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1. TSP (Trisodium phosphate) 2. Sodium salt of EDTA (Ethylenediaminetetraacetic as powder 20.0 kg (44 lb) 1L 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/m, of water (3.6 to 7.2 gaF264.2 gal). (From Fluid Systems Cleaning Instructions for ROGA Elements, 1990) 8.1.7 Hydrunautics. - Hydranautics has a set of recommended cleaning solutions for each membrane type. The general procedure is as follows: l Mix a fresh batch of cleaning solution in the cleaning tank using~ clean permeate water. l Circulate the cleaning solution through the pressure tubes for approximately 1 h the desired period of time, at a flow rate of 133 to 150 Ymin (35 to 40 gal/min) per pressure tube for 8.0- and 8.5-m. pressure tubes or 34 to 38 L’min (9 to 10 gal/mm) for 4.0~in. pres- sure tubes. l After completion of cleaning, drain and flush the cleaning tank, then fill the cleaning tank with clean permeate water for rinsing. l Rinse the pressure tubes by pumping clean product water from the cleaning tank (or equivalent source) through the tubes to the drain for several minutes. l After the RO system is rinsed, operate it with the product dump valves open until the product water flows clean and is free of any foam or residues of cleaning agents (usually 15 to 30 mini. 8.1.7.1 Cellulose acetate blend RO membranes. Cellulose acetate blend membranes will bc severely damaged if exposed to high or low pH conditions for a prolonged period. If the RC system is to be out of service for more than 1 day, the pH of the rinse water should be adjust. ed to approximately 5.6. as 39 percent 3. T&on X-100 4. Adjust pH with H,SO, (sulfuric acid) or HCl (hydrochloric acid.) as follows after mixing chemicals with product water. HR elements should be cleaned at 7.0. SD, S, and LP elements should be cleaned at a pH of 8.0. solution Acid) 8.0 kg (17.5 lb) 20.0 kg (56.5 lb)PDF Image | DESALTING AND WATER TREATMENT MEMBRANE
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