JP2998552B2 - Rotary drum type solid-liquid separator - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a rotary drum type solid-liquid separator for separating solid-liquid in raw water.

[0002]

2. Description of the Related Art A rotary drum type solid-liquid separation device is provided with a filter drum mounted on a body and horizontally disposed, and is configured so that raw water is introduced into the filter drum. The introduced raw water passes through the rotating filter cloth of the filter drum and is discharged to the outside, and the solid cloth in the raw water is separated by the filter cloth. That is, the solid components in the raw water are captured on the inner surface of the filter cloth, and the raw water after the solid components are separated and removed, that is, the filtered water, is discharged to the outside of the filtration drum.

[0003] The captured solid component, as it is, clogs the filter cloth. Therefore, in order to maintain the filtration performance of the filter cloth, that is, the filter drum, it is necessary to remove the captured solid component from the filter cloth. For this reason, when the filter cloth is exposed from the raw water to the outside, the filter cloth is sprayed with washing water, and the captured solid components are washed off. After being collected with the washing water in the collection hopper inside, it is discharged to the outside of the filtration drum. More specifically, the filtration drum is rotatably supported on a central axis, and a passage connecting the collection hopper and a pipe outside the filtration drum is formed in the central axis.

[0004]

Since the filter cloth of the filtration drum has low air permeability, the washing water collected together with the solid components in the collection hopper is rapidly discharged from the collection hopper through the passage and the pipe on the central shaft. Then, along with this discharge, a large amount of air in the filtration drum is also discharged, and the inside of the filtration drum may become negative. When the pressure inside the filter drum becomes negative, the solid components captured by the filter cloth are separated from the filter cloth and fall into raw water before being washed, and the solid component recovery performance is reduced.

The present invention has been made in view of the above-mentioned circumstances, and an object of the present invention is to prevent the inside of a filtration drum from becoming negative pressure and to stably maintain the solid component recovery performance. SUMMARY OF THE INVENTION An object of the present invention is to provide a rotary drum type solid-liquid separation device that can be used.

[0006]

The rotary drum type solid-liquid separation device of the present invention rotatably supports a filter drum having a filter medium mounted on a body on a hollow central shaft, and is introduced inside the filter drum. The raw water is passed through a filter medium while rotating a filtration drum to separate solid and liquid in the raw water, and a solid component captured by the filter medium is washed off with washing water and collected in a collection hopper.
The collected solid component is discharged from the collection hopper together with the washing water to the outside of the filtration drum through the inside of the central shaft, and a ventilation means for communicating the inside of the central shaft with the atmosphere is provided.

[0007] Then, the vent means comprises a vent pipe extending upward from the site of the center axis located outside the filtration drum.

[0008]

According to the rotary drum type solid-liquid separator described above,
When the collected solid component is discharged from the collecting hopper together with the washing water to the outside of the filtration drum through the central shaft, outside air is introduced into the central shaft through a ventilation pipe of a ventilation means.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to FIG. 1, a rotary drum type solid-liquid separation device is schematically shown. This solid-liquid separation device includes a processing tank 2, in which a partition wall 4 and a discharge weir 6 are provided.
Is divided by That is, the treatment tank 2 is a raw water tank 8,
It has a drainage tank 10 and a discharge tank 12.

A part of the partition wall 4 is formed by a seal plate 14, and the seal plate 14 has a communication port 16 in the center thereof. Inside the drainage tank 10, there is a hollow central shaft 1
The center shaft 18 extends from the drainage tank 10 into the raw water tank 8 through the communication port 16, and projects outside the raw water tank 8 in a liquid-tight manner. In other words, a part of the outer wall of the raw water tank 8 is formed by the closing plate 20, and the center shaft 18 penetrates the closing plate 20 in a liquid-tight manner and is supported by the closing plate 20.

