Ultraviolet Disinfection


Interest in using ultraviolet (UV) light to disinfect drinking water is growing among public and municipal water systems  due to the ability to inactivate pathogenic microorganisms without manufacturing  regulated disinfection by-products (DBPs). UV light has proven effective against some pathogens, such as Cryptosporidium, that are resistant to commonly used disinfectants like chlorine. Ultraviolet disinfection and ultraviolet sterilization systems are an effective and economical means of water purification and  disinfection, by eliminating harmful bacteria and other microbes from drinking water supplies, regardless of source. Ultraviolet Light (UV) is suitable for water supplied from rain tanks, springs, bores and surface sources such as lakes and streams. UV light or ultraviolet radiation  is commonly used for water disinfection, uv sterilization and water treatment on a wide range of water sources by many local municipal governments, councils, food, air, aquaculture, pharmaceutical, wine and brewing industries and by thousands of domestic and industrial consumers to ensure their water is safe to drink. Infralight Pty Ltd will design and supply a system that is suitable for your budget and requirements.
UV Disinfection System from Infralight

Custom UV Systems

Infralight supplies a wide range of uv disinfection and uv water treatment systems, both standard and custom designs available. This means any flow requirement can be met. Infralight offers a range of UV disinfection systems from flow rates as small as 10/min up to Mega litres per hour. The design of the Infralight UV disinfection systems is intended to provide many years of reliable operation at an economical price. The treatment chambers are AS316 stainless steel with the option of plastic  for seawater applications. A range of options is available to customise the system but the basic specificationis suitable for domestic, farm and light industrial use. Infralight's  UV water disinfection systems are designed for continuous operation treating cold and hotwater at any flow from 0/min up to the specified design rate. 

Ultraviolet disinfection for drinking water

Sizing of the UV System

Microorganisms must be exposed to the UV light for a certain amount of time. This is called the UV dose or more correctly fluency, measured as joules/m2: Ws/m2 or mJ/cm2. The amount of UV light required is dependent on the type of organism, but most systems are based on flows to eliminate E.Choli. The pathogen must be exposed for a period of time by the correct amount of light at the right wavelength of 254nm.The relationship between light volume and time is critical for effective reduction. The dose of uv light required to effectively achieve a % reduction is a logarithmic relationship. The dose of uv required to achieve 90% reduction is calleda Log1 reduction. Doubling the amount of uv, Log2, will achieve a 99% reduction. Log3: 99.9, Log4: 99.99, log5:99.999. Most systems are designed to achieve a log4 reduction of 99.99%. E.Choli requires approximately 6mWs/cm2. To achieve a 99.99% reduction, multiply this value by 4 which is 24mWs/cm2. Most ultraviolet disinfection systems are designed for a minimum 30mWs/cm2 dosage.

Microorganism Inactivation Chart   mouse

UV sterilization from Infralight

Pre-Filtering

Pre-filtration is usually required to ensure that particulate matter does not shield micro-organisms from the UV light. 20 micron cartridge filtration is the usual minimum. In cases with fine turbidity in the water, or if cysts like Giardia or Cryptosporidium may be present finer filtration may be necessary. In this case one micron filtration is required, usually but not necessarily for the whole supply, filtration for the drinking tap only may be practical. In drinking water treatment in particular the dual barrier approach to disinfection of using one micron filtration and UV is strongly recommended for the security this provides the user. For water containing high levels of sediment or iron, pretreatment with a backwashing filtration system is likely to be cost effective.

INFRALiGHT-Leaders in UV Disinfection

 
 

 

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