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For sanitization, one of the following solutions should be circulated through the system for 30 to 60 minutes after cleaning and rinsing: l Up to 200 mg/L sodium hypochlorite. l Up to 3 percent formalin. l 100 to 200 mg/L peracetic acid. l Up to 0.5 Normal sodium hydroxide. l Up to 70 percent ethanol in water; or l Autoclave. If properly cleaned, 10 mgiL should be sufficient. All AGT UF and MF cartridges with Housing Sizes 3, 4, 4x2TC, 5, 6, 8, and 9 are autoclavable. Larger UF and MF cartridges that have the suffix “A” in their model number are also autoclavable (e.g., UFP-100-E-35A). The procedure for autoclaving is as follows: l Wet the cartridge with water by filling through the permeate ports. l Place the cartridge in an autoclaving bag. l (Optional) Run autoclave with three pre-vackteam purge cycles. l Autoclave at 121 “C for 30 min. Be certain autoclave temperature does not drift above 123 “C. A 30-min cycle is typically sufficient; up to 2 h is acceptable. l Slow exhaust without vacuum for 30 min. . Allow SLOW cool down of cartridge, ideal case is overnight. If not possible, allow at least 3 h to cool. Note: Cartridge life is a function of autoclave temperature, cycle time, and number of cycles. MF and UF cartridges with housing sixes 35A and 55A are guaranteed for two autoclave cycles. Other autoclavable MF cartridges are guaranteed for three cycles and other UF cartridges are guaranteed for two cycles. In practice, strict attention to proper autoclave procedures may permit well over 10 cycles per cartridge. It is prudent to have a spare cartridge available should cartridge life be exceeded or autoclave cycle temperature drift too high. (AGTHollow Fiber & TurboTube Ultrafiltration & Microfiltration Cartridge Operating Guide, OG01/92RO, 1992) Other considerations when autoclaving: l Flush preservative glycerol solution from new UF cartridges. At least 10 L’m’ of membrane area should be permeated without recycle and 10 I/m2 of membrane area should be flushed through on the reject side without recycle.PDF Image | DESALTING AND WATER TREATMENT MEMBRANE
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