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Solubility of Calcium Phosphate in Concentrated Dairy Effluent Brines

The solubility of calcium phosphate in concentrated dairy brine streams is important in understanding mineral scaling on equipment, such as membrane modules, evaporators, and heat exchangers, and in brine pond operation. In this study, the solubility of calcium phosphate has been assessed in the presence of up to 300 g/L sodium chloride as well as lactose, organic acids, and anions at 10, 30, and 50 °C. As a neutral molecule, lactose has a marginal but still detectable effect upon calcium solubility. However, additions of sodium chloride up to 100 g/L result in a much greater increase in calcium solubility. Beyond this point, the concentrations of ions in the solution decrease significantly. These changes in calcium solubility can readily be explained through changes in the activity coefficients. There is little difference in calcium phosphate speciation between 10 and 30 °C. However, at 50 °C, the ratio of calcium to phosphate in the solution is lower than at the other temperatures and varies less with i...

Authors:   K. Kezia; J. Lee; B. Zisu; G. Q. Chen; S. L. Gras; S. E. Kentish
Journal:   Journal of Agricultural and Food Chemistry
Year:   2017
DOI:   10.1021/acs.jafc.6b05792
Publication date:   11-May-2017
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