USF RO ManualOMRX_6.pdf

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RX Manual 04/04 Rev. 6 SYSTEM MAINTENANCE A. Different Sanitizing Agents 1. Peracetic Acid (Preferred Method) Advantages of using peracetic acid are that it has no toxic vapors, is biodegradable, easily disposable, and has good biocidal activity. Peracetic acid decomposes into oxygen, water, and acetic acid. Several peracetic acid solutions are commercially available, including; Minncare and Renalin Dialyzer Reprocessing Concentrate, both products of Minntech Corporation, and P3-Oxonia Active, a product of Henkel Corporation. For ordering information call the number provided on the cover of this manual. 2. Hydrogen Peroxide Advantages of using hydrogen peroxide are that it has low toxic vapors, is biodegradable, is easily disposable, has good biocidal activity, and breaks down into oxygen and water. B. Selecting a Sanitant Table 4-1 lists the type and concentration of sanitizing agent that should be used for polyamide thin film composite membranes, as well as the minimum contact time for sanitization. Table 4-1: Sanitization Times and Concentrations for Polyamide TFC Membranes. Sanitant Sanitant Concentration Sanitant Contact Time Peracetic Acid * up to 400 ppm (0.04%) 60-120 minutes Hydrogen Peroxide * up to 2,000 ppm (0.2%) 60-120 minutes * When using hydrogen peroxide or peracetic acid with thin film composite membranes, the temperature should not exceed 25° C (77° F). Also, the presence of iron or heavy metals can cause membrane degradation. Clean the membranes first if iron is present in the feed water. USFilter 4-2
RX Manual 04/04 Rev. 6 SYSTEM MAINTENANCE C. Testing for Residual Sanitant After flushing the sanitant from the RO system, the product water should be checked for residual levels of sanitizing agent before the system is placed back on line. Use the following guidelines to determine if the system is clear of residual sanitizing agents. 1. Peracetic Acid The product water should be analyzed with the Peracetic Acid Residual Test Strip or other peracetic acid test kit. For ordering information call the number provided on the cover of this manual. 2. Hydrogen Peroxide The product water should be analyzed with a hydrogen peroxide test kit. D. Methods of Sanitization Sanitization is most effective when the RO system is operating at normal pressure and flows. This allows the maximum amount of sanitant to penetrate through the membrane, ensuring adequate sanitization of the product side of the system. In addition, sanitant should contact all wetted components of the RO system including prefilter housing, valves, flowmeters, and sample ports to ensure maximum effectiveness. Recirculation Method This method requires an accessory tank and booster pump clean in place (CIP) system US Filter model number MEDROCIP or equivalent system. A sanitant solution is prepared in the tank and fed to the RO system via the booster pump. The product and reject streams are diverted to the tank and the sanitant is recirculated through the system for a period of time. The advantages of the recirculation method of sanitization are minimal usage of chemical, and ease in obtaining the proper sanitant concentration. In addition, the accessory tank and booster pump may also be used for system cleaning. The following steps provide a general guideline for the recirculation method of sanitization. a. The RO system is put into sanitization lockout mode. During sanitization lockout the RO system will not run. b. A batch of sanitant, typically 15 to 50 gallons (60 to 200 liters) for the RX series RO systems is prepared in the CIP tank by diluting the sanitization chemical with pretreated RO feedwater or RO product water, following the sanitant chemical manufacturer’s recommendation. c. Connect the cleaning CIP skid to the RO system. The product and reject lines are diverted back to the CIP tank. Use the RO USFilter 4-3
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