JP2002166111A - Solid-liquid separation apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently filter water to be treated containing a suspended substance and to make an apparatus small-sized and inexpensive. SOLUTION: A solid-liquid separation apparatus is equipped with a filter device A equipped with a filter body 1 wherein a plurality of flat plate-shaped hollow filter members 2 having filter media arranged at least on one outer surfaces thereof and having treated water discharge means provided to the outer peripheral parts thereof are superposed one upon another so as to leave an interval up and down between the filter members, a scraper 10 disposed to the hollow rotary shaft 11 piercing the center part of the filter body 1 in a spaced apart state to scrape off the cake layers formed on the outer surfaces of the filter media and the water gathering pipe 8 communicating with the treated water discharge means, and a storage tank B of water to be treated having an inflow port of water to be treated containing the suspended substance and an outflow port 26 and housing the filter device A.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a solid-liquid separation device,
In particular, wastewater or sludge generated in the water treatment process of waterworks, sewerage or human waste treatment, and industrial wastewater and general wastewater containing pollutants can be efficiently filtered, and the size and cost of the device can be reduced. This is the solid-liquid separation device.

[0002]

2. Description of the Related Art Conventionally, as a means for concentrating slurry-like sludge generated in a water treatment process of a water supply system or a sewer system, an apparatus having a cylindrical filtration drum provided in a sludge storage tank is disclosed in the following publication.

[0003] Japanese Patent Application Laid-Open No. 55-147114 discloses a solid-liquid separation device in which a cylindrical rotary screen is rotatably immersed in a suspension in a storage tank. Less than,
This device is referred to as conventional technology 1.

Japanese Patent Application Laid-Open No. 9-150200 discloses a solid-liquid separation device in which a washing nozzle is provided in a screen drum to detect a sludge level and perform water spray washing. Hereinafter, this device is referred to as Conventional Technology 2.

[0005] JP-A-12-202496 and JP-A-12-202497 disclose a solid-liquid separation device having a vertical cylindrical filter drum having a scraper therein. Hereinafter, this device is referred to as Conventional Technology 3.

[0006]

However, the above-mentioned prior art has the following problems.

In the prior art 1, the clogging of the filter medium is prevented by the rotation of the rotary screen. However, in practice, the clogging of the filter medium cannot be prevented without a scraper or a cleaning device.

In the prior art 2, washing is performed by spraying water from the inside of the screen drum. However, in order to prevent clogging, a large amount of water must be used under high pressure. Then, clogging cannot be completely prevented.

The prior art 3 is a cylindrical filter drum. Therefore, when the diameter of the drum is reduced and the number of filter drums is increased in order to increase the surface area of the filter medium, the number of mechanical parts increases. There is a problem that the site area increases if the size is increased.

As described above, any of the above-mentioned prior arts can perform efficient solid-liquid separation.
There was a problem with the maintenance and inspection of the equipment.

Accordingly, it is an object of the present invention to provide a solid-liquid separation apparatus which can efficiently filter sludge and can reduce the size of the apparatus because clogging of the filtration medium does not occur. .

[0012]

According to the first aspect of the present invention,
A filter having a filtration medium on at least one outer surface, and a plurality of flat hollow filtration members having a treated water discharge means on the outer periphery thereof, which are stacked one above the other at an interval above and below, and a central portion of the filtration body. A scraper provided on a hollow rotary shaft that penetrates and separates and scrapes a cake layer formed on the outer surface of the filtration medium, a filtration device including a water collection pipe communicating with the treated water discharge means, and a suspended substance. It has a feature that it has an inflow port and an outflow port of the to-be-treated water containing, and has a to-be-treated water storage tank that houses the filtration device.

According to a second aspect of the present invention, the filter device is
It is characterized by having washing means for blowing at least one of treated water and pressurized air onto the outer surface of the filtration medium.

[0014] According to a third aspect of the present invention, the filtration device is
It is characterized by having a backwashing means using at least one of treated water and pressurized air.

