JPS604564Y2 - Tilted screen separator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an improvement in a tilted wedge wire screen solid-liquid separator.

Generally, a wedge wire screen panel used for an inclined screen is a screen in which slits are formed by arranging a large number of rod-shaped members having a wedge-shaped cross section in parallel, and the screen is inclined at an angle of approximately 600 degrees. This device performs solid-liquid separation by passing separated water toward the back side.

When the suspension is allowed to flow down from the top of the screen, solids (SS) are separated onto the panel surface, water passes to the back of the panel, and the separated solids slide down the panel surface under their own weight.

Traditionally, most of these inclined screens have been used to remove coarse foreign matter from wastewater, but recently they are increasingly being used to thicken slurries such as activated sludge. There is.

The inventors of the present invention conducted various tests for the purpose of concentrating such activated sludge slurry, and as a result, they found that there were the following problems.

That is, the solids separated on the screen surface initially stay on the screen surface without immediately sliding down, but as the separated solids are successively supplied from above, It has been found that when the amount exceeds a certain level, it is no longer able to stay on the screen surface due to its own weight, and it suddenly slides down or rolls down on the Surleen surface.

A considerable amount of moisture still adheres to the solids separated on the screen surface, and while the solids are retained on the screen surface, this moisture passes through the slits and migrates to the bottom of the screen where it is drained. However, if the solids suddenly slide down the screen surface due to their own weight as described above, the residence time of the solids on the screen surface will be very short, and sufficient water will not be drained and the concentration rate will decrease. It gets extremely bad.

The present invention was devised based on such experimental observations, and an object of the present invention is to provide a screen separation device that can improve the sludge concentration rate with a simple configuration.

In the present invention, a plurality of baffles for preventing solid objects from falling are arranged on the screen surface of an inclined screen at predetermined intervals along the falling direction of the solid objects, and each of these baffles is intermittently provided with baffles on the screen surface. This is a tilted screen separation device configured to connect operating mechanisms for contact and separation, and to sequentially perform contact and separation operations from the upper baffle to the lower baffle with respect to the screen surface over time.

An embodiment of the present invention will be described with reference to the drawings. In a solid-liquid separator that supplies a suspension 2 onto an inclined screen 1 and separates the SS on the screen, the separated SS is separated on the screen surface 1'. A plurality of baffles 3', 3 for preventing the solid objects 8 from sliding down are arranged at predetermined intervals along the falling direction of the solid objects 8.

These baffles 3', 3 are provided in the vertical direction, and are each equipped with an actuation mechanism for bringing the baffles 3', 3 into contact with and away from the screen surface 1' intermittently. Opening/closing (contact, separation) operations are performed sequentially from the upper part to the lower part.

After the flocculant is added to the suspension 2 to form flocs, the feed box 4 is fed to the screen surface 1'.
When a suspension containing flocs is supplied onto the screen panel, the flocs are separated by the screen panel, and separated water 5 falls from the back side of the screen panel into a separated water receiving tank 6 and is discharged from a pipe 7.

The solid matter 8 separated on the screen surface 1' slides down on the screen surface 1' due to its own weight, but the baffle 3
′ temporarily prevents the person from sliding down.

While retained in front of the baffle 3', the blocked solids 8 exude moisture, which is separated to the back side of the screen panel and further concentrates the solids 8.

When a predetermined amount of solid matter 8 is retained in the front part of the baffle 3', the lower part of the baffle 3' is opened by driving the piston rod 10' of the piston 9' to the right in the drawing. The retained concentrated solids fall under their own weight, are prevented from sliding down by the next row of baffles 3, and are concentrated while being retained in the same way as described above. When the piston 9 is driven to open the lower part of the baffle 3, the concentrated solids are removed. It falls under its own weight.

The concentrated solids are concentrated by the sequentially arranged baffles and fall into the concentrated sludge receiving tank 11.

The baffles 3', 3 at the point where the concentrated solids have fallen are closed to prevent the solids from sliding down next.

By repeating such cycles, the solids are successively concentrated.

In addition, 10 in the figure is a piston rod.

The appropriate opening/closing period of the baffles 3' and 3 is normally 30 to 6 m2, and if it is too long, the amount of separated water will not increase much and the sludge concentration rate will not improve, and the baffles 3'.

This is not desirable because sludge overflows from the side of 3.

In the illustrated example, a piston is used as the operating mechanism for the baffles 3' and 3, but any type such as a cam mechanism may be used.
The baffles 3', 3 may be opened and closed by the gravity of the concentrated solids.

Furthermore, the mounting position of baffles 3' and 3 is screen surface 1'.
The upper part is not preferable, and the lower part is preferably effective.

Although it is preferable that the baffles 3' and 3 be provided in the vertical direction as in the illustrated example, they may be provided in an inclined manner.

As described above, the present invention has discovered that there is a close relationship between the residence time of solids screen-separated from a suspension on the screen surface and the sludge concentration rate, and has successfully solved this phenomenon with a simple structure. It was designed to be used for
Through simple operation, it is possible to obtain thickened sludge with a higher solids concentration than with conventional inclined screen separation equipment, and the amount of sludge supplied to the subsequent thickened sludge dewatering process can be reduced, streamlining the dewatering process. profits can be obtained.

[Brief explanation of the drawing]

The drawing is a cross-sectional view of an embodiment of the present invention. 1... Inclined screen, 1'... Screen surface, 3, 3'... Baffle, 9, 9'
...Piston, 10,10'...Piston rod.

Claims (1)

[Claims for Utility Model Registration] 1. A plurality of baffles for preventing solid objects from falling are arranged on the screen surface of the inclined screen at predetermined intervals along the falling direction of the solid objects, and each of these baffles is provided with a baffle. An inclined screen separation device configured to connect an operating mechanism for intermittently contacting and separating the screen surface, and sequentially contacting and separating the screen surface from an upper baffle to a lower baffle with time changes. . 2. The device according to claim 1, wherein the baffle is provided in a vertical direction.