| 摘要 |
<p>In order to provide long periods of operation without blinding, a dead-end filter (30) has a reversible filter cloth (105) of conical shape. Filtration is performed in one direction, and back-washing is performed in the opposite direction, causing the filter cloth (105) to turn inside out and assisting release of filtered particles. The filter is of particular use in a system for removing nitrate from water using a resin/filter aid mixture, for regenerating the resin. The solid particles are carried as a suspension and are removed using the filter, which is then dried, the particles being regenerated and washed by passing a regenerant and then water through the filter in the same direction, and the particles are returned to a point of use by passing water through the filter in the opposite direction.</p> |
