Water Purification by a Lamp Discharge-Electronic Ballast System Using a Full Bridge Inverter

Abstract

The presence of pathogenic microorganisms in the water poses a risk to the health of consumers of all ages. Water conventional chemical treatments are not always a good solution. Difficult to implement, they have the double disadvantage of denaturing the organoleptic qualities of water: by acting on its physico-chemical composition and rejection of polluted water. Chlorination treatment is generally used to solve the bacteriological quality problems of both unconventional drinking water and treated wastewater. The use of chlorination is increasingly avoided due to the production of chlorinated products of carcinogenic and to the little action on the virus. The search for alternative solutions has summarized in several studies. The use of "ultraviolet irradiation" is still interesting alternative solution. Sterilization system using UV radiation is recommended in health services, hospitals, pharmacies, agriculture, aquariums, water extraction fromwells orrainwater, etc. UV radiationhas a fast acting, efficient, safe and constitutes an economic process that respects the environment. In recent years, high-frequency electronic ballasts for discharge lamps have been presented as a substitute for the magnetic ballast. because of their superior qualities such as high system performance (improved power factor), weight light, the light produced per watt, long service life, the function of lighting control, non-flashing, non-presence of audible noise and more technical aspects and requirements, special attention must be given to costs of an electronic ballast. This paper presents the design of a high frequency current power supply (electronic ballast based PWM inverter) to power a low-pressure UV lamp Mercury-Argon which has a germicidal effect for water treatment. So, the main purpose is to generate maximum UV at 253.7 nm (germicidal effect) and this is achieved by having at the ballast output a sinusoidal current with a frequency of 50 KHz and rms value of 0.65 A.