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8.1.5 Filmtec. - Filmtec has a variety of recommended cleaning solutions for the FT30 aromatic polyamide TFC membranes. Table 8.6 is from their technical bulletin on Cleaning Procedures for Filmtec FT30 Elements. Table 8.7 is a relative rating of the different cleaning solutions for various purposes. Cationic surfactants are not recommended for Filmtec elements. Table 8.6. - Cleaning solutions for the FT30 membrane. SOLUTION A. B. C. D. COMPOSITION 0.1% NaOH 0.1% NaEDTA pH 12. 30°C max 0.1% NaOH 0.05% NaDSS oH 12. 30°C mar. 1.O% STP 1.O% TSP 1.0% Na.EDTA 0.2% HCI SOLUTION COMPOSITION E. 0.5% H,PO, F. 2.0% Citric Acid G. OZ%NH,SO,H H. 1.O% NaAO, Percents are by weight of active ingredient. Chemical compounds: NaOH is Sodium Hydroxide; N~EDTA is the tetra-sodium salt of ethylene diamina tetraacstic acid; Na,DSS is the sodium salt of dodecylsulfate; STP is sodium triphosphate (N%P,O,,); TPS is trisodium phosphate (Na3P0,*12H,0); HCI is hydrochloric acid; H,PO, is phos-phoric acid; citric acid is C,H,(OH)CO,H),; NH,SO,H is sulfamic acid; Na,S,O, is sodium hydrosutliie. (Technical Bulletin - FILMTECB Membranes - Cleaning Procedures for FILMTECB FT30 Elements, 7/91.) 8.1.6 FZuid Systems. - Fluid Systems recommends the following cleaning solutions for temperatures up to 40 “C (104 “F) for 45 min at the appropriate rate for the tube diameter. (3 gaYminI (10 gal/min) (20 gal/min) (40 gal/min) 2.5 in 4 in 6 in 8 in 0.7 m3/h/tube 2.3 m3/h/tube 4.6 m3/h/tube 9.1 m3/h/tube The system pressure should be the minimum required to achieve the specified flow but the pressure drop across any vessel should not exceed 414 kPa. Pressure tubes should only be cleaned in parallel so that the reject from one tube is not used to clean another. If stages of pressure tubes are used, each stage must be cleaned separately. Contact the Technical Services Department at Fluid Systems if cleaning does not restore system to expected capacity or water quality, or for advice on alternative cleaning solutions.PDF Image | DESALTING AND WATER TREATMENT MEMBRANE
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