Filtering device, filter material extraction device, filter material extraction method, filter material replenishment device, filter material replenishment method and filter material replacement method

Abstract

To provide a filtering device, a filter material extraction device and a filter material extraction method, each enabling easy extraction of particulate filter material from a filter tower, while reducing loss.SOLUTION: A filtering device is provided, comprising a filter tower having a filter layer which is filled with particulate filter material and water supply piping for supplying water for extracting the filter materials into the filter tower, in a direction from a bottom portion of the filter layer toward an upper portion. In the filter tower, an extraction port portion is provided which can be connected to the extraction piping, through which the filter materials in the filter tower are extracted together with water, and an extraction valve is provided in the extraction port portion. A filter material extraction device comprises the extraction piping, which is connected to the filter port portion and which extracts the filter materials together with water from the filter tower. A filter material extraction method is provided which uses the filter material extraction device.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a filtration device, a filter medium extraction device, a filter medium extraction method, a filter medium replenishment device, a filter medium replenishment method, and a filter medium replacement method.

Background Art

[0002] Particulate filter media are widely used in various industrial fields such as the food, pharmaceutical, chemical, and water treatment industries, as well as public environmental projects. Especially at water treatment sites, particulate filter media such as activated carbon, ion exchange resins, and sand filter media are mainly used for the adsorption of specific impurities.

[0003] In order to prevent abnormal water treatment performance, the filter medium needs to be replaced regularly. As a method for removing the filter medium from the filtration tower, for example, a method of sucking out the filter medium from the filtration tower by suction with a vacuum truck is known. Also known is a method of opening a manhole provided on the side wall of the filtration tower, manually removing the filter medium using a shovel, and introducing a new filter medium.

[0004] Patent Document 1 proposes a method for more easily replacing particulate filter media. After used activated carbon particles are withdrawn from an activated carbon adsorption tower (filtration tower) by an activated carbon extraction device provided at the lower part of the activated carbon adsorption tower, new activated carbon is replenished into the activated carbon adsorption tower by a new activated carbon supply device provided beside the activated carbon adsorption tower.

Prior Art Documents

Patent Documents

[0005]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0006] However, in the method of Patent Document 1, when extracting or replenishing the filter medium from the filtration tower, the filter medium easily adheres to the inner wall surface of the filtration tower or the piping, resulting in losses during the extraction and replenishment of the filter medium. In particular, activated carbon has small particles and easily adheres to the wall surface of the filtration tower or the piping, leading to significant losses. Further, since the activated carbon adsorption device 6 of Patent Document 1 is a self-weight type, it is necessary to secure sufficient space below the activated carbon filtration tower, making the entire filtration device large and complex.

[0007] One object of the present invention is to provide a filtration device, a filter medium extraction device, and a filter medium extraction method that can easily extract particulate filter media from a filtration tower while reducing losses. Another object of the present invention is to provide a filter medium replenishment device and a filter medium replenishment method that can easily replenish particulate filter media into a filtration tower while reducing losses. Another object of the present invention is to provide a filter medium replacement method that can easily replace particulate filter media in a filtration tower while reducing losses.

Means for Solving the Problems

[0008] As a result of intensive studies, the present inventors have found that by utilizing the force of water in extracting the filter medium from the filtration tower and replenishing the filter medium into the filtration tower, the filter medium can be easily extracted and replenished while reducing losses, leading to the present invention.

