| 摘要 |
<p>The present invention relates to a method for removing water from sludges, such as sludges from woodhandling or community sewage treatment plants or the like biosludges, in order to make it possible to dewater these sludges mechanically to a high dry matter content, for instance by pressing at a high pressure. Such methods comprising following subsequent steps: coagulating (12), flocculating (14) and removing water mechanically (20) from the sludge by pressing. The method according to the invention further comprises an intense pretreatment step for the sludge prior to the removal of water from the sludge, in which intense pretreatment step the sludge is treated by physical or physical-chemical means by vigorously mixing the sludge and electrically ionizing (36) it or treating it with ultrasound, in order to activate the water bound to the sludge and to make the chemicals to be added to the sludge more effective.</p> |
