Disinfection with ultraviolet light

Disinfection with ultraviolet light

The deployment of chlorine, chlorine dioxide, hypochlorite and other chemical substances to disinfect liquids can result in effects which are detrimental to health and the environment. UV technology is the better alternative to chlorine disinfection. The intensively researched and technologically mature disinfection method with ultraviolet light is adapted from the natural action of sunlight.

Light spectrum

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Ultraviolet light is energy-rich light with a wavelength of 200 – 400 nanometres (nm). UV light is very versatile and can be used for disinfecting water, destroying harmful microorganisms in other liquids, on surfaces, and in air. The intensive UVC radiation, most strongly in the wavelength range of 254 nm, reaches the microorganisms and impacts directly on their DNA. By changing the DNA the cell division of the microorganism is interrupted – it can no longer reproduce itself and thus loses its pathogenic effect. With UV technology it is possible to destroy more than 99.99% of all pathogens within seconds, without addition of chemicals, without harmful side effects, inexpensively, highly efficiently and absolutely reliably.


How UV disinfection works with liquids

UV disinfection is a purely physical process. The light necessary for UV disinfection is generated in special UV lamps. A watertight tube made of quartz glass which allows the UV light to pass through surrounds each lamp. The liquid to be disinfected runs past the quartz tubing, being irradiated by the UV light. The number of UV lamps employed vary according to amount, flow rate and transmittance of the medium. WEDECO UV systems are suited for the disinfection of drinking water, process water, waste water, salt water, ultrapure water and other translucent fluids, e. g. sugar syrup.

Reduction of Pollutants with UV Light

Ultraviolet light is also suitable for oxidation and there-fore for the reduction of undesirable substances in water. For example, UV light with a wavelength of 185 nm oxidizes hydrocarbons, chlorine, NDMA and reduces TOC values. In combination with ozone and peroxide UV-light can additionally be used for advanced oxidation processes (AOP) for degradation of persistent pollutants from drinking water or wastewater.

The WEDECO Technology

The core elements of the WEDECO UV systems are very high performance UV lamps developed and manufactured in house. Their effectiveness is increased by electronic control devices specially coordinated to the lamps. In each system, calibrated sensors monitor and log all material factors for the disinfection process.  Moreover, additional functions such as UV dosage display, automatic cleaning and remote monitoring of all process functions via telemetry and internet can be integrated. For optimum efficiency, specific computer-based radiation geometries have been developed.

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