JPS646894Y2 - - Google Patents

Description

[Detailed Description of the Invention] This invention relates to a solid-liquid separator, and more specifically, to a solid-liquid separator such as a filter cloth traveling type filter or a dehydrator.

Recently, short fibers are planted on the surface of a textile base material so as to be inclined in one direction to form a nap, or the base material is raised to create a nap, and the nap is used to form a filter layer. cloth was developed. Along with this, such a filter cloth is processed to be endless, and while the endless filter cloth is rotated in one direction on a fixed orbit, a solid liquid is supplied to the surface of the filter cloth, and the solid components in the solid liquid and the liquid are separated. So-called filter cloth running type filters and dehydrators (hereinafter collectively referred to as solid-liquid separators) have been developed to separate components. In such a solid-liquid separation device, in order to prevent clogging of the filter cloth and perform solid-liquid separation efficiently, solid components after filtration or dehydration are recovered from the filter cloth, and then the filter cloth is washed with a cleaning nozzle. I try to do that.

In the conventional solid-liquid separator, the cleaning nozzle is installed downstream of the drive roll of the filter cloth with respect to the running direction of the filter cloth. However, such conventional devices have drawbacks as explained below.

That is, in the conventional device described above, the cleaning nozzle is
It is installed downstream of the drive roll that pulls and drives the filter cloth with respect to the running direction of the filter cloth, that is, at a position where the filter cloth is not sufficiently tensioned. however,
In this position, the filter cloth is likely to be bent or wrinkled, the relative position of the cleaning nozzle may change, resulting in uneven cleaning, and a high cleaning effect cannot be obtained. In addition, a filter cloth that is not in a tensioned state does not open its eyes sufficiently, which further accelerates the reduction in cleaning effectiveness.

The purpose of this invention is to solve the above-mentioned drawbacks of conventional solid-liquid separators, and to provide a solid-liquid separator that has a large filter cloth cleaning effect and has high throughput and solid-liquid separation efficiency.

In order to achieve the above object, the present invention provides a solid-liquid separation device comprising an endless filter cloth stretched between a guide roll and a drive roll so as to be freely rotatable in one direction, a solid-liquid supply section provided on the front side of the filter cloth, a vacuum suction section provided on the back side of the filter cloth facing the solid-liquid supply section, and a filter cloth cleaning nozzle provided on the front side and/or back side of the filter cloth, the cleaning nozzle being provided immediately before the drive roll in the rotation direction of the filter cloth.

To explain one embodiment of the solid-liquid separator of this invention, FIG. 1 is a schematic side view with a sectional view taken into consideration, showing a so-called filter cloth running transfer type dehydrator.

In FIG. 1, reference numeral 1 is stretched between a drive roll 2, a wrapping roll 3, and two guide rolls 4, 5. , a transfer drum to be described later;
It is an endless filter cloth that runs and circles in the direction of the arrow on a fixed trajectory regulated by squeezing rolls, draining rolls, etc. The filter cloth 1 has a guide roll 4
5, it is stretched 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 degrees 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.

Preferably, the filter cloth is as described in, for example, Japanese Patent Application No. 57-93591 and Japanese Patent Application No. 57-226384. That is, at least, a knitted fabric or woven base material using synthetic fiber multifilament with a single yarn diameter of 0.1 to 10μ is used for the weft yarns arranged in the width direction of the filter cloth, and the weft yarns of the base material are mainly raised in the circumferential direction. It is preferable that the filter cloth 1 has a nap of ultrafine fibers with a thickness of 0.1 to 10 μm formed on the surface of the filter cloth 1, and the nap is used to form a filter layer. In such a filter cloth, since the nap is carried out 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 is directed in the opposite direction to the running direction of the filter cloth 1. As shown in Fig. 2, such a filter cloth is stitched together along the dotted lines to make it endless, and belts 6 with holes are attached to both ends of the filter cloth to adjust the phase of both ends in the width direction during running. , 7 are sutured. This belt with holes 6,
7 is adapted to engage with a pin provided on the guide roll 4 or 5.

The drive roll 2 has a step as shown in FIG. Thus, the convex portion of the drive roll 2 comes into contact with the filter cloth portion of the endless filter cloth. That is, this drive roll 2 drives the filter cloth 1 by friction. Therefore, the convex portion is made of a material with a high coefficient of friction, such as rubber.

