JP6805282B2 - Solid-liquid separator - Google Patents

Description

An embodiment of the present invention is a solid-liquid separation device for separating and removing suspended substances such as metal ions, organic substances, and inorganic salts from raw water in water purification plants, plants such as industrial wastewater, power plants, and the like. Regarding.

Conventionally, in water purification plants, plants such as industrial wastewater, power plants, etc., solid-liquid separators have been used to separate and remove suspended substances such as metal ions, organic substances, and inorganic salts from raw water. There is.

Typical techniques applied to this type of solid-liquid separation device include agglomeration treatment technology and centrifugation technology.

In the solid-liquid separator to which the coagulation treatment technique is applied, a coagulant is added to the raw water to be treated, and two types of stirring and mixing are added. Immediately after adding the flocculant, strong stirring called rapid stirring is added for a short time to mix the coagulant so that it spreads throughout the raw water, and then weak stirring called slow stirring is added for a long time to separate the agglomerates. The agglomerates that settle and separate in the settling tank are removed by contacting and coalescing to coarsen the mixture.

For this reason, in the solid-liquid separation device to which the coagulation treatment technology is applied, the water tank is divided into a mixing pond for rapid stirring, a coagulation tank or floc formation pond for slow sand stirring, and a settling pond for sedimentation separation. Therefore, a corresponding reaction time is required for each agglutination reaction. For this reason, a large installation space is required for each water tank, and the entire device becomes large.

On the other hand, in a solid-liquid separator to which centrifugation technology is applied, after solid matter is flocked, raw water containing flocs is swirled by a centrifuge, and centrifugal force is used to floc the particles having a predetermined particle size or larger. Is separated from the raw water. Since the centrifuge uses a centrifugal force whose acceleration is larger than gravity, it is possible to separate solid solids in a shorter time than when gravity is used, so the capacity of the settling tank is reduced. be able to.

However, in a centrifuge, when a floc with a weak binding force is swirled at high speed, the floc once formed may be split and miniaturized. Therefore, it is necessary to provide a floc forming tank in order to form flocs that are difficult to divide or become finer. Further, in order to form high-density and high-strength flocs, it is necessary to form a flow path with a shelf board in the flocs forming tank so as to promote collision with the wall surface of the flocs.

In this way, the solid-liquid separator to which the centrifugation technology is applied can reduce the capacity of the settling tank, but it is necessary to provide a floc forming tank, so that it is not possible to realize the miniaturization of the entire device. Can not. Moreover, since the structure of the floc forming tank is complicated, it is not easy to manufacture.

Japanese Unexamined Patent Publication No. 2011-83709 International Publication No. 2014/038537 Japanese Unexamined Patent Publication No. 2010-214248 Japanese Unexamined Patent Publication No. 2011-83397 Japanese Unexamined Patent Publication No. 2012-192346

The problem to be solved by the present invention is that by enabling solid-liquid separation without destroying the flock by centrifugal force, it is possible to eliminate the need for a coagulation tank and a settling tank and achieve miniaturization of the entire apparatus. It is to provide a liquid separator.

The solid-liquid separator of the embodiment is a mixing area having a first stirrer that stirs the raw water into which the inorganic flocculant is injected with a first stirring force and forms a cohesive floc from the turbidity contained in the raw water. When, after the raw water is processed by the mixed area, and a solid-liquid separation zone having a plurality of solid-liquid separator arranged in parallel to solid-liquid separation in the recovered water and the floc I by the centrifugal force , A solid-liquid separator housed in a pipe .

It is a block diagram which shows the structural example of the solid-liquid separation apparatus of embodiment. It is a partial cut-out perspective view and side sectional view which shows the structural example of the solid-liquid separation apparatus of embodiment. It is a schematic diagram for demonstrating the drawing direction of an impeller. It is a schematic diagram which shows the process from the injection of an inorganic flocculant into raw water to the growth of agglomerated flocs (1/4). It is a schematic diagram which shows the process from the injection of an inorganic flocculant into raw water to the growth of agglomerated flocs (2/4). It is a schematic diagram which shows the process from the injection of an inorganic flocculant into raw water to the growth of agglomerated flocs (3/4). It is a schematic diagram which shows the process from the injection of an inorganic flocculant into raw water to the growth of agglomerated flocs (4/4). It is sectional drawing which shows the structural example of the solid-liquid separation area. It is an enlarged oblique sectional view which shows a part of a solid-liquid separation area in detail. It is a schematic diagram for demonstrating the mechanism of solid-liquid separation by a cyclone. It is a figure which shows an example of the analysis result of the pressure distribution in the inflow shell, the outflow shell, and the discharge shell.

