JP3676657B2 - Swirl type agglomeration separator - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a coagulation separation technique such as a water treatment process and a chemical process used for formation of coagulation floc such as coagulation sedimentation treatment and separation of coagulation floc (solid) and a separation liquid (liquid).
[0002]
[Prior art]
Conventional coagulation sedimentation equipment mixes a flocculant with the water to be treated, which is the raw water, and stirs this mixture to agglomerate to form and grow a floc group (aggregation floc). And a clear separation liquid (treated water) is obtained, and is mainly composed of (1) a chemical mixing tank, (2) a flock formation tank, and (3) a sedimentation separation tank.
[0003]
[Problems to be solved by the invention]
However, the coagulation sedimentation apparatus having such a configuration is a complicated process, and in addition, a large site area is required for each tank. In particular, the sedimentation tank requires a long residence time in order to sufficiently separate and separate the aggregated floc, and there is a problem that a large sedimentation basin must be provided. In addition, since each tank is provided with many incidental facilities, there is a problem that not only the construction cost is high, but also operation management becomes complicated. Furthermore, when the amount of inflow water increases, a coagulation floc (pin floc etc.) flows out in a sedimentation basin, so that there is a problem that a stable treated water quality cannot be obtained.
[0004]
The present invention has been made to solve the above-described problems, and does not require a separate and large settling separation tank that can take a long residence time. An object of the present invention is to provide an inexpensive and space-saving coagulation / separation apparatus that can reliably separate formed and grown coagulation flocs and can cope with fluctuations in the amount of inflow water.
[0005]
[Means for Solving the Problems]
A swirling flow type agglomeration separation device according to the present invention, Raw water Introduce a mixture containing flocculating agent and coagulant In a swirling flow type coagulation separation device Japanese liquid introduction means and A swirling flow that circulates in the horizontal direction is formed. Lower coagulation with swirl flow forming means for stirring and mixing admixture And An upper separation zone that communicates with the lower agglomeration zone and has separated water outlet means for leading the separated water separated from the mixture; , It has a plurality of through holes and is provided between the lower agglomeration zone and the upper separation zone. Impedes the flow in the lower agglomeration zone Porous part Material, Provided at the bottom of the porous member and / or the bottom of the lower agglomeration zone , Swirling flow that circulates horizontally Vertical flow One or more guide plates to convert to It is characterized by comprising.
[0006]
In the swirling flow type aggregating and separating apparatus according to the present invention, the swirling flow forming means is a radial flow type stirring blade having one or more stirring blades for forming a swirling flow that circulates in the horizontal direction in the lower agglomeration zone. It is characterized by this.
[0008]
DETAILED DESCRIPTION OF THE INVENTION
An embodiment of the present invention will be described below.
Embodiment 1 FIG.
1 is a cross-sectional view showing a configuration of a swirling flow type coagulation separation apparatus according to Embodiment 1 of the present invention, FIG. 2 is a plan view of FIG. 1, and FIG. 3 is a perspective view of FIGS. . In the figure, reference numeral 1 denotes a swirling flow type coagulation / separation apparatus (hereinafter simply referred to as coagulation / separation apparatus). The aggregating / separating apparatus 1 is connected to the aggregating / separating tank 2 with a bottomed substantially cylindrical aggregating / separating tank 2 and supplies a mixture of raw water, an aggregating agent, an agglomerating aid and the like into the aggregating / separating tank 2. And a mixing tank 3 for the purpose.
[0009]
The agglomeration separation tank 2 is provided with a porous member 4 that divides the inside of the agglomeration separation tank 2 into an upper separation area 2a and a lower aggregation area 2b. In the lower agglomeration zone 2 b, a stirring blade (swirl flow forming means) 5 that hangs down from the upper part of the agglomeration separation tank 2 and mainly forms a swirl flow A in the horizontal direction, and stands at the center of the lower surface of the porous member 4. A guide plate (vertical flow forming means) 6 for converting the swirling flow A generated by the stirring blade 5 into a downward flow (downward vertical flow) B, and a sedimentary substance such as agglomerated sludge (agglomerated floc) are disposed outside the apparatus. A sludge take-out section 7 for discharging is provided. Here, the above-described swirling flow A is a flow formed in the lower agglomeration zone 2b by the rotation of the stirring blade 5 and mainly flows in the horizontal direction in the lower agglomeration zone 2b. In the upper separation area 2a, a treated water extraction part (separated water deriving means) 8 for discharging the clear separated water that has passed through the porous member 4 and separated the floc flocs as a treated water is discharged, and in the separated water A sedimentation accelerating member 9 that promotes the sedimentation of the remaining fine floc (pin floc) is provided.
