JPH08318105A - Turbidity removing filter - Google Patents

Abstract

PURPOSE: To save a space, to reduce the frequency of backward washing of a tank filter having a filter bed such as an anthracite bed or a sand bed to shorten the backward washing time and accordingly to prolong water sampling time. CONSTITUTION: A turbidity removing filter 10 is provided with a reaction tank 11 for receiving raw water as water to be treated 16 to which a flocculant has been added and agitating the water to be treated 16 by an agitator 17 to form flocs 22, and a tank filter 13 for receiving the water to be treated 16 from a discharge part of the reaction tank 11 and filtering the flocs 22 in the water to be treated 16 to obtain treated water 28. The reaction tank 11 is divided into an agitation part 20 equipped with an agitator 17 and a non- agitation part 21 separated from the agitator 17 by a partition 19, and also in the upper part and in the lower part of the non-agitation part 21, a discharge part for the water to be treated 16 and a takeoff pipe 24 for taking out huge flocs 22A precipitated to the bottom part of the non-agitation part 21 are installed, respectively.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a turbidity filtration apparatus for treating raw water with a flocculant and then filtering the flocculated material to obtain clear treated water. The present invention relates to a turbidity filtration device that can be extended and save space.

[0002]

2. Description of the Related Art Conventionally, as a device for obtaining clear treated water, a flocculating agent is used to flocculate suspended substances contained in raw water such as river water, well water and lake water as flocs, and the flocculated substances are filtered. Another turbidity filtration device is widely used. This turbidity filtration device has a smaller treatment amount and a relatively smaller amount of suspended solids compared to the case where a full-scale coagulating sedimentation device such as a sludge blanket type or slurry circulation type is combined with a filtration tank. In many cases, it is used as a so-called simple decontamination filter. As such a turbidity filtration device, for example, those shown in FIGS. 4 and 5 are known.

The turbidity filtration apparatus shown in FIG. 4 has a reaction tank 1, a separation tank 2 and a filtration tank 3. A supply pipe 4 for supplying raw water is connected to the reaction tank 1, and a pipe 4A for a coagulant for adding a coagulant to raw water is connected to the supply pipe 4. The supply pipe 4 supplies the water to be treated 5 in which the coagulant is sufficiently mixed with the raw water to the reaction tank 1 on the downstream side of the pipe 4A. The reaction tank 1 is a stirrer 1A.
And a motor 1B connected thereto, and the treated water 5 received from the supply pipe 4 is slowly stirred by the stirrer 1A,
The growth of the flocs 6 in the water to be treated 5 is promoted. In the separation tank 2, a large floc (hereinafter referred to as “giant floc”) 6A grown in the water to be treated 5 received from the reaction tank 1 through the connecting pipe 7A is precipitated and separated, and the growth is not sufficient. Small flock (below,
It is called "micro floc". ) 6B is supplied to the filter tank 3 through the connecting pipe 7B. Also, the separation tank 2
The huge flocs that have settled at the bottom of the separation tank 2 are taken out from the extraction pipe 2A below the separation tank 2. The filtration tank 3 has an anthracite layer 3A and a sand layer 3B as filtration layers, and the fine flocs 6B are filtered from the treated water 5 received from the separation tank 2 by the anthracite layer 3A and the sand layer 3B to obtain a clear treated water. 8
As a result, the water is discharged from the discharge port 3C.

Further, the turbidity filtration device shown in FIG. 5 is constructed in accordance with that shown in FIG. 4 except that the separation tank 2 is omitted. In the case of this turbidity filtration device, compared with the turbidity filtration device shown in FIG. 4, the installation space can be saved by the amount that the separation tank 2 is omitted.

[0005]

However, in the case of the turbidity filtration apparatus shown in FIG. 4, the reaction tank 1 for producing the flocs 6 and the separation tank 2 for separating the flocs 6 into the giant flocs 6A and the minute flocs 6B. And the filtration tanks 3 for filtering out the minute flocs 6B are independently provided,
There is a problem that the installation space for the turbidity filtration device becomes vast.

