Die Anpassung an den Klimawandel bedeutet für die Städte und insbesondere für die Metropolregionen weltweit eine große Herausforderung. Die Vermeidung von Schäden durch Sturzfluten ist dabei ein wichtiger Aspekt. Gefordert ist ein integrales Starkregenrisikomanagement, das planerische, technische und administrative Maßnahmen umfasst und vorläufige Überflutungsrisikoanalysen beinhaltet. Die Handlungsempfehlung beschreibt die Hauptkomponenten des Risikomanagementansatzes, der sich in Europa mittlerweile als wirksam erwiesen hat. Die Empfehlungen sind weltweit übertragbar unter Berücksichtigung der regionstypischen Randbedingungen. Im Rahmen eines Teilprojektes zur Handlungsempfehlung „Urban Water Management for Future Cities“ entwickelte DAHLEM gemeinsam mit dem Chinesisch-Deutschen Wasser Netzwerk SIGN ein lokal anwendbares Handlungsschema für eine zukunftsgerechte Überflutungsvorsorge in China.
The News chronologically lists the current events as short news.
In November 2018, the groundbreaking ceremony for the construction of the new Mörscher Wald Waterworks took place. The currently existing waterworks dates back to the 1930s. The facilities are technically outdated and essential parts of the system must be renewed. The new construction will ensure the future vital potable water supply of the city of Karlsruhe and the neighbouring communities. The determination of the potable water requirements by 2040 revealed that in the future, due to climate change and projected population growth, a capacity of 60.000 m³/d, respectively 3000 m³/h, would have to be maintained as maximum output for raw water pumping and treatment. After commissioning of the new plant, the existing one will be completely dismantled. The architectural design of the building provides for a harmonious integration into the forested environment. As a joint venture partner, DAHLEM is entrusted with the building, interior and landscape planning. For the purpose of the construction planning, a BIM-oriented 3D model was set up.
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.
After 40 years of operation, the old circular grit chamber with circular scrapers at Düsseldorf-Süd Wastewater Treatment Plant was replaced by a new grit chamber with two stainless steel longitudinal scrapers. The new scrapers, each weighing 4,5 tons, with a span of 13 meters, run over two parallel sand-trap basins. In January 2017, the demolition works of the old plant began, as the previous plant components were no longer economically feasible to overhaul. The renovation and renewal of the mechanical treatment stage is carried out while maintaining the treatment plant in operation. DAHLEM provides the project and technical design planning (construction technology, structural design, technical equipment) through to the construction supervision.
In July 2018, the two new digesters of Wastewater Treatment Plant Würzburg were inaugurated. They are considered an art installation when illuminated. The concrete buildings with the façade insulation have already been implemented since spring-time and now also the membrane shells are on the digesters. Dr.-Ing. Anke Durth is the responsible project manager for the construction of the two new digesters. "They replace the 40-year-old digesters of the wastewater treatment plant, the capacity of which is no longer sufficient to treat the entire amount of sewage sludge. With the new digesters, the amount of sludge to be disposed of is reduced by one-third and power production is tripled", explains Anke Durth, who has been working for 15 years in the expert committee KEK-1 of the DWA-Board Committee for Recycling/Energy/ Sewage Sludge. The water and sewerage company of the city of Würzburg commissioned DAHLEM with the planning for the new construction of the digesters and several operations buildings, in which the facilities for gas treatment, gas utilization, co-substrate acceptance, etc. are housed.The façade design of the digesters and the operations buildings is the result of an architectural competition. The towers are covered with membrane layers of different shapes, so that two similar but not identical sculptures have been created.
Costing 60 million Euro: Oberhausen Pumping Station on the Holtener Bruch is also currently known as the largest excavation pit in North Rhine-Westphalia. With a diameter of 45 meters and a depth of 45 meters, it is an important cornerstone of the Emscher conversion. The pumping station is one of the largest in Europe. "Supervising such a large and complex planning activity over such a long period of time is an incredible challenge, says Dipl.-Ing.Marc Althoff, the responsible Design Manager. The pumping station is part of the overall planning for the ecological transformation of the Emscher between Dortmund and Dinslaken and will annually feed approx. 170 million cubic meters of wastewater to the Emscher estuary waste water treatment plant. The architecturally accurate visual concept harmoniously integrates the building into the ecological reconstruction of the Emscher. The project comprises the provision of all services related to object and technical planning (structural engineering, technical Equipment)
On Thursday, April 12, 2018, the Eifel-Rur Water Association and the mayor of Aachen, Mrs. Margarethe Schmeer, commissioned Europe's largest ozonation plant at the Aachen-Soers wastewater treatment plant. The treatment plant has been equipped with an additional treatment stage to remove trace substances from wastewater and implemented in the existing wastewater treatment. The wastewater treatment plant has been cleaning the sewage of the city of Aachen since 1913 and is dimensioned for 458,300 population equivalents. The large-scale ozonation plant belongs to the NRW state-funded project "DemO3AC" (Demonstration project for ozonation of wastewater to the Aachen-Soers treatment plant) and should contribute to a considerable reduction of anthropogenic trace substances and a significantly improved water quality of the Wurm river. An accompanying research in situ investigates how the ozonation of the wastewater treatment plant effluent affects the water in particular. A joint venture with DAHLEM as the lead company is responsible for the object and technical planning. The state of North Rhine-Westphalia supports both the large-scale realization and the accompanying research. In October 2017, after only eight months’ construction time, the topping-out ceremony was celebrated.
At the wastewater treatment plant Paderborn, a research project for the tertiary wastewater treatment with a fourth treatment stage was currently being set up. Biologically activated carbon filtration (BAC) is a novel process combination of ozone and activated carbon filtration designed to significantly reduce the total annual costs and increase the amount of eliminable substances. On behalf of STEB Paderborn, DAHLEM implemented the large-scale research project on the wastewater treatment plant, which is funded by the state of NRW. The Institute for Urban Water Management (ISA) of RWTH Aachen advised DAHLEM scientifically during its implementation. At the beginning of 2018 the plant went into operation.
The project "MURIEL - Multifunctional Urban Retention Spaces: From Idea to Realization", funded by the German Federal Environmental Foundation, was successfully completed. The German Federal Environmental Foundation in Osnabrück commissioned DAHLEM as part of a joint venture with the research project, which aims to show ways in which existing inner-city open spaces can be used as emergency flooding areas during heavy rainfall events. The use of public open spaces as temporary retention areas is an important and necessary contribution to municipal flooding prevention - especially with regard to climate change. The three-part documentation summarizing how such retention rooms can be implemented and what needs to be considered in the concept and design is available for download here.
In 2018, RAG Aktiengesellschaft is going to suspend coal mining. Mining aftereffects need to be taken care of. Mine water discharge, polder measures and groundwater management are the “eternity tasks” of the post-mining era. Mine water conservation protected the mines from watercourses which had to be pumped out and discharged via streams and rivers. The future water retention should avoid environmental damage. The long-term mine water concept developed by RAG for the Ruhr region provides for a partial increase in mine water without affecting potable water. Through the use of subterranean waterways, the number of pumping stations is to be reduced, and the mine water still there is to be discharged without damage. The necessary pressure pipelines were planned for two locations: the Zeche Zollverein colliery and the Lohberg mine. A total of approx. 16 km of pipeline from DN 500 to DN 1.200 has been laid. A specially developed, novel monitoring system detects leakages at the pipes - also with regard to the pipeline route in the nature and landscape conservation areas.