JPS6044011A - Solid-liquid separation apparatus - Google Patents

Abstract

PURPOSE:To provide a solid-liquid separation apparatus high in suction effect in a vacuum suction part and capable of preventing the damage of filter cloth, constituted by forming each of a plurality of filter cloth guide rolls, which are mounted to the vacuum suction part of a filter cloth back surface side and mutually arranged in parallel, from a cylindrical roll with orifices or a roll with grooves. CONSTITUTION:A solid-liquid mixture 6 is supplied to filter cloth running toward a direction shown by the arrow in an endless state and the liquid component thereof is collected in a filtrate receiving tank 8 through the filter cloth 1 by gravity and vacuum sucking action applied to said tank 8. At this time, the interior of the tank 8 can be maintained to a desired vacuum degree by reduced power because each filter cloth guide roll 10 is a cylindrical roll with orifices. In the next step, the liquid component collected in the tank 8 is discharged out of a dehydrator from a discharge port 9. On the other hand, the component on the filter cloth 1 is carried between the transfer drum 14 and a squeeze roll 15 with the running of the filter cloth 1 to obtain a solid component. The filter cloth 1 is washed from the front and back surfaces by water spray nozzle 17, 18 and the liquid component due to washing is further squeezed off by a drain roll 19 to again subject the filter cloth 1 to dehydration.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solid-liquid separation device, and more specifically, to a solid-liquid separation device such as a filter cloth traveling type filter or a DI2 water machine.

Recently, short fiber strings have been flocked onto the surface of textile base materials so that they are slanted in one direction, or the base material is raised to create raised naps.
A filter cloth was developed in which the raised fluff forms a wave layer. Along with this, such a filter cloth is processed to be endless, and while the endless filter cloth is orbited in one direction on a constant orbit,
So-called filter cloth traveling type filters and dehydrators (hereinafter collectively referred to as solid-liquid separators) that supply a solid-liquid to the surface of a filter cloth and separate solid components and liquid components in the solid-liquid. is being developed. In such a solid-liquid separator, in order to perform solid-liquid separation more efficiently, a vacuum suction section is provided on the back side of the filter cloth and opposite to the solid-liquid supply section, so that the solid liquid supplied onto the filter cloth is The liquid component in the liquid is sucked to promote its passage. Such a vacuum suction section has a depth of 500 m in the water column.
Since it is maintained at a fairly high decompression state of more than m,
The suction force pulls the filter cloth, causing it to flex significantly.

In conventional solid-liquid separators, in order to prevent the filter cloth from bending in the vacuum suction section, a plurality of so-called non-porous guide rolls, which do not have holes or grooves, are placed parallel to each other in the vacuum suction section. It is placed. However, such conventional solid-liquid separation devices have drawbacks as explained below.

That is, when a large number of non-porous guide rolls are arranged, the frontage area of the vacuum suction section is reduced by that amount, and the suction effect is reduced. Therefore, in this case, it is necessary to increase the length of the vacuum suction section in the running direction of the filter cloth or to increase the degree of vacuum. However, if the length of the vacuum suction section is increased, the number of rolls must also be increased, and damage to the wave cloth due to contact with many rolls becomes a problem.

Moreover, if the degree of pressure reduction is increased, not only will the power cost for obtaining the reduced pressure state increase, but the running resistance of the wave cloth will increase, so the driving cost will also increase, leading to higher running costs. Naturally, the greater the running resistance, the greater the damage to the filter cloth.

On the other hand, if the distance between the rolls is increased in an attempt to obtain a greater suction effect, the filter cloth becomes more deflected, and the filter cloth comes to wrap tightly around the upper half of the rolls.

Therefore, the frontage area hardly increases, and the suction effect does not become so large. Furthermore, in such a state, the running resistance of the filter cloth becomes very large, which not only requires a large drive horn, but also causes severe damage to the filter cloth. Furthermore, since tension also acts in the width direction of the corrugated cloth, it becomes necessary to increase the strength in the width direction in addition to strong polishing in the longitudinal direction. The above-mentioned phenomenon becomes more significant as the degree of pressure reduction increases.

