JPS6342757A - Solid-liquid separation device - Google Patents

Abstract

PURPOSE:To stabilize a primary flow revolving in a separating vessel and to strongly generate a secondary flow by forming the inner wall of the separating vessel with a curved surface, and forming the bottom surface in such a way that the outer peripheral part is almost plane and then the surface is slanted upward for the center and a sinkhole is formed in the center. CONSTITUTION:The inner wall 3 of the separating vessel 1 is formed with cylindrical or involute-curved surface and the bottom surface 3 is formed in such a way that the outer peripheral part is plane 3a and the surface is changed to a slanted surface 3b gradually slanted upward for the center where a recessed sinkhole 4 for solids is provided. And an inflow opening 5 is provided to the inner wall 2 of the separating vessel 1 and a discharged water containing solids such as sands is introduced through said opening, and the treated water 10 separated from solids is discharged from a discharge opening 9 provided with a filter. In this way, the primary flow revolving in the separating vessel is stabilized and the generation of the secondary flow separating solids from liquid is strengthened and the solid-liquid separation is efficiently and effectively carried out by the multiplied effect of the primary flow and the secondary flow.

Description

[Detailed Description of the Invention] [Objective of the Invention] (Industrial Field of Application) The present invention is directed to separating solids from wastewater, such as rainwater or sewage, that contains solids such as sand, thereby producing a clean and treated wastewater. The present invention relates to a solid-liquid separation device for obtaining a liquid.

[Prior art] Generally, in order to separate solids from wastewater containing solids such as sand and obtain a clean treated liquid, the wastewater is guided tangentially into a separation tank using a gravity flow method, and then the wastewater is swirled. Solid-liquid separators are widely used, which allow solids to settle while allowing the solids to settle.

[Problems to be Solved by the Invention] However, in conventional solid-liquid separators, the bottom surface of the separation tank, which has a concave solids reservoir in the center, slopes downward toward the center. , the degree of change in circumferential velocity of the primary flow swirling inside the separation tank from the outside to the inside of the separation tank is small, and the generation of a secondary flow that flows vertically inside the separation tank and is effective for solid-liquid separation. Not only is the separation efficiency not very good due to its weakness, but the water depth at the center of the separation tank is deep, which has the disadvantage of increasing construction costs for installing the structure.

The present invention was proposed in view of the above-mentioned drawbacks of the conventional art, and it strongly generates a secondary flow that is effective for solid-liquid separation that flows vertically in the separation tank, making it possible to efficiently perform solid-liquid separation. The present invention aims to provide a practically effective solid-liquid separator that can reduce construction costs for installing a structure.

[Structure of the Invention] (Means for Solving the Problems) In order to solve the above-mentioned problems, the present invention has an inner wall having a cylindrical or involute curved surface, a bottom surface having a substantially flat surface at the outer periphery, The separation tank has an upward slope toward the center and has a concave solid matter groove in the center, and has an inlet for introducing wastewater containing solids such as sand into the separation tank, and an inlet for introducing the solid matter into the separation tank. A solid-liquid separator is constructed by providing a discharge port for guiding the separated treated liquid from inside the separation tank to the outside.

[Function] Since the solid-liquid separator of the present invention is configured as described above, the waste water led into the separation tank from the inlet turns as a primary flow along the inner wall of the separation tank, but As for the secondary flow, the bottom surface of the separation tank is almost flat at the outer periphery and slopes upward toward the center, so that the momentum of the primary flow at the outer periphery is relatively large. Therefore, the degree of change in circumferential velocity of the primary flow swirling inside the separation tank increases from the outside to the inside of the separation tank, so the secondary flow that flows vertically in the separation tank is effective for solid-liquid separation. occurrence becomes stronger. As a result, the solids contained in wastewater are
- The solids are efficiently separated by the synergistic effect of the secondary flow and the solids that settle to the bottom of the separation tank are scraped up the slope by the secondary flow and accumulate in the center of the solids.

On the other hand, the treated liquid will be discharged from the discharge port. [Example] The present invention will be specifically described below based on an example shown in the drawings.

FIG. 1 is a sectional view of a solid-liquid separator conceptually showing one embodiment of the present invention, and FIG. 2 is a plan view thereof.

In the figure, reference numeral 1 denotes a separation tank for performing solid-liquid separation, and its inner wall 2 is formed into a cylindrical shape as shown in the figure, or is formed to have an impoly coated curved surface. However, in this embodiment, only the upper part of the inner wall 2 is slightly inclined inward, but the entire inner wall 2 may be slightly inclined inward. In this way, if part or all of the inner wall 2 is formed into a cylindrical shape that is inclined inward, the primary flow A that swirls along the inner wall 2 is caused to flow downward from above to below along the inner wall 2. As a result, the generation of the secondary flow B, which is effective for solid-liquid separation and flows vertically within the separation tank 1, can be further strengthened.

Next, reference numeral 3 denotes the bottom surface of the separation tank l, whose outer periphery is a flat surface 3a, but has an upward slope 3b toward the center, and a concave solid matter surface 4 is formed at the center. It is provided. 5 is an inlet provided on the inner wall 2 of the separation tank l;
Waste water 7 containing solid matter 6 such as sand is tangentially transferred to a separation tank 1
It is connected to an inflow path 8 for guiding the inside of the tank. 9 is a discharge port provided with a filter on the inner wall 2 of the separation tank 1;
It is connected to a discharge path 11 that guides the treated liquid 10 from which the solid matter 6 has been separated from the separation tank 1 to the outside.

