JPH0278406A - Rotary drum-type solid-liquid separator - Google Patents

Abstract

PURPOSE:To improve the solid-liq. separation capacity of the title separator by washing off the cake collected by the drum filter cloth with a spray from the outside of the filter drum, recovering the cake in a hopper in the drum, and specifying the elongation percentage of the filter cloth. CONSTITUTION:A liq. for recovering the cake collected on the filter cloth 20 is injected toward the filter cloth 20 from the spraying means 25 and 27 arranged outside the filter drum 14 in opposition to the filter cloth 20. The cake washed off by the recovering liq. is recovered in the recovery hopper means 29 and 30 provided in the drum 14. When the elongation percentage Ts of the filter cloth is defined as Ts=[(X-200)/200]X100, the Ts is controlled to at least 1.0%. In the equation, X is the distance between the two points of the test cloth cut out from the filter cloth material and having 250mm length and 30mm width when the load of 12kqf is applied to the test cloth and kept for 90 min, the two points are previously marked under the conditions where the initial load of 100gf is applied on the test cloth, and the distance is controlled to 200mm.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an apparatus for performing solid-liquid separation using a filter drum having a filter cloth attached to the drum.

(Prior art and problems to be solved) For example, U
, S, Patent No. 4,038,187, JP-A-49-80664, JP-A-61-35886
As described in the publication, raw water is introduced into the inside of a filter drum whose body is equipped with a filter medium such as a stainless steel wire mesh or flocked filter cloth, and the raw water is filtered by passing through the filter medium while rotating the filter drum. A device that separates solid and liquid is generally called a rotating drum type solid-liquid separator, and is widely used in various fields.

By the way, in a rotating drum type solid-liquid separator, the solid-liquid in the raw water is separated by passing the raw water through a filter cloth,
The solid components separated and captured by the filter cloth are continuously recovered by spraying recovered water onto the filter cloth. In this way, in a rotating drum type solid-liquid separator, it is necessary to alternately separate the solid and liquid and recover the separated solid components. It requires excellent properties in both component blocking ability and recovery ability.

In addition, in a rotating drum type solid-liquid separator, raw water passes through using the difference in liquid level inside and outside the filtration drum. A corresponding external force is applied.

In order to withstand this external force, the IIt overdora drum class is
A plurality of annular stays were arranged parallel to each other in the axial direction of the drum, and a plurality of reinforcing lips were stretched horizontally inside the body between these annular stays to connect each stay. It has a rotating drum structure. A filter medium is wrapped around the body of this rotating drum.

The filter medium is not only subjected to an external force corresponding to the difference in liquid level as described above, but also to the force of water pressure of recovered water or washing water that is blown onto the filter medium when collecting captured solid components or when cleaning the filter medium after collection. . For this reason, there is no problem if the filter medium is of high strength, such as stainless steel wire mesh, but if the filter medium is made of cloth, that is, filter cloth, it must be strong enough to withstand these external forces. There is.

Furthermore, in a rotating drum type solid-liquid separator, the solid components captured in the filter medium are conventionally washed away by the recovered components sprayed from a recovery spray nozzle installed inside the upper part of the filter drum. It is discharged from the system through a collection hopper installed inside. Then, after the filter medium is washed by filtered water jetted from a cleaning spray nozzle located on the outside of the filtration drum located downstream of the position of the recovery spray in the rotational direction of the filtration drum, solid-liquid separation is performed again. served. Furthermore, there is also an apparatus having a structure in which the solid components are washed off from the filter medium and the filter medium is washed at the same time.

However, the recovered component is sprayed directly onto the captured solid component from the nozzle of the recovered spray.

The trapped solid components are not only washed away, but some of them may be pushed out to the outside of the filter medium, that is, to the filtration side, and as a result, the solid components leak onto the filter side surface of the filter medium, deteriorating the quality of the filtrate water. The problem arises that

In addition, some of the recovered components are recycled and used, but solid components in the recovered components are crushed by the circulation pump and become fine particles, leading to clogging of the filter media, or they may enter the filtered water and be filtered. Deteriorate water quality. Furthermore, the circulation line for the recovered components, especially the nozzle for the recovered spray, may become clogged, causing problems in terms of operational management.