[0015] According to a fourth aspect of the present invention, in the above-mentioned filter device,
It is characterized by having a blade for scraping the cake scraped by the scraper to the outside of the filter.

According to a fifth aspect of the present invention, there is provided the filter device,
It is characterized by being tiltable.

[0017]

Next, an embodiment of the solid-liquid separation device of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic perspective view of the present invention, and FIG.
FIG. 3 is an exploded perspective view showing a filter device of the present invention, FIG. 3 is an exploded perspective view showing a filter device of the present invention, and FIG. 4 is an exploded perspective view showing a hollow filter member and a scraper of the present invention.
Is a perspective view showing an arrangement of a hollow filtration member, a scraper and a scraping blade of the present invention, FIG. 6 is a partial perspective view showing a water collecting pipe of the present invention, and FIG. 7 is a partial view showing a hollow rotary shaft of the present invention. It is a perspective view.

As shown in FIG. 1, the solid-liquid separation device of the present invention includes a filtration device A and a treated water storage tank B containing the filtration device A.

The filtering device A includes a filter 1, a treated water collecting pipe 8 and a scraper 10, which will be described later, but may include a scraping blade 15 and a washing nozzle 17 as necessary.

Hereinafter, the filter 1, the treated water collecting pipe 8, the scraper 10, the scraping blade 15, and the washing nozzle 17 will be described.
The filtering device A provided with is described with reference to FIGS. 1 to 7.

1 to 7, reference numeral 1 denotes a vertical filter. The filter body 1 is composed of a hollow filter member 2 for filtering water to be treated containing suspended substances from the outside to the inside by a head difference, which is vertically stacked at intervals.

Although filtration can be performed by using pressure or suction, it is preferable to perform filtration based on the head difference in consideration of equipment costs and operation costs.

The hollow filter member 2 has a predetermined thickness.
For example, it comprises a circular frame 3 and a filtration medium 4 fixed to the upper and lower surfaces of the frame 3. If the filtration medium 4 itself has high strength, the filtration medium 4 may be directly fixed to the frame 3, but it is soft like a filter cloth, a polymer, etc., and easily deformed by water pressure. In such a case, it is necessary to fix to the frame 3 via a reinforcing porous flat plate. The hollow filtration member 2 is divided by a partition plate 2A for each water collecting pipe mounting portion described later. Partition plate 2
A prevents deformation of the filtration medium 4 due to water pressure or the like, but is not necessary if this deformation does not cause any problem.

As the filtration medium 4, a filter cloth, a nonwoven fabric, a separation membrane (a microfiltration membrane, an ultrafiltration membrane, a reverse osmosis membrane, an ion exchange resin membrane, etc.) is used. For this purpose, it is preferable to use a filter cloth, a nonwoven fabric, or a microfiltration membrane that can pass at low pressure.

Since the upper and lower surfaces of the hollow filtration member 2 are used as filtration surfaces, the filtration area per unit volume can be increased. Further, as the diameter of the hollow filtration member 2 increases, the square of the diameter increases. Because the filtration area increases,
It is more advantageous in terms of filtration efficiency than a filter body in which the filtration area increases as the first power of the drum diameter as in the cylindrical filtration drum of the prior art 3. In addition, the shape of the hollow filtration member 2 may be rectangular, polygonal, etc. other than circular. The hollow filter members 2 are vertically stacked with a space therebetween via a spacer 5.

A ring-shaped water collecting pipe mounting portion 6 protrudes from a side surface of the hollow filtration member 2, and a treated water collecting pipe described later is inserted into the water collecting pipe mounting portion 6. As shown in FIG. 4, the hollow filtration member 2
The communication port 7 is also formed as a treated water discharge means communicating with the inside. Since the number of the water collecting pipes may be at least one, the number of the attaching parts 6 may be at least one. In this example, four water collecting pipes are provided at equal intervals also for reinforcing the hollow filtration member 2.

