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Solubility of Typical brackish water constituents

Brackish water contains many dissolved salts that, when concentrated, would precipitate in electrodialysis concentrate compartments. Electrodialysis reversal (EDR) mitigates this problem by regularly changing the polarity of the applied voltage, which dissolves nascent scale that had formed in compartments that were previously concentrating (Katz, 1979). The figure below shows the relative solubility of several common dissolved salts in brackish water and desalination concentrate (Data is from Siedell, 1907). In general, chloride salts and sodium salts are very soluble. However, sodium sulfate and sodium carbonate have steep declines in solubility with decreasing temperature and sodium bicarbonate has a relatively low solubility.


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