from different plots. The reason for this is the different pollution levels of various landfill cells. The separate collection of contaminated leachate landfill cells localized and the respective leachates can be fed to a targeted, adapted treatment. If no such separate treatment, due to the dilution effect mixed water for special treatment (eg third Reinigunsstufe) are deducted, hardly comes into consideration. This pollutants are released into the environment unnecessarily.

The reasons for the almost exclusive mixed water withdrawal are the insufficient reliability of drainage pipes due to lack of strength as well as the overall high technical effort. According to DIN 4033 in conjunction with the ATV worksheet 127, the breaking strength detection merchantable Dranleitun^ps of such pressures, which usually prevail in landfill, not previously provided.

Other sealing systems, eg ROLLINS, USA, where in addition to several artificial seals a fixed ballast is still created by concrete, increase although overall reliability, but are subject to the approval of law enforcement, because of the residual remaining uncertainty, the same reservations as the other seal species ,

The invention has for its object, the generic device in such a way that the reliability of the sealing body at any time, a visual check and the seal in the event of damage can be repaired easily and quickly.

This object is achieved according to the invention with the characterizing features of claim 1 in the generic device.

In the apparatus according to the invention is located in the region below the sealing body of the control room, so that it can be optically controlled by it from the sealing effect of the sealing body at any time. Once the seal to leak at one point, this can be recognized from the control room immediately, so that eyes blicklich countermeasures can be initiated. With the device according to the invention therefore a zero emission in the groundwater body is possible. Thus, the location, making for landfills is made much easier because contamination of groundwater by leachate is excluded with certainty. Landfills can be optionally built using the apparatus of the invention in water protection areas. From the control room can be without difficulty necessary repairs easy run. As a result of the visual inspection of the sealing effect of the sealing body a long-term preservation in a very simple manner is thus guaranteed. By continuous Uberwach- and controllability, it is possible, leachate emissions, equal to prevent what nature, and therefore water protection zones in future site plans involve that previously it does not come into question.

A separate collection and sampling of leachate directly at source differential treatment can be initiated by the presence of the associated analysis results; for example, a biological or chemical cleaning, tertiary treatment, a Sickerwassereindampfung or leachate combustion. This differential treatment, environmental effects can prevent the mixing of water withdrawal and cost savings as a result of dilution effects. The advantages of the device according to the invention can be gauged in comparison for example to landfill Hamburg Georgswader at which dioxin-containing waste with other waste waters mix.

Knowing the localized concentrations of pollutants allows to make targeted interventions from the outside, for example, through a revitalization through dredging of pollutants cooker.

The sealing body may consist of a platform that performs the sealing function itself. The high on load (40 t / m² and more) are differential settlements or vomuszusehen due to shrinkage processes clefts between the platform sections. In a preferred embodiment therefore, the main sealing function is taken over by a suspended seal, which is disposed over the entire surface on the underside of the platform. The suspended seal expediently has low points, which flows through the leachate and is supplied via a sub collector main leachate collector.

To obtain a separate collection and sampling of the leachate at source, the sealing body top is preferably divided by raised area limitations by field. The raised area limitations form sealed walls, with which the individual, formed in this way parcels are delimited from one another and which are arranged on top of the platform. On the accompanying low point of the seal zwe-ckmäfig check stub for leachate sampling arranged.

A preferred application of the inventive device is to remediate contaminated sites later. To this end, the tunnel are conveniently driven close together beneath the contaminated site, thus creating a nachträglicheDichtungsplattform. If a horizontal Emigration, known migrate, leachate or gas is to be expected from the gap between the platform and the landfill base, the landfill appropriate completely or partially surrounded by a sealing wall formed by a tapped cress, a diaphragm wall, sheet piling o .ae. is formed, which forms appropriate to the platform one unit. For optical control this horizontal sealing a bivalve design in the form of a double ring is with intermediate cavity used, which serves the optical control and the version of groundwater, which possibly pushes the outer seal and enters the device.

As Tunnelfonnen recommended, depending on local conditions and ballast, the various proven designs, which are:<ul><li>Hamburg construction (Betonkalender II, 1971, p.263), the cast-in-half-shell combination (Betonkalender XI, 1971, p.244), Simplon Tunnel I with perpendicular ballasted Apennine Tunnel in oppressive mountains, highway tunnel Genoa Seravalle, Ville tunnel Cologne edge channel and other proven tunnel constructions, including icing techniques include that come into consideration during tunneling in ground water levels.</li></ul>

The control room below the platform is so high that he or control to. can be walked or traveled repair work. For suction of calorific landfill gas, depending on the waste composition and environmental conditions, in the order of up to 30 m³/ May apply t · a, are passed from the control room forth appropriate corresponding gas manifolds by the platform. Thus, the problematic installation of vapor pipes at the landfill surface is dispensable. The control room itself is kept free by forced ventilation of hazardous gas constructions.

Further features of the invention result from the additional claims, the description and the drawings.