[0010]
The horizontal cross section of the flocculation separation tank 2 has a swirl flow A that circulates mainly in the horizontal direction by the rotation of the stirring blade 5 in the lower flocculation zone 2b. Although it is circular so that it can be easily formed and maintained, there is no particular limitation as long as it has a point-symmetric horizontal cross section such as a regular octagon or a regular hexagon.
[0011]
The mixing tank 3 is connected to the vicinity of the bottom of the coagulation / separation tank 2 (lower coagulation zone 2b) via an admixture introducing section 3a. In mixing tank 3, the raw material water and A stirring blade 10 for rapidly stirring and mixing the flocculant is provided in a suspended state. In the first embodiment, the mixing tank 3 is connected adjacent to the flocculation / separation tank 2. However, the mixing tank 3 is omitted and a flocculant is added to the raw water pipe directly connected to the lower flocculation zone 2 b, so A mixed solution may be prepared by (line mixing). Further, as shown in FIG. 2, the admixture introducing portion 3a communicates so as to introduce the admixture horizontally from the wall portion of the substantially cylindrical agglomeration separation tank 2 along the inner wall surface of the lower agglomeration zone 2b. This is because the mixed liquid to be introduced forms a swirl flow A in the lower agglomeration zone 2b (swirl flow forming means), and when used in combination with the stirring blade 5, the efficiency of forming and maintaining the swirl flow is further increased. It is intended to improve.
[0012]
Here, examples of the coagulation aid used for coagulation separation include synthetic polymer flocculants, natural polymer flocculants, inorganic compounds, inorganic minerals such as sand, metals, and the like, which are appropriately selected. Yes, it is not limited to these. As a method of adding the coagulation aid to the raw water, a method of quickly and uniformly dispersing is adopted, for example, a method of adding the coagulation aid itself to the raw water in a slurry or solution state, and the particulate coagulation aid in a dry state. Examples of the method include adding to raw water. Also, if the addition method is distinguished by the addition position in the mixing tank 3 or the lower coagulation zone 2b, the method of adding an agglomeration aid in the vicinity of the inlet to the mixing tank 3 or the like, and uniformly dispersing in the mixing tank 3 or the like The method of adding the coagulant aid, the method of adding the coagulant aid to a portion having a high flow rate such as in the mixing tank 3, the method of adding the coagulant aid stepwise for each residence time, and the like can be appropriately selected. The raw water introduced into the mixing tank 3 may be added with a coagulant and a pH adjuster in addition to the coagulant by performing line injection or line mixing in the introduction process.
[0013]
The porous member 4 has a plurality of through holes that do not obstruct the passage of the separated water separated by the admixture or the aggregated flocs, and separates both areas so that the flow of the lower aggregated area 2b does not substantially reach the upper separated area 2a. It is a flat plate. As the porous member 4, for example, a wire mesh, a punching plate, an expanded metal, a special porous plate, a thin plate shape or a granular packed layer can be used. Further, the porous member 4 is horizontally installed so as to divide the agglomeration separation tank 2 vertically between the lower agglomeration zone 2b where the stirring blades 5 are located and the upper separation zone 2a where the treated water outlet 8 is located. . In addition, in order to prevent the upward flow from being formed when the swirling flow A is converted into the downward flow in the portion of the porous member 4 where the guide plate 6 is erected, the portion near the inner wall In order to prevent the upward flow rising along the inner wall, it is desirable to provide a non-hole portion not provided with the through hole or to provide the water stop member 11 as shown in FIGS.
