Abstract
High-concentration free chlorine has been used for the sterilization and disinfection of the tap water supply. Therefore, the development of a device is awaited which will enable the generation of free chlorine at high concentrations with high efficiency. The purpose of this paper is to propose an optimum operation condition for chlorine production from the standpoint of high concentration and high efficiency. Gas and liquid two-phase flow in narrow and parallel plates is investigated in the present study, where gas is generated during an experiment using chemical reactions. The experiment is conducted by flow-type reactor, because of its advantages for the maintenance and continuous generation. The governing factors are the interval between the electrode plates and flow rate of a sodium chloride solution from the viewpoint of hydrodynamics, and the concentration of sodium chloride of a medium and current density supplied to the electrode from the standpoint of chemical reactions. The experimental device is composed of a titanium electrode plate with a thin coat of platinum. In the experiment, the available chlorine concentration is measured for the above experimental conditions. However, many experimental conditions are expected for the above conditions. Therefore, the experimental condition was systematically exploited. The production efficiency was evaluated from the geometric and chemical standpoints. As a result, the high-concentration production of available chlorine was affected by the current density and sodium chloride concentration. In addition, the high concentration was affected by the flow velocity of sodium chloride solution, while the high efficiency was more affected by the flow rate of sodium chloride solution. These results will be useful to produce chlorinated water, called hypochlorous acid water, with high efficiency.
Published Version
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