POLO-ECO plus PREMIUM
The Arctic char, a delicious and extremely nutritious edible fish, is now being farmed in Obervellach in the Möll Valley. At a site covering 10,000 sq m, the operators built an aquaculture facility based on a system developed by Peter Brauchl.
Alpenlachs Aquakultur Group, the licensor, pays particular attention to local environmental requirements. Top priority for the planners and developers was therefore protecting the sensitive ecosystem in the Alps, maintaining the ecological function of the freely flowing water, ensuring the ponds blend in with the natural scenery and selecting eco-friendly construction materials. What they built were eleven octagonal-shaped ponds enclosed with fir wood and lined with clay at the bottom. The water needed for the system is piped in from a nearby stream, Wunzenbach. Fresh water flows into the fir tanks tangentially at a rate of 200 litres per second to keep the 70,000 Arctic char they contain moving. The fresh water is supplied and distributed using the POLO-ECO plus Premium polypropylene pipe system from POLOPLAST. As the Austrian Research Institute (OFI) certified that they are suitable for use with potable water and demands on quality were high, the farm operators decided to use POLO-ECO plus Premium multi-layer polypropylene pipes. Not only is the fresh water supplied but also the effluent containing waste products discharged using POLO-ECO plus PREMIUM pipes. Several times a day these products are flushed with a small amount of water through an outlet in the funnel-shaped clay bottom of the ponds at a slight gradient to a downstream constructed wetland for wastewater treatment. Once the water is treated there in a biofilter with aquatic plants to capture and degrade pollutants, it can then be discharged to an outfall. The biofilter itself consisting of a constructed wetland provides ideal habitats for stone crayfish, fire salamanders and black storks. To distribute the wastewater over the entire biofilter area, POLO-ECO plus PREMIUM pipes tested by POLOPLAST for UV resistance were laid as a header on the surface.