JP2011083696A - Solid-liquid separator - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a solid-liquid separator, which improves an impurity-separation capacity from raw water and prevents the separated impurities from mixing again into treated water. <P>SOLUTION: The solid-liquid separator includes a liquid cyclone 11 allowing impurities contained in the raw water to settle out utilizing centrifugal force in swirling the raw water containing the impurities, an inlet pipe 10 connected to the upper part of the liquid cyclone and flowing the raw water into the liquid cyclone such that the raw water turn to a swirling flow, an impurity-recovering part 18 connected to the lower part of the liquid cyclone and recovering the settled impurities from the liquid cyclone, a barricade 16, 16E, 16F, 16G which blocks the returning of the recovered impurities from the impurity-recovering part to the liquid cyclone, an outlet pipe 20 connected to the upper part of the liquid cyclone and flowing out treated water after the settled impurities are recovered by the impurity-recovering part from the liquid cyclone, and an inner cylinder 30, 30B, 30C, 30D provided rotatably around the axis of the liquid cyclone in a lower flow passage of the liquid cyclone. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to a solid-liquid separator that separates and removes impurities from raw water.

  As an example of the water treatment process, a solid-liquid separation process such as gravity sedimentation, coagulation sedimentation, or pressurized flotation is used.

  In gravity sedimentation or coagulation sedimentation, raw water flows into the sedimentation tank, and the impurities that have a higher specific gravity than water are settled using the difference in specific gravity between the impurities to be separated and the water contained in the raw water. By using as the treated water, impurities and treated water are separated from the raw water. In this case, the sedimentation speed varies depending on the specific gravity and size of the impurities. For example, in the case of impurities with a slow sedimentation rate, the sedimentation rate can be improved by increasing the sedimentation rate by increasing the volume of the sedimentation tank, or by increasing the sedimentation efficiency using an inclined pipe or inclined plate. ing. On the other hand, even if the sedimentation efficiency is increased by using an inclined tube or an inclined plate as described above, a residence time of 1 hour or more is still required in the sedimentation tank, and not only there is a limit to shortening the residence time, There is also a problem with the size of the sedimentation tank.

  In addition, in the case of pressurized levitation, if there is levitation such as solid substances or fats and oils where the specific gravity of impurities is small, fine bubbles are generated by injecting air into the circulating water of the separation liquid and flowing it into the separation tank The impurities and the treated water are separated from the raw water by adhering to the impurities and floating and separating them. In this pressurized levitation, the rising speed of the impurities with bubbles attached is at most 200 mm / min. Therefore, there is a problem that the processing time becomes long even when the pressure is lifted.

  As described above, in order to shorten the processing speed which has been a problem in conventional weight settling and pressure flotation, for example, Patent Document 1 discloses that raw water is swirled in a container and impurities are centrifuged using centrifugal force. An apparatus is described.

Japanese Patent Laid-Open No. 11-333320

  However, in the conventional solid-liquid separation device, in order to obtain a strong centrifugal force, it is necessary to make the swirl flow high speed, and the high-speed flow causes a problem that impurities once separated are rolled up and re-mixed into the treated water. . Among the impurities, the flocs produced by using agglomerating agents such as aluminum and iron and polymer coagulant aids are fragile because they are low in strength and fragile, and high-speed water currents are attached to the inner wall of the cyclone and surrounding accessories. When it collides with the water, it breaks down into fine particles that easily re-mix into the treated water and flow out. Further, since the specific gravity of the floc is only slightly larger than the specific gravity of water, even if it has settled once, it tends to float. For this reason, there is a strong demand from users to prevent re-mixing and outflow of flocs with low strength and low specific gravity.

  The present invention has been made to solve the above-described problems, and has an object to provide an improved solid-liquid separation apparatus that improves the ability to separate impurities from raw water and prevents re-mixing of separated impurities into treated water. To do.

  (1) The solid-liquid separation device according to the present invention is connected to a liquid cyclone that precipitates impurities contained in the raw water using centrifugal force when the raw water containing impurities is swirled, and an upper part of the liquid cyclone, An inflow pipe for allowing the raw water to flow into the hydrocyclone so that the raw water turns into a swirl, an impurity recovery part connected to the lower part of the liquid cyclone and recovering the settled impurities from the liquid cyclone, and the recovered impurities are the impurities An obstacle that prevents the liquid cyclone from returning to the liquid cyclone and an upper portion of the liquid cyclone that is connected to the liquid cyclone and drains the treated water after the settled impurities are collected by the impurity recovery unit. An outflow pipe, and an inner cylinder rotatably provided around the axis of the liquid cyclone in the lower flow path of the liquid cyclone And features.

