How UV Disinfects

The Idea:

At Renby, we view the safe use of our fogging systems to be of the utmost importance. Any industrial system which uses water in its operation must be safeguarded against legionella as well as other bacterial risks.

Therefore, rather than relying only upon chlorinated mains water, we add a second line of defence, namely Ultra Violet (UV) disinfection.

How it works: The Science

MicronFog Multizone Filters

Before reaching the system tubing and nozzles, the water is passed through 2 filters (5 micron and 1 micron).  It then goes through the UV disinfection unit where UV light passes through the water to disinfect it.

UV has a strong germicidal ability.  As UV light passes through the micro-organism, it alters the structure of its DNA, thus preventing reproduction of the organism.  UV is frequently used as an effective water disinfectant. Protecting against bacteria such as Salmonella typhimurium, Clostridium tetani, Staphylococcus and Streptococcus and viruses such as E. Coli, Hepatitis, Polio and Rotavirus. It is effective against protozoa such as cryptosporidium as well as mould spores and yeasts.  

In order for the UV light to reach the bacteria, the water must be filtered first or the large particles present in the water will block the UV before it reaches the micro-organism.

Maintenance

Filter Panel with UV Filter

UV lamp systems must be replaced from time to time depending usage levels . Renby provide replacement UV lamps as either a complete housing and lamp or lamp only.

UV lamps do not burn out. Instead, they solarize, which reduces their intensity to about 60% after about one year of continuous use. New lamps generate a dosage level near 60,000 µW-s/cm2.

When the dosage drops to 30,000 µW-s/cm2 (the minimum dosage needed to effectively kill bacteria) lamps should be replaced. Lamp life will be shortened if the lamp is turned on and off more frequently than once every eight hours. 

MicronFog™ Systems include an interlock which prevents the system from running when the lamp has reached the end of its life.