Method for onsite production of chlorine dioxide

#The present disclosure generally relates to a method of treating process water using a reactor for generating chlorine dioxide onsite.

#Industrial water systems are subject to various sorts of fouling. Fouling can occur in the form of mineral fouling, biological fouling, and often combinations of the two. In fact mineral fouling often provides an anchor and substrate for biological infestations, and some organisms leach or secrete minerals onto industrial water system surfaces.

#Fouling may occur as a result of a variety of mechanisms including deposition of air-borne and water-borne and water-formed contaminants, water stagnation, process leaks, and other factors. If allowed to progress, fouling can cause a system to suffer from decreased operational efficiency, premature equipment failure, loss in productivity, loss in product quality, and (in particular in the case of microbial fouling) increased health-related risks.

#A detailed description of the invention is hereafter described with specific reference being made to the drawings in which:

#FIG. 1 shows a configuration for feeding concentrated reactants into a tank;

#FIG. 2 shows a configuration of separately diluting concentrated reactants before feeding to a tank;

#Various embodiments are described below. The relationship and functioning of the various elements of the embodiments may better be understood by reference to the following detailed description. However, embodiments are not limited to those illustrated below. In certain instances details may have been omitted that are not necessary for an understanding of embodiments disclosed herein.

#In some embodiments, a method is provided for treating process water in a cooling tower. The method may include the step of determining certain conditions or properties of the process water such as the chlorine dioxide level, oxidation reduction potential (ORP), pH, flow rate of any feed or injection streams, or fluid levels in any tanks. The method may include feeding an acid through a first feed line into a diluent stream in a diluent line or a solution in a tank. Another reactant, such as chlorate salt, may be fed through a second feed line into the diluent steam or the solution in the tank. Finally, the method may include injecting the diluent stream or the solution in the tank into the process water.

#In some embodiments, the method may involve asynchronously feeding the acid and feeding the chlorate salt into the diluent stream or the tank.