The purpose of this invention is to solve the above-mentioned drawbacks of conventional solid-liquid separators, to provide a solid-liquid separator that has a large suction effect in the vacuum suction section, can prevent damage to the wave cloth, and has low running costs. It is on offer.

In order to achieve the above object, the present invention provides an endless wave cloth that is provided so as to be able to freely circulate in one direction on a fixed orbit;
It has a solid liquid supply section provided on the front side of the wave cloth, and a reduced pressure suction section provided on the back side of the wave cloth and facing the solid liquid supply section, and the reduced pressure suction sections are parallel to each other. a plurality of filter cloth guide rolls arranged in a row, and the guide rolls include:
A solid-liquid separation device is provided that is characterized by being a perforated cylindrical roll or a grooved roll.

To explain one embodiment of the solid-liquid separator of the present invention, FIG. 1 shows a so-called filter cloth traveling transfer type J]jl water.

FIG. 2 is a schematic side view of the machine, including a cross-sectional view.

In FIG. 1, 1 is stretched under tension between a drive roll 2 and three guide rolls 3.4.5, which will be described later. It is an endless wave cloth that travels and circles in the direction of the arrow on a fixed trajectory regulated by pressing rolls, transfer drums, draining rolls, etc.

The corrugated cloth 1 is stretched from the guide rolls 3 to 4 so as to have a slightly upward angle θ with respect to the horizontal plane. This angle θ is preferably in the range of 5 to 20' so that the liquid depth of the solid-liquid supply tank described later can be made as shallow as possible and the contact area between the solid-liquid and the wave cloth 1 can be increased.

The above wave cloth is, for example, Japanese Patent Application No. 57-93591, Mei.
It is preferable to use the one described in the book FF and Japanese Patent Application No. 1983-226384.

That is, at least, a knitted or woven fabric base material in which synthetic fiber multifilament with a single thread diameter of 0.1 to 10 μm is used for the weft threads arranged in the width direction of the filter cloth, and the weft threads of these base materials are mainly arranged in the circumferential direction. It is preferable that the wavy cloth 1 is raised to form a raised layer of ultra-III fibers having a thickness of 0.1 to 10 μm on the surface of the corrugated cloth 1, and the raised layer forms the 'a layer. In such a filter cloth, since the nap is performed in the circumferential direction, the nap lies in that direction, that is, it has directionality.

Therefore, when in use, the filter cloth 1 is stretched so that the nap faces in the opposite direction to the circumferential direction of the filter cloth 1.

6 is a solid-liquid supply tank (solid-liquid supply section) installed between the guide rolls 3 and 4 and on the surface side of the corrugated cloth 1. The tension angle θ of the filter cloth 1 is In order to prevent the solid-liquid supply tank 6 from becoming too deep and causing the solid-liquid to leak out, it is preferable that the depth is within the above range of 5 to 20'.

The back side of the filter cloth 1 is connected to an intake fan (not shown) via an intake lower at a position facing the solid-liquid supply tank 6, and the back side is connected to a water column 5'OOmm above the A filtrate receiving tank (reduced pressure suction section) 8 that can maintain a reduced pressure state is provided. This filtrate receiving tank 8 is equipped with a filtrate outlet 9. Further, a plurality of filter cloth guide rolls 16-0 are arranged in the upper opening.

As shown in FIG. 2, the opening of the filtrate receiving tank 8 has a rectangular shape that is vertically elongated in the direction of travel of the filter cloth (in the direction of the arrow), and forms a rectangular shape in the direction of travel of the filter cloth. A plurality of filter cloth guide rolls 10 are arranged parallel to the beans.

