JP2013078745A - Filtering device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a filtering device using a coil filter, capable of lessening an installation area despite a large treatment amount and further of efficiently discharging the suspended matters when cleansing.SOLUTION: The filtering device is provided with: a plurality of coil filters which are disposed vertically and connected in parallel; a container housing the plurality of coil filters in the same reception part; and an inclined plate which is arranged to have a clearance between the vertically disposed coil filter and the lateral inner peripheral face of the container and has a surface inclining below toward the above inner peripheral face.

Description

  The present invention relates to a filtration device.

As a device for removing suspended matter in drainage, water and sewage, and other liquids, a filtration device that filters using various filter media is used.
As such a filtering device, for example, Patent Literature 1 and Patent Literature 2 describe a filtering device including a coil filter as a filtering material.

  The coil filter is obtained by winding a linear member made of metal or the like in a coil shape without a gap. In a filtering device using such a coil filter, a plurality of the coil filters are suspended in a container. It is stored in a state.

Such a filtration device allows water to be treated to pass through the gap between the linear members from the outside of the coil filter to the inside of the coil filter, that is, the space inside the coil body formed by the coil filter. Thus, the suspension in the water to be treated can be removed.
Moreover, in such a filtration apparatus, the treated water passed through the inside of the coil filter is discharged as treated water from one end of the coil filter.

When the water to be treated is treated as described above, the suspension adheres to the surface of the coil filter on the treated water introduction side of the coil filter. Need to be cleaned.
In the washing of the coil filter, the suspension is removed from the outer surface of the coil filter by performing so-called reverse washing in which washing water is passed from the treated water discharge side of the coil filter toward the treated water introduction side. .
Since the suspension removed from the coil filter by such back washing settles downward due to its own weight inside the filtration device, in order to discharge the suspension from the filtration device, the suspension is placed below the filtration device. A discharge port for discharging is provided (Patent Document 2).

On the other hand, in order to increase the processing amount in the filtration device, it is conceivable to arrange a plurality of coil filters in the same container to increase the filtration area.
However, when arranging a plurality of coil filters in the same container, it is not preferable to arrange the coil filters in the horizontal direction because the installation area of the entire apparatus becomes large.

In order to reduce the installation area of the apparatus, it is conceivable to arrange a plurality of coil filters in the vertical direction in the same container.
However, when a plurality of coil filters are arranged in the vertical direction, the suspension flows downward from above in the container at the time of washing as described above, so that the suspension adheres to the lower coil filter. Thus, the downward flow of the suspension may be blocked by the lower coil filter. Therefore, the suspension may not be discharged efficiently.

In particular, a filter aid containing diatomaceous earth or the like may be attached to the outer surface of the coil filter in order to improve the filtration accuracy.
When such a filter aid is attached to the coil filter, the filter aid is also removed from the coil filter along with the suspension during washing, so the suspension with the filter aid attached is discharged from the container. There is a need to.
Therefore, since the amount of the suspended matter to be discharged increases, it is particularly difficult to discharge the suspended matter if the coil filter is arranged in the vertical direction.

Japanese Patent Application Laid-Open No. 07-10608 JP 2006-272251 A

  Therefore, in view of the above problems, the present invention provides a filtration device using a coil filter, which can reduce the installation area instead of the processing amount, and can efficiently discharge suspension during washing. Is an issue.

  The filtration device according to the present invention includes a plurality of coil filters arranged in the up-and-down direction, a container that houses the plurality of coil filters in the same containing portion, and the coil filter arranged in the up-and-down direction. And an inclined plate that is disposed so as to have a gap between the inner peripheral surface of the side and has a surface that is inclined downward toward the inner peripheral surface of the side of the container.

According to such a configuration, when washing the coil filter arranged in the vertical direction in the same container, the suspension removed from the coil filter arranged above is the coil arranged below the coil filter. The inclined plate disposed between the filter and the filter can be moved downward without adhering to the lower coil filter.
Thus, the suspension can be efficiently discharged from the container.

