JP3053201B2 - Filter body with variable slit width mechanism and filtration device provided with the same - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD OF THE INVENTION

The present invention provides a method for separating a suspension stock solution containing filter cake particles such as sewer sludge, human waste treatment sludge, fishery processing wastewater, ranch wastewater, food factory wastewater, organic chemical industry wastewater into waste liquid and cake cake. The present invention relates to a filtration device and a solid-liquid separation device in a production process.

[0002]

[Prior art]

Conventionally, the method of separating suspended stock solution containing filter cake particles such as sewer sludge, human waste treatment sludge, fishery processing wastewater, ranch wastewater, food factory wastewater, organic chemical industry wastewater, etc. into waste liquid and cake, and solidification of production process As the liquid separation method, a centrifugal separation method, a pressure filtration method, a vacuum dehydration method, a belt press method, an electroosmosis method, a multiple disk method, and the applicant himself filed on March 3, 2001 (Japanese Patent Application No. No. 49898), a filtering device using a rotating belt-like filter has been employed.

[0003]

[Problems to be solved by the invention]

However, it is difficult or impossible to change the filtration surface in any of the above-mentioned various methods, and it is difficult to perform a filtration process according to the type of sludge to be filtered by the same filtration device.

The above-mentioned Japanese Patent Application No. 1-49 filed by one of the joint applicants of the present application
In the invention according to No. 898, by appropriately replacing the mounting member on which the filtering element is mounted, it is possible to expand and contract the slit between the filtering elements, to create a filtering surface of a different mode, but the mounting member is There are many in the rotating belt-shaped filter,
Since each of them is fastened with a screw or the like, there is a problem that replacement thereof requires a great deal of labor, time and cost.

Accordingly, the present invention is an improvement of the invention according to the above-mentioned Japanese Patent Application No. 1-49898, in which a filter (slit) between each filter element can be easily changed, and a filter provided with the filter. It is intended to provide a device.

[0006]

[Means for Solving the Problems]

In order to achieve the above object, the present invention pivotally supports one end of a plurality of filtering elements arranged in parallel with a gap therebetween, and mounts the other end of the filtering element on a mounting member. The filter body having a structure in which the support shaft and the mounting member are laterally connected to a frame member and fixed to the frame member so that both ends of the filter body are rotatably connected in a belt shape to form a ring. A plurality of notches having different pitches at which the respective filter elements are fitted are provided in the frame member, and the mounting member is supported by the frame member so as to be rotatable.

[0007] Further, in the filter device of the present invention, a plurality of the above-mentioned filter bodies are rotatably connected to each other, formed in a ring shape, and wound around a parallel rotating shaft interlocked with a driving means. In a filtration device provided with a band-shaped filter, a gravity dewatering unit, a pressure dewatering unit, and an electroosmotic dewatering unit are provided at a predetermined portion of the rotating band-shaped filter.

[0008]

[Action]

Since the mounting member pivotally supported on the frame member is provided with a plurality of rows of cuts having different pitches at which the respective filter elements are fitted, the mounting member is adapted to the type of the sludge stock solution. By changing the position of the filtration element rotatably supported by the support shaft while changing the rotation in accordance with the rotation, the gap between the filtration elements can be appropriately adjusted. As a result, different filtration surfaces are formed in the same apparatus, and the filtration surface can be changed very easily.

[0009] In a filtration device provided with a filter body that performs the above-described operation,
The gravity dewatering unit operates as the first stage of the sludge filtration process, the pressurized dewatering unit operates as the second stage, and the electroosmotic dewatering unit operates as the third stage.

[0010]

【Example】

Hereinafter, a filter according to the present invention and a filter provided with the filter will be described in detail based on examples. The filter 1 includes a number of filtration elements 11 and a support shaft on which the filtration elements 11 are pivotally supported.
12, a mounting member 13 on which the filter element 11 is mounted, and a frame member 14 on which the support shaft 12 and the mounting member 13 are mounted, and are formed in a "sawdust" shape.

As shown in FIG. 1, in this embodiment, the filtering element 11 is an elongated rod made of ceramic and formed into a regular triangular prism. A substantially U-shaped suspension part 111 for pivotally supporting the filtration element 11 on a support shaft 12 is formed integrally with a lower front part of the filtration element 11, and the suspension part includes a support shaft 12 to be described later. Is inserted. The shape of the suspension portion does not need to be limited to a substantially U-shape, and may be a circular hole, but is preferably a detachable shape.

