| 摘要 |
The present invention relates to a method for purification of water by means of dead-end filtration using a micro or ultra filtration membrane, wherein the filtration is periodically interrupted to cleanse the membrane, wherein prior to, during the start or during each filtration period a filtration aid is added to the water to be purified, so that a layer of said filtration aid is deposited on the membrane, wherein the filtration aid comprises particles of an ion-exchange resin having a particle size of 0.5 to 50 mu m. The filtration aid preferably is added in a high concentration prior to or during the start of each filtration period. With the method according to the invention the water is completely freed in a single purification step from suspended and colloidal matter and specific dissolved elements such as for instance hardness, manganese, ammonium, assimilable organic carbon and colour. |
