JPH10277324A - Simple filter - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enable filtration of an object to be treated with low slurry concentration and liquid state efficiently without using a vacuum pump by a method wherein a lower part is surrounded by a collecting tank, a surface of a cylindrical rotary drum with a number of small holes bored is wound by filter cloth, and the object to be treated is filtered by the filter cloth by a water head difference to be taken up as clarified water. SOLUTION: A lower part of a rotary drum 5 whose surface is wound by filter cloth 3 is surrounded by a collecting tank 8. The back of the collecting tank 8 connected with an object to be treated-feeding part 9 and the front of the collecting tank 8 is connected with a drainage passage 17. The rotary drum 5 has a cylinder state whose whole surface thin part has a number of small hole bored and the right and left hollow drum shafts 14 penetrating the center parts of the both side walls are rotatably supported on the both side faces of the collecting tank 8. The clarified water inside the rotary drum 5 filled by the rotary drum 5 by a water head difference can be discharged out the rotary drum 5 from the hollow parts of the drum shafts 14. A pray nozzle 7 is provided for ejecting washing water toward the surface of the filter cloth 3 of the upper part of the rotary drum 5 above a level L1 of the object to be treated inside the collecting tank 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a simple filter for a liquid to be treated having a relatively good filtering property and a low slurry concentration.

[0002]

2. Description of the Related Art A vacuum drum filter that separates the inside of a rotary drum having a filter cloth on its outer periphery into suction, dehydration, and peeling zones for filtering a liquid material to be treated such as sludge, and suctions the vacuum drum with a vacuum pump. Used. Also, Tokubiko 6
Japanese Patent Application Publication No. 0-51368 discloses a recovery device that immerses a filter using a rotary drum having a filter cloth mounted on the outer periphery of a liquid to be treated, and discharges clear water from the inside of the rotary drum by a pump. .

[0003]

The vacuum drum filter is widely used as a filter having a relatively simple structure. However, the rotary drum must have a zoned structure and a vacuum pump must be separately provided. Therefore, equipment costs and space were required. Further, the one disclosed in Japanese Patent Publication No. 51368/1985 has a problem that the solid content adhering to the filter cloth cannot be completely removed even if back washing is performed because the liquid pressure is constantly applied to the filter cloth. Was. INDUSTRIAL APPLICABILITY The present invention filters and clarifies a liquid to-be-treated with a simple structure and a low slurry concentration, does not require a vacuum pump, reduces equipment costs, saves space and energy, and contributes to effective use of water resources. It is an object of the present invention to obtain a filter capable of performing the filtration.

[0004]

In order to achieve the above object, according to the first aspect of the present invention, a small number of small holes are formed in a thin portion of the surface, the lower portion being surrounded by a collecting tank, and a filter cloth is wound on the surface. A cylindrical rotary drum being rotated, left and right drum shafts which are horizontally penetrated through the center of both side walls of the rotary drum and both ends of which are rotatably supported by bearings and one of which is connected to a drive unit, and which is connected to the collection tank; And a drainage channel having a weir plate. At least one of the drum shafts communicates with a conduit at an outer end through a hollow portion from an inner end surface, and is collected in the recovery tank by the weir plate. The problem was solved by a simple filter that allowed the object to be treated to be filtered through the filter cloth to make clear water and discharged through the conduit due to a head difference caused by a level difference between the treated object and the clarified water in the rotating drum. Claim 2
According to the invention, in place of the drive unit, a filter cloth is wound between a guide roller disposed in parallel with the drum shaft and the surface of the rotating drum, and the filter cloth is driven by the guide roller. Further, it is possible to provide the simple filter according to claim 1 in which the rotary drum is rotatable. According to the invention of claim 3, the weir plate is divided into a plurality of sheets that can be stacked between a pair of U-shaped weir plate support portions that are fixed to the landing provided in the drainage channel with the opening side opposed. The simple filter according to claim 1 or 2, wherein the head difference can be adjusted by selecting the number of layers. According to the fourth aspect of the present invention, a fluid supply pipe having a cleaning fluid source connected to a terminal is inserted into the rotary drum from the outer end side of the hollow portion of the drum shaft, and a position near the inner surface of the thin surface portion of the rotary drum is provided. The nozzle according to any one of claims 1 to 3, wherein a plurality of backwash nozzles each having an opening directed toward a small hole of the rotary drum are provided at intervals in a nozzle pipe connected to the fluid supply pipe. Can be obtained as a simple filter. According to the invention of claim 5, a drum shaft having a single hollow portion penetrates the rotary drum instead of the left and right drum shafts,
A number of liquid drain holes communicating with the hollow portion are formed in the rotary drum inner portion of the drum shaft, and a conduit is communicated with at least one outer end of the drum shaft, and the liquid drain hole for clear water is provided.
The simple filter according to any one of claims 1 to 3, which can be discharged through a hollow portion and a conduit. In the invention of claim 6, a spray nozzle having a washing water supply source is provided at a terminal toward the filter cloth above the level of the material to be treated in the recovery tank. Can be obtained. According to the invention of claim 7, the simple filter according to any one of claims 1 to 5, wherein a metal net is used instead of the filter cloth.