In addition, in the case of a device that simultaneously washes off solid components and cleans the filter medium, when the filter medium is a filter cloth with a raised filter layer, the raised filter layer located inside the filter drum is sprayed with high-pressure water. There is an unavoidable problem that the filter media will be damaged and its ability to trap solid components in raw water will be reduced, that is, the service life of the filter media will be shortened.

The present invention was made to solve these problems, and has excellent solid-liquid separation ability, easy recovery of solid components captured by the filter medium, less wear and damage of the filter medium, and long service life. Therefore, it is an object of the present invention to provide a rotating drum type solid-liquid separator in which the frequency of replacing the filter medium is low. .

(Means for Solving the Problem) In order to achieve the above-mentioned object, according to the present invention, a plurality of annular stays arranged in parallel to each other and a plurality of reinforcements horizontally installed by connecting the annular stays are provided. A filter drum is provided with a filter cloth attached to a rotating drum body made of ribs, raw water is introduced into the inside of the filter drum, and the raw water is filtered by passing through the filter cloth while rotating the filter drum. A solid-liquid separator for separating solid-liquid, which is disposed on the outside of the filter drum facing the filter cloth, is configured to apply a recovery liquid to the filter cloth for recovering solid components captured by the filter cloth. and a recovery hopper means disposed inside the filter drum to recover the solid components washed away by the recovery liquid, and the elongation rate Ts of the filter cloth is set to Ts. −((X −200)/200
) X100 (here, X is cut out from the filter cloth material,
This is the distance between two points of a test cloth whose length is 250II11 and width is 30III when the test cloth is held for 90 minutes with a load of 12 kgf applied. These are two arbitrary positions on the measurement part that are pre-marked in a state where the measurement area is 200 mm apart from each other. ), there is provided a rotating drum type solid-liquid separator characterized in that the elongation Ts of the filter cloth is at least 1.0%.

(Function) A spray means is disposed outside the filter drum, and the spray means sprays a recovered liquid toward the filter cloth when solid components are recovered. At this time, because the elongation rate of the filter cloth is high,
The filter cloth stretched between the annular stay and the reinforcing ribs is curved in a convex shape toward the inside of the filter drum, and the collected liquid accumulates on the curved filter cloth. Therefore, the recovered liquid injected from the spray means does not directly collide with the filter cloth, but applies pressure to the accumulated recovered liquid, thereby improving the ability of the recovered liquid to pass through the filter cloth. and,
The solid components trapped on the inside of the filter cloth are washed away into a collection hopper means arranged inside the filter drum as the collected liquid passes through the filter cloth.

(Example) Hereinafter, a rotating drum type solid-liquid separator according to an example of the present invention will be described in detail based on the drawings.

In FIGS. 1 and 2, a treatment tank 1 is partitioned by a partition wall 3 and a discharge layer 5, and a raw water tank 2, a filtrate tank 4, and a discharge tank 6 are formed. Inside the filter/& tank 4, a support frame 7a,
A hollow central shaft 11 is fixed and supported by 7b, and a filter drum 14 is mounted on the central shaft 11 with bearings 12a and 12b.
It is rotatably supported by. The 1ita drum 14 includes a gear 15 formed on the outer periphery of one end thereof, and a gear 16 fixed to a drive shaft of a motor (not shown) meshes with the gear 15.

A disc-shaped sealing plate 9 is provided within the filtrate tank 4 and facing one end surface 14a of the filtration drum 14.

This seal plate 9 is fixed to the central shaft 11.

Further, as shown in FIGS. 1 and 3, the seal plate 9 and the one end surface 14a of the filter drum 14 are connected to the seal ring 10.
is sealed by. Furthermore, as shown in FIG. 1, a raw water introduction pipe 8 is provided between the seal plate 9 and the partition wall 3, and the raw water tank 2 and the inside of the filtration drum 14 are communicated through this raw water introduction pipe 8. .

The filtration drum 14 has an open structure on one end surface 14a, that is, the surface on the seal plate 9 side, so that raw water can be taken into the inside thereof. On the other hand, the other end surface 14b
That is, the surfaces of the five discharge layers have a sealed structure.