However, in this embodiment, the discharge port 9 is located about 3000 degrees downstream of the inlet 5 and above the inlet 5, but for example, the depth of the structure may be a little deeper. By making the inlet 5 into a dark hole, the inlet 5
3600 downstream, that is, at almost the same position as inlet 5,
The outlet 9' may be provided at a position above the inlet 5, and a roof plate may be provided on the upper surface of the inlet 5 to prevent short circuits.

Next, reference numeral 12 denotes an inner cylinder which is installed concentrically in the center of the separation tank 1 and has approximately the same diameter as the solid material support 4. Its lower end is supported by legs 13, and the bottom of the separation tank 1 The solids 6 that have settled on the solids 3 are scraped up the slope of the slope 3b by the secondary flow B, and fall into the solids holder 4 through the gap between the legs 13 and are collected therein. In addition, 14 is a discharge pump for discharging the solid matter 6 accumulated in the solid matter container 4.

By the way, in this embodiment, the inner cylinder 12 was provided at the center of the separation tank 1, but when the inner cylinder 12 is installed in this way,
-The secondary flow A and the secondary flow B are stabilized, and the separation tank 1
Even if solid matter 6 moves to the center, the lower end of inner cylinder 12 is hardly affected by primary flow A or secondary flow B, so fixed matter 6 will not resurface. Solid objects can fall smoothly into the container without causing any damage.
This is extremely convenient.

Next, FIG. 3 shows a different shape of the inner cylinder 12 (A).

(B), (C), and (D) are sectional views showing each section of the storm, and FIG. 4 is a developed view of the outer peripheral surface thereof.゛The inner cylinder 12 may be made entirely of a plain tube as shown in (A), but it may have many holes on its outer circumferential surface as shown in (B), or dotted holes as shown in (C). A large number of various unevennesses may be provided on the inner cylinder 12, or vertical unevenness lines may be provided in the longitudinal direction of the inner cylinder 12 as shown in (d), or (a), (b), (c), and (d) above. If the outer circumferential surface is an appropriate combination of
Since the primary flow at the center of the separation tank 1 weakens and the degree of change in circumferential velocity from the outside to the inside of the separation tank 1 increases, the generation of a secondary flow effective for solid-liquid separation is further strengthened. Can be done.

In the solid-liquid separator of this example having the above configuration,
The waste water 7 tangentially led into the separation tank 1 from the inlet 5 through the inflow channel 8 swirls in the separation tank 1 as a strong and stable primary flow A, but this secondary flow A is Separation tank 1
Since the bottom surface 3 of is flat at the outer periphery and slopes upward toward the center, the momentum of the primary flow A at the outer periphery becomes relatively large. Therefore, the degree of change in circumferential velocity of the primary flow A swirling inside the separation tank 1 from the outside to the inside of the separation tank 1 becomes large, so it is effective for solid-liquid separation flowing vertically inside the separation tank 1. The generation of the secondary flow B becomes stronger, and the solids 6 contained in the waste water 7 are efficiently separated by the synergistic effect of the secondary flow A and the secondary flow B.

The solids 6 that have settled on the bottom surface 3 of the separated separation tank 1 are just scraped toward the center by the secondary flow B on the slope of the slope 3b that serves to strengthen the guidance of the secondary flow B, and the solids are successively The water will fall into the water tank 4 and will be drained out by the drainage pump 14 as appropriate. On the other hand, the treated liquid 10 from which the solid matter 6 has been separated and is now clean is quietly discharged into the discharge path 11 from the discharge port 9 without directly colliding with the waste water 7 newly flowing in from the inlet 5. Become.

In this embodiment, the inner wall 2 has a cylindrical shape that is inclined inward, but the inner wall 2 does not need to be inclined.

In addition, in this embodiment, an inner cylinder 12 is provided at the center of the separation tank l.
However, if the inner wall of the separation tank 1 has a small diameter, the inner cylinder may not be provided. The inner cylinder 12 may have an optimal size and shape as required.

[Effects of the Invention] As specifically explained above, according to the present invention, it is possible to stabilize the primary flow swirling in the separation tank and strengthen the generation of the secondary flow effective for solid-liquid separation. Therefore, solids can be efficiently separated by the synergistic effect of the secondary flow and the secondary flow. In addition, the solid matter that has settled on the bottom of the separation tank can be smoothly dropped to the solid matter by the secondary flow. In addition, compared to conventional separation tanks where the bottom slopes downward toward the center, the water depth at the center of the separation tank can be made shallower, making it easier to install structures by that amount. Costs can be saved. This solid-liquid separation method is extremely effective in practice and is used to separate solids from wastewater that contains solids such as sand, such as sewage and sewage, to obtain a clean treated liquid. The device can be provided.

[Brief explanation of the drawing]

FIG. 1 is a sectional view of a solid-liquid separator conceptually showing an embodiment of the present invention, FIG. 2 is a plan view thereof, and FIG. c). A cross-sectional view showing (d) divided into each genus of one cross section,
FIG. 4 is a developed view of its outer peripheral surface. 1...Separation tank, 2...Inner wall, 3...Bottom surface (3a/
...plane, 3b...tilt), 4...solid matter, 5
...Inlet, 6...Solid matter, 7...Drainage, 8...
- Inflow path, 9... Outlet, 10... Treated liquid, 11
...Discharge path, 12...Inner cylinder, 13...Legs, [4 Drain pump, A...-Secondary flow, B...Secondary flow. Figure 1 Figure 2

Claims (1)

[Claims] A separation tank with an inner wall having a cylindrical or involute curved surface, a bottom surface that is almost flat at the outer periphery, an upward slope toward the center, and a concave solids reservoir in the center. , a solid-liquid separation device characterized by being provided with an inlet for guiding wastewater containing solids such as sand into a separation tank, and an outlet for guiding a treated liquid after separating solids from the separation tank to the outside. .