JP2005000736A - Filter apparatus and activated carbon adsorbing device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a filter apparatus capable of uniformly backward washing a filter medium layer and an activated carbon layer to sufficiently develop a filtering function and an activated carbon adsorbing function after the backward washing and capable of preventing the lateral flow of raw water in a tank and the disturbance of the filter medium layer or the activated carbon layer when backward washing, and an activated carbon adsorbing device. <P>SOLUTION: The filter apparatus is constituted so that a drain trough 12, the filter medium layer 13 and a support material layer 14 are successively arranged in the tank 11 and the raw water 16, which flows in the drain trough 12 from a raw water introducing pipe 15, is filtered through the filter medium layer 13 while filtered water 18 is discharged to the outside of the tank 11 through a water gathering pipe 17 arranged to the support material layer 14. A perforated plate 22 is provided between the drain trough 12 and the filter medium layer 13 as a flow distribution member. By this constitution, a uniform filtering function is developed when raw water 16 is filtered. Further, when backward washing water is supplied to the water gathering pipe 17 to perform backward washing, the flow of backward washing water, which passes through the filter medium layer 13, becomes uniform to uniformly backward wash the filter medium layer 13. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a gravity-type or pressure-type filtration apparatus and activated carbon adsorption apparatus used in water purification plants, sewage treatment plants, factory water treatment plants, wastewater treatment plants, and the like.
[0002]
[Prior art]
Conventionally, as this type of filtration device and activated carbon adsorption device, there are a square type and a round type. FIG. 1 is a cross-sectional view illustrating a schematic configuration example of a conventional square filtration device. As shown in the figure, the filtration apparatus includes a tank 1 having a square section, and a plurality (two in the figure) of drainage troughs 2 and 2 are disposed in the upper part of the tank 1, and a filter medium layer 3 is disposed below the drainage troughs 2. And the support material layer 4 are disposed, the raw water 6 that has flowed into the drain troughs 2 and 2 through the raw water introduction pipe 5 is filtered by gravity through the filter medium layer 3, and the filtered filtered water 8 is put into the support material layer 4. The collected water collecting pipe 7 is collected through a number of holes 7 a provided on the lower side thereof, and is discharged out of the tank 1 through the water collecting pipe 7. This is an example of a gravity type, but in the case of a pressure type, pressure is applied to the raw water 6 in the tank 1, and the raw water 6 is forced through the filter medium layer 3 at this pressure.
[0003]
Further, as shown in FIG. 2, the round filter device includes a tank 11 having a round cross section, a drain trough 12 is disposed in the upper part of the tank 11, and a filter medium layer 13 is disposed below the trough 12. And the support material layer 14, the raw water 16 that has flowed into the drain trough 12 through the raw water introduction pipe 15 is filtered by gravity through the filter medium layer 13, and the collected water is disposed in the support material layer 14. 17 is collected through a number of holes 17 a provided on the lower side thereof, and filtered water 18 is discharged out of the tank 11 through the water collecting pipe 17. This is an example of a gravity type, but in the case of a pressure type, pressure is applied to the raw water 16 in the tank 11, and the raw water 16 is forcibly passed through the filter medium layer 13 with this pressure.
[0004]
When the square filter is backwashed, the backwashing water 9 is supplied to the water collecting pipe 7 as shown in FIG. 3, and the backwashing water 9 flowing out from the numerous holes 7 a of the water collecting pipe 7 is the support material layer 4. Through the filter medium layer 3, it is collected in the drainage trough 2 and discharged from the drainage trough 2 to the outside of the tank 1 as drainage 10. In this case, as shown in the figure, the velocity distribution of the backwash water 9 on the surface of the filter medium layer 3 is fast in the vicinity of the drainage troughs 2 and 2 as indicated by an arrow A, and becomes slower as the distance increases. That is, the flow rate of the backwash water on the surface of the filter medium layer 3 is not uniform.
[0005]
When the round filter is backwashed, backwash water 19 is supplied to the water collection pipe 17 as shown in FIG. 4, and the backwash water 19 flowing out from the numerous holes 17 a of the water collection pipe 17 is supported by the support material layer 14. Through the filter medium layer 13, it is collected in the drainage trough 12 and discharged from the drainage trough 12 to the outside of the tank 11 as drainage 20. In this case, as shown in the figure, the velocity distribution of the backwash water 19 on the surface of the filter medium layer 13 is fast in the vicinity of the drainage trough 12 as shown by the arrow B, and becomes slower as the distance increases.
