MEMBRANE CHEMICALS

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OSM CO. Case Study Description: ★ Raw water derives from underground wells ★ Chemical water analysis (as ions): calcium of 785 mg/l, sulphate at 2149 mg/l, bicarbonate of 141 mg/l, with pH 7.5 and TDS 4745 mg/l ★ Scaling prediction: calcium carbonate, calcium sulphate and barium sulphate salts all exceeded their solubility limits ★ Standard anttiscalant could inhibit calcium carbonate and barium sulphate but not calcium sulphate at these high values 17
OSM CO. Case Study Problem: ★ The first pass trains A & B of the plant historically suffered from calcium sulphate deposition ★ Operators decided to reduce recovery rates to 48% against a design specification of 63.5% ★ Even at lower recovery rates the membranes fouled after 4 - 5 weeks of operation with feed pressure increasing from 10 to 12.5 bar ★ Cleaning was carried out when ∆P reached 6.5 bar by circulating a solution of Ethylene Diamine Tetra Acetic acid (EDTA) and Sodium TripolyPhosphate (STPP) at high pH 18
Page 1 and 2: OSM CO. MEMBRANE CHEMICALS Presente
Page 3 and 4: OSM CO. 2
Page 5 and 6: OSM CO. Introduction Desalination t
Page 7 and 8: OSM CO. Pretreatment Options 6
Page 9 and 10: OSM CO. Scale Control Methods (1) A
Page 11 and 12: OSM CO. Antiscalant Addition 10
Page 13 and 14: OSM CO. Antiscalant Addition Dosage
Page 15 and 16: OSM CO. Antiscalant Addition 14
Page 17: OSM CO. Case Study Schematic of pla
Page 21 and 22: OSM CO. Case Study Initial design w
Page 23 and 24: OSM CO. Case Study Results and cost
Page 25 and 26: OSM CO. Case Study Conclusions: 24

MEMBRANE CHEMICALS

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