JPH0696081B2 - Rotating drum type solid-liquid separator - Google Patents

Description

TECHNICAL FIELD The present invention is used for solid-liquid separation of lake water, river water, etc.,
Excess sludge by-produced in the activated sludge treatment device, so-called suspended sludge and discharged from the biofilm treatment device,
It is used for filtering and concentrating sludge, scum, flocs, washing water, sludge, etc. generated by wastewater treatment such as so-called fixed sludge, paper pulp, food, liquor,
The present invention relates to a rotary drum type solid-liquid separation device that can be used for solid-liquid separation in the manufacturing process of miso or the like, or can be used for recovery of valuable materials in a chemical process.

2. Description of the Related Art For example, U.S. Pat. No. 4,038,187 and JP-A-49-8 are known.
0664, JP-A-55-86511, JP-A-61-35886
As described in Japanese Patent Publication, a filter drum having a filter body attached to a body is arranged in a filter tank, and while the filter drum is rotated in one direction, raw water is introduced into the filter drum to remove the filter material. The solid-liquid separation device that allows the solid components in the raw water to be trapped and separated and the filtered water to flow out into the filtration tank is generally called a rotating drum type solid-liquid separation device and widely used in various fields. Has been done.

In such a rotary drum type solid-liquid separation device, the solid component trapped in the filter medium is washed off by the recovered water sprayed from the recovery spray provided on the outside of the filtration drum, and the recovery component provided on the inside of the filtration drum. Collected in hoppers,
It is discharged outside the system. The filter medium is washed with washing water sprayed from a washing spray provided on the downstream side of the recovery spray in the rotation direction of the filtration drum and outside the filtration drum, and then subjected to solid-liquid separation again.

Further, since the raw water passes through the filter medium by utilizing the liquid level difference between the inside and outside of the filtration drum, a force corresponding to this liquid level difference is applied to the filter medium. The collected water that is sprayed when collecting solid components,
It is also affected by the cleaning water sprayed during cleaning.
Therefore, the filter media must be able to withstand these forces.

By the way, as a filter material, a wire mesh or a so-called flocked filter cloth, which is obtained by flocking fine fibers on the surface of a woven fabric to form a napped filter layer, is often used. However, although the wire mesh has no problem in strength, it is inferior in the ability to separate solid components because it cannot make the eyes so fine. The flocked filter cloth can capture and separate finer solid components as compared with the wire mesh, but the density of the napped hair cannot be so high depending on the flocking, and thus the separating ability is still insufficient. Moreover, since the density of the napped hair cannot be so high, fine solid components easily bite between the napped hairs, and if it bites, not only the recovery efficiency of the solid components decreases, but also high-pressure recovered water becomes necessary, which makes the filter cloth The damage will be severe and the separation ability will be reduced prematurely, requiring frequent replacement of the filter cloth.

The object of the present invention is to solve the above-mentioned problems of the conventional device, excellent solid-liquid separation ability and easy and efficient recovery of the solid components trapped in the filter medium. Moreover, it is an object of the present invention to provide a rotary drum type solid-liquid separation device in which the filter medium is less damaged and the replacement frequency is low.

Means for Solving the Problems In order to achieve the above-mentioned object, the present invention provides a body including a plurality of annular stays that are parallel to each other and a plurality of reinforcing ribs that connect the annular stays to each other. ,
A filter cloth having a filter layer formed by raising fibers obtained by raising the cloth on the surface of the cloth is mounted so that the filter layer is on the inside of the body, and the filter drum is arranged in the filter tank. The raw water was introduced into the inside of the filtration drum while rotating in one direction, and the solid component in the raw water was captured and separated by passing through the filter cloth, and the filtered water was allowed to flow into the filtration tank. A solid-liquid separator, a. A recovery spray is provided on the outer side of the filtration drum so as to face the filter cloth and wash off solid components captured by the filter cloth. B. A collection hopper for collecting the solid components washed off from the filter cloth is provided inside the drum opposite to the collection spray, and c. Inside the filtration drum and of the filtration drum. In the direction of rotation And, on the downstream side of the recovery hopper, facing the filter cloth, a cleaning spray for cleaning the filter cloth is provided, and d. The filter cloth has an elongation Ts defined by the following formula. A rotating drum type solid-liquid separation device is provided, which is at least 1.0%.

