JPH0363401B2 - - 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, in the conventional solid-liquid separator, a part of the liquid inside the inflow channel that leads wastewater into the separation tank protrudes into the separation tank, and the wastewater led into the separation tank is Since a part of the water does not go directly to the discharge port, the protrusion causes turbulence in the waste water swirling along the outer wall of the separation tank, resulting in poor solid-liquid separation efficiency.

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 was proposed in view of the above-mentioned conventional drawbacks, and eliminates the generation of turbulence around the outer wall of the primary flow swirling in the separation tank, and strengthens the generation of the secondary flow that is effective for solid-liquid separation. The purpose of this invention is to improve the solid-liquid separation efficiency and provide a practically effective solid-liquid separation device.

[Means for Solving the Problems] In order to solve the above-mentioned 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 wall formed at approximately the center thereof. On the outer wall of the separation tank, which has a concave solid matter reservoir,
An inlet that leads wastewater containing solids such as sand into the separation tank from a tangential direction, and a discharge port that leads the treated liquid after solids have been separated from the separation tank to the outside.The discharge port is located downstream of the inlet. In addition to being located above,
A hollow inner cylinder with a water passage hole provided at least on the upper side is arranged in the center of the separation tank, and a solid material reservoir is placed between the base on which the lower end of the inner cylinder is placed and the bottom of the separation tank. This is characterized in that a solid-liquid separator is constructed by providing a passage for moving solids toward the solid material.

[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 in a tangential direction does not cause turbulent flow along the outer wall within the separation tank. The treated liquid is discharged from the discharge port located downstream and above the inlet without directly colliding with the inflowing wastewater.

In addition, the rotation of the primary flow inside the separation tank becomes slow due to the resistance on the surface of the cylinder installed in the center of the separation tank, and the circumferential velocity of the primary flow from the outside to the inside of the separation tank decreases. The degree of change increases. As a result, the generation of secondary flow that flows vertically in the separation tank and is effective for solid-liquid separation is strengthened, and the solids contained in the wastewater are efficiently removed by the synergistic effect of the primary flow and secondary flow. It often settles to the bottom of the separation tank, passes through the solids transfer passage, and accumulates in the solids reservoir.

[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. Reference numeral 5 denotes an inlet provided on the outer wall 2 of the separation tank 1, and is connected to an inflow path 8 for guiding waste water 7 containing solid matter 6 such as sand into the separation tank 1 from a tangential direction.

9 is a discharge port provided on the outer 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.

Note that the discharge port 9 is located downstream of the inlet 5 when viewed from the flow swirling in the separation tank 1;
It is located higher up.

Reference numeral 12 denotes an inner cylinder with a relatively large diameter, which is provided, for example, concentrically in the center of the separation tank 1, and on its surface, it is divided into equally divided positions in the circumferential direction, with a smaller number on the inlet port 5 side.
On the opposite side, a fin-like protrusion piece 13 that protrudes radially in a large radial direction is provided.

Further, on the surface of the inner cylinder 12 sandwiched between the protruding pieces 13, water passage holes 14 are provided so as to be densely arranged in the upper and lower directions.

Reference numeral 15 denotes a bead-shaped pedestal on which the lower end of the inner cylinder 12 is placed, and is attached to the bottom surface 3 of the separation tank 1 via support legs 16.
is installed on top. 17 is provided between the frame 15 at the lower end of the inner cylinder 12 and the bottom surface 3 of the separation tank 1;
This is a solid matter movement passageway that guides the solid matter 6 that has settled on the bottom surface 3 to the fixed 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. .

