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CHEMICALS ++ = Preferred + = Effective 0.5% (V) HCI. pH 2.3 min. ’ 0.5% (W) H,PO,, oH 2.3 min. 0.2% (w) Nti,SO,H pH 2.3 min. 2.0% IW) Citric Acid PH 4 &v/NH~oH) Foulants Sparsely Soluble Metal Oxides FOULANTS Inorganic Colloids Biological Matter Organics Silica Table 8.5. - Chemical cleaning agents for du Pont Permasep permeators. inomanic ++ + + + salts + + + 2.0% (w) Ciiric Acid 2.0% (W) Citric Acid 2.0% (W) N+EDTA pH 4.0 (w/NH,OH) + + 1 I+l + I I I I I I I + oH9fw/NH,OH) I I I I I I 1 .o% (W) 1.O% (w) TSP 1.O% (W) N+EDTA + + STP 1.O% (W) 0.1% (W) NaOH pH 11.0 max. * 1.O% (W) N&O, 0.3% (W) Na Perborate 0.25% (w) Na-DES pH 10.0 2.0% (w) Na STP 0.25% (W) Na-DBS pH 10.01 1.0% (W) NaHMP 0.5% (V) NaOH oH 11.0 max’ ++ ++ N%EDTA + ++ + + + + ++ 500 h over the lite of the permeator. Permeators must not be exposed to pH >ll .Q. Abbreviations: HCI - Hydrochloric Acid; H,PO, = Phosphoric Acid; NH,CO,H = Sukmic Acid; Citric Acid is C3H4(0H)(COzH)3; NH40H is Ammonium Hydroxide; Na,EDTA = Disodium Salt of Ethylenediamine Tetraacetic Acid; Na-DES = Sodium Salt of Dcdecylbenzene Sulfonic Acid; Na-perborate = NaBO,*4H,O; STP - Sodium Triphosphate NaSP30,,; TSP = Trisodium Phosphate Na3P0,*12H,0. ++ + + + + + 1, The pH in the permeator must be 24.0 for continuous operation. The maximum allowable exposure time during operation and cleaning for Solutions with pH 2.3 to 4.0 is 100 h over the life of the permeators. Permeators must not be exposed to pH <2.3. 2. The pH in the E-10 permeator must be <9.0 for contiriuous operation. For cleaning, the permeator can be exposed to pH 9.0 to 11.Ofor an unlimited period of time. For the E-9 permeator for continuous operation the pH must bePDF Image | DESALTING AND WATER TREATMENT MEMBRANE
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