Further, in the case of the conventional turbidity filtration apparatus shown in FIG. 5, the separation tank 2 is omitted as compared with the apparatus shown in FIG. 4, so the installation space of the separation tank is saved and the space is saved. On the other hand, while the flocs 6 produced in the reaction tank 1 are all filtered out in the filtration tank 3, the anthracite layer 3A and the sand layer 3B are blocked by the flocs 6 in a short time and water is collected. There is a problem that the time is shortened and the number of backwashing of each of the layers 3A and 3B is increased accordingly, which requires a long time for backwashing.

The present invention has been made in order to solve the above-mentioned problems, and can achieve space saving and further reduce the number of times of backwashing of a filtration tank having a filtration layer such as an anthracite layer and a sand layer. It is an object of the present invention to provide a turbidity filtration device that can shorten the washing time and thus the water sampling time.

[0008]

Means for Solving the Problems As a result of various investigations on conventional turbidity filtration devices, the present inventors have made it possible to save space and to perform filtration by providing a specific device for a reaction tank. It was found that the life of the filtration layer composed of an anthracite layer and a sand layer of the tank can be extended.

The present invention has been made on the basis of the above findings. The invention according to claim 1 receives raw water to which a flocculant has been added as water to be treated, and stirs the water to be treated with a stirrer to coagulate. In a turbidity filtration device comprising a reaction tank for producing a substance, and a filtration tank for receiving the treated water from the discharge part of the reaction tank and for filtering aggregated substances in the treated water to obtain treated water, The inside of the reaction tank is divided into a stirrer in which the stirrer is installed by a partition and a non-stirrer separated from the stirrer, the treated water discharge part is provided above the non-stirrer, and the lower part is provided below. It is intended to provide a decontamination filtration device characterized in that each of the non-stirring portions is provided with a take-out pipe for taking out the agglomerated substance precipitated, at the bottom thereof.

The invention according to claim 2 of the present invention is
In the invention according to claim 1, at the position where the partition wall faces the discharge part of the water to be treated, the horizontal cross-sectional area of the non-stirring part formed by the partition wall gradually increases from the bottom to the top. The present invention provides a decontamination filtration device characterized by being provided so as to be inclined.

The invention according to claim 3 of the present invention is
In the invention according to claim 1 or claim 2, there is provided a turbidity filtration device characterized in that a coagulant pipe for supplying the coagulant is connected to a supply pipe for supplying raw water into the reaction tank. To do.

[0012]

According to the first aspect of the present invention, when the raw water to which the flocculant is added and the fine flocs are formed in advance is supplied to the reaction tank as the water to be treated, the agitation section treats the treated water. By slowly stirring the water with a stirrer, minute flocs in the water to be treated grow and generate huge flocs.
Further, the huge flocks and the minute flocs in the stirring section flow into the non-stirring section from the upper end of the partition wall together with the water to be treated. In the non-stirring section, huge flocs gradually settle until the water to be treated that has flowed into the non-stirring section is discharged from the discharge section, and is appropriately taken out of the reaction tank through the take-out pipe, while micro flocs that do not easily settle Is supplied from the discharge part to the filtration tank together with the water to be treated.
Then, in the filtration tank, the fine flocs that have flowed in together with the water to be treated can be filtered out in the filtration layer to obtain clear treated water. During this filtration, the large flocs are precipitated and removed in the non-stirred portion of the reaction tank, so only the fine flocs are filtered out in the filtration layer of the filtration tank, reducing the load on the filtration layer and extending its life. While the water sampling time can be extended, the reaction tank also serves as the separation tank, so that the installation area of the turbidity filtration device can be reduced and the space can be saved.

According to a second aspect of the present invention, in the first aspect of the present invention, the partition wall is formed by the partition wall at a position facing the treated water discharge part. Since the horizontal cross-sectional area of the non-stirred part was inclined so that it gradually increased from bottom to top, it was compared with the case where the partition walls were provided so that the horizontal cross-section area was the same from top to bottom. Therefore, when the volume of the non-stirring portion is the same, the distance between the upper end of the partition wall and the discharge portion can be made longer, so that the giant flocs that overflow the upper end of the partition wall and overflow into the non-stirring portion do not settle. It is possible to effectively prevent a so-called short path that flows out from the discharge part together with the treated water. Further, since the lower part of the non-stirring portion becomes narrow, it is convenient that the flocs settling at the bottom can be easily taken out.