Further, as shown in FIG. 1, annular stays 17a are provided at both ends and the center of the filter drum 14.

+7b and 17c are arranged parallel to each other, and the outer peripheral surface of each annular stay has grooves 18a and 18b for attaching the filter cloth.

18c is provided with an annular stay 17a.

A large number of reinforcing ribs 19 are stretched horizontally between 17b and 17c, thereby interconnecting the annular stays.

In FIG. 1 and FIG. 3, the annular stay 1 described above is shown.
7a, 17b, 17c and the reinforcing rib 19, a filter cloth 20 is provided, and a convex portion 21 at both ends and the center thereof is formed on the outer peripheral surface of the annular stay.
It is wound so as to engage with 18b and 18c.

In the circumferential direction of the filter drum 14, as shown in FIG. 4, a blind plate 14c extending in the longitudinal direction is provided as a frame between annular stays 17a and 17c at both ends. One side 20a and the other side 20b of a pair of fasteners consisting of, for example, a large number of loop-shaped locking members and a mushroom-shaped locking piece group are sewn on one surface and the other back surface of the edge of the filter cloth 20. There is.

When attaching the filter cloth 20 to the filter drum 14, after the fasteners 20a and 20b are overlapped and temporarily fastened on the outer surface of the blind plate 14c, the end of the filter cloth 20 is attached to the band-shaped presser plate 1.
4d and is pressed against the blind plate 14c, and is fixed to the filter drum 14 by a port 14e and a nut 14f.

A flexible flat bell 22a made of urethane resin is integrally fixed to the outside of the part of the d# cloth 20 around which the annular stays 17a, +7b, and 17c are wrapped by heat fusion or adhesive. , Further, by wrapping an annular metal band 23a thereon and tightening this metal hand 23a, this part of the filter cloth 20 becomes an annular stay 17a,
17b and 17c.

Further, in the portion of the filter cloth 20 outside the reinforcing ribs 19, a fifth
As shown in the cross-sectional view in the figure, a filter cloth 20 is impregnated with flexible urethane resin to form a band 22b, a metal holding plate 23b is placed on top of the band 22b, and screws are tightened at multiple locations. 24 to tighten the whole thing, and remove the filter cloth 20.
is fixed to the reinforcing lip 19.

In addition, considering the ease of attachment of the filter cloth 20 to the filter tram 14 and the economic effect when replacing a partially torn filter cloth, the filter cloth 20 is divided in the circumferential direction of the drum and/or in the direction of the rotation axis. A plurality of filter cloths may be attached to the filter drum 14.

The filter cloth 20 is made by directly covering the surface of a fabric, which is a base material, and at least the weft is made of polyester fibers, as described in JP-A-58-207917 and JP-A-59-115720. Thickness obtained by brushing 0.1-
Covered with 10μm ultra-fine fiber naps, the naps create a
It is formed by forming ti. On the surface of this fabric, the naps of ultrafine fibers lie and are present at a high density, and the fabric surface is covered with a large number of naps in a layered manner to form a seed layer with very little surface irregularity.

The above-mentioned woven fabric has 200 to 5 oooo single weft yarns made of twin or triple spun yarns or multifilament yarns of polyester wound fibers having a thickness of 0.1 to 10 IIm, relative to the warp yarns, preferably 3 to 5 mm. It consists of eight floating strands, preferably satin fabric. Then, the weft yarns have a density of 20 to 100 threads/cm, and the width direction of the filter cloth (filter drum I4
The warp threads are arranged in the longitudinal direction (the circumferential direction of the filter drum 14), and the weft threads are mainly raised in the longitudinal direction (warp direction). The reason why the floating structure is adopted is that this reduces the number of intersections between the weft and warp yarns, resulting in a filter cloth with fewer surface irregularities. Further, the reason why the weft yarns are mainly raised is that the warp yarns are subjected to a large spreading tension, and if the warp yarns are raised, the strength of the filter cloth will be reduced.

