JPS6044010A - Solid-liquid separation apparatus - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a solid-liquid separator, and more particularly to a solid-liquid separator such as a filter cloth traveling type filter or a dehydrator.

Recently, short T
A filter cloth has been developed in which raised fibers are formed by flocking IN or by raising the base material, and the raised fibers form a cline layer. Along with this, such a corrugated cloth is endlessly processed, and the solid liquid is supplied to the surface of the filter cloth while the end-one-nos filter cloth is rotated in one direction on a constant orbit, and the solid components in the solid liquid are determined. So-called filter cloth running type filters and dehydrators that separate liquid components (hereinafter referred to as solid-liquid separators)
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, and the The liquid component in the solid-liquid is sucked to facilitate its passage. Such a vacuum suction unit is maintained at a fairly high vacuum state, such as 500 mml above the water column, so that the wave cloth is pulled by a large force due to the suction force.

The conventional solid-liquid separator is equipped with a vacuum suction section that has a rectangular suction 910 with a constant width in the traveling direction of the corrugated cloth, and has a plurality of suction ports at the suction port for preventing deflection of the corrugated cloth due to the suction force. Filter cloth guide rolls of a certain length corresponding to the width of the suction port are arranged in parallel to each other.

However, such conventional solid-liquid separation devices have drawbacks as explained below.

In other words, if filter cloth guide rolls of a certain length are arranged according to the shape of the suction port of a certain width, the ends of all the rolls will come into contact with the same position of the filter cloth. Therefore, in combination with the strong suction force applied to the filter cloth, the filter cloth wears out in a linear manner near the contact position marked ``-'', that is, near both ends in the width direction where it constantly contacts the end of the roll, and this part wears out. It's coming.

In severe cases, holes may be left. If this happens, not only will the solid-liquid separation t11 performance decrease by one level, but it will also become impossible to maintain the desired degree of pressure reduction, resulting in a significant drop in processing capacity.

On the other hand, since the part that comes into contact with the end of the n-ru is always the same, it is conceivable to reinforce only that part with another member with excellent wear resistance. However, if this happens, it will become difficult for liquid components to pass through the reinforced portion, reducing processing capacity.

The purpose of this invention is to solve the above-mentioned deficiencies of conventional solid-liquid separators, and to minimize damage to the filter cloth caused by the vacuum suction section without reducing solid-liquid separation (/1 performance or processing capacity). , a solid-liquid separator that can dramatically extend the life of filter cloth is being developed.

In order to achieve the above object, the present invention includes a T-less filter cloth that is arranged to freely revolve in one direction on a constant orbit, a solid-liquid supply section provided on the surface side of the filter cloth, and a a vacuum suction section provided on the back side of the cloth and facing the solid liquid supply section, the vacuum suction section having a suction port that widens toward the running direction of the filter cloth; The suction port is provided with a solid-liquid N1 pack d, which is characterized in that a plurality of filter cloth guide rolls are arranged in accordance with the shape of the filter cloth expanding toward the end.

To explain one embodiment of the solid-liquid separation device of the present invention, FIG. 1 shows a so-called filter cloth traveling type transfer device. FIG. 2 is a schematic side view including a cross-sectional view showing a dehydrator.

In FIG. 1, 1 is stretched under tension between a drive roll 2 and a guide roll 3.4.5 of 3β1. This is a J-less filter cloth that runs and circles in the direction of the arrow on a fixed track regulated by a transfer drum, drain roll, etc.

1. The filter cloth 1 is stretched toward the guide roll 3 or 64 so as to have an angle θ slightly toward the horizontal plane. This angle θ is preferably in the range of 5 to 200 so that the liquid depth of the solid-liquid supply tank to be described later can be made as shallow as possible and the contact area between the solid-liquid and the filter cloth 1 can be increased.

It is preferable that the filter cloth described in Japanese Patent Application No. 57-93591 and Japanese Patent Application No. 57-226384 be used.

That is, at least the weft yarns arranged in the width direction of the filter cloth are made of a knitted or woven fabric base material using synthetic 1#lt multifilament with a single yarn diameter of 0.1 to 10μ, and the weft yarns of these base materials are mainly used. It is preferable that the surface of the filter cloth 1 has ultra-fine naps of 0.1 to 10 μm in thickness, which are raised in the circumferential direction, and the naps form various layers.

