Ultraviolet (UV ray) water disinfection is a widely used technique in the world. Since UV technique does not leave any permanent substance in the water, it provides a great advantage for some applications.
It is effective on creatures such as bacteria, viruses, spores, parasites.
The "mean contact time" in which water flows through and comes into contact with UV rays must be at least 1 second.
Special UV lamps produce the necessary UV rays in the "UV disinfection devices" used in water disinfection. A UV device consists of two main parts:

1) UV reactor: There are one or more UV lamps in the reactor. To protect it from contact with water, the UV lamp is in a protective quartz glass tube. Water flowing through the UV reactor is exposed to UV rays.
2) Electric / Control panel: It contains the electrical-electronic equipment necessary for the operation of the UV lamps and control / monitoring of the system.

For the disinfection to be successful with UV rays, the following conditions must be met:
1. The UV device must produce a UV beam of sufficient intensity at a wavelength of 254 nm.
2. The microorganisms need sufficient time contact with UV rays.
3. Special UV sensors should be installed on UV devices
4. For the destruction of microorganisms, water disinfection works with the highest efficiency in clear waters that are well filtered.

UV light is not a radioactive beam, it has no permanence or permanent effect.

Assembly places in the application;
The UV device can be installed while the well water supplied to the tank by chlorine outlet or chlorine is delivered to the facility.
For dialysis systems, it is appropriate to pass the water produced with reverse osmosis device through the UV device before dialysis devices.
In the drinking water bottling plants, it is appropriate to use the UV device after the last filtration.
In the pharmaceutical, chemical and cosmetic industries, UV disinfection is applied before the use of pure water.
In the pharmaceutical, chemical and cosmetic industries, UV disinfection is applied before the use of pure water.
UV device can be applied for additional security against various microorganisms that have resistant to chlorine.
Bacterial growth on membranes can be prevented by using UV before reverse osmosis membrane systems.

Advantages of UV:
UV is environmentally friendly, no chemicals or waste.
It does not change the chemical properties of water (such as conductivity, pH) as it is not supplied with chemicals.
It disinfects regardless of the pH value and the temperature of the water.
It does not form carcinogenic by-products in water.
Operating costs are low.
Its operation, control and maintenance is simple.

Inspection and Maintenance:
The life of UV lamps is on average 8000 - 9000 hours. UV lamps must be replaced when the time comes.
The cleanliness of protective quartz glasses in UV devices should be considered.