Germany – Facade work – Kläranlage Aurich-Haxtum: Bau Faulung II - Fassadenbau

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 municipalities. In addition to the predominantly municipal wastewater, the Aurich wastewater treatment plant also treats dairy wastewater from the local dairy Rücker. The current inflow load is approximately 68,500 EWCSB. To stabilise and reduce the primary sludge produced during wastewater treatment, a sludge digestion plant has been operated at the wastewater treatment plant since 1963. Despite ongoing optimisations and renovations, the sludge digestion plant has reached its performance limit due to increased inflow loads. The existing digestion capacity is only limitedly sufficient for the primary sludge and the flotation sludge produced 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 use the excess sludge (ÜS) for energy purposes, as the digester with a digestion time of far less than 20 days is already overloaded. Therefore, all the ÜS sludge is stabilised in a composting plant. 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 plant is to be discontinued and the ÜS sludge is to be used for energy purposes and sludge reduction in a sludge digestion plant as well. For this reason, the construction of a sludge digestion plant for the ÜS sludge is necessary. This includes the following measures:

- Construction of a new digester for ÜS sludge incl. operating building

- Erection of a new gas storage and emergency flare

- Installation of a new CHP plant and digester gas purification

- (Installation of 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 main scope of services of the contract unit is listed below for each lot.

- Lot 1 Earthworks (already awarded)

- Lot 2 Earthworks

- Lot 3 Structural work

- Lot 4 Steel construction

- Lot 5 Roofing work

- Lot 6 Façade construction

- Lot 7 Door/window construction

- Lot 8 Plastering work

- Lot 9 Screed work

- Lot 10 Tiling work

- Lot 11 Painting work

- Lot 12 Mechanical engineering

- Lot 13 EMSR engineering

- Lot 14 CHP engineering

- Lot 15 Demolition and dismantling of the former gas flaring system