According to the invention of claim 3 of the present invention, in the invention of claim 1 or 2,
Since the coagulant pipe for supplying the coagulant is connected to the supply pipe for supplying the raw water into the reaction tank, the turbulent flow of the raw water flowing through the supply pipe before the raw water is supplied to the reaction tank as the water to be treated. The flocculant is sufficiently agitated in the region, and minute flocs can be generated in the water to be treated before flowing into the reaction tank, so that it is not necessary to separately provide a rapid agitation tank for forming minute flocs.

[0015]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below based on the embodiment shown in FIG. 1 is a flow chart showing an embodiment of the turbidity filtration apparatus of the present invention, FIG. 2 is a plan view schematically showing the operation of the reaction tank of the turbidity filtration apparatus shown in FIG. 1, and FIG. It is the top view which looked at the inside of the filtration tank shown in above from the anthracite layer.

As shown in FIG. 1, the turbidity filtration apparatus 10 of this embodiment comprises a reaction tank 11 and a gravity type filtration tank 13 connected to the reaction tank 11 via a connecting pipe 12. I have it. A supply pipe 14 for supplying raw water to the reaction tank 11 is connected to the lower part of the reaction tank 11. Further, a coagulant pipe 15 is branched and connected to the supply pipe 14, and the coagulant is added into the supply pipe 14 through the coagulant pipe 15 to form treated water 16 from the supply pipe 14 to the reaction tank 11. I am supplying it. In addition, in FIG. 1, the treated water inflow part 4 of the reaction tank 11 is connected from the connection position of the coagulant pipe 15 for injecting the coagulant.
Although the length of the supply pipe until reaching 0 is extremely short in the drawing, this length is set to, for example, about 10 to 50 m, and a pipe is provided between the treated water to which the coagulant is added and the reaction tank 11 Stir well and mix in to form fine flocs. In addition, as described above, the coagulant pipe 15
Instead of increasing the length of the supply pipe after the connection position of,
An in-pipe mixer may be provided in the supply pipe after the connection position of the coagulant pipe 15. As the coagulant, for example, aluminum sulfate (van sulfate earth), polyaluminum chloride (P
AC), iron chloride, iron sulfate, etc. are used. In addition, a flocculation aid is sometimes used to enhance the formation of flocs, and as the flocculation aid, for example, a polymer flocculant, activated silicic acid, sodium alginate or the like is used.

The reaction tank 11 is formed, for example, as a cylindrical tank, and a stirrer 17 is vertically arranged in the reaction tank 11. A motor 18 is connected to the stirrer 17, and the stirrer 17 is rotated by the motor 18 to slowly stir the water 16 to be treated stored in the reaction tank 11. The stirrer 17 is installed closer to the peripheral surface than the center of the reaction tank 11, and a partition wall 19 made of an inclined plate is arranged in a widened space in the reaction tank 11. The partition 19 is a stirring unit 20 in which the stirrer 17 is housed.
And a non-stirring section 21 that is not affected by stirring by the stirrer 17. The partition 19 has a lower end connected to the bottom surface of the reaction tank 11 by welding or the like, an upper end extending toward the stirrer 17, and reaches the vicinity of the water surface of the water 16 to be treated.
Therefore, the stirrer 20 gradually reduces its horizontal area from the bottom to the top, and the non-stirrer 21 gradually increases its horizontal area from the bottom to the top.

In the stirring section 20, the water 16 to be treated which has flowed in from the supply pipe 14 is slowly stirred by the stirrer 17, and by this stirring action, the minute flocs 22 in the water 16 to be treated grow to form huge flocs 22A. I am doing it. That is, the stirring unit 20 is configured as a reaction unit in which the fine flocs 22B formed in advance in the supply pipe 14 by the coagulant grow.

