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Table 9.11. - Summary of recommended cleaning solutions for Hydranautics composite o&amide Solution 1 2 4 RO membranes. Ingredient Citric acid RO permeate (chlorine-free) Sodium tripolyphosphate Tetrasodium EDTA (Versene 220 or equal) RO permeate (chlorine-free) Sodium tripolyphosphate Sodium dodecylbenzene- sulfonate Quantity per 379 L (100 gal) 7.7 kg (17 lb) 379 L (100 gal) 7.7 kg (17 lb) 3.18 kg (7 lb) 379 L (100 gal) 7.7 kg (17 lb) 0.91 kg (2.13 lb.) pH adjustment Adjust to pH 4.0 with sodium hy- droxide (NaOH) Adjust to pH 10.0 with sulfuric acid (Has04 Adjust to pH 10.0 with sulfuric acid (HaSO, RO oermeate (chlorine-free) (From Hydranaotics Technical Service Bulletin TSB 107.00, April 1992) 379 L (100 aal) 8.1.7.3 PVD (Polyvinyl derivative) RO membranes. Use of cationic or nonionic surfactants with Hydranautics PVD membranes may result in flux decline. Table 9.12. - Polvvfnvl derivative RO membrane element foulant symptoms Foulant 1. Calcium precfpttates (carbonates and phosphates, generally found a1 the concen- trate end of the system) 2. Hydrated oxides (iron, nickel, copper, etc.) 3. Organic deposits 4. Bacteria fouling General symptoms Response A marked decrease in salt rejection and Chemically clean the system a moderate increase in AP between feed with Solution 1. and concentrate. Also, a slight decrease in system production. A rapid decrease in salt rejection and a Chemically clean the system rapid increase in AP between feed and with Solution 1. concentrate. Also, a rapid decrease in system production. Possible decrease in salt rejection and a Chemically clean the system gradual increase in AP between feed with Solution 2. and concentrate. Also, a gradual decrease in system production. Possible decrease in salt rejection and a Chemically clean the system marked increase in AP between feed with Solution 2. and concentrate. Also, a marked decrease in system production. Note: All problems require the cause of (From Hydranautics Technical Service Bulletin TSB 102.00, April 1992) the fouling to be corrected. Contact Hydranautics for assistancePDF Image | DESALTING AND WATER TREATMENT MEMBRANE
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