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WEFTEC®.06 cleaning is accomplished using either hydrochloric or sulfamic acid at a concentration ranging from 5 to 10 percent. Please note, feed water total hardness should always be less than 50 mg/L as calcium carbonate in the cell feed to control monthly cathode acid cleaning. On-site generation systems are susceptible to water temperatures less than 15oC. If water temperatures are less than 15oC, the water temperature must be raised by adding some form of heat exchanger to the outlet of the cell. The inlet feed water is passed through one side of the exchanger and heated product through the opposing side. Exchangers are sized to assure that the system inlet water is heated to at least 15oC. Standard On-Site Sodium Hypochlorite Generation Equipment Electrolytic Cells - Electrolytic cells capable of producing sodium hypochlorite have been in existence on a laboratory scale for well over 100 years. Cell equipment before the invention of Dimensionally Stable Electrodes (DSA) was very inefficient, cumbersome and costly. While several anode electrode materials (e.g., carbon and platinum), were used for commercial chlorine manufacture prior to the invention of DSA, none could produce an electrolyzer cell that provided reliable on-site sodium hypochlorite generation. The dimensionally stable anode was developed by an independent scientist named Henry Beer in 1967. DSA development simplified cell designs to allow cost efficient production of sodium hypochlorite on-site. In the early 1970’s, J.E. Bennett developed an un-separated electrolyzer using the dimensionally stable anode. This cell was patented by Diamond Shamrock Corporation. Since the 1970’s, many electrolytic cell design variations have become available in the marketplace. Old Style Carbon Anode Titanium Precious Metal Coated Anode Figure 2 Dimensionally Stable Electrode (Anode) Photograph Copyright ©2006 Water Environment Foundation. All Rights Reserved 6337PDF Image | On-Site Sodium Hypochlorite Generation
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