The rear end of the filter element 11 is formed in an arc shape. The filtering element 11 is suspended on the support shaft 12 with the flat upper surface 113 facing upward and the ridge 114 facing downward. Further, a number of filtration elements 11 pivotally supported by the support shaft 12,
The flat upper surfaces 113 of adjacent filter elements 11 are juxtaposed so as to be flush with each other. In this embodiment, the filtering element 11
Has a flat surface, but is not necessarily limited to a flat surface, and may have a non-flat upper surface. Further, the material of the filter element 11 is not limited to ceramic, but may be any material having wear resistance and corrosion resistance, such as metal and synthetic resin.

The support shaft 12 is a rod-like body made of metal or the like having a circular cross section and having both ends fixed to the left and right frame members 14 with screws and suspended horizontally. A large number of filtration elements 11 are provided on the support shaft 12 with a specific slit (gap) by a mounting member as described later.
Are suspended and pivoted in parallel with a certain amount of play in a detachable manner. In this embodiment, the support shaft is disposed near the end of the filter element and is engaged with the filter. However, the support shaft may be disposed at the center of the filter element.

The mounting member 13 is a rod on which the filtering element 11 is mounted,
A large number of cuts 131 are provided on the surface to fit with the filtering element. Support shafts 132 project from both ends of the mounting member 13 and are supported by the left and right frame members 14 so as to be freely rotatable. In the example shown in FIG. 1, the mounting member 13 has a regular triangular prism shape, and cuts having different pitches are provided on three ridges (see FIG. 3 which is an enlarged perspective view). The cut 131 is a substantially V-shaped cut corresponding to the shape of the filter element, and a U-shaped groove 131a is provided at the base of the cut so that the filter element can be fitted easily and accurately. By fitting the ridge 114 and the slope 115 of the filtering element 11 into the cut 131, the filtering element 11 is held with a specific slit (gap) as described above.

By rotating the mounting member 13 and adjusting the position of each filter element to fit into the notch with the ridge line provided with cuts of different pitches facing up, the slit width between each filter element is changed. can do. This makes it possible to deal with solid-liquid separation of various types of suspension stock solutions.

The mounting member 13 is not limited to the above-mentioned shape, and may be formed by forming a plurality of rows of notches having different pitches on each surface of the polygonal prism as shown in FIG. Alternatively, a configuration in which a row of cuts is formed on the peripheral surface of the cylinder may be adopted.

Since the suspension stock and the cake are loaded on the filter element 11, the mounting member 13 also has a function of supporting the weight thereof. For this reason, as shown in FIG.
By providing the mounting member 13 not only near the rear end 112 of the 11 but also near the center or near the suspension of the filtration element, the function of supporting the weight of the suspension stock solution and the like can be further reinforced,
The slit width between the filtering elements can be more reliably kept parallel.

The frame member 14 is a rectangular elongated plate member on which the support shaft 12 and the mounting member 13 are horizontally and screwed. As shown in FIG. 1, holes 143 and 144 are formed in the lower left portion of the frame member 14 for rotatably connecting the frame members of other filter bodies.

A plurality of filter bodies having the above-described configuration are connected in series and wound in a ring shape on a parallel rotating shaft (cylinder) connected to the driving means, and the rotating body shown in FIG. This is a belt-shaped filter body 3. That is, the rotating shaft (cylinder) 31 is a cylindrical shaft, and is driven to rotate by driving means such as a motor (not shown). Further, as shown in FIG. 4 (2), the rotating shaft 31 has a frame member.
A groove 311 with which the 14 is engaged is formed.

The above-mentioned rotating belt-shaped filter body 3 is rotated in the direction of the arrow in FIG. 4A by the rotation of the rotating shaft (tube) 31, and each of the filtering elements is rotatably supported by the supporting shaft. Therefore, when it is moved to the lower part of the belt-shaped filter body 3 by rotation, it is in a state of hanging separately on the support shaft, and when it is moved to the upper part of the rotary belt-shaped filter body 3, it is in an aligned state.

The mounting member 13 of the filter element 1 constituting the rotary belt-shaped filter element 3 can be easily rotated and adjusted for each filter element, so that the mounting member for each filter element has a different pitch. In this case, as shown in FIG. 5, for example, filtration surfaces 51, 52, and 53 having different slit widths between the filtration elements for each filter body can be created.

