Method for concentrating a solute with an oscillating filtration

Details Method for concentrating a solute with an oscillating filtration Method for concentrating a solute with an oscillating filtration

1994-02-09

1996-01-02

Spear, Frank

Liquid purification or separation

Processes

Liquid/liquid solvent or colloidal extraction or diffusing...

21050023, B01D 6128

Patent

active

054805520

ABSTRACT:
Dual-skinned membranes are provided useful as one-way or rectifying membranes which reduce back filtration of solute molecules in dialysis and which improve nutrient supply and product recovery in membrane bioreactors. The membranes are dual-skinned polymeric materials preferably in the form of hollow fibers. The membranes have skins of polymer on the opposite sides with differing permeability to solutes and sieving coefficient characteristics. The skin on each side have pores that are invisible at 10,000 times magnification. A microporous structure between the skins contains pores capable of retaining solutes in a molecular weight range of about 5000 to 200,000 in an increased concentration between the interior and the exterior skins. Improved dialysis devices are formed by using bundles of the hollow fiber membranes as a dialysis member having rectifying properties.

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