AWWA SP250150

AWWA SP250150 Modeling Membrane Mass Transfer Using Dimensional Analysis
Conference Proceeding by American Water Works Association, 01/01/1991

Duranceau, Steven J.; Taylor, James S.

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Mass transfer resistance at the membrane surface has been modeling using a dimensional analysis (DA) approach, where the Sh number was determined from the NF-70 membrane feed channel characteristics and fluid properties so that solute mass transfer coefficients (MTCs) could be predicted. DA was used to model solute MTCs where nonelectrolyte MTCs (dibromochloropropane (DBCP)) were predicted based on a empirical Wilke-Change diffusion coefficient and individual ion MTCs (sodium, iron, calcium) were predicted from a Nernst diffusion coefficient. Although the Wilke-Change empirical approximation was shown to be useful in predicting the nonelectrolyte DBCP MTC, use of the Nernst equation did not reliably predict the MTCs of the charge ions sodium, iron and calcium in a NF-70 membrane.