  In the present invention, a water collecting member for collecting treated water filtered by the lower coil filter is disposed on the upper part of the lower coil filter of the coil filters disposed in the vertical direction, It is preferable that the upper part of the water collecting member is formed as the inclined plate.

  In such a case, it is not necessary to provide the inclined plate and the water collecting member separately, and thus the filtration device can be further downsized.

  In the present invention, there is provided a gas dispersion that is located at a position facing or above the inclined plate and projecting from the inner peripheral surface of the side of the container toward the center of the container. Preferably it is.

  In such a case, when the gas is introduced into the container from the bottom of the container for the purpose of cleaning or the like, the gas flows between the gas dispersion and the inclined plate so that the gas is introduced to the inner peripheral surface side of the container. The gas can be uniformly guided to the upper coil filter side without concentration.

  In the present invention, the plurality of coil filters includes a coil filter portion arranged in the horizontal direction, the coil filter portions are arranged in a plurality of steps in the vertical direction, and the inclined plate is arranged in the vertical direction. It is preferable that it is provided between the coil filter parts arranged in the.

  In such a case, in the filtration device in which the amount of processing can be further increased by arranging the coil filter portion in which a plurality of coil filters are arranged in the horizontal direction so as to form a step in the vertical direction, Suspension removed from the upper coil filter unit adheres to the coil filter of the coil filter unit disposed below by the inclined plate provided between the coil filter unit and the lower coil filter unit. The suspension can be efficiently discharged from the container.

  According to the present invention, in a filtration apparatus using a coil filter, an installation area can be reduced instead of a processing amount, and a suspended matter can be efficiently discharged during cleaning.

Sectional drawing which shows a part of filtration apparatus which concerns on one Embodiment of this invention. The schematic diagram which shows the filtration apparatus which concerns on one Embodiment of this invention. (A) Sectional drawing which shows a part of filtration apparatus which concerns on other embodiment of this invention, (b) Partial sectional view which shows a part of filtration apparatus which concerns on other embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings.

Hereinafter, the filtration device 10 according to the present embodiment will be described with reference to FIGS. 1 and 2.
The filtration device 10 of the present embodiment includes a plurality of coil filters arranged in the vertical direction and connected in parallel, a container 11 that houses the plurality of coil filters in the same housing portion, and the coil filters arranged in the vertical direction. And an inclined plate having a surface which is disposed so as to have a gap with the inner peripheral surface 11a on the side of the container 11 and is inclined downward toward the inner peripheral surface on the side of the container. The filter 1 provided is included.

  The said filter 1 is a filter which uses the to-be-processed water introduced from the to-be-processed water tank 20 in which the to-be-processed water is stored filter a suspended substance with the said several coil filter, and makes it a treated water.

The filter 1 includes first and second coil filter portions 1a and 1b in which a plurality of coil filters are respectively arranged in the lateral direction at two locations (two stages) above and below the inside of the container 11. Yes.
That is, the first coil filter portion 1 a disposed below and the second coil filter portion 1 b disposed above the first coil filter portion 1 a form a step in the same accommodating portion in the container 11. Are stored up and down.

The container 11 has a substantially cylindrical shape, and a treated water introduction port 12 for introducing treated water and a backwash water discharge port 13 are opened at a lower portion of the container 11.
In the upper part of the container 11, a treated water discharge port 14 for discharging treated water treated by each coil filter is opened.

As the coil filter used in the present embodiment, a conventionally known coil filter such as a coil filter wound in a coil shape in a state in which a metal linear member such as stainless steel is closely attached without gap is used.
The coil filter is wound with the linear member in close contact as described above at the time of filtration. When the coil filter is washed, the close contact of the linear member is loosened to create a gap between the linear members. It is comprised so that it can be made.

