Ultra Violet Technology for Water Treatment
Violet technology is used in many applications including drinking water,
swimming pools, ultra pure water, CIP rinse water, process water and wastewater
and has therefore applications in the Semiconductor, Food and Beverage,
Pharmaceutical, Aquaculture, Swimming Pool and Cooling water Industries
in addition to industrial and municipal wastewater.
The most common UV lamp is the low pressure (LP) mercury type which emits
monochromatic light at a wavelength of 254nm and has high germicidal efficiency
and is most suited for “good quality “effluents at moderate flow through
rates. Low Pressure UV lamps have low power consumption and long life
(12months typically) however light intensity may be insufficient for poorer
quality waters. Low Pressure Lamps output are 115 watts at most so for
higher flow rates the number of low pressure lamps required may be a limiting
Medium pressure UV lamps (MP) emit polychromatic light with a more complex
spectrum with only some 5% of the wavelength being produced at 254nm,
however this is offset by the much higher power output of the medium Pressure
lamp with can be up to 7 Kw.
Other components of UV systems are equally important in ensuring efficient
operation including the electronic ballast, wiper systems to maintain
lamp cleanliness, UV intensity monitors, control systems etc.
type of UV systems most applicable for any application depends upon the
amount of energy required for the treatment objective (disinfection, TOC
reduction, waste water treatment) and the quantity of water to be treated.
UV Dose is calculated by the following formula:
UV Dose(mJ/cm2) = Intensity ( mW/cm2) x Time ( sec )
Some typical dose requirements are:
IIC Limited has expertise in the design and application of UV technology
for different applications and can directly support client requirement
and solution choice.