One end of the central shaft 18 is open, and this opening is opened and closed by a seal disk 22 and closed. The central shaft 18 located in the raw water tank 8 is provided with a ventilation means, and the ventilation means has a ventilation pipe 24 extending upward from the central shaft 18. The lower end of the ventilation pipe 24 communicates with the center shaft 18 and the upper end is open.

In the drainage tank 10, a hollow filtration drum 26 is provided.
The filtration drum 26 is rotatably supported on the center shaft 18 via bearings 28 and 30 at both end surfaces. As is clear from FIG. 1, one bearing 28 projects toward the raw water tank 8 and the other bearing 30
Project toward the discharge weir 6. Note that the other end of the center shaft 18 is a closed end and is located inside the bearing 30.

The bearing 30 is supported by a support frame 32,
The support frame 32 extends in a direction crossing the drainage tank 10 as viewed in FIG. 1, and both ends thereof are fixed to the inner wall of the drainage tank 10. A ring gear 34 is attached to the outer periphery of one end of the filtration drum 26, and a drive gear 36 rotated by a motor (not shown) is meshed with the ring gear 34. Therefore, the filtration drum 26 is rotated in one direction by the driving of the motor.

Here, usually, the filtration drum 26 rotates integrally with the pair of bearings 28, 30.
However, it can be moved on the bearings 28 and 30 in the axial direction of the center shaft 18 as necessary. Filtration drum 26
Is provided with a grid-shaped frame, which is composed of a plurality of ring frames 38 arranged at predetermined intervals in the axial direction of the central shaft 18 and a large number of reinforcing ribs 40 connecting the ring frames 38. Consists of Each reinforcing rib 40
Are arranged at equal intervals in the circumferential direction of the ring frame 38.

A filter cloth 42 as a filter medium is adhered to the outside of the ring frame 38 and the reinforcing ribs 40, and the filter cloth 42 forms a peripheral surface of the filter drum 26. Here, as described in JP-A-58-207917 and JP-A-59-115720, the filter cloth 42 is formed by adding a single yarn to the weft in the width direction (axial direction of the central axis 18). A woven or knitted base material using synthetic fibers having a diameter of 0.1 μm to 10 μm is used, and the weft of the base material is directly brushed mainly in the longitudinal direction (the rotation direction of the filtration drum 26), and the thickness thereof is formed on the surface thereof. A nap filter layer (not shown) made of ultrafine fibers of 0.1 μm to 10 μm is formed.

Since the filter cloth 42 is raised in the longitudinal direction, the nap is lying in that direction. However, in use, the nap filter layer is inside the filter drum 26 and the nap is filtered. It is mounted so as to be opposite to the rotation direction of the drum 26. More specifically, the filter cloth 42 is attached to the reinforcing rib 40 as shown in FIGS. 2 and 3. FIG. 2 shows a connection structure between the intermediate region of the filter cloth 42 and the reinforcing ribs 40, and the filter cloth 42 and the reinforcing ribs 4.
0 are interconnected via a hook-and-loop fastener 44.
Here, one fastener sheet 44a of the hook-and-loop fastener 44
Are fixed directly to the reinforcing ribs 40, and the other fastener sheet 44b is fixed to the filter cloth 42 via a band 46 made of urethane resin.

FIG. 3 shows both ends of the filter cloth 42 and the reinforcing ribs 40.
2 shows a connection structure between the two. First, the end edges of the filter cloth 42 are connected to each other via a band 48 made of urethane resin, and, with respect to the reinforcing ribs 40, it is fixed via a holding band 50 and the mounting bolt 52. Here, the width of the band 48 is wider than the widths of the pressing band 50 and the reinforcing ribs 40, as is apparent from FIG.

As described above, if the intermediate region of the filter cloth 42 can be fixed to each reinforcing rib 40 via the hook-and-loop fastener 44, the filter cloth 42 can be easily mounted on the frame. Further, the fixing of the filter cloth 42 to the reinforcing ribs 40 is not limited to the use of the hook-and-loop fastener 44, and as shown in FIG.
4, and these may be fixed to the reinforcing ribs 40 via the holding band 56 and the mounting bolt 58. The width of the rubber sheet 54 is wider than the width of the reinforcing ribs 40 and the pressing bands 56, and both side edges thereof are bent in a direction away from the filter cloth 42.

