Long sand trap for separating and removing sand from water from

Details Long sand trap for separating and removing sand from water from Long sand trap for separating and removing sand from water from

1993-01-29

1994-12-13

Bascomb, Jr., Wilbur

Liquid purification or separation

Structural installation

Flume stream type

210159, 210162, 210415, 210523, B01D 2106, B01D 3327

Patent

active

053727134

DESCRIPTION:

BRIEF SUMMARY
FIELD OF THE INVENTION

The invention relates to a long or elongated sand trap for separating and removing sand from inflow channels, particularly of sewage treatment plants, comprising a settling channel having in particular a trapezoidal cross-section and extending along a straight path, said settling channel being provided with a collecting chamber for the sand in its bottom area, with a transporting conveyor device placed therein which is acting in a direction opposite to the flow direction effective within the inflow channel, and further comprising a classifying conveyor device which discharges the sand delivered from the transporting conveyor device in an upwardly inclined manner.


BACKGROUND OF THE INVENTION

By a long sand trap an elongated shallow sand trap is understood in which the flowing-through essentially takes place along a straight horizontal path. During the flowing-through along said path the sand contained in or carried by the water has the opportunity to drop towards the bottom of the settling channel and to enter a collecting chamber formed there. Thereafter the sand is removed from this collecting chamber, e.g. by means of a transporting conveyor device which in many cases is constructed as a conveyor worm.
By sand a material is understood which has a particle size of >0,2 mm in diameter. If possible the sand is to be separated without adhering organic constituents. Thus, the sand trap also serves the purpose of separating the sand from the sewage sludge. In so far it is important that the working direction of the transporting conveyor device is opposite to the direction of flow within the inflow channel. The long sand trap here in the area of the transport conveying device also serves the purpose for washing out the sand.
A long sand trap of the kind described above is known. It has a trapezoidal or roughly trapezoidal cross-section which is formed asymmetrically and has only one inclined wall. The transporting conveyor device is disposed within the collecting chamber at the lowest place of the settling channel, and thus, here, eccentrically with respect to the central longitudinal plane in the region of the continuous vertical wall of the channel. A classifying conveyor device which discharges the sand delivered by the transporting conveyor device in an upwardly inclined manner, belongs to this long sand trap. The classifying conveyor device must begin at a lower place than the transporting conveyor device in order to be in a position to receive and to discharge the sand delivered. It is known to arrange the classifying conveyor device, so to speak, adjacent the vertical wall and therewith outside the actual cross-section of the settling channel. This increases the cost of construction considerably. It is also known to dispose the transporting conveyor device eccentrically with respect to the central longitudinal plane of the cross-section of the settling channel, however, not at the lowest place, and to provide the classifying conveyor device at the lowest place, i.e. directly adjacent the vertical wall. In this case both the transporting conveyor device and the classifying conveyor device are disposed eccentrically with respect to the central longitudinal plane.
Finally, it is known to construct the cross-section of the settling channel symmetrically with respect to the central longitudinal plane and thus to form two inclined walls such that the lowest place and therewith the collecting chamber for the sand can be arranged in the central longitudinal plane of the settling channel. As a result of this arrangement the central longitudinal plane no longer is available for disposing the classifying conveyor device. Thus, the classifying conveyor device is provided eccentrically with respect to the central longitudinally plane.
These known long sand traps indeed are operated in advantageous manner such that the transporting conveyor device acts opposite to the direction of flow within the inflow channel, and therewith advantageously washes organic constituents out of the sand. How

REFERENCES:
patent: 2929504 (1960-03-01), Lind et al.
patent: 3865727 (1975-02-01), Broling et al.
patent: 4701266 (1987-10-01), Janka et al.
patent: 4836919 (1989-06-01), Huber
patent: 4838995 (1989-06-01), Klausen
patent: 4859322 (1989-08-01), Huber
patent: 5006236 (1991-04-01), Croket
patent: 5110461 (1992-05-01), Abel

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