[0014]
In general, the stirring blade is provided with a single stirring blade or a plurality of stirring blades, and the stirring blade 5 is fixed to one shaft and has driving means (not shown) is a stirrer (stirring device). A plurality of stirring blades may be provided on one shaft (multistage type). The shape of the stirring blade 5 in the first embodiment is a radial flow type that mainly forms a swirling flow A in the horizontal direction in the lower agglomeration zone 2b as shown in FIG. This radial flow type agitating blade generally has a shape in which a flat stirring blade rotates to discharge a water flow radially in the horizontal direction and mainly circulate in the horizontal direction. As shown in FIG. 2, the stirring blade 5 has four blades arranged radially on the rotating shaft, but the number of blades may be at least one, and the number of the blades is not limited. Further, the number of blades of the stirring blade 5 is not limited. The setting position of the stirring blade 5 provided in the lower coagulation zone 2b is between the porous member 4 and the bottom of the coagulation separation tank 2, and depends on the internal shape of the coagulation separation tank 2, the installation position of the guide plate 6, and the like. It is set as appropriate from among the upper part, middle part and lower part. The rotational speed of the stirring blade 5 is moderate so that the aggregated floc formed in consideration of the physical properties of the aggregated floc formed in the liquid mixture by the control of the driving device (not shown) is not destroyed by stirring. Can be appropriately changed within a range sufficient to form a horizontal swirling flow A that gives a horizontal inertia force necessary for the separation of the two. As the shape of the stirring blade 5, blades of all shapes can be used, but in order to efficiently generate a swirling flow, a horizontal flow of a known paddle type, special paddle type, standard ruston type, turbine type or the like can be discharged. It is better to use a radiant flow type. In order to obtain an ideal stirring state in the lower agglomeration zone 2b by the agitation blade 5, assuming that the inner diameter of the lower agglomeration zone 2b is L and the diameter of the agitation blade 5 is D, the ratio D / L = 0.3 to Both dimensions are set so as to satisfy the range of 0.7. If the stirring blade 5 cannot be installed due to the shape of the flocculation / separation tank 2 or the like, a jet apparatus (circulator or the like) that can create a horizontal flow in the lower flocculation zone 2b may be installed. . Furthermore, if the above-mentioned mixed liquid is introduced in the horizontal direction along the inner wall surface of the lower agglomeration zone 2b, a sufficient swirl flow can be formed in the lower agglomeration zone 2b. Therefore, no other devices are required. In short, it is only necessary to form a swirling flow that circulates in the horizontal direction in the lower agglomeration zone 2b and to apply a horizontal inertial force to the agglomeration flock. Note that various swirl flow forming means may be used in combination as required.
[0015]
The guide plate 6 is installed in a suspended state on the lower surface of the porous member 4 as shown in FIG. 1, and four plates are radially fixed around the center of the porous member 4 as shown in FIG. A part of the swirl flow A that collides with this is converted into a vertical flow B in the downward direction. Incidentally, the guide plate 6 converts a part of the swirl flow A into the vertical flow B in the upward direction when standing on the bottom of the lower aggregation region 2b as described later in the second embodiment. . The guide plate 6 is a square or rectangular flat plate, but may have a curved shape. The number of guide plates 6 may be at least one, and the number is not limited.
[0016]
As the treated water outlet 8, a water collection facility for collecting water with uniform flow in the upper separation zone 2 a of the coagulation separation tank 2 can be used. The sedimentation promoting member 9 is not an essential element for the coagulation / separation apparatus 1 but is provided as necessary. When the sedimentation promoting member 9 is provided, a parallel plate in which a plurality of parallel plates are combined with a predetermined separation distance, an inclined plate such as a corrugated plate in which a plurality of corrugated plates are combined with a predetermined separation distance, and a plurality of circular tubes A settling tube combined with a square tube, a support material or a packed bed with a short tube or granular carrier in the frame to increase the separation area and increase the separation effect, a rectifying material such as a perforated plate, baffle plate or screen Although it can be used, it is not particularly limited as long as it promotes sedimentation of sedimentary substances such as pin floc remaining in the separated water rising in the upper separation zone 2a. The inclined plate and the settling tube may be installed as they are in the upper separation zone 2a, or may be installed by being supported by a support material.
