JPH0112525B2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention is a method for separating solids from wastewater containing solids such as sand, such as sewage or sewage, to obtain a clean treated liquid. This invention relates to a solid-liquid separator.

[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, the conventional solid-liquid separator has a drawback in that it is not possible to increase the separation efficiency because the primary flow swirling in the separation tank is weak.

In addition, in conventional solid-liquid separators, a relatively small-diameter blowout pipe is sometimes provided in the center of the separation tank to collect and take out floating light solids, but the Because the degree of change in the circumferential velocity of the primary flow from the outside to the inside of the separation tank is small, the generation of a secondary flow that is effective for solid-liquid separation that flows vertically in the separation tank is weak, and the separation efficiency is low. There was a drawback that it was not good.

The present invention has been proposed in view of the above-mentioned conventional drawbacks, and the present invention forcibly generates a primary flow swirling in a separation tank, and also strengthens the generation of a secondary flow that is effective for solid-liquid separation. The purpose is to provide a practically effective solid-liquid separation device with improved efficiency.

[Means for Solving the Problems] In order to solve the above problems, the present invention has an outer wall having a cylindrical or involute curved surface, a bottom surface inclined downward toward the center, and a concave shape in the center. An inlet for introducing wastewater containing solids such as sand into the separation tank on the outer wall of the separation tank provided with a solid matter reservoir;
A discharge port is provided to guide the treated liquid from inside the separation tank to the outside after solids have been separated, and an inner cylinder is provided at approximately the center of the separation tank between its lower end and the bottom of the separation tank toward the solids reservoir. The solid-liquid separation device is characterized in that the solid-liquid separation device is supported so that a solid material transfer passage is formed and is provided with a driving means for rotating the inner cylinder around a vertical axis.

[Function] Since the solid-liquid separator of the present invention is configured as described above, the wastewater introduced into the separation tank from the inlet is forced into the separation tank by the inner cylinder rotating around the vertical axis. It becomes a primary flow and swirls.
In addition, 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 inside the separation tank is effective for solid-liquid separation. The occurrence of becomes stronger. As a result, the solids contained in the wastewater efficiently settle to the bottom of the separation tank due to the synergistic effect of the primary flow and secondary flow, and accumulate in the solids reservoir through the solids transfer passage. Become. On the other hand, the treated liquid will be discharged from the discharge port.

[Example] Hereinafter, the present invention will be specifically described based on an example shown in the drawings.

FIG. 1 is a cross-sectional view of a solid-liquid separator showing one embodiment of the present invention, and FIG. 2 is a cross-sectional view taken along arrow A-A in FIG.
FIG. 3 is a cross-sectional view taken along a line.

In the figure, 1 is a separation tank that performs solid-liquid separation, and its outer wall 2
is formed into a cylindrical shape as shown in the figure, or is formed to have an involute-like curved surface. Reference numeral 3 denotes a bottom surface of the separation tank 1, which is inclined downward toward the center, and a concave solid matter reservoir 4 is provided at the center thereof. 5 is the outer wall 2 of the separation tank 1
The inlet is opened at a position slightly off center and is connected to an inlet passage 8 for guiding waste water 7 containing solid matter 6 such as sand into the separation tank 1.

Reference numeral 9 denotes a discharge port having a filter provided on the outer wall 2 of the separation tank 1, and is connected to a discharge path 11 that guides the treated liquid 10 after separating the solid matter 6 from the inside of the separation tank 1 to the outside.

Note that the outlet 9 is located at a position shifted approximately 300 to 330 degrees downstream from the inlet 5;
A baffle plate 12 is provided on the front surface of the separation tank 1 to prevent the waste water 7 swirling in the separation tank 1 from flowing directly into the discharge port 9.

Next, reference numeral 13 denotes an inner cylinder having a relatively large diameter or a truncated conical shape with a small inclination angle, which is provided concentrically in the center of the separation tank 1, and the lower end of the inner cylinder is provided with a buoyant force. Circular hollow box 1 for supporting 13
4 is attached to the hollow box 14, and on the outer periphery of the hollow box 14, a triangularly protruding annular guide plate 15 is provided. Note that concave vertical grooves 16 are provided on the surfaces of the inner cylinder 13 and the annular guide plate 15 at equally divided positions in the circumferential direction. are arranged so that they are densely arranged above and below. 18 is a motor installed on the ceiling plate 19 of the separation tank 1, and the lower end of its rotating shaft 20 has a
An inner cylinder 13 is supported, and when a motor 18 is driven, the inner cylinder 13 rotates in the direction of the arrow. Note that 21 is a hollow box 1 at the lower end of the inner cylinder 13.
4 and an annular guide plate 15 and the bottom surface 3 of the separation tank 1 is a solid matter moving passage for guiding the solid matter 6 settled on the bottom surface 3 to the solid matter reservoir 4.
Further, P ₁ is a discharge pump for discharging the solid matter 6 accumulated in the solid matter reservoir 4, and P ₂ is a pump pump for pumping up the treated liquid 10 discharged into the discharge path 11 and supplying water. It is. In addition, S in the figure
G indicates a primary flow swirling within the separation tank 1, and G indicates a secondary flow flowing vertically within the separation tank 1.

In the solid-liquid separator of this embodiment having the above configuration, the separation tank 1 is connected to the inlet 5 through the inflow path 8.
The waste water 7 guided inside becomes a strong primary flow S and swirls inside the separation tank 1 by the inner cylinder 13 rotating around a vertical axis.