In the above, preferably, the woven fabric is a satin woven fabric in which spun yarn or multifilament yarn of polyester fiber having a thickness of 0.1 to 10 μm is used as a weft yarn, and synthetic fiber yarn is used as a warp yarn, and the weft yarn of the woven fabric is mainly raised on the surface. Got 0.1
A filter layer is formed by naps of about 10 μm.

Further, a plurality of recovery sprays may be provided in the rotation direction of the filtration drum, and a recovery hopper may be provided corresponding to each of the recovery sprays.

Furthermore, it is preferable that a pipe having one end opening into the filtered water in the filtration tank is connected to the other end of the recovery spray and the cleaning spray.

Furthermore, it is also preferable that a chemical washing spray for washing the filter cloth with a chemical is provided on the outer side of the filtration drum, facing the recovery hopper.

The raw water is introduced into the inside of the filtration drum while rotating the filtration drum in one direction, and the raw water is passed through a filter cloth to capture and separate the solid components in the raw water, and the filtered water is discharged into the filtration tank. The solid component captured and separated by the filter cloth was washed off by the recovered water sprayed from the recovery spray, collected by the recovery hopper, and discharged outside the system. At this time, since the elongation rate of the filter cloth is at least 1%, the filter cloth is bent inward toward the inner side of the filter drum while being regulated by the annular stay and the reinforcing ribs, and the collected water is not collected. Will be temporarily stored in. Therefore, the splashing and scattering of the recovered water sprayed is suppressed, and the force for recovering the solid component is applied not as a spot but as a surface.

When the filter drum rotates and reaches the position of the washing spray, the filter cloth is washed with the washing water sprayed from the washing spray, and is subjected to the next solid-liquid separation.

Embodiment In FIGS. 1 and 2, a treatment tank 1 is partitioned by a partition wall 3 and a weir 5, and a raw water tank 2, a filtration tank 4, and a discharge tank 6 are formed.

A hollow central shaft 11 is provided in the filtration tank 4 by the support frames 7a and 7b.
Is fixed and supported, and a filter drum 14 is rotatably supported on its central axis 11 by bearings 12a and 12b. The filter drum 14 has a gear 15 at one end, and a gear 16 driven by a motor (not shown) is engaged with the gear 15.

In the filtration tank 4, facing one end surface 14a of the filtration drum 14,
A disc-shaped sealing plate 9 fixed to the central shaft 11 is provided. Further, as shown in FIGS. 1 and 3, the seal plate 9 and the one end surface 14a of the filtration drum 14 are connected to each other by the seal ring 10.
Is sealed by. Further, as shown in FIG. 1, a raw water introducing pipe 8 is provided between the seal plate 9 and the partition wall 3.

The filtering drum 14 has a structure in which one end surface 14a is opened. On the other hand, the other end surface 14b has a closed structure.

Further, the filtering drum 14 has a body, and this body has three annular stays 17 which are parallel to each other as shown in FIG.
It is composed of a, 17b, 17c and a large number of reinforcing ribs 19 connecting these annular stays 17a, 17b, 17c to each other. Further, on the outer peripheral surface of the annular stays 17a, 17b, 17c,
Filter cloth mounting grooves 18a, 18b, 18c are provided.

In FIG. 1 and FIG. 3, a filter cloth is attached to the above-mentioned body.
20 is wound by fitting its convex portion 21 into the filter cloth mounting grooves 18a, 18b, 18c of the annular stays 17a, 17b, 17c. Then, a flexible urethane resin flat belt 22a is integrally fixed to the outside of the filter cloth 20 by heat fusion or adhesion, and further, a metal band 23a is wound on the flat belt 22a and filtered with the metal band 23a. The cloth 20 is tightened and fixed to the annular stays 17a, 17b, 17c.

