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Solution Y: used to remove acid soluble substances such as metal hydroxides and calcium carbonate. It should generally be used before using Solution Z if both solutions are used. Per cubic meter of water (264.2 gal) 1. Citric acid 2. Adjust pH to 4.5 with NH,OH (ammonium hydroxide) Solution Z: used to remove organic substances and microbiological slimes. Per cubic meter of water (264.2 gal) 10.0 kg (22.1 lb) 10.0 kg (22.1 lb) 1. Borax 2. Sodium salt of EDTA (Ethylenedieminetetraacetic as Powder 10.0 kg (22.1 lb) Acid) as 39 percent solution 3. TSP (Trisodium phosphate) 4. The pH of this solution will be in the 10 to 11 range; it may have to be adjusted to the recommended cleaning pH range for TFC elements of 4.5 to 11. Formaldehyde may be added to either cleaning solution to aid in disinfection or removal of biological growths. Fluid Systems recommends a 0.5- to l-percent solution that is 13.5 to 27.0 L/m3 of water (3.6 to 7.2 gaF264.2 gal). (Fluid Systems Cleaning Instructions for Z’FC Elements, 1991) 8.1.6.3 Cell&sic ROGA elements. Cellulosic membranes have more tolerance to oxidants than the thin film composites. The recommended limit is 1 mg/L chlorine residual or the equivalent. Treated feedwater or RO permeate are recommended for preparing cleaning solu- tions. The following are recommended by Fluid Systems: Solution A: Used to remove acid soluble substances such as metal hydroxides and calcium carbonate. It should generally be used before using Solution B if both solutions are used. Per cubic meter of water 1264.2 gal) 1. Citric acid Phosphoric acid 75 percent 2. Triton X-100 3. Adjust pH to 2.5 with NH,OH (ammonium hydroxide) Solution B: used to remove organic substances and microbiological slimes. Per cubic meter of water (264.2 gal) 25.6 kg (56.5 lb) 10.0 kg (22.1 lb) 20.0 kg (44 lb) or 55 L (14.7 gal) 1LPDF Image | DESALTING AND WATER TREATMENT MEMBRANE
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