On the other hand, the warp is a bundle of 10 to 150 synthetic fibers such as polyester fibers, polyamide fibers, polyvinyl alcohol fibers, polypropylene fibers, and polyacrylonitrile fibers with a size of 10 to 30 μm, and the density of the weft is 0.7 to 30 μm.
Preferably, they are arranged at three times the density. It is preferable to use yarns with a twist of 4 to 15 times/cm in the weft and warp yarns, since this improves the retention of the raised naps and makes them less likely to come off.

The filter cloth 20 has an elongation rate (elongation rate in the warp direction) of at least 1. It is necessary to be OX. The elongation rate of the filter cloth 20 is measured as follows.

First, a test cloth Sl having an I-shaped planar shape is cut out from a filter cloth material, as shown in FIG.
has a longitudinal length of 251)+m and a width of 30m+
It is w. Both ends of the test cloth 31 are gripped by a tensile testing machine, an initial load of 100 gf is applied in the vertical direction, and the test cloth 31 is placed on the measurement part Sla with a 200 gf load applied in the longitudinal direction across the center position.
Mark lines a and b are drawn apart by +++. Next, a load of 12 kgf is applied to the test cloth 31 and left for 90 minutes. After 90 minutes have elapsed, the distance x between mark lines a and b is measured, and the elongation rate Ts is calculated from the following equation.

Elongation rate T s = C(X-200)/200))
100 The elongation rate was measured at a room temperature of 25"C and a humidity of 60"C.
It is preferable to carry out the test in a room controlled by χ.

When using such a filter medium, as shown in FIGS. 3 and 7, the seed layer should be on the inside of the filter drum 14, and the raised fluff should be in the opposite direction to the rotation direction (arrow direction) of the filter drum. It is mounted to face the direction.

Referring to FIGS. 1 and 2, on the outside of the filtration drum 14, a recovery spray 25 equipped with a large number of nozzles 25a arranged in the drum axis direction is located at the upper right position when viewed from the drum center axis in FIG. That is, the recovery spray 27 is disposed at a position upstream of the top of the filter drum 14 in the drum rotational direction, and also has a large number of nozzles 27a arranged in the drum axis direction, and is located almost directly above the drum center axis. It is arranged. In response to these recovery sprays 25 and 27, a recovery hopper 29 is installed inside the filtration drum 14.
．． 30 are provided. Further, on the outside of the filtration drum 14 and upstream in the rotational direction of the filtration drum 14 with respect to the recovery spray 25, a chemical cleaning spray 26 equipped with a nozzle 26a is installed adjacent to the recovery spray 25. 14 and on the downstream side of the rotational direction of the filter drum 14 with respect to the recovery spray 27, cleaning sprays 31 each having a large number of nozzles 31a are provided.

As shown in FIGS. 1 and 7, the recovery sprays 25 and 27 are connected to pipes 35 each having one end opened below the liquid level of the filtration tank 4.
．． 36, respectively connected to each other end of each pipe 35.36
Pumps 33 and 34 are respectively disposed in the middle. Further, the chemical cleaning spray 26 is connected to a pipe 26c equipped with a pump 26b, and the pipe 26c is connected to a chemical tank (not shown). The cleaning spray 31 is applied to the central axis 11
One end of the pipe 38 is also connected to the other end of a pipe 38 which opens below the liquid level of the filtration tank 4 via a pipe 13 disposed inside, and a pump 37 is disposed in the middle of the pipe 38.

Further, the collection hoppers 29 and 30 are fixed to the central shaft 11, and a pipe 39 is connected to the collection hopper 29, and a pipe 40 is connected to the collection hopper 30 via the central shaft 11.

In FIGS. 1 and 2, a drum rotation axis is located inside the filter drum 14 near the locus of movement of the reinforcing ribs 19 when the filter drum 14 rotates, and at the position of the liquid level during use. The wave-dissipating plate 41 extending in the direction il!
Two drums are provided at each position on the upstream and downstream sides of the overdraft drum 14 in the direction of rotation. A total of four wave-dissipating plates 41 are fixed and supported on the central shaft 11 by a mounting frame 42, as shown as 41a, 41b, 41c, and 41d in FIG. These wave-dissipating plates 41a, 41
b, 41c.

