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WEFTEC®.06 cathodic eledtrode. The water softener contains a cation (negatively charged resin) exchange resin which is the same as used in home water softeners. Water hardness may expressed as grains per gallon. One grain per gallon is equal to 17.1 parts per million (ppm) per grain. For example, water with 10 grains of hardness will be equal to 171 parts per million. On-site generator manufacturers provide the water softener with their equipment to assure the customer will achieve long reliable cell electrode service from the cell electrodes. Softeners also reduce the need for chemical cleaning since a significant portion of the calcium material is resident in domestic potable water rather than the salt used in the electrolysis process. An example of water softener importance is as follows. The water has 100 mg/l hardness and the salt has 1,500 mg/l for the cell feed material. The salt is dissolved to a 30% solution to form a solution hardness 550 mg/l, 1500 mg/l x 0.3 + 100 mg/l. This solution is then further diluted by a 10:1 ratio therefore the salt contributes 55 mg/l (1/10th of 550 mg/l) and the water contributes 100 mg/l. As you can see above the electrolyzer cell is exposed to 3 times the hardness when no water softener is installed in an electrolyzer system. Salt Storage-Dissolver Tanks - Salt dissolver systems are designed to meet a myriad of sizes, brine demands and filling methods. Dissolver units are available in three designs to meet sizing needs. These units vary from tank type dissolvers, as shown in Figure 9, to high capacity pit dissolvers. Smaller system dissolvers are sized for 3 to 7 days between refills while large dissolver systems are designed for a minimum of 15 days storage to minimize delivery requirements. Level control systems use float assemblies or electric conductance probes to control salt dissolver water addition using one of the following: • Float type systems • Conductance probes are inserted in a stand pipe assembly on the outside of the tank via a flange near the bottom of the tank. Copyright ©2006 Water Environment Foundation. All Rights Reserved 6345PDF Image | On-Site Sodium Hypochlorite Generation
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