JPH01249113A - Horizontal filter bed type low pressure drop upflow filtration device - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

[Detailed Description of the Invention] [Field of Industrial Application] This invention forms a filtration layer consisting of a large number of fibers by upward water flow in a waterway such as a sewer, and removes water in the waterway containing fine solids. This invention relates to a purifying device for water flowing in a waterway, which filters a large amount of water with low pressure loss by raising the water to pass through the filtration layer.

[Prior art]

Conventionally, as shown in FIGS. 11 to 14, a waterway water purification device has a wire mesh 15 attached to openings on both sides of a rectangular frame i4, and is surrounded by the frame 14 and each wire mesh 15. A filtration channel 16 is constructed by filling a large number of fiber masses 8 into the channel space, and an upstream weir 17 having a water passage section at the top is integrally provided in the lower half of the water channel 1, and the upstream weir 17 is integrally provided in the lower half of the water channel 1. A downstream weir 18 is integrally provided in the upper part of the waterway 1 on the downstream side of the side weir 17, and the filtration panel 16 is arranged horizontally between the upper side surface of the upstream weir 17 and the lower side surface of the downstream weir 18. At the same time, the filtration channel 16 is placed on the upstream side weir + 7, "F stream side weir 18 and the support protrusion 19 provided on the side wall of the water channel 1, and the flowing water in the channel 1 is transferred to the filtration channel 4. 16, the water is filtered by a filtration layer made up of a large number of fiber masses 8 in the p-filtration panel 16, and the water purified by the filtration is passed through the downstream weir 18. A purifying device for water flowing in a channel has been proposed so as to flow downstream through the water (see Japanese Patent Application No. 62-167090).

[Problem that the invention seeks to solve]

In the case of the conventional waterway water purification device, when the waterway water passes down and passes through the filtration layer made of a large number of fiber masses in the filtration panel 16, fine solid matter in the waterflow adheres to the surface layer of the filtration layer. As a result, the filtration capacity decreases early, the water permeability of the filtration layer decreases, the pressure drop of flowing water suddenly increases, and the fiber mass at the bottom of the filtration layer cannot be used effectively. The problem is that it can't be done. If the filtration capacity of the filtration layer decreases fc, it is necessary to take out the filtration filter from the waterway and wash the fiber mass 8 that makes up the filtration layer. There is a problem in that the bulk cleaning work and the filtration panel installation work after cleaning must be carried out frequently.

This invention maintains the filtration capacity of a filtration layer composed of a large number of fiber masses at a high level over a long period of time, keeps the pressure drop of running water low, and easily washes the fiber masses constituting the filtration layer. It is an object of the present invention to provide a horizontal p-bed type low pressure drop upward flow filtration device that can be used.

[Means for solving problems]

In order to achieve the above object, in the horizontal F-bed type low pressure drop upward flow filtration device of the present invention, a water passage opening 4 is provided in the waterway 1 between the upstream weir 2 and the waterway bottom 6. An overflow part is provided at the upper part of the downstream weir 5 provided in the waterway 1 on the downstream side of the upstream weir 2, and an overflow part is provided between the upstream weir 2 and the downstream weir 5, respectively. An upper perforated plate 6 for receiving fiber lumps and a lower perforated plate 7 for receiving fiber lumps are arranged in the water, and a large number of fibers float up under the lower perforated plate B for receiving fiber lumps by an upward water flow. Fiber mass consisting of mass 8 -
An overlayer 9 is formed, and a space 10 for allowing floating and falling of the fiber lumps is provided between the lower part of the overlayer 9 and the lower perforated plate 7 for receiving the fiber lumps.

'Even when the flow rate of the primary waterway is small, in order to maintain the flow velocity of the upward water flow above a certain level, a fixed partition plate 11 extending in the direction of the waterway is provided between the upper perforated plate 6 and the lower perforated plate, and An elevating partition plate 12 is provided above the fixed partition plate 11.

Furthermore, when the flow rate of the waterway is very large and the width of the waterway is narrow, a structure is provided between the upstream side weir 2 and the downstream side weir 5 extending in the width direction of the waterway and from the upper perforated plate 6 for receiving the fiber lumps. A plurality of fixed partition plates 11 extending across the lower perforated plate 7 for receiving fiber lumps are provided at intervals in the longitudinal direction of the waterway, and the level of the upper end of each fixed partition plate 11 and the level of the upper perforated plate B are set on the upstream side. It gradually decreases from there toward the downstream side.