The solid-liquid separation device of the embodiment will be described below with reference to the drawings.

FIG. 1 is a block diagram showing a configuration example of the solid-liquid separation device of the embodiment.

FIG. 2 is a partially cutaway perspective view and a side sectional view showing a configuration example of the solid-liquid separation device of the embodiment.

The solid-liquid separation device 10 is configured to be housed in a cylindrical pipe 70, and has a water supply area 12, a pH adjustment area 14, and a mixture arranged in series after an inlet portion 11 for receiving raw water a. An area 16, an agglomeration area 18, a granulation area 20, and a solid-liquid separation area 22 are provided in this order. Further, a recovery pipe 26, a blow pipe 28, and an outlet portion 30 are connected to the solid-liquid separation area 22.

In the pipe 70, the rotating shaft 24 is arranged along the longitudinal direction F of the pipe 70 so as to pass through the central axis of the pipe 70, that is, to pass through the center of the circular cross section of the pipe 70.

The water supply area 12, the pH adjustment area 14, the mixing area 16, the agglomeration area 18, and the granulation area 20 are provided with pump blades 13 fixed to the rotating shaft 24 and stirrers 15, 17, 19, and 21, respectively. .. Each of the pump blades 13, the stirrer 15, 17, 19, and 21 is provided with a blade-shaped impeller.

As illustrated in FIG. 3, each of the pump blades 13 and the agitators 15, 17, 19, and 21 impellers extends in a direction of 0 to 5 ° with respect to a plane V orthogonal to the longitudinal direction F of the rotating shaft 24. doing.

One end of the rotating shaft 24 is connected to a motor 25 provided outside the pipe 70, and when the motor 25 rotates, the rotating shaft 24 also rotates, and the pump blade 13, the stirrer 15, 17, 19, 21 The impeller also rotates in the pipe 70.

As a result, the raw water a received from the inlet portion 11 is fed so as to spirally flow in the pipe 70 from the upstream side to the downstream side by the rotation of the impeller as shown by the arrow in FIG. 2, and the water supply area. 12, pH adjustment area 14, mixing area 16, agglomeration area 18, granulation area 20, and solid-liquid separation area 22 are continuously moved in this order. As described above, the water supply area 12, the pH adjustment area 14, the mixing area 16, the agglomeration area 18, the granulation area 20, and the solid-liquid separation area 22 form a line mixer structure.

Finally, in the solid-liquid separation area 22, the turbid aggregates contained in the raw water a are separated from the raw water a as aggregated flocs, and the sludge b containing the aggregated flocs is discharged from the recovery pipe 26. The raw water a from which the agglomerates have been separated is recovered as the recovered water c from the outlet portion 30.

Next, the details of the water supply area 12, the pH adjustment area 14, the mixing area 16, the agglomeration area 18, the granulation area 20, and the solid-liquid separation area 22 will be described.

The water supply area 12 is also referred to as a pressurized area, and the raw water a received from the inlet portion 11 is pressurized by the pump blade 13 and sent to the pH adjustment area 14.

A pump for pressurizing the raw water a and sending the liquid to the inlet portion 11 may be appropriately provided in the pipe on the upstream side of the solid-liquid separation device 10. In this case, the existing equipment can be diverted.

Further, the water supply area 12 can be omitted by setting the angle of the impeller of the stirrer 17 to the shape and angle at which the raw water a can be fed and pressurized.

The water supply area 12 provided with the pump blades 13 is provided between the pH adjustment area 14 and the mixing area 16 instead of being provided on the upstream side of the pH adjustment area 14 as illustrated in FIGS. 1 and 2. May be prepared for. Alternatively, it may be provided both on the upstream side of the pH adjustment area 14 and between the pH adjustment area 14 and the mixing area 16.