[0017]
The agglomeration and separation in the agglomeration separation tank 2 having such a configuration will be described.
First, in order to omit a sedimentation separation tank that requires a large site area in a conventional coagulation sedimentation treatment apparatus, a mixed liquid in which raw water and a coagulant are mixed is stirred to form a floc, and the formed flocculant floc is It is necessary to obtain clear separated water by separation by a technique. The flow in the floc forming tank in the coagulation sedimentation treatment apparatus is as follows: (1) Stirring discharge flow rate (Q _d ), (2) Stirring discharge flow rate Q _d Accompanying flow (Q _b ) And (3) Raw water flow rate (Q ₀ ) Is the basis. Here, the amount Q related to stirring _d + Q _b = Q _c If this is the case, this is the circulation flow rate of the tank (Q _c ) Therefore, the sum of the flow in the floc forming tank is Q _c + Q ₀ The index that represents the average liquid flow rate in the tank is (Q _c + Q ₀ ) / A _f = V _a It becomes. Where A _f Is the horizontal cross-sectional area of the floc forming tank. That is, this flow (average flow velocity V _a ), An optimal aggregated floc is formed.
[0018]
On the other hand, in order to efficiently separate the formed floc group, this V _a It is effective to make as small as possible. But where Q ₀ Is the inflow of raw water, A _f Since are the cross-sectional areas of the floc forming tank, they are constants. Therefore, V _a Is Q _c The closer it is to 0 (zero), the smaller it is. Therefore, in the above flock formation tank, Q _c To get closer to 0, Q _c What is necessary is just to form the discontinuous surface which obstructs the flow of water. Therefore, in the present invention, although water passes, the agglomeration separation tank 2 is divided into a lower agglomeration zone 2b and an upper separation zone 2a using a porous member 4 that inhibits flow.
[0019]
Now, where Q _c Is approximately 0, the average liquid flow velocity in the floc forming tank (ie, the average ascending velocity) is V _a = Q ₀ / A _f = V _L It becomes. Therefore, the rising speed V _L Flocks with smaller settling rates will overflow with the treated water. However, here, the rising speed V _L Ascending speed V _L If the horizontal swirl A is given at a much faster speed, the ascending speed V _L In addition, even agglomerated floc group having a lower settling velocity moves along the swirl flow A, becomes less likely to accompany the upward flow C due to its inertial force, and receives a downward force by applying a downward flow B. For that purpose, the rising speed V _L Even a floc group having a lower sedimentation speed can be separated. In addition, the above-mentioned general flock formation tank corresponds to a coagulation separation tank in this invention.
[0020]
Next, the operation will be described.
First, raw water containing a sedimentary substance is introduced into the mixing tank 3 at a constant flow rate. In the mixing tank 3, a flocculant is added to the raw water, a pH adjuster is also added as necessary, and the mixture is rapidly mixed by the stirring blade 10. As a result, fine flocs are formed in the raw water. In this case, a coagulation aid such as a sedimentation accelerator such as sand or a polymer coagulant may be added as necessary.
[0021]
The mixed liquid which is the raw water pretreated in the mixing tank 3 as described above is introduced in the horizontal direction along the inner wall surface in the lower agglomeration zone 2b from the mixed liquid introducing section 3a, and the stirring blade 5 is rotated. As a result, a swirl flow A that circulates in the horizontal direction is formed in the lower agglomeration zone 2b. Then, if necessary, a polymer flocculant or the like is added, and the flocs in the mixed liquid are greatly grown by appropriate stirring and mixing in the lower aggregation region 2b. At this time, in the lower agglomeration zone 2b, the admixture containing the agglomeration floc is stirred and mixed. However, in the region in the vicinity of the porous member 4, as shown in FIG. . Therefore, the upper part of the concentration interface F is the stirring discharge flow rate (Q _d ) Is somewhat mitigated. Since the porous member 4 is horizontally disposed above the concentration interface F so as to divide the agglomeration separation tank 2 vertically, in the upper separation region 2a on the upper side of the porous member 4 due to the inhibition action of the porous member 4 As a result, a uniform upward flow C that is hardly affected by the stirring blade 5 is formed. On the other hand, in the lower agglomeration zone 2 b, a swirl flow A that circulates in the horizontal direction along the inner wall surface is formed by the rotation of the radial flow type stirring blade 5, and at the same time, a part of this swirl flow A is caused by the guide plate 6. A downward flow B is formed downward along the rotational axis of the stirring blade 5. This downward flow B gives a downward force to the aggregated floc group that is difficult to accompany the upward flow C due to the inertial force given by the swirl flow A. Agglomerated floc groups to be separated from stream C are efficiently separated.
