Efficient prevention of legionella at 4 plants

The problem

Legionella bacteria live in water and multiply mainly at temperatures between 25°C and 45°C. Sanitary water and cooling water are thus the ideal biotopes for this bacterium. Inhalation of small water droplets contaminated with legionella can cause the serious disease legionellosis.

For the prevention of legionella, companies and organizations today mainly rely on the use of chemical biocides (for cooling towers), periodic flushing (for sanitary installations) and laboratory analyses. Because they have little information about the extent to which legionella bacteria are present in the water, they often use biocides and flushes unnecessarily as a precaution.

In 2020, Vlakwa (Flemish Water Knowledge Center) launched another “open call” for projects on water quality. Out of 17 proposals, 4 projects were finally chosen, including Liquisens’ PREMOLEG project.

Our solution

PREMOLEG stands for “preventive monitoring of legionella”. Using smart sensors, we measured various water quality parameters: temperature, flow rate, acidity, …

Through artificial intelligence models, we were then able to detect increased risk, perform a quick offline test for the presence of legionella, and suggest targeted actions for legionella prevention.

During the project we were supported by LOVAP, WTCB and the University of Antwerp.

The result

Thanks to Vlakwa, we were able to test our innovative method for legionella prevention in different types of companies and organizations:

Our solution allows them to reduce the dosage of chemicals used to control legionella bacteria and reduce the number of flushes without negatively impacting the effectiveness of their treatment. The end result? Effective prevention of legionella at a lower cost and with less impact on the environment.