  In the present invention, when the swirl flow passes through the lower flow path of the hydrocyclone, the inner cylinder rotates with the swirl flow, and the relative speed difference between the swirl flow speed and the inner cylinder speed becomes smaller. The impact force when the impurity (floc) moving along with the flow contacts the inner cylinder surface is alleviated, and the impurity (floc) becomes difficult to break. As a result, the impurities (floc) are prevented from re-mixing into the treated water and flowing out, and the impurity recovery rate is improved.

  (2) In the invention of (1), it is preferable to have a bearing that rotatably supports the inner cylinder on the hydrocyclone. If the inner cylinder is lightweight, the inner cylinder can be rotated by the force received from the swirling flow against the sliding friction between the inner wall of the hydrocyclone, but the bearing can reduce the sliding friction between the inner cylinder and the inner wall of the hydrocyclone. By converting to rolling friction, the cylinder can be rotated more smoothly.

  (3) In the invention of any one of (1) and (2), it is preferable that the inner cylinder has a blade that receives a swirling flow and has a rotational force (FIGS. 3 and 4). By attaching blades to the inner cylinder, the inner cylinder is likely to receive the energy of the swirling flow, and the cylinder can be rotated at a higher speed.

  (4) In any one of the inventions (1) to (3), it is preferable to have a bearing that rotatably supports an obstacle on the hydrocyclone (FIG. 7). When the swirl flow passes through the lower flow path of the hydrocyclone to the impurity recovery section, it collides with the obstacle, but the obstruction rotates with the swirl flow, and the relative speed between the swirl flow speed and the obstacle speed The speed difference is reduced, and the impact force when the impurity (floc) moving with the swirling flow comes into contact with the surface of the obstacle is mitigated, and the impurity (floc) becomes difficult to break. As a result, the impurities (floc) are prevented from re-mixing into the treated water and flowing out, and the impurity recovery rate is improved.

  (5) In any one of the inventions (1) to (4), it is preferable that the obstacle has a blade that receives a swirling flow and has a rotational force (FIGS. 9 and 10). By attaching the blades to the obstacle, the obstacle easily receives the energy of the swirling flow, and the obstacle can be rotated at a higher speed.

  (6) In any one of the inventions (1) to (5), it is preferable to further include a rotating external force applying means for applying a rotating force in the same direction as the swirling flow from the outside of the hydrocyclone to the inner cylinder. When the rotational force (external force) in the same direction as the swirling flow is applied to the inner cylinder by the rotating external force applying means, the cylinder can be rotated at a higher speed. For example, a permanent magnet or an electromagnet can be used as the rotational external force applying means (FIGS. 5 and 6).

  (7) In the invention according to any one of (1) to (6), it is preferable to further include a rotating external force applying means for applying a rotating force in the same direction as the swirling flow to the obstacle from the outside of the hydrocyclone. When a rotational force (external force) in the same direction as the swirl flow is applied to the obstacle by the rotating external force applying means, the obstacle can be rotated at a higher speed. For example, a permanent magnet or an electromagnet can be used as the rotational external force applying means (FIG. 11).

  According to the present invention, when the swirl flow passes through the lower flow path of the hydrocyclone, the inner cylinder rotates with the swirl flow, and the relative speed difference between the speed of the swirl flow and the speed of the inner cylinder becomes small. , The impact force when the impurities moving along with the swirl flow come into contact with the inner cylinder surface is mitigated and the impurities are less likely to break. Separation recovery rate is improved.

The internal perspective sectional drawing which shows the solid-liquid separation apparatus which concerns on the 1st Embodiment of this invention. The top view which shows the obstruction seen from arrow AA of FIG. The internal see-through | perspective sectional drawing which shows the principal part of the solid-liquid separator which concerns on the 2nd Embodiment of this invention. The top view which shows the blade | wing attached to the lower part of the inner cylinder seen from arrow BB of FIG. The longitudinal cross-sectional block diagram which shows the solid-liquid separator which concerns on the 3rd Embodiment of this invention. The cross-sectional block diagram which shows the solid-liquid separator which concerns on the 4th Embodiment of this invention. The internal see-through | perspective sectional drawing which shows the principal part of the solid-liquid separator which concerns on the 5th Embodiment of this invention. (A) is a top view which shows the obstruction seen from arrow EE of FIG. 7, (b) is a perspective view which expands and shows the obstruction of FIG. The internal see-through | perspective sectional drawing which shows the principal part of the solid-liquid separator which concerns on the 6th Embodiment of this invention. The top view which shows the blade | wing attached to the lower part of the obstruction seen from the arrow FF of FIG. The longitudinal cross-sectional block diagram which shows the principal part of the solid-liquid separator which concerns on the 7th Embodiment of this invention.