Reference numeral 8 denotes a treated water collecting pipe inserted into the collecting pipe mounting portion 6 of the hollow filtration member 2. Openings 9 are formed at intervals in the axial direction of the water collecting pipe 8 as shown in FIG. Communication opening 7 between opening 9 and water collecting pipe attachment 6
And are in agreement. Therefore, the treated water in each hollow filtration member 2 is collected in the water collecting pipe 8 through the communication port 7 and the opening 9. Each water collecting pipe 8 is connected to a treated water discharge pipe described later.

Reference numeral 10 denotes a scraper provided between the hollow filtration members 2 and fixed to a hollow rotary shaft to be described later and rotatable thereby. The scraper 10 is composed of a plurality of (two in this example) blades spirally arranged around the rotation axis. By the rotation of the scraper 10, the cake-like suspended substance adhered and deposited on the surface of the filtration medium 4 with the progress of filtration is removed while leaving a thickness corresponding to the gap between the scraper 10 and the filtration medium 4. Regarding this gap, any state from the zero gap state where the scraper 10 and the filtration medium 4 are in direct contact to the non-contact arbitrary gap state can be adopted. Make it narrow. On the other hand, if it is desired to lower the suspension concentration in the treated water, the gap may be widened.

Further, the thickness of the cake-like suspended substance deposited on the surface of the filtration medium 4 can be adjusted also by the rotation speed of the scraper 10. In other words, when the rotation speed is low, the frequency of removing the suspended substance by the scraper 10 decreases, so that the thickness of the deposited suspended substance increases. On the other hand, when the rotation speed is high, the frequency of removing the suspended substance increases. Therefore, the thickness of the suspended substance is reduced.

As the material of the scraper 10, metals, polymer materials, ceramics, etc. can be used.
It is preferable that the material has corrosion resistance to the water to be treated and has wear resistance in consideration of direct contact with the filtration medium 4.

The removal of the cake-like suspended matter by the scraper 10 may be carried out continuously or periodically.

Reference numeral 11 denotes a vertical hollow rotary shaft to which each of the scrapers 10 and a washing nozzle described later are fixed. The rotating shaft 11 penetrates the center of each hollow filter member 2 and rotates in the spiral direction of the scraper 10 by a driving unit 14 including a pulley 12 and a motor 13. The rotating shaft 11 and each hollow filtration member 2 are completely separated.

Reference numeral 15 denotes a scraping blade, which scrapes off the cake-like suspended substance adhered to the scraping side surface of the scraper 10 and scrapes it out of the space between the hollow filtration members 2. The tip of the scraping blade 15 rotates around a rotation axis 16 within a predetermined angle range along the surface on the scraping side of the scraper 10 as the scraper 10 rotates.

The scraping blade 15 may be configured such that a rotating means (not shown) provided with a cam mechanism is attached to a rotating shaft 16 so that the scraping blade 15 can be rotated by itself in accordance with the rotation of the scraper 10. Alternatively, the scraper 10 may be rotated with the rotation of the scraper 10. When the scraper 10 is rotated along with the rotation, the tip end of the scraping blade 15 is slid along the surface of the scraper 10 on the scraping side, and an elastic force is applied to the scraping blade 15 itself. The scraping blade 15 is attached to the scraper 10
To return to the original state when it comes off.

The scraping blade 15 and the scraper 10 are in contact with each other in terms of the effect of scraping out the cake-like suspended substance.
Non-contact may be used, but non-contact is preferable in consideration of wear of the material.

Reference numeral 17 denotes a cleaning nozzle provided between the hollow filtration members 2 as cleaning means for cleaning the outside of the filtration medium 4, as shown in FIGS. Cleaning nozzle 1
Numeral 7 sprays a fluid on the outer surface of each filtration medium 4 to remove the cake-like suspended substance adhering to the filtration medium 4 and restores the filtration function when the filtration medium 4 is clogged. As the cleaning fluid to be used, in addition to the treated water from the filter body 1, externally introduced water, cleaning chemicals, air, and the like can be used. However, in consideration of the effect of reducing operating costs, treated water, air, or treated water is used. Combination of water and air is desirable.

