Abstract
The membrane transport and separation characteristics of natural humic macromolecules and a model polyelectrolyte, poly(styrene sulfonate), in ultrafiltration systems employing hydrophilic, neutral, cellulosic-type membranes were studied. The application of a permeation model based on membrane flux equations was systematically validated for charged, random-coil polymers. It was possible to characterize transport behavior of various solute/membrane combinations by a single membrane permeation factor, which was found to depend strongly on solution ionic strength, but to be relatively independent of the ultrafiltration operating mode
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