Further, in order to wash the fiber lumps, an aeration pipe 16 for washing the fiber lumps is provided in the water below the lower porous plate 7.

[Effect]

Water flowing from the upstream side of the waterway 1 through the water flow opening 4 into the lower chamber 67 between the waterway bottom 6 and the lower perforated plate 7 passes through the lower perforated plate 7 and the upper perforated plate 6 and flows upward. The upward water flow causes each fiber mass 8 to float toward the upper perforated plate 6 to form a fiber mass filtration layer 9 at the lower part of the upper perforated plate B, and the upward water flow causes the fiber mass filtration layer 9 to flow. is filtered as it passes through.

As filtration progresses, fine solids in the upward water flow adhere to the lower layer of fiber lumps 8 in the fiber lump filtration layer 9, and as more than a certain amount of fine solids adhere, the apparent specific gravity of the fiber lumps 8 increases. Therefore, the filtration layer 9 cannot be formed, and the fiber lumps either float in the space 10 for allowing floating and falling or settle on the lower porous plate 7. Therefore, a new fiber mass 8 is always exposed at the bottom of the four layers 9 of the fiber mass Pii, and the low pressure loss upward flow filtration by the horizontal P bed continues. If the water is lowered to a certain level, even if the amount of water flowing in the waterway 1 decreases, the flow velocity of the upward water flow will be above a certain level.

Moreover, between the upstream side weir 2 and the downstream side weir 5, there are a plurality of holes extending in the waterway width direction and extending from the upper perforated plate 6 for receiving the fiber lumps to the lower perforated plate 7 for receiving the fiber lumps. Fixed partition plate 1
1 are provided at intervals in the longitudinal direction of the waterway, and the level of the upper end of each fixed partition plate 11 and the level of the upper perforated plate B are sequentially lowered from the upstream side to the downstream side, the water flow rate of the waterway is reduced. Even when there is a large number of waterways, the width of the waterway is narrow, and the flow rate changes, low pressure drop upward flow filtration can be performed using the horizontal door end.

Furthermore, by blowing out air from the fiber mass cleaning aeration pipe 13 provided in the water below the lower perforated plate 7, an upward flow of air-mixed water is generated, and the upward flow of the air-mixed water causes the upward flow of the air-mixed water. The fiber mass 8 between the perforated plate 6 and the lower perforated plate 7 can be washed by stirring in water.

〔Example〕

Next, the present invention will be explained in detail using illustrated examples.

9 and 10 show a filtering fiber mass 8 made of a crimped fiber mass used in an embodiment of the present invention, for example, a synthetic fiber of 20 to 200 deniers and a
A large number of crimped fibers 20 that have been crimped 10 times/inch are assembled into a bundle, and the center of the bundle of crimped fibers is made of a rigid synthetic fiber yarn, a hard gelastec band, or an aluminum wire. The bundled crimped fibers are bundled with a binding material 21 made of a corrosion-resistant metal wire such as the above, and the bundled crimped fibers are rolled into a substantially spherical shape with a diameter of 10 to 53 mm.

As the synthetic fibers constituting the crimped fibers 20, fibers having a specific gravity higher than that of water, such as polyvinylidene chloride fibers, are most suitable; however, other synthetic fibers may be used for polyvinyl chloride fibers and polyethylene fibers. You can.

In the case of a fiber mass with a diameter of approximately 665 crn using polyvinylidene chloride crimped fibers with a true specific gravity greater than 1, the sedimentation rate in water is approximately 90-100''/hr. In a uniform upward water flow faster than the settling speed, the fiber mass floats to the surface.

1 to 5 show a horizontal FIlf:u low pressure drop upward flow filtration device according to a first embodiment of the present invention using the fiber mass 8, which is installed in the upstream of the water channel 1. A side weir 2 is integrally connected to both side walls 22 of the waterway 10, a water passage opening 4 is provided between the bottom 5 of the waterway 1 and the lower end of the upstream weir 2, and the upstream weir 2 A downstream weir 5 having an overflow part at the upper part is provided on the downstream side of the downstream weir 5.
are integrally connected to the bottom 5 and both side walls 22 of the water channel 1,
Further, between the upstream weir 2 and the downstream weir 5, fixed partition plates 11 extending in the width direction of the waterway at an intermediate part in the height direction of the waterway are arranged at intervals in the longitudinal direction of the waterway, and each fixed partition Both ends of the plate 11 in the width direction are as follows.

It is fixed by melt to a vertical support member 25 fixed to the side wall 22.