41d has a large number of holes with a diameter of 10 to 50,
It is made of a punched metal plate with an aperture ratio of 20 to 80%. Therefore, the above-mentioned wave-dissipating plates 41a, 41
b, 41c, and 4Jd extend vertically in the liquid depth direction from a position lower than the height of the discharge layer 5 to a position higher than the highest liquid level in the filtration drum 14 during use. Further, the length is shifted, such as that of the reinforcing rib 19.

The wave-dissipating plate may be supported so as to move up and down depending on the liquid level within the filter drum. Furthermore, it may be configured to float on the liquid surface.

To explain the operation of the above-mentioned device, in FIG. 1, raw water supplied to the raw water tank 2 of the treatment tank 1 passes through the raw water introduction pipe 8 and is fed to iI! The filter drum 14 is introduced into the filter drum 14 from one end surface 14a having an open structure. The introduced raw water is regulated by the seal plate 9 and the surface 14b having a sealed structure on the other end side of the filtration drum 14, and is stored in the filtration drum 14.

On the other hand, the filtration drum 14 is rotated at a constant speed in the direction of the arrow (FIG. 2) by a motor (not shown) via a gear 16.15, and the raw water introduced into the filtration drum 14 is Due to the liquid level difference h (Fig. 7) between the liquid level in the filtrate tank 4 and the liquid level in the 1 ota tank 4 determined by the partition wall 3 and the discharge layer 5, only the liquid component passes through the filter cloth 20 and enters the filtrate tank 4. It flows out, further flows into the discharge tank 6 via the discharge layer 5, and is discharged outside the apparatus. On the other hand, the solid component is filter cloth 20
captured by As the filter drum 14 rotates, the reinforcing ribs 19 and the like move in and out of the liquid surface, making the liquid surface ripple, but the generated waves are immediately erased by the wave-dissipating plates 41a, 41b, 41c, and 41d (Fig. 2). Therefore, there is almost no worry that the solid components captured by the filter cloth 20 will be washed away.Furthermore, although the filter drum 14 is subjected to a large force corresponding to the difference in liquid level, its deformation is prevented by the action of the reinforcing ribs 19. Prevented. Similarly, the filter cloth 20 is also subjected to a large force, but the filter cloth 20
As shown in the figure, the convex portion 21 is the groove 18a for attaching the filter cloth,
The metal band 23 is engaged with 18b and 18c.
a, and a presser foot 23 is attached to the reinforcing rib 19.
The above-mentioned pressure can be withstood by being fixed by screws 24 via b.

In FIGS. 2 and 7, the solid components in the raw water captured inside the filter cloth 20 (FIG. 3) eventually reach the recovery spray 25 position as the filter drum 14 rotates, and the pump 33 is activated. The water is washed away by filtered water (hereinafter referred to as recovered water) in the filtrate tank 4 which is ejected from the nozzle 25a through the provided piping 35. Since the filter cloth 20 used has an elongation rate of 1% or more in the warp direction, the annular stay 17a
.

Filter cloth 2 stretched between 17b, +7c and reinforcing ribs 19
0 can be curved convexly in the direction of the pressure acting on the filter cloth 20, as shown in FIG. As a result, recovered water accumulates on the curved filter cloth 20 as shown in FIG.
The recovered water injected from 5a does not directly collide with the filter cloth 20, but applies pressure to the accumulated recovered water, thereby improving the ability of the recovered water to pass through the filter cloth.

If a filter cloth with a small elongation rate is used, the recovered water will not accumulate on the filter cloth, and the recovered water jetted from the nozzle will directly collide with the filter cloth, causing the filter cloth to vibrate. If the injection pressure of the recovered water is increased in order to improve the performance, the filter cloth will vibrate violently and the life of the filter cloth will be significantly shortened. The life of the fabric is an exponential function of the injection pressure (
It is said to be inversely proportional to the cube of the injection pressure. On the other hand, the recovery capacity of recovered water is proportional to the amount of recovered water passing through the filter cloth. As mentioned above, when pressure is applied to the collected water collected on the filter cloth 20 and the water permeates through the filter cloth 20, the amount of permeation is approximately the same as when the collected water is directly injected onto the filter cloth with the same injection pressure. It reaches 2.5 times. Therefore, in the separation device of this example, the injection pressure of the recovered water is 5k to ensure the necessary recovery capacity.
While approximately gf/cm"G is sufficient, when the recovered water is injected directly onto the filter cloth, an injection pressure of approximately 12 kgf/cm"G is required. As a result, the life of the filter cloth of the separator of the present invention is 15 times longer than when recovered water is directly injected onto the filter cloth.

