DEVICE FOR DRAINING THE WASHING WATER FROM A FILTER WITH GRAINY FILTER MATERIAL AND SIMULTANEOUS WASHING WITH WATER AND AIR.

摘要

Device intended for removing washing water from filters containing granular filter material, which are washed simultaneously with water and air, such as those employed especially in water treatment, and for recovering the particles of granular filter material which are entrained by the water during the washing, characterised in that it comprises: … …  - a calibrated member (11) for collecting and removing dirty water; …  - internal and external partitions (10,10a - 20,20a) placed on either side of the collecting member, defining inside the internal partitions a water recovery region and, between the internal and external partitions, flow-calming regions promoting the separation, by downward concurrent settling, of the particles of granular material and of the dirty water to be removed, …  - a baffle (13) intended to prevent the preceding regions being perturbed by the three-phase water-air-granular material mixture formed during the washing, placed under the said regions and directing this mixture towards an external degassing region, where the air is removed before the mixture, having become two-phase, enters the calming/settling regions. … …IMAGE…