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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.

Many municipalities have experienced how massive the damage caused by heavy rain can be in recent years. Targeted flood prevention against are heavy rainfall and flash floods is becoming increasingly important in this context. It represents a major challenge for the municipalities and is closely linked to the municipal adaptation to climate change. The establishment and implementation of coordinated rain risk management is on the one hand a new task. On the other hand, a flood preparedness system coordinated by the various specialist departments increases the complexity of planning and administrative processes and raises questions that are still unanswered. The project "Municipal Flood Prevention - Planners in Dialogue" of the German Institute for Urbanism (DIfU) in cooperation with DAHLEM and numerous experts from the various administrative departments of 15 German cities examined how flood prevention can be achieved within a network of municipalities. The project was funded by the German Federal Environmental Foundation (DBU) in the course of two years. The special feature of the project lies in the fact that the municipalities were represented in each case by the affected department (urban planning, environment, landscaping, roads, municipal water supply and sewerage, disaster control). In eight daily workshops, case studies were developed, where typical obstacles and problems but also possible solutions and success factors lie. Based on the practical experience of the municipalities, recommendations and solutions for administrative work within a municipality were summarized in a brochure. It serves as an aid to municipalities that want to get more involved in heavy rain protection and answers questions (FAQ) on the topics of organization, law, financing, planning/implementation and operation maintenance.

Download the brochure:
Municipal flood prevention - planners in dialogue (4,5 MB)

The Video of the Emschergenossenschaft shows the construction progress of the sewer

It is the last section of the approximately 51-kilometer-long gigantic sewer from Dortmund to the wastewater treatment plant at the Emscher estuary in Dinslaken. The section of the sewer is adjacent to the landscaping of the new Emscher dike in Holtener Bruch in Oberhausen. After almost nine years, the sewer is almost completed. It lacks then only the last three kilometres from the sewer to the last wastewater treatment plant before the Rhine. The serwer is designed as a double frame profile using the cut-and-cover construction method and partially laid to form an arch. The Emscher sewer is completed in the Essen area. In September 2018 it was completely flooded up to Bottrop. A full commissioning is planned for 2020. All services related to the object and specialist planning have been provided for the project. The video of the Emscher Water Management Association shows the construction process of the serwer.

The Video of the Stadtwerke Karlsruhe shows the future project of the watersupply treatment plant Mörscher Wald

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.

  • Behandlungsanlage für das Regenwasser der Landesstraße
  • Angeschlossene Fläche ca. 5 Hektar
  • 500 m²-Mulde für Rückhaltung und Versickerung
  • 250 m³ zusätzlicher unterirdischer Stauraum in Rigolen
  • Gedrosselte Einleitung ins Gewässer
  • Langzeitsimulation zum Nachweis des Gesamtsystems

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 is 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 implements 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 advises DAHLEM scientifically during its implementation. The plant is expected to be operational at the beginning of 2018.

The project "MURIEL - Multifunctional Urban Retention Spaces: From Idea to Realization", funded by the German Federal Environmental Foundation, was successfully completed in June 2017. 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. 

Teil 1 – Wissenschaftliche Grundlagen (ca. 20 MB)
Teil 2 – Fallstudien (ca. 78 MB) 
Teil 3 – Arbeitshilfe für Planung, Umsetzung und Betrieb (ca. 52 MB) 

As a joint venture partner, DAHLEM has been awarded the "Planning services for the Water City of Aden - Service Package 2 Lake" under the Regulation on the Award of Public Contracts Procedure (VgV-Verfahren), which has been launched by the city of Bergkamen. Over the next years on the Datteln-Hamm canal an innovative and exceptional residential quarter will develop on the territory of the former “Haus Aden” colliery in Bergkamen: the "Water City of Aden", a high-quality residential and commercial area, flanked by two water bodies - to the north by the Datteln-Hamm channel and to the south by a planned lake and countryside landscape. The centerpiece of this residential quarter is the future Adensee with a sports booth harbor, foundations for housing in and around the water as well as close to the natural riverbank landscaping. The planned canal serves to provide for relaxation by the water and also to maintain the water quality of the Adensee. Between the lake and the Datteln-Hamm canal a connection is established, which is usually open and can be traversed by sports boats. A shut-off port allows the temporary separation from the Datteln-Hamm canal. The design and approval planning was completed by DAHLEM in 2015. In the meantime the planning permit was issued and DAHLEM was entrusted with the continuation of the planning up to the construction supervision stage. The planning scope includes the six-hectare Adensee, including the waterproofing and the embankment, the canal and an overall management concept with the related technical facilities.

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.