Sewage control to ensure better water quality

Few utilities have a systematic approach to controlling sewage systems as a solution to reduce overflows.

Nadia has dealt with this in her business postdoc. She has developed a tool that can estimate whether there is potential to control the sewage in a given area. Unlike separation and other traditional solutions, sewage control is often cheaper and emits fewer greenhouse gases.


DTU & Envidan


Industrial Postdoc





In 2021, Envidan applied for funding from Innovation Fond Denmark to start a business postdoc between Nadia Kirstein from Envidan and DTU. Six Danish utilities have also provided input and feedback throughout the project through participation in interviews, meetings and workshops.


Get a handle on utilities’ control potential with a new tool

Nadia has now completed her research, which has resulted in a concrete tool that can estimate whether there is a control potential in a given area. ‘Control’ means, for example, whether a given pump should be turned on/off or if a gate should be open/closed to save on overflow from the sewage systems. Once the control potential is determined, it can lead to a real control strategy for the utility.

Utilities can save on overflows

Reduced overflow from sewage.
Better water quality in rivers and streams.
Better bathing water quality.

The benefits of assessing the control potential can be great, and in addition to less overflow, it will result in less pollution, which has an impact on our animal and plant life along rivers, lakes and the sea.



  1. Through her research, Nadia has gained a general understanding of why utilities find the control of sewage systems beneficial.
  2. Based on an analysis of several Danish utilities, Nadia has mapped the biggest barriers for utilities in terms of to be able to implement governance.
  3. A tool for utilities to quickly map the control potential for overflow reduction has emerged.

Contact me
for more information

Nadia S. V. Kirstein


+45 61 42 14 14

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