At a level slightly lower than the upper surface of the downstream weir 5, there is a horizontal upper perforated fiber mass receiving plate 6 made of wire mesh, or between each adjacent fixed partition plate 11, and between the upstream weir 2 and the fixed partition plate 11. and between the downstream weir 5 and the fixed partition plate 11, and the peripheral portion of each fiber mass receiving upper perforated plate 6 is located between the upstream weir 2° and the downstream weir 5. A horizontal support member 24 made of wire mesh is placed on the upper horizontal support member 24 identified on the fixed partition plate 11 and the side wall 22 and fixed with bolts, and is located between the water channel bottom 6 and the upper perforated plate 6 for receiving the fiber mass. The lower perforated plate 7 for receiving fiber lumps is attached to each adjacent fixed partition plate 1.
1, the lower part of the upstream weir 2 and the fixed partition plate 1
1 and between the lower parts of the downstream weir 5 and the fixed partition plate 11, and the peripheral portion of the upper perforated plate 6 for receiving the valley fiber mass is arranged between the lower part of the upstream weir 2. Downstream weir5. It is mounted on a lower horizontal support member 25 fixed to the fixed partition plate 11 and the side wall 22, and fixed with bolts.

A large number of fiber lumps 8 are accommodated between the upper perforated plate for receiving fiber lumps 6 and the lower perforated plate for receiving fiber lumps 7, and between the upstream side weir 2 and the downstream side weir 5, from below to above. By the upward water flow flowing in
A fiber agglomerate filtration layer 9 consisting of a large number of fiber agglomerates 8 is formed at the lower part of the fiber agglomerate filtration layer 9, and a space 10 for allowing the fiber agglomerates to float down is provided between the lower part of the fiber agglomerate filtration layer 9 and the lower porous plate 7.

A vertical elevating partition plate 12 disposed above each of the fixed partition plates 11 is inserted between a pair of guide beams 26 erected and fixed at the upper part of each side wall 22, and The upper end of 12 is connected to a fluid cylinder 27 for lifting and lowering, and a vertical blocking plate 28 disposed at the upper part of the downstream weir 5 is connected between a pair of guide beams 29 that are installed and fixed over the upper part of each side wall 22. The upper end of the blocking plate 28 is connected to a lifting fluid cylinder 50.

A perforated plate for algae removal 61 made of a wire mesh is disposed upstream of the water passage opening 4 to prevent algae from entering the lower part of the lower perforated plate 7, and the perforated plate for algae removal 51 is Both side walls 2
A fiber mass cleaning aeration pipe 16 having a large number of aeration holes is disposed at the lower part of the lower perforated plate 7 and is inserted into a holding member 62 having a vertical groove-shaped cross section fixed to the lower porous plate 7 .
is connected to the blower 64 via an air pipe 66, and the water inlet of the water suction pipe 66 of the cleaning wastewater discharge pump 65 is connected to the upper part of the upper perforated plate B between the fixed partition plate 11 on the downstream side and the downstream weir 5. It is located in

It is sufficient that the thickness of the fiber agglomerate filtration layer 9 is set to, for example, 200111K, and the distance between the upper porous plate 6 and the lower porous plate 7 is about twice the thickness of the agglomerate filtration layer 9.

When performing filtration, if the flow rate of the upward water flow from the lower chamber 67 between the channel bottom 6 and the lower perforated plate 7 toward the upper part of the upper perforated plate 6 is 100"/hr or more, each fiber mass 8 The upper perforated plate 6 is floated toward the upper perforated plate B.
A fiber mass filtration layer 9 can be formed in close contact with the lower part of the filter.

Further, by using binding materials 21 made of materials with different specific gravity, the settling speed of the fiber mass 8 can be adjusted.

If the flow rate of the upward water flow is I Q O"/hr, the filtration area can be reduced appropriately by lowering the elevating partition plate 12 at an appropriate position and bringing it into contact with the upper part of the fixed partition plate 11. The flow rate of the upward water flow can be greater than I 00 ''/hr. When lifting/lowering the lifting partition plate 12, the flow rate of the waterway is measured by a measuring device, and the lifting fluid cylinder 27 is expanded/contracted via a control device based on a signal from the measuring device, thereby automatically lifting/lowering the lifting partition plate 12. You may let them.

Next, the operation of the water purification device of the first embodiment will be explained.