When such a holding band 56 is used, since the filter cloth 42 is sandwiched between the pair of rubber sheets 54, the edges of the holding band 56 and the reinforcing ribs 40 are formed while the filter drum 26 is rotating. The filter cloth 42 does not bite into the filter cloth 42, and the life of the filter cloth 42 can be extended. FIG.
3 can be applied to the case of FIG.

On the other hand, for fixing the filter cloth 42 to the ring frame 38, a split type pressing bar 60 is used as shown in FIG. These holding bars 60 are attached to the ring frame 38.
The filter cloth 42 is sandwiched between the two and fixed to the ring frame 38 via mounting bolts (not shown). Filtration drum 26
, Ie, the end face 62 located on the partition wall 4 side
As is clear from FIG. 5, the central portion has an open structure, and the other end surface 64 has a closed structure.

One end face 62 of the filtration drum 26 and the partition wall 4
A ring seal 66 is disposed between the raw water tank 8 and the inside of the filtration drum 26, and the ring seal 66 is connected between the raw water tank 8 and the filtration drum 26.
A raw water introduction channel that guides raw water is formed inside. As shown in detail in FIG. 6, the ring seal 66 includes a mounting ring 68 protruding from the end face 62 of the filtration drum 26, and the mounting ring 68 includes an annular lip seal 70. Is fixed by a plurality of mounting bolts 72 and nuts 74. The tip side of the lip seal 70 is curved inward, and its tip end is
In contact with the seal plate 14 in a liquid-tight manner. The lip seal 70 may be fixed by a band (not shown).

As shown in FIG.
Inside, a backup spray 76 and a collection hopper 78 that covers the backup spray 76 from below are arranged. A backwash spray 80 is arranged outside the filtration drum 26, and the backwash spray 80 is
It is arranged so as to face the backup spray 76 with the filter cloth 42 interposed therebetween.

Each of the backup spray 76 and the backwash spray 80 comprises a pipe member extending in the axial direction of the filtration drum 26 and a number of nozzles attached to the pipe member at intervals in the longitudinal direction. , The backup spray 76 and the backwash spray 80 are designated by reference numerals 82 and 84, respectively. Here, as shown in FIG. 8, the injection axis of the nozzle 82 in the backup spray 76 is at a predetermined position downstream from the injection axis of the nozzle 84 of the backwash spray 80 in the rotation direction of the filtration drum 26. Preferably, it is offset by a distance (eg, about 5 mm).

The backup spray 76 is connected to the center shaft 18 via a pipe 86, and the pipe 86 is connected to one end of a pipe 90 via an internal passage 88 of the center shaft 18. The other end of the pipe 90 opens into filtered water of the drainage tank 10 described later, and a supply pump 94
Is inserted. This supply pump 94 is connected to the drainage tank 10,
That is, it is arranged outside the processing tank 2.

On the other hand, the backwash spray 80 is connected to one end of a pipe 96, and the other end of the pipe 96 also opens below the surface of the filtered water in the filtrate tank 10, and a supply pump 98 Is inserted. Further, another cleaning spray 100 is disposed in the filtration drum 26, and the cleaning spray 100 is located downstream of the collection hopper 78 when viewed in the rotation direction of the filtration drum 26 indicated by an arrow A in FIG. It is positioned in. The cleaning spray 100 has a large number of nozzles 102 attached to its pipe member, like the backup spray 76 and the backwash spray 80 described above, and is connected to a pipe 86 extending from the backup spray 76 via a branch pipe 104. ing.