[0005]

Embodiments of the present invention will be described in detail below with reference to the drawings. FIG. 1 is a (a) schematic XX sectional view of one example of the simple filter of the present invention, (b) a schematic sectional view of another example, and (c) a schematic perspective view of a drainage channel. FIG. 2 is (a) a front sectional view of an example of the main part of the simple filter of FIG. 1, (b) a front sectional view of another example, and (c) a partial schematic surface view of a rotating drum. In the following simple filter, the supply side of the object to be processed will be described later, and the overflow discharge side after filtration will be described as the front side.

In FIG. 1A, a simple filter 1 includes a rotating drum 5 having a filter cloth 3 wound on a surface thereof, a collecting tank 8 surrounding a lower portion of the rotating drum 5, and a rear part of the collecting tank 8. It has a connected processing material supply unit 9 and a drainage channel 17 connected to the front part. The rotating drum 5 is also referred to in FIG.
A cylindrical shape in which a large number of circular small holes 16 are formed in the surface thin portion in the range of the width C over the entire surface.
At both sides of the rotating drum 5,
The hollow left and right drum shafts 13 and 14 are horizontally penetrated through the center of the shaft 15, and the drum shafts 13 and 14 can be prevented from leaking water by gland seals 11 and 11 fixed to both side surfaces of the recovery tank 8, and are disposed at both ends. The drum shaft 13 is rotatably supported by bearings 12 provided therein.
3a, the other drum shaft 14 is opened at the inner end face thereof, and the clarified water in the rotary drum 5 is passed through the conduit 24 connected to the outer end of the drum shaft 14 from the hollow end of the drum shaft 14 via a receiver to the outside of the rotary drum 5. It is possible to discharge. One drum shaft 1
For example, a motor as a drive unit 32 is connected to the outer end of the motor 3 in a rotatable manner in a drum rotation direction N (clockwise in FIG. 1). The conduit 24 may be connected to the drum shaft 14 via a rotary joint without using a receiver. A filter cloth 3 having a width equal to or greater than the width C in which the small holes 16 are formed is wound around the surface of the rotating drum 5. The treated material supply unit 9 is connected to the rear part of the collection tank 8 so that the treatment object S can be introduced into the collection tank 8.
The object S may flow down from above. The drum shaft 13 may be formed in a cylindrical shape instead of the hollow structure. As a desirable component, a spray nozzle connected to a header 6 having a washing water supply terminal at a terminal toward a surface of the filter cloth 3 above the rotary drum 5 above the object level L ₁ L ₁ in the recovery tank 8. 7 are provided.

1 (b) and 2 (b), a simple filter 2 will be described. The same components as those of the simple filter 1 are denoted by the same reference numerals, and detailed description thereof will be omitted. The simple filter 2
A rotary drum 5 having a filter cloth 4 wound around a large part of the surface, a collecting tank 8 surrounding most of the rotary drum 5, a processing material supply part 9 connected to the rear part of the collecting tank 8, and a front part connected to the processing part supply part 9 The drainage channel 17 is provided. The filter cloth 4 is guided by a guide roller 10 provided above the rotary drum 5 in parallel with the drum shafts 13 and 14.
Is guided and wrapped around a large portion (usually about ／ or more) below the thin peripheral portion of the surface of the rotary drum 5, and is rotated by driving by the guide roller 10 to rotate the filter cloth 4.
Rotating drum 5 in drum rotation direction N (clockwise in FIG. 1)
It is possible to rotate. The rotary drum 5 is surrounded by the collection tank 8 except for the upper part with a space therebetween, and has hollow left and right drum shafts 13, 1, centered on both side walls 15, 15 of the rotary drum 5.
4 is penetrated horizontally, the drum shafts 13 and 14 have both inner end faces opened, and the clarified water in the rotary drum 5 is supplied to the drum shafts 13 and 1.
4 can be discharged to the outside of the rotary drum 5 through a conduit (not shown) connected to the outer end from the hollow portion. As a desirable component, in addition to the header 6 and the spray nozzle 7 described above, toward the back surface of the filter cloth 4 above the rotating drum 5,
A spray nozzle 31 connected to a header 30 having a cleaning water supply at the terminal is provided. As a desirable component, a fluid supply pipe 28 to which a cleaning fluid source is connected to a terminal from the outer end side of the hollow portion of the drum shaft 14 is inserted into the rotary drum 5, and the rotary drum 5 is inserted from the drum shaft 14 via a header 27. Nozzle pipe 26 is continuously provided along the longitudinal direction at the position near the inner surface of the thin portion of the surface 5, and a cleaning nozzle 29 for backwashing with the front end opening side facing the small hole 16 of the rotary drum 5 at an interval from the nozzle pipe 26. Are provided in plurality. Here, water or air can be usually used as the cleaning fluid. This configuration can also be used in the simple filter 1.