[0006]
In the case of backwashing as described above, the backwash waters 9 and 19 are allowed to flow upward and flow to the filter media layers 3 and 13, but the backwash waters 9 and 19 do not flow uniformly through the filter media layers 3 and 13. There is a problem that backwashing cannot be performed. In particular, as shown in FIG. 4, this situation clearly appears in a filtration device having a round cross section of the tank 11. When the backwashing water 9 and 19 does not flow uniformly in the filter media layers 3 and 13 in this way, the filter media layers 3 and 13 are not backwashed uniformly, and the raw water 6 and 16 are filtered after backwashing. There was a problem that a portion where the detained matter in the raw water removed by the filter medium layers 3 and 13 could not be sufficiently removed was generated, and a sufficient filtration function could not be exhibited.
[0007]
1 and 2, if an activated carbon layer is used instead of the filter media layers 3 and 13, an activated carbon adsorption device that adsorbs and removes impurities in the raw water by the activated carbon layer is configured. Even in such an activated carbon adsorption device, when backwashing is performed, there is a problem that uniform backwashing cannot be performed. When raw water is passed through the activated carbon layer after backwashing, the detained material in the raw water is sufficiently adsorbed. There was a problem that a part to be removed and a part that could not be sufficiently adsorbed and removed occurred, and a sufficient activated carbon adsorption function could not be exhibited.
[0008]
[Patent Document 1]
JP 58-49491 A [Patent Document 2]
Japanese Patent Laid-Open No. 10-332204
[Problems to be solved by the invention]
The present invention has been made in view of the above points, and can perform uniform backwashing of the filter medium layer and the activated carbon layer, sufficiently exhibit the filtration function and the activated carbon adsorption function after backwashing, and a tank of raw water It is an object of the present invention to provide a filtration device and an activated carbon adsorption device that can prevent disturbance of a filter medium layer and an activated carbon layer during cross flow and back washing.
[0010]
[Means for Solving the Problems]
In order to solve the above-mentioned problem, the invention according to claim 1 is arranged such that a drain trough or a porous inflow pipe, a filter medium layer, and a support material layer are arranged in order in a cylindrical tank, and the drainage trough or the porous inflow pipe from the raw water introduction pipe. In the filtration device configured to filter the raw water flowing into the filter through the filter medium layer and to discharge it through the water collecting pipe or strainer through the support material layer, the drainage trough or between the porous inflow pipe and the filter medium layer is filtered and vice versa. A rectifying member is provided to make the flow of raw water and backwash water uniform during washing.
[0011]
By providing a flow regulating member between the drainage trough or the porous inflow pipe and the filter medium layer as described above, when the raw water is filtered, the filtration speed of the entire filter medium layer becomes uniform, and a uniform filtration function is exhibited. , Filtered water with less solids is obtained. Moreover, when backwashing water is supplied to the water collecting pipe or the strainer and backwashing is performed, the flow of backwashing water passing through the filter medium layer becomes a uniform flow, so that the filter medium layer can be backwashed uniformly.
[0012]
The invention according to claim 2 is the filtration device according to claim 1, wherein a partition plate for partitioning the inside of the tank in the vertical direction is provided in the tank, and the upper part of the filter medium layer of the partition plate is a porous plate. It is characterized by.
[0013]
By providing a partition plate for partitioning the inside of the tank in the vertical direction in the tank as described above, the filter medium layer and the support material layer are partitioned into a plurality of parts. Disturbance can be prevented and disturbance of the filter medium layer during backwashing can also be prevented.
[0014]
According to a third aspect of the present invention, in the filtration device according to the first or second aspect, the rectifying member is formed of a perforated plate, and the water collecting pipe is disposed in the tank in the longitudinal direction thereof, and is orthogonal to the main pipe. The dimensions of the perforated plate of the rectifying member and the branch pipe of the water collecting pipe in the tank transverse direction are 0.5D to 1.0D, where D is the diameter of the tank. It is characterized by that.
[0015]
As described above, the transverse dimension of the perforated plate of the rectifying member and the branch pipe of the water collecting pipe is set to 0.5D to 1.0D, where D is the diameter of the tank, so that the flow rate in the filter medium layer is uniform. Can be kept in.