[0022]
The aggregated floc group thus separated remains in the lower aggregated area 2b and is concentrated to increase the aggregated floc concentration. Therefore, as appropriate, the aggregated floc group directly from the sludge extraction part 7 provided at the bottom of the lower aggregated area 2b or the like. Pull out to the outside. In some cases, the agitation blade 5 may be temporarily stopped before the extraction to precipitate the aggregated floc on the bottom, and the precipitated aggregated sludge having a high concentration may be extracted. In addition, when sand is used as a sedimentation promoting material, sand can be separated from the extracted aggregated sludge, and the sand can be returned to the mixing tank 3 or the lower aggregated area 2b for reuse. Various separation devices can be considered for separating the sand and the coagulated sludge, and a wet cyclone or the like is used as an example.
[0023]
On the other hand, the separation liquid separated from the flocs flocs rides on the upward flow C, passes through the upper separation zone 2a, and overflows from the treated water extraction part 8. At that time, by using the sedimentation promoting member 9 such as an inclined plate provided in the upper separation region 2a, pin flocs accompanying the upward flow C can be settled and removed, and further high-quality treated water can be obtained. it can.
[0024]
As described above, according to the first embodiment, by providing the stirring blade 5 or the like as the swirl flow forming means, the swirl flow A in the horizontal direction having a flow velocity larger than the rising speed is physically (mechanically). An inertial force is applied to the aggregated flocs in the mixed liquid that forms and flows in, thereby preventing the aggregated flocs from rising along with the upward flow C. In addition, the presence of the upward flow C causes the aggregate floc to receive a considerable upward force. However, by providing the guide plate 6 as the vertical flow forming means, a part of the swirling flow A follows the rotational axis. The downward flow B is converted into a downward flow B, and the downward flow B can apply a downward force to the flocculation floc in the mixed liquid, and it can be efficiently performed with a short residence time as compared with the conventional flocculation separation device by gravity precipitation. The mixed solution can be solid-liquid separated into agglomerated floc and separated water. Incidentally, while the residence time in the conventional coagulation sedimentation apparatus was 60 to 120 minutes, in the aggregation separation apparatus according to the first embodiment, the residence time can be greatly reduced to 3 to 6 minutes. It was. In addition, the large sedimentation and separation tank, which was essential in the conventional coagulation sedimentation equipment, can be omitted, so rakes and other mud collectors become unnecessary, maintenance becomes easy, and electricity costs are saved. Can do.
[0025]
In the first embodiment, the aggregated flocs are not subjected to separation by gravity sedimentation, but are separated by actively using inertial force. Therefore, formation of the aggregated flocs having a large sedimentation speed is not essential, and a certain sedimentation speed is obtained. Since it can be separated if it is a floc having, it can save not only a chemical such as a flocculant and a sedimentation accelerator as a coagulant but also a site area and processing time. Furthermore, the guide plate 6 can form a vertical flow (downward flow) B without power, and the stirring blade 5 only needs to be driven to form the swirling flow A. Can be reduced, and a powerful device is not required. This is also effective for energy saving and cost saving.
[0026]
In the first embodiment, by providing the porous member 4, the stirring blade 5 as the swirl flow forming means, and the guide plate 6 as the vertical flow forming means, the ascending speed and the separation efficiency are improved as compared with the conventional coagulating sedimentation apparatus. Since it can be greatly improved, it becomes more compact, the site area can be reduced, and the construction cost can be reduced.
[0027]
In the first embodiment, since the rotation speed of the stirring blade 5 as the swirl flow forming means can be changed, if the rotation speed adapted to the physical properties of the aggregated flocs in the mixed liquid is selected, even in the same apparatus, It can be treated in accordance with fluctuations in liquid properties, inflow water amount, concentration, water quality and the like.
