 |
Landfill Gas (LFG) Wells
On old landfills we often find horizontal gas drainage systems. These systems have a high risk of damage caused by movements in the landfill body (settling phenomenon) and eventually become inaccessible when too much waste is piled on top. Repairs, if not impossible, will be difficult and costly. Today, the installation of vertical, extensible gas extraction systems is state-of-the-art. Such wells can also be retrofitted to existing landfills in the event that it is not possible to repair or modernize the old system.
Gas wells are exposed to heavy stress caused by mechanical movements in the landfill body. According to local conditions, standard wells or heavy-duty wells will be used.
Gas wells are exposed to heavy stress caused by mechanical movements in the landfill body. According to local conditions, standard wells or heavy-duty wells will be used.
Gas wells (Examples). Left and centre: HAASE standard wells, steel DN800. Right: Heavy-duty well, steel DN800.
The technique used to put the wells in place strongly depends on the quality and nature of the landfill body. Ramming and different methods of drilling are most common.
Installation of landfill gas wells.
A separate pipeline connects each gas well with the manifold station. A circular pipeline then delivers the gas to the booster unit.
Sudokwon landfill site, Seoul/Korea. General plan of the gas extraction system, Area 1
PDF-documents can be viewed with Acrobat Reader, which is available for free from Adobe.