[0009] That is, the present invention includes the following configurations. [1] A filtration tower having a filtration layer filled with particulate filter media, A water supply pipe for supplying water for extracting the filter medium into the filtration tower in a direction from the bottom to the top of the filtration layer, The filtration tower is provided with an extraction port portion to which an extraction pipe can be connected for extracting the filter medium in the filtration tower together with water, A filtration device provided with an extraction valve at the extraction port portion. [2] The filtration device according to [1], wherein the extraction port portion is provided at the bottom of the filtration layer in the filtration tower. [3] A filtration tower having a filtration layer filled with particulate filter media, and a water supply pipe for supplying water for extracting the filter media from the bottom to the top of the filtration layer into the filtration tower, wherein an outlet for extracting the filter media together with water in the filtration tower is provided in the filtration tower, and an extraction valve is provided at the outlet. A filter media extraction device for extracting filter media from the filtration tower in the filtration device, A filter media extraction device comprising an extraction pipe connected to the outlet for extracting the filter media together with water from the inside of the filtration tower. [4] Further comprising a filter media recovery tank for recovering the filter media extracted from the filtration tower, The filter media extraction device according to [3], wherein the other end of the extraction pipe opposite to the one end connected to the outlet is connected to the filter media recovery tank. [5] A method for extracting particulate filter media from the filtration tower using the filter media extraction device according to [3] or [4], Connecting the extraction pipe to the outlet, supplying water into the filtration tower from the water supply pipe, and extracting the filter media together with water from the inside of the filtration tower through the extraction pipe. A filter media extraction method. [6] The filter media extraction method according to [5], wherein one end of the extraction pipe is connected to the outlet provided at the bottom of the filtration layer in the filtration tower to extract the filter media. [7] A filter media replenishment device for replenishing filter media to the filtration tower in a filtration device comprising a filtration tower having a filtration layer filled with particulate filter media and a treated water passing pipe for passing treated water through the filtration tower, A filter media storage tank for storing the filter media, A filter media replenishment pipe for replenishing the filter media together with water to the filtration tower, A power source, and The filter media replenishment device, wherein the filter media-containing water containing the filter media is supplied from the filter media storage tank to the filtration tower through the filter media replenishment pipe by the power source, thereby replenishing the filter media to the filtration tower. [8] The filter medium replenishment device according to [7], wherein one end of the filter medium replenishment pipe is connected to the middle of the water pipe for the water to be treated, and the other end of the filter medium replenishment pipe is connected to the filter medium storage tank. [9] The filter medium replenishment device according to [7] or [8], wherein the power source is a pump.

[10] The filter medium replenishment device according to [7], wherein an ejector is provided in the water pipe for the water to be treated as the power source, and by driving the ejector, the filter medium-containing water is supplied from the filter medium replenishment pipe to the filtration tower through the water pipe for the water to be treated.

[11] A method for replenishing particulate filter medium to the filtration tower using the filter medium replenishment device according to any one of [7] to

[10] , A filter medium replenishment method for replenishing the filter medium to the filtration tower by supplying the filter medium-containing water from the filter medium storage tank to the filtration tower.

[12] The filter medium replenishment method according to

[11] , wherein the mass ratio of water to filter medium in the filter medium-containing water is 1:1 to 10:1.

[13] A method for replenishing particulate filter medium to the filtration tower using the filter medium replenishment device according to [8] or

[10] , A filter medium replenishment method for replenishing the filter medium to the filtration tower by supplying the filter medium-containing water from the filter medium storage tank to the filtration tower through the water pipe for the water to be treated together with the water to be treated.

[14] A filter medium replacement method including at least one of extracting particulate filter medium from the filtration tower by the filter medium extraction method according to [5] or [6], and replenishing new particulate filter medium to the filtration tower by the filter medium replenishment method according to any one of

[11] to

[13] .

Advantages of the Invention

[0010] According to one embodiment of the present invention, there are provided a filtration device, a filter medium extraction device, and a filter medium extraction method capable of simply extracting particulate filter medium from a filtration tower while reducing loss. According to one embodiment of the present invention, there are provided a filter medium replenishment device and a filter medium replenishment method capable of simply replenishing particulate filter medium to a filtration tower while reducing loss. According to an embodiment of the present invention, there is provided a filter medium replacement method capable of easily replacing the particulate filter medium of a filtration tower while reducing loss.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Mode for Carrying Out the Invention

[0012] Hereinafter, an embodiment of the present invention will be described with reference to the drawings. In the following description, the dimensions and the like of the illustrated figures are examples, and the present invention is not necessarily limited thereto, and it can be appropriately modified and implemented without changing the gist thereof.

[0013] [Filtration Device] The filtration device according to the embodiment includes a filtration tower having a filtration layer filled with particulate filter medium, and a water supply pipe for supplying water for extracting the filter medium upward from the bottom to the top of the filtration layer into the filtration tower. The filtration tower is provided with an extraction port portion to which an extraction pipe can be connected for extracting the filter medium in the filtration tower together with water, and an extraction valve is provided at the extraction port portion. Hereinafter, an example of the filtration device according to the embodiment will be shown and described in more detail.

[0014] FIG. 1 is a schematic diagram showing a filtration device 1 according to an example of the embodiment. The filtration device 1 includes a filtration tower 10, a water to be treated water supply pipe L1, a backwash water discharge pipe L2, a backwash water supply pipe L3, a trial operation water discharge pipe L4, a treated water discharge pipe L5, and a lower part pipe L6 of the filtration tower.

