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lining is not damaged. Solid wastes are deposited and compacted around wells, which are spaced every 30 – 50 m. At the lower part of the well a filter is mounted. A horizontal header pipe running from the filter discharges leachate to the collection well. A gas extraction well filter consists of a slotted 100 - 200 mm diameter pipe. Pipe length is 2 m and it can be further extended once the landfill is full. The well is protected by a 1m diameter steel pipe; pipe length 2.5 – 5.0 m). A space between the filter and well cover is filled with gravel and cover with a sealing ring. The well cover is gradually extended and the extra space made up with gravel once the landfill expands. The upper part of the filter is made from a non-perforated pipe. A header equipped with a gas valve is mounted on the non-perforated pipe. An outlet port of the valve is connected with a compensation hose to the installation of active gas extraction from the landfill. Picture 1. Wells installed on new landfill sites. Picture 2. Wells drilling on reclaimed landfill. Source: INiG photo. Source: http://www.kellettswell.com/drilling.html On existing landfills, the gas extraction wells are driven into the ground using boring tools (Picture 2). Bore-holes of 400 – 460 mm diameter go down to the solid waste base. In bore- holes perforated pipes are installed; the space between pipe and a bore-hole is filled with gravel. An upper part of the bore-hole is sealed with clay, while space next to the bore–hole is covered with a geomembrane (Figure 3). Such insulation protects against infiltration of atmospheric air into the solid waste bed. Extracted LFG is transported to the collection station, which is an important part of the gas utilization system. 12PDF Image | Landfill Gas Energy Technologies
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