The winding end of the filter cloth 20 is fixed to the body as shown in FIG.

That is, only one blind plate 14c is provided on the body between the annular stays 17a, 17b, 17c. A fastener 20a is sewn to one end of the filter cloth 20, and a fastener 20b is sewn to the other end. And the filter cloth 20 is
After being temporarily fixed by the fasteners 20a and 20b on the blind plate 14c, a pressing plate 14d is pressed onto the blind plate 14c and fixed to the body by bolts 14e and nuts 14f.

On the other hand, as shown in FIG. 5, the filter cloth 20 is fixed to the reinforcing ribs 19 by impregnating the filter cloth 20 with a flexible urethane resin to form a band 22b, and further forming a band 22b on it. Presser plate 2
This is done by applying 3b and tightening the whole with screws 24.

The filter cloth has a filter layer formed by raised fibers obtained by directly raising the fabric on the surface of the fabric as described in JP-A-58-207917 and JP-A-59-115720. It will be. The naps lie on the surface of the fabric and are present in a very high density to form a filter layer. Then, the filter cloth is mounted so that the filter layer is inside the body, as shown in FIGS. 3 and 7.

The woven fabric is floated preferably from 3 to 8 with respect to wefts and warps having a single yarn number of 200 to 50,000 consisting of twin yarns or triple yarns of polyester fibers having a thickness of 0.1 to 10 μm, and multifilament yarns, It is preferably made of satin fabric. The wefts are arranged at a density of 20 to 100 yarns / cm, and the wefts are mainly raised in the warp direction. The floating structure is adopted because the number of crossings between the weft and the warp is reduced, and a filter cloth having small surface irregularities can be obtained. In addition, the reason why wefts are raised is that warp yarns are sometimes subjected to a tension (usually the warp yarns are installed so as to be in the circumferential direction of the body). Is low.

On the other hand, the warp is made of synthetic fiber such as polyester fiber, polyamide fiber, polyvinyl alcohol fiber, polypropylene fiber, polyacrylonitrile fiber having a thickness of 10 to 30 μm.
It is preferable to arrange ~ 150 yarns bundled at a density of 0.7 to 3 times the density of the weft yarn. As with the weft yarn, when a warp yarn having a twist of 4 to 15 times / cm is used, the napped hair holding property is improved and it becomes difficult to pull it out.

The filter cloth has an elongation (elongation in the warp direction) of at least 1.0%. This elongation rate is measured as follows.

That is, as shown in FIG. 6, an I-shaped test piece S1 is cut out from the filter cloth. Measurement part formed in the center of test piece S1
S1a has a length of 250 mm and a width of 30 mm. Then, both ends of this test piece S1 are gripped by a tensile tester, an initial load of 100 gf is applied in the vertical direction, and a mark separated by 200 m on the measurement section S1a.
Attach a and b. Next, a load of 12 kgf is applied to the test piece S1, left for 90 minutes, the distance X between the marks a and b after 90 minutes is measured, and the elongation rate Ts is calculated by the following formula. The measurement is
It is preferable to perform it in a room controlled at a room temperature of 25 ° C and a humidity of 60%.

Ts = [(X−200) / 200)] × 100 Referring again to FIGS. 1 and 2, a large number of nozzles 25a extending in the rotation axis direction of the filtration drum 14 are provided outside the filtration drum 14. The recovery spray 25 provided is arranged upstream of the top of the filtration drum 14 in the rotating direction of the filtration drum 14, and similarly the recovery spray 27 is provided with a large number of nozzles 27a.
Are located approximately on top of the filter drum 14. A collection hopper 29 corresponding to the collection spray 25 and a collection hopper 30 corresponding to the collection spray 27 are provided inside the filtration drum 14. Further, on the outside of the filtration drum 14, upstream of the collection spray 25 in the rotation direction of the filtration drum 14, a chemical washing spray 26 similarly provided with a large number of nozzles 26a is arranged corresponding to the collection hopper 29. There is.
Furthermore, inside the filter drum 14, downstream of the recovery spray 27 and the recovery hopper 30 in the rotation direction of the filter drum 14, a cleaning spray 31 similarly having a large number of nozzles 31a is arranged.