In the simple filtration machines 1 and 2, a metal mesh may be used in place of the filter cloths 3 and 4, and the driving unit 32 uses a rotating shaft of another device to drive a belt or a chain instead of a motor. It may be. The small hole 16 of the rotary drum 5 is not necessarily limited to a circular shape, but may be a polygon, an ellipse or a combination thereof, a slit shape, a grid shape, or the like. What is necessary is just to be able to transmit without. The drum shaft 13 in FIG. 2B is different from that in FIG. 2A and, like the drum shaft 14, can be connected to a conduit connected from the hollow portion to the outer end without sealing the inner end surface with the lid 13a. However, this is preferably preferred for large rotating drums. Further, although not shown, a drum shaft having a single hollow portion penetrates the rotary drum instead of the left and right drum shafts 13 and 14, and a number of liquid drain holes communicating with the hollow portion are formed in the rotary drum inner portion of the drum shaft. A perforated pipe may be connected to at least one outer end of the drum shaft so that the clarified water can be discharged through the drain hole, the hollow portion, and the conduit.

A drain 17 is connected to the simple filters 1 and 2 in front of the recovery tank 8. The drainage channel 17 communicates with an opening 18 at the lower bottom of the collection tank 8, and extends from the outer surface of the collection tank 8 at intervals from the outer surface of the collection tank 8 to the same level as the axis of the drum shafts 13 and 14, Drum shaft 1 on the front of the partition plate 19
A box-shaped landing 20 having a bottom surface approximately at the same level as the axes of the axes 3 and 14; a drain duct 23 having an entrance connected to the lower opening of the landing 20 and extending to a lower exit; And a pair of weir plate support portions 22, 22 having a U-shaped cross-section, which are fixed to the boundary portions of the openings so as to face each other on the opening side.
It has a plurality of stackable weir plates 21 having a detachable width between 2 and 22. Level at the time of loading into the sheathing board support portion 22 of the sheathing board 21 and the sheathing board height H _1, by appropriately selecting the insertion number of the sheathing board support portion 22 in accordance with the dehydrating operation conditions of the object to be treated S Although there is a tunable, if operating conditions less fluctuation of the object to be treated S may weirs height H ₁ as configured for securing the one plate-like body. Here, in the collection tank 8,
A liquid drain valve 25 may be provided at the lower bottom near the opening 18 in preparation for the sedimentable slurry. In this case, it is desirable that the lower bottom of the recovery tank 8 be inclined downward.

