Knowledge base
Biofilm in coolant system: how to recognize and remove sediments?
Biofilm is a layer of microorganisms on the surfaces of the cooling system. It improves heat exchange, promotes corrosion and can be the habitat of bacteria.
Why is biofilm dangerous?
Biofilm isolates heat exchange surfaces and protects microorganisms from chemical activity. It may also promote the development of Legionella bacteria.
How to remove and control biofilm?
- Biocides dosing (e.g. under KCAQUA 305)
- Control of circulation and conductivity parameters
- Periodic system cleaning
FAQ
Frequently Asked Questions
Short answers to questions that most often appear on this topic.
How can a cooling tower be protected against Legionella?
The basis is biofilm control, proper biocide, regular water monitoring and maintenance of clean contact surface.
Is a biocide alone sufficient to remove biofilm?
Not always. Biofilm can protect micro-organisms from chemistry, so it is often necessary to correct the program, clean up and control the parameters of circulation.
What symptoms indicate biofilm in a cooling system?
The most common sight is a decrease in cooling efficiency, slippery sediments, an increase in water consumption, an unpleasant smell and a greater susceptibility to corrosion.
Does biofilm affect energy costs?
Yes. The biological layer worsens heat exchange, so the system must work harder to maintain the required process temperature.
How often should cooling-tower water be tested?
The frequency depends on the water load and quality. In practice, it is worth controlling the conductivity, pH, biology and effectiveness of the chemical program in a regular schedule.
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