Result description
The wastewater treatment plant (WWTP) of Wörgl-Kirchbichl in Austria, is a medium-size two-stage municipal WWTP that encounters strong seasonal variation due to tourism, with high nitrogen returns in sludge dewatering effluent (SDE). This case study offered a great opportunity to integrate and evaluate at full-scale an optimized concept for the side-stream treatment of the SDE via nitritation to support the development of an energy positive WWTP.
Operational long-term experience indicated a stable and effective SDE side-stream treatment. Seasonal loading and temperature fluctuations did not affect the stability of the process.
Compared to single-stage WWTP, the concept of 2-stage WWTP with side-stream SDE nitritation provides significant savings in energy consumption and increment of biogas yield.
A modelling based comparison of nitritation in SDE with other available treatment processes shows in details the advantages of SDE side-stream nitritation in regard to energy efficiency and costs. The model’s outcomes were verified also applying different WWTP layout (two-stage and single-stage) and sewage composition.
Addressing target audiences and expressing needs
- Grants and Subsidies
- Collaboration
Even though the developted treatment process concept is now mature for market deployment, the results of the investigations indicate that for climate protection, the side-stream process needs to be optimized in terms of minimizing nitrous oxide emissions. For this reason, we are willing to address this relevant topic in a new research project.
- Public or private funding institutions
- EU and Member State Policy-makers
- Research and Technology Organisations
R&D, Technology and Innovation aspects
Result submitted to Horizon Results Platform by TECHNISCHE UNIVERSITAET WIEN
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