Note that in the figure, S 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 waste water 7 guided from the inflow port 5 into the separation tank 1 from the tangential direction through the inflow path 8 flows along the outer wall 2 inside the separation tank 1. The primary flow S swirls as shown, but the flow swirling around the inner cylinder 12 disposed at the center of the separation tank 1 is rapidly rotated by the projection piece 13 provided on the surface of the inner cylinder 12. The speed is reduced, and a portion of the solid matter 6 collides with the protrusion piece 13 and settles down. In addition, since the swirling flow is rapidly decelerated on the surface of the inner cylinder 12, the degree of change in the circumferential velocity of the primary flow S from the outside to the inside of the separation tank 1 increases, causing the inside of the separation tank 1 to move vertically. Secondary flow G flowing to
The occurrence of becomes stronger. Therefore, the solids 6 contained in the waste water 7 are efficiently separated by the synergistic effect of the primary flow S and the secondary flow G, and settle on the bottom surface 3 of the separation tank 1.

In addition, the solid matter 6 that has settled on the bottom surface 3 of the separation tank 1
is gradually pushed to the center by the secondary flow G, and passes through the solid matter transfer passage 17 to the solid matter reservoir 4.
and will be appropriately discharged by the discharge pump _P1 . In this way, the solid matter 6 is sequentially sedimented and separated, and the purified treated liquid 10 does not collide directly with the waste water 7 flowing in from the inlet 5, and the discharge port 9 located downstream and above the inlet 5 As a result, the water overflows quietly and is discharged into the discharge channel 11, and is pumped up by the pump _P2 and sent to the destination.

In this embodiment, the water passage holes 14 are provided on the surface of the inner cylinder 12 so as to be densely arranged in the upper and lower directions. , there is an advantage that the secondary flow G becomes stronger and stabilized.

However, it has been confirmed that it is effective even if the inner cylinder 12 is a simple cylinder, but as a means to rapidly decelerate the flow swirling around the inner cylinder 12, for example, It is possible to provide unevenness, dotted unevenness, grooves or hemispherical grooves, or holes of various shapes that communicate with the inside of the cylinder 12, and these can be combined as necessary. By adopting this shape, the strength of the secondary flow G can be optimally set.

Also, if a filter is installed at the discharge port 9,
It is extremely convenient that even minute solid matter 6 that may flow down the discharge port 9 can be completely removed.

Further, in this embodiment, the inflow channel 8 is curved, but it may be straight, or a gravity flow method may be used, or the waste water 7 may be forcibly guided into the separation tank 1 by a pump. good. In addition, the uneven shape provided on the surface of the inner cylinder 12, the method of supporting the inner cylinder 12, etc.
The present invention is not limited to the illustrated embodiment, and the design can be changed as necessary.

[Effects of the Invention] As specifically explained above, according to the present invention, turbulence does not occur around the outer wall of the primary flow swirling in the separation tank, and the secondary flow is effective for solid-liquid separation. Since the generation can be strengthened, solids can be efficiently separated by the synergistic effect of the primary flow and the secondary flow.

In addition, the inner cylinder is formed into a hollow shape, and a part of the secondary flow flows in from the bottom and is discharged from the upper water hole, which has the advantage of making the secondary flow stronger and more stable. be.

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
It can be used to separate solids from wastewater containing solids such as sand, such as sewage or sewage, to obtain a clean treated liquid, and can provide a practically extremely effective solid-liquid separation device. It is.

[Brief explanation of 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. 1...Separation tank, 2...Outer wall, 3...Bottom surface, 4...
...Solid matter reservoir, 5...Inflow port, 6...Solid matter, 7
... Drainage, 9 ... Outlet, 10 ... Treated liquid, 1
2... Inner cylinder, 13... Projection piece, 15... Frame, 1
7...Solid material transfer passage, S...Primary flow, G...
Secondary flow.

Claims (1)

[Claims] 1 The outer wall of a separation tank has a cylindrical or involute-shaped curved surface, the bottom faces the center and slopes downward, and a concave solids reservoir is provided in the center. An inlet that introduces wastewater into the separation tank tangentially, and an outlet that guides the treated liquid after separating solids from the separation tank to the outside are provided so that the outlet is located downstream and above the inlet. At the same time, a hollow inner cylinder with a water passage hole provided at least on the upper side is arranged in the center of the separation tank, and a solid material is placed between the base on which the lower end of the inner cylinder is placed and the bottom of the separation tank. A solid-liquid separator characterized in that a solid matter moving path toward a reservoir is provided.