Multriwell can be installed rapidly, flexibly, safely and cost-efficiently. The process starts with a design according to which the optimum grid separation between the vertical wells is determined. Working on the leveling layer on top of the waste each vertical Multriwell is forced into the landfill site at a precise GPS monitored position. During penetration the depth and resistance from the waste are accurately registered and recorded. As a result, following installation of the vertical drains, the penetration resistance can be charted out in detail showing information about the composition of the waste.
Following installation of the vertical Multriwells, the horizontal Multriwells are fitted. These are connected together and also collect the gas from the waste environment before transporting it via grooved collector tubes to the manifold(s). The drains are then covered with the leveling layer, topped off by a capping layer (e.g. Trisoplast® or geomembrane). Depending on the environment and the applicable regulations the sealing layer is covered by other commonly used layers such as a separating geotextile, a drainage layer or composite and finally the topsoil.
The Multriwell method is remarkably flexible. Each individual vertical Multriwell can for example be forced into the landfill site to a predetermined depth, depending on the resistance measured. If it proves impossible to install the Multriwell at the required depth due to unexpectedly high resistance, a new vertical Multriwell is pushed into the waste as close as possible to the original well. This additional well multiplies the effectiveness of the adjacent well. By doing so a highly effective and well-functioning system is achieved.
Because there is no contact with the waste during installation, the fitting of the Multriwell system is cleaner and safer than the traditional method of excavating wells. Throughout the process safety is our first priority. The released gases are constantly monitored and safety regulations are strictly adhered to.