A pH adjuster injection tube 14a connected to a pH adjuster injection machine (not shown) is connected to the pH adjustment area 14, and in the pH adjustment area 14, the raw water a supplied from the water supply area 12 is connected. The pH adjuster d supplied from the pH adjuster injection machine via the pH adjuster injection tube 14a is injected.

The specific pH adjuster is appropriately determined according to the type of the inorganic flocculant injected in the mixing area 16, as will be described later.

The stirrer 15 stirs the raw water a into which the pH adjuster d is injected and sends the liquid to the mixing area 16.

An inorganic coagulant injection pipe 16a connected to an inorganic coagulant injection machine (not shown) is connected to the mixing area 16, and in the mixing area 16, the raw water a supplied from the pH adjustment area 14, that is, pH. The inorganic flocculant e supplied from the inorganic flocculant injection machine via the inorganic flocculant injection pipe 16a is injected into the raw water a mixed with the regulator d.

Examples of the inorganic flocculant e include, but are not limited to, a sulfuric acid band, polyaluminum chloride, ferrous sulfate, ferric chloride and the like. Sulfate bands and polyaluminum chloride are used in the acidic region, ferrous sulfate is used in the alkaline region, and ferric chloride is used in both the acidic and alkaline regions.

The pH adjuster d injected in the pH adjusting area 14 is appropriately determined according to the type of the inorganic flocculant e injected in the mixing area 16. For example, in the mixing area 16, when an inorganic flocculant e used in an acidic region such as a sulfuric acid band and polyaluminum chloride is added, in the pH adjustment area 14, for example, hydrochloric acid, sulfuric acid, and carbonic acid adjust the pH. Infused as an agent. Further, when the inorganic flocculant e used in the alkaline region such as ferrous sulfate is added in the mixing area 16, caustic soda, baking soda or the like is injected as the pH adjusting agent in the pH adjusting area 14. To.

4 to 7 are schematic views showing a process from the injection of the inorganic flocculant e into the raw water a to the growth of the aggregated flocs.

Immediately after the inorganic flocculant e is injected into the raw water a in the mixing area 16, the turbid substance h contained in the raw water a has not yet been aggregated by the inorganic flocculant e, as shown in FIG.

In the mixing area 16, the surface potential of the solid substance h in the raw water a is neutralized by the inorganic flocculant e, and the turbid substances h that are easily aggregated collide with each other due to the strong stirring force of the stirrer 17. As a result, the agglomerate i is formed as shown in FIG. 5, and then the surface of the agglomerate i is sphericalized as shown in FIG. 6, and further, as shown in FIG. 7, the particles of the agglomerate i are formed. By making the diameter distribution uniform, it is possible to obtain fine aggregated flocs j having a minimum size, a narrow particle size distribution, high density and high strength.

Here, the stirring force of the stirrer 17 will be described.

The stirring force is represented as G in the following equation (1).

G = (P / (V · μ)) 1/2 ... (1)
Here, P is the energy (W) input to the stirrer 17, V is the capacity of the mixing area 16 (m ³ ), and μ is the viscosity coefficient of water (kg / m · s).

The stirrer 17 stirs the raw water a into which the inorganic flocculant e is injected, for example, with a stirring force in which G is 7,000 or more and 25,000 or less. In order to realize this stirring force, the stirrer 17 rotates, for example, an impeller at a rotation speed of 1000 or more and 15000 (rpm). As a result, the raw water a into which the inorganic flocculant e is injected is generally stirred for 0.1 to 1 second with a stirring force G in the range of 7,000 or more and 25,000 or less while passing through the mixing area 16.

The stirring force of the other stirrers 15, 19 and 21 is smaller than the stirring force of the stirrer 17. Therefore, all of the stirrers 15, 19 and 21 are provided with an impeller that is smaller or has a smaller number of blades than the stirrer 17.

The energy P (W) input to the stirrer 17 can be confirmed by a wattmeter or the like of a motor that rotates the impeller of the stirrer 17. Further, in general, the flow velocity of the fluid flowing in the pipe 70 is designed to be a maximum of 2 (m / s), and when the raw water a flows at this maximum flow velocity, the length is required to stir for 0.1 to 1 second. It is necessary to secure an mixing area 16 having a length of 0.2 (m) to 2 (m) in the direction F.

