With the ultraviolet device, disinfection is achieved by the formation an electric arc in a glass tube containing a special gas, the evaporation and ionization of mercury by the heat produced, and the resultant ultraviolet beams. The UV beam provides 99,8% sterilization by penetrating the cell walls of the microorganisms in the water and breaking their DNA. The wave length range that allows for maximum disinfection effect in the ray spectrum is between 240 – 280 nm. This range is within the spectrum of rays known as UV-C. The most effective disinfection is achieved with rays at 254 nm wave length. Lamps used in UV units contain mercury vapour and have low or medium pressure. When a certain amount of voltage is applied at the anode-cathode ends of the lamp, mercury vapour starts to radiate by the resulting ignition. Main advantages of UV Disinfection:
- Most viruses neutralize spores and cysts.
- It is a physical method, not a chemical one. It does not contain any toxic/dangerous or abrasive chemicals,
- It does not change the chemical properties of water and does not leave any residue, • Easy to install, use and maintain
- The action periods are short (around 10-20 seconds),
- Takes up less space,
- Low investment and operation cost, Areas of Use for Ultraviolet Devices:
- Drinking water – public or private,
- Waste water disinfection,
- Preparation of product and process water,
- Preparation of syrup, starch and salty water,
- Swimming pools and spas,
- Fish production farms,
- Fighting with Legionella,
- Disinfection of ballast water in ships. Chemical Dosage Systems Standard dosage units with capacity of 3.47 lt/hr and 2.2 lt/hr, 7 bar are available. They are diaphragm dosage pumps with electronic control. Polyethylene solution tanks resistant to the effects of standard 100 lt chemical material are included in the dosage unit. Fixed, proportional or analogue controlled chemical dosage is possible. High capacity dosage pumps and large volume solution tanks can be supplied on demand.