DE
SWE
A central mine water treatment plant (AzGA) was constructed at the Ibbenbüren-Gravenhorst site in a joint venture with the WKS Group and HST Systemtechnik.
The plant was constructed in several phases:
1. Preparatory work
- A sheet pile retaining wall was constructed and maintained until the end of the project. 3,700 m² of steel sheet piling, in lengths of between 14.0 and 15.0 metres, was installed as a temporary retaining wall.
- Construction of a sheet pile box using the CSM (Cutter-Soil-Mix) method. The soil was excavated underwater, after which 950 m³ of underwater concrete was poured to form the base of the excavation pit.
2. Construction dewatering
- Closed dewatering system with vertical filter wells, combined with vacuum filter lances, including water treatment prior to discharge into the Stollenbach; geodetic lift height up to 6.0 metres.
3. Civil engineering, structural engineering and transport infrastructure
- Neutralisation tank facility with a tank volume of up to 3,600 m³.
4. Asphalt-surfaced transport infrastructure, including drainage and lighting
5. Mechanical and process engineering, including pipework and steelwork for
- conveyance
- neutralisation / sedimentation / post-sedimentation
- Demanganisation / final pH adjustment
- Dewatering
- Control air supply / drinking and process water supply
Exhaust air technology and chemical discharge area
6. Electrical and process control systems
- Ensuring the reliability of supply for the existing plant
- Utilisation and expansion of the existing infrastructure
Medium-voltage supply / centralised main energy management / decentralised low-voltage supply
7. Automation and process control technology, with a focus on
- Staff facilities
- Sludge treatment
- Chemical treatment
- Lime milk treatment
- Communications technology