This type of filter cloth is raised in the circumferential direction, so
The erect hair lies in that direction, which means it has directionality.

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

5-6 is between the guide rolls 3 and 4 and the cloth 1 written in 1.
This is a solid-liquid supply tank (solid-liquid supply section) provided on the surface side. The tension angle θ of the filter cloth 1 is preferably in the range of 5 to 20° in order to prevent the solid-liquid supply tank 6 from becoming too deep and solid-liquid leaking. .

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 an intake fan (not shown) with a water column of 50 mm (in a reduced pressure state of 1 mm or more). A filtrate receiving tank (decompression suction unit) 8 is provided which can be placed on the surface of the tank. A plurality of filter cloth guide rolls 10 are arranged side by side.

As shown in FIG. 2, the suction port of the filtrate receiving tank 8 has a shape that widens towards the running direction of the filter cloth (in the direction of the arrow), and has a plurality of filter cloth guide rolls divided into three groups. 10 is
As a whole, they are arranged in parallel to each other in accordance with the shape that widens toward the end.

The filter cloth guide roll 10 has a cylindrical shape as shown in FIG. 2 and FIG.
It is rotatably mounted on the support shaft 12. And this support shaft 12 is il! Installed in liquid receiving tank 8 [
- is engaged with the IJ-shaped groove.

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 perforated cylindrical roll.

A transfer drum 14 and a press roll 15 are installed 1 between the guide []-rule 4 and the drive roll 2, facing H. )1: A tree-shaped scraper 1G is provided opposite the surface of the transfer drum 14.

17 and 18 are water spray nozzles for washing the filter cloth 1 from the center 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 away in the opposite direction.

Now, to explain the above-mentioned DI2 water machine 0 action, the solid liquid supply tank 6f) s r
A solid-liquid containing a solid component and a liquid component is supplied.

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 time, since the filter cloth guide roll 10 is a cylindrical roll with holes, the inside of the filtrate receiving tank 8 can be maintained at a desired degree of vacuum with less power. Moreover, this filter cloth guide roll 10 allows the filter cloth 1 to
Despite being subjected to suction force, it runs stably without significantly flexing.

The liquid components collected in the filtrate receiving tank 8 are
It is discharged to the outside of the dehydrator from port 9. On the other hand, the components that have not passed through the filter cloth 1 are transferred to the transfer drum 14 as the filter cloth 1 moves.
It is conveyed between the rollers 15 and 15, and is compressed to squeeze out most of the liquid components contained therein, resulting in what is called a solid component. This solid component is then transferred from the filter cloth 1 to the transfer drum 17! I and the scraper 16
It is scraped off 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 dehydration again after the liquid components from washing are squeezed out by a draining roll 9).

In the above example, the suction port of the vacuum suction section has a shape in which the width increases monotonically in the running direction of the filter cloth, but the width of the suction port increases in a quadratic curve. It may be increased gradually, or it may be increased stepwise.

In short, when viewed as a whole, it is sufficient that the filter cloth has a shape that widens toward the end in the running direction of the filter cloth.

In the above, the filter cloth guide rolls are arranged in three groups, but they may be 111Y or 2 flY. However, as shown in the embodiment, if the rolls are divided into 1 and 3 groups and arranged so that the two groups of rolls located on the outside face slightly outward, the two groups of rolls on the outside cover the filter cloth while it is running. This is preferable because it acts to spread the filter cloth in the width direction, allowing the filter cloth to run stably in the Jζ direction. Such a so-called V-shaped arrangement can also be obtained by using two groups of rolls.

As the filter cloth guide roll, it is preferable to use a cylindrical roll with holes as shown in the embodiment, or a so-called grooved roll in which a ring-shaped or spiral groove is cut on the surface of a solid roll. . When using perforated cylindrical rolls or grooved rolls, even if the rolls are closely arranged, -
Since the holes and vortex act as an intake passage, the actual opening area of the suction port does not decrease too much, making it possible to obtain a high degree of pressure reduction with less power, improving solid-liquid separation performance and processing. Not only will your excitement increase, but your running costs will also become cheaper. However, in the present invention, a solid roll may be used instead of such a cylindrical roll with holes or a roll with grooves. 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 filtrate receiving tank.

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. The nozzle closes in the middle of the day! It may be operated continuously, or it may be operated at desired intervals and for a desired period of time depending on the state of dirt on the filter cloth. You may also do so. Furthermore, the filtrate supplied to this nozzle may be clean water, or the filtrate in the il&l liquid receiving tank may be used.