Next, the operation of the simple filter 1 will be described. The liquid processing target S is supplied from the processing target supply unit 9 to the recovery tank 8.
The clarified water that has been introduced up to the level L ₁ L ₁ and passed through the small holes 16 on the surface of the rotating drum 5 after being filtered by the filter cloth 3 accumulates inside the cylinder of the rotating drum 5. the clarified water since the inner end face is open from the hollow portion of the drum shaft 14 is discharged through conduit 24 to the rotary drum 5 outer, clarified water in the drum 5 is level L ₁ L ₁ to a lower level L ₂ L ₂ is Stay at level L ₁ L ₁ and L
_The head difference H _2, which is the difference between ₂ L ₂ , acts as a filtration pressure on the filter cloth 3 of the object in the collection tank 8. Here, the rotary drum 5 is rotating in the drum rotation direction N. The clarified water discharged to the outside of the rotary drum 5 is used after being stored in, for example, a tank (not shown). On the other hand, the mixture of the object to be treated and the filtrate in the recovery tank 8 is concentrated by solid-liquid separation by the filter cloth 3, and then passes through the lower bottom opening 18 of the recovery tank 8 along the partition 19 of the drainage channel 17. The landing 20 over the upper surface of the dam 21
And is discharged from the drain duct 23 to the outside of the machine. Dam 2
In the case of using in a 1 laminating a plurality adjusts the sheathing board 21 number, the sheathing board in height H ₁ can easily change, adjustable water head difference of H ₂ recovery vessel 8 by the regulation is there. That is, as water head difference H ₂ described above, since corresponding to the filtering pressure simple filtration apparatus 1, it is possible to obtain the necessary refining water by adjusting while monitoring the clogging of the filter cloth 3. Since solids such as sludge are attached to the surface of the filter cloth 3 that has passed through the rotating drum 5 by a filtering action, washing is performed with a washing fluid from the spray nozzle 7, but the attached matter has a weak adhesive force. Therefore, cleaning can be performed relatively easily.

Next, the operation of the simple filter 2 will be described. The back surface of the filter cloth 4 that has passed through the rotating drum 5 is cleaned by the cleaning fluid from the spray nozzle 31. Further, when the simple filter 2 is operated for a long time, the lower surface of the filter cloth 4 and the small holes 1 are removed.
The cleaning fluid is sent from the outside of the hollow portion of the drum shaft 14 through the fluid supply pipe 28 in order to positively remove the deposits on the drum 6, and the cleaning fluid is sent from the backwash nozzle 29 from the position near the inner surface of the thin portion of the rotating drum 5. The small holes 16 and the filter cloth 4 can be washed by injecting the cleaning fluid toward the small holes 16 in the direction opposite to the filtering direction. The fluid here may be supplied continuously or intermittently, and the filter cloth 4 can be kept in a clean state by washing with the washing fluid from the backwash nozzle 29. At this time, the cleaning efficiency is highest when the rotary drum 5 and the filter cloth 4 are overlapped with each other and the cleaning fluid is above the water level L ₁ L _{1 of the} waste water. The clarified water is discharged to the outside of the rotary drum 5 through conduits connected to the outer ends of the hollow portions of the left and right drum shafts 13 and 14. Except for the above, the operation is the same as that of the simple filter 1, and therefore the description is omitted.

[0012]

【Example】

[Example 1] Using the simple filter 1 of the present invention, whose main dimensions were a rotating drum diameter of 500 mm, a filter cloth width of 500 mm, a small hole diameter of 13 mm, an opening ratio of 50%, and a weir plate height of 60 mm,
5.25 m ³ / h of a mixed solution of 280 ppm SS concentration of filtered water of sewage digested sludge and filter cloth washing water of a belt press dehydrator
5.7, which was combined with 0.5 m ³ / h of drum filter cloth washing water.
The 5 m ³ / h liquid material to be treated was filtered with a filter cloth having a peripheral speed of 5 m / min to obtain 4 m ³ / h clear water having an SS concentration of 50 ppm. At this time, overflow water from the weir plate and 1.75 m ³ / h of drainage from the liquid drain valve were treated as drainage.

[Embodiment 2] The same simple filter 1 as in Embodiment 1
4.85 of factory wastewater with SS concentration of 200 ppm
m ³ / h and filter cloth washing water 1.0 m ³ / h together with a filter cloth having a peripheral speed of 1.5 m / min.
m ³ / h of clear water was obtained. At this time, drainage is 1.85m
³ / h. Then, the peripheral speed of the filter cloth was increased to 3.0 m / min to obtain 5.4 m ³ / h of clear water, but the SS concentration was almost the same as when the peripheral speed was 1.5 m / min. .

[Embodiment 3] The same simple filter 1 as in Embodiment 1
Was used to filter the circulating water during the production of tofu, and the raw water having an SS concentration of 40 ppm was filtered, whereby 96% of SS7 ppm clear water could be recovered. As is clear from these examples, according to the simple filter of the present invention, the liquid to-be-processed having a relatively high filterability and a low slurry concentration, for example,
Filtration water such as a belt press dehydrator, filter cloth washing water, river / lake water, and clean dirt factory drainage can be filtered and clarified.
The obtained clear water can be used as, for example, filter cloth washing water for a belt press dehydrator, vacuum filter, etc., cooling water for various devices, water for general use, and the like.

