Hemminger Straße in the north of Stuttgart is busy not only at peak times. Approx. 12.000 vehicles drive here on a daily basis - i.a. in the adjacent business park. Due to the traffic load, diverse pollutants that are washed away in the rain collect on the road over time. The polluted rainwater may no longer be discharged directly into the water bodies. It must first go through treatment and retention. On behalf of the urban drainage department of Stuttgart, DAHLEM has designed a cleaning system as a trough-trench system: here, the polluted rainwater is first collected in a shallow, grassy hollow (approx. 500 m²). The accumulated water seeps slowly into the ground. In the process, most of the pollutants contained in the soil layers are filtered out. Under the soil of the trough there is another storage space, which is designed with trenches (250 m³) and ensures that the seeping rainwater can be held back again and introduced as an environmentally friendly inflow into the Lindenbach.
By means of holistic optimization, Waste Water Treatment Plant Aachen-Soers has succeeded in reducing the enormous energy demand of the recovery by around 55 per cent. Together with DAHLEM, the Wasserverband Eifel Rur planned the modernization of the oxygen supply of the aeration tanks. The design was implemented at the beginning of the year, followed by the commissioning of the blower station mid-year. The RWTH Aachen accompanies the project scientifically. DAHLEM supported the process design, which was modeled in a 3D-planning and accompanied the award procedure. The enclosed article about the project provides detailed information about the modernization of the plant. The waste water treatment plant is also referred to as a nationwide model Enterprise.
Article, "Water & Waste Water Technology” magazine, July 2019