JPS5841096B2 - Sand cleaning equipment - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a device for cleaning sediment deposited in a settling pond of a relay pumping station, a final treatment plant, or the like.

At relay pumping stations or final treatment plants, etc., non-perishable inorganic substances and coarse suspended solids are generally removed to prevent contamination of the discharge water area and sediment accumulation, and to prevent wear and tear and blockage of pumps and treatment facilities. A settling basin will be installed upstream of the treatment facility to ensure smooth operation of the treatment facility.

The sediment deposited in this settling basin contains a large amount of decayable organic matter, but it would be inconvenient to bury or otherwise process it as it is.
Usually, a cleaning treatment is performed in advance.

Conventionally, there are rotating drum-type or cyclone-type sand settling and cleaning devices that carry out the above-mentioned treatment, but since they are large, they require a large area and also require a large amount of washing water. The entire facility will be large-scale.

In addition, as for the performance required of the equipment itself, the properties of the sediment that settles and accumulates in the settling basin are constantly changing, and the changes are further exacerbated by the weather. What is required is something that can be accommodated.

However, conventional equipment cannot function satisfactorily in response to sediment whose properties are constantly changing, and the equipment as a whole is complicated and expensive.

The present invention eliminates the drawbacks of the conventional devices as described above,
It is an object of the present invention to provide a device which has a simple structure and can sufficiently cope with fluctuations in the properties of sand sedimentation.

FIG. 1 is a front view showing an embodiment of the present invention, FIG. 2 is a longitudinal sectional view of the same, and FIG. 3 is an enlarged sectional view of the main part.

In these figures, reference numeral 2 denotes a casing, which is generally made of a steel plate or the like, and has an inflow pipe 1 at the top and a discharge pipe 10 at the bottom.

A bottom plate 7 is provided inside the casing 2, and the angle of inclination of the bottom plate 7 is formed to be greater than the angle of repose of sediment in water.

Next, reference numeral 8 denotes an outflow adjustment column, which is provided below the bottom plate 7 so as to be vertically movable.

Inside the casing 2 is a rotating shaft 6 connected to a drive motor 5.
An overflow layer 4 is provided above the casing 2, and a guide inclined in the direction of the discharge pipe 10 is provided at the bottom of the casing 2. A bottom 11 is provided.

FIG. 3 is an enlarged sectional view of the bottom of the casing 3, in which reference numeral 9 denotes a support portion, which is configured to be threadedly engaged with the outflow adjustment column 8.

With the above configuration, sewage containing non-perishable inorganic substances and a large amount of perishable organic substances is introduced into the casing 2 through the inflow pipe 1 and is filled with it.

The drive motor 3 then rotates the rotating shaft 6.

Since the inclined stirring blade 5 is fixed to the rotating shaft 6, upward flow and overflow are generated in the casing 2, and the water is completely stirred and mixed.

By this stirring, the inorganic matter adhering to the putrefying organic matter is peeled off, and the settled sand with a large specific gravity is deposited in the lower part of the casing 2.

The sedimented sand flows out onto the guide bottom 11 through the gap between the bottom plate 7 and the outflow control column 8, and is discharged from the discharge pipe 10.

On the other hand, organic substances with low specific gravity flow out together with the sewage from the overflow weir 4 above the casing.

In this case, since the space between the bottom plate 7 and the outflow control column 8 can be adjusted by vertically moving the outflow control column 8, the outflow amount can be adjusted in accordance with the content of sediment components in the sewage and the properties of the sediment. It is possible.

Batch processing can also be performed by closing the gaps, and continuous processing and batch processing methods can also be adopted.

In addition to screws, known reciprocating means may be used as the means for vertically moving the outflow regulating column.

Since the settling and cleaning device of the present invention has the configuration and operation as described above, it can achieve the following effects.

(1) The rotation of the inclined stirring blade causes an upward flow in the sewage water in the casing and turbulent flow due to the rotation to perform forced stirring, so the separation and cleaning effect of organic matter and inorganic matter is excellent.

(2) An outflow control column is provided at the bottom of the casing to control the outflow amount of precipitated sediment, so it is possible to use a discharge method suitable for purposes such as high concentration sewage, continuous discharge, etc.

(3) Since sewage is temporarily stored in the casing for cleaning, it has excellent responsiveness to changes in the amount of sewage inflow and water quality.

[Brief explanation of the drawing]

1 and 2 are a front view and a vertical sectional view showing an embodiment of the present invention, respectively, and FIG. 3 is an enlarged sectional view of the same essential part. 2... Casing, 5... Inclined stirring blade, 7... Bottom plate, 8... Outflow control column.

Claims (1)

[Claims] 1. A settling and cleaning device characterized by having an inclined agitation blade in the cleaning tank, a bottom having an inclined surface that is equal to or higher than the angle of repose of the settled sand, and a vertically movable outflow control column at the bottom of the tank. .