8 is a solid-liquid supply tank (solid-liquid supply section) provided between the guide rolls 4 and 5 and on the surface side of the filter cloth 1.
It is. 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 8 from becoming too deep and solid-liquid leaking.

The back side of the filter cloth 1 is connected to an intake fan (not shown) through an intake port 9 at a position facing the solid-liquid supply tank 8, and the back side is reduced in pressure to a water column of 500 mm or more. A filtrate receiving tank (decompression suction unit) 10 is provided which can maintain the filtrate. The filtrate receiving tank 10 is equipped with a filtrate outlet 11. In addition, a plurality of filter cloth guide rolls 12 are arranged side by side at the upper suction port.

A transfer drum 13 and a press roll 14 are provided between the guide roll 5 and the drive roll 2 so as to face each other. In addition, the transfer drum 13
A wedge-shaped scraper 15 is provided opposite to the surface of.

16 is a water spray nozzle (washing nozzle) for washing the filter cloth 1 from the surface side, that is, from the filter layer side. This spray nozzle 16 is connected to the drive roll 2
and the squeeze roll 14 in front of it, that is, the filter cloth 1
It is provided immediately before the drive roll 2 with respect to the running direction of the filter cloth 1 (on the upstream side of the drive roll 2 with respect to the running direction of the filter cloth 1). A filter cloth pressing plate 17 made of a stainless steel plate, a vinyl chloride plate, an aluminum plate, etc. is provided on the back side of the filter cloth 1, facing the water spray nozzle 16.

Further, a winding roll 3 is provided between the drive roll 2 and the guide roll 4 for adjusting the winding angle of the filter cloth 1 with respect to the drive roll 2, and further between the winding roll 3 and the guide roll 4. filter cloth 1
A drain roll 18 is provided 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 dehydrator described above, a solid liquid containing a solid component and a liquid component is supplied from the solid liquid supply tank 8 onto the filter cloth 1 which is running 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 10 and is collected in the filtrate receiver 10 . At this time, although the filter cloth 1 is receiving a large force due to suction, the filter cloth guide roll 12
It runs stably due to the action of

The liquid components collected in the filtrate receiving tank 10 are discharged to the outside of the dehydrator through the discharge port 11. On the other hand, the components that did not pass through the filter cloth 1 are carried between the transfer drum 13 and the squeeze roll 14 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 13.
is transferred onto the surface of the dehydrator, and is further scraped off by the scraper 15 and discharged outside the dehydrator.

The filter cloth 1 is then cleaned from its surface by means of a water spray nozzle 16. At this time, the filter cloth 1 at this position is under a large tension due to the traction force of the drive roll 2, so its running condition is very stable, and the eyes are often open, so the filter cloth 1 is stable. Moreover, efficient cleaning can be performed. In addition, since the filter cloth pressing plate 17 is provided on the back side of the filter cloth 1, even if the pressure of the washing water is increased in order to further improve the washing efficiency, the filter cloth 1 will not bend significantly. do not have.

Next, the liquid component of the filter layer from washing is squeezed out of the filter cloth 1 by a drain roll 18, and the filter cloth 1 is subjected to the next dewatering process.

In the above embodiment, the wrapping angle of the filter cloth with respect to the drive roll, that is, the traction force of the filter cloth, can be adjusted to an appropriate value by changing the position of the wrapping roll, but the wrapping angle may be large. The bigger the better. Normally, the angle is selected to be 100° or more.

Regarding the material of the drive roll, any material may be used as long as it has a high coefficient of friction with the filter cloth, but synthetic rubber or the like is usually used.

The filter cloth guide roll may be a cylindrical roll with a smooth surface, but it may also be a so-called perforated cylindrical roll in which a large number of holes are bored in such a cylindrical roll, or a cylindrical or solid roll with a surface such as When so-called grooved rolls with ring-shaped or spiral grooves are used, even if the rolls are closely arranged, the holes and grooves act as intake passages, so the actual opening area of the suction port does not decrease significantly. It is now possible to obtain a high degree of vacuum with less power, which not only further increases solid-liquid separation efficiency and processing capacity, but also
This is preferable because running costs are also lower.