Since the cleaning fluid from the cleaning nozzle 17 needs to spread over the entire surface of the filtration medium 4, it is fixed to the rotating shaft 11 in the same manner as the scraper 10. The cleaning fluid is supplied to each cleaning nozzle 17 via the hollow rotary shaft 11. As shown in FIG. 7, by providing the nozzle holes 17A of the cleaning nozzle 17 vertically, the lower surface of the upper filtration medium 4 and the upper surface of the lower filtration medium 4 can be simultaneously cleaned.

Reference numeral 18 denotes a treated water tank for storing the treated water from the treated water discharge pipe 25, 19 denotes a first valve for opening and closing the treated water to the treated water discharge pipe 25, and 20 denotes a hollow rotary shaft 1
A second valve 21 for opening / closing the treated water to the first valve 21 is a third valve 22 for opening / closing the air to the treated water discharge pipe 25.
Is a fourth valve for opening and closing air to and from the hollow rotary shaft 11, 23 is a pump for treated water, and 24 is a compressor for air. In addition, in FIG.
Only a book is provided and is connected to the treated water discharge pipe 25. In addition, the first valve 19, the third valve 21, the treated water pump 23, and the air compressor 24 serve as a back washing unit.

The to-be-treated water storage tank B has an inlet 26 for the to-be-treated water containing the suspended substance and an outlet 27 for the concentrated solid, and accommodates at least one filtration device A. .

As shown in this example, the treated water storage tank B
May be provided exclusively for the filtration device A, but water supply, sewerage,
It is also possible to use existing tanks in the flow of night soil treatment, industrial wastewater treatment or general wastewater treatment.

According to the solid-liquid separation device of the present invention configured as described above, the water to be treated containing suspended substances is treated as follows.

As shown in FIG. 1, the water to be treated, such as sewage, injected into the treated water storage tank B from the inlet 26 flows into the filtration media 4 in each hollow filtration member 2 of the filter 1 due to a head difference. And filtered. In this way, the treated water flowing into each hollow filtration member 2 is stored in the treated water tank 18 from the treated water discharge pipe 25 via the water collecting pipe 8.

As the filtration proceeds, cake-like contaminants adhere to the filtration medium of each hollow filtration member 2. The adhered contaminants are scraped off by the scraper 10 rotating by the hollow rotary shaft 11, Together with the solid content of the polluted substance concentrated in the bottom of the treated water storage tank B. The cake-like contaminants adhering to the surface on the scraping side of the scraper 10 are scraped off by the scraping blade 15, scraped out from between the hollow filtration members 2, and settled at the bottom of the treated water storage tank B.

In this manner, the concentrated solid content settled at the bottom of the to-be-treated water storage tank B and the scraped cake-like pollutant are discharged from the outlet 27 out of the tank.

In order to wash the filter 1 with the washing nozzle 17, the second valve 20 is opened, and the treated water in the treated water tank 18 is supplied to each washing nozzle 17 via the hollow rotary shaft 11 by the pump 23. In this case, the fourth valve 22 is opened, and air may be supplied to each of the cleaning nozzles 17 via the hollow rotary shaft 11 by the compressor 24, or treated water and air may be used in combination.

On the other hand, in order to reversely wash the filter 1, the first valve 19 is opened, and the treated water in the treated water tank 18 is pressed into each hollow filtration member 2 via the water collecting pipe 8 by the pump 23. In this case, the third valve 21 is opened and the compressor 2
4, air may be press-fitted into each hollow filtration member 2 via a water collecting pipe 8, or treated water and air may be used in combination. As the backwashing fluid, in addition to treated water, externally introduced water, cleaning chemicals, air, etc. are possible, but in consideration of the effect of reducing operating costs, treated water, air or a combination of treated water and air. Is desirable.

As described above, the water to be treated containing the suspended substance is treated with high efficiency, and the filtration medium is backwashed and washed.