As shown in FIG. 7, the recovery spray 25 has one end connected to the other end of a pipe 35 equipped with a pump 33, the end opening into the filtered water when the filter tank 4 is used. Similarly, the recovery spray 27 is connected to the other end of a pipe 36 having a pump 34, one end of which opens into filtered water. The chemical spray 26 is also connected to a pipe 36c equipped with a pump 26b,
c is connected to a chemical bath not shown. Further, the cleaning spray 31 has a pump 37, one end of which opens into the filtered water in the filtration tank 4 through the pipe 13 arranged in the central shaft 11.
Is connected to the other end of the pipe 38 provided with.

The recovery hoppers 29 and 30 are fixed to the central shaft 11. Then, the pipe 39 is connected to the recovery hopper 29 through the central shaft 11.
However, the pipes 40 are connected to the recovery hoppers 30, respectively.

In FIG. 1 and FIG. 2, inside the filter drum 14, a wave-eliminating plate 41 extending in the rotation axis direction of the filter drum 14 is provided in the vicinity of the movement path of the reinforcing rib 19 when the filter drum 14 rotates. It is provided. This wave-eliminating plate 41 is a filtration drum.
Two of them are provided on each of the upstream side and the downstream side in the rotation direction of 14, and the four wave-dissipating plates 41 in total are the second one.
As shown as 41a, 41b, 41c, 41d in the figure, it is fixed and supported by the central shaft 11 by a mounting frame 42.

The wave-eliminating plates 41a, 41b, 41c, 41d are made of punching metal plates having a large number of holes with a diameter of 10 to 50 mm and an aperture ratio of 20 to 80%. Then, the wave-eliminating plates 41a, 41
b, 41c, 41d extend from a position lower than the height of the flow weir 5 to a position higher than the liquid level in the filtration drum 14 at the time of use. The length is equal to the length of the reinforcing rib 19.

To explain the operation of the apparatus described above, in FIG. 1, the raw water supplied to the raw water tank 2 of the treatment tank 1 passes through the raw water introducing pipe 8 and is introduced into the filtration drum 14 from the one end surface 14a of the filtration drum 14. To be done. The introduced raw water is regulated by the seal plate 9 and the other end surface 14b of the filtration drum 14, and is accumulated in the filtration drum 14.

On the other hand, the filtration drum 14 is geared by a motor (not shown).
The raw water, which has been rotated in the direction of the arrow in FIG. 2 at a constant speed through 16 and 15, is introduced into the filtration drum 14 and the filtration tank 4 determined by the liquid level in the filtration drum 14 and when the weir 5 flows. Passing through the filter cloth 20 due to the liquid level difference h (FIG. 7) with the internal liquid level,
The filtered water flows out into the filtration tank 4, further flows out into the discharge tank 6 through the flow weir 5, and is discharged to the outside of the apparatus. On the other hand, the solid component is captured by the filter cloth 20.

At this time, as the filtration drum 14 rotates, the reinforcing ribs 19 and the like move in and out of the liquid surface, causing the liquid surface to swell, but the generated wave is a wave-eliminating plate.
Since it is immediately erased by 41a, 41b, 41c, 41d (FIG. 2), there is almost no fear that the solid components captured on the filter cloth 20 will be washed off. Further, the body of the filtration drum 14 receives a large force according to the liquid level difference h, but the annular stays 17a, 17
The deformation is prevented by b and 17c and the reinforcing rib 19. Similarly, the filter cloth 20 receives a large force, but the annular stay 17
Since it is fixed to a, 17b, 17c, the reinforcing rib 19, and the blind plate 14c, it can withstand this force.

