| 摘要 |
<p>A method of chlorinating water comprises producing either chlorine gas or an aqueous solution of active chlorine by electrolysis of a chloride solution at the place of chlorinating the water, the chlorine being added continuously thereto in an amount depending on a determined property of the water which has been chlorinated substantially immediately before, said amount being controlled by varying the current for electrolysis. The current control is preferably carried out automatically. The chlorine gas may be dissolved in the electrolyte, and the electrolyte be added to the water to be chlorinated. Alkali metal hydroxide and hydrogen formed during electrolysis may also be dissolved in the electrolyte. During periods of interruption of the treatment a voltage equal to or lower than the decomposition voltage of the electrolyte. A suitable cell described comprises a cast-iron <PICT:1056024/C6-C7/1> tubular casing 11 serving as cathode, having concentrically arranged therein a bar of magnetite 12 which forms the anode, the ends of the cell being formed by insulating members 16, 17. The cell is provided with inlet 24 and outlet 26 Fig. 2, (not shown) for the electrolyte and with outlet 25 for hydrogen gas formed during electrolysis. The method may also be used in processes in which materials dissolved or dispersed in water, e.g. cellulose fibres are to be chlorinated.</p> |