The above is an example in which the vertical filter 1 is installed vertically in the water storage tank B to be treated.
In order to promptly discharge the treated water from the inside, the filter body 1 may be installed to be inclined in the direction of the water collecting pipe 8. in this way,
By inclining the filter body 1, there is also an effect that the scraping effect of the cake-like pollutant by the scraper 10 and the scraping blade 15 is improved.

[0050]

As described above, the present invention has the following useful effects.

[0051] The cake-like contaminants adhered to the filtration medium are always reliably removed by the scraper, and the filter medium can be regularly backwashed and washed, so that clogging of the filtration medium hardly occurs. Therefore, long-time operation becomes possible, and high filtration efficiency is obtained.

In order to filter using a hollow filtration member combined in upper and lower multi-stages having filtration media on the upper and lower surfaces,
Since the filtration area can be increased and the amount of treated water per unit site area can be increased, the size of the apparatus can be reduced.

Since the water to be treated is filtered only by the head difference, no power is required other than rotation of the scraper and the washing nozzle, and pressurization of the washing fluid and the backwash fluid.
Cost reduction can be achieved.

[Brief description of the drawings]

FIG. 1 is a schematic perspective view of the present invention.

FIG. 2 is a perspective view showing a filtration device of the present invention.

FIG. 3 is an exploded perspective view showing a filtration device of the present invention, with a part omitted.

FIG. 4 is an exploded perspective view showing a hollow filtration member and a scraper of the present invention.

FIG. 5 is a perspective view showing an arrangement of a hollow filtration member, a scraper, and a scraping blade according to the present invention.

FIG. 6 is a partial perspective view showing a water collecting pipe of the present invention.

FIG. 7 is a partial perspective view showing a hollow rotary shaft of the present invention.

[Explanation of symbols]

 A: Filtration device B: Treated water storage tank 1: Filtration body 2: Hollow filtration member 2A: Partition plate 3: Frame body 4: Filtration medium 5: Spacer 6: Water collecting pipe attachment part 7: Communication port 8: Collection Water pipe 9: Opening 10: Scraper 11: Hollow rotating shaft 12: Pulley 13: Motor 14: Driving means 15: Scraping blade 16: Rotating shaft 17: Washing nozzle 17A: Nozzle port 18: Treatment water tank 19: First valve 20 : 2nd valve 21: 3rd valve 22: 4th valve 23: Pump 24: Compressor 25: Treated water discharge pipe 26: Inlet 27: Outlet

──────────────────────────────────────────────────続 き Continued on the front page (51) Int.Cl. ⁷ Identification symbol FI Theme coat ゛ (Reference) B01D 65/08 (72) Inventor Itaru Sakai 1-1-2 Marunouchi 1-chome, Chiyoda-ku, Tokyo Nippon Kokan Co., Ltd. F term (reference) 4D006 GA03 GA06 GA07 HA43 JA24A JA70A KC17 PB06 PB08 4D026 BA01 BA03 BB01 BC06 BD05 BD06 BE04 BF06 BF07 BF09 BF21

Claims (5)

[Claims] 1. A filter body comprising a plurality of flat hollow filtration members having a filtration medium on at least one outer surface and having a treated water discharging means on an outer periphery thereof, which are vertically stacked at intervals. A filtration device provided on a hollow rotating shaft penetrating the body at a distance therefrom, for scraping a cake layer formed on the outer surface of the filtration medium, and a water collecting pipe communicating with the treated water discharging means; And a solid-liquid separation device having an inflow port and an outflow port of the to-be-treated water containing a suspended substance, and having a to-be-treated water storage tank that houses the filtration device. 2. The solid-liquid separation device according to claim 1, wherein the filtration device has a washing unit that blows at least one of treated water and pressurized air onto an outer surface of the filtration medium. 3. The solid-liquid separation device according to claim 1, wherein the filtration device has a backwashing unit using at least one of treated water and pressurized air. 4. The solid according to claim 1, wherein the filter has a blade for scraping the cake scraped by the scraper to the outside of the filter. Liquid separation device. 5. The solid-liquid separation device according to claim 1, wherein the filtration device is tiltable.