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In the east of the Ruhr district, the former Haus Aden colliery in Bergkamen-Oberaden will be retained as a dewatering site following its conversion to a well operation. The client's mine water concept for this site envisages accepting the mine water from the local Ruhr district and, after treatment, discharging it into the River Lippe in a water-compatible manner. The first conversion measures for well water management were started in 2019 and have already been partially completed. The central measure for the conversion of the Haus Aden well water management system is the construction of a new mine water treatment plant, which is the subject of this contract.
The mine water treatment plant will treat the mine water produced and discharge it into the River Lippe in a water-compatible manner once the target values required by the authorities have been reached. Based on the originally forecast rise in the mine water level, the client had initially planned for the mine water treatment plant to be completed in 2029. An updated model forecast revealed hydrogeological changes in the mine water quality. The changed hydrochemical condition of the mine water and a premature rise in mine water require a short-term rescheduling of the project and an early start to construction as well as early completion and commissioning.
The contract comprises the following main construction services:
- 30,000 m² topsoil removal
- 30,000 m of full displacement columns using the CMC method
- 14,000 m³ of concrete for structural engineering construction
- 550 m DN 600 GRP pipes
- 500 m DN 400 GRP pipes
- 2 x thickeners á 16.00 m diameter and 9.00 m height
- 300 m steel line 4.00 m high
- 2 x treatment lines consisting of
1 x reaction tank
2 x sedimentation tanks
Total 93.00 x 28.00 m and 6.00 m height per line
Special features of the project:
- The dovetailing of the construction with the parallel planning process
- The time-critical realisation to ensure the operation of the mine dewatering system
The project will run for around 24 months from July 2025 to July 2027 and will be realised together with two other consortium partners. The contract is worth a total of 41.5 million euros.
