JPH0331081B2 - - 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, the inner wall of the inlet passage that guides wastewater into the separation tank partially protrudes into the separation tank, so that the wastewater led into the separation tank 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 occurrence of turbulence around the outer wall of the primary flow swirling in the separation tank, and forcibly generates a 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 sloped downward toward the center, and a wall formed at approximately the center thereof. On the outer wall of the separation tank with a concave solids 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,
In the center of the separation tank, an inner cylinder with multiple water holes on the upper and lower surfaces is arranged, and in the center of the inner cylinder,
A solid-liquid separation device was constructed by installing a circulation pump that sends water from the bottom to the top, and providing a passage for moving solids toward the solids reservoir between the pedestal on which the lower end of the inner cylinder is placed and the bottom of the separation tank. It is characterized by this.

[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 causes 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 drainage water that gently swirls along the surface of the inner cylinder located in the center of the separation tank is drained from the water passage hole at the bottom of the inner cylinder by the action of the circulation pump installed inside the inner cylinder. It will be sucked in and expelled from the water hole at the top of the inner cylinder. As a result, a secondary flow that flows vertically in the separation tank and is effective for solid-liquid separation is forcibly generated, and the solids contained in the wastewater are removed by the synergistic effect of the primary flow and secondary flow. As a result, the solids efficiently settle to the bottom of the separation tank, pass through the solids transfer path, and accumulate 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,
Fin-shaped protrusions 13 are provided at equally divided positions in the circumferential direction, with fewer protrusions on the inlet 5 side and larger protrusions in the radial direction on the opposite side.

Further, a plurality of water passage holes 14 are provided on the upper and lower surfaces of the inner cylinder 12 sandwiched between the protruding pieces 13.

Further, a plurality of water passage holes 14 are provided on the upper and lower surfaces of the inner cylinder 12 sandwiched between the protruding pieces 13.

18 is a partition wall that partitions the inside of the inner cylinder 12 into upper and lower parts;
A circulation pump P ₀ is installed in the center of the inner cylinder 12 to feed the waste water 7 from the bottom to the top. However, instead of the partition wall 18, the circulation pump _P0 may be supported by an arm.

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 moving passageway that guides the solid matter 6 that has 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. .

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, the waste water 7 that is rapidly decelerated on the surface of the inner cylinder 12
is the circulation pump P ₀ installed inside the inner cylinder 12
As a result, water is sucked in through the water hole 14 at the bottom of the inner cylinder 12 and discharged from the water hole 14 at the top of the inner cylinder 12. As a result, a secondary flow G, which is effective for solid-liquid separation and flows vertically within the separation tank 12, is forcibly generated as shown in the figure, and the solids 6 contained in the waste water 7 are removed from the primary flow S. Due to the synergistic effect of the secondary flow G and the secondary flow G, it is efficiently separated and settles 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 Therefore, it overflows quietly and the discharge path 11
The water is then pumped up by pump _P2 and sent to the destination.

In this embodiment, fin-like protruding pieces 13 are provided that protrude radially in the radial direction along the longitudinal direction of the surface of the inner cylinder 12, which has a plurality of water passage holes 14 on the upper and lower surfaces. However, if you do this, the inner cylinder 1
Since the secondary flow circulating through the solid matter 2 is rectified, there is an advantage that the stability of the secondary flow effective for settling the solid matter 6 is further improved.

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 and the inner cylinder 1
Although the supporting method of No. 2 is not limited to the illustrated embodiment, as shown in this embodiment, the inner cylinder 12
When the lower end of the holder is placed on a bead-shaped mount 15 having a larger diameter than the inner cylinder 12, the mount 1
The upper surface of 5 becomes an inclined surface that guides the secondary flow G, and the lower surface of the pedestal 15 serves as a running water that guides a part of the secondary flow G and leads the solids 6 settled on the bottom surface 3 to the solids reservoir 4. This is extremely convenient since it can serve as a guiding slope.

[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 it can be forcibly generated, solids can be efficiently separated due to the synergistic effect with the primary 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
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, 14... Water hole, 15... Frame, 1
7... Solid material transfer passage, 18... Partition wall, P ₀ ...
Circulation pump, S...Primary flow, G...Secondary flow.

Claims (1)

[Claims] 1. The outer wall of a separation tank has a cylindrical or involute curved surface, the bottom slopes downward toward the center, and a concave solids reservoir is provided approximately at the center. Solids such as sand are contained on the outer wall of the separation tank. 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, an inner cylinder with multiple water passage holes on the upper and lower surfaces is installed in the center of the separation tank, and a circulation pump that feeds water from the bottom to the top is installed in the center of the inner cylinder. 1. A solid-liquid separator characterized in that a passage for moving solids toward a solids reservoir is provided between a pedestal on which the lower end of the separation tank is placed and a bottom surface of the separation tank.