The integrated municipality Werlte has taken over the wastewater treatment obligation of its member municipalities in accordance with § 97, NWG. For this purpose, it operates the Werlte (15,000 PE) and Lorup (7,000 PE) sewage treatment plants. Due to the constantly growing development of the municipalities, the sewage treatment plants have reached their capacity limits and must be expanded.

Against this background, a “development concept for wastewater treatment in the integrated municipality of Werlte” was drawn up in 2014. The result of the investigation is the closure of the Lorup sewage treatment plant, the transfer of the wastewater to the Werlte sewage treatment plant and conversion of the Werlte sewage treatment plant to digestion. The connection size for the observation horizon 2030 is around 36,000 inhabitants.

Since various measures are associated with the implementation and the sewage treatment plants have to be rebuilt during operation, the implementation is carried out in different phases.

In the 2nd construction phase, the plant components of the biology are to be upgraded or expanded. These include the conversion of a combination basin into an aeration basin and the construction of a new aeration basin, two secondary clarifiers, the distributor structures, an RS pumping station and a blower station including a precipitant dosing station and the new NSHV.

Structural engineering Dismantling of 2 reinforced concrete pools - Dismantling combination basin I made of reinforced concrete, diameter approx. 34.80 m, depth approx. 6.35 m

- Demolition of the pool / building complex LxW approx. 9.47 x 4.00 m, depth up to 5.20 m

Construction of 6 pools and structures in reinforced concrete construction:

- Aeration basin 1, diameter approx. 34.80 m, depth approx. 5.25 m

- Secondary clarifier 1 and 2, diameter approx. 17.20 m, depth approx. 7.58 m

- Distribution structure, LxW approx. 7.50 x 9.60 m, depth approx. 5.7 m

- Return sludge pumping station, LxW approx. 7.64 x 6.00 x 9.60 m, depth approx. 3.62 m

- Blower station, single-storey hall in conventional construction with the basic dimensions LxWxH of around 17.47 x 8.41 x 6.62 m

Reconstruction of the reinforced concrete basin Aeration Basin II - dismantling of an intermediate wall made of reinforced concrete and construction of a shaft structure LxWxH of around 6.60 x 3.35 x 5.10 m in front of the basin.

For this purpose, the scope of measures Lot: Structural engineering includes the following trades:

- Demolition and dismantling work

- earthworks

- drainage works

- Drainage canal works

- Pressure pipeline work

- Road construction work: paving, asphalt work

- Thermal insulation composite system

- masonry work

- Concrete work and concrete maintenance work

- Carpentry and wood construction

- Steel and metal construction

- roofing work

- plumbing work

- Screed work

- Doors and windows

- painting and varnishing,

- drywall work.