[0028]
In the first embodiment, the inside of the lower agglomeration zone 2b can be gently flowed by the stirring blade 5, so that the agglomeration floc flowing in the lower agglomeration zone 2b can be stably and reliably formed and grown. Can be made.
[0029]
In the first embodiment, the sludge extraction part 7 is provided at the bottom of the lower agglomeration zone 2b. However, if necessary, a sedimentary substance such as agglomerated sludge is precipitated by gravity on the side surface in the lower agglomeration zone 2b. It is also possible to provide a sedimentation sludge take-out section (not shown) for concentrating and discharging the aggregated sludge to the outside of the apparatus. Moreover, you may provide a coagulant auxiliary | assistant injection | pouring means (not shown) in the lower cohesive zone 2b. Examples of the coagulation aid injected from the coagulation aid injection means include polymer coagulants and inorganic materials such as sand, but are not limited thereto. Moreover, in this Embodiment 1, although the bottom part (lower aggregation area 2b) of the aggregation separation tank 2 was made into the flat surface, it is good also as a cone shape.
[0030]
Embodiment 2. FIG.
4 is a cross-sectional view showing a configuration of a coagulation / separation device according to Embodiment 2 of the present invention, FIG. 5 is a plan view of FIG. 4, and FIG. 6 is a perspective view of FIGS. Of the constituent elements of the second embodiment, those common to the constituent elements of the first embodiment are denoted by the same reference numerals, and description thereof is omitted.
[0031]
A feature of the second embodiment is that a guide plate 6 is erected on the bottom of the lower agglomeration zone 2 b, and a stirring blade 5 is disposed between the guide plate 6 and the porous member 4. In the second embodiment, as shown in FIG. 6, a horizontal swirling flow A generated by the stirring blade 5 located above the lower agglomeration zone 2b of the agglomeration separation tank 2 is erected at the bottom of the lower agglomeration zone 2b. The guide plate 6 forms an upward flow B ′ (upward vertical flow) that rises along the rotational axis of the stirring blade 5, but the lower agglomeration near the lower surface of the porous member 4 by the rotation of the stirring blade 5. A downward force is applied to the aggregated floc in the mixed solution by the downward flow B (downward vertical flow) sent out from the area 2b toward the peripheral edge of the porous member 4 along the inner peripheral wall surface of the lower aggregated area 2b. And the efficiency of solid-liquid separation can be improved. In addition, the vicinity of the bottom of the lower agglomeration zone 2b can be sufficiently stirred and mixed in the vertical direction by the upward flow B ', and the sedimentation and accumulation of the agglomerated flocs can be prevented.
[0032]
In addition, when an inorganic material such as sand is used as the sedimentation accelerator, the sand extracted from the sludge take-out section 7 is recovered by a centrifugal separator such as a wet cyclone and again in the mixing tank 3 or the lower agglomeration zone 2b. By supplying, the settling accelerator can be effectively used and saved.
[0033]
As described above, according to the second embodiment, the upward flow B ′ (upward vertical flow) is formed along the rotation axis of the stirring blade 5 by the guide plate 6 erected on the bottom of the coagulation separation tank 2. As a result, a downward flow B (downward vertical flow) can be formed in the vicinity of the peripheral edge of the porous member 4, so that a downward force can be applied to the agglomeration flock, and the conventional agglomeration by gravity precipitation is performed. The mixed liquid can be efficiently solid-liquid separated into agglomerated floc and separated water with a short residence time as compared with the separation device, and sedimentation and deposition on the bottom of the lower agglomeration zone 2b can be prevented.
[0034]
In this Embodiment 2, although the sedimentation promoting member (not shown) in Embodiment 1 is not provided in the upper separation area 2a, it may be provided as necessary. Moreover, in this Embodiment 2, although the sludge extraction part (not shown) is not provided in the lower aggregation area 2b, you may provide as needed. Heretofore, the flocculation / separation process has been described, but the present invention can also be used for solid-liquid separation in the flocculant-added activated sludge process, sludge concentration in the sludge process, and the like.
