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surfactants should not be used in cleaning solutions because irreversible fouling of the mem- branes may occur. Table 8.10. - Comoosite oolvamide RO membrane element foulant svmotoms. Foulant 1, Calcium precipitates (carbonates and phosphates, generally found at the concentrate end of the system) 2. Hydrated oxides (iron, nickel, copper, etc.) 3. Mixed colloids (iron. organics, and silicates) 4. Calcium sunate (generally found General symptoms A marked decrease in salt rejection and Chemically clean the system a moderate increase in AP between feed with Solution and concentrate. Also, a slight decrease in system production. 1. clean the system 1. clean the system 2. clean the system 2. A rapid decrease in sak rejection and a rapid increase in AP between feed and concentrate. Also. a rapid decrease in system production. Chemically with Solution at the concentrate system) 5. Organic deposits 6. Bacteria fouling end of the A slight decrease in sail rejection and a Chemically gradual increase in AP between feed with Solution and concentrate. Also, a gradual decrease over several weeks in system production. A significant decrease in sail rejection Chemically and a slight to moderate increase in AP with Solution between feed and slight decrease in A marked decrease a gradual increase and concentrate. crease ,in system concentrate. Also, a system production. in salt rejection and in AP between feed Also, a gradual de- production. clean the system 2. For heavy A marked decrease a marlted increase and concentrate. crease in system production. in salt rejection and in AP between feed Chemically clean the system with Solution 4. Also, a marked de- Chemically with Solution fouling use Solution 3. Note: All problems require the cause of the fouling to be corrected. Contact Hydranautics for assistance (From Hydranau?ics Technical Service Bulletin TSB 107.00, April 1992)PDF Image | DESALTING AND WATER TREATMENT MEMBRANE
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