On the discharge side of the supply pumps 94 and 98, Y-type strainers 170 and 171 are provided, respectively.
These strainers 170 and 171 are provided with nozzles 82 and 8 respectively.
Prevent clogging of 4,102. The strainers 170 and 171 may be arranged on the suction side of the supply pumps 94 and 98. A washing spray 106 is disposed outside the filtration drum 26, and the washing spray 106 also has a large number of nozzles 108 in its pipe member.
Is attached. The chemical spray 106 is connected to a chemical tank 112 via a pipe 110, and a supply pump 114 is inserted in the middle thereof. In the chemical liquid tank 112, a chemical liquid suitable for sterilizing the filter cloth 42 is stored. The chemical spray 106 is positioned downstream of the backwash spray 80 and in a region covered by the collection hopper 78 when viewed in the rotation direction of the filtration drum 26. The ejection of the chemical solution from each nozzle 108 of the chemical spray 106 is performed at a desired time or periodically.

The collection hopper 78 is fixed to the central shaft 18, while being connected to the central shaft 18 via a pipe 116. More specifically, the inside of the central shaft 18 is divided into two chambers 120 and 122 by a partition wall 118, and the pipe 1
16 is connected to one chamber 120. Further, the above-described internal passage 88 extends from the inside of the partition wall 118 to the other chamber 122.
, And is formed independently of the chamber 122.

A pipe 124 is connected to the chamber 120 of the central shaft 18.
That is, as shown in FIG. 1, it extends downward from the end protruding outside the raw water tank 8 and is connected to a collection tank (not shown). On the other hand, the other chamber 12 of the central shaft 18
2 is connected to a discharge pipe 126, which extends downward from the central shaft 18 as is apparent from FIGS.
6 is open near the inner surface.

Further, a discharge pipe 128 is connected to the other chamber 122 of the central shaft 18. The pipe 128 extends outside the drainage tank 10 and has a structure for draining water outside the solid-liquid separation device. A discharge pump 130 is inserted into the discharge pipe 128 at a position outside the drainage tank 10. The above-described discharge pipe 126, the chamber 122, the discharge pipe 128, and the discharge pump 130 constitute a discharge means of solid components accumulated in the filtration drum 26, and accordingly, the chamber 122
Is a discharge passage in the central shaft 18.

Next, the operation of the above-described solid-liquid separation device will be described. First, the filtration drum 26 is in a state of being rotated at a constant speed by the driving of a motor (not shown) through the meshing of the gears 34 and 36. In this state, as is clear from FIG. 1, the raw water supplied to the raw water tank 8 of the processing tank 2 passes through the raw water introduction path formed by the annular lip seal 66 and the opening of the one end face 62 of the filtration drum 26.
It is introduced into the filtration drum 26. Here, the filtration drum 2
6 is sealed with a lip seal 66 between the one end face 62 and the partition wall 4 and the other end face of the filtration drum 26 has a closed structure.
Will be stored inside.

However, the filter cloth 42 of the filter drum 26
Has a water permeability, the raw water introduced therein passes through the filter cloth 42 and flows out into the drainage tank 10.
More specifically, the raw water in the filtration drum 26 receives potential energy based on a water level difference H (see FIG. 7) between the water level of the filtration drum 26 and the water level of the filtration tank 10 determined by the discharge weir 6, and the raw water Only the liquid component passes through the filter cloth 42 and flows out to the drainage tank 10, and the solid component in the raw water is captured by the filter cloth 42. When the liquid level of the raw water stored in the drainage tank 10, that is, the filtered water, exceeds the discharge weir 6, the discharge water 12
And discharged out of the solid-liquid separator.

The solid components captured by the filter cloth 42 reach above the collection hopper 78 as the filter drum 26 rotates,
Then, the water is washed off by the filtered water jetted from each nozzle 84 of the backwash spray 80 and collected by the collection hopper 78. In other words, while the filtration drum 26 is rotating, the supply pump 98 is driven, and the supply pump 98 uses the filtered water sucked from the drainage tank 10 as the washing water to filter the water from each nozzle 84 of the backwash spray 80. It is ejected toward the cloth 42.

