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.
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