The invention is explained some more detail with reference / shown in the drawings embodiments. Show it:<ul><li>FIG. 1 is a schematic representation of a section through a landfill with a located below the landfill body control room, which is surrounded by a double seal and has a horizontal field confinement</li><li>FIG. 2 is a schematic representation of a section through a newly constructed landfill with the control room and the horizontal field confinement underneath,</li><li>FIG. 3 in plan view a control room with a cassette division and an access road,</li><li>Fig. 4 in an enlarged view and in section, a portion of the control room with a provided on the ceiling of the control room seal a suspended seal, a floor drain, a horizontal area limitation, a drainage layer, a Drändom and dewatering and degassing,</li><li>Fig. 5 in a view similar to Figure 4, another embodiment of a control room with cassette-shaped base elements of a platform seal, a suspended seal, a drainage layer and drainage well as degassing,</li><li>Fig. 6 in a representation corresponding to Fig. 1 a formed by half shells platform one located below the landfill control room,</li><li>Fig. 7 a schematic representation of a constructed by tunnel profiles control room, the tunnel profiles are connected by half-shells,</li><li>FIG. 8 a schematic representation of a formed from immediately juxtaposed tunnel profiles control room,</li><li>Fig. 9 is a pit landfill.</li></ul>

FIG. 1 shows a section through a landfill 1. You will be underpinned over its entire surface area of ​​a control room 2, which was subsequently propelled tunneling moderately below the landfill. The platform formed from the tunnels 5 closes tightly to a landfill to surrounding slurry wall 30th It is in the embodiment formed double, whereby an inner sealing ring 30 and an outer sealing ring 31 are formed, which are separated by an intervening cavity 32nd He forms a sealing space which is accessible and / or navigable and thus can be visually checked and possibly nachgedichtet.

Fig.2 shows a section through a sealed from the outset with the device landfill. 1 It is also being collected on their total base area by the control room. 2 He is also sufficiently high to make it in maintenance and inspection rounds or DUTY can. From urbanization technical reasons the control room 2 is surrounded by an access road. 3 It is a feeder path 4 opened (Figure 3). The platform 5 is supported by pillars or walls 6. 7 To ventilate the control room 2 reliable, so that no explosive mixture landfill gas formations are formed, streets are formed by the walls 7 expediently, which can be closed at its end 8 or in the range of 4 Zuweges by Scots. 9

In a (non-shown) embodiment, the bottom 11 of the control room 2 is disposed at ground level. Thus, the free ventilation of the control room 2 is made possible.

Measurements of the leachate composition revealed in the past that local differences in the co-tion can be expected. To collect problematic, eg toxic leachates and specifically to locate the associated landfill cells, the platform top 5 is divided into a grid-like cassette 13 by raised area limitations. The separate detection in the associated collection systems can a differentiated leachate sampling and treatment be made.

Fig. 4 shows in detail the platform 5 with surface seal 14 and suspended seal 15, a leachate implementing 16 and secondary collectors 17. For the purpose of landfill gas permeate gas manifolds 18, the seals 14,15 and the platform 5. The vapor pipes 18 open into a leachate and gas drainage layer 19 and in vertical leachate and gas Dome. 20, in which they are branched. The bottom 12 of Kontrollraumes2 is inclined and can be drained through drainage channels. Also, the suspended gasket 15 is arranged inclined towards the side collectors 17th

Fig. 5 shows in detail another embodiment in which the platform 5 is formed in precast panel shape with central low points 16 as a separate feature. The suspended seal 15 is made of prefabricated shapes and mounted on brackets 23rd The prop heads are provided with sealing caps 24, which adjoin the / seal 15th It is formed so that it has a centrally located sub collector 17, into which the leachate is passed.

Fig. 6 shows a statically favorable embodiment of the platform 5 with axially or zweiaxialsymmetrischen shells. The platform wirlerum forms the ceiling of the control room 2 which is located below the landfill first

In the embodiment gem.Fig. 7 the platform 5 is tunne from single l_n25 formed, which are interconnected by intervening hung shells 26th The drainage of the DRAE nschicht 19 via passages 27 preferably in the control room section below the half-shells 26. In this case, the suspended gasket 15 is suitably used. As water passage connecting a fuge 34 is formed between the support 6 and the wall 7 and the half-shell 26th

gem.Fig in the embodiment. 8 several tunnels 28 are placed against each other, which together form the control room. By tightly juxtaposed tunnel 28 a common platform 5 is formed. On each side of each tunnel 28 a by collector 17 is arranged against the suspended gasket is inclined 15 so that the collected leachate is directed into the sub collector 17th In order to prevent leakage of leachate in the range of the adjacent vertical side walls of the tunnel 28, at least one of these side walls is provided passing transversely through seal 35, which is inclined towards the adjacent secondary collectors 17th In the embodiment three such seals 35 are arranged one above the other. Should therefore leachate in the vertical side walls of the tunnel 28 or in the butt joint between the adjacent side tunnel to get down, it is collected by the seals 35 and directed to the respective sub collector 17th

Fig. 9 shows the arrangement of a sealing system in a mine dump. The platform 5 and the bottom 12 of the control room are adapted to the terrain.

The control rooms 2 can also consist of several superimposed spaces that serve to control and also the storage of waste.