As described above, when the mixture is stirred for 0.1 to 1 second with a stirring force G in the range of 7,000 or more and 25,000 or less, a high-density agglomerate i having a strong bonding force and a specific gravity of 1.1 to 1.5 is generated. .. Further, by making the surface of the agglomerate i spherical and narrowing the particle size distribution, fine agglomerated flocs j are formed from the agglomerate i. The raw water a containing the aggregated floc j thus formed is sent to the aggregated area 18 by the stirrer 17.

A cationic polymer flocculant injection tube 18a connected to a cationic polymer flocculant injection machine (not shown) is connected to the agglomeration area 18, and in the agglomeration area 18, the coagulation liquid sent from the mixing area 16 is aggregated. The cationic polymer flocculant f supplied from the cationic polymer flocculant injection machine via the cationic polymer flocculant injection tube 18a is injected into the raw water a containing the floc j. Further, the raw water a containing the agglomerated floc j into which the cationic polymer flocculant f is injected is stirred by the stirrer 19 with a stirring force smaller than that of the stirrer 17. As a result, the aggregated floc j grows significantly. In this way, the raw water a containing the aggregated floc j that has grown significantly is sent to the granulation area 20 by the stirring force of the stirrer 19.

An anionic polymer flocculant injection tube 20a connected to an anionic polymer flocculant injection machine (not shown) is connected to the granulation area 20, and in the granulation area 20, liquid is sent from the coagulation area 18. The anionic polymer flocculant g supplied from the anionic polymer flocculant injection machine via the anionic polymer flocculant injection tube 20a is injected into the raw water a containing the greatly grown aggregated floc j. .. Further, the stirrer 21 stirs the raw water a containing the greatly grown agglomerated floc j into which the anionic polymer flocculant g is injected with a stirring force smaller than that of the stirrer 17. As a result, the aggregated floc j grows larger and granulates. The raw water a containing the aggregated floc j granulated in this way is sent to the solid-liquid separation area 22 by the stirring force of the stirrer 21.

FIG. 8 is an oblique cross-sectional view showing a configuration example of the solid-liquid separation area.

FIG. 9 is an enlarged oblique sectional view showing a part of the solid-liquid separation area in detail.

The solid-liquid separation area 22 separates the aggregated flocs j from the raw water a containing the granulated aggregated flocs j by centrifugal force, and separates the aggregated flocs j by recovering the separated raw water a. A plurality of solid-liquid separators 40 are connected in parallel.

Each of the solid-liquid separators 40 includes a cone-shaped cyclone 46 formed by connecting a cylindrical portion 42 and a hollow conical portion 44.

FIG. 10 is a schematic diagram for explaining the mechanism of solid-liquid separation by a cyclone.

The solid-liquid separator 40 is also connected to the cylindrical portion 42, and is an inlet for allowing the raw water a containing the aggregated floc j liquid sent from the granulation area 20 to flow into the cyclone 46 from the tangential direction of the cylindrical portion 42. It is provided with a tube 48. Further, the recovered water c, which is the raw water a connected to the center of the closed surface that closes the cylindrical portion 42 and separated from the aggregated flocs j by the solid-liquid separation action of the cyclone 46, is cyclone in the direction orthogonal to the tangential direction. It is provided with an outlet pipe 50 for discharging from 46. Furthermore, a discharge pipe 52 provided at the tip of the hollow conical portion 44 and for discharging sludge b containing aggregated floc j separated from the raw water a by the solid-liquid separation action of the cyclone 46 from the cyclone 46 is provided. There is.

Note that FIGS. 8 and 9 illustrate a configuration in which five cyclones 46 are arranged in parallel, while FIG. 10 illustrates a configuration in which three cyclones 46 are arranged in parallel. All of these are examples, and the number of cyclones 46 arranged in parallel is not limited.

The inner diameter size of the cylindrical portion 42 is preferably 20 (mm) or more, particularly 30 (mm) for the following reasons.