If necessary, a filter aid may be attached to the coil filter.
As the filter aid, a known filter aid that can adhere to the surface of the coil filter and improve the filtration accuracy can be used.
For example, depending on the type of suspension contained in the water to be filtered from known filter aids such as diatomaceous earth, diatomaceous powder mixed with pulp powder, activated carbon, etc., and the target filtration accuracy. Can be selected as appropriate.

In the first and second coil filter portions 1a and 1b, the coil filters are respectively connected to the disk-shaped upper fixing portions 19a and 19b provided on the upper portions of the first and second coil filter portions 1a and 1b, respectively. The upper end of the coil filter is fixed in an open state.
Above each upper fixing part 19a, 19b, a first water collecting part 15a and a second water collecting part 15b are formed for collecting treated water filtered by each coil filter.

  The treated water discharge port 14 is opened in the second water collecting portion 15b.

  The number of coil filters included in the first and second coil filter portions 1a and 1b is not particularly limited. In the present embodiment, the first coil filter portion 1a includes 19 coil filters. The second coil filter portion 1b includes 18 coil filters.

In the central part of the second coil filter part 1b, a water collecting pipe 16 for transferring the treated water treated by the first coil filter part 1a to the second water collecting part 15b is arranged instead of the coil filter. .
Accordingly, the coil filter of the second coil filter portion 1b is arranged one less than the coil filter of the first coil filter portion 1a.

A water collecting member 17 is attached to the upper part of the first coil filter portion 1a so as to close the upper portion of the first water collecting portion 15a.
The water collecting member 17 has a top plate 2 having an inverted conical shape at the top.
That is, the upper surface plate 2 of the water collecting member 17 is formed on the water collecting member 17 as a surface inclined downward from the central portion of the container 11 toward the inner peripheral surface 11a on the side of the container. In the filtering apparatus, the upper surface plate 2 is formed as the inclined plate.

The upper surface plate 2 is configured to cover the upper surface portion of the first coil filter portion 1a and not to contact the inner peripheral surface 11a on the side of the container 11.
That is, a gap is formed between the upper surface plate 2 and the inner peripheral surface 11a on the side of the container 11 so as to generate a water flow.

The lower end of the water collecting pipe 16 is open to the upper end of the water collecting member 17.
That is, the first water collecting portion 15a is a space portion surrounded by the upper fixing portion 19a to which the coil filter of the first coil filter portion 1a is fixed and the water collecting member 17, and The second water collecting part 15 b is communicated with the water collecting pipe 16.

The filtration device 10 of the present embodiment may be provided with a gas dispersion 18 as necessary.
The gas dispersion 18 is an inner peripheral surface 11 a on the side of the container 11, a position facing the water collecting member 17, or a position above it, and an inner peripheral surface on the side of the container 11. To the center of the container 11.
In the present embodiment, the gas dispersion 18 is provided on a side inner peripheral surface 11 a of the container 11 at a position facing the water collecting member 17.

When viewed from the upper surface of the container 11, the gas dispersion 18 is an annular body having an opening that opens in the vertical direction at the center, and the upper surface 18 a of the gas dispersion 18 is formed inside the container 11. It inclines upward toward the peripheral surface 11a.
The lower surface 18b of the gas dispersion is inclined upward from the inner peripheral surface 11a of the container 11 toward the central portion.
The gas dispersion 18 is disposed so that the lower surface 18b of the gas dispersion 18 and the upper surface plate 2 of the water collecting member 17 are opposed to each other with a gap that allows a water flow to be formed therebetween. Arranged in the container 11.

The filtration device 10 of the present embodiment includes a filter 1 having the above-described configuration, a water tank 20 to be treated connected to the filter 1 with various pipes as shown in FIG. 30, a filter aid tank 40, and an air supply tank 50.
Specifically, the filtration device 10 of the present embodiment has the following configuration.

The treated water tank 20 and the filter 1 are connected via the treated water guide path 51.
The treated water introduction path 51 is connected to an introduction path 52 connected to the treated water introduction port 12, and an on-off valve V <b> 1 is attached to the treated water introduction path 51.
An opening / closing valve V <b> 2 is attached to the introduction path 52.