Also, instead of adding 8Q of solid-liquid IHA supply tank, 1
The solid-liquid may be supplied by providing a passage or the like, or it may be directly supplied through a supply pipe or the like.

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

In the following, 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 in which a solid-liquid is squeezed between two pieces of corrugated cloth. It may be a filter, or it may be a so-called filter that has a throttle mechanism or not.

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. Also,
Suspended sludge, such as surplus sludge produced by activated sludge treatment equipment, and discharged from biofilm treatment equipment,
It can be used for filtering, concentrating, and dewatering sludge, scum, flocs, wash water, sludge, etc. generated by sewage treatment, such as so-called fixed sludge.

In terms of page format, we can trace the sludge produced by water and sewage 91j 11p, the excess sludge generated from septic tanks, and the original yI!
Sludge generated from the field, scum generated from pressurized flotation operations,
Coagulated flocs produced by industrial wastewater treatment, coagulated and precipitated flocs, and sand filters'Alff11. x Can be used to separate solid components and liquid components contained in backwash water of various types of filters. In addition, it can be used for recovering solid-liquid components in various manufacturing industries such as paper pulp manufacturing, food IIIJ manufacturing, sake brewing, and miso brewing, and for recovering valuable materials in chemical processes.

As explained above, in the solid-liquid separator of the present invention, the shape of the suction port of the vacuum suction section is widened toward the running direction of the wave cloth, and the shape is 1! Since the filter cloth guide rolls are arranged in such a manner that the ends of the rolls come into contact with the corrugated cloth with a spread width corresponding to the extent of the end spread, the ends of the rolls come into contact with the corrugated cloth with a spread width corresponding to the degree of spread. Only one portion 11'I does not abut linearly. Therefore, damage to the filter cloth can be suppressed, and not only the life of the filter cloth is dramatically increased, but also high IMI'a separation performance and processing capacity can be maintained for a long period of time. In addition, since the shape of the suction port is flared toward the end, the edge of the suction port is less likely to be damaged by treating the filter cloth in a linear manner.

Also, a cylindrical roll with holes or a grooved roll can be used as a filter cloth guide roll.
11) When filter cloths are used, even if they are arranged closely to prevent deflection of the filter cloth in the vacuum suction section, the holes or grooves serve as intake passages, so the actual The opening area of No. 1 does not decrease significantly. Therefore, while running stably on wave cloth, a large suction effect can be obtained with a small U1 power cost, thereby reducing running costs. Furthermore, since the filter cloth guide rolls can be arranged densely without substantially reducing the frontage area, stable running of the filter cloth is guaranteed, and not only is damage to the filter cloth reduced, but also Since less driving force is required, running costs can be reduced in this respect as well. 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, further 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 is a schematic side view including a sectional view showing an embodiment of the solid-liquid separator of the present invention for a dehydrator, FIG. 2 is a schematic plan view of a solid-liquid receiving tank, and FIG. 3 is a filter FIG. 3 is a sectional view showing a main part of the cloth guide roll. 1: Filter cloth 14- 2: Drive roll 3.4.5 Ni guide roll 6: Solid-liquid supply tank (solid-liquid supply part) 7: Intake port 8: ILJ liquid receiving tank (decompression suction part) 9: Outlet port 10: i [! l Cloth guide roll 11: Ball bearing 12: Support shaft 13: Hole in filter cloth guide roll 14: Transfer drum 15: Squeezer 1]-ru 16: Scraper 17.18: Water streak 1 No nozzle 19: Drainer roll Patent applicant Higashi Shi Co., Ltd. Net 15- 1st! Figure 3

Claims (1)

[Scope of Claims] An endless filter cloth provided so as to be able to freely revolve in one direction on a constant orbit, a solid-liquid supply section provided on the front side of the wave cloth, and a solid-liquid supply section provided on the back side of the filter cloth and the solid liquid supply section provided on the back side of the filter cloth, and and a reduced pressure suction section provided opposite to the liquid supply section, the reduced pressure suction section is provided with a suction port that widens towards the running direction of the filter cloth, and the suction port of the hood has a plurality of suction ports. A solid-liquid separator characterized in that a filter cloth guide roll is arranged in accordance with the shape of the filter cloth expanding toward the end.