PROCESSING | WATERPROOF MEMBRANES
Hydraulic conductivity testing – following ASTM D6766 – was carried out on Solmax’s BentoLiner coal ash-resistant (CAR) polymer-enhanced GCL to test its compatibility with the bottom ash leachate. Results showed that its hydraulic conductivity was sufficient. The samples reached hydraulic and chemical equilibrium with the leachate, meeting the new CCR storage regulations.
Above: Agru geomembranes were used to protect groundwater from contami- nation in Kazakhstan
The project also helps the client because there is
no unpleasant methane odour, meaning that no methane is escaping into the atmosphere – which helps to cut greenhouse gas emissions.
Pond lining In the USA, Solmax also helped Xcel Energy to build a second coal combustion residuals (CCR) pond in Becker, Minnesota. It needed to meet more stringent CCR storage regulations than its predecessor. The project required excavation and movement
of nearly 460,000 cubic metres of soil while address- ing environmental and wildlife concerns. This required a product that could be installed quickly and meet a strict permeability metric – which was geosynthetic clay liners (GCLs) from Solmax. Because ash leachate is aggressive, a standard bentonite GCL would not meet permeability requirements. The project required a polymer enhanced product and proof that the GCL would meet the regulatory requirements for permeability.
Site remediation Agru of Austria recently helped to remediate a former landfill site in northern Italy. The Sigmundskron landfill, in Bolzano, closed in 1993 and has since been remediated several times. The most recent – a three-month project that ended in January this year – saw it reprofiled and stabi- lised, with the addition of a multi-layer surface sealing system. This was achieved with Agru’s Microspike HDPE lining systems. Multi-layer surface sealing prevents the penetra-
tion of precipitation water and the escape of landfill gases. Several layers of different materials were applied to the landfill surface. The project was led by Bautechnik, which has organised similar projects in the past. Construction of the surface seal required careful planning and implementation to ensure effective impermeability, and to protect the environment and the health of local residents. The project began with a base layer on which
geotextiles were laid. Microspike lining systems were then installed on top. These geomembranes, made of HDPE, offer resistance to chemical attack, landfill gases and UV radiation. A drainage layer of geotextiles was installed over the geomembrane to drain rainwater and reduce pressure on the
Booth C835
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IMAGE: AGRU
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