On the other hand, at this time, the supply pump 94 is also driven, and the supply pump 94 uses the filtered water in the drainage tank 10 as washing water through the pipe 90, the internal passage 88 of the central shaft 18, and the pipe 86. , Backup Spray 7
6 and jetted toward the filter cloth 42 from these nozzles 82. The pipe 86 is the pipe 1
Since the cleaning spray 100 is also connected to the cleaning spray 100, filtered water is also jetted from each nozzle 102 of the cleaning spray 100 toward the filter cloth 42.

When the filtered water is jetted from each nozzle 84 of the backwash spray 80, the jet pressure of the filtered water, together with the weight of the filter cloth 42, causes the filter cloth 42 to be loosened between the reinforcing ribs 40. Let me do it. However, the backup spray 76 is opposed to the backwash spray 80 with the filter cloth 42 interposed therebetween.
The filtered water jetted from 2 prevents the filter cloth 42 from loosening as shown in FIG.

[0035] Thus, the distance between the nozzles 84 of the backwash spray 80 and the filter cloth 42 which passes directly under the is kept uniform, injection output is filtered water from the backwash spray 80, the filter cloth 42 it is possible to impart certain injection out pressure against the outer surface, also put out injection from the backup spray 76 <br/> the filtered water is also constant injection unloading against the inner surface of the filter cloth 42 <br Pressure can be applied. Here, the nozzle 82 of the backup spray 76 and the nozzle 84 of the backwash spray 80
Since displaced from each other in the rotational direction of the filtration drum 26 as described above and filtration, the filtered water is exiting injection from the backup spray 76 to the filter cloth 42 is ejected from the backwashing spray 80 filter cloth 42 It does not counteract the impact of water.

[0036] from undergoing this manner the filter cloth 42 is the injection unloading of filtered water to both surfaces of the outer and inner surfaces at the same time, the filter cloth 4
Backwashing and surface washing is performed simultaneously for 2 further includes micro-vibration is caused in the filter cloth 42, caused a so-called hair kneading effect, and effectively washing away solid components captured on the filter cloth 42, the clogging Can be prevented. As a result, not only can reduce the ejection pressure and the ejection amount of filtered water required to backwash spray 80 and backup spray 76, the impact force filter cloth 42 is subjected also be alleviated by injection unloading of filtered water, filter cloth 42 can be greatly improved in durability.

In addition, as described above, as viewed in the rotation direction of the filtration drum 26, the filtered water is also jetted out from the nozzles 102 of the washing spray 100 located downstream of the collection hopper 78 toward the filter cloth 42. The filter cloth 42 is also washed with the filtered water. The solid components washed off from the filter cloth 42 are collected in the collection hopper 78, and the solid components are collected together with the filtered water from the collection hopper 78, through the pipe 116, the chamber 120 of the central shaft 18, and the pipe 124, and then to the collection tank. It is discharged toward.

The chambers of the central axis 18 from the collection hopper 7 8 120
When the solid component is discharged together with the filtered water through the filter, if the portion of the central shaft 18 on the side of the chamber 120 is formed of a pipe whose both ends are closed, the inside of the filtration drum 26 becomes a negative pressure as described above. There are cases. Further, when the clogging of the solid components in the piping 124 extending from the chamber 120 of the central shaft 18 is generated, becomes impossible the discharge of filtered water was issued injection from the backup spray 76, also in the chamber 120 is pressurized Become.

However, as described above, the center shaft 18
Since the ventilation pipe 24 extends upward from one end side, the inside of the chamber 120 of the central shaft 18 can be always in communication with the atmosphere. Therefore, even if the filtered water is discharged from the collection hopper 78 through the chamber 120 of the central shaft 18 due to the communication with the atmosphere, the inside of the filtration drum 26 is not exhausted, and the inside of the filtration drum 26 becomes negative pressure. It can be reliably prevented. As a result, the solid component captured by the filter cloth 42 does not peel off from the filter cloth 42 due to the negative pressure effect, and the solid component can be efficiently collected by the collection hopper 78 by washing the filter cloth 42, and the collection performance is stabilized. Can be maintained. Further, since the chamber 120 communicates with the atmosphere, the inside of the chamber 120 is not pressurized.