The recovered water that has passed through the filter cloth 20 causes the filter fibers of the napped layer of the filter cloth 20 to stand up, and the solid components captured in the napped layer are easily washed out. In other words, the napped fibers in the napped layer of the filter cloth 20 lie down in layers in the warp direction during solid component filtration, forming a fine seed layer, while during collection they stand up in the falling direction of the collected water and form a layer between the napped fibers. A gap is created between the two, resulting in a coarse mesh that allows solid components to easily fall through. In other words, the filter cloth has good trapping performance and at the same time excellent recovery ability.

The recovered components washed away by the recovered water injected from the nozzle 25a are collected in the recovery hopper 29, the central shaft 11, and the piping 39.
is discharged from the system through the As the filtration drum 14 rotates, the recovered components that still remain after this washing process reach the recovery spray 27, and are sprayed out from the nozzle 27a through a pipe 36 equipped with a pump 34. It is washed away by filtered water (recovered water) in the tank 4 in the same manner as the recovery by the nozzle 25a described above.

The remaining recovered components recovered at this time are discharged to the outside of the system through the recovery pumper 30, the central shaft 11 and the piping 40.

The nap seed layer of the filter cloth 20 from which the recovered components have been collected reaches the position of the cleaning spray 31, passes through the pipe 38 equipped with the pump 37 and the pipe 13 in the central shaft 11 connected thereto, and is sprayed out from the nozzle 31a. It is washed with filtered water in the filtration tank 4, and is again subjected to the next solid-liquid separation. By repeating such operations, solid-liquid separation in the raw water is advanced.

Only one of the recovery spray and the cleaning spray may be provided. This is because the recovery spray also has a cleaning effect, and solid components can also be recovered by the cleaning spray. Note that these recovery sprays and cleaning sprays are
The number of filters is not limited to one, but more can be installed in the rotational direction of the filter drum.

Further, in the embodiment described above, the recovery spray nozzles 25a and 27a are arranged in a straight line, but instead of this, they may be arranged in a staggered arrangement with respect to each other in the drum rotation direction. This will give the filter cloth a hand kneading effect, for example 5 kgf/c+
Even when spraying at a low pressure of s"G, it is possible to achieve a higher solid component recovery effect than when spraying at a high pressure of approximately 10 kgf/cs"G in the case of recovery spray books, and the load on the filter cloth is small. As a result, its service life will not be shortened. In addition, the cleaning spray from the nozzle can sufficiently clean the filter cloth at a low pressure of approximately 1 kgf/cm'G, and since the pressure is low, there is no risk of damaging the ultrafine fibers of the napped seed layer. The cleaning spray may be operated continuously as required, or may be operated intermittently about once a day.

In addition, depending on the properties of the components captured and recovered on the filter cloth, the ejection pressure of the recovery spray may be changed as appropriate in the range of 3 to 10 kgf/c+a''G, and the ejection pressure of the cleaning spray may be changed within the range of 0.3 to 2 kgf/c+s2G. Also, instead of two-stage recovery as in the embodiment, one-stage recovery may be used.

The collection hoppers may share one hoop and bar. However, by separating them, it is possible to increase the concentration of solid components in the recovered components and to keep the flow rate of the recovered spray low, which is preferable.