[0015]

According to the simple filter of the present invention, it is suitable for filtering and clarifying a liquid to-be-processed having a low slurry concentration with a simple structure, does not require a vacuum pump, and reduces equipment costs. It is a large project that contributes to effective use of water resources by saving space and energy. Furthermore, the head difference of the recovery tank can be adjusted by adjusting the height of the weir plate, and the required amount of clarified water can be obtained while monitoring the clogged state of the filter cloth.

[Brief description of the drawings]

FIG. 1 is a schematic XX of (a) an example of the simple filter of the present invention.
It is sectional drawing, (b) Schematic sectional drawing of another example, (c) Drainage schematic perspective view.

FIG. 2 is (a) a front sectional view of one example of a main part of the simple filter of FIG. 1, (b) a front sectional view of another example, and (c) a partial schematic surface view of a rotating drum.

[Explanation of symbols]

1, 2 Simple filter 3, 4 Filter cloth 5 Rotary drum 6, 27, 30 Header 7, 31 Spray nozzle 8 Recovery tank 9 Processed material supply unit 10 Guide roller 11 Ground seal 12 Bearing 13, 14 Drum shaft 15 Side wall 16 Small hole 17 drainage channel 18 opening 19 partition 20 landings 21 sheathing board 22 sheathing board support portion 23 drainage duct 24 conduit 25 liquid vent valve 26 nozzle pipe 27 header 28 fluid supply pipe 29 backwashing nozzle 32 driver C width H ₁ dam Height H ₂ Head difference L ₁ , L ₂ level N Drum rotation direction S Workpiece

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification symbol FI B01D 33/44 24/38 33/70 (72) Inventor Kazuo Okamoto 2-17-15 Tsukushima, Chuo-ku, Tokyo Tsukishima Kikai Co., Ltd. (72) Inventor Hiroshi Sano 2-17-15 Tsukuda, Chuo-ku, Tokyo Tsukishima Machinery Co., Ltd.

Claims (7)

[Claims] 1. A cylindrical rotary drum having a lower portion surrounded by a collection tank, a number of small holes formed in a thin surface portion, and a filter cloth wound on the surface, and a horizontal portion at the center of both side walls of the rotary drum. A left and right drum shaft, both ends of which are rotatably supported by bearings and one end of which is connected to a drive unit, and a drainage passage having a processing material supply unit and a weir plate connected to the recovery tank, wherein the drum shaft At least one of which is communicated with a conduit at an outer end through a hollow portion from an inner end face, and the head difference caused by a level difference between an object to be treated collected in the recovery tank by the weir plate and a clarified water in the rotary drum, A simple filter wherein an object to be treated is filtered through the filter cloth to make clear water and can be discharged through the conduit. 2. A filter cloth is wound between a guide roller disposed in parallel with a drum shaft and a surface of a rotating drum instead of a driving unit, and the filter cloth and the rotation are rotated by the guide roller. The simple filter according to claim 1, wherein the drum is rotatable. 3. A dam plate is divided into a plurality of stacking members that can be stacked between a pair of U-shaped cross-section dam supporting portions fixed on the opening side to a landing provided in a drainage channel and facing the opening side. 3. The head difference can be adjusted by means of the head.
3. The simple filter according to item 1. 4. A fluid supply pipe having a cleaning fluid source connected to an end of the rotary drum from the outer end side of the hollow portion of the drum shaft is inserted into the rotary drum, and the fluid supply pipe is provided at a position close to the inner surface of the thin portion of the surface of the rotary drum. A plurality of backwash nozzles, each having an opening directed toward a small hole of the rotary drum, are provided at intervals in a nozzle pipe connected to the nozzle pipe. Simple filter machine. 5. A drum shaft having one hollow portion instead of the left and right drum shafts penetrates the rotary drum, and a number of liquid drain holes are formed in the inner portion of the rotary drum of the drum shaft so as to communicate with the hollow portions. The simple filtration according to any one of claims 1 to 3, wherein a conduit is connected to at least one outer end of the drum shaft, and clarified water can be discharged through the drain hole, the hollow portion, and the conduit. Machine. 6. The spray nozzle according to claim 1, wherein a spray nozzle having a cleaning water supply source is provided at a terminal toward a filter cloth above a level of an object to be treated in the recovery tank. 3. The simple filter according to item 1. 7. The simple filter according to claim 1, wherein a metal mesh is used instead of the filter cloth.