The filter aid tank 40 and the filter 1 are connected via a filter aid introduction path 53.
The filter aid introduction path 53 is connected to the introduction path 52, and the filtration device 10 according to the present embodiment includes an on-off valve V3 attached to the filter aid introduction path 53 and the treated water introduction path 51. By the on-off valve V1 attached to, the flow for introducing the water to be treated and the flow for introducing the filter aid can be switched.

The treated water tank 30 and the filter 1 are connected via a treated water discharge path 54.
The treated water discharge path 54 is connected to the treated water discharge port 14 of the filter 1, and an open / close valve V <b> 4 is attached to the treated water discharge path 54.

A precoat water circulation path 55 connected to the filter aid tank 40 is connected to the treated water discharge path 54.
An on-off valve V5 is attached to the precoat water circulation path 55, and the filtration device 10 of the present embodiment includes an on-off valve V4 attached to the treated water discharge path 54 and an on-off valve attached to the precoat water circulation path 55. V5 is configured to be able to switch between a flow for discharging the treated water to the outside of the filtration device 10 and a flow for transferring the treated water to the filter aid tank 40.

The treated water tank 30 and the filter 1 are also connected via a backwash water introduction path 56 connected to the treated water discharge port 14.
On-off valves V6a and V6b are attached to the reverse cleaning water introduction path 56.
The filtration device 10 according to the present embodiment has a flow of introducing the backwash water by the V6a, V6b attached to the backwash water introduction path 56 and the on-off valve V4 attached to the treated water discharge path 54, and the treatment. The flow for discharging water can be switched.

A backwash water discharge path 57 is connected to the backwash water discharge port 13 of the filter 1.
An open / close valve V7 is attached to the reverse cleaning water discharge path 57, and the reverse cleaning water discharge path 57 discharges the reverse cleaning water from the filter 1 as waste water.
Connected to the reverse cleaning water discharge path 57 is an air introduction path 58 to which air as a gas is supplied from the air supply tank 50 and to which an on-off valve V8 is attached.
The filtration device 10 of the present embodiment is configured to discharge the reverse cleaning water and the air by the on-off valve V7 attached to the reverse washing water discharge path 57 and the on-off valve V8 attached to the air introduction path 58. The flow to be introduced into the filter 1 can be switched.

  Next, a filtration method for performing filtration using the filtration device 10 having the above-described configuration will be described.

《Pre-coating process》
In the filtration method of this embodiment, the precoat process which makes the said filter aid adhere to each coil filter of said 1st, 2nd coil filter part 1a, 1b can be implemented as needed.
In the precoat step, the filter aid is introduced from the filter aid tank 40 into the filter 1 through the filter aid introduction path 53 through the water to be treated inlet 12.
In the precoat step, the on-off valves V3 and V2 attached to the filter aid introduction path 53 and the on-off valve V5 attached to the precoat water circulation path 55 are opened, and the other on-off valves are closed.
The filter aid flows through the filter 1 from below to above and adheres to the surface of each coil filter.

  In addition, the said precoat process can be performed at any time at the time of the start of use of a filtration apparatus and the stand-by between a filtration process and a filtration process etc. as needed.

<< Filtration process >>
Next, the filtration process which filters treated water with each coil filter of the said filter 1 and obtains treated water is implemented.
When performing the filtration step, the on-off valve V1 attached to the treated water introduction path 51, the on-off valve V2 attached to the introduction path 52, and the on-off valve V4 of the treated water discharge path 54 are opened, The on-off valves V3, V5 to V8 in the path are closed.
To-be-treated water is introduced from the to-be-treated water inlet 12 into the filter 1 through the to-be-treated water introduction path 51 and the introduction path 52 by the pump P1 from the to-be-treated water tank 20.
In the filter 1, the introduced water to be treated is passed from the outside to the inside of each coil filter of the first coil filter portion 1a and the second coil filter portion 1b to remove the suspended matter.
The treated water from which the suspended matter has been removed by the first coil filter 1a is transferred from the water collecting part 15a to the second water collecting part 15b via the water collecting pipe 16.
In the second coil filter section 1b, the filtered water is filtered by each coil filter, and the filtered treated water is collected as treated water in the second water collecting section 15b.
That is, the treated water treated by the first and second coil filter parts 1a and 1b is collected in the second water collecting part 15b and from the treated water discharge port 14 opened in the second water collecting part 15b. Transfer to the treated water tank 30 through the treated water discharge path 54.