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings.

(First embodiment)
A first embodiment of the present invention will be described with reference to FIGS.

  In the solid-liquid separation device 1A of this embodiment, raw water containing particles is introduced, and treated particles with less impurities are obtained by separating impurity particles (sand grains, metal powder, floc, etc.) from the raw water by centrifugal separation utilizing a specific gravity difference. Is a water treatment device for producing water. Among the impurities, the metal powder and sand particles have a specific gravity of about 2 to 10 and a diameter of about several millimeters to several micrometers. The floc has a specific gravity slightly larger than 1 and a diameter of about several millimeters to several tens of micrometers.

  As shown in FIG. 1, the solid-liquid separation device 1A according to the first embodiment includes a liquid cyclone 11, an inflow pipe 10 for flowing raw water into the liquid cyclone 11, an obstacle 16, an impurity recovery unit 18, An outflow pipe 20 through which treated water flows out from the hydrocyclone 11 and an inner cylinder 30A are provided.

  The hydrocyclone 11 includes a cylindrical portion 12, a conical portion 13, and a funnel portion 14 in order from the top, and is formed as a vertically long casing that decreases in diameter as it moves from the top to the bottom. The cylindrical portion 12 has the largest inner diameter among the liquid cyclones 11, the inflow pipe 10 communicates with the side peripheral portion, and a lid (not shown) is covered on the upper opening. The inflow pipe 10 extends outward along a tangent line in contact with the inner peripheral surface of the cylindrical portion 12. The conical part 13 has a large inner diameter at the top and gradually decreases in diameter as it moves downward, and is continuous with the lower part of the cylindrical part 12. The funnel portion 14 is formed so that the entire upper half portion of the conical shape and the lower half portion of the cylindrical shape are combined to form a funnel shape, and is continuous with the lower portion of the conical portion 13.

  The obstacle 16 is attached to an appropriate flow path between the impurity recovery part 18 and the funnel part 14 and has a role of preventing the recovered impurities from returning from the impurity recovery part 18 toward the liquid cyclone 11. is there. As long as the flow path is between the impurity recovery part 18 and the funnel part 14, the obstacle 16 may be attached at any position. In the apparatus 1A of the present embodiment, as shown in FIG. 1 and FIG. 2, the obstacle 16 is held by a holding part 17 made of a cage-shaped rod, and is input to the impurity recovery part 18 (outlet of the funnel part 14). ) It is arranged in the vicinity. Various obstacles such as a cone, a disk, a cylinder, a triangular pyramid, a quadrangular pyramid, and a rectangular plate can be used as the obstacle 16. Although the thickness of the obstacle 16 is not limited, it is preferably determined according to the pressure applied to the raw water, the holding force of the holding unit 17 and the like because it is easily damaged by the pressure applied to the raw water if it is too thin. .

  The impurity recovery part 18 is connected to the funnel part 14 below the hydrocyclone by a flange joint (not shown), and recovers the settled impurities from the liquid cyclone 11. A discharge line 21 is connected to the bottom of the impurity recovery unit 18, and a discharge valve 22 is opened to discharge the recovered impurities from the impurity recovery unit 18 to a reuse processing apparatus (not shown).

  The inner cylinder 30A is supported by the hydrocyclone 11 via a plurality of bearings 31 so as to be rotatable about the axis, and is disposed so as to cover at least the funnel part 14 so as to cover a part of the funnel part 14 and the conical part 13. ing. The inner cylinder 30A is substantially similar in shape to the lower part of the hydrocyclone 11, and has a uniform thickness. The material of the inner cylinder 30A may be any of resin, synthetic rubber, or metal material as long as it has excellent corrosion resistance and wear resistance. When the resin is used for the inner cylinder, a fluorine resin, a polyamide resin, a polybutylene resin, or the like can be used. When synthetic rubber is used for the inner cylinder, nitrile butadiene rubber, styrene butadiene rubber, urethane rubber, or the like can be used. Further, when a metal material is used for the inner cylinder, various metal materials having both corrosion resistance and wear resistance such as low alloy steel and stainless steel can be used.

  The operation of this embodiment will be described.

  The raw water flows into the cylindrical portion 12 of the hydrocyclone from the inlet pipe 10 in a state where a predetermined pump pressure is applied, and the direction of the flow is changed along the inner peripheral wall of the cylindrical portion 12 to form a swirling flow. While swirling along the inner peripheral wall of 13 and the inner peripheral wall of the inner cylinder 30A, impurities such as floc having a specific gravity greater than that of water gather at the center of the vortex, and are further narrowed down while rotating the inner cylinder 30A in the funnel portion 14. Then, the gas is sucked into the narrow flow path and flows into the impurity recovery unit 18 through the gap between the inner cylinder 30 </ b> A and the obstacle 16. Thereby, impurities (such as floc) are recovered. The collected impurities are discharged from the impurity collecting unit 18 to a sludge dewatering machine (not shown). On the other hand, the treated water after the impurities are separated is sent to the next process through the upper outflow pipe 20.

  A part of the raw water is supplied to the impurity recovery unit 18 together with the impurities to be recovered. At this time, in the conventional apparatus, the impurities (floc) collected by the impurity collecting unit 18 are collected by the impurity collecting unit 18 while colliding with the wall surface and the obstacle 16 while turning by the movement of the raw water. At this time, when a wall or an obstacle and a floc collide, there is a problem that the relative speed difference between the flow and the wall / obstacle is large, and the floc is broken. However, in the apparatus 1A of the present embodiment, as shown in FIG. 1, since the inner cylinder 30A rotates in the lower part of the hydrocyclone 11, the relative speed difference between the speed of the swirling flow and the speed of the inner cylinder 30A becomes small. The impact force when the floc moving with the swirling flow comes into contact with the surface of the inner cylinder 30A is alleviated and the floc becomes difficult to break.

  According to the apparatus of the present embodiment, by converting the sliding friction between the inner cylinder and the hydrocyclone inner wall to rolling friction by the bearing, the cylinder can be smoothly rotated, and the low-strength floc is not easily broken. Thus, it is avoided that the floc is mixed into the treated water and flows out, and the floc separation and recovery rate is improved.

(Second Embodiment)
A second embodiment of the present invention will be described with reference to FIGS. In addition, description of the part which this embodiment is in common with said embodiment is abbreviate | omitted.

  In the solid-liquid separator 1B of the present embodiment, as shown in FIG. 3, a blade 32 is attached to the lower end portion of the inner cylinder 30B. As shown in FIG. 4, four blades 32 are arranged at equal pitch intervals of 90 ° on the inner cylinder 30B.

  According to the apparatus of the present embodiment, by attaching blades to the inner cylinder, the inner cylinder can easily receive the energy of the swirling flow, and the inner cylinder can be rotated at a higher speed. The relative speed difference with the speed is further reduced, the impact force when the floc moving with the swirling flow comes into contact with the inner cylinder surface is relaxed, and the floc becomes difficult to break. For this reason, the outflow of the floc is suppressed and the floc recovery rate is improved.

(Third embodiment)
A third embodiment of the present invention will be described with reference to FIG. In addition, description of the part which this embodiment is in common with said embodiment is abbreviate | omitted.

  In the solid-liquid separation device 1C of the present embodiment, a pair of permanent magnets 33a and 33b are attached to the opposed positions of the upper portion of the inner cylinder 30C, and the operation is controlled by a control unit 35 having a moving mechanism (not shown). A pair of permanent magnets 34 a and 34 b are provided so as to be movable to positions facing each other outside the hydrocyclone 11. The outer permanent magnets 34 a and 34 b are moved around the hydrocyclone by the moving mechanism of the control unit 35. These two sets of permanent magnets (33a, 33b) and (34a, 34b) are disposed at the same height level with the wall material of the hydrocyclone interposed therebetween.

  The operation of the apparatus of this embodiment will be described.

  When the outer pair of permanent magnets 34a and 34b are moved around the hydrocyclone in the same direction as the swirling flow of water by the moving mechanism of the control unit 35, the inner pair of permanent magnets 33a is changed in accordance with the change in the magnetic force. 33b, an electromagnetic force is induced. When the electromagnetic force is induced in the permanent magnets 33a and 33b, a rotational force in the same direction as the swirling flow of water is applied to the inner cylinder 30C.

  According to the apparatus of this embodiment, two sets of permanent magnets as rotation external force applying means and a control unit having a moving mechanism are used to apply a rotational force (external force) in the same direction as the swirling flow to the inner cylinder. Further, it can be rotated at a high speed and a speed close to the swirl flow. For this reason, the collapse of the floc is suppressed, and the floc recovery rate is further improved.

(Fourth embodiment)
A fourth embodiment of the present invention will be described with reference to FIG. In addition, description of the part which this embodiment is in common with said embodiment is abbreviate | omitted.

  In the solid-liquid separation device 1D of the present embodiment, two pairs (four in total) of permanent magnets (36a, 36b) and (36a, 36b) are attached to the upper portion of the inner cylinder 30D at opposite positions, and are operated by the control unit 38. The other two pairs (a total of four) of electromagnets (37a, 37b) and (37a, 37b) are controlled at positions facing each other outside the hydrocyclone 11. The outer electromagnets (37a, 37b) and (37a, 37b) are configured to replace the magnetic poles at a predetermined cycle by the control unit. These permanent magnets (36a, 36b), (36a, 36b) and electromagnets (37a, 37b), (37a, 37b) are arranged at the same height level with the wall material of the hydrocyclone interposed therebetween.

  The operation of the apparatus of this embodiment will be described.

  When the magnetic poles of the outer electromagnets (37a, 37b), (37a, 37b) are replaced at a predetermined cycle by the control unit 38, the inner permanent magnets (36a, 36b), (36a, 36b) according to the change in the magnetic force. ) Electromagnetic force is induced. When the electromagnetic force is induced in the permanent magnets (36a, 36b), (36a, 36b), a rotational force in the same direction as the swirling flow of water is applied to the inner cylinder 30D.

  According to the apparatus of the present embodiment, the rotational force (external force) in the same direction as the swirling flow is imparted to the inner cylinder by the two pairs of permanent magnets, the two pairs of electromagnets and the control unit as the rotational external force imparting means. Further, it can be rotated at a high speed and a speed close to the swirl flow. For this reason, the collapse of the floc is suppressed, and the floc recovery rate is further improved.

(Fifth embodiment)
A fifth embodiment of the present invention will be described with reference to FIGS. In addition, description of the part which this embodiment is in common with said embodiment is abbreviate | omitted.

  In the solid-liquid separator 1E of the present embodiment, the bearing 41 is attached to the holding portion 17E that supports the obstacle 16E so that the obstacle 16E can be rotated around the axis. Further, as shown in FIGS. 8A and 8B, the obstacle 16E has a spiral groove 16g formed on the surface in the same direction as the direction of the swirl flow. The groove 16g having such a shape makes it easy for the obstacle 16E to receive the energy of the swirling flow, and the obstacle 16E rotates smoothly.

  According to the apparatus of the present embodiment, when the swirl flow passes through the lower part of the hydrocyclone, the swirl flow rotates the inner cylinder and also the obstacle, so the relative speed between the speed of the swirl flow and the speed of the inner cylinder. Not only does the difference become smaller, but the relative speed difference between the swirling flow speed and the obstacle speed also becomes smaller, and the impact force when the flock moving along with the swirling flow contacts the surface of the inner cylinder is reduced. It becomes difficult to break the frock. As described above, in this embodiment, the low-strength flocs are further prevented from being broken, and the flocs are prevented from being remixed in the treated water and flowing out, thereby improving the floc separation and recovery rate.

(Sixth embodiment)
A sixth embodiment of the present invention will be described with reference to FIGS. 9 and 10. In addition, description of the part which this embodiment is in common with said embodiment is abbreviate | omitted.

  In the solid-liquid separation device 1F of the present embodiment, as shown in FIG. 9, a blade 43 is attached to the lower end of the rotating shaft 16a of the obstacle 16F. As shown in FIG. 10, four blades 43 are arranged on the obstacle 16F at equal intervals of 90 °. Reference numeral 42 denotes a bearing that rotatably supports the rotating shaft 16a of the obstacle 16F.

  According to the apparatus of the present embodiment, by attaching blades to the obstacle, the obstacle easily receives swirl energy, and the obstacle can be rotated at a higher speed. The relative speed difference with the speed is further reduced, the impact force when the floc moving with the swirling flow comes into contact with the obstacle surface is relaxed, and the floc is hardly broken. For this reason, the outflow of the floc is suppressed and the floc recovery rate is further improved.