As shown in FIGS. 2 and 3, the filter cloth guide roll 10 has a cylindrical shape, and ball bearings 11 are fitted at both ends, and the ball bearings 11 rotate the filter cloth guide roll 10 around a support shaft 12. It can be installed freely. and,
This support shaft 12 engages with a U-shaped groove provided in the can liquid receiver N8.

Further, the filter cloth guide roll 10 is provided with a large number of holes 13 in a staggered manner. In other words, this filter cloth guide roll 10 is a cylindrical roll with holes.

A transfer drum 14 and a press roll 15 are provided between the guide roll 4 and the drive roll 2 so as to face each other. Further, a tree-shaped scraper 16 is provided opposite the surface of the transfer drum 14 .

17 and 18 are water spray nozzles for cleaning the filter cloth 1 from the back side and the front side, respectively. Further, a draining roll 19 is provided between the water spray nozzle 17, 18 and the guide roll 3 so as to come into contact with the surface of the filter cloth 1 and push the filter cloth 1 upward.

Now, to explain the operation of the above-mentioned dehydrator, a solid liquid containing solid components and liquid components is supplied from the solid liquid supply tank 6 onto the filter cloth 1 which is circulating in the direction of the arrow.

The liquid component in the supplied solid-liquid passes through the filter cloth 1 by gravity and by the vacuum suction provided by the filtrate receiver 8 and is collected in the filtrate receiver 8 .

At this point, since the filter cloth guide roll 10 is a cylindrical roll with holes, the inside of the filtrate receiving tank 8 is maintained at a desired degree of vacuum with a small amount of power. Moreover, this filter cloth guide roll 10 allows the filter cloth 1 to
runs stably without significant deflection.

The liquid components collected in the filtrate receiving tank 8 are discharged to the outside of the dehydrator through the discharge port 9. On the other hand, the components that have not passed through the filter cloth 1 are carried between the transfer drum 14 and the squeeze roll 15 as the filter cloth 1 runs, and are compressed to remove most of the liquid components contained therein. It is squeezed out and becomes what is called a solid component. This solid component is then transferred from the filter cloth 1 to the transfer drum 14.
is transferred onto the surface of the dehydrator, and is further scraped off by the scraper 16 and discharged outside the dehydrator.

The filter cloth 1 is then sprayed with a water spray nozzle 17.18.
It is cleaned from the front and back. Furthermore, the filter cloth 1 is subjected to re-polishing and dewatering after the liquid components from washing are squeezed out by a drain roll 9.

In the above, a so-called grooved roll, which is a hollow or solid roll with ring-shaped or spiral grooves cut on its surface, may be used as the filter cloth guide roll. In short, the filter cloth guide roll only needs to be provided with holes and grooves that form intake passages. The filter cloth guide roll may be directly supported by the filtrate receiving tank as shown in the embodiment, but it may also be supported by a separate construction frame attached to the 'a'a receiving tank.

In addition, in the above, the filter cloth guide rolls are divided into two groups 9 and arranged to form a V-shape in the running direction of the filter cloth, but one or more groups of filter cloth guide rolls are arranged in the running direction. It may also be arranged in a direction perpendicular to the opposite direction. However, if the V-shaped arrangement as shown in the embodiment is adopted, the filter cloth guide roll acts to spread the running filter cloth in the width direction, making it possible to run the filter cloth more stably. Therefore, it is preferable.

The water spray nozzle for cleaning the filter cloth may be installed only on the back side of the filter cloth.

Further, a plurality of filters may be arranged in a row in the width direction of the filter cloth, or may be arranged in multiple stages in the running direction. Further, the nozzle may be operated continuously or at desired intervals and for a desired length of time depending on the level of dirt on the filter cloth. Furthermore, the water supplied to this nozzle may be clean water, or the filtrate in the filtrate receiving tank may be used.

Furthermore, instead of providing a solid-liquid supply tank, a 6 m length or the like may be provided in this portion to supply the solid-liquid, or the solid-liquid may be directly supplied through a supply pipe or the like.

