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  Control Of Legionella


Organic Water Treatment Chemicals
Steam Boilers, Cooling Towers, Hot And Chilled Closed Systems
Fuel Oil Treatment
(Home of D.M Concentrate)

Control of Legionella

Legionella is a fairly common bacterium found in water, which if inhaled can cause pneumonia like symptoms that can lead to severe complications and even death. The bacterium is transmitted to humans in tiny water droplets that are small enough to be inhaled into the base of the lungs. This is of importance since cooling towers, by their very nature, send a mist of water into the air as part of the evaporation process that is used to cool the water. Listed below are several suggestions to help prevent a possible outbreak of Legionaire’s disease.

  1. Insure that the tower sump is free of sediment.
  2. Make sure that high efficiency drift eliminators are in place, and in good repair.
  3. Prevent areas of stagnation.
  4. Use proper microbiological treatment. The suggested treatment is to maintain continual halogenation (chlorine or bromine) with a 0.5 to 1.0 ppm free residual. If halogenation is intermittent then utilizing a non-oxiding biocide is also recommended. Additionally, a bio-dispersant will help to penetrate any slime masses.
  5. Regularly test the level of microbiological activity and add sufficient biocide (oxiding or non-oxiding) to maintain a total bacteria population below 10,000 cfu/ml.
  6. Utilize proper scale and corrosion control products.
  7. Whenever operations personnel are working in or around cooling towers a filter mask that covers the nose and mouth is suggested

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