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The News chronologically lists the current events as short news.

Project news

Even if there are no visible electrical installation works on the construction site of Pumping Station Oberhausen yet, the electrotechnical equipment ist making bis steps forward. At the factory acceptance test in Finland, two out of the 10 frequency converters of the "small" and "large" sewage pumps were successfully tested and approved by the manufacturer as the first components of the powerful drivelines. These are frequency converters with a nominal voltage of 690 V and a rated current of 1.180 A, respectively 1.700 A, which corresponds to a rated output of 900, respectively 1.250 kW. The high demand on the network repercussions with limit specifications to the harmonic, inter-harmonic and, for the first time, also to the supra-harmonic currents, required the frequency converters to install active line filters and correspondingly large-sized line reactors. These are, like the actual power electronics of the frequency converter, cooled by water. Each frequency converter consists of 5 control cabinets, with each frequency converter being approx. 3 m wide. Helmut Mangelmann heads the Electrical Engineering Department at DAHLEM and works in the team of the design consortium (Planungs-ARGE) of Pumping Station Oberhausen: "We have planned and built quite a lot in the field of electrical engineering, but these dimensions go far beyond the previous performance levels. In the low voltage sector, they are at the limits of what is technically possible in terms of circuit and transmission technology."

The government grant decision, which the Environment Minister Franz Unterseller (left) handed over to Lord Mayor Fritz Kuhn (middle) and City Director Wolfgang Schanz (right), Head of the Civil Engineering Department, on 3rd September on the spot, was the starting signal for the expansion of the main sewage treatment plant Stuttgart-Mühlhausen with a fourth treatment stage. The main sewage treatment plant Stuttgart-Mühlhausen, built in 1916 as one of the first sewage treatment plants in Germany, is operated by Stadtentwässerung Stuttgart (SES) and should count to the most modern ones in the Federal Republic by 2028. Due to the complexity and the considerable investment, the expansion will take place in three construction phases. In the first phase, powder activated carbon silos and dosing stations will be set up at the Biology North and South as well as an energy control centre will be built. The federal state of Baden-Württemberg supports this project with just under 3 million EUR. With the construction of the treatment stage for the elimination of trace substances, the City of Stuttgart is making a significant contribution to water protection in the federal state. Dipl.-Ing. Mathias Kleffmann, process expert at DAHLEM and project manager of the design consortium, is pleased. "It's great that we can now start with the direct dosing on a large-scale and implement the new process technology on a industrial scale." 

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

Events/Presentations

This year's focus of the 90th Darmstadt waste water workshop is on the further municipal waste water treatment. Reducing emissions from urban water management in the context of achieving a good water quality under the EU Water Framework Directive is becoming increasingly important. In addition to organic substances and nutrients, anthropogenic micropollutants ans antibiotic-resistant germs are also in focus. The outlined problem is presented and discussed in lectures. Thus, a comprehensive picture of current developments is given and supplemented by lectures on the focal points of future requirements and treatment objectives, processes for trace substance reduction and antibiotic resistance. In addition to the symposium, we are represented with an information booth. Visitors to the conference are welcome to familiarise themselves with our engineering with regard to further treatment methods from the subject-specific projects.

Company News

Since the start of the woman's promotion programme ChanceMINT.NRW of the University of Duisburg-Essen, female students have been visiting DAHLEM Engineering Office. The female students at the Department of Civil Engineering, Electrical Engineering and Energy Systems are preparing for a career path that is highly male influenced. This year seven female students, together with two project coordinators, got an idea of the practical daily work process here. Jana Sommer, who designs sewage engineering systems as an engineer at DAHLEM, looked after the group and talked about her professional work routine. "It brings me great joy to inspire the female students for the versatile and interesting job of an engineer at an engineering office". In October 2013, the University of Duisburg-Essen started the program ChanceMINT.NRW for female students of natural sciences and engineering disciplines. The programme offers them the opportunity to gain networking and future-oriented practical experience in numerous workshops. Corporate advisors allow female students in the first three semesters to prepare for their professional entry and future career. Gregor Dahlem is involved in the programme as a corporate advisor: "Our employees are our most important asset. In order to promote young engineers at an early stage, we are glad to get involved with ChanceMINT.NRW."
 

Creating a flower meadow together: under the expert guidance of a landscape gardener, Young and old prepare the area for the new flower Meadow on the garden plot of DAHLEM. The employee´families were also invited. The kids had particularly a lot of fun energetically removing the turf, raking and sowing the seeds. With a smile, Jan-Gregor Dahlem tells us that his five-year-old son remembers this experience so well that he still speaks of the flower Meadow at kindergarten. The intense commitment to nature was subsequently with a hearty snack.

It is meanwhile the 9th Essen company run that the DAHLEM running community can register. Again it was said: Together - for each other. A highly motivated Dahlem Team, which meanwhile also consists of our employees´children, started again. "Being here and arriving is our motto." From 19:00 o'clock on, the starting line filled up with the runners at Huyssenallee. The route could be covered by running or walking. It was not the competition between the companies that took place there; everyone came together to make the most of the sporting event with great fun and dedication. The popularity of the Company run is unbroken - from year to year, more participants take part. In 2019, around 11.000 athletes ran to the finish line.