USF RO ManualOMRX_6.pdf

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RX Manual 04/04 Rev. 6 SYSTEM MAINTENANCE Table 4-2: Cleaning Solutions for Polyamide Thin Film Composite Membranes. 0.1% (W) 1 NaOH and pH12, 30°C max. or 1.0% (W) Na4EDTA and pH12, 30°C max. 0.1% (W) 1 NaOH and pH12, 30°C max. or 0.025% (W) NaDSS and pH12, 30°C max. 0.1% STP and 1.0% (W) 1 Na4EDTA or 1.0% TSP and pH12, 30°C max. Inorganic Salts 2 Metal Oxides (Iron) 0.2% (W) 1 HCl BEST 0.5% (W) 1 H3PO4 OK GOOD 2.0% (W) 1 Citric Acid OK 1.0% (W) 1 Na2S2O4 GOOD NOTES: 1. (W) Denotes weight percent of active ingredient. Inorganic Colloids (Silt) Silica Biofilms Organics OK BEST OK GOOD GOOD GOOD GOOD GOOD 2. Inorganic Salts: CaCO3=Calcium Carbonate; CaSO4=Calcium Sulfate; BaSO4=Barium Sulfate. 3. Cleaning chemical symbols: NaOH=Sodium Hydroxide; Na4EDTA is the Tetrasodium Salt of Ethyl Diamine Tetraacetic acid; NaDSS is Sodium Salt of Dodecylsulfate; STP is Sodium Triphosphate (Na5P3O10); TSP is Trisodium Phosphate (Na3PO4·12H2O); HCl is Hydrochloric Acid; H3PO4 is Phosphoric Acid; C3H4(OH)(CO2H)3 is Citric Acid; Na2S2O4 is Sodium Hydrosulfite. USFilter 4-8
RX Manual 04/04 Rev. 6 SYSTEM MAINTENANCE 4.4 MAINTENANCE SCHEDULE NOTE: The maintenance schedule for monitoring outlined is a minimum for the protection of the RO system. A more frequent monitoring schedule may be necessary. Consult your local USFilter representative or call USFilter, Technical Support Department at the number provided on the cover of this manual for assistance. Refer to the RO Data Collection Form in the Appendix. A. Feed water 1. Check pressure daily; record weekly. Adjust as necessary to maintain 35 to 80 psi. 2. Monitor feed and product conductivity and record weekly. 3. If there is a possibility of the presence of chlorine in the feed water, measure free chlorine weekly. (It must be non-detectable or the membranes may be damaged). 4. If there is a possibility of significant pH variations (i.e. the feed is pH controlled) monitor and record pH weekly by independent pH meter or litmus paper. 5. Measure total hardness monthly. 6. Measure total alkalinity monthly. B. Prefilter 1. Measure differential pressure daily; record weekly. 2. Change prefilter cartridge when the differential pressure is greater than 10 psi or every month, whichever occurs sooner. C. Pump 1. Check pressures daily; record weekly. 2. If the pressures have fallen off, check product, reject and reject recirculation flow rates. D. Conductivity 1. Observe feed and product conductivity daily; and record weekly. 2. Record percent salt rejection weekly. Conductivity Feed - Conductivity Product 100 X = % Rejection Conductivity Feed E. Flow Rates 1. Check daily and record product and reject flow rate weekly. 2. Calculate the percent recovery using the following formula: USFilter 4-9
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Page 9 and 10: RX Manual 04/04 Rev. 6 INTRODUCTION
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