[0015] The filtration tower 10 has a filtration layer 11 filled with particulate filter media inside. A filter 12 is provided at the bottom of the filtration layer 11 inside the filtration tower 10 so that the filter media does not leak below the filter 12. The filtration tower 10 has an upper space above the filtration layer 11 inside, and this upper space is also called a development layer. The upper space is a space for the filter media to rise when backwashing the filter media.

[0016] In the present invention, the "particulate filter media" means a filter media having an average particle size of 0.01 to 10 mm, preferably 0.1 to 5 mm, more preferably 0.2 to 4 mm. Within this range, it is particularly suitable. The average particle size in the present invention is the "arithmetic mean value of the particle diameter" defined in JIS Z 8901:2006 "Powders for testing and Particles for testing". When the filter media is activated carbon, it is measured using the "JIS K1474 Activated carbon test method". Examples of the particulate filter media include activated carbon, ion exchange resin, sand, and the like.

[0017] The filtration device 1 may be an activated carbon filtration device including an activated carbon tower as the filtration tower 10, a soft water device including an ion exchange resin tower as the filtration tower 10, or a sand filtration device including a sand filtration tower as the filtration tower 10. Further, the filtration device 1 may include a plurality of filtration towers 10. In this case, the plurality of filtration towers 10 may be the same type of filtration tower or different types of filtration towers.

[0018] One end of the treated water pipe L1 is connected to the upper space of the filtration tower 10. The connection destination of the other end of the treated water pipe L1, which is opposite to the end connected to the filtration tower 10, is not particularly limited as long as it is a pretreatment device in front of the filtration tower 10. For example, it can be connected to other treatment devices such as other filtration towers or prefilters, a water source, a raw water tank, etc.

[0019] One end of the backwash water discharge pipe L2 is connected to the upper space of the filtration tower 10 through the treated water pipe L1. That is, the backwash water discharge pipe L2 is provided so as to branch from the treated water pipe L1. The connection destination of the other end of the backwash water discharge pipe L2, which is opposite to the end connected to the treated water pipe L1, is not particularly limited and can be connected to, for example, a wastewater treatment device or a drainage tank.

[0020] A filtration tower lower pipe L6 is connected to the bottom of the filtration tower 10. One end of the treated water discharge pipe L5 is connected to an intermediate portion of the filtration tower lower pipe L6. That is, the treated water discharge pipe L5 is provided so as to branch from the filtration tower lower pipe L6. The connection destination of the other end of the treated water discharge pipe L5, which is opposite to the end connected to the filtration tower lower pipe L6, is not particularly limited as long as it is a post-treatment device of the filtration tower 10. For example, it can be connected to other treatment devices such as other filtration towers or membrane treatment devices, a treated water tank, etc.

[0021] A backwash water supply pipe L3 and a commissioning water discharge pipe L4 are connected to the other end of the filtration tower lower pipe L6, which is opposite to the end connected to the filtration tower 10. The other end of the backwash water supply pipe L3, which is opposite to the end connected to the filtration tower lower pipe L6, can be connected to, for example, a backwash water storage tank or a treated water tank. The connection destination of the other end of the commissioning water discharge pipe L4, which is opposite to the end connected to the filtration tower lower pipe L6, is not particularly limited and can be connected to, for example, a wastewater treatment device or a drainage tank.

[0022] The raw water supply pipe L1 is a pipe for supplying raw water to the filtration tower 10, and a raw water supply valve B1 is provided upstream of the branch point of the backwash water discharge pipe L2. The backwash water discharge pipe L2 is a pipe for discharging backwash water from the filtration tower 10 when backwashing the filtration layer 11 of the filtration tower 10, and a backwash water discharge valve B2 is provided near the branch point from the raw water supply pipe L1. The backwash water supply pipe L3 is a pipe for supplying backwash water to the filtration tower 10 when backwashing the filtration layer 11 of the filtration tower 10, and a backwash water supply valve B3 is provided near the connection point with the lower filtration tower pipe L6. The commissioning water discharge pipe L4 is a pipe for discharging commissioning water from the filtration tower 10 during commissioning after backwashing, and a commissioning water discharge valve B4 is provided near the connection point with the lower filtration tower pipe L6. The treated water discharge pipe L5 is a pipe for discharging the filtered treated water from the filtration tower 10 during the filtration treatment of the raw water in the filtration tower 10, and a treated water discharge valve B5 is provided near the branch point from the lower filtration tower pipe L6.