That is, in the cyclone 46, the smaller the inner diameter of the cylindrical portion 42, that is, the maximum inner diameter of the hollow conical portion 44, the larger the turning force and the better the solid-liquid separation performance. On the other hand, the inner diameters of the inlet pipe 48 and the discharge pipe 52 need to be larger than the size of the aggregated floc j contained in the raw water a sent from the granulation area 20. Since the size of the aggregated flocs j contained in the raw water a sent from the granulation area 20 is several tens (μm) to several (mm), the inner diameters of the inlet pipe 48 and the discharge pipe 52 are larger than the size. Need to be. Therefore, the inner diameter size of the cylindrical portion 42 needs to be at least 20 (mm), and is particularly preferably 30 (mm).

Further, the solid-liquid separation area 22 includes an inflow shell 54 that communicates spatially with all 40 inlet pipes 48 of the plurality of solid-liquid separators, and all outlet pipes 50 of the plurality of solid-liquid separators 40. It includes an outflow shell 56 that communicates in space in common, and a discharge shell 58 that communicates in space in common with all the discharge pipes 52 of the plurality of solid-liquid separators 40.

The inflow shell 54, the outflow shell 56, and the discharge shell 58 are separated by a plurality of cyclones 46. As a result, the pressure in each of the inflow shell 54, the outflow shell 56, and the discharge shell 58 becomes uniform.

FIG. 11 is a diagram showing an example of the analysis result of the pressure distribution in the inflow shell 54, the outflow shell 56, and the discharge shell 58.

From FIG. 11, in the inflow shell 54, the outflow shell 56, and the discharge shell 58, the pressure in each shell becomes uniform, and as a result, the pressure difference between the inlet pipe 48, the outlet pipe 50, and the discharge pipe 52 of each cyclone 46. Is homogenized, and even distribution of raw water in each of the cyclones 46 arranged in parallel (that is, uniform inflow of raw water into each cyclone 46, uniform separation performance) is realized.

The inflow shell 54 is spatially communicated with the upstream side of the solid-liquid separation area 22 at the inflow shell opening 55, that is, is spatially communicated with the granulation area 20. The outflow shell 56 is spatially communicated with the downstream side of the solid-liquid separation area 22 at the outflow shell opening 57.

The discharge shell 58 has a body shape, and a plurality of cyclones 46 are arranged with the discharge pipe 52 facing the discharge shell 58 side so as to orbit around the body by 360 °.

In the vicinity of the downstream end of the discharge shell 58, there is a region 58a that is not circulated by the cyclone 46. A recovery pipe 26 for collecting sludge b of aggregated floc j discharged from the discharge pipe 52 is connected to this region 58a so as to extend in the direction of gravity.

A blow pipe 28 is further connected to the discharge shell 58. The blow pipe 28 is a pipe for returning the supernatant liquid of the raw water a discharged from the discharge pipe 52 together with the aggregated floc j to the inlet portion 11 as blow water.

In this way, by returning the blow water from the discharge shell 58 to the inlet portion 11 by the blow pipe 28, the blow water can be sucked without a pump and the recovery rate of the turbidity from the raw water a can be improved. it can.

For example, by providing a valve (not shown) in the blow pipe 28, the amount of blow water returned to the inlet portion 11 is a predetermined ratio (for example, 5 to 20) to the amount of raw water a flowing into the cyclone 46. %) Can be adjusted.

According to the solid-liquid separation device 10 having the above configuration, the turbidity contained in the raw water a is grown into large aggregated flocs j, and centrifugation is applied to the raw water a containing the large aggregated flocs j. As a result, the aggregated flocs j can be separated from the raw water a, and the raw water a from which the aggregated flocs j have been separated can be recovered.

The large agglomerated floc j contained in the raw water a has a strong binding force and a high density, so that it is not destroyed by the centrifugal force even if it is centrifuged. Therefore, in the solid-liquid separation device 10 of the embodiment, the coagulation tank and the settling tank are unnecessary. As a result, the area required for the installation of the coagulation tank and the settling tank can be reduced, so that the size of the entire device can be reduced.

(Modification example)
Although an example of the solid-liquid separation device of the embodiment has been described above, the solid-liquid separation device of the embodiment can be modified and applied as follows.

That is, in the above embodiment, in the solid-liquid separation area 22, the aggregated flocs j contained in the raw water a are separated from the raw water a, and the raw water a from which the aggregated flocs j are separated is recovered. The separation area 22 can not only separate the aggregated flocs j contained in the raw water a, but also various impurities contained in the raw water a.

