Can free chlorine be reduced in water using UV light? Read this months newsletter to find out. We also provide links to download our new application and product brochures.

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De-chlorination using UV-C UV light

Did you know, free chlorine is used in our town water supplies to provide residual disinfection and protection against a variety of pathogens. It may also be dosed in other water using processes and industrial applications.

There are a number of documented negative effects of free chlorine use in a variety of applications as described below:

• Drinking water - by-products linked to negative human health implications including cancer. Impacts taste and odor.

• Food and beverage - impacts on taste and odor of final product if not removed.

• Manufacturing - unwanted chemical reactions may occur such as in pharmaceutical manufacturing.

• Swimming pools - formation of combined chlorine or chloramines resulting in allergic reactions.

• Water treatment processes - damages Reverse Osmosis (RO) membranes and other sensitive treatment process components.

A popular method of reducing or removing free chlorine is by using activated carbon; however, this method has its own limitations and disadvantages as follows:

• The media used is an ideal habitat for microorganisms.

• Free chlorine may occasionally get through.

• Costly to regenerate or replace media.

Another option is to use chemicals such as Sodium Bisulfate but this will still result in taste and odor changes, along with other undesired chemical reactions.

Ultra-Violet (UV) light is a proven chemical free method of reducing free chlorine and it is gaining popularity. Studies have shown that water that is subjected to UV treatment at a UV dose of 90mJ/cm2 achieves a free chlorine loss of 0.3 mg/L.

UV light used to reduce free chlorine has the following advantages:

• Chemical free – no impact of taste, odor or pH.

• Reduces free chlorine and disinfects against all known spoilage microorganisms and human pathogens.

• Eliminates risk of introducing microorganisms into downstream processes.

• Reduces risks associated with chemical handling and storage.

Contact our water engineering department today to discuss the use of UV for dechlorination.

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Our new application and product brochures

We have a suite of new and updated application and product brochures which can be downloaded from the image below.

In addition to the existing product brochures, we have created a P-Series brochure along with a new P-Series web page. The P-Series is suited to seawater aquaculture applications such as in fish farms and hatcheries.

The following application brochures have also been created:

• Is swimming in a pool of chemicals safe?

• Using UV water disinfection to combat Legionnaires disease

• Microbial free water for medical applications and environment

• Pathogen free water for fish, shellfish and crustacean farms

Ask us if you would like these brochures customizing to include your company logo and contact details!

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Take advantage of the governments small business $20,000 tax deduction

We remind all of our small business subscribers to take advantage of the governments tax deduction for any individual assets purchased costing less than $20,000.

This is great opportunity to upgrade an existing or old UV disinfection system or if you haven't already, incorporate UV disinfection as a water treatment measure in your manufacturing process or water supplies.

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Contact us

Our sales or engineering team are here to help. Contact us if you need a UV lamp identifying, a UV system specifying or any other UV disinfection or water treatment related query.