[0023] The filtration tower 10 is provided with an extraction port 13 for extracting the filter medium in the filtration tower 10 together with water. The extraction port 13 can be connected to an extraction pipe for extracting the filter medium together with water, which will be described later, and an extraction valve B6 is provided. The extraction port 13 is preferably provided at the bottom of the filtration layer 11 in the filtration tower 10, that is, at a position substantially coinciding with the upper surface of the filter 12, as shown in an example in FIG. 1. Thereby, when extracting the filter medium together with water from the filtration tower 10, it becomes easy to prevent the filter medium from remaining in the filtration tower 10. Note that, as long as the effects of the present invention are not impaired, it may be provided above the bottom of the filtration layer 11 in the filtration tower 10.

[0024] The raw water supply pipe L1, the backwash water discharge pipe L2, the backwash water supply pipe L3, the commissioning water discharge pipe L4, the treated water discharge pipe L5, and the lower filtration tower pipe L6 are not particularly limited, and known pipes can be used. As the water to be treated flow control valve B1, backwash water discharge valve B2, backwash water supply valve B3, commissioning water discharge valve B4, treated water discharge valve B5, and extraction valve B6, any valve that can control the flow of water by opening and closing can be used, and known valves can be employed.

[0025] During the filtration treatment of the water to be treated, the water to be treated flow control valve B1 and the treated water discharge valve B5 are opened, while the backwash water discharge valve B2, backwash water supply valve B3, commissioning water discharge valve B4, and extraction valve B6 are closed. In this state, as shown in Figure 2, the water to be treated W1 is supplied to the filtration tower 10 through the water to be treated flow pipe L1, and the water to be treated W1 is filtered in the filter layer 11. The treated water W2 after filtration in the filter layer 11 is sent downstream through the lower pipe L6 of the filtration tower and the treated water discharge pipe L5.

[0026] When the filtration treatment of the water to be treated is continuously operated, impurities gradually accumulate in the filter layer 11, resulting in a decline in water treatment performance. Therefore, after performing the filtration treatment for a certain period, the filter layer 11 is washed. In the filtration device 1 of this example, the filter layer 11 is washed by a backwash treatment in which backwash water is passed in the direction opposite to that during the filtration treatment of the water to be treated, that is, from the bottom to the top of the filter layer 11.

[0027] During the backwash of the filter layer 11, the backwash water discharge valve B2 and the backwash water supply valve B3 are opened, while the water to be treated flow control valve B1, commissioning water discharge valve B4, treated water discharge valve B5, and extraction valve B6 are closed. In this state, as shown in Figure 3, the backwash water W3 is supplied to the filtration tower 10 through the backwash water supply pipe L3, and the backwash water W3 is passed from the bottom to the top of the filter layer 11. The backwash water W3 that has passed through the filter layer 11 is drained through the backwash water discharge pipe L2.

[0028] When restarting the filtration process of the water to be treated after backwashing, a preliminary test run is carried out first. During the test run, the water to be treated passing valve B1 and the test run water discharge valve B4 are opened, while the backwash water discharge valve B2, the backwash water supply valve B3, the treated water discharge valve B5, and the extraction valve B6 are closed. In this state, as shown in FIG. 4, the test run water W4 is supplied to the filtration tower 10 through the water to be treated passing pipe L1, and the test run water W4 that has passed through the filtration layer 11 is drained through the lower pipe L6 of the filtration tower and the test run water discharge pipe L4. As the test run water W4, the same water as the water to be treated W1 can be used.

[0029] As described above, in the filtration device 1, the backwash water supplied to the filtration tower 10 through the backwash water supply pipe L3 is supplied in a direction from the bottom to the top of the filtration layer 11. Therefore, in the filtration device 1, the backwash water supply pipe L3 can also be used as a water supply pipe for supplying water for extracting the filter medium. That is, the backwash water supply pipe L3 in the filtration device 1 also serves as a water supply pipe for supplying water for extracting the filter medium from the filtration tower 10 into the filtration tower 11 in a direction from the bottom to the top of the filtration layer 11. Note that the filtration device according to the embodiment is not limited to the form in which the backwash water supply pipe L3 also serves as a water supply pipe for supplying water for extracting the filter medium, and a water supply pipe for supplying water for extracting the filter medium may be installed separately from the backwash water supply pipe.

[0030] When extracting the filter medium from the filtration tower 10, the backwash water supply valve B3 and the extraction valve B6 are opened, while the water to be treated passing valve B1, the backwash water discharge valve B2, the test run water discharge valve B4, and the treated water discharge valve B5 are closed. In this state, as shown in FIG. 5, by supplying the water W5 for extracting the filter medium to the filtration tower 10 through the backwash water supply pipe L3, the filter medium M in the filtration tower 10 is extracted from the extraction port 13 together with the water W5. By supplying water to the filtration tower 10 and extracting the filter medium together with the water, it is possible to suppress the filter medium from adhering to and remaining on the inner wall surfaces of the filtration tower 10 and the pipes.

