Membrane Fouling and Scaling
By: Gil K. Dhawan Ph.D.k P.E., Applied Membranes, Inc.
The concentration of all materials in the feed water – dissolved and
suspended – is highest near the membrane surface. As permeate is removed through
the membrane, all impurities are left behind near the membrane surface. The
layer of water next to the membrane surface (boundary layer) gets increasingly
concentrated in the dissolved and suspended materials. These concentrations
reach a certain steady level depending on the feed velocity, element recovery
and membrane permeate flux (gallons per square foot of permeate produced per
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