Furthermore, a drainer roll is not always necessary. Alternatively, an air nozzle may be provided to blow off the liquid components with compressed air.

In the above, a so-called transfer-type dehydrator has been described as an embodiment of the present invention, but the solid-liquid separator of the present invention is a so-called twin cross-type dehydrator that squeezes solid-liquid between two filter cloths with a scoop/υ. It may be a type dehydrator, or it may be a so-called filtration machine that does not have a squeezing mechanism.

The device of this invention can be used in a variety of applications. For example, it can be used to separate solid and liquid components contained in lake water or river water. In addition, sludge, scum, flocs, etc. generated by sewage treatment, such as so-called suspended sludge, such as surplus sludge produced as a by-product from activated sludge treatment equipment, and so-called fixed sludge, which is discharged from biofilm treatment equipment, Cleaning water, sludge, etc.
It can be used in cases such as M filtration, concentration, and dehydration.

Specifically, for example, sludge generated from water and sewage treatment,
Excess sludge generated from septic tanks, sludge generated from human waste treatment plants, scum generated from pressurized flotation operations, coagulated flocs and coagulated sediment flocs generated from industrial wastewater treatment,
It can be used to separate solid components and liquid components contained in backwash water from various filters such as sand filters. In addition, solid-liquid separation in various manufacturing industries such as paper pulp manufacturing, food manufacturing, sake brewing, miso manufacturing, etc.
For example, it can be used to recover valuable materials in chemical processes.

As explained above, since the solid-liquid separator of the present invention uses a perforated cylindrical roll or a grooved roll as the filter cloth guide roll in the vacuum suction section, the IF filter can prevent the filter cloth from bending.
Even if they are densely arranged to achieve this, the effective opening area of the reduced pressure suction section does not decrease to a large extent because the holes or grooves serve as intake passages.

Therefore, while running the filter cloth stably, a large suction effect can be obtained with low power cost, and running costs are reduced. In addition, since the frontage area is substantially reduced and the filter cloth guide rolls can be arranged closely, stable running of the filter cloth is guaranteed, and not only is there less damage to the filter cloth, but also the drive required for running Since less force is required, running costs can also be reduced. Furthermore, since a large suction effect can be obtained, the length of the vacuum suction section can be shortened, and the number of filter cloth guide rolls can therefore be reduced, reducing damage to the filter cloth due to contact with the rolls. Furthermore, since the filter cloth can be guided stably, the degree of vacuum in the vacuum suction section can be increased, and the solid-liquid separation efficiency is also improved.

[Brief explanation of drawings]

FIG. 1 shows an embodiment of the solid-liquid separator of the present invention.
FIG. 2 is a schematic plan view of a solid-liquid receiving tank, and FIG. 3 is a cross-sectional view showing essential parts of a filter cloth guide roll. 1: Filter cloth 2: Drive roll 3.4.5 Ni guide roll 13- 6: Solid-liquid supply tank (solid-liquid supply section) 7: Inlet port 8: 'A liquid receiving tank (decompression suction section) 9: Discharge port 10 : Filter cloth guide roll 11: Ball bearing 12: Support shaft 13: 1!1 Cloth guide roll hole 14: Transfer drum 15: Squeezing roll 16: Scraper 17.18: Water spray nozzle 19: Drainer roll Patent applicant Higashi Co., Ltd. 14- Figure 1 Ada

Claims (1)

[Claims] An endless filter cloth provided to be able to freely revolve in one direction on a constant orbit, a solid-liquid supply part provided on the front side of the filter cloth, and a solid-liquid supply part provided on the back side of the filter cloth and opposite to the solid-liquid supply part. and a vacuum suction section provided therein, the vacuum suction section comprising a plurality of filter cloth guide rolls arranged in parallel to n, and the guide rolls are cylindrical rolls with holes or grooved rollers. A solid-liquid separation device characterized by: