JP2020093230A - Solid-liquid separation device, solid-liquid separation method, water quality measuring device, and water quality measuring method - Google Patents

Abstract

To provide a solid-liquid separation device which achieves excellent separation performance of particles, each having density close to that of a fluid, from the fluid, and to provide a solid-liquid separation method.SOLUTION: A solid-liquid separation device 1 includes a bending channel 10 serving as separation means for separating a processed liquid containing solid particles into a concentrated liquid containing the solid particles and a process liquid. The bending channel 10 has a passage including a wall surface having a curvature. A part of an inner wall surface of the passage is a slip wall surface.SELECTED DRAWING: Figure 1

Description

The present invention relates to a solid-liquid separation device for separating a solid and a liquid, a solid-liquid separation method, and a water quality measuring device and a water quality measuring method using the solid-liquid separation device or the solid-liquid separation method.

A solid-liquid separation device that separates solids and liquids, which is a system that separates neutral buoyant particles that have the same density as a fluid from a fluid, where the centrifugal force is introduced so that the neutral buoyant particles move from the center of the channel to the center of the spiral of the channel. A spiral channel having a curved channel shape adapted to form a laterally offset tubular band in the fluid, a first outlet for the fluid through which the tubular band flows, and a remaining fluid for the remaining fluid A second outlet, wherein the tubular band flows in the spiral channel asymmetrically based on the centrifugal force, wall lift and Suffman inertial lift, Magnus force equilibrium, and due to the generation of the Dean vortex, and the fluid is a liquid. Is known (see Patent Document 1).

In the system of Patent Document 1, if the equilibrium of the respective forces is unstable or the development of the Dean vortex is insufficient, the particle separation performance is significantly reduced. Further, the system of Patent Document 1 is a system for separating neutral buoyancy particles having the same density as the fluid from the fluid, but the separation performance of particles having a density different from the fluid but close to the fluid is not sufficient.

Japanese Patent No. 5731096

An object of the present invention is to provide a solid-liquid separation device and a solid-liquid separation method which are excellent in the separation performance of particles having a density close to that of a fluid, and a water quality measuring device and water quality using the solid-liquid separation device or the solid-liquid separation method. It is to provide a measuring method.

The present invention is a solid-liquid separator having a separating means for separating a liquid to be treated containing solid particles into a concentrated liquid containing the solid particles and a treatment liquid, wherein the separating means has a wall surface having a curvature. The solid-liquid separation device has a flow path including the flow path, and a part of the inner wall surface of the flow path is a slip wall surface.

In the solid-liquid separation device, the separation means has a flow path including an upper wall surface, a lower wall surface, and a side wall surface having a curvature, and at least a part of the upper wall surface or the lower wall surface is a slip wall surface. preferable.

In the solid-liquid separation device, the wall surface flow velocity on the slip wall surface is preferably larger than zero.

In the solid-liquid separation device, the slip wall surface is preferably a wall surface subjected to a water repellent treatment or a wall surface using a water repellent material.

The present invention comprises the solid-liquid separation device and a treatment liquid quality measuring means for measuring the quality of the treatment liquid, wherein the treatment liquid quality measuring means is turbidity, chromaticity, organic matter concentration, particle diameter, And a water quality measuring device which is a means for measuring at least one of the particle size distribution.

The present invention includes a separation step of separating a liquid to be treated containing solid particles into a concentrated liquid containing the solid particles and a treatment liquid, wherein the separation step is performed using a flow path including a wall surface having a curvature, This is a solid-liquid separation method in which a part of the inner wall surface of the flow path is a slip wall surface.

In the solid-liquid separation method, the separation step is performed using a flow path including an upper wall surface, a lower wall surface, and a side wall surface having a curvature, and at least a part of the upper wall surface or the lower wall surface is a slip wall surface. Is preferred.

In the solid-liquid separation method, it is preferable that the wall surface flow velocity on the slip wall surface is larger than zero.

In the solid-liquid separation method, the slip wall surface is preferably a wall surface subjected to a water repellent treatment or a wall surface using a water repellent material.

The present invention includes the solid-liquid separation method and a treated water quality measuring step of measuring the water quality of the treated water, wherein in the treated water quality measuring step, turbidity, chromaticity, organic matter concentration, particle diameter, and particle diameter. It is a water quality measuring method which measures at least one of distributions.

In the present invention, a solid-liquid separation device and a solid-liquid separation method having excellent separation performance from a fluid of particles having a density close to that of the fluid, and a water quality measuring device and a water quality measuring method using the solid-liquid separation device or the solid-liquid separation method Can be provided.

It is a schematic structure figure showing an example of a solid-liquid separation device concerning an embodiment of the present invention. It is a schematic diagram showing an example of a channel cross section of a bent channel in a solid-liquid separation device concerning an embodiment of the present invention. (A) is a schematic diagram showing a flow velocity distribution on a non-slip surface, and (b) is a schematic diagram showing a flow velocity distribution on a slip surface. It is a schematic structure figure showing an example of the aggregation separation device concerning an embodiment of the present invention. It is the schematic which shows an example of the aggregation condition determination method by the conventional jar test.

Embodiments of the present invention will be described below. This embodiment is an example for carrying out the present invention, and the present invention is not limited to this embodiment.

An outline of an example of a solid-liquid separation device according to an embodiment of the present invention is shown in FIG. 1, and its configuration will be described.

The solid-liquid separation device 1 according to the present embodiment has a curved channel 10 as a separation means for separating a liquid to be treated containing solid particles into a concentrated liquid containing solid particles and a treatment liquid. The curved channel 10 has a flow path including a wall surface having a curvature, and a part of the inner wall surface of the flow path is a slip wall surface. The solid-liquid separator 1 may have an outlet line 14 for taking out the concentrated liquid in which the solid particles are concentrated from the curved channel 10 and a processing liquid line 16 for taking out the processing liquid from the curved channel 10.

In the solid-liquid separation device 1 shown in FIG. 1, the liquid to be processed 12 is connected to the liquid to be processed inlet of the curved channel 10. An outlet line 14 is connected to the concentrated liquid outlet of the curved channel 10, and a processing liquid line 16 is connected to the processing liquid outlet.

The operation of the solid-liquid separation method and the solid-liquid separation device 1 according to this embodiment will be described.

In the solid-liquid separation device 1 of FIG. 1, the liquid to be treated containing solid particles is sent to the curved channel 10 through the liquid to be treated line 12.

The liquid to be treated is introduced from the liquid to be treated inlet of the curved channel 10 into the flow channel of the spiral channel, and when flowing through the flow channel, due to the density difference between the solid particles and the liquid, gravity and hydrodynamic action, For example, the treatment liquid on the outer peripheral side of the flow channel and the concentrated liquid on the inner peripheral side of the flow channel are separated (separation step). The concentrated liquid is discharged through the outlet line 14, and the treatment liquid is discharged through the treatment liquid line 16 (separation step).

The curved channel 10 has a liquid inlet for introducing the liquid to be treated, a spiral channel in which a pipe having, for example, a rectangular flow path for the fluid to flow is formed in a spiral shape, and the curved liquid 10 is discharged. For this purpose, there are a treatment liquid outlet separated from, for example, the outer peripheral side of the flow channel, and a concentrated liquid outlet separated from, for example, the inner peripheral side of the flow channel for discharging the concentrated liquid. FIG. 2 shows a cross section of the flow channel of the curved channel 10. When the liquid to be treated containing solid particles is introduced into the spiral channel from the liquid inlet of the liquid to be treated, a secondary flow ( Dean vortex) occurs. This is due to the outward flow due to the centrifugal force and the inward pressure due to the flow that is going straight ahead being forcibly bent by the outer wall.

Solid particles are supposed to gather on the inner circumference side in this secondary flow (Dean vortex), but depending on the balance of the density of solid particles, the flux of the fluid flowing in the channel, the curvature of the channel, etc. In some cases, particles may gather on the outer peripheral side. In this case, the curved channel 10 may have a processing liquid outlet separated from the inner peripheral side of the flow channel and a concentrated liquid outlet separated from the outer peripheral side of the flow channel. The bending channel 10 adjusts the density of the solid particles in the bending channel 10, the flux of the fluid flowing in the flow path, the balance of the curvature of the flow path, and the like to adjust the density difference between the solid particles and the liquid, and gravity. By the hydrodynamic action, the solid particles can be separated from the liquid to be treated.

In the solid-liquid separation device 1 according to this embodiment, a part of the inner wall surface of the flow path of the curved channel 10 is a slip wall surface. For example, one of the upper and lower inner wall surfaces of the flow path of the bent channel 10 is a slip surface, and the remaining inner wall surface is a non-slip surface. When the viscous fluid is passed, the wall velocity becomes zero on the untreated wall surface due to the fluid frictional resistance. This is called a non-slip surface (see FIG. 3(a)). On the other hand, for example, the water-repellent wall surface has the effect of reducing the fluid frictional resistance, so that the wall surface flow velocity does not become zero. This is called a slip surface (see FIG. 3B). For example, when the cross section of the channel is rectangular as shown in FIG. 2, the lower inner wall surface of the channel of the curved channel 10 is a slip surface, and the remaining three inner wall surfaces (upper inner wall surface and inner wall surfaces on both sides) are non-slip. Is a face. For example, when the cross section of the flow channel is circular or elliptical, the lower inner wall surface of the flow channel of the curved channel 10 is a slip surface, and the remaining inner wall surface is a non-slip surface. In addition, the lower inner wall surface when the cross section of the flow path is circular or elliptic means the lower half of the flow path. In addition, the lower inner wall surface refers to a surface located on the lower side (gravitational direction) when the solid-liquid separation device 1 is used.

Since a part of the inner wall surface of the flow channel of the curved channel 10 is a slip wall surface, the return flow to the inner side of the flow channel in the Dean vortex at the lower portion of the flow channel is weakened and the outer lower portion of the flow channel is lower than in the conventional curved channel. The solid particles are easily collected and the solid-liquid separation accuracy is improved. Therefore, the performance of separating particles having a density close to that of the fluid from the fluid is excellent.

The wall flow velocity on the slip wall surface of the flow channel of the curved channel 10 may be larger than zero.

Examples of the method of using the inner wall surface of the flow path as the slip wall surface include a water repellent finish treatment with a fluororesin, a silicone resin, or the like, and the use of a water repellent material such as a fluororesin or a silicone resin.

The curved channel 10 is not particularly limited as long as it has a flow path including a wall surface having a curvature. The curved channel 10 is, for example, a pipe in which a flow path including a wall surface having a curvature is formed in a spiral shape. The cross-sectional shape of the flow channel of the curved channel 10 may be rectangular, circular, elliptical, or the like, and it is desirable that the cross-sectional shape of the flow channel is rectangular in order to form a Dean vortex. That is, it is preferable that the curved channel 10 has a flow path including an upper wall surface, a lower wall surface, and a side wall surface having a curvature, and at least a part of the upper wall surface or the lower wall surface is a slip wall surface.

The curved channel 10 preferably has a predetermined curvature, length, and width that are determined according to the purpose of separating solid particles.

Since the specification of the curved channel that is most suitable for the separation of solid particles changes depending on the properties (density, particle size, etc.) of the solid particles, it is desirable to determine it using flow analysis software. Examples of the flow analysis software include "ANSYS Fluent" (ANSYS).

As described above, the solid particles can be separated by adjusting the balance of the density of the solid particles in the curved channel 10, the flux of the fluid flowing in the flow channel, the curvature of the flow channel, and the like.

The solid-liquid separation method and solid-liquid separation apparatus according to the present embodiment may be processed with any liquid containing solid particles, and are not particularly limited. For example, it can be used in solid-liquid separation in coagulation separation treatment, selective control and separation of solid particles in centimeter-micrometer size pipes and channels, and the like.

The solid-liquid separation method and the solid-liquid separation apparatus according to the present embodiment may be used to perform coagulation separation treatment or water quality measurement in the coagulation separation treatment. An example is shown below.

A water quality measuring device according to an embodiment of the present invention comprises the solid-liquid separation device and a treatment liquid quality measuring means for measuring the quality of the treatment liquid, and the treatment liquid quality measuring means has turbidity, chromaticity, It is a means for measuring at least one of the organic substance concentration, the particle size, and the particle size distribution. The water quality measuring device is, for example, a coagulant addition means for adding a coagulant to the water to be treated, and a separation means for separating the concentrated water containing the flocs formed by adding the coagulant and the treated water. And a treated water quality measuring means for measuring the water quality of the treated water; and the separating means is the solid-liquid separation device. The coagulation/separation device may further include a mixing means for mixing the water to be treated and the coagulant, and a floc forming means for forming flocs in the mixed admixture. You may use the said solid-liquid separation device as a mixing means and a floc formation means.

The water quality measuring method according to the embodiment of the present invention includes the solid-liquid separation method and a treated water quality measuring step of measuring the quality of treated water, in the treated water quality measuring step, turbidity, chromaticity, organic matter concentration, It is a method of measuring at least one of a particle size and a particle size distribution. The water quality measuring method includes, for example, a flocculating agent addition step of adding a flocculant to the water to be treated, and a separation step of separating concentrated water containing flocs formed by adding the flocculant and treated water. A separation method; and a treated water quality measuring step of measuring the quality of treated water, wherein the solid-liquid separation device (the solid-liquid separation method) is used in the separation step. The coagulation-separation method may further include a mixing step of mixing the water to be treated and a coagulant, and a floc forming step of forming flocs in the mixed admixture. The solid-liquid separation device may be used in the mixing step and the floc forming step.

An outline of an example of the water quality measuring device according to the present embodiment is shown in FIG. 4, and its configuration will be described.

The water quality measuring device 3 shown in FIG. 4 is, for example, a coagulant adding pipe 30 as a coagulant adding means for adding a coagulant to the water to be treated, and a line mixer as a mixing means for mixing the coagulant and the water to be treated. 18, the floc forming means for forming flocs in the mixed admixture, and the solid-liquid separation device 1 as the separating means for separating concentrated water containing the formed flocs and treated water, and the water quality of the treated water. A treated water quality measuring device 20 is provided as a treated water quality measuring means for measuring the.

In the water quality measuring device 3 of FIG. 4, the treated water pipe 22 is connected to the inlet of the line mixer 18. The outlet of the line mixer 18 and the mixed liquid inlet of the curved channel 10 are connected by a mixed liquid pipe 24. A concentrated water pipe 26 is connected to the concentrated water outlet of the curved channel 10, and a treated water pipe 28 is connected to the treated water outlet. A coagulant-added pipe 30 is connected to the treated water pipe 22. A treated water quality measuring device 20 is installed in the treated water pipe 28.

The operation of the water quality measuring method according to this embodiment and the water quality measuring device 3 including the solid-liquid separation device 1 will be described.

In the water quality measuring device 3 of FIG. 4, the water to be treated containing suspended substances and the like is sent to the line mixer 18 through the pipe to be treated 22. Here, in the treated water pipe 22, the coagulant is added to the treated water through the coagulant addition pipe 30 (coagulant addition step), and in the line mixer 18, the coagulant and the treated water are stirred and mixed. (Mixing process). The mixed liquid in which the coagulant and the water to be treated are mixed is sent to the curved channel 10 through the mixed liquid pipe 24.

The admixture was introduced from the admixture inlet of the curved channel 10 into the flow channel of the spiral channel, agitated by the hydrodynamic action in the flow channel, and formed by admixing and aggregating the coagulant and the water to be treated. The fine flocs collide with each other and the particle size of the flocs grows (floc forming step). As it flows through the flow channel, it is separated into treated water on the outer peripheral side of the flow channel and concentrated water on the inner peripheral side of the flow channel, for example, due to the density difference between water and flocs, and gravity and hydrodynamic action. (Separation step). The concentrated water is discharged through the concentrated water pipe 26, and the treated water is discharged through the treated water pipe 28 (the above is the aggregation separation step).

Next, in the treated water pipe 28, the treated water quality measuring device 20 measures the quality of the treated water (treated water quality measuring step).

Figure 5 uses a tester called a jar tester equipped with multiple stirring blades that can control the number of revolutions, and determines the optimum amount of flocculant to be added for flocculation and solid-liquid separation. The outline of an example of a method is shown. The evaluation water quality measuring device 100 includes an evaluation mixing tank 102 as an evaluation mixing means, an evaluation floc forming tank 104 as an evaluation floc forming means, and an evaluation solid-liquid separation device 106 as an evaluation separating means. An evaluation aggregation/separation device 110; and a treated water quality measuring device 108 as a treated water quality measuring means. For example, in the evaluation mixing tank 102, a flocculant is added to and mixed with the water to be treated, flocs are formed in the evaluation floc forming tank 104, and sedimentation separation by gravity or filtration is performed in the evaluation solid-liquid separation device 106 by gravity. Solid-liquid separation is performed to separate concentrated water and treated water. The quality of the treated water is measured by the treated water quality measuring device 108.

The conventional auto jar tester has a large number of parts, has poor maintainability, and is expensive. In addition, the jar tester can simultaneously test 4 to 6 conditions. However, in one test, in the conventional jar test, for example, 3 minutes for mixing, 10 minutes for floc formation, and 10 minutes for solid-liquid separation. 10 minutes, 10 minutes for measurement of treated water, 33 minutes or more in total. In the actual coagulation/separation process, when the coagulation condition is determined by the conventional jar test according to the treated water quality of the treated water, and when there is a sudden change in the water quality of the treated water, a total of 30 minutes or more is required for the jar test. In some cases, a delay occurs, which makes it impossible to follow a rapid change in the water quality of the water to be treated, and the quality of the treated water deteriorates.

By the solid-liquid separation device 1 according to this embodiment, it is possible to perform coagulation separation at high speed. By using the water quality measuring device 3 including the solid-liquid separation device 1 as a jar tester or an auto jar tester for performing a test for determining the optimum amount of coagulant added for aggregation, solid-liquid separation, etc. The speed can be increased, and the aggregating conditions and the like of the aggregating and separating treatment can be quickly determined based on the water quality of the treated water measured by the treated water quality measuring device 20. Therefore, even if there is a change in the water quality of the water to be treated, in particular even if there is a sudden change in the water quality of the water to be treated, it is possible to follow the optimum flocculation conditions, and the deterioration of the quality of the treated water is suppressed. The jar test can be performed in-line, and the optimum coagulation-separation processing conditions can be continuously determined.

In the water quality measuring device 3 of FIG. 4, the mixing (mixing step) of the coagulant and the water to be treated is performed using the line mixer 18, but instead of the line mixer 18, a stirring device having a stirring blade or the like. The agitation tank provided with may be used as the mixing means, or the same bending channel 10 as the floc forming means and the separating means or the bending channel different from the floc forming means and the separating means may be used as the mixing means.

In the water quality measuring device 3 of FIG. 4, the flock forming means and the separating means are curved channels, but the mixing means, the flock forming means and the separating means may be curved channels. That is, although the floc forming step and the separating step are performed using the bent channel, the mixing step, the flock forming step and the separating step may be performed using the bent channel.

In the water quality measuring device 3 of FIG. 4, the time required for the mixing step of mixing the coagulant and the water to be treated is, for example, about 1 second to 60 seconds, preferably about 5 seconds to 30 seconds, and includes the coagulant. The time required for the floc formation step of forming flocs in the water to be treated is, for example, about 10 seconds to 10 minutes, preferably about 1 minute to 5 minutes, and the time required for the separation step of separating concentrated water and treated water. Is, for example, about 1 second to 5 minutes, preferably about 1 second to 10 seconds, and the time required for the treated water quality measurement step of measuring the treated water quality is, for example, about 1 second to 30 seconds. Therefore, the time required from the mixing step to the treated water quality measuring step is about 10 seconds to 3 minutes, preferably about 10 seconds to 60 seconds.

As described above, the flocs can be formed and separated by adjusting the balance of the density of particles in the curved channel 10, the flux of the fluid flowing in the flow channel, the curvature of the flow channel, and the like. The agent and the water to be treated can be mixed, flocs can be formed and separated. For example, in bending channel 10, flock formation and separation can be performed in a continuous bending channel by asymptotically starting from a small curvature towards the optimum curvature for separation. You may make the cross-sectional area of a flow path asymptotic toward an optimal value. In a narrow channel, the flux is high and agitation is performed, and in a channel whose cross-sectional area is optimal for separation, separation is performed.

The water quality measuring device 3 of FIG. 4 may be used as it is as a coagulation/separation device, or the water quality measuring device 3 of FIG. 4 excluding the treated water quality measurement device 20 may be used as a coagulation/separation device. For example, the flocculation separator is a flocculant addition means for adding a flocculant to the water to be treated, and a separation means for separating concentrated water containing flocs formed by adding the flocculant and treated water. , And the separation means is the solid-liquid separation device. The coagulation/separation device may further include a mixing means for mixing the water to be treated and the coagulant, and a floc forming means for forming flocs in the mixed admixture. You may use the said solid-liquid separation device as a mixing means and a floc formation means. Further, the coagulation separation method includes a coagulant addition step of adding a coagulant to the water to be treated, a separation step of separating the concentrated water containing flocs formed by adding the coagulant and the treated water, The solid-liquid separation device (solid-liquid separation method) is used in the separation step. The coagulation-separation method may further include a mixing step of mixing the water to be treated and a coagulant, and a floc forming step of forming flocs in the mixed admixture. The solid-liquid separation device may be used in the mixing step and the floc forming step.

As the aggregating agent, at least one of an inorganic aggregating agent and a polymer aggregating agent is used.

Examples of the inorganic flocculants include ferric chloride, polyferric sulfate and other iron-based inorganic flocculants, aluminum sulfate, polyaluminum chloride (PAC) and other aluminum-based flocculants, and the like.

The addition amount of the inorganic coagulant is, for example, in the range of 1 to 100 mg/L.

The polymer coagulant is not particularly limited, such as a nonionic polymer coagulant, an anionic polymer coagulant or a cationic polymer coagulant, for example, polyacrylamide, sodium polyacrylate, acrylamide Examples thereof include acrylate copolymer, sodium acrylamidopropane sulfonate, chitosan, dimethylaminoethyl methacrylate, dimethylaminoethyl acrylate, polyamidine and the like. The polymer flocculants may be used alone or in combination of two or more.

The amount of the polymer flocculant added is, for example, in the range of 0.1 to 2 mg/L.

In the mixing step, pH adjustment may be performed if necessary (pH adjustment step). The pH adjuster is an acid such as hydrochloric acid or sulfuric acid, or an alkali such as sodium hydroxide. The pH may be adjusted within the range of 4 to 11, for example.

The treated water quality measuring device 20 is not particularly limited as long as it can measure the water quality of the treated water, and is at least one of turbidity, chromaticity, organic matter concentration, particle size, and particle size distribution. It is preferable that it is a device that measures at least one of the particle size and the particle size distribution by image analysis.

The liquid temperature in the coagulation separation treatment (mixing step, floc forming step, separation step) is not particularly limited and is, for example, in the range of 15 to 35°C. Since the separability changes depending on the viscosity, it is desirable to adjust the liquid temperature so that it is as constant as possible.

The water to be treated which is a treatment target in the water quality measuring device and the coagulation/separation device is, for example, water containing suspended substances and the like, and examples thereof include river water, industrial water, drainage water and the like.

By the coagulation-separation method and coagulation-separation apparatus or the water quality measurement method and water quality measurement apparatus according to the present embodiment, for example, treated water having a suspended substance concentration of 1 to 10 mg/L is removed at a rate of 90% to 99%. be able to.

In the coagulation/separation method and coagulation/separation apparatus, or the water quality measurement method and water quality measurement apparatus according to the present embodiment, the mixing step, the floc forming step, and the separation step may be performed using curved channels.

In the coagulation-separation method and the coagulation-separation apparatus according to the present embodiment, or the water quality measurement method and the water-quality measurement apparatus, the water to be treated is sampled from the inlet water of the coagulation separation treatment apparatus of the actual machine, and the treated water quality of the coagulation separation apparatus The flocculation conditions of the actual flocculation/separation processing apparatus may be controlled based on the measurement result of 1. For example, the amount of the coagulant added in the actual flocculation/separation treatment device may be controlled based on the quality of the treated water for evaluation measured by the treatment water quality measurement device.

Hereinafter, the present invention will be described in more detail with reference to Examples and Comparative Examples, but the present invention is not limited to the following Examples.

<Example 1 and Comparative Example 1>
The wall flow velocity of the lower inner wall surface of the curved channel is greater than 0 (the lower inner wall surface is a slip surface), and the wall fluid velocity of the remaining inner wall surface is 0 (the remaining inner wall surface is a non-slip surface) An experiment was conducted to confirm In Example 1, the lower inner wall surface was a slip surface and the other three inner wall surfaces were non-slip surfaces in the cross-sectional direction of the rectangular flow path. In Comparative Example 1, all the inner wall surfaces in the cross-sectional direction of the rectangular flow path were non-slip surfaces (wall surface flow velocity was 0). Density of the fluid, 998kg / ^{m 3,} the density of the particles is 1005kg / ^{m 3.} The degree of separation of particles was 0.95 in Example 1 and <0.05 in Comparative Example 1.

In Example 1, it can be seen that since the lower inner wall surface of the flow path of the curved channel is a slip surface, the flow in the central direction is suppressed and the lower outer wall surface easily stays in the outer lower portion. This is considered to improve the separability.

As described above, the solid-liquid separation device of the example was excellent in the separation performance from the fluid of particles having a density close to that of the fluid.

1 solid-liquid separation device, 3 water quality measuring device, 10 bent channel, 12 treated liquid line, 14 outlet line, 16 treated liquid line, 18 line mixer, 20,108 treated water quality measuring device, 22 treated water pipe, 24 admixture Liquid pipe, 26 concentrated water pipe, 28 treated water pipe, 30 coagulant addition pipe, 100 water quality measuring device for evaluation, 102 mixing tank for evaluation, 104 floc forming tank for evaluation, 106 solid-liquid separation device for evaluation, 110 for evaluation Agglomeration separator.

Claims (10)

A solid-liquid separator having a separation means for separating a concentrated liquid containing solid particles and a treatment liquid from a liquid to be treated containing solid particles,
The solid-liquid separation device, wherein the separating means has a flow path including a wall surface having a curvature, and a part of an inner wall surface of the flow path is a slip wall surface. The solid-liquid separation device according to claim 1,
The separation means has a flow path including an upper wall surface, a lower wall surface, and a side wall surface having a curvature, and at least a part of the upper wall surface or the lower wall surface is a slip wall surface. .. The solid-liquid separation device according to claim 1 or 2, wherein
The solid-liquid separation device, wherein the wall surface flow velocity on the slip wall surface is larger than zero. The solid-liquid separation device according to any one of claims 1 to 3,
The solid-liquid separation device is characterized in that the slip wall surface is a water-repellent processed wall surface or a wall surface using a water-repellent material. A solid-liquid separator according to any one of claims 1 to 4,
Treatment liquid quality measuring means for measuring the quality of the treatment liquid,
Equipped with
The water quality measuring device, wherein the treated liquid quality measuring means is means for measuring at least one of turbidity, chromaticity, organic matter concentration, particle size, and particle size distribution. Including a separation step of separating the liquid to be treated containing solid particles into a concentrated liquid containing the solid particles and a treatment liquid,
The solid-liquid separation method is characterized in that the separation step is performed using a flow path including a wall surface having a curvature, and a part of an inner wall surface of the flow path is a slip wall surface. The solid-liquid separation method according to claim 6, wherein
The separation step is performed using a flow path including an upper wall surface, a lower wall surface and a side wall surface having a curvature, and at least a part of the upper wall surface or the lower wall surface is a slip wall surface. Method. The solid-liquid separation method according to claim 6 or 7, wherein
The solid-liquid separation method, wherein the wall surface flow velocity on the slip wall surface is larger than 0. The solid-liquid separation method according to any one of claims 6 to 8,
The solid-liquid separation method, wherein the slip wall surface is a water-repellent finish-treated wall surface or a wall surface using a water-repellent material. A solid-liquid separation method according to any one of claims 6 to 9,
A treated water quality measuring step of measuring the quality of the treated water,
Including,
In the treated water quality measuring step, at least one of turbidity, chromaticity, organic matter concentration, particle size and particle size distribution is measured.