JPS56124408A - Removing device for sand contained in miscellaneous waste water - Google Patents

Abstract

PURPOSE: To draw off sedimented sand efficiently through a sand draw-off pipe while preventing the sand from consolidating by injecting air to the vicinity of a sand intake port of a sand intake pipe provided in a sand settling chamber, the intake port opening into the bottom part of the chamber.

CONSTITUTION: The sand 22 contained in the miscellaneous waste water introduced into the sand-settling chamber 3 via an inlet port 2 is settled at the bottom part of the chamber 3. The air fed through an air feed pipe 9 is discharged from jet holes 6 of an air diffuser pipe 5 and is jetted into the sand 22 on both sides of a cover plate 7 provided at the upper part of the diffuser pipe 5, thereby stirring the sand and removing the suspended solids and the like adhered to the sand. On the other hand, by an ejecting action of the air supplied into the sand draw-off pipe 11 through an air feed pipe 12, the sand 22 is drawn off via the sand intake port of the sand intake pipe 4 together with the waste water and is fed into a separation chamber 16 through the draw-off pipe 11. Then, sand 19 is in the separation chamber 16, the waste water separated is caused to flow down into the settling chamber 3 via a waste-water outlet port 18 and is discharged into a digestion chamber via a discharge port 15 together with the waste water in the chamber 3.

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