Genap B.V. products

In the civil engineering infrastructure sector the access roads to underpasses, aqueducts and below ground level locations are often built using a geomembrane structure as a water barrier for the groundwater. The waterproof geomembranes for these projects have to be installed at such a level that the vertical equilibrium is guaranteed in order to prevent the structure from floating.

In the civil engineering infrastructure sector the access roads to underpasses, aqueducts and below ground level locations are often built using a foil structure as a water barrier for the groundwater. The waterproof geomembranes for these projects have to be installed at such a level that the vertical equilibrium is guaranteed in order to prevent the structure from floating. Installing the geomembranes below ground can be undertaken in two ways: in the wet, which is known as submerging of geomembrane structures, and installation in dry conditions (for under water installation: see the factsheet `Geomembrane Structures for Infrastructure - underwater installation).

A bottom and cover geomembrane for landfill sites always involves a geomembrane that isolates the contamination in order to protect the environment or to specifically protect against potential future contamination. The seals have to be made under an installation certificate by a certified company. Genap has held this stringent KIWA certification since 1997. A 2mm HDPE foil is usually used for both seals. This is specified under the prevailing guidelines for the use of geomembrane structures to protect the environment and/or the Soil Protection (Dumping) Decree.

Bottom proteclion is used when one is working wilh hazardous substances lhat can be harmful lo the environment. In the petrochemical industry liquid-proof geomembrane structures are often fitted underneath storage tanks. Genap has installed these liquid-proof geomembrane structures for a range of national and international clients. Generally a 2mm HOPE geomembrane is used, however, the 100% oil-resistant material Genatex 1150XR is quickly gaining favour.

The storage of waste water is often undertaken in reservoirs, silos or concrete tanks. The type of geomembrane that can be used depends on the type of contamination in the water. The storage method can also require a special type of geomembrane or mean that extra protection is necessary.

This type of cover can be used on every type of tank -from small to large, rotating, round shapes, square or rectangular shape and with or without bridges or landings. These are often used for slurry storage, sewage treatment and in industry.