Patent ID: 8444860
Filing Date: 2013-05-21
Classification: C02F

Abstract:
1. A method for disinfecting hot water in recirculating systems, comprising producing monochloramine directly in hot water at a temperature between about 30° C. and about 65° C. in a hot water circulating system, the producing of said monochloramine including adding chlorine or chlorites and ammonia or ammonia salts to said hot water; maintaining said monochloramine produced in said hot water at a constant concentration throughout the entirety of said hot water circulating system; controlling concentrations of by-products, including ammonium ion, of a reaction between said chlorine or chlorites and said ammonia or ammonia salts by continuously or constantly monitoring levels of monochloramine and ammonium in said hot water circulating system and, depending on detected levels of monochloramine and ammonium in said hot water circulating system., regulating the addition of said chlorine or chlorites and said ammonia or ammonia salts; and adjusting the pH of said hot water prior to or upstream of the adding of said chlorine or chlorites and said ammonia or ammonia salts.