FIG. 6 shows a filtration device provided with the above-mentioned filter element. The filtration device 4 includes a suspension stock solution inlet 42 and a filtrate outlet 43.
And a filter tank 41 having a cake discharge port 44, the above-described rotating belt-shaped filter body 3, and a filter element cleaning device as a cleaning means.
45, a brush schema 46 as a filter cake particle removing means,
A pressure belt 47 as pressure means and a filter element aligning roller 48 as means for aligning the filter elements are provided. In the embodiment shown in FIG. 5, the rotary belt-shaped filter body 3 is arranged to be inclined in order to promote gravity dehydration of the suspension stock solution, but it may be installed flat.

The filter element cleaning device 45 is disposed on the cake discharge port 44 side below the rotary belt-shaped filter body 3, and includes two rotary brushes 45.
1, 452, and a tank 453 for storing water or a chemical solution for cleaning the rotating brushes 451, 452. The flocked portions of the rotating brushes 451 and 452 are constantly immersed in the water or the chemical stored in the tank 453 while rotating. The rotating brush 451, 4
The 52 flocked portions are always impregnated with a chemical solution. The flocked portions of the rotating brushes 451 and 452 impregnated with water or a chemical solution are transferred to the lower side of the rotating belt-shaped filter body 3 and come into contact with the filtering element 11 in a state of being suspended on the support shaft 12 while rotating. Then, the filter cake adhering without being separated and removed by the vibration at the time of transfer from the upper side to the lower side of the rotary belt-shaped filter body 3 is scraped off. Thereby, the filtration element 11 is washed.

The brush schema 46 is disposed on the suspension stock solution inlet 42 side above the rotary belt-shaped filter body 3, and has two rotary shafts 461 and 462.
And a belt 463 wound around the rotating shafts 461 and 462. On the belt 463, a wire-like brush 464 is implanted. Further, the brushes 464 are implanted at regular intervals so that the tips of the brushes 464 protrude into slits (gap) between the filter elements 11. The speed of the belt 463 is set so that it rotates faster than the rotating belt-shaped filter body 3. Accordingly, the brush 464 of the belt 463 that has entered the slits (gap) between the filtration elements 11 rakes up the suspended undiluted solution while pressing it in the traveling direction, so that the filter residue particles clogged in the slits (gap) between the filtration elements 11 Is swept up and removed, and the surface (filtration surface) of the rotary belt-shaped filter body 3 is always maintained in a state where solid-liquid separation can be performed well.

The pressure belt 47 is disposed on the cake discharge port 44 side above the rotating belt-shaped filter body 3, and is wound around the two rotating shafts 471, 472 and the rotating shafts 471, 472. Belt 473 and a plurality of pressure rollers 474 provided inside the belt 473. By pressing the belt 473 onto the belt-shaped filter body 3 via a roller, the suspension stock solution gravity-dehydrated at the portion where the brush schema 46 is provided is further subjected to pressure dehydration. This further reduces the water content of the stock suspension.

In addition, if a mechanism is used in which a magnet is attached to the upper part of the pressure roller with the same kind of poles facing each other, and the roller is pressed against the filtration surface using the repulsive force of the magnetic force, the pressing force can be varied. And the peristaltic movement of the object to be dehydrated (a movement required to reduce the water content during dehydration, which has the effect of promoting the movement of the particle contacts because water is drained while trapped between the particles to be dehydrated) And can improve the dewatering efficiency. A similar effect can also be obtained by applying pressure to the pressure roller using a spring.

The filtration element aligning roller 48 is a cylindrical shaft disposed on the suspension stock solution inlet 42 above the rotary belt-shaped filter 3. Further, the filtering element alignment roller 48 has substantially the same length as the depth dimension of the rotating belt-shaped filter body 3, and is disposed in parallel with the rotation axis 31 of the rotating belt-shaped filter body 3. When the filter element 11 transported to the lower side of the rotary belt-shaped filter element 3 and hung on the support shaft 12 by the filter element aligning roller 48 is transported to the upper side of the rotary belt-shaped filter element 3, the filter element 11 The filter element aligning roller 48 hits and fits so as to align with the cut of the mounting member 13.
It is mounted.

In the above apparatus, a dehydration zone by an electroosmosis method can be added as a step following the dehydration step using a pressure belt. The dewatering by the electroosmosis method may be performed on the cake dewatered by the above device and discharged to the outside of the filtration tank. By using the electroosmosis method together, more complete dehydration can be performed.

Next, the filtering device 4 provided with the rotary filter according to the present invention
The operation of will be described.

