Patent ID: 7927509
Filing Date: 2011-04-19
Classification: C01B

Abstract:
1. A cyclic process for the conversion of a dilute solution of chlorite anions to chlorine dioxide in an aqueous system for enhanced inactivation of microbiological organisms, the process comprising: addition of an activating oxidant selected from at least one of a free halogen donor comprising some portion of free chlorine and peroxymonosulfate donor to the aqueous system; and obtaining in said aqueous system a bromide anion concentration from about 5 ppm to 1000 ppm, a chlorite anion concentration necessary to sustain from about 0.1 to 20 ppm as chlorine dioxide, and a pH of between about 6.0 to 8.5; whereby the activating oxidant reacts with the bromide anion to sustain a free bromine concentration from about 2.25 to 50 ppm reported as Br wherein at least some portion of the recovered bromide anions and chlorite anions resulting from the reduction of free bromine and chlorine dioxide are recycled in the cyclic process.