[0016]
In the invention according to claim 4, the drainage trough or the porous inflow pipe, the activated carbon layer, and the support material layer are sequentially arranged in the cylindrical tank, and the raw water that has flowed into the drainage trough or the porous inflow pipe by the raw water introduction pipe is disposed. In the activated carbon adsorbing device configured to remove impurities in the raw water through the activated carbon layer and to discharge the water from which the impurities have been removed to the outside of the tank through the water collecting pipe or the strainer, the drainage trough or between the porous inflow pipe and the activated carbon layer Further, the present invention is characterized in that a rectifying member having an effect of making the flow of raw water and backwash water uniform during impurity adsorption removal and backwashing is provided.
[0017]
As described above, when the raw water activated carbon adsorption treatment is performed by providing a rectifying member between the drain trough or the porous inflow pipe and the activated carbon layer, the raw water flow velocity of the entire activated carbon layer becomes uniform, and the uniform adsorption function Is obtained, and filtered water with less solid matter is obtained. Moreover, when backwashing water is supplied to the water collecting pipe or the strainer and backwashing is performed, the flow of backwashing water passing through the activated carbon layer becomes a uniform flow, so that the activated carbon layer can be backwashed uniformly.
[0018]
According to a fifth aspect of the present invention, in the activated carbon adsorption apparatus according to the fourth aspect of the present invention, a partition plate for partitioning the interior of the tank in the vertical direction is provided in the tank, and the activated carbon layer upper portion of the partition plate is a porous plate. It is characterized by being.
[0019]
Since the activated carbon layer and the support material layer are partitioned into a plurality of parts by providing a partition plate for partitioning the inside of the tank in the vertical direction as described above, the lateral flow in the raw water tank is prevented during the adsorption of impurities by the activated carbon layer. In addition to preventing disturbance of the activated carbon layer, disturbance of the activated carbon layer during backwashing can also be prevented.
[0020]
According to a sixth aspect of the present invention, in the activated carbon adsorption apparatus according to the fourth or fifth aspect, the rectifying member is formed of a perforated plate, and the water collecting pipe is disposed in the tank in the longitudinal direction thereof, and the main pipe is connected to the main pipe. The dimensions of the perforated plate of the flow regulating member and the branch pipe of the water collecting pipe in the transverse direction of the tank are 0.5D to 1 where D is the diameter of the tank. 0.0D.
[0021]
As described above, the transverse dimension of the perforated plate of the rectifying member and the branch pipe of the water collecting pipe is set to 0.5D to 1.0D, where D is the diameter of the tank, so that the flow velocity in the activated carbon layer is uniform. Can be kept in.
[0022]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings. FIG. 5 is a cross-sectional view showing a configuration example of a schematic configuration of a round filter according to the present invention. As shown in the drawing, the filtration device includes a tank 11 having a round cross section, a drain trough 12 is disposed in the upper part of the tank 11, and a filter medium layer 13 and a support material layer 14 are disposed below the drain trough 12. A water collection pipe 17 is arranged in the layer 14. The raw water 16 that has flowed into the drainage trough 12 through the raw water introduction pipe 15 is filtered through the filter medium due to its gravity, and the filtered water is provided in the water collecting pipe 17 disposed in the support material layer 14 on the lower side thereof. 2 is the same as the filtering device shown in FIG. 2 in that it flows in through the hole 17a and is discharged as filtered water 18 out of the tank 11 through the water collecting pipe 17. The difference between the present filtration device and the filtration device shown in FIG. 2 is that a porous plate 22 is disposed between the filter medium layer 13 and the drainage trough 12 as a flow straightening member.
[0023]
Since the porous plate 22 is disposed between the filter medium layer 13 and the drainage trough 12 as described above, the raw water flowing out of the drainage trough 12 flows into the filter medium layer 13 in a uniform flow, and the entire filter medium layer 13 is filtered. The speed becomes uniform and a uniform filtration function is obtained. When backwashing water 19 is supplied to the water collecting pipe 17 and backwashing is performed, as shown in FIG. 6, the backwashing water 19 flowing out from the numerous holes 17a of the water collecting pipe 17 is supported by the support material layer 14 and the filter medium. It is collected in the drainage trough 12 through the layer 13 and discharged from the drainage trough 12 to the outside of the tank 11 as drainage 20, but the backwash water 19 that has passed through the filter medium layer 13 is rectified by the perforated plate 22 and its flow velocity Since the distribution is a uniform flow as indicated by an arrow D, the flow of backwash water 19 passing through the filter medium layer 13 is also uniform, and the filter medium layer 13 can be uniformly backwashed. Therefore, when the raw water 16 is supplied through the raw water introduction pipe 15 after backwashing, the filter medium layer 13 can sufficiently exhibit its filtering function.