The non-stirring section 21 is constructed as a separating section for separating the giant flocs 22A in the water 16 to be treated which has flowed in from the stirring section 20 from the micro flocs 22B. That is, the non-stirring portion 21 is separated from the stirring portion 20 by the partition wall 19, and the water 16 to be treated has almost no upstream or downstream, and is a relatively quiet storage portion. Then, as shown by the arrow in FIG. 1, while the treated water 16 flowing in from the stirring section 20 flows from the upper end of the partition wall 19 to the pit section 23 attached to the tank peripheral wall above the non-stirring section 21, huge flocs 22A are generated. It settles down due to its own weight, and only the minute flocs 22B flow into the pit portion 23. This pit portion 23 is a connection pipe 1
It is provided in the discharge part to 2 and supplies the treated water 16 containing the minute flocs 22B to the filtration tank 13 side through this pit part 23. Further, as shown in FIG. 2, in order to set the distance L between the upper end of the partition wall 19 and the pit portion 23 as long as possible, the partition wall 19 faces the pit portion 23 forming the discharge portion of the water to be treated, and the above-mentioned It is arranged so as to be inclined. Further, an extraction pipe 24 for discharging the flocs 22 settled inside is provided below the non-stirring portion 21, and the flocs 22 accumulated in the non-stirring portion 21 are periodically or continuously taken out from the extraction pipe 24. Is done.

The filter tank 13 is formed as a cylindrical tank, for example. A trough 2 is provided in the upper part of the filtration tank 13.
5 is provided to collect backwash drainage water when backwashing the filtration tank 13 described later by the trough 25, and to filter the water 16 to be treated through the trough 25 when filtering the water to be treated. Water is dispersed to 26. The filtration layer 26 is supported by a support bed 27, on which an anthracite layer 26A is formed, and as a lower layer, a sand layer 26B which is finer than the particles of anthracite and has a larger specific gravity than the anthracite. . Then, in the space below the support floor 27, clear treated water 28 from which the fine flocs 22B have been filtered off by the filtration layer 26 is collected and supplied to a predetermined water storage section or the like via the drain section 29.

A backwash pipe 30 for backwashing the filter layer 26 is attached to the filter tank 13. This backwash pipe 30 has 2
Direction branching pipes 30A and 30B. The branch pipe 30A is connected to a main pipe 31 which is horizontally disposed slightly above the filtration layer 26, and the branch pipe 30B is horizontally disposed below the support floor 27. The lower backwashing mechanism is connected to the distributor 32. On the other hand, as shown in FIG. 3A, a plurality of branch pipes 31A are horizontally connected to the main pipe 31, and further, a plurality of vertical pipes 31B are connected from each branch pipe 31A, and the lower ends of the vertical pipes 31B are connected. A strainer 31C is attached to the intermediate backwashing mechanism. Moreover, each strainer 31C is an anthracite layer 2
It is arranged so that the backwash water is dispersed over the entire boundary surface slightly above the boundary surface between 6A and the sand layer 26B. In this strainer 31C, a plurality of slits through which water passes but not through anthracite particles or sand particles are formed in the lateral direction as shown in FIG. 3B, and as shown by the arrow in FIG. Backwash water is spouted to the side. Further, valves 33A and 33B are attached to the respective branch pipes 30A and 30B, and the backwash water is supplied to the strainer 31C or the distributor 32 by opening and closing the valves 33A and 33B. In addition, as the intermediate backwash mechanism, the filtration layer 2
A horizontal branch pipe similar to that shown in FIG.
Although a structure in which a slit is provided may be provided, as described above, if the vertical pipes are embedded in the filtration layer 26 and the horizontal pipes are not embedded, the total projected area of the embedded portion is reduced. It is possible to prevent the buried pipe from being damaged by the weight of the filter medium above the buried portion.

The strainer 31C is an anthracite layer 26.
Used when backwashing only A, the distributor 32
Is used when backwashing the entire filtration layer 26. In other words, the strainer 31C is the anthracite layer 2
Used when 6A is clogged with minute flocs 22B to increase the filtration resistance, and the sand layer 26B is not so clogged with minute flocs 22B and the filtration resistance is not substantially increased.
The distributor 32 is used when the filtration resistance of the sand layer 26B becomes large and the entire filtration layer 26 is backwashed. With such a configuration, the anthracite layer 2
6A is backwashed using only the strainer 31C, and the large-scale backwashing operation of the whole filtration layer 26 is reduced as much as possible, and the water sampling time is made longer. In addition, a backwash drainage / discharge pipe 42 having a valve 41 is connected in the middle of the connection pipe 12 that connects the reaction tank 11 and the filtration bath 13, and the backwash drainage / discharge pipe 42 is used for backwashing. The generated waste water after cleaning is drawn out of the tank.

