www.swimmingpoolnews.co.uk
UVSystems OCT 2011 SPN WHY CHILDREN’S POOLS CAN BENEFIT MOST FROM UV
Children’s pools are often shallow, warm with a high surface-to-volume ratio, and the water is frequently agitated by the use of fountains, and slides. All of these conditions encourage the formation and release of the trichloramine species, which can be removed using UV light. When bathers use chlorinated swimming pools, a variety of chemicals are introduced in the process. Athletes using the pool for laps or exercise will sweat, and children using the pool for recreation often introduce urea into the pool water. Not in- frequently, pool hygiene is poor and those entering a pool have not showered to remove sun creams or hair gel.
These organic pollutants react with the chlorine to form combined chlorine, and one of these, trichloramine has a marked acrid odour. It is the main cause of red eye and is linked to elevated levels of asthma in children.
Water circulating through the pool is exposed to a specific spectrum of UV light, which is absorbed by microorganisms’ DNA, resulting in permanent, irreparable inactivation of the microorganism.
In addition, UV light initiates photo-chemical and photo-oxidation reactions that destroy chloramines, the by-products of chlorine disinfection. This reduces the associated health risks along with unpleasant odours, eye and skin irritation, and corrosion to pool hall structures. UV was introduced into swimming pools in the UK in the mid 1990’s. Early attempts to use it involved the combination of UV lamps and infra red emitters; the UV was to disinfect the organisms in the pool water and the infra red emitters destroyed the combined chlorine species. The lack of full flow capacity, and high cost led some pool operators to opt for ozone systems, which promised much. Ozone remained a preferred technique for several years, however high initial capital cost, coupled with ageing and complex plant requiring continuous attention led operators to think again about UV light. The arrival of powerful medium pressure lamps, capable of treating a full recirculating flow, with
automated wiping and lower overall operating costs led to the replacement of ozone by medium pressure UV systems.
The UV market in the UK is headed by Glasgow based Triogen (Degrémont
Technologies–Triogen); Hanovia and atg UV Technology although there’s a wide spread of options for anyone looking for a UV option. Virtually no microorganisms are immune to UV, even chlorine-resistant pathogens. Another major benefit of UV is that it significantly reduces the need for backwashing and dilution, saving hundreds of pounds a month for pool operators. A typical UV system consists of a UV lamp in a protective quartz sleeve which is mounted within a cylindrical stainless steel chamber. The water to be treated enters at one end and passes along the entire length of the chamber before exiting at the other end, receiving a dose of UV energy along the way.
There are two main types of UV technology, based on the type of UV lamps used: low pressure and medium pressure. Low pressure lamps have a monochromatic UV output (limited to a single wavelength at 254nm), while medium pressure lamps have a polychromatic UV output (with an output between 185-400nm).
TRIOGEN ADD INNOVATION WITH NEW AUTUMN UV LAUNCHES
World leading UV treatment specialists Triogen continue to add innovation on to the market backing up the businesses commitment to quality engineering. Triogen are exhibiting two
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ESCO AIMS TO BRING STRONG MARKETING APPROACH TO UV SALES
ESCO International, specialists in UV, ozone and advanced oxidation processes who are to focus even more on the UK specialist market, don’t want to be another system manufacturer. “What we want to bring to the market is a strong marketing approach to UV,” says Nizam Yasin from ESCO UK. ESCO International designs its range of specialist UV products but sub contracts the production of the units to be built in Europe.
“For us it is all about keeping overheads low. We are aware that cost can be an issue when deciding to install UV so everything we can do cost wise will help our customers.
“There is no doubt that cost might have held back some element of sales of UV but the system is clearly far more reliable and cost effective. It is easy to install and once the operator has been trained properly then any servicing is a matter of changing a bulb.”
Ease of installation and maintenance is a key theme adds Nizam who developed detailed knowledge of the ozone option for water purification before using his experience in chemical engineering to design a UV system which he believed provided a different and better option for pool owners.
ESCO International offers the specialist pool market a range of standard single and multi-lamp units as well as custom designed low and medium pressure UV systems and the company has identified the pool industry as one they feel offers room for expansion.
“UV systems have the ability to treat large volumes of water through their systems to provide efficient breakdown of chloramines through the photochemical processes and provide a significant reduction in the chlorine smell associated in and around swimming pools.”
“Chlorine is still required for residual disinfection, but pools using a UV system
Triogen’s innovative UVARAY cross flow system, available from the end of November, has been developed over 18 months
require up to 90% less of the chemical than pools without UV”
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