[0024]
In the above embodiment, the example in which the porous plate 22 is used as a rectifying member that has the effect of making the flow uniform is shown. However, the rectifying member that has the effect of making the flow uniform is limited to this. Instead, for example, a wire net or a fish net may be used. However, the flow-down portion where the raw water flows down requires a certain flow rate in order to make the flow rate uniform, and the flow-down area needs to be designed to be about 3 to 30% of the surface area of the filter medium forming the filter medium layer 13. If the flow rate is too high, the loss increases and the energy loss of the entire filtration device increases, which is not preferable. Although not shown, a porous inflow pipe may be provided in place of the drain trough 12, and raw water from the raw water introduction pipe 15 may be introduced into the porous inflow pipe. Although not shown in the drawings, a strainer mounting plate having a large number of strainers attached thereto is disposed under the support material layer 14 instead of the water collecting pipe 17, and the filtered water passing through the filter material layer 13 and the support material layer 14 is passed through the strainer. You may make it discharge | emit out of the tank 11. FIG.
[0025]
7 to 9 are diagrams showing a configuration example of a schematic configuration of the round filter according to the present invention, FIG. 7 is a side sectional view, FIG. 8 is a sectional view taken along line AA in FIG. 7, and FIG. It is BB sectional drawing. As shown in the figure, the present filtration device comprises a cylindrical tank 11 having a round cross section, a drain trough 12 is disposed in the upper part of the tank 11, and a perforated plate 22 and a filter medium layer 13 are provided as rectifying members therebelow. The support material layer 14 is disposed, and the water collecting pipe 17 is disposed in the support material layer 14. Raw water 16 is introduced into the drainage trough 12 from the raw water introduction pipe 15, filtered through the filter medium layer 13 by gravity, and the filtered water is discharged out of the tank 11 as filtered water 18 through the support material layer 14 and the water collection pipe 17.
[0026]
The water collecting pipe 17 includes a main pipe 17-1 and a branch pipe 17-2. The branch pipe 17-2 is orthogonal to the main pipe 17-1, and is connected to the longitudinal direction thereof at a predetermined interval. The branch pipe 17-2 is a porous pipe having a large number of holes formed on the outer surface. It is necessary to design the porous plate 22 and the water collecting pipe 17 in association with each other. In the apparatus cross section (transverse cross section of the tank 11), the diameter of the tank 11 is D, and the width of the porous plate 22 and the branch pipe 17- If the length dimension of 2 is set within 0.5 to 1.0 D, the flow rate in the filter medium layer 13 can be kept uniform.
[0027]
An intermediate partition plate 23 is provided in the central portion of the tank 11 in the vertical direction, and the filter medium layer 13 and the support material layer 14 are partitioned left and right with the intermediate partition plate 23 interposed therebetween. A number of holes 23 a are formed in the upper part of the intermediate partition plate 23 from the filter medium layer 13. Thus, by providing the intermediate partition plate 23 in the central part of the tank 11, the raw water 16 flowing into the tank 11 is prevented from flowing laterally in the tank 11, and the filter medium layer 13 is prevented from being disturbed due to the lateral flow. Can do. Moreover, the movement of the filter medium layer 13 or the support material layer 14 can also be prevented at the time of backwashing. Since the intermediate partition plate 23 above the filter medium layer 13 is provided with a large number of holes 23a, the raw water above the filter medium layer 13 freely flows through the holes 23a. In addition, although the example which provided the one intermediate partition plate 23 in the center part of the tank 11 was shown in the said example, multiple partition plates may be provided and the inside of the tank 11 may be divided into plurality.
[0028]
10 and 11 are diagrams showing a configuration example of a schematic configuration of the round filter according to the present invention, FIG. 10 is a side sectional view, and FIG. 11 is a sectional view taken along line AA of FIG. As shown in the figure, the present filtration device comprises a cylindrical tank 11 having a round cross section, and a porous inflow pipe 24 having a large number of holes formed on the outer surface is disposed in the upper part of the tank 11, and below that Further, a perforated plate 22, a filter medium layer 13 and a support material layer 14 are arranged as rectifying members, and a strainer mounting plate 26 in which a number of strainers 25 are attached is arranged below the support material layer 14. The raw water 16 is introduced into the porous inflow pipe 24 from a raw water introduction pipe (not shown) at a predetermined pressure, filtered through the filter medium layer 13, and the filtered water that has passed through the support material layer 14 is a number of strainers 25 attached to the strainer mounting plate 26. Then, it flows down to the bottom of the tank 11 and is discharged from the discharge port 27 to the outside of the tank 11.
