Germany – Roof-covering work – Kläranlage Aurich-Haxtum, Bau Faulung II - Dachdeckungsarbeiten

The subject of the tender is the construction of a new sludge digestion facility at the Aurich-Haxtum wastewater treatment plant. The Aurich-Haxtum wastewater treatment plant treats the wastewater of the city of Aurich and the surrounding villages. In addition to the predominantly municipal wastewater, dairy wastewater from the local dairy Rücker is also treated at the Aurich wastewater treatment plant. The current inflow load is approximately 68,500 EWCSB. A sludge digestion plant has been operated at the wastewater treatment plant since 1963 to stabilize and reduce the primary sludge generated during wastewater treatment. Despite ongoing optimizations and renovations, the sludge digestion process has reached its performance limit due to increased inflow loads. The existing digestion capacity is only partially sufficient for the primary sludge and the flotation sludge generated during the pretreatment of the dairy wastewater. The digestion process is sometimes overloaded and leads to difficult operating conditions. During maintenance and repair work on the digester (approx. 60 years old), there are currently no reserve capacities available. It is currently not possible to energetically utilize the excess sludge (ÜS) generated, as the digester with a digestion time of far less than 20 days is already overloaded. Therefore, all ÜS sludge is stabilized in a composting facility. The operation of the sludge composting requires a lot of space, results in high sludge disposal costs and is generally uneconomical. In the long term, the operation of the composting facility is to be discontinued and the ÜS sludge is to be fed to a sludge digestion process for energetic utilization and sludge reduction. For this reason, the construction of a sludge digestion facility for the ÜS sludge is necessary. This includes the following measures:

- New construction of a digester for ÜS sludge incl. operating building

- Erection of a new gas storage and emergency flare

- Installation of a new CHP plant and sludge gas purification

- (Installation of a sludge disintegration; planned later)

- (Installation of a reception station for fats and co-substrates; planned later)

- Integration of the new construction measure into the existing plant and control technology

The Aurich wastewater treatment plant is located in Haxtum. Address: Kläranlage Aurich Haxtum Zum Antjebitt 1 26605 Aurich

Scope of services of the contract unit

The essential scope of services of the contract unit is listed below by trade.

- Trade 1 Earthworks (already awarded)

- Trade 2 Earthworks

- Trade 3 Structural work

- Trade 4 Steel construction

- Trade 5 Roofing work

- Trade 6 Façade construction

- Trade 7 Door/window construction

- Trade 8 Plastering work

- Trade 9 Screed work

- Trade 10 Tiling work

- Trade 11 Painting work

- Trade 12 Mechanical engineering

- Trade 13 EMSR technology

- Trade 14 CHP technology

- Trade 15 Demolition and dismantling of the former gas flare plant