We are committed to continuous innovation and product development. The technical aspects of the business are split into two main sections: Research and Development and Validations/Approvals.
UV light is a physical, nonintrusive method of ensuring that organisms are unable to replicate, and with a typical life of only a few minutes, they are rendered harmless.
Correctly sized UV systems can also be used to de-chlorinate or de-ozonate process water and to assist in the removal of TOC and urea from ultra pure water. The level of a pathogens inactivation depends on the UV dose (UV intensity x exposure time) applied and the pathogens susceptibility to this UV dose and it varies for every pathogen.
UV does not affect the taste, colour, or pH of the fluid being disinfected and, as such, the technique is often used where conventional chlorine disinfection cannot be applied, such as within a brewery, soft drinks plant, pharmaceutical facility or fish farm.
atg UV are committed to providing Ultraviolet disinfection systems that deliver the required amount of UV for a given application. This has become paramount as pressure increases on facilities to provide sufficient treatment. With this in mind, atg have invested in Bio Dose Testing on selected product ranges, enabling atg to offer “Validated” systems.
atg UV Technology have a large number of validated UV systems to ensure UV disinfection performance. Our validation testing has been carried out in accordance with the United States Environmental Protection Agencies (US EPA), Ultraviolet Disinfection Guidance Manual (UVDGM).
The EPA method is one of the most modern and rigorous testing regimes in the world, offering a number of benefits over other existing validation standards, such as an increased flexible operation for validated equipment.
The US EPA UVDGM 2006 uses the mandate of the Safe Drinking Water Act to monitor emerging contaminants, under the Unregulated Contaminant Monitoring Regulation (UCMR2).
Aimed at water supplies originating from lakes, reservoirs, groundwater aquifers and rivers, the purpose of the US EPA UVDGM legislation is to ensure populations are kept safe from emerging pathogens, such as Giardia and Cryptosporidium.
These pathogens are among 17 such species of microorganisms that are resistant to conventional disinfectants, such as chlorine. There are no microorganisms that are resistant to Ultraviolet disinfection.
As an industry leader with considerable experience in supplying US EPA Validated UV systems for Cryptosporidium protection, atg UV Technology are well placed to support and advise all water companies on the application of the validated units into water disinfection strategies.
These include: log reduction, RED Dose, installation into existing infrastructures, upgrades and retrofits, ongoing industry regulation and future product development.
atg UV have designed and developed a large range of fully compliant UV systems, specifically for municipal drinking water and waste water applications.
Additionally, our experience in the US pools market has placed atg UV as an industry leader for validated swimming pool UV systems. For instance, thanks to atg UV’s close work with the New York Department of Health, it is now compulsory in New York State (US) to fit UV on spray-pad type aquatic features.
UV light output at 254 nanometres is known as UVC light (germicidal region). UVC light has the ability to inactivate all known microorganisms, bacteria, pathogens, virus and moulds, including chemically resistant organisms, such as Cryptosporidium and Giardia. UV dose (fluence) is calculated from intensity (UV Power) and time (flow rate) and is typically measured in mJ/cm2.
For more information about UV dose and system selection, read our guide here.
Sizing a UV system is primarily based around water quality. Water quality is measured inUVT (Ultraviolet Transmittance). This measures the clarity of the water to ultraviolet light, relative to that of distilled water (taken to be 100%). Specifically, this property is measured in a quartz cuvette at a fixed UV wavelength of 254 nm. If the water is of high quality, e.g. borehole water, the UVT will be high – around 95% UVT, allowing the UV light to easily penetrate the liquid.
If the water is low quality, e.g. river water, the UVT will be low – around 80% UVT, requiring additional power or additional UV lamps to achieve the same UV dose performance. It is important to note that a fall in just a few % UVT can double the amount of UV intensity required to provide disinfection.
|Typical Application||Typical UVT %||Normal Required Dose|
|Drinking Water||90% – 95%||16 mJ/cm2 RED – 40 mJ/cm2 RED|
|Waste Water||50% – 80%||20 – 30 mJ/cm2 Average|
|Swimming Pools||94%||60 mJ/cm2 Average|
|Aquaculture||85% – 90%||320 mJ/cm2 Average|
|Rain Water Harvesting – Irrigation||80% – 85%||150 mJ/cm2 Wall Dose|
|Rain Water Harvesting – Process||80% – 85%||30 mJ/cm2 Wall Dose|
|Process Water – Towns Mains||90%||30 mJ/cm2 Wall Dose|
|Make-Up Water – Towns Mains||90%||30 mJ/cm2 Wall Dose|
|Cooling Loops||70% – 90%||30 mJ/cm2 RED – 80 mJ/cm2 Wall Dose|
The use of UV light has now become standard practice in a vast range of industries, including municipal drinking water and wastewater treatment, industrial process and manufacturing, offshore and marine and aquatics. Ultraviolet disinfection systems are used to ensure water is free from harmful organisms and is a proven, regulated and environmentally friendly technology.
In order to provide the best Ultraviolet system to suit your needs, the following variables are required to accurately size a UV system for a specific application. The following information is helpful but not essential to providing a quotation:
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