Water flowing from the upstream side of the waterway 1 through the water flow opening 4 into the lower chamber 67 between the waterway bottom 6 and the lower perforated plate 7 passes through the lower perforated plate 7 and the upper perforated plate 6 and flows upward. The upward water flow causes the fiber lumps 8 to float toward the upper perforated plate B, forming the entire fiber lump filtration layer 9 under the upper perforated plate B, and the upward water flow causes the fiber lump filtration layer 9 to be formed under the upper perforated plate B. It is filtered before passing through.

As the filtration progresses, fine solid matter in the upward water flow adheres to the lower layer fiber mass 8 in the fiber mass filtration layer 9, and the fiber mass 8 to which a certain amount or more of fine solid matter has adhered has a larger apparent specific gravity. The filtration layer 9 cannot be formed, and the fiber lumps float in the space 10 for allowing floating and falling, or settle on the lower porous plate 7. Therefore, a new fiber mass 8 is always exposed at the bottom of the fiber mass filtration layer 9, and low pressure loss upward flow filtration by the horizontal door floor is continued.

When the number of fiber lumps 8 floating or settling with fine solid matter adhering to them increases in the space 10 for allowing floating or falling of fiber lumps, and it becomes necessary to clean the fiber lumps 8, the blocking plate 28 is lowered and the downstream weir 5 is removed. is lowered to the upper part of the fiber lump cleaning aeration pipe 13 and blows out air to generate an upward flow of air-mixed water.The upward flow of the air-mixed water destroys the fiber lump filter layer 9 and The mass 8 is stirred and floated between the upper perforated plate 6 and the lower perforated plate 7 by an air-mixed water flow, and fine solid matter adhering to the fiber mass 8 is washed and removed. Further, the cleaning drainage water is discharged from the upper part of the upper porous plate 6 to the outside of the water channel by the cleaning drainage discharge bonder 65.

When the cleaning wastewater is discharged to the outside of the waterway, cleaning water automatically flows into the cleaning section from the upstream side of the upstream weir 2.

In a sewage treatment plant, washing wastewater is sent to an upstream part such as a settling basin to treat concentrated fine solids in the washing wastewater.

The horizontal door type low pressure drop upward flow filtration apparatus for purifying water flowing in a waterway according to the first embodiment is installed, for example, in an intermediate waterway where final sedimentation tank treated water is collected in a sewage treatment plant.

By removing the algae removal perforated plate 61 and installing a blocking plate in its place, the waterway 1 is partitioned off at the upstream weir 20, and a gate (not shown in the figure) provided at the lower opening of the downstream weir 5 is used. (omitted) may be opened and the water on the downstream side of the waterway may be used as cleaning water.

Next, the operation of the water purification apparatus of the first embodiment will be explained with reference to the principle diagram shown in FIG. 4.

An upward water flow (+
00”/hr), Figure 4 (2)
As shown in FIG. 4, the fiber mass 8 floats toward the upper perforated plate B, and as shown in FIG. 4(B), a fiber mass filtration layer 9 is formed under the upper perforated plate B.

As the filtration of the upward water flow progresses through the fiber mass filtration layer 9,
The fiber mass 8 to which a certain amount or more of fine solid matter is attached floats in the space 10 or settles on the lower porous plate Z,
At the end of the filtration, as shown in FIG. 4(C), a relatively thin fibrous mass filtration layer 9 remains under the upper porous plate 6, and the fibrous mass 8 also exists under the space 10.

Next, as shown in FIG.
The fiber mass 8 is stirred and floated between the lower porous plate 7 and the lower porous plate 7, and the fiber mass 8 is washed. After cleaning is complete, see Figure 4 ■
As shown in the figure, a fiber mass 8A containing a large amount of air bubbles is floating near the upper perforated plate B. From this state, Pa is restarted by the upward water flow.

FIG. 5 shows a second embodiment of the present invention implemented when the flow rate of water channel 1 is very large and the width of channel 1 is narrow. The lower edge, a large number of upper perforated plates 6, and a large number of lower perforated plates 7 are arranged so as to become lower from the upstream side to the downstream side, and the water passage opening 4 at the lower part of the upstream weir. The area is set large so that the pressure loss can be maintained at about 20 to 60 Aq.

In the case of the second embodiment, the water level 3 when the waterway flow rate decreases
8, filtration is performed by the fibrous filtration layer 9 on the downstream side of the waterway, and as the waterway flow rate gradually increases and the water level rises, the fibrous filtration layer 9 that performs filtration spreads toward the upstream side. Therefore, in the case of the second embodiment, even if the flow rate of the waterway decreases, an upward flow velocity of Ion"/hr or more can be obtained, and the elevating partition plate 12 in the first embodiment can be omitted. .