[0031] Above the filtration layer 11 inside the filtration tower 10, an upper space not filled with filter media is provided. Therefore, when extracting the filter media, water W5 for extracting the filter media is supplied from the bottom to the top of the filtration layer 11, causing the filter media to rise by the water flow in the filtration tower 10 and the filter media to be easily dispersed in the water. As a result, the filter media can be easily extracted together with the water. Also, when water is supplied from the top to the bottom of the filtration layer 11, the filter media is pressed towards the filter 12 by the water flow, so when extracting the filter media together with the water, it is necessary to apply a stronger water pressure.

[0032] [Filter Media Extraction Device] The filter media extraction device according to the embodiment is a device for extracting filter media from the filtration device according to the foregoing embodiment, and includes an extraction pipe for extracting the filter media together with water from inside the filtration tower, which is connected to an extraction port provided in the filtration tower. Hereinafter, an example of the filter media extraction device will be shown and described in more detail.

[0033] As shown in FIG. 5, the filter media extraction device 2 according to an example of the embodiment includes an extraction pipe 21 and a filter media recovery tank 22 for recovering the filter media extracted from the filtration tower 10. Note that the filter media extraction device 2 may not include the filter media recovery tank 22.

[0034] The extraction pipe 21 is a pipe for extracting the filter media together with water from inside the filtration tower 10, and one end is configured to be connectable to an extraction port 13 provided in the filtration tower 10. In the example shown in FIG. 5, the other end of the extraction pipe 21 opposite to the end connected to the extraction port 13 is connected to the filter media recovery tank 22. Thereby, the filter media extracted together with water from the extraction port 13 is recovered into the filter media recovery tank 22 through the extraction pipe 21.

[0035] As the extraction pipe 21, any pipe that can extract the filter medium together with water may be used. For example, a hose can be used. If a hose is used as the extraction pipe 21, it is easy to carry, the connection to and removal from the extraction port 13 are easy, and it is advantageous in that it can be easily recovered when the filter medium is not extracted. Note that the extraction pipe 21 is not limited to a hose and may be a pipe made of stainless steel or the like. The inner diameter of the extraction pipe 21 may be selected according to the particle size of the filter medium.

[0036] As the filter medium recovery tank 22, any tank that can accommodate the filter medium may be used. For example, a flexible container can be used. Note that the filter medium recovery tank 22 may be a tank provided in a vacuum truck.

[0037] The filter medium extraction device 2 does not necessarily have a power source for extracting the filter medium from the filtration tower 10 together with water. This is because water is supplied to the filtration tower 10 from the backwash water supply pipe L3 that also serves as the water supply pipe, and the filter medium flows out to the extraction pipe 21 together with the water along with the water flow.

[0038] Note that when the filtration device 1 does not include the backwash water supply pipe L3 that can also serve as the water supply pipe, the filter medium extraction device 2 may include a water supply pipe for supplying water for extracting the filter medium to the filtration tower. In this case, the other end of the water supply pipe of the filter medium extraction device 2, which is opposite to the end connected to the filtration tower, is connected to a water storage tank or the like. Further, a pump that serves as a power source for sending water toward the filtration tower may be provided in the water supply pipe of the filter medium extraction device 2.

[0039] [Filter Medium Extraction Method] The filter medium extraction method according to the embodiment is a method of extracting the filter medium from the above-described filtration device using the above-described filter medium extraction device, including connecting the extraction pipe to the extraction port of the filtration tower, supplying water into the filtration tower from the water supply pipe, and extracting the filter medium from the filtration tower through the extraction pipe together with water.

[0040] In an example of the filter medium extraction method shown in FIG. 5, one end of an extraction pipe 21 of the filter medium extraction device 2 is connected to an extraction port portion 13 provided in the filtration tower 10, and the other end of the extraction pipe 21 is connected to a filter medium recovery tank 22. Then, with the backwash water supply valve B3 and the extraction valve B6 opened and the raw water passage valve B1, the backwash water discharge valve B2, the trial operation water discharge valve B4, and the treated water discharge valve B5 closed, water W5 for extracting the filter medium is supplied to the filtration tower 10 through the backwash water supply pipe L3. As a result, the filter medium M in the filtration tower 10 flows out from the extraction port portion 13 together with the water W5 and is recovered into the filter medium recovery tank 22 through the extraction pipe 21. In an example shown in FIG. 5, since the extraction pipe 21 is connected to the extraction port portion 13 provided at the bottom of the filtration layer 11 in the filtration tower 10 to extract the filter medium, it is even easier to prevent the filter medium from remaining in the filtration tower 10.