[0035]
【The invention's effect】
As described above, according to the present invention, by providing the porous member and the swirl flow forming means, the lower agglomeration zone is efficiently stirred with a small stirring power to form a desired swirl flow. By applying an inertial force in the horizontal direction to the flocs, it is possible to prevent the flocs from rising accompanying the upward flow, and by forming a vertical flow forming means, a downward flow is formed from the swirl flow By using this downward flow to apply a downward force to the coagulation floc, solid-liquid separation can be performed efficiently in a shorter residence time compared to solid-liquid separation by gravity precipitation in conventional coagulation sedimentation equipment. Can do. Incidentally, while the residence time in the conventional flocculation / precipitation apparatus is 60 to 120 minutes, in the flocculation / separation apparatus according to the present invention, the residence time can be significantly reduced to 3 to 6 minutes. In addition, since the conventional sedimentation tank with a large site area can be omitted, mud collectors such as rakes can be dispensed with, and other incidental equipment can also be omitted, facilitating maintenance and processing including electricity costs. Cost can be reduced.
[0036]
According to the present invention, the separation is not performed by gravity settling, but actively utilizes the inertial force, so that it is not essential to form an agglomerated floc having a large settling speed, and the floc has a certain settling speed. Since it can be separated if necessary, not only chemicals such as coagulants and sedimentation accelerators, but also site area and processing time can be saved. Furthermore, since a vertical flow can be formed without power by a guide plate as a vertical flow forming means, the agitating blade only needs to be driven to form a swirling flow. Is also unnecessary. This is also effective for energy saving and cost saving.
[0037]
According to the present invention, by providing the porous member and the swirl flow forming means, the ascending speed and separation efficiency can be greatly improved as compared with the conventional coagulation sedimentation apparatus, so that it is more compact and the site area is also increased. It can be made smaller and the construction cost can be reduced.
[0038]
According to this invention, by providing the sedimentation promoting member in the upper separation region of the coagulation separation tank, the pin floc that passes through the porous member and rises can be quickly settled, so that the separation efficiency can be improved. Further, high-quality treated water can be obtained.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a configuration of a coagulation / separation device according to Embodiment 1 of the present invention.
2 is a plan view of FIG. 1. FIG.
FIG. 3 is a perspective view of FIGS. 1 and 2. FIG.
FIG. 4 is a cross-sectional view showing a configuration of a coagulation / separation device according to Embodiment 2 of the present invention.
FIG. 5 is a plan view of FIG. 4;
6 is a perspective view of FIGS. 4 and 5. FIG.
[Explanation of symbols]
1 Coagulation separation device (Swirl flow type coagulation separation device)
2 Coagulation separation tank
2a Upper separation area
2b Lower agglomeration zone
3 Mixing tank
4 Porous members
5 Stirring blade (swirl flow forming means)
6 Guide plate (Vertical flow forming means)
7 Sludge outlet
8 Treated water outlet (separated water outlet)
9 Settling acceleration member
10 Stirring blade
11 Water-stop member or non-porous part
A swirl flow
B, B 'Vertical flow
C Ascending current

Claims (2)

In a swirl type agglomeration separation device that introduces a mixed liquid in which raw water and a flocculant are mixed to agglomerate and separate into solid and liquid,
Deriving a lower aggregation region with a swirling flow forming means for mixing and stirring the swirling flow formed liquid mixture circulating in mixed sum liquid introduction means and the horizontal direction, the separated water separated from communication with the lower aggregation area, and mixture solution an upper separation zone having a separated water outlet means has a plurality of through-holes, is and et provided between the lower flocculation zone and the upper separation zone, and the porous member that inhibits flow of the lower flocculation zone, the porous member A swirling flow type aggregating and separating apparatus provided with one or more guide plates provided on the lower surface and / or the bottom of the lower agglomeration zone and converting a swirling flow that circulates in a horizontal direction into a vertical flow.   2. The swirl flow according to claim 1, wherein the swirl flow forming means is a radial flow type stirring blade having one or more stirring blades for forming a swirl flow that circulates in the horizontal direction in the lower cohesive zone. Type coagulation separator.

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