Patent ID: 7922933
Filing Date: 2011-04-12
Classification: C02F,Y02A

Abstract:
1. A method for enhanced inactivation of microbiological organisms including cryptosporidium in an aqueous solution of an aquatic facility, the method comprising: sustaining a free bromine concentration of 1 ppm to 20 ppm as Br sustaining in said aqueous solution a chlorite anion concentration of no more than about 100 ppm to sustain a chlorine dioxide concentration from 20 ppb to 150 ppb as ClO sustaining a pH between 7.0 to 8.0; adding a sulfate free radical precursor at an average daily rate of 1 ppb to 20 ppb per minute based on the volume of the said aqueous solution; sustaining an effective amount of active catalyst that converts the sulfate free radical precursor to a sulfate free radical; and wherein at least some portion of the chlorite anions and bromide anions resulting from the decomposition of chlorine dioxide and free bromine are regenerated in-situ to form chlorine dioxide and free bromine.