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Chlorine Dioxide Application Against Legionella In Biofilms.

Author : Daevid Ribbledale

Legionella control is becoming more and more essential in both domestic style and process style water systems and chlorine dioxide has taken an eminent role in the control of this and other associated organisms. The specific traits of the disinfectant make sure chlorine dioxide gets the job done where other biocides fall short.

Legionella is heavily associated with biofilm, being parasitic in character, and biofilm within the pipe work shields Legionella from the vast majority of typical disinfectants. However, chlorine dioxide is a dissolved gas and thus is able to easily enter the biofilm zone, exterminating the germs and eradicating the biofilm.

Biofilm is a multi-level layer of microbes contained inside a slime covering. It forms on areas touching or submerged in water and bacteria within the biofilm layer attain protection from the slime and as such resistance to concentrations of biocides that ought to normally eradicate or repress these very same bacteria simply suspended in water.

Biofilms bestow a safe haven for numerous pathogenic organisms including E. coli and Legionella where they can propagate to numbers where there is a severe potential risk to health.

It has been shown beyond doubt that chlorine dioxide removes biofilm from water systems and stops it from developing when dosed at a constant low level. Sodium hypochlorite however has been determined to have very minor impact on biofilms. In actuality, chlorine dioxide is one of the few biocides cited by the ACoP L8 to have effectiveness against Legionella.

Extra advantages of chlorine dioxide over more usual biocides are:

* Chlorine dioxide efficiency is generally not influenced by pH and works within an extensive pH level of within 4 and 10
* Chlorine dioxide has a very rapid kill time and as such contact times within the system are diminished
* Chlorine dioxide is extremely soluble and will travel within the water network
* Chlorine dioxide does not form halogenated compounds that have been linked to carcinomas
* Chlorine dioxide is one of the few biocides considered by the ACoP L8 to kill Legionella.

Even though silver catalysed hydrogen peroxide can be utilised as an alternative it can not be dosed for more than 30 days at a time into drinking water supplies due to the health dangers of silver ion accumulation and as such can only be used as a limited term prevention. Chlorine dioxide has consent for continued dosing into water systems and as such is the perfect biocide forLegionella control in drinking water systems.

Author's Resource Box

Make sure you do lots of investigation before choosing chlorine dioxide equipment for Legionella control as equipment can be pricey and must be suited to your requirements.

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Tags:   chlorine dioxide, chlorine dioxide water treatment, chlorine dioxide equipment, legionella control

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Submitted : 2011-04-17    Word Count : 870    Times Viewed: 444