DE3425783A1 - Process for collecting and removing decomposition gases in landfill sites - Google Patents

Abstract

The invention relates to a process for collecting and removing the decomposition gases resulting from the dumping of refuse and from the filling of such landfill sites. The refuse is filled by layers onto a drainage system lying at the bottom, and, after filling a layer, shafts are dug out of it which are connected to the drainage system. These shafts are filled with voluminous waste matter and subsequently covered on their top side with a sheet. The decomposition gases collecting in the shafts are removed by a suction system via the drainage system lying at the bottom. In each additional refuse layer, new shafts are dug above the already existing shafts and connected to the lower ones and subsequently filled up and covered over.

Description

Process for collecting and removing decomposition gases

in landfills The invention relates to a method for collecting and Discharge of waste that arises when dumping garbage and when filling up such dumps Decomposition gases.

It is known to collect and discharge the decomposition gases in landfills To build gas wells. When the landfill is topped up, these Gas wells are always extended upwards, so that the decomposition gases go upwards can escape.

The decomposition gases rising up through the wells from lower layers of rubbish cause a strong odor nuisance in a wide area around the landfill. aside from that if these gases are flammable, in certain proportions with an air mixture they are even explosive and, if they escape in an uncontrolled manner, pose a serious risk to the population Environment.

The invention is based on the problem of this odor nuisance largely to prevent and those that arise when the landfill is filled up To make gases technically usable.

This task is achieved by the characterizing features of the claim 1 solved.

The advantages that can be achieved with the invention are that in simply a rising of decomposition gases from lower layers into the open air is prevented, and that the decomposition gases even with not yet completed Landfill can be used technically.

A method for collecting and removing decomposition gases is based on a drawing explained in more detail in the following embodiment. The drawing shows a vertical section through a landfill that is still in the landfill.

The reason 1 of the planned landfill must be designed in such a way that a gradient of around 5% to 20%, i.e. at least 5%, to the planned gas extraction point 2 is present. A drainage system 3, for example consists of poured gravel channels, created. This drainage system 3 has the Task to connect the planned gas wells 4 with the gas extraction point 2. aside from that brd drained the seepage water through this drainage system 3. The gas drainage system 3 is advantageous to create so that the intersections of the drainage network 3 to the Places are placed where gas wells 4 are to be created later.

Then the garbage is 5 until it reaches a layer height of 10 m to 15 m filled and compacted in the usual way. Then z. B. with the help of a gripper vertically above the intersection of the gas-LI drainage network Well excavated, which preferably has a round cross-section and a minimum diameter of about 1, have om. As soon as the grab digs up gravel, the well is connected 4 made to the gas drainage network 3. After that, the excavation is carried out with a large volume Waste 6 filled. The large-volume waste 6 has the task of the well shaft to support against the laterally adjacent garbage 5 and good gas permeability of Well 4 to be guaranteed. At the same time, well 4 also serves as a storage site for this large-volume waste 6, which according to a further feature of the invention consists of used tires or empty plastic containers, e.g. PVC or pEE containers. The cavities in the waste material and those created when the waste material 6 is poured out According to a further feature of the invention, cavities can be filled with fillers such as e.g.

Gravel, crushed stone, grit and the like are filled to the well 4 to support and stabilize against the external pressure of the landfill.

The filled gas well is then covered with a gas-tight film 7 covered so that the film 7, as shown in the drawing, another Part of the adjacent garbage 5 with covers. After every well this layer are connected and covered in this way, Brn this first garbage layer 8 already sucked off and with the pouring of the next, the second layer of MEllschicht 9 can be started.

After the second garbage layer 9 has been filled up and compacted9 in this, in turn, wells with the same axis as the wells below excavated and connected to the lower wells by destroying the covering foils 7. The wells of the second garbage layer 9 are in turn with large-volume waste 6 filled and covered with a film 7. The covering film 7 prevents one The decomposition gases rise into the open air, but must be connected to another part of the well on the already existing wells are destroyed.

This procedure is repeated in the same way for each subsequent one Garbage layer The last heaped garbage view of the landfill is preferably complete covered with foil and then covered with a layer of earth, so that a planting the surface becomes possible.

The procedure can also be carried out in the case of an already in the landfill Landfill can be applied. Here, the gas drainage network is on top of the already heaped up Part of the garbage created, and with the existing ones Fountain connected downwards, and then further poured up according to the above procedure. However, the gas drainage network should be used to collect the seepage water at the same time are used, a gradient of 10% to 20% to the gas or water extraction point must be allowed create.

Since the gas drainage network 3 according to the invention also for discharging the resulting Leachate is used, a siphon-like device is at the gas extraction point 2 10, which prevents air from being sucked in via the water drain.

Claims (4)

Claims 1. A method for collecting and discharging when dumping from garbage and when such landfills are filled with decomposition gases characterized in that a reticulated gas drainage system before dumping the garbage (3) e.g. B. made of gravel, which has a gradient of about 5% to 20% to a gas extraction point (2) has, is created, and that then the garbage (5) up to a layer height of 10 m to 15 m above it is filled and then vertical wells (4 ') are dug that deep until they reach the bottom gravel drainage (3), and that this Well (4 ') are filled with large-volume waste (6) and on their surface covered with a gas-tight film (7) so that the well (4) collecting decomposition gas through the gravel drainage network (3) at the gas extraction point (2) is sucked off and further characterized in that a further one Garbage layer (9) is piled up and from this garbage layer in turn fountain (4 ") be excavated with the same axis as the wells (4 ') below and that these wells (4 ") are excavated so deep that the covering film of the underlying well (4 ') is reached and destroyed, so that from an upper (4 ") and a lower (4 ') well a well (4) is created, which in turn is filled and covered with in a known manner, and that in the same way further wells in overlying layers of rubbish can be connected, with the Well of the top layer of rubbish should be covered with a foil (7). 2. The method according to claim 1, characterized in that the large-volume Waste material (6) consists of used tires. 3. The method according to claim 1, characterized in that the large-volume Waste material (6) from empty plastic containers, e.g. B. PVC or PEE containers. 4. The method according to claim 2 or 3, characterized in that cavities of the waste material (6) and voids between the waste material (6) with fillers such as e.g. crushed stone, chippings, gravel or the like can be filled.