Referring to FIG. 2 and FIG. 7, the solid component in the raw water captured and separated by the filter cloth 20 is sprayed from the recovery spray 25 at the position of the recovery spray 25. It is washed off by (hereinafter referred to as recovered water). At this time, since the filter cloth 20 has a stretch ratio of at least 1%, as shown in FIG.
While being regulated by a, 17b, 17c and the reinforcing ribs 19, it is bent in a convex shape toward the inside of the filtration drum 14, and the collected water is temporarily collected therein, and the collected water is sprayed to this pool. Therefore, the recovered water hardly bounces or scatters, and a force is applied as a surface through the collected recovered water, so that the recovered water is efficiently recovered.

In detail regarding this point, when a filter cloth having an elongation rate of less than 1% is used, the recovered water does not collect on the filter cloth, and the recovered water from the recovery spray directly collides with the filter cloth and bounces off.
The scattering and vibration of the filter cloth not only reduce the recovery efficiency but also shorten the life of the filter cloth. This phenomenon is
The higher the pressure of the recovered water becomes, the more remarkable it becomes.

That is, the ability of the recovered water to recover the solid component is proportional to the amount of recovered water passing through the filter cloth. The amount of passing water when spraying the collected water on the puddle on the filter cloth is about 2.5 times as large as when spraying the collected water directly on the filter cloth at the same pressure. Therefore, the spray pressure of the recovered water is 5 kgf in the device of this invention.
/ cm may be about ² G, but the apparatus having blown directly into the filter cloth are required a pressure of about 12 kgf / cm ² G. Further, since the life of the filter cloth when the recovered water is directly sprayed onto the filter cloth is inversely proportional to the function of the cube of the spraying pressure, the apparatus of the present invention has a filter cloth as compared with a case where the recovered water is directly sprayed onto the filter cloth. The lifespan of is longer than 15 times.

Now, the recovered water that has passed through the filter cloth 20 raises the naps of the filter layer, so that the trapped solid components are easily washed off.
That is, the napped hair forms a layer in the warp direction during filtration to form a fine filter layer and rises in the passing direction of the recovered water at the time of collection to form a gap between the napped hairs, and the solid component is easily washed off. Will be done.

The solid component washed off by the collection spray 25 is discharged to the outside of the system through the collection hopper 29, the central shaft 11, and the pipe 39, but the solid component still remaining is accompanied by the rotation of the filtration drum 14, It reaches the position of another recovery spray 27 and is similarly washed off by the recovered water in the filtration layer 4 sprayed from the recovery spray 27. The solid component recovered at this time is discharged to the outside of the system via the recovery hopper 30, the central shaft 11, and the pipe 40.

The filter cloth 20 after the solid components are recovered is washed with the recovered water in the filter tank 4 which reaches the position of the cleaning spray 31 and is sprayed from the cleaning spray 31, and is again provided for the next solid-liquid separation. By repeating such an operation, solid-liquid separation is promoted.

On the other hand, if the solid-liquid separation is continued for a long time, bacterial bacteria or the like may adhere to the filter cloth 20 to lower the separation ability. In such a case, for example, once a month, filter cloth
Spray chemicals such as acid and alkali from the chemical spray 26 on 20 and wash. At this time, the filtration drum 14 is slowly rotated, for example, at 1 to 60 minutes / revolution. The drug spreads to every corner of the filter layer by the action of capillaries, and the effect is maintained for a long time. When an alkaline drug is used, the alkaline drug reacts with living cells and dissolves them, so that a bactericidal action is also obtained. As the alkaline agent, sodium hypozincate, pseudo sodium, pseudo potassium, etc. are preferable. In addition, hydrochloric acid, sulfuric acid and the like are suitable as the acidic agent, and hydrogen peroxide solution and the like are suitable as the neutral agent. The drug concentration depends on the type of drug, but is
A range of 15% by weight is preferred.

In the embodiment described above, if the filter cloth is divided into several pieces in the circumferential direction and / or the axial direction of the body and is attached, it is easy to attach the filter cloth to the body and to reattach it when it is partially damaged. .

