| 摘要 |
<p>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.</p> |
