Airconditioning and legionella
Possible contamination of air treatment systems with legionella bacteria
|Air treatment systems in buildings, also known as airco or air-conditioning systems (these systems don't just cool but also treat, filter and humidify), are related to the risks of a legionnaires disease outbreak (remember the recent outbreak in a Spanish shopping centre). |
What is the origin of the legionella bacteria and what are the risks.
The legionella pneumophila bacteria is naturally occurring in surface water (even in drinking water). However to grow and multiply it needs nutrients, a place to grow, like present in biofilm, and a water temperature between 20 and 55 degrees.
If a group of legionella bacteria is released from the biofilm and the water in which it houses is sprayed and inhaled by people with impaired immune defence it can cause the much feared legionnaires disease.
In Dutch air treatment systems, temperatures above 25 degrees are rare. Also normally there would be no "wet spots" with biofilm in which the legionella bacteria can grow.
What are the possible dangers?
Lenntech is manufacturer and supplier of solutions to the problems above. For information, advice or a quotation you can call, fax or e-mail us.