The wave-eliminating plate may be supported so as to move vertically depending on the liquid level in the filtration drum. Further, it may be configured to float on the liquid surface.

One recovery spray and one recovery hopper may be provided. Conversely, three or more can be provided.

Only one recovery hopper may be provided for a plurality of recovery sprays. However, if they are separated, the concentration of the solid component in the recovered water can be increased, and the amount of recovered water can be kept low, which is preferable.

The nozzles of the recovery spray may be arranged in a straight line or may be arranged in a staggered pattern. The staggered arrangement makes it possible to give the filter cloth a hand-kneading effect, and it is possible to obtain a high recovery efficiency even with recovered water at a lower pressure, and moreover, the load on the filter cloth is reduced and the filter cloth life is shortened. It can be extended.

The spraying pressure of cleaning water by cleaning spray is about 1 kgf / cm ² G
The degree is sufficient, and there is almost no concern about damage to the pili filter layer. The cleaning spray may be operated continuously or intermittently, for example, once a day.

Depending on the properties of the solid components, the spray pressure of the recovered water may be 3-10.
In the range of kgf / cm ² G, the spray pressure of washing water is 0.3 to 2 kg.
It can also be changed within the range of f / cm ² G.

EFFECTS OF THE INVENTION In the rotary drum type solid-liquid separation device of the present invention, the body has a filter layer of naps obtained by raising the woven fabric on the surface of the woven fabric, and the elongation percentage is at least 1%. A filtration drum is used in which the cloth is attached so that the filtration layer is inside the body. Therefore, when the collected water is sprayed from the collection spray, the filter cloth is bent inward toward the inside of the filtration drum while being regulated by the annular stay and the reinforcing ribs, and the collected water is temporarily stored therein. In this way, not only the bounce and splash of the collected water can be suppressed, but the force for collecting the solid component is added as a surface rather than as a spot, and it is high even if the spray pressure of the collected water is low. Collection efficiency can be obtained. Further, the vibration of the filter cloth is suppressed, the life of the filter cloth is greatly extended, and the replacement frequency is low.

The recovery efficiency is also improved by the fact that the recovered water that has passed through the filter cloth raises the naps of the filter layer, and the solid components that have been trapped are easily washed off. That is, the napped hair forms a layer in the warp direction during filtration to form a fine filter layer that lays finely, and at the time of collection, stands up in the passing direction of the collected water to form a gap between the napped hairs, so the solid components are easily washed. To be dropped. The improvement of such recovery efficiency is that the filter cloth is a satin woven fabric in which spun yarn or multi-filament yarn of polyester fiber having a thickness of 0.1 to 10 μm is used as weft yarn and synthetic fiber yarn is used as warp yarn, and the surface of the woven fabric is used. Thickness obtained mainly by raising weft
When the filter layer is formed by naps of 0.1 to 10 μm, it is further improved.

Further, if a plurality of recovery sprays are provided in the rotation direction of the filtration drum and a recovery hopper is provided corresponding to each of the recovery sprays, more reliable recovery of solid components becomes possible,
Further, the concentration of the solid component in the recovered water can be increased.

Furthermore, if a pipe with one end opening into the filtered water in the filter tank is connected to the recovery spray or the cleaning spray at the other end and the recovered water is used for recovering solid components or cleaning the filter cloth, it is useful. Not only the cost is low, but also the concentration of the solid component in the recovered water can be further increased.

Furthermore, on the outside of the filtration drum, facing the recovery hopper, a chemical washing spray for washing the filter cloth with a chemical is provided,
For example, if the filter cloth is sprayed with a chemical such as an alkaline agent or an acidic agent once a month for washing, it is possible to prevent the deterioration of the separation ability due to the adhesion of bacterial bacteria to the filter cloth. As a result, solid-liquid separation can be continued for a long time. Moreover, since a filter cloth having a filter layer formed by naps obtained by raising the cloth on the surface of the cloth is used, the drug spreads to every corner of the filter layer by the action of the capillary, and the effect of the drug is prolonged. Can be maintained over.