When filtration is performed by upward water flow as described above.

If there is a water level difference of about 200,111 Aq, 100 to 3
Since an upward water flow rate of 0.00 rn/hr can be obtained, fine solids in the flowing water of the waterway can be attached to the fiber mass 8 and removed.

Table 1 shows the results of a comparative test of low pressure drop upward water flow filtration and downward water flow filtration using the apparatus of the present invention for treated water from a final sedimentation tank of a sewage treatment plant.

Table 1 In the case of downward water flow filtration, the filtration pressure drop rises rapidly as the filtration progresses, but in the case of upward water flow filtration, the fiber agglomerates with fine solid matter adhere to the fiber mass filtration layer due to their own weight. 9, the pressure drop hardly increases even as filtration progresses.

6 to 8 show modified examples of the cleaning drainage discharge means. In the case of the first modified example shown in FIG. The water suction pipe 36 of the ponder 65 for discharging cleaning waste water is inserted into the cylindrical box body 69, and when cleaning the fiber mass 8, after the cleaning waste water flows into the cylindrical box body 39. It is discharged by a ponder 65 for discharging cleaning waste water.

In the case of the second modification shown in FIGS. 7 and 8, a vertical drainage introduction tube 40 with an open upper end is provided passing through the upper perforated plate 6 and the lower perforated plate 7.
One end of a drain pipe 41 is connected to the lower end, and the other end of the drain pipe 41 is disposed in a drain 42 provided outside the water channel 1. An on-off valve 43 is provided outside of the drain pipe 4 , and when the on-off valve 45 is opened to wash the fiber mass 8 , cleaning waste water flows into the interior from the upper end of the waste water introduction tube 40 and then flows into the drain pipe 4 .
1 and is discharged into the drainage channel 42.

When carrying out this invention, as the upper perforated plate 6, the lower perforated plate 7, and the algae removal perforated plate 61, a perforated plate obtained by punching a large number of holes into a metal plate may be used. In place of the plate 61, an endless circulation screen extending from the upstream side of the water passage opening 4 to above the water surface is installed, and the circulation screen is driven to circulate by a drive device to remove algae attached to the circulation screen IJ. etc. may be removed from the circulation screen above the water surface.

Further, a plurality of filtration waterways having the horizontal door floor type low pressure drop upward flow filtration device of the first embodiment or the second embodiment are arranged in parallel, and the upstream end of each filtration waterway is connected to a common upstream waterway. Additionally, the downstream end of each filtration waterway may be connected to a common downstream waterway.

〔Effect of the invention〕

Since the present invention is configured as described above, it produces the effects described below.

Water flowing from the upstream side of the water channel 1 through the water passage opening 4 into the lower chamber 37 between the water channel bottom 3 and the lower perforated plate 7 passes through the lower perforated plate 7 and the upper perforated plate 6 and flows upward. As each fiber mass 8 floats toward the upper perforated plate 6 due to the upward water flow, a fiber mass filtration layer 9 is automatically formed under the upper perforated plate 6 to perform upward water flow filtration. is formed, and as the filtration progresses, the fine solids in the upward water flow adhere to the lower fiber lumps 8 in the fiber lump filtration layer 9, and the fiber lumps 8 to which a certain amount or more of the fine solids have adhered have an apparent specific gravity. becomes dull and cannot form a filtration layer,
Since the fiber lumps float in the space 10 for allowing floating or fall or settle on the lower perforated plate 7, new fiber lumps 8 are always exposed at the bottom of the fiber lump filtration layer 9, thereby reducing pressure loss due to the horizontal door floor. Countercurrent filtration can be carried out continuously for a long period of time, and the entire fiber mass constituting the fiber mass filtration layer 9 can be effectively utilized.

In addition, by lowering the elevating partition plate 12 onto the fixed partition plate 11, even when the flow rate decreases, the flow velocity of the upward water flow can be maintained at a constant level or higher, and furthermore, the upstream weir 2
and the downstream weir 5, a plurality of fixed partition plates 11 extending in the direction of the waterway 1p and extending from the upper perforated plate 6 for receiving fiber lumps to the lower perforated plate 7 for receiving fiber lumps are installed in the longitudinal direction of the waterway. The level of the upper end of each fixed partition plate 11 and the level of the upper perforated plate 6 are successively lowered from the upstream side to the downstream side. Even when the width is narrow and the water flow rate changes, low pressure drop upward water flow filtration can be performed, and air is blown out from the aeration pipe 13 for cleaning fiber lumps provided in the water below the lower porous plate 7. By doing so, an upward flow of air-mixed water is generated, and the fiber mass 8 between the upper perforated plate 6 and the lower perforated plate 7 is stirred in the water by the upward flow of the air-mixed water, thereby easily and quickly. Can be washed.

