Method and apparatus for removing floating substances and salts from a liquid by means of a membrane filtration
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United States of America Patent
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Jun 10, 2003
Grant Date -
N/A
app pub date -
May 11, 2001
filing date -
Nov 13, 1998
priority date (Note) -
Expired
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Abstract
A membrane filtration for removing floating substances and salts from a liquid, uses vertically positioned capillary or tube membranes which are suitable for performing nano or hyper-filtration. Repeatedly and consecutively the following steps are performed: a) a permeate is produced without discharge of concentrate for a predetermined period of time; b) then a gas, for example air, is guided along side the membrane, at least almost without discharge of permeate and without discharge of concentrate; c) and finally a concentrate is discharged without discharge of permeate. During step a) and step c) use can be made of a combined supply of liquid and gas. An apparatus for performing this method is described as well.
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