METHOD OF THOROUGH PURIFICATION OF WATER Russian patent published in 2002 - IPC

FIELD: methods of multi-stage purification of natural water in open and underground sources; domestic water supply systems. SUBSTANCE: proposed method includes ultrafiltration followed by microfiltration and treatment with ultra-violet radiation; to this end, water is passed through reactor containing pulse continuous spectrum xenon lamps mainly generating ultra-violet radiation at length of wave of 200 to 400 nm, frequency of 1 to 1.3 Hz, specific power requirements of 1 to 3 kJ/cu. m density of flow of 1 to 3 kW/sq/m; then water is directed for sorption purification in charcoal filter treated preliminarily with 0.1 to 1.0-% solution of argentums salt Ag₂SO₄ or AgNO₃ at addition of gaseous ammonia or ammonia water till Ag⁺:NH₃, mass ratio of 2.8 to 3.0 has been attained; addition of gaseous ammonia of ammonia water is accompanied by continuous mixing; said solution of complex argentums compound is regularly introduced into water being treated by means of proportioner before ultrafiltration at content of argentums ions of 0.005 mg/1 and before microfiltration at content of argentums ions of 0.002 mg/1. EFFECT: extended field of application; enhanced operational reliability and ecological safe method ensuring protracted operation without biological fouling of membranes and sorbent; avoidance of secondary biological contamination of water during extended period of time (no less than month). 7 cl, 1 tbl, 2 ex