In sludge lagoon capping applications where highly contaminated substances must be controlled, geosynthetic solutions by NAUE GmbH & Co. KG will ensure their long-term containment. Similar in concept to soft soil applications, Combigrid® products offer load-distributing characteristics, enabling lightweight equipment to traffic the liquid surface.
High density polyethylene (HDPE) Carbofol® geomembranes provide a virtually impermeable seal to water and gases. They are inert to the aggressive chemicals that are most often present and can be securely welded to form a uniform barrier to the intrusion of rainwater or the escape of gases
To protect Carbofol® geomembranes from excessive deformation as well as the possibility of puncture by sharp edged stones present in the mineral cover soil/drainage layer, a heavy weight mechanically bonded nonwoven cushion geotextile (1,200 g/m² or above) can be installed directly over the geomembrane.
Bentofix® geosynthetic clay liners are well suited to sealing subsoils that are susceptible to large settlement. Bentofix® uses high quality, natural sodium bentonite encapsulated between two geotextiles. Once hydrated, the high swelling bentonite creates a seal against liquid and gas flow. Using high elongation, mechanically bonded cover and carrier nonwoven geotextiles, the uniform needle-punched structure of the Bentofix® can endure deformation of over 30 %. The installation of Bentofix® in a rain-lap orientation will ensure that the seal is not compromised, even after consolidation induced settlement.