(Seventh embodiment)
A seventh embodiment of the present invention will be described with reference to FIG. In addition, description of the part which this embodiment is in common with said embodiment is abbreviate | omitted.

  In the solid-liquid separation device 1G of the present embodiment, as shown in FIG. 11, two pairs (four in total) of permanent magnets (44a, 44b) and (44a, 44b) are attached to the obstacle 16G so as to face each other. Two other pairs (four in total) of electromagnets (45a, 45b) and (45a, 45b) whose operations are controlled by the controller 46 are provided at positions facing each other outside the hydrocyclone 11. The outer electromagnets (45a, 45b), (45a, 45b) are configured to replace the magnetic poles at a predetermined cycle by the control unit 46. These permanent magnets (44a, 44b), (44a, 44b) and electromagnets (45a, 45b), (45a, 45b) are arranged at the same height level with the wall material of the hydrocyclone interposed therebetween.

  The operation of the apparatus of this embodiment will be described.

  When the magnetic poles of the outer electromagnets (45a, 45b), (45a, 45b) are exchanged at a predetermined period by the control unit 46, the inner permanent magnets (44a, 44b), (44a, 44b) are changed according to the change in the magnetic force. ) Electromagnetic force is induced. When the electromagnetic force is induced in the permanent magnets (45a, 45b) and (45a, 45b), a rotational force in the same direction as the swirling flow of water is applied to the obstacle 16G.

  According to the apparatus of the present embodiment, the two pairs of permanent magnets, the two pairs of electromagnets, and the control unit as the rotation external force applying means apply a rotation force (external force) in the same direction as the swirling flow to the obstacle, Can be rotated at a faster speed. For this reason, the outflow of the floc is suppressed and the floc recovery rate is further improved.

1A to 1G ... solid-liquid separator, 10 ... inflow pipe,
DESCRIPTION OF SYMBOLS 11 ... Hydrocyclone, 12 ... Cylindrical part, 13 ... Conical part, 14 ... Funnel part,
16, 16E, 16F, 16G ... obstacle, 16a ... rotating shaft, 16g ... groove,
17, 17E, 17F, 17G ... holding part,
18 ... Impurity recovery unit,
20 ... Outflow pipe, 21 ... Discharge line, 22 ... Valve,
30A, 30B, 30C, 30D ... inner cylinder, 31 ... bearing, 32 ... blade, 33a, 33b, 34b, 34b ... permanent magnet, 35 ... control unit, 36a, 36b ... permanent magnet, 37b, 37b ... electromagnet, 38 ... Control unit,
41, 42 ... bearings, 43 ... blades, 44a, 44b ... permanent magnets, 45a, 45b ... electromagnets, 46 ... control unit.

Claims (7)

A hydrocyclone that sediments impurities contained in the raw water using centrifugal force when the raw water containing impurities is swirled;
An inflow pipe connected to the upper part of the hydrocyclone and allowing the raw water to flow into the hydrocyclone so that the raw water becomes a swirling flow;
An impurity recovery unit connected to a lower part of the hydrocyclone and recovering the settled impurities from the hydrocyclone;
An obstacle that prevents the recovered impurities from returning from the impurity recovery section toward the hydrocyclone;
An outflow pipe connected to the upper part of the hydrocyclone and for allowing the treated water after the settled impurities are collected in the impurity collecting section to flow out of the hydrocyclone;
An inner cylinder rotatably provided around the axis of the liquid cyclone in the lower flow path of the liquid cyclone;
A solid-liquid separation device comprising:   The solid-liquid separator according to claim 1, further comprising a bearing that rotatably supports the inner cylinder on the liquid cyclone.   The solid-liquid separator according to any one of claims 1 and 2, wherein the inner cylinder has blades that receive a swirling flow and have a rotational force.   The solid-liquid separator according to any one of claims 1 to 3, further comprising a bearing that rotatably supports the obstacle on the liquid cyclone.   The solid-liquid separator according to any one of claims 1 to 4, wherein the obstacle has blades that receive a swirling flow and have a rotational force.   The solid-liquid separator according to any one of claims 1 to 5, further comprising a rotational external force imparting means for imparting a rotational force in the same direction as the swirling flow to the inner cylinder from the outside of the hydrocyclone.   The solid-liquid separator according to any one of claims 1 to 6, further comprising a rotating external force applying means for applying a rotating force in the same direction as a swirling flow to the obstacle from the outside of the liquid cyclone.

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