[Brief explanation of the drawing]

1 to 6 show a first embodiment of the present invention, in which FIG. 1 is a longitudinal sectional side view of a horizontal door floor type low pressure loss upward flow filtration device, and FIG. 2 is a front view thereof. , FIG. 6 is an enlarged longitudinal sectional front view of a part of FIG. 2. Figure 4 is a diagram of the principle of upward water flow purification and fiber mass cleaning.
FIG. 5 is a longitudinal side view showing a horizontal door floor type low pressure loss upward flow filtration device # according to a second embodiment of the present invention, and FIG. 6 is a longitudinal side view showing a first modified row of washing wastewater discharge means. , FIG. 7 is a longitudinal sectional front view showing a second modification of the washing wastewater discharge means, FIG. 8 is a longitudinal sectional side view thereof, FIG. 9 is a front view of the fiber mass, and FIG. 10 is a sectional view thereof. FIG. 11 is a partially cutaway perspective view of a filter 79 flannel used in a conventional channel water purification device;
FIG. 2 is a vertical front view thereof, FIG. 13 is a vertical side view showing a conventional water purification device for running water, and FIG. 14 is a cross-sectional plan view thereof. In the figure, 1 is the waterway, 2 is the upstream weir, 6 is the bottom of the waterway,
4 is an opening for water flow, 5 is a downstream weir, 6 is an upper perforated plate for receiving fiber lumps, 7 is a lower perforated plate for receiving fiber lumps, 8 is a fiber lump,
9 is a fiber lump filtration layer, io is a space for allowing floating and falling fiber lumps,
11 is a fixed partition plate, 12 is an elevating partition plate, 13 is a diffuser pipe for cleaning the fiber mass, 20 is a crimped fiber, 21 is a binding material, 22 is 1
i4Q wall, 23 vertical support member, 24 upper horizontal support member, 25 lower horizontal support member, 26 peeled beam, 2
7 is a fluid cylinder for lifting, 28 is a blocking plate, 29 is a guide beam, 50 is a fluid cylinder for lifting, 51 is a perforated plate for algae removal, 66 is an air pipe, 54 is a blower, 35 is a bonder for discharging cleaning waste water, 36 39 is a water suction pipe, 39 is a cylindrical box body, 40 is a drainage introduction pipe, 41 is a drain pipe, 42 is a drainage channel, and 46 is an on-off valve. Figure 3 Figure 12 City [ City [ Inside Tochigi Factory

Claims (1)

[Scope of Claims] (1) A water passage opening 4 is provided between an upstream weir 2 provided in the waterway 1 and a waterway bottom 3, and a water passage opening 4 is provided in the waterway 1 on the downstream side of the upstream weir 2. An overflow part is provided at the upper part of the downstream weir 5 provided in
and a lower perforated plate 7 for receiving fiber lumps are arranged, and a fiber lump filtration layer 9 consisting of a large number of fiber lumps 8 floating by an upward water flow is formed below the upper perforated plate 6 for receiving fiber lumps, The lower part of the fiber lump filtration layer 9 and the lower porous plate 7 for receiving the fiber lumps
A horizontal filter bed type low pressure drop upflow filtration device in which a space 10 for allowing floating and falling of fiber lumps is provided between the (2) A fixed partition plate 11 extending in the channel width direction is provided between the upper perforated plate 6 and the lower perforated plate 7, and an elevating partition plate 12 is provided above the fixed partition plate 11. 1. The horizontal filter bed type low pressure drop upflow filtration device according to 1. (5) A plurality of fixings are provided between the upstream weir 2 and the downstream weir 5, extending in the channel width direction and extending from the upper perforated plate 6 for receiving fiber lumps to the lower perforated plate 7 for receiving fiber lumps. The partition plates 11 are provided at intervals in the longitudinal direction of the waterway, and the level of the upper end of each fixed partition plate 11 and the level of the upper perforated plate 6 for receiving fiber lumps are gradually lowered from the upstream side to the downstream side. 2. The horizontal filter bed type low pressure drop upflow filtration device according to claim 1. (2) The horizontal filter bed type low pressure loss upflow filtration apparatus according to claim 1, wherein a fiber agglomerate cleaning aeration pipe 13 is provided in the water below the fiber agglomerate receiving lower perforated plate 7.