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9 Do not shock cartridges when fully wet or while hot. . Never expose a warm cartridge to cold process fluids. Always allow cartridge to cool completely prior to shutdown. 8.1.!2 CUNO separations systems. - CUNO Separations Systems produces a line of polyethersulfone ultrafiltration membranes. They recommend either a 1.5-percent hydrogen peroxide solution in deionized water or a 200 mg/L sodium hypochlorite solution in deionized water. The hydrogen peroxide solution should be circulated through the system for 4 h. Hydrogen peroxide levels should be checked every hour and adjusted as needed to maintain the 1.5-percent concentration. Sodium hypochlorite solution should be circulated for 30 min. The concentration of sodium hypochlorite should be checked after 15 min and more added as needed to maintain a 200 mg/L concentration. After the sanitizing solution is drained out, the system should be flushed with deionized water for at least 2 h or until trace amounts of solution have reached an appropriate level. 8.1.3 Desalination Systems, Inc. -The following cleaners and sanitizers have been evaluated by Desalination Systems, Inc., personnel and are compatible with the DESAL element types listed. Table 8.2. - Cleanina recommendations for Desalination Svstems RO membranes, CELLULOSE Foulant Mineral Scale Calcium Carbonate Calcium Sulfate Barium Sulfate Strontium Sulfate Iron or Manganese Organics. Silt, Bacterial Slime Bacteria (Sanitizers) ACETATE RO ELEMENTS Cleaners/Sanitizers . HCI, pH 3 - Pfizer Fkclean 303 . Citric acid, 2%, adjust to pH 3 with NH,OH . Trisodium Phosphate, 1% Sodium Tripolyphosphate, Sodium Dodecyl Sulfate, 0.1% Tetrasodium EDTA, 1% Adjust to pH 9.0 with HCI (See Note) . Pfizer Floclean 307 . Sodium Bisuifiie. 0.1% . Formaldehyde, 0.1% . Chlorine, 30 mg/L for 30 min l,% CAUTION: Cleaning at prematurely frequent intervals will hydrolyze the element. (From DESAL Cleaners/Sanitizers Bulletin E-22, April 1991) DSI does not approve of using sanitizers containing hydrogen peroxide and peracetic acid such as Renalin, Mincare, and P3-Cxonia for their thin film membranes. These cleaningPDF Image | DESALTING AND WATER TREATMENT MEMBRANE
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