This strong primary flow S that is forcibly generated within the separation tank 1 has a difference in flow velocity between the inside and outside, and the primary flow S swirling inside the separation tank 1 flows from the outside to the inside of the separation tank 1. As the degree of change in circumferential velocity that reaches , becomes greater, the generation of secondary flow that is effective for solid-liquid separation and flows vertically within the separation tank 1 becomes stronger. Therefore, the solids 6 contained in the waste water 7 are efficiently separated by the synergistic effect of the strong primary flow S and the secondary flow G, and settle on the bottom surface 3 of the separation layer 1. The solids 6 that have settled on the bottom surface 3 of the separation tank 1 are gradually pushed toward the center by the secondary flow G, and are guided by the annular guide plate 15 through the solids transfer passage 21. The solids are smoothly collected in the solids reservoir 4, and are appropriately discharged by the discharge pump _P1 . In this way, the solid matter 6 is sequentially sedimented and separated, and the treated liquid 1 becomes clean.
0 is quietly discharged into the discharge path 11 from the discharge port 9 having a filter on the back side of the baffle plate 12,
The water will be pumped up by pump P ₂ and sent to the destination.

In addition, in this embodiment, the inner cylinder 1 to be rotated
3 is provided with vertical grooves 16 on the surface thereof to strengthen the generation of the primary flow S, and water holes 17 are provided above and below within the vertical grooves 16. Since it circulates through the inner cylinder 13, there is an advantage that the secondary flow G becomes stronger.

Next, FIG. 3 is a sectional view schematically showing another embodiment of the inner cylinder 13.

Since the inner cylinder 13 is rotated, it is effective to some extent even if it is a simple cylinder as shown in A, but it is possible to provide a water passage hole 17 as shown in B or a concave vertical groove 16 as shown in C. The primary flow S can be further strengthened by providing a convex vertical protrusion piece 22 as shown in D, or by providing simple grooves or protrusions in the form of dots. However, the embodiments shown in A to D may be combined as necessary.

Further, as shown by dotted lines in FIG. 3, if vertical protrusions 23 are provided radially at the upper part of the inside of the inner cylinder 13 having the water passage hole 17, the rotation of the inner cylinder 13 will cause the inner cylinder 13 to The drainage water 7 inside is stirred by the vertical protrusion piece 23, and the water passage hole 1 is stirred by the action of centrifugal force.
7 to the outside of the inner cylinder 13, the secondary flow G can be made even stronger.

Next, FIG. 4 is a partial sectional view showing still another embodiment of the inner cylinder 13. A spiral blade 24 is provided inside the inner cylinder 13 shown in FIG. 4, and water holes 25 having a relatively large diameter are provided at the upper and lower parts of the inner cylinder 13. If you do it this way,
Due to the rotation of the inner cylinder 13, the drainage water 7 inside the inner cylinder 13 is
The water is pumped up from the bottom to the top by the pump action of the spiral vane 24, and the water is pumped up from the bottom to the top through the water passage hole 25 at the bottom of the inner cylinder 13.
The waste water 7 that has entered the inner cylinder 13 is discharged to the outside of the inner cylinder 13 from the water passage hole 25 at the top of the inner cylinder 13, which is effective for solid-liquid separation flowing vertically inside the separation tank 1. This is extremely advantageous because the generation of the secondary flow G can be further strengthened.

However, as a driving means for rotating the inner cylinder 13 around the vertical axis, a belt, a chain, etc. may be used, and the design of other structures can be changed as desired.

[Effects of the Invention] As specifically explained above, according to the present invention, it is possible to forcibly generate a strong primary flow swirling in the separation tank, and also to generate a secondary flow effective for solid-liquid separation. Since the flow rate can be increased, solids can be efficiently separated due to the synergistic effect of the primary flow and the secondary flow. In addition, the structure is relatively simple and can be manufactured at low cost, and there are few failures, and it can be operated stably and continuously for a long period of time. It has many advantages such as sewage and sewage, and is used to separate solids from wastewater containing solids such as sand and obtain a clean treated liquid, and is extremely effective in practice. A separation device can be provided.

[Brief explanation of drawings]

FIG. 1 is a sectional view taken along the line B-AB in FIG. 2 of a solid-liquid separator showing one embodiment of the present invention, and FIG. 2 is a sectional view taken along the line A-A in FIG. 1.
FIG. 3 is a cross-sectional view showing another embodiment of the inner cylinder, and FIG. 4 is a partial cross-sectional view showing still another embodiment of the inner cylinder. . 1...Separation tank, 2...Outer wall, 3...Bottom surface, 4...
...Solid matter reservoir, 5...Inflow port, 6...Solid matter, 7
...Drainage, 8...Inflow channel, 9...Outlet, 10...
... Treated liquid, 11 ... Discharge path, 12 ... Baffle plate,
13... Inner cylinder, 14... Hollow box, 15... Annular guide plate, 16... Vertical groove, 17... Water hole, 18...
Motor, 19... Ceiling plate, 20... Rotating shaft, 21
...Solid material transfer passage, 22...Vertical protrusion piece, 23...
... Vertical projection piece, 24 ... Spiral blade, 25 ...
Water hole, S...primary flow, G...secondary flow.

Claims (1)

[Claims] 1. An outer wall of a separation tank in which the outer wall is cylindrical or has an involute-shaped curved surface on a part of the cylindrical introduction side, the bottom surface slopes downward toward the center, and a concave solids reservoir is provided approximately at the center of the outer wall. In addition, an inlet is provided in the almost tangential direction to guide wastewater containing solids such as sand into the separation tank, and an outlet is provided to guide the treated liquid after solids have been separated from the separation tank to the outside. A circular inner cylinder is supported in the center of the tank so that a passage for moving solids toward the solids reservoir is formed between its lower end and the bottom of the separation tank, and the inner cylinder is rotated around a vertical axis. A solid-liquid separator characterized in that it is provided with a driving means for driving the solid-liquid separator.