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WEFTEC®.06 the electrolysis process. • Dosing pumps with dosing controls: Provides the needed disinfection dose based upon the chlorine residual or flow rate of a receiving stream. • Cell cleaning system: Used to remove the calcarious material deposited on the cell cathodes during the production process. • Central control panel: Performs the system production control function. Figure 1. Typical On-Site Sodium Hypochlorite System (http://www.clortec.com). A simple on-site generation system operation begins with the client’s domestic water supply flowing through the water softener where the water hardness is reduced. A portion of the softened water is added to the salt dissolver to make a concentrated salt brine solution of approximately 300 grams/liter. The concentrated salt brine is then mixed with the main stream of softened water to produce a final brine concentration of approximately 3% (30 grams/liter) salt concentration. This final brine solution is then pumped through the electrolyzer cell. The cell electrolyzes the final brine solution into sodium hypochlorite as per the following equation: NaCl+H2O+2e = NaOCl+H2 3.5 lbs + 15 gal. + 2.5 KwH = 0.8 % NaOCl The sodium hypochlorite solution produced by the electrolyzer is then forced by the incoming water pressure to flow to the storage tank. Sodium hypochlorite from the storage tank is used as a supply source for dosing pumps. These pumps are operationally controlled by either a residual analysis or a flow-pacing signal to supply sodium hypochlorite to the point of disinfection application. Electrolyzer cell cleaning frequency varies from one month to six months. Cell Copyright ©2006 Water Environment Foundation. All Rights Reserved 6336PDF Image | On-Site Sodium Hypochlorite Generation
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