| 摘要 |
In a back-flushable filter, a granular filter material is heaped on a nozzle tray (11). During the filtration of contaminated liquids, accumulations of dirt which cannot be flushed out at normal back-flushing rates occur in the peripheral zone (16); means are therefore provided in the peripheral zone to increase the flow cross-section. This increases the amount of flushing water in the peripheral zone, as a result of which a higher local flow rate is achieved. The means are an increase in the number of nozzles (15) per unit area and/or in the flow cross-section of the individual nozzles in the peripheral zone. <IMAGE>
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