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.
Mechanical engineering structures:
- Aeration basin 1 (new building, diameter approx. 34.80 m, depth approx. 5.25 m)
Components: aeration system, agitators, pipelines - aeration tank 2 (conversion, diameter approx. 34.80 m, depth approx. 5.25 m)
Components: aeration system, agitators, pipelines - secondary clarifier 1 and 2 (new building, diameter approx. 17.20 m)
Components: including scraper bridge, drainage channel, pipelines - return sludge pumping station (new construction, dimensions approx. 7.64 x 6.00 x 9.60 m)
Components: ao screw pumps, submersible motor pumps, pipelines - discharge volume measuring shaft (new construction, dimensions approx. 2.30 x 3.20 x 2.70 m)
Components: MID measurement - blower station (new building, single-storey hall in conventional construction)
Components: including turbo blower, pipeline construction, room ventilation - precipitant dosing and storage (new construction)
Components: including storage tank, dosing station, measuring technology - alkali dosing & storage (conversion)
Relocation of an existing silo, renewal of the pipe screw conveyor 2. Dismantling - dismantling of the mechanical equipment of an existing combination basin
3. Construction & provision of a temporary pump:
- Drainage sewage treatment plant,
- Diversion of runoffs up to 340 m