[0041] Thus, in the filter medium extraction method according to the embodiment, water is supplied to the filtration tower, and the filter medium is extracted from the filtration tower together with the water. Therefore, it is possible to easily extract the filter medium from the filtration tower while suppressing the loss of the filter medium due to adhesion to the inner wall surfaces of the filtration tower and the pipes.

[0042] [Filter Medium Replenishment Device] The filter medium replenishment device according to the embodiment is a device for replenishing a filter medium to a filtration tower in a filtration device including a filtration tower having a filtration layer filled with particulate filter medium and a raw water passage pipe for passing raw water through the filtration tower, and includes a filter medium storage tank for storing the filter medium, a filter medium replenishment pipe for replenishing the filter medium to the filtration tower together with water, and a power source. The filter medium-containing water containing the filter medium is supplied from the filter medium storage tank to the filtration tower through the filter medium replenishment pipe by the power source, thereby replenishing the filter medium to the filtration tower. Hereinafter, an example of the filter medium replenishment device according to the embodiment will be shown and described in more detail.

[0043] FIG. 6 is a schematic diagram showing a filter medium replenishment device 3 according to an example of the embodiment. The filter medium replenishment device 3 is a device for replenishing a filter medium to the filtration tower 10 of the filtration device 1. The filter medium replenishing device 3 includes a filter medium storage tank 31 for storing the filter medium, a filter medium replenishing pipe 32, a power source 33, and a water supply pipe 34.

[0044] The filter medium replenishing pipe 32 is a pipe for replenishing the filter medium together with water into the filtration tower 10. One end thereof is connected to the middle of the water passage pipe L1 for the water to be treated, and the other end is connected to the filter medium storage tank 31. The water supply pipe 34 is a pipe for supplying water to the filter medium storage tank 31. One end thereof is connected to the filter medium storage tank 31. The other end, which is opposite to the one end connected to the filter medium storage tank 31 in the water supply pipe 34, can be connected to, for example, a water storage tank or the like. The filter medium replenishing pipe 32 and the water supply pipe 34 are not particularly limited, and for example, a hose can be used. Using a hose is advantageous in that it is easy to carry, the connection and disconnection operations are easy, and it can be easily recovered when the filter medium is not taken out.

[0045] The power source 33 may be any device that can supply the filter medium-containing water W6 containing the filter medium from the filter medium storage tank 31 to the filtration tower 10, and for example, a pump can be mentioned. As the pump, a rubber pump is preferable because it is easy to suppress damage to the filter medium.

[0046] In the filter medium replenishing device 3, with the filter medium stored in the filter medium storage tank 31, water is replenished from the water supply pipe 34 into the filter medium storage tank 31 to form the filter medium-containing water W6 containing the filter medium. Then, by driving the power source 33, the filter medium-containing water W6 is supplied from the filter medium storage tank 31 to the filtration tower 10 through the filter medium replenishing pipe 32 and the water passage pipe L1 for the water to be treated. Thereby, the filter medium is replenished to the filter layer 11 of the filtration tower 10.

[0047] Note that the form in which one end of the filter medium replenishment pipe 32 is connected to the middle of the water passage pipe L1 for the water to be treated is not limited. For example, in the filter medium replenishment device 3, one end of the filter medium replenishment pipe 32 may be directly connected to the upper part of the filtration tower 10. The inner diameter of the filter medium replenishment pipe 32 may be selected according to the particle size of the filter medium, and the extraction pipe 21 may be directly diverted for use. Further, the filter medium replenishment device 3 may not include the water supply pipe 34. In this case, filter medium-containing water in which water and the filter medium are mixed in advance may be stored in the filter medium storage tank 31, and the filter medium may be replenished.

[0048] The filter medium replenishment device according to the embodiment is not limited to the aforementioned filter medium replenishment device 3. For example, the filter medium replenishment device 4 illustrated in FIG. 7 may be used. The filter medium replenishment device 4 is a device for replenishing the filter medium to the filtration tower 10 of the filtration device 1. The filter medium replenishment device 4 includes a filter medium storage tank 41 for storing the filter medium, a filter medium replenishment pipe 42, and a power source 43.