One end of the central shaft 18 is
Therefore, even if a solid component is clogged in the chamber 120 of the central shaft 18, if the seal disk 22 is removed, the cleaning brush can be opened from one end opening of the central shaft 18. And the clogging can be easily removed, and the inside of the chamber 120 can be cleaned at the same time.

The filtration of the raw water described above is repeated in a similar manner in a plurality of solid-liquid separation devices, whereby the solid-liquid in the raw water is separated to a desired level. If the solid-liquid separation device is used for a long time, solid components in the raw water may gradually accumulate on the bottom inside the filtration drum 26. Such accumulation of the fixed component promotes clogging of the filter cloth 42 and greatly reduces the filtration performance, and also increases the rotational resistance of the filtration drum 26.

When such a situation is reached, the drainage pump 13
0 is driven, and the drain pump 130
The solid components deposited on the bottom of the filtration drum 26 are sucked up together with raw water from the lower end opening of the
Through the chamber 122 and the discharge pipe 128 to the outside of the solid-liquid separator. As described above, if the solid components deposited on the bottom of the filtration drum 26 are periodically discharged together with the raw water,
The filter cloth 42 can be prevented from being clogged and its filtration performance can be stably maintained, and the rotational resistance of the filtration drum 26 does not increase.

The present invention is not limited to the above-described embodiment, and various modifications are possible. For example,
Referring to FIG. 9, a modified example of the central shaft 18 is shown. The central shaft 18 of this modification has a screw conveyor 164 in its chamber 120, and the screw conveyor 164 is connected to the pipe 1 from the lower end opening of the collection hopper 78.
It extends beyond the 24 openings. The shaft of the screw conveyor 164 projects from one end of the center shaft 18 and is connected to the electric motor 166.

When the screw conveyor 164 is rotated by the electric motor 166, the central hopper 1 is moved from the collection hopper 78.
The solid component flowing into the chamber 120 together with the filtered water is forcibly conveyed to the opening of the pipe 124 by the screw conveyor 164 and discharged through the pipe 124. When the screw conveyor 164 is used, the concentration of the solid component in the raw water is high, and the solid component introduced into the chamber 120 of the central shaft 18 cannot be flowed with only the filtered water, or the fixed component becomes a slurry together with the filtered water. Even in the case where they become, they can be reliably guided from the central shaft 18 toward the pipe 124.

The screw conveyor 164 can be used in combination with the above-described ventilation pipe 24. Instead of the screw conveyor 164, the partition wall 11 of the central shaft 18 can be used.
An air nozzle protruding toward the chamber 120 may be provided at 8, and compressed air may be ejected from the air nozzle into the chamber 120, and the solid component or slurry may be discharged by the flow of the compressed air.

Further, in the case of the above-described filtration drum 26, the raw water introduction path is a seal ring 66, ie,
Although the lip seal 70 is formed by the lip seal 70, the lip seal 70 is always in sliding contact with the seal plate 14 of the partition wall 4 during the rotation of the filtration drum 26, so that its wear cannot be avoided. For this reason, when using the solid-liquid separation device, it is necessary to replace the lip seal 70.

However, regarding this exchange work,
As described above, since the filtration drum 26 itself can move on the bearings 28 and 30 in the axial direction, if the filtration drum 26 is moved within the range indicated by L in FIG. A space can be secured between the lip seal 70 and the lip seal 70 can be replaced using this space. Therefore, it is not necessary to take out the entire filter drum 26 outside the processing tank 2 to replace the lip seal 70, and the lip seal 70 can be easily replaced.