For example, the solid-liquid separation area 22 is subjected to pretreatment of a sand filtration device, removal of dirt (suspended substances) contained in groundwater, well water, etc., removal of dust and dirt in circulating water such as a cooling tower, mud contained in sewage, etc. It can also be applied to remove sand, pollen, slime, rust, volcanic ash, etc., industrial cooling water, and dirt (suspended substances) in carp farms.

In this case, the addition of the coagulant and the strong stirring by the stirrer 17 are not required. Therefore, from the solid-liquid separation device 10 of the above embodiment, the pH adjustment area 14, the mixing area 16, the coagulation area 18, and the granulation area 20 This can be realized by a solid-liquid separator having a configuration in which

(Production method)
Next, a suitable manufacturing method of the solid-liquid separation device 10 of the above-described embodiment and modified example will be described.

As described above, in the solid-liquid separation device 10, a large number of cyclones 46 are arranged in the solid-liquid separation area 22. It is advantageous to use a 3D printer to manufacture such a large number of identical devices.

Therefore, the solid-liquid separation device 10 of the above-described embodiment and modified example can be manufactured by integral modeling with a 3D printer, so that the manufacturing cost and the installation construction cost can be reduced.

As a specific raw material, it is possible to use a lightweight and high-strength engineering plastic. Further, in particular, when the solid-liquid separator 10 used under severe conditions such as treating corrosive wastewater at high pressure and high temperature is manufactured, SUS316L or SUS304 powder may be used as a raw material.

Although some embodiments of the present invention have been described, these embodiments are presented as examples and are not intended to limit the scope of the invention. These embodiments can be implemented in various other forms, and various omissions, replacements, and changes can be made without departing from the gist of the invention. These embodiments and modifications thereof are included in the scope and gist of the invention, as well as in the scope of the invention described in the claims and the equivalent scope thereof.

10 ... Solid-liquid separator, 11 ... Inlet, 12 ... Water supply area, 13 ... Pump blade, 14 ... pH adjustment area, 14a ... pH adjuster injection pipe, 15 ... Stirrer, 16 ...・ Mixing area, 16a ・ ・ Inorganic coagulant injection pipe, 17 ・ ・ Stirrer, 18 ・ ・ Coagulation area, 18a ・ ・ Cationic polymer coagulant injection pipe, 19 ・ ・ Stirrer, 20 ・ ・ Granulation area , 20a ... anionic polymer flocculant injection pipe, 21 ... stirrer, 22 ... solid-liquid separation area, 24 ... rotating shaft, 25 ... motor, 26 ... recovery pipe, 28 ... blow piping, 30 ... outlet part, 40 ... solid-liquid separator, 42 ... cylindrical part, 44 ... hollow conical part, 46 ... cyclone, 48 ... inlet pipe, 50 ... outlet pipe, 52 ... discharge pipe, 54 ... Inflow shell, 55 ... Inflow shell opening, 56 ... Outflow shell, 57 ... Outflow shell opening, 58 ... Discharge shell, 70 ... Piping.

Claims (16)

