Patent ID: 7927508
Filing Date: 2011-04-19
Classification: C02F

Abstract:
1. A cyclic process for the generation of oxyhalogens comprising at least chlorine dioxide for oxidation and the inactivation of microbiological organisms including cryptosporidium parvum in an aquatic facility, the process comprising: addition of a sulfate free radical precursor to the aquatic facility; and sustaining in said aquatic facility an effective amount of a catalyst that converts the sulfate free radical precursor to a sulfate free radical anion at a concentration no greater than 2.0 ppm, a halogen anion selected from at least one of a chloride or bromide, and a chlorite anion at a concentration from 0.1 to 100 ppm; whereby at least one of the sulfate free radical precursor and sulfate free radical reacts with the halogen anion to produce a free halogen donor, subsequent reaction of the free halogen donor with the chlorite anion to produce and sustain a chlorine dioxide concentration of about 0.1 to 20.0 ppm with a pH about 6.0 to 8.0; and wherein at least some portion of the recovered halogen anions and chlorite anions are recycled in the process.