Central Wastewater Treatment Plant

The project was necessary to replace the ageing existing plant, improve the efficiency of wastewater treatment and ensure long-term compliance with statutory requirements for water protection. The treated effluent from the plant is discharged into the Fischbach under controlled conditions. Furthermore, the treated water serves secondary purposes: during the summer months, some of it is supplied to the agricultural sector and, where necessary, is available as an additional fire-fighting water reserve for the local fire brigade.

The structural work for a central wastewater treatment plant places extreme demands on the durability and watertightness of the reinforced concrete used. The concrete structures at the St. Gangloff treatment plant – in particular the aeration tank, the secondary clarifier and the underground inlet channels – are in constant contact with mechanically abrasive and chemically aggressive wastewater. To withstand these stresses in the long term without the need for refurbishment, the structural shell was constructed as a watertight concrete structure. To achieve the required concrete quality and absolute watertightness, two specialised system solutions based on modern concrete technology were used at St. Gangloff:
The water-draining formwork membrane Zemdrain^® and the coated metal waterstop Fradiflex^®.

The combined use of Zemdrain^® for surface quality and Fradiflex^® for joint construction ensures that the concrete structures at the St. Gangloff sewage treatment works will reach their planned service life without premature concrete damage. The structural shell thus forms a durable and completely watertight foundation for the mechanical systems and building envelope, which are currently under construction.