Sewage treatment plants consume large amounts of electrical energy and space. It is not possible to cover the area with conventional photovoltaic systems since the settling basins must be accessible from above at any given time for operational reasons.
Solar technology redefined. – The HORIZON foldable solar roof by dhp technology is erected over already used areas and allows for an intelligent dual use of industrial sites. In August 2018, the world’s first solar folding roof above a sewage treatment plant was commissioned at the Chur sewage treatment plant (Switzerland). It covers an area of 5,800 m2 and completely covers the pretreatment, secondary (biological) treatment, and tertiary treatment basins. The 2,120 modules produce 550,000 kWh of electrical power per year – equalling about 20 % of the auxiliary power required by the plant.
Flexible and autonomous. – The foldable solar roof operates completely autonomously and automatically adjusts to the ambient conditions, using the weather data of a local weather station and external sources. The sun controls the intelligent drive units with integrated PLC automatically: Using robust cableway technology, the solar panels unfold automatically as soon as the first sun rays are visible. They return to their protective garage position when the sun goes down in the evening. The foldable solar roof also returns to this position automatically in case of snow, hail or wind, and extreme situations – such as power or communication failures.