In addition, the filter cloth guide rolls are arranged in at least two groups in the width direction of the filter cloth, and the roll arrangement as a whole becomes a V-shape in the running direction of the filter cloth. It is preferable to arrange the rolls so as to face slightly outward, since the rolls act to spread the running filter cloth in the width direction, and the filter cloth runs more stably.

The water spray nozzle may be installed on the back side of the filter cloth, or on both the front and back sides. 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.

A filter cloth presser plate is not always necessary, but
Providing this is preferable because even if the pressure of the washing water is increased, the filter cloth will not bend much and the washing effect will be further improved.

Further, instead of providing a solid-liquid supply tank, a gutter 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 this invention.
The solid-liquid separator of this invention may be a so-called twin-cross type dehydrator that squeezes the solid-liquid between two filter cloths, or it may be a so-called filtration machine that does not have a squeezing mechanism. It is something.

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, so-called suspended sludge, such as surplus sludge produced by activated sludge treatment equipment,
It can be used for filtering, concentrating, and dewatering sludge, scum, floc, wash water, sludge, etc. generated in sewage treatment, such as so-called fixed sludge discharged from biofilm treatment equipment. 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 pressure flotation operations, and flocs generated from industrial wastewater treatment. It can be used to separate solid components and liquid components contained in backwash water of various filters such as flocculation flocs and sand filters. Also,
For example, paper pulp manufacturing, food manufacturing, alcoholic beverage manufacturing,
It can be used for solid-liquid separation in various manufacturing industries, such as the brewing industry of miso, and for the recovery of valuable materials in chemical processes.

As explained above, the solid-liquid separator of this invention has a cleaning nozzle for the filter cloth that is less likely to bend or wrinkle because the filter cloth is in a relatively tensioned state. Since it is located just before the drive roll in the circumferential direction of the filter cloth, it can prevent insufficient cleaning or uneven cleaning, resulting in a great cleaning effect. be able to. Therefore, since clogging of the filter cloth is prevented, the device of this invention has high solid-liquid separation efficiency and processing capacity.

Additionally, if a filter cloth presser plate is provided opposite the cleaning nozzle, the filter cloth will not bend significantly even if the jetting pressure of the cleaning water is increased, making it possible to obtain even greater cleaning effects. .

Furthermore, if a perforated cylindrical roll or a grooved roll is used as the filter cloth guide roll installed in the vacuum suction section, it is also possible to arrange it closely to prevent the filter cloth from deflecting in the vacuum suction section. Since the holes or grooves serve as intake passages, the actual opening area of the vacuum suction section does not decrease to a large extent. Therefore, while running the filter cloth stably, a large vacuum suction effect can be obtained with low power cost, and higher solid-liquid separation efficiency and processing capacity can be obtained with low running cost.

[Brief explanation of the drawing]

Fig. 1 is a schematic side view including a cross-sectional view showing an embodiment of the solid-liquid separation device of this invention for a dehydrator, Fig. 2 is a schematic perspective view showing an endless filter cloth, and Fig. 3 is a dehydrator. It is a schematic perspective view which shows a drive roll. 1: filter cloth, 2: drive roll, 3: wrapping roll,
4, 5: Guide roll, 6, 7: Belt with holes,
8: Solid-liquid supply tank (solid-liquid supply section), 9: Intake port, 1
0: Filtrate receiving tank (decompression suction part), 11: Discharge port, 1
2: Filter cloth guide roll, 13: Transfer drum, 14:
Press roll, 15: Scraper, 16: Water spray nozzle (cleaning nozzle), 17: Filter cloth presser plate, 1
8: Mizukiri roll.

Claims (1)

[Scope of utility model registration request] An endless filter cloth stretched between a guide roll and a drive roll so as to be able to rotate freely in one direction, a solid-liquid supply section provided on the front side of the filter cloth, and a solid-liquid supply section provided on the back side of the filter cloth. and a filter cloth cleaning nozzle provided on the front side and/or the back side of the filter cloth, and the cleaning nozzle is arranged so as to face the filter cloth in the circumferential direction of the filter cloth. A solid-liquid separator characterized in that it is provided immediately before a drive roll.