Thermodynamic equations for electrolytes were used to calculate the gypsum scaling potential of
the feed water based on its ionic composition. The extent of concentration polarization at the
membrane surface was determined from the film model. A proportionality factor relating the
kinetic difference between the saturation predicted by the gypsum solubility model and the actual
crystallization was obtained from glassware experiments. Lastly, a parabolic equation relating
antiscalant (polyacrylic acid) dose to the normalized concentration factors of the saline solution
was experimentally developed. These theoretical and experimental parameters were combined
into a single model for predicting the required antiscalant dose to control calcium sulfate scale in
nanofiltration membranes for any given saline solution. The model was tested with model
solutions simulating saline agricultural drainage waters. Includes 14 references, tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 1.3 MB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 14 |
| Published : | 03/05/2003 |