The undiluted suspension 5 (including undiluted sol and gel solutions) introduced from the undiluted suspension inlet 42 is loaded on the rotary belt-shaped filter 3. The loaded undiluted suspension 5 is gravity-dehydrated while being transported in the direction of the cake outlet 44 by the rotating belt-shaped filter body 3, and the water in the undiluted suspension 5 drops from the slit between the filtration elements 11 to the bottom of the filtration tank 41. I do. At this time, brush schema 46
Is operating, so the slit (gap) between the filtration elements 11
The filter cake particles clogged up are removed by being scraped up, and the suspension stock solution 5 is satisfactorily dewatered by gravity. The suspension stock solution 5 subjected to gravity dehydration is further transported in the direction of the cake outlet 44 and dehydrated under pressure by the pressure belt 47 to form a cake. The cake is carried out of the cake outlet 44 to the outside of the filtration tank 41.
The filter body 1 from which the cake has been discharged is transferred to the lower side of the rotary belt-shaped filter body 3. The filter element 11 of the filter body 1 transferred to the lower side rotates around the support shaft 12, and is suspended in the support shaft 12, and the filter element cleaning device 45 cleans the filter element 11. Further, when the filter element 1 is transported upward, the filter element 11 hanging on the support shaft 12
Are fitted, mounted and aligned on the mounting member 13 again by the filtering element alignment roller 48, and function as a filter.

[0031] The rotating belt-shaped filter provided in the filtration tank may be a single body, or a plurality of bodies may be arranged in tandem.

[0032]

【The invention's effect】

As described in detail above, the filter body according to the present invention easily changes the width of the slit between the filtration elements by adjusting the rotation of the mounting member and adjusting the position of each filtration element on the support shaft. Therefore, it is possible to perform filtration of various types of sludge stock by the same filtration device.

In addition, the filtering device provided with the filter body having the above-described effect performs the dehydration process sequentially in the order of the gravity dehydration unit, the pressure dehydration unit, and the electroosmotic dehydration unit, so that a complete dehydration process can be performed. There are advantages.

[Brief description of the drawings]

FIG. 1 is an exploded perspective view of a filter according to the present invention.

FIG. 2 is an enlarged perspective view of a mounting member in FIG. 1;

FIG. 3 is a perspective view showing a mounting member of another shape.

FIG. 4 is a perspective view and a partially enlarged cross-sectional view showing a rotary belt-shaped filter.

FIG. 5 is a plan view showing a filtration surface of a rotary belt-shaped filter body in which a slit between filtration elements differs according to each filter body.

FIG. 6 is a schematic view of a filtration device provided with a rotating belt-shaped filter.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Filter body 3 ... Rotating belt-shaped filter body 4 ... Filtration apparatus 5 ... Undiluted suspension liquid 11 ... Filtration element 12 ... Support shaft 13 ... Mounting member 14 ... Frame member 41 ... Filtration tank 42 …… Injection port of undiluted suspension 43 ……………………………………………………………………………………………………………………………………………………………………………………………………………………… .Ed. Pressing means) 48 ... Filtering element alignment roller (Filtering element alignment means)

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI B01D 35/06 B01D 35/06 G 61/56 33/36 B30B 9/24 C02F 11/12 (72) Inventor Atsutoshi Yonahara Tokyo 2-14-3 Mejirodai, Bunkyo-ku (56) References Patent 2808297 (JP, B2) (58) Fields investigated (Int. Cl. ⁷ , DB name) B01D 33/04

Claims (2)

(57) [Claims] An end of a plurality of filtering elements arranged in parallel with a gap therebetween is pivotally supported on a support shaft, and the other end of the filtering elements is mounted on a mounting member. In the filter body having a configuration in which the shaft and the mounting member are laterally connected to the frame member and fastened to each other to form a ring by connecting both ends of the filter body in a rotatable manner, each of the filtering elements is attached to the mounting member. A filter body having a variable slit width mechanism, wherein a plurality of rows of cuts having different fitting pitches are provided, and the mounting member is supported by the frame member so as to be rotatable. 2. A rotating belt-shaped filter having a structure in which a plurality of filters according to claim 1 are rotatably connected to each other and formed in a ring shape and wound around a parallel rotating shaft interlocked with a driving means. A filtering device provided with a gravity dewatering unit, a pressure dewatering unit, and an electroosmotic dewatering unit at a predetermined portion of the rotary belt-shaped filter body.