[Brief description of drawings]

The drawings all show a rotary drum type solid-liquid separation apparatus according to an embodiment of the present invention. FIG. 1 is a schematic vertical sectional view of the apparatus, and FIG. 2 is a schematic horizontal sectional view of the apparatus. FIG. 4 is a schematic perspective view showing an attachment portion of the filter cloth to the annular stay of the body, FIG. 4 is a schematic cross-sectional view showing an attachment portion of the filter cloth to the body at the winding end, and FIG. FIG. 6 is a schematic cross-sectional view showing an attachment portion of the cloth to the reinforcing ribs, FIG. 6 is a schematic plan view of a test piece used for measuring the elongation of the filter cloth, and FIG. 7 is a recovery spray, a cleaning spray and a medicine. FIG. 8 is a layout diagram of the washing spray, and is a model diagram showing how the solid component is recovered by the recovery spray. 14: Filtration drum 17a, 17b, 17c: Annular stay 19: Reinforcing rib 20: Filter cloth 25: Recovery spray 26: Chemical spray 27: Recovery spray 29: Recovery hopper 30: Recovery hopper

 ─────────────────────────────────────────────────── ─── Continuation of front page (56) References JP-A-55-86511 (JP, A) Actual opening 61-25911 (JP, U) Actual opening 63-111905 (JP, U) Revised and filtered <Factory Operation Series> Sho 51. 11.25 Chemical Co., Ltd.

Claims (5)

[Claims] 1. A raised body obtained by raising a fabric on a surface of a fabric on a body having a plurality of parallel annular stays and a plurality of reinforcing ribs connecting the circular stays to each other. A filter drum having a filter layer and a filter cloth attached to the inside of the body is placed in a filter tank, and the raw water is fed inside the filter drum while rotating the filter drum in one direction. A solid-liquid separation device for capturing and separating the solid components in the raw water by passing through the filter cloth and allowing the filtered water to flow out into the filtration tank, a. On the outer side, facing the filter cloth, a recovery spray for washing off the solid components captured on the filter cloth is provided, and on the inside of the filter drum, facing the recovery spray, Solids washed from above the filter cloth A collection hopper for collecting the components is provided, and c. Inside the filtration drum, and downstream of the collection spray and the collection hopper in the rotation direction of the filtration drum, facing the filter cloth. And a cleaning spray for washing the filter cloth, d. The filter cloth has an elongation Ts defined by the following formula of at least 1.0%, a rotary drum type solid-liquid separation device . Ts = [(X−200) / 200] × 100 However, X is the length of the measurement part cut out from the filter cloth is 25
90 mm with a load of 12 kgf on a 0 mm, 30 mm wide test piece
The distance between two positions on the measuring part when held for a minute, and these two positions are pre-marked as positions 200 mm apart from each other with an initial load of 100 gf being applied to the test piece. 2. A woven fabric comprising a spun yarn of polyester fibers having a thickness of 0.1 to 10 μm or a multifilament yarn as a weft yarn,
It is made of satin woven fabric with synthetic fiber yarn as warp, and the thickness of the woven fabric is 0.1-10 μm
The rotary drum type solid-liquid separation device according to claim (1), wherein the filter layer is formed by raised fibers. 3. A plurality of recovery sprays are provided in the rotating direction of the filtration drum, and a recovery hopper is provided corresponding to each of the recovery sprays. ) The rotary drum type solid-liquid separator according to the item (1). 4. The recovering spray and the cleaning spray each have a pipe, one end of which is opened in the filtered water in the filter tank, connected at the other end thereof. The rotating drum type solid-liquid separator according to item (3). 5. A chemical washing spray for washing the filter cloth with a chemical is provided on the outside of the filtration drum so as to face the recovery hopper, and the chemical washing spray is provided. The rotating drum type solid-liquid separator according to item (3) or (4).