[0029]
As described above, by arranging the flow straightening member having the effect of uniforming the flow of the porous plate 22 between the filter medium layer 13 and the drainage trough 12 or the porous inflow pipe 24, the following in the case of filtration and backwashing: The following effects can be obtained.
[0030]
[In the case of filtration]
(1) The entire filtration rate of the filter medium layer 13 becomes uniform.
(2) As a result, the uniform filtering function of the filter medium layer 13 is exhibited, and filtered water with less solid matter is obtained.
[0031]
[For backwashing]
(1) The entire backwashing speed of the filter medium layer 13 becomes uniform.
(2) As a result, the filter medium layer 13 is not soiled, a uniform filtration function is exhibited, and there is little loss during filtration.
(3) Further, there is no place where the backwashing speed is high, and the outflow of the filter medium of the filter medium layer 13, the disturbance of the support material of the support material layer 14, and the damage of the water collecting pipe 17 or the strainer mounting plate 26 and the strainer 25 do not occur.
[0032]
Although the said embodiment is a filtration apparatus provided with the filter medium layer 13, if it replaces with this filter medium layer 13 and uses an activated carbon layer, it will become an activated carbon adsorption apparatus. Even in the activated carbon adsorbing device configured as described above, when backwashing water is supplied to the lower side of the water collecting pipe 17 and the strainer mounting plate 26 and backwashing is performed, as in the case of the filtration device described above, a uniform backside of the activated carbon layer is performed. Washable.
[0033]
The present invention is not limited to the above-described embodiment, and various modifications can be made within the scope of the same technical idea as the invention described in each claim.
[0034]
【The invention's effect】
As described above, according to the invention described in each claim, the following excellent effects can be obtained.
[0035]
According to the invention described in claim 1, when the raw water is filtered by providing a rectifying member between the drain trough or the porous inflow pipe and the filter medium layer, the filtration rate of the entire filter medium layer becomes uniform, It is possible to provide a filtration device that exhibits a uniform filtration function and obtains filtered water with less solid matter. Moreover, when backwashing water is supplied to the water collecting pipe or the strainer and backwashing is performed, the flow of backwashing water passing through the filter medium layer becomes a uniform flow, so that the filter medium layer can be backwashed uniformly.
[0036]
According to invention of Claim 2, by providing the partition plate which partitions off the inside of this tank in an up-down direction in a tank, a filter medium tank and a support material layer are divided into plurality, and the lateral flow in the tank of raw | natural water is filtered at the time of filtration. It is possible to prevent the disturbance of the filter medium layer and to prevent the disturbance of the filter medium layer during backwashing.
[0037]
According to invention of Claim 3, the dimension of the perforated plate of the rectifying member and the branch pipe of the water collecting pipe in the transverse direction of the tank is set to 0.5D to 1.0D, where D is the diameter of the tank. It is possible to provide a filtration device that can maintain a uniform flow rate in the filter medium layer, exhibit a uniform filtration function of the filter medium layer, and obtain filtered water with less solid matter. Moreover, when backwashing water is supplied to the water collecting pipe or the strainer and backwashing is performed, the flow of backwashing water passing through the filter medium layer becomes a uniform flow, so that the filter medium layer can be backwashed uniformly.
[0038]
According to the invention described in claim 4, when the raw water activated carbon adsorption treatment is performed by providing a rectifying member between the drain trough or the porous inflow pipe and the activated carbon layer, the raw water flow velocity of the entire activated carbon layer is uniform. Thus, an activated carbon adsorbing device can be provided that exhibits a uniform adsorbing function and provides filtered water with less solid matter. Moreover, when backwashing water is supplied to the water collecting pipe or the strainer and backwashing is performed, the flow of backwashing water passing through the activated carbon layer becomes a uniform flow, so that the activated carbon layer can be backwashed uniformly.
[0039]
According to the invention described in claim 5, by providing the partition plate for partitioning the inside of the tank in the vertical direction in the tank, the activated carbon layer and the support material layer are partitioned into a plurality of tanks, and the raw water tank during the adsorption of impurities by the activated carbon layer It is possible to prevent the lateral flow of the inside, prevent disturbance of the activated carbon layer, and also prevent disturbance of the activated carbon layer during backwashing.
