MATERIALS | WATERPROOF MEMBRANES
90°C puts a strain on the geomembrane material used to line the pit. To withstand this over a longer period, and
ensure operational reliability of the PTES, Agru has developed a temperature-resistant material based on PP-HTR.
It was tested at the Institute of Polymeric Materi-
als and Testing (IPMT) at the Johannes Kepler University in Linz for temperature resistance and durability. IPMT estimates the service life of the geomembrane – at a continuous temperature of 90°C – at more than 25 years. The geomembrane was installed as a pit sealing
system. A temporary floating cover was also added until the pit was filled. This was later dismantled and replaced by Agru’s PP-HTR geomembrane. It serves as a floating base for the heat-insulating cover on top of it. A leakage control system guaran- tees a waterproof sealing during installation and continuous monitoring of the pit throughout its service life. The PTES system has a charging and discharg- ing capacity of 30MW and a storage capacity of 3,300 MWh – which helps raise the sustainability of the heat supply.
Material recycling Solmax has been involved in a European project to recycle geotextiles – from construction projects – back into plastic granules. As part of a project to install high-voltage
pylons, temporary access roads were built on grasslands. The project used 500,000 sq m of Mirafi Geolon HMi-5 geotextile as a separation and stabilisation layer, which halved the amount of sand required beneath the concrete slabs. This mini- mised sand consumption and decreased the number of transportation trips required. Then, a collaboration between Solmax, Switch (a
contracting group) and Tennet saw the geotextile recycled at the end of the project. This approach makes temporary access roads a model for circular economy practices, says Solmax. By converting the used geotextile into pellets, the materials are reintegrated into Solmax’s production cycle. However, the challenge was formidable. There was no process to efficiently recycle geotextile that was highly contaminated with soil – which required an innovative approach to ensure the cleanliness of the recyclate. During installation, Switch and Tennet envisaged
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