[0049] The descriptions of the filter medium storage tank 31 and the filter medium replenishment pipe 32 in the filter medium replenishment device 3 also apply to the filter medium storage tank 41 and the filter medium replenishment pipe 42. The power source 43 in the filter medium replenishment device 4 of the example shown in FIG. 7 is an ejector, which is provided in the water passage pipe L1 for the water to be treated. The ejector is advantageous in that it can be inexpensively modified using polyvinyl chloride. Further, by providing a pipe bypass for supplying water to the filter medium storage tank 31 to the ejector, it is also possible to make the plant a permanent installation. Further, since the ejector transfers the filter medium by water pressure, no power supply or external force is required, and it is easy to suppress damage to the filter medium.

[0050] The ejector of the power source 43 uses the water to be treated W1 as the driving fluid. When the water to be treated W1, which is the driving fluid, is sent to the filtration tower 10 by the ejector, the inside of the ejector is depressurized, and the filter medium-containing water W6 is sucked into the ejector from the filter medium storage tank 41 through the filter medium replenishment pipe 42, and the filter medium-containing water W6 is mixed with the water to be treated W1. Then, the filter medium-containing water W6 is supplied to the filtration tower 10 together with the water to be treated W1, so that the filter medium layer 11 is replenished with the filter medium.

[0051] [Filter Medium Replenishment Method] The filter medium replenishment method according to the embodiment is a method of replenishing the particulate filter medium to the filtration tower using the filter medium replenishment device according to the embodiment, and is a method of replenishing the filter medium to the filtration tower by supplying the filter medium-containing water from the filter medium storage tank to the filtration tower.

[0052] In an example of the filter medium replenishment method shown in FIG. 6, the power source 33 of the filter medium replenishment device 3 is driven, and the filter medium-containing water W6 is supplied from the filter medium storage tank 31 to the filtration tower 10 through the filter medium replenishment pipe 32 and the water to be treated water pipe L1, thereby replenishing the filter medium in the filtration layer 11 of the filtration tower 10. In this example, the filter medium-containing water W6 may be supplied to the filtration tower 10 together with the water to be treated W1, or only the filter medium-containing water W6 may be supplied to the filtration tower 10 without supplying the water to be treated W1 to the filtration tower 10. Since the filter medium can be easily supplied to the filtration tower 10 even if the power of the power source 33 is small, it is preferable to supply the filter medium-containing water W6 to the filtration tower 10 together with the water to be treated W1.

[0053] In an example of the filter medium replenishment method shown in FIG. 7, the ejector, which is the power source 43 of the filter medium replenishment device 4, is driven using the water to be treated W1 as the driving fluid. Thereby, the filter medium-containing water W6 is sucked into the ejector from the filter medium storage tank 41 through the filter medium replenishment pipe 42 and mixed with the water to be treated W1. Then, the filter medium-containing water W6 is supplied to the filtration tower 10 together with the water to be treated W1 through the water to be treated water pipe L1, thereby replenishing the filter medium in the filtration layer 11 of the filtration tower 10.

[0054] Thus, in the filter medium replenishment method according to the embodiment, by replenishing the filter medium together with water into the filtration tower 10, it is possible to suppress the loss of the filter medium due to adhesion to the inner wall surface of the filtration tower 10 and the piping. Further, since the filter medium can be supplied to the filtration tower 10 by the water flow, the filter medium can be easily replenished to the filter layer 11.

[0055] The mass ratio of water to the filter medium in the filter medium-containing water W6 is preferably from 1:1 to 10:1, more preferably from 2:1 to 8:1. If the mass ratio of water to the filter medium is within the above range, it becomes even easier to simply replenish the filter medium to the filtration tower while reducing losses.

[0056] [Filter Medium Replacement Method] The filter medium replacement method according to the embodiment is a method including at least one of extracting particulate filter medium from the filtration tower by the filter medium extraction method according to the above-described embodiment and replenishing new particulate filter medium to the filtration tower by the filter medium replenishment method according to the embodiment. Since the effect of being able to easily replace the filter medium in the filtration tower while reducing losses is higher, it is preferable to include both extracting particulate filter medium from the filtration tower by the filter medium extraction method according to the embodiment and replenishing new particulate filter medium to the filtration tower by the filter medium replenishment method according to the embodiment.

[0057] As described above, in the present invention, by extracting the filter medium from the filtration tower together with water or supplying and replenishing the filter medium to the filtration tower together with water, it is possible to suppress the loss of the filter medium due to adhesion to the inner wall surface of the filtration tower and the piping. Activated carbon has a smaller particle size compared to other filter media and tends to particularly adhere to the inner wall surface of the filtration tower and the piping, but the present invention is very useful in that it can exhibit sufficient efficacy even in the case of activated carbon. Further, since the extraction and replenishment of the filter medium can be performed by the water flow, the extraction and replenishment of the filter medium are easy, and the efficiency of on-site work is greatly improved.