Next, the operation will be described. Supply pipe 14
Raw water is supplied from the coagulant, and a predetermined coagulant is added from the coagulant pipe 15 to sufficiently mix in the supply pipe 14 to form fine flocs, and the water to be treated 16 containing the fine flocs is supplied to the reaction tank 11. Supply continuously to. At this time, the motor 18 is driven to rotate the stirrer 17 relatively slowly to slowly agitate the water 16 to be treated in the agitator 20. The minute flocs 22B in the water 16 to be treated gradually grow and the giant flocs 22A To generate. Giant flocs 22A generated in the stirring unit 20 and remaining micro flocs 22
B flows out from the partition wall 19 to the non-stirring portion 21 side together with the water 16 to be treated.

The water 16 to be treated in the non-stirring section 21 is the stirring section 2
Huge flock 22A because it is much quieter than 0
Separated from the minute flocs 22B and settled on the bottom surface, and the minute flocs 22B overflow into the pit portion 23 together with the water 16 to be treated, and the trough 2 in the filtration tank 13 passes through the connecting pipe 12.
Inflow to 5. Then, the flocs 22 settled on the bottom of the non-stirring portion 21 are taken out of the reaction tank 11 through the taking-out pipe 24 regularly or continuously.

The water 16 to be treated which has flowed into the trough 25 in the filtration tank 13 passes through the trough 25, and then the anthracite layer 26.
It is distributed and supplied to the entire upper surface of A. While the treated water 16 is passing through the anthracite layer 26A by gravity, the fine flocs 22B in the treated water 16 are trapped in the gaps between the anthracite particles or adsorbed to the anthracite layer 26A. 16 and most of the flocs 22 are removed when they reach the sand layer 26B. Then, while the water 16 to be treated passes through the sand layer 26B, a small amount of flocs 22 remaining in the water 16 to be treated is removed by the sand layer 26B, and collects in the lower space of the support floor 27 as clear treated water 28. The treated water 28 is supplied to a predetermined water storage unit or the like via the drainage unit 29.

When the raw water is treated by the above-mentioned series of operations and a predetermined time has passed, the anthracite layer 26A is first clogged by the flocs 22 and the filtration speed is lowered.
At this point, the filtration resistance of the sand layer 26B has not decreased so much. Therefore, in order to backwash only the anthracite layer 26A, the valve 33A is opened and the valve 33B is opened.
Is closed and at the same time the valve 41 is opened to supply backwash water from the backwash pipe 30. This backwash water passes through the branch pipe 30A, the main pipe 31, and each vertical pipe 31B, and is jetted from the bottom layer of the anthracite layer 26A from each strainer 31C. As a result, the backwash water becomes an upward flow and passes through the anthracite layer 26A, and the anthracite layer 26A is fluidized to release the fine flocs 22B and disperse them in the backwash water. Then, the backwash drainage is collected by the trough 25, and is drained from the backwash drainage discharge pipe 42 to the outside of the filtration tank 13 through the valve 41, and the backwashing of the anthracite layer 26A is completed.

When the sand layer 26B is also clogged, the valve 33B is opened, the valve 33A is closed, and the backwash water is supplied.
The backwash water is supplied from the bottom floor space of the support floor 27 to the sand layer 2
6B and the anthracite layer 26A flow in an upward flow, during which the entire filtration layer 26 is fluidized. As a result, the fine flocs 22B are separated from the layers 26A and 26B and dispersed in the backwash water, and the entire backwash layer can be backwashed by extracting the backwash drainage from the backwash drainage pipe 42 through the trough 25. it can. When the backwashing water supply is stopped after the backwashing is finished, the sand layer 26B is formed as the lower layer and the anthracite layer 26A is formed as the upper layer in the filtration layer 26 due to the difference in specific gravity between the anthracite particles and the sand particles.

As described above, according to this embodiment, the inside of the reaction tank 11 is provided with the partition 19 for the stirrer 20 in which the stirrer 17 is installed, and the non-stirrer 21 separated from the stirrer 17.
Since it is divided into and, the stirring section 20 of the reaction tank 11 can be used as a normal reaction tank (slow stirring tank), and the non-stirring section 21 can be used as a sedimentation separation tank of the flocs 22, Unlike the conventional case, there is no need to provide a separation tank separately from the reaction tank, and the space occupied by the separation tank can be saved.

