Patent ID: 6500312
Filing Date: 2002-12-31
Classification: C02F

Abstract:
A method of UV irradiation for disinfection of flowing liquids, comprising the steps of:a. passing a liquid in the form of treated wastewater through an irradiation chamber comprising a plurality of UV modules each including a UV lamp controlled by an electrical input; b. measuring the UV radiation output of said UV modules; and, c. controlling the UV radiation output of said UV modules by adjusting the electrical input, in response to said measuring step b to maintain a constant UV radiation output over the operating life of said UV modules, wherein the electrical input to each of said UV lamps in said UV modules is controlled steplessly to maintain an optimized; constant UV radiation output by electrical input at a reduced value; at the beginning of the life of the modules and setting the electrical input at a reduced value continuously increasing the electrical input as the UV modules age thus extending the operating life of each of said lamps in said UV modules.