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Biofilm management in water systems using hydrodynamic cavitation technology

The Biofilms project will study the impact of gas bubbles produced by hydrodynamic cavitation technology on biofilms and water quality in distribution networks and buildings. The research contributes to the objectives of Finland's Sustainable Growth Programme and supports ecologically and economically sustainable growth, as well as increases knowledge on water technology and water treatment and reduces greenhouse gas emissions.


1.8.2022 – 31.8.2024

Total budget

253,837.58 €

South Savo ELY Centre

181,321.00 €


24,152.55 €


48,364.06 €

Biofilm control is essential to ensure the hygienic quality of domestic water systems in distribution networks and buildings. Typically, the microbiological quality of water, including biofilm formation, is controlled by disinfection chemicals. When microbiological contamination occurs, the solution is usually to flush the water system using high concentrations of disinfectant chemicals. However, it often takes quite a long time to clean the water system, as the microbes that caused the contamination can take refuge in biofilms that are difficult to remove. Biofilms are also protected by lime and other precipitates.

The project will investigate the impact of gas bubbles produced by hydrodynamic cavitation technology on biofilms and water quality. The knowledge gained will help to better prepare for future issues and changes.


Project Manager
Meija Kivisaari
tel. +35844 710 3307

Project objectives

  • To contribute to Finland's sustainable growth objectives and to support ecologically and economically sustainable growth.
  • To reduce greenhouse gas emissions by providing chemical-free oxidation technology for safer and more ecological sanitation of water systems.
  • To prevent the formation of scale and corrosion in piping systems, thereby extending the life and efficiency of water systems.
  • To reduce the risk of domestic water-borne epidemics caused by biofilms in the household water network.
  • To reduce the risk of microbiological contamination of the final product and of wastage in an industrial environment.
  • To expand the business opportunities and export activities of companies using the results of the project and increase employment.

Projects activities

  • Develop new technology and method to control the growth and microbial content of biofilms on the internal surfaces of drinking water systems by producing nano-sized gas bubbles in the water.
  • Design of the necessary equipment and practical experimental set-up.
  • Test and study in practice the impact of the device and the nanoscale gas bubbles it produces on biofilms, sediments, and water quality on the internal surfaces of the water system in the laboratory, in a pilot network, and on potential end-users.
  • Validate the performance of nanotechnology and study its benefits for keeping the water supply system clean.


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