When solid-liquid separation is performed for a long time using a solid-liquid separator, the filter cloth 2
0 may be contaminated with bacteria and the like, resulting in deterioration of the separation ability. In such cases, the pump 2 should be cleaned periodically, for example once a month, to cleanse these bacteria.
6b, a chemical such as acid or alkali is sprayed onto the filter cloth 20 from the nozzle 26a of the chemical cleaning spray 26 via the pipe 26c to clean bacteria and the like. In that case, the filter drum 14
for a time (for example, 1 to 60 minutes/1 minute axis 1) and rotate slowly. The drug dispersed by the capillary layer of the filter cloth 20 spreads to every corner of the capillary layer, prolonging the effect of the drug. It lasts for a long time.If an alkaline drug is used, it reacts with living cells and dissolves them, so it has a high bactericidal effect.Sodium siachlorate, caustic soda, caustic potash, etc. are suitable as alkaline drugs. Hydrochloric acid, sulfuric acid, etc. are suitable as acidic chemicals, and hydrogen peroxide water, etc. are suitable as neutral chemicals.And, as for the concentration of the chemicals to be sprayed, in the case of sodium siachlorate, effective chlorine A suitable range is 1 to 15% by weight in terms of the amount.Also, 1 to 15% by weight is also suitable for other alkaline agents, acidic agents and neutral agents.

The device of this invention can be used in a variety of applications. For example, it can be used for solid-liquid separation of lake water or river water. In addition, sludge, scum, and flocs generated during sewage treatment, such as so-called suspended sludge, such as surplus sludge produced by activated sludge treatment equipment, and so-called fixed sludge, discharged from biofilm treatment equipment, are also included. It can be used for filtering and concentrating cleaning water, sludge, etc. Furthermore, it can be used for solid-liquid separation in the manufacturing process of paper valves, foods, sake, miso, etc., and for the recovery of valuables in chemical processes.

(Effects of the Invention) As described in detail above, according to the rotating drum type solid-liquid separator of the present invention, the spray means is disposed on the outside of the filter drum facing the filter cloth, and the spray means A recovery liquid for recovering solid components captured by the filter cloth is injected toward the filter cloth, and the solid components washed away by the recovery liquid are collected by a recovery means disposed inside the filter drum. Since the elongation Ts of the filter cloth is specified to be 1.0% or more, it has excellent solid-liquid separation ability, and it is easy to recover the solid components captured by the filter cloth. Since the pressure can be kept low, there are few IN scratches on the filter cloth, it can be used for a long time, and it has excellent effects such as less frequent relining and replacement of the filter cloth.

[Brief explanation of the drawing]

The first is a front sectional view of the rotating drum type solid-liquid separator of the present invention, and FIG. 2 is a side sectional view of the separation device shown in FIG. 1.
Fig. 3 is a partially enlarged perspective view showing how the filter cloth is attached to the annular stay and reinforcing ribs, Fig. 4 is a partial cross section showing how to join the edges of the filter cloth, and Fig. FIG. 6 is a plan view of a test cloth subjected to a filter cloth elongation test; FIG. FIG. 8, a piping diagram showing the arrangement of the chemical cleaning spray, is a partial sectional view schematically showing how solid components are recovered by the recovery spray. l...processing tank, 14...11# over drum, 17a~
17c... Annular stay, 19... Reinforcement rib, 20
... Filter cloth, 25.27 ... Recovery spray, 29.30
...Collection hopper, 26...Medical cleaning spray, a, b
... Mark line, S 1 ... Two-person test cloth. Applicant Toshi Co., Ltd. Company agent Patent attorney Kanji Nagado Figure 2 3/σ/4275.2725tq 2526,/
Figure 4/4θ /4d Figure 5 Figure 6 Book Figure 8

Claims (1)

[Claims] A filtration system in which a filter cloth is attached to the body of a rotating drum, which is made up of a plurality of annular stays arranged parallel to each other and a plurality of reinforcing ribs that connect the annular stays and extend horizontally. In a solid-liquid separator comprising a drum, raw water is introduced into the inside of the filtration drum, and solid-liquid in the raw water is separated by passing through the filter cloth while rotating the filtration drum, which is opposite to the filter cloth. a spray means disposed outside the filtration drum for spraying a recovery liquid toward the filter cloth for recovering solid components captured by the filter cloth; and a spray means disposed inside the filtration drum. , a recovery hopper means for recovering the solid components washed away by the recovery liquid, and the elongation rate Ts of the filter cloth is expressed as Ts=[(X-200)/200]
×100 (here,
This is the distance between two points when a load of 12 kgf is applied and held for 90 minutes. Any two positions above. ), the elongation Ts of the filter cloth is at least 1.0%, a rotating drum type solid-liquid separator.