| 摘要 |
<p>A method for cleaning water comprising membrane distillation (1), abbreviated as "MD", which distillation (1) is arranged to use differences in partial pressure with the aid of a hydrophobic membrane through which membrane only clean water (2) in a gaseous state is caused to pass, whereby a water residual (4) that contains an elevated content of contaminants does not pass through the membrane. The invention is characterised in that a pretreatment (5), in which the surface tension of the water is caused to be raised to a level at which the water is prevented from passing the said membrane in its liquid state, is caused to precede the membrane distillation (1).</p> |
