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Sanitization agent Peracetic acid W&W Hydrogen peroxide W*O& Sodium hypochlorite’ INaOCI) Formaldehyde fHCHO\ Polyamide thin film composite RO 400 mg/L typical’, up to 2000 mg/L 2 h contact 63 400 ma/L up to 2500 mg/L’ 2-12 h contact pH 3-4 not compatible 0.5.3%4 0.5-Z h mntact PolysuHone composite 400 mg/L 2 h contact PH 4 not compatible thin RO film Table 8.14. - RO and UF membrane sanitization chemicals. Cellulose 400 mg/L 2 h contact pH 4.5 acetate Polysulfone UF up to 2000 mg/L 2 h contact @I 400 ma/L 3%2 1-2 h contact DH 3-4 up to 500 mg/L 1 h contact pH 6.0-7.5 l-4% 0.5-2 h mntacl up to 100 mglL Cl, l-2 h contact PH 6.0-7.5 1.4% 0.5-Z h contact up to 2000 mg/L 2 h contact OH 4.5 up to 10 mg/L Cl, l-2 h contact pH 6.0-7.0 l-4% 0.5-Z h M)ntact ’ Temperature must not exceed 25 “C or membrane degradation may occur. Also, iron or other heavy metals catalyze a membrane degradation reaction. Clean with hydrochloric acid first if present. ’ Iron or other heavy metals catalyze a membrane degradation reaction. Clean with hydrochloric acid first if present. ’ Do not use pH below 5.5 because chlorine gas will be liberated. 4 Do not use formaldehyde with polyamide thin film composite membranes until cartridges have been operated for at least 6 h or severe flux loss may OCCW. Table 8.15. - Sanitizing procedures for Koch hollow fiber membranes. Sanitizing RECOMMEtiDED PROCEDURE HF132.20.PM10 HF 132.20.GM80 200 mglL NaOCL or 5% Hydrogen peroxide _.. Agents HF132.20.PM10 200 mg/L NaOCL or 5% Hydrogen peroxide or 95°C water FOR SANITIZATION AT 95 “C OF 1. Continue to,permeate. 2. Reduce the feed pressure to 35 kPa. 3. Heat inlet water up to 95 OC et a rate of approximately 4. Continue to permeate water to drain for 30 min. 5. Reduce temperature to ambient at a rate of approximately 2 Wmin. 8.1.10 RhSne Pdenc. - F&one Poulenc’s KerasepW monolithic ceramic microfdtration membranes are the most durable of any membranes considered in this manual. They can withstand 5,000 kPa, a pH range from 0 to 14, and process temperatures up to 400 “C. They are not affected by oxidants or solvents and can be steam cleaned at 125 “C for 40 min. Most any cleaning solution recommended by the other membrane producers would work for these membranes as well. Their sirconia/titanium oxide ultrafiltration membranes, which operate at pressures up to 1,000 kPa, can also tolerate high temperatures and extreme pH and oxidizing conditions. 2 Wmin.PDF Image | DESALTING AND WATER TREATMENT MEMBRANE
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