《Cleaning process》
Next, a cleaning process for cleaning each coil filter of the first and second coil filter portions is performed.
In the cleaning process of the present embodiment, an air cleaning process for separating the suspension adhering to the coil filter by air from the coil filter, and the cleaning water is passed from the treated water side to the treated water side and suspended by the cleaning water. And a water back-washing step to more reliably remove the matter.

<Air cleaning process>
When the air cleaning process is performed, the on-off valves V6b, V2, and V5 are first opened, and the on-off valves attached to other paths are closed.
The treated water is introduced into the container 11 from the treated water inlet 12 of the container 11 from the treated water tank 30 through the introduction path 52 by the pump P1. When treated water is introduced to about 80% of the container, the pump is stopped and the on-off valves V2 and V6b are closed.
Next, air is introduced from the air introduction path 58 to the backwash water discharge path 57. Air is fed into the container 11 from the reverse cleaning water discharge path 57 through the reverse cleaning water discharge port 13 of the container 11.

The air introduced into the container flows upward from below, hits the coil filter surface of the lower first coil filter portion 1a, and the air adhering to the coil filter surface peels off.
The air flows toward the upper side of the first coil filter 1a, and is formed between the upper surface plate 2 of the water collecting member 17 and the lower surface 18b of the gas dispersion member 18 at a position near the water collecting member 17. It passes through the gap and is further guided to the upper second coil filter portion 1b side.

Since air exists in the lower first coil filter portion 1a, the air passes between the inner peripheral surface of the side of the vessel 11 and the lower first coil filter portion 1a in the lower portion of the vessel 11. . Accordingly, air concentrates around the container 11 at the side of the lower first coil filter portion 1a.
However, the air can be guided toward the center of the container 11 above the first coil filter portion 1 a by the gas dispersion 18 and the upper surface plate 2 of the water collecting member 17.
Therefore, above the first coil filter portion 1a, the air is uniformly dispersed without concentrating the air only around the container.
Also in the second coil filter portion 1b, the air diffused by the gas dispersion 18 peels the suspended matter from the coil filter.

  At the time of air cleaning, the water to be treated stored in the filter 1 may be transferred from the treated water transfer path 55 to the filter aid tank 40.

<Water back washing process>
When the water back washing process is performed, the on / off valves V6a and V6b of the back washing water introduction path 56 and the on / off valve V7 of the back washing water discharge path 57 are opened, and the on / off valves of other paths are closed.

The treated water is transferred from the treated water tank 30 to the filter 1 as the backwash water through the backwash water introduction path 56, and the backwash water is introduced into the filter 1 from the treated water discharge port 14. .
Backwash water is introduced into each coil filter from each water collection part 15a, 15b, and flows from the inside of the coil filter toward the outside. That is, it flows in the reverse flow to the water to be treated for filtration. Washing can be finished by pouring off the suspension remaining in the coil filter by the air washing by the flow of the reverse washing water.
The suspension that has peeled off from the coil filter of the second coil filter portion 1b falls downward. Since the inverted conical upper surface plate 2 of the water collecting member 17 is disposed on the upper portion of the first coil filter portion 1a, the upper surface plate 2 can be obtained even when the suspended matter is placed on the upper surface plate 2. Suspension is easily dropped downward by the surface inclined downward.
Accordingly, the suspension can flow downward without adhering to the first coil filter portion 1a, and can be efficiently discharged from the backwash water discharge path 57.