The solid-liquid separation device of the present invention can be used for various applications. For example, it can be used for a solid-liquid separation device for lake water or river water. Also, sludge, scum, floc generated by sewage treatment, such as surplus sludge by-produced in an activated sludge treatment device, so-called suspended sludge discharged from a biofilm treatment device, and so-called fixed sludge. It can be used for filtration and concentration of washing water, sludge and the like. Furthermore, it can be used for solid-liquid separation in the production process of paper pulp, food, sake, miso, etc., and for recovery of valuables in chemical processes.

[0049]

As described above, in the rotary drum type solid-liquid separation device of the present invention, since the inside of the hollow center shaft of the filtration drum is communicated with the outside air by the ventilation pipe of the ventilation means, the recovery hopper is provided. Even if the collected washing water is discharged through the center shaft, the inside of the filtration drum is not exhausted and does not become negative pressure. Therefore, the solid components trapped in the filter medium of the filtration drum can be reliably collected in the collection hopper, and the collection performance can be stably maintained.

[Brief description of the drawings]

FIG. 1 is a schematic longitudinal sectional view showing a rotary drum type solid-liquid separation device of one embodiment.

FIG. 2 is a sectional view showing a connection of a filter cloth central portion to a reinforcing rib of the filter drum of FIG. 1;

FIG. 3 is a cross-sectional view showing connection of both ends of a filter cloth to a reinforcing rib.

FIG. 4 is a cross-sectional view showing another type of connection of the filter cloth central portion to the reinforcing rib.

FIG. 5 is a schematic perspective view showing a filtration drum.

FIG. 6 is a cross-sectional view showing a part of a ring seal between a filtration drum and a partition.

FIG. 7 is a diagram showing a supply system of filtered water to a backwash spray and a backup spray.

FIG. 8 is a diagram showing an operation of filtered water injected from a backup spray.

FIG. 9 is a sectional view showing a screw conveyor housed in a chamber of a central shaft.

[Explanation of symbols]

 2 Treatment tank 4 Partition wall 6 Discharge weir 8 Raw water tank 10 Filtration tank 12 Discharge tank 14 Seal plate 16 Communication port 18 Center shaft 20 Closing plate 22 Seal disk 24 Ventilation pipe 26 Filtration drum 28, 30 Bearing 32 Support frame 34 Ring gear 36 Drive gear Reference Signs List 38 ring frame 40 reinforcing rib 42 filter cloth (filter material) 44 surface fastener 46, 48 band 50, 56 holding band 52, 58 mounting bolt 54 rubber sheet 60 holding bar 62, 64 end face 66 ring seal 68 mounting ring 70 lip seal 72 mounting Bolt 74 Nut 76 Backup spray 78 Recovery hopper 80 Backwash spray 82, 84, 102, 108 Nozzle 86, 90, 96, 110, 116, 124 Piping 88 Internal passage 94, 98, 114 Supply pump 100 Cleaning spray 104岐配 pipe 112 liquid tank 118 partition walls 120, 122 chamber 126 discharging pipe 128 discharging pipe 130 discharging pump 170 and 171 Y-type strainer

────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-55-86511 (JP, A) JP-A-49-103264 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) B01D 33/06 B01D 33/76

Claims (1)

(57) [Claims] 1. A filter drum having a body fitted with a filter medium is rotatably supported on a hollow central shaft, and raw water introduced inside the filter drum is passed through the filter medium while rotating the filter drum. To separate the solid and liquid in the raw water, wash the solid components captured by the filter medium with washing water and collect them in a collecting hopper, and pass the collected solid components together with the washing water from the collecting hopper through the center shaft. In the solid-liquid separation device so as to be discharged out of the filtration drum, provided with ventilation means for communicating the inside of the central axis to the atmosphere ,
The venting means is located outside the filter drum.
Equipped with a ventilation pipe extending upward from the mandrel
And a rotary drum type solid-liquid separator, characterized in that are.