DESALTING AND WATER TREATMENT MEMBRANE

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DESALTING AND WATER TREATMENT MEMBRANE ( desalting-and-water-treatment-membrane )

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general, the osmotic pressure of water is increased 69 kPa per 1000 mg/L TDS (total dissolved solids). Table 4.1. -Atomic diameters of ions normally found in water supplies Species Sodium (Na’) Chloride (Cl-) Calcium (Ca+*) Magnesium (Mg”) Hydrogen Water (H,O) Diameter (A) 0.95 1.81 0.99 0.65 fluoride (HF) 1.73 2.14 Because undissociated molecules are not an integral part of the ionic matrix, they are washed through the membrane with the water molecules. Flux of these components depends on their concentration at the membrane surface. Small polar molecules encounter resistance, but non- polar molecules are not rejected at all unless they are too large to fit through the spaces in the membrane matrix. Some dissolved salts may pass through the membrane, but ionic charges on either side of the membrane must balance. An equivalent charge of anions and cations must pass at the same time. This process is more likely to happen with nanofiltration membranes because they have larger pores than RO membranes. Divalent cations must bring two monovalent anions with them (and vice versa), and so are less likely to pass through nanofiltration membrane pores. Because of this close relationship between feed water composition and membrane performance, specifications are difficult to obtain from manufacturers without a water analysis. Typically, the best results obtainable are the performance records for a test run with a given salt concentration. Tests are usually run with sodium chloride solutions made with reverse osmosis permeate. Therefore, the performance characteristics listed in chapter 10 should be taken as a best case scenario.

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