[0040]
According to the invention described in claim 6, the dimensions of the perforated plate of the rectifying member and the branch pipe of the water collecting pipe in the transverse direction of the tank are set as 0.5D to 1.0D, where D is the diameter of the tank. It is possible to provide an activated carbon adsorption device that can maintain a uniform flow rate in the activated carbon layer, exhibit a uniform adsorption function of the activated carbon layer, and obtain treated water with less solid matter. Moreover, when backwashing water is supplied to the water collecting pipe or the strainer and backwashing is performed, the flow of backwashing water passing through the activated carbon layer becomes a uniform flow, so that the activated carbon layer can be backwashed uniformly.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a schematic configuration example of a conventional square filtration device.
FIG. 2 is a cross-sectional view showing a schematic configuration example of a conventional round filtration device.
FIG. 3 is a view for explaining a backwashing operation of a conventional square filtration device.
FIG. 4 is a diagram for explaining a backwashing operation of a conventional round filter device.
FIG. 5 is a cross-sectional view showing a schematic configuration example of a round filter according to the present invention.
FIG. 6 is a view for explaining the backwashing operation of the round filter according to the present invention.
FIG. 7 is a diagram showing a configuration example of a schematic configuration of a round filter device according to the present invention.
8 is a cross-sectional view taken along the line AA in FIG.
9 is a sectional view taken along line BB in FIG.
FIG. 10 is a diagram showing a configuration example of a schematic configuration of a round filter device according to the present invention.
11 is a cross-sectional view taken along the line AA in FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 11 Tank 12 Drain trough 13 Filter material layer 14 Support material layer 15 Raw water introduction pipe 16 Raw water 17 Catch pipe 18 Filtration water 19 Backwash water 20 Drain 21 Porous plate 22 Porous plate 23 Intermediate partition plate 24 Porous inflow pipe 25 Strainer 26 Strainer mounting plate 27 Discharge port

Claims (6)

A drainage trough or a porous inflow pipe, a filter medium layer, and a support material layer are sequentially disposed in a cylindrical tank, and raw water that has flowed into the drainage trough or the porous inflow pipe from the raw water introduction pipe is filtered through the filter medium layer, and In a filtration device configured to discharge out of a tank through a water collecting pipe or strainer through a support material layer,
A filtration device comprising a flow regulating member for making the flow of raw water and backwash water uniform during filtration and backwashing between the drainage trough or porous inflow pipe and the filter medium layer. The filtration device according to claim 1,
A filtration apparatus comprising: a partition plate for partitioning the interior of the tank in the vertical direction in the tank, wherein the upper part of the filter medium layer of the partition plate is a porous plate. The filtration device according to claim 1 or 2,
The rectifying member is constituted by a perforated plate, and the water collecting pipe is constituted by a main pipe disposed in the longitudinal direction in the tank and branch pipes orthogonal to the main pipe and connected at predetermined intervals in the longitudinal direction,
The filtration device according to claim 1, wherein the perforated plate of the rectifying member and the branch pipe of the water collecting pipe have a dimension in the tank transverse direction of 0.5D to 1.0D, where D is the diameter of the tank. A drain trough or a porous inflow pipe, an activated carbon layer, and a support material layer are arranged in this order in a cylindrical tank, and the raw water introduced into the drainage trough or the porous inflow pipe by the raw water introduction pipe is passed through the activated carbon layer to remove impurities in the raw water. In the activated carbon adsorber configured to remove the water from which the impurities have been removed through the water collection pipe or the strainer,
An activated carbon adsorbing device comprising a rectifying member for making the flow of raw water and backwashing water uniform during impurity adsorption removal and backwashing between the drainage trough or porous inflow pipe and the activated carbon layer. In the activated carbon adsorption apparatus according to claim 4,
An activated carbon adsorption apparatus, wherein a partition plate for vertically partitioning the interior of the tank is provided in the tank, and the activated carbon layer upper portion of the partition plate is a porous plate. In the activated carbon adsorption apparatus according to claim 4 or 5,
The rectifying member is constituted by a perforated plate, and the water collecting pipe is constituted by a main pipe disposed in the longitudinal direction in the tank and branch pipes orthogonal to the main pipe and connected at predetermined intervals in the longitudinal direction,
An activated carbon adsorbing apparatus, wherein the perforated plate of the rectifying member and the branch pipe of the water collecting pipe have dimensions in the tank crossing direction of 0.5D to 1.0D, where D is the diameter of the tank.

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