Process for removing unwanted materials from fluids and for producing biological products
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United States of America Patent
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Aug 31, 1993
Grant Date -
N/A
app pub date -
Jan 10, 1992
filing date -
Jan 10, 1992
priority date (Note) -
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Abstract
The invention employs dual-skinned membranes 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 sieving coefficient characteristics different for flow of liquids in one direction from that in the opposite direction. Improved dialysis devices are formed by using bundles of the hollow fiber membranes as a dialysis means having rectifying properties. Improved bioreactors are formed by using bundles of hollow fiber as a growth vessel having rectifying properties.
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