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Table 8.7. - Performance of recommended cleaning solutions for different types of fouling. A. 8. C. D. Slightly Soluble lnorgamc Metal Oxides (iron) Salts BtST OK OK OK GOOD OK GOOD Inorganic Silica Biofilms Organics Colloids (Siit) GOOD GOOD GOOD GOOD GOOD OK BEST OK Examples of slightly soluble inorganic sahs ate C&O,, Calcium Carbonate; CaS04, Calcium Sulfate; and B&O,, Barium Sulk&. Consult a FILMTEC representative if a more effective cleaner is needed for silica. (Technical EWetin - FILMTECB Membranes - Cleaning Procedures for NLMTECB FT30 Elements, 7/91.) 8.1.6.1 Polyamide Z’FCL elements. Polyamide TFCL elements may be cleaned with anionic or non-ionic surfactants. Cationic surfactants are not recommended because they may cause irreversible fouling. Fluid Systems recommends two cleaning solutions that must be prepared with water free of residual chlorine or other oxidizing agents: Solution Ll: used to remove acid soluble substances such as metal hydroxides and calcium carbonate. It should generally be used before using Solution L2 if both solutions are used. Per cubic meter of water (264.2 gal), 1. Citric acid 10.0 kg (22.1 lb) 2. Adjust pH to 2.5 with NH,OH (ammonium hydroxide) Solution L2: used to remove organic substances and microbiological slimes. Per cubic meter of water (264.2 gal) I. STPP (Sodium tripolyphosphate) 2. Sodium salt of EDTA (Ethylenediaminetetraacetic as powder Acid) 10.0 kg (22.1 lb) 10.0 kg (22.1 lb) 25.6 kg (56.5 lb) 10.0 kg (22.1 lb) as 39-percent solution 3. TSP (Trisodium phosphate) 4. Adjust to a pH of 10 to 11 with HCl (hydrochloric acid.) (From Fluid Systems Cleaning Instructions fir TFCL Elements, 1992) 8.1.6.2 Polyether urea TFC membranes. Polyether urea TFC elements may be cleaned with cationic or non-ionic surfactants. Anionic surfactants are not recommended because they may cause irreversible fouling. Fluid Systems recommends two cleaning solutions, Y and Z, that must be prepared with water free of residual chlorine or other oxidizing agents. RO permeate should be used for seawater application, but treated feedwater may be used for brackish water applications.PDF Image | DESALTING AND WATER TREATMENT MEMBRANE
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