Further, the partition wall 1 is arranged so that the distance between the upper end of the partition wall 19 and the discharge part of the untreated water on the non-stirring part side is set as long as possible.
9 is provided at a position facing the discharge part so as to be inclined so that the horizontal cross-sectional area of the non-stirring part formed by the partition wall gradually increases from bottom to top. Most of the flocs 22A were captured in the non-stirring portion 21, and only the minute flocs 22B flowed into the filtration tank 13, so that the load on the filtration tank 13 was significantly reduced, and the number of backwashing of the filtration tank 13 was remarkably reduced. The water collection time can be lengthened and the water treatment efficiency can be significantly improved. In addition, a strainer 31 for dispersing backwash water between the anthracite layer 26A and the sand layer 26B.
By providing C, only the anthracite layer 26A can be backwashed.

In the above embodiments, the inclined plate was used as the partition wall, but the partition wall used in the present invention is not limited to the inclined plate, and the reaction tank is divided into a stirring section and a non-stirring section. Anything can be divided.

[0031]

According to the invention described in claim 1 of the present invention, space saving can be achieved, and further, the number of backwashing of the filtration tank having the filtration layers such as the anthracite layer and the sand layer can be reduced to reverse the filtration. It is possible to provide a turbidity filtration device that can shorten the washing time and thus the water sampling time.

According to a second aspect of the present invention, in the first aspect of the invention, the partition wall is formed by the partition wall at a position facing the discharge part of the water to be treated. Since the horizontal cross-sectional area of the non-stirring part gradually increases from the bottom to the top, the distance between the upper end of the partition and the discharge part should be longer when the volume of the non-stirring part is the same. Therefore, it is possible to provide the turbidity filtration device which can prevent the huge flocs from being discharged from the discharge part by the short path.

Further, according to the invention of claim 3 of the present invention, in the invention of claim 1 or 2,
Since the coagulant pipe for supplying the coagulant is connected to the supply pipe for supplying the raw water into the reaction tank, the coagulant is added to the raw water flowing in the supply pipe before the raw water is supplied to the reaction tank as the water to be treated. It is possible to provide a turbidity filtration device capable of producing fine flocs in the water to be treated before they are sufficiently mixed and flow into the reaction tank.

[Brief description of drawings]

FIG. 1 is a flow chart showing an embodiment of the turbidity filtration device of the present invention.

FIG. 2 is a plan view schematically showing the function of a reaction tank of the turbidity filtration device shown in FIG.

FIG. 3 is a plan view of the inside of the filtration tank shown in FIG. 1 viewed from above an anthracite layer.

FIG. 4 is a flow chart showing an example of a conventional decontamination filter.

FIG. 5 is a flow chart showing another example of a conventional turbidity removal filtration device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Decontamination filtration apparatus 11 Reaction tank 13 Filtration tank 14 Supply piping 15 Coagulant piping 16 Water to be treated 17 Stirrer 19 Partition wall and inclined plate 20 Stirring part 21 Non-stirring part 22 Flock (aggregating substance) 26 Filtration layer

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Satoshi Kitamura 5-5-16 Hongo, Bunkyo-ku, Tokyo Organo Corporation

Claims (3)

[Claims] 1. A reaction tank for receiving raw water to which a coagulant has been added as water to be treated and stirring the water to be treated with an agitator to generate an agglomerated substance, and the treated water from the discharge part of the reaction tank. In a turbidity filtration device provided with a filter tank that receives and filters coagulated substances in the water to be treated to obtain treated water,
The inside of the reaction tank is divided into a stirrer in which the stirrer is installed by a partition wall and a non-stirrer part separated from the stirrer, the treated water discharge part is provided above the non-stirrer part, and the lower part is also provided below. The turbidity filtration device is characterized in that each of the non-stirring portions is provided with a take-out pipe for taking out the agglomerated substance precipitated, at the bottom thereof. 2. The partition wall is inclined at a position facing the discharge part of the water to be treated so that the horizontal cross-sectional area of the non-stirring part formed by the partition wall gradually increases from the bottom to the top. The turbidity filtration device according to claim 1, wherein the turbidity filtration device is provided. 3. The turbidity filtration device according to claim 1, wherein a coagulant pipe for supplying the coagulant is connected to a supply pipe for supplying raw water into the reaction tank. .