A mixing area having a first stirrer that stirs the raw water into which the inorganic flocculant is injected with a first stirring force to form agglomerated flocs from the turbidity contained in the raw water.
After the raw water is processed by the mixing area, a solid-liquid separation zone having a plurality of solid-liquid separator arranged in parallel to solid-liquid separation in the recovered water and the floc I by the centrifugal force,
A solid-liquid separator that is housed in the piping . The first stirring force is P for the energy (W) input to the first stirring machine, V for the capacity (m ³ ) of the mixing area, and μ for the viscosity coefficient (kg / m · s) of water. In the case of, the value of the stirring force G represented by the following equation (1) is in the range of 7,000 or more and 25,000 or less.
G = (P / (V · μ)) 1/2 ... (1)
The solid-liquid separation device according to claim 1 , wherein the first stirrer stirs the raw water while the raw water passes through the mixing area . The solid according to claim 2, wherein the first agitator includes a blade-shaped impeller, and realizes the first agitation force by rotating the impeller at a rotation speed of 1000 or more and 15,000 (rpm). Liquid separator. The solid-liquid separation device according to claim 3, wherein the first stirrer pressurizes and sends the raw water to the downstream side by rotation of the impeller . A mixing area having a first stirrer that stirs the raw water into which the inorganic flocculant is injected with a first stirring force to form agglomerated flocs from the turbidity contained in the raw water.
In order to form a second aggregated floc in which the aggregated floc is greatly grown, a cationic polymer flocculant is injected into the raw water containing the aggregated floc, and the mixture is stirred with a stirring force smaller than the first stirring force. A cohesive area with a second stirrer and
In order to form a third aggregated floc in which the second aggregated floc is greatly grown, an anionic polymer flocculant is injected into the raw water containing the second aggregated floc, and the stirring force is higher than that of the first stirring force. A granulation area with a third stirrer that stirs with a small stirring force,
A solid-liquid separation area having a plurality of solid-liquid separators arranged in parallel for solid-liquid separation from the raw water containing the third aggregated floc into the third aggregated floc and the recovered water by centrifugal force.
A solid-liquid separator that is housed in the piping . According to claim 5, the directions of the impellers provided in the second stirrer and the third stirrer each have an angle of 0 to 5 ° with respect to a plane orthogonal to the longitudinal direction of the pipe. The solid-liquid separator described. The solid-liquid separation apparatus according to claim 5 , further comprising a pH adjusting area for injecting a pH adjusting agent into the raw water sent to the mixing area . The seventh aspect of claim 7, further comprising a pressurizing area having a vane-shaped impeller that pressurizes the raw water delivered to the pH adjusting area or the raw water containing the pH adjusting agent delivered to the mixing area. Solid-liquid separator. The solid according to claim 7 , wherein the raw water forms a line mixer structure spirally flowing in the pipe by the pH adjusting area, the mixing area, the agglomeration area, and the granulation area. Liquid separator. The pH adjusting area is provided with a fourth stirrer for stirring the raw water injected with the pH adjusting agent.
Said second stirrer, the third agitator, and neither the fourth agitator comprising a first agitator small or blades having a small number of blades shaped impeller than, claim 7 The solid-liquid separator described in. The solid-liquid separator according to claim 10 , wherein each impeller provided in the fourth stirrer has an angle of 0 to 5 ° with respect to a plane orthogonal to the longitudinal direction of the pipe. .. Each of the plurality of solid-liquid separators
A cone-shaped cyclone formed by connecting a cylindrical part and a hollow conical part,
An inlet pipe connected to the cylindrical portion and for allowing the raw water to flow into the cyclone from the tangential direction of the cylindrical portion.
A discharge pipe provided at the tip of the hollow conical portion and for discharging the aggregated flocs separated from the raw water by the solid-liquid separation action of the cyclone from the cyclone.
An outlet for discharging the raw water from the cyclone in a direction orthogonal to the tangential direction, which is connected to the center of the closed surface that closes the cylindrical portion and separated from the aggregated flocs by the solid-liquid separation action of the cyclone. Equipped with a tube,
The solid-liquid separation area is
An inflow shell that communicates with all the inlet pipes of the plurality of solid-liquid separators,
An outflow shell that communicates with all the outlet pipes of the plurality of solid-liquid separators,
The solid-liquid separator according to claim 1 , further comprising a discharge shell that communicates with all the discharge pipes of the plurality of solid-liquid separators in common . The solid-liquid separation device according to claim 12 , wherein the inner diameter size of the cylindrical portion is 20 (mm) or more . A recovery pipe connected to the discharge shell so as to extend in the direction of gravity and for collecting the aggregated flocs discharged from the discharge pipe,
Further provided with a blow pipe connected to the discharge shell and for discharging the supernatant liquid of the raw water discharged with the aggregated flocs from the discharge pipe.
The inlet shell, through upstream and space communication of the solid-liquid separation zone, the outlet shell, the in fluid downstream and spatial communication with the solid-liquid separation zone, the solid-liquid separation device described in請Motomeko 12 .. Further provided with an inlet for receiving the raw water to be treated,
The solid-liquid separation device according to claim 14, wherein the blow pipe is connected to the inlet portion in order to supply the supernatant liquid to the inlet portion. It is integrally shaped by 3D printer, solid-liquid separation device according to claim 1.