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Thermodynamic equations for electrolytes were used to calculate the gypsum scaling potential ofthe feed water based on its ionic composition. The extent of concentration polarization at themembrane surface was determined from the film model. A proportionality factor relating thekinetic difference between the saturation predicted by the gypsum solubility model and the actualcrystallization was obtained from glassware experiments. Lastly, a parabolic equation relatingantiscalant (polyacrylic acid) dose to the normalized concentration factors of the saline solutionwas experimentally developed. These theoretical and experimental parameters were combinedinto a single model for predicting the required antiscalant dose to control calcium sulfate scale innanofiltration membranes for any given saline solution. The model was tested with modelsolutions simulating saline agricultural drainage waters. Includes 14 references, tables, figures.

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Edition: Vol. - No. Published: 03/05/2003 Number of Pages: 14File Size: 1 file , 1.3 MB