EasyMeasure B.V.

- Biofilm Sensor

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In industry and drinking water production plants we often want to prevent biological biofilm formation on all kinds of surfaces that are in contact with water. Some examples are water piping, heat exchangers, water tanks, cooling towers and reactors.

It is very difficult to express the biological growth potential as a quantitative value since it is determined by a myriad of parameters: tempatature, pH, the oxygen concentration in the water, the concentration of nutrients in the water such as ammonium, phosphate and nitrate, just to mention a few. Yet, we would like to pro-actively take action when the biological growth potential increases.

During validation of our Aqua Color sensors we gained practical experience at most different conditions: from tap water and drinking water for poultry to hospital waste water in individual waste water treatment systemsen.

By smartly combining all gained knowledge and experience, the Aqua Color Biofilm Sensor was born. This sensor produces a signal that is a measure for the biological growth potential in water.

How does the Aqua Color Biofilm Sensor work?
The Aqua Color Biofilm Sensor is installed in a water line or submerged under water directly and measures the biological growth potential as follows:

  • Light aborborption is measured at 3 wavelengths: 461 nm, 520 nm en 640 nm.
  • Fluorescence at an excitation wavelengh of 461 nm.
  • Software interpretes the trend in the measurements consisting of the sum of turbidity and biofilm formation.
  • The result consists of the biological growth potential expressed as a number between 0 and 1000 and / or the raw data as a check or for you own interpretation.
  • The data are sent from the intelligent sensor head to your process information system or to our cloud service.

Practical experience with the Aqua Color Biofilm Sensor
In 2017 and 2018, the Aqua Color Biofilm Sensor was successfully tested at the Water Application Center Leeuwarden in close operation with Jorrit Hillebrand, PhD student at the  Wetsus Sensoring theme. In the test program, the data produced by the Aqua Color sensor were compared to those produced by a coax sensor, which is based on impedance spectroscopy. These results, combined with practical experience in the poultry sector, the cooling water sector and the waste water treatment sector, have resulted in the current sensor. The biological growth potential is calculated from the slope of the total signal change as a function of time though in-house developed data analysis software. 

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