In addition, in the said embodiment, although the reverse cone-shaped upper surface board 2 of the water collection member 17 attached to the upper part of the 1st coil filter part 1a was used as an inclination board, the upper surface board of a water collection member is made into an inclination board. Not limited to that.
For example, as shown to Fig.3 (a), it consists of a member different from a water collection member between the 1st coil filter part 1a and the 2nd coil filter part 1b, and the inner peripheral surface of the side of the container 11 The filter may be provided with an umbrella-shaped inclined plate 2 ′ that is inclined downward toward 11a.

Moreover, the filter of the embodiment is a gas that is an inner peripheral surface of the side of the container and protrudes toward the center of the container at a position facing the upper surface plate of the water collecting member. Although the dispersion is provided, the position where the gas dispersion is provided is not limited to the position facing the inclined plate as described above.
For example, a gas dispersion may be provided on the inner peripheral surface of the container above the inclined plate.

In the filter of the embodiment, the lower surface is a surface inclined upward from the inner peripheral surface of the container toward the central portion, and the upper surface is inclined upward from the central portion of the container toward the inner peripheral surface. Although the gas dispersion which is a surface is provided, the shape of a gas dispersion is not restricted to this shape.
For example, as shown in FIG. 3 (b), a gas dispersion 18 '' in which an annular plate-like body in a top view is projected from the container peripheral surface 11a so as to incline upward toward the container center, and the container A gas dispersion comprising two members, in which a gas dispersion 18 '' ′ projected from the container peripheral surface 11a so as to incline upward from the center portion toward the inner peripheral surface of the container is arranged in the vertical direction. Alternatively, it may be a gas dispersion made of any one of these members.

Further, the gas dispersion is not limited to being an annular body that is continuous over the entire circumference of the inner peripheral surface of the container, and protrudes at a part of the entire circumference of the inner peripheral surface of the container. It may be a gas dispersion.
Furthermore, the filter of the present invention is not limited to being provided with a gas dispersion.

Furthermore, in the filter of the said embodiment, although the coil filter part provided with the some coil filter was arrange | positioned, it is not a condition to make the said coil filter into the coil filter part put together.
Moreover, although the coil filter part provided with the plurality of coil filters has been arranged in two stages, the upper part and the lower part in the container, the coil filter can also be arranged in two stages in the upper and lower parts in the container. For example, the coil filter may be arranged in three or more stages of the upper part, the middle part, and the lower part.
As described above, when the coil filters are arranged in three or more stages in the vertical direction in the container, the position where the inclined plate is arranged is at least a position between any one of the coil filters arranged vertically. If it is.

  The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is defined by the terms of the claims, rather than the description above, and is intended to include any modifications within the scope and meaning equivalent to the terms of the claims.

  1: filter, 2: inclined plate, 17: water collecting member, 18: gas dispersion, 10: filtration device.

Claims (4)

A plurality of coil filters arranged in the vertical direction;
A container for storing the plurality of coil filters in the same storage portion;
Between the coil filters arranged in the vertical direction, the coil filters are disposed so as to have a gap with the inner peripheral surface on the side of the container, and are inclined downward toward the inner peripheral surface on the side of the container. An inclined plate having a surface;
A filtration apparatus comprising:   A water collecting member for collecting the treated water filtered by the lower coil filter is arranged on the upper part of the lower coil filter of the coil filters arranged in the vertical direction. The filtration device according to claim 1, wherein an upper portion is formed as the inclined plate.   The gas dispersion body according to claim 1, further comprising a gas dispersion member that protrudes from the inner peripheral surface on the side of the container toward the central portion of the container at a position facing or above the inclined plate. The filtration apparatus as described. A coil filter section in which the plurality of coil filters are arranged in a lateral direction;
The coil filter portion is arranged in a plurality of stages in the vertical direction,
The filtration device according to any one of claims 1 to 3, wherein the inclined plate is provided between the coil filter portions arranged in the vertical direction.

Images