[0058] In Patent Document 1, an activated carbon extraction device is provided at the lower part of the activated carbon adsorption tower, and activated carbon particles are extracted from the activated carbon adsorption tower using gravity. Therefore, when applying it to an existing filtration device, it is necessary to lift the activated carbon adsorption tower upward, so it is difficult to apply it to an existing filtration device. On the other hand, a reverse washing water supply pipe for supplying reverse washing water is generally connected to the filtration tower provided in the filtration device, and it can be used as a water supply pipe for extracting filter media. In this case, since the present invention can be applied to an existing filtration device only by newly installing an extraction port portion in the filtration tower, it is easy to apply it to an existing filtration device.

Explanation of Signs

[0059] 1 Filtration device 2 Filter media extraction device 3 Filter media replenishment device 4 Filter media replenishment device 10 Filtration tower 11 Filtration layer 12 Filter 13 Extraction port portion 21 Extraction pipe 22 Filter media recovery tank 31 Filter media storage tank 32 Filter media replenishment pipe 33 Power source 33 34 Water supply pipe 41 Filter media storage tank 42 Filter media replenishment pipe 43 Power source L1 Treated water passing pipe L2 Reverse washing water discharge pipe L3 Reverse washing water supply pipe L4 Commissioning water discharge pipe L5 Treated water discharge pipe L6 Lower part pipe of filtration tower B1 Treated water passing valve B2 Reverse washing water discharge valve B3 Reverse washing water supply valve B4 Commissioning water discharge valve B5 Treated water discharge valve B6 Extraction valve

Claims

1. A filtration tower having a filtration layer filled with particulate filter media, and a water supply pipe for supplying water for extracting the filter media into the filtration tower in a direction from the bottom to the top of the filtration layer, comprising: The filtration tower is provided with an outlet portion to which an extraction pipe can be connected for extracting the filter media in the filtration tower together with water, A filtration device, wherein an extraction valve is provided at the outlet portion.

2. The filtration device according to claim 1, wherein the outlet portion is provided at the bottom of the filtration layer in the filtration tower.

3. A filtration tower having a filtration layer filled with particulate filter media, and a water supply pipe for supplying water for extracting the filter media into the filtration tower in a direction from the bottom to the top of the filtration layer, and an outlet portion for extracting the filter media in the filtration tower together with water is provided in the filtration tower, and an extraction valve is provided at the outlet portion. A filter media extraction device for extracting filter media from the filtration tower in the filtration device, A filter media extraction device comprising an extraction pipe connected to the outlet portion for extracting the filter media from the filtration tower together with water.

4. Further comprising a filter media recovery tank for recovering the filter media extracted from the filtration tower, The filter media extraction device according to claim 3, wherein the other end of the extraction pipe opposite to one end connected to the outlet portion is connected to the filter media recovery tank.

5. A method for extracting particulate filter media from the filtration tower using the filter media extraction device according to claim 3, Connecting the extraction pipe to the outlet portion, supplying water into the filtration tower from the water supply pipe, and extracting the filter media together with water from the filtration tower through the extraction pipe. A filter media extraction method.

6. The filter media extraction method according to claim 5, wherein one end of the extraction pipe is connected to the outlet portion provided at the bottom of the filtration layer in the filtration tower to extract the filter media.

7. A filter media replenishment device for replenishing filter media to a filtration tower in a filtration device comprising a filtration tower having a filtration layer filled with particulate filter media and a treated water passage pipe for passing treated water through the filtration tower, A filter media storage tank for storing the filter media, A filter media replenishment pipe for replenishing the filter media to the filtration tower together with water, A power source, comprising: A filter medium replenishing device in which filter medium-containing water containing the filter medium is supplied from the filter medium storage tank to the filtration tower through the filter medium replenishing pipe by the power source, thereby replenishing the filter medium in the filtration tower.

8. The filter medium replenishing device according to claim 7, wherein one end of the filter medium replenishing pipe is connected to the middle of the water passage pipe for the water to be treated, and the other end of the filter medium replenishing pipe is connected to the filter medium storage tank.

9. The filter medium replenishing device according to claim 7 or 8, wherein the power source is a pump.

10. The filter medium replenishing device according to claim 7, wherein an ejector is provided in the water passage pipe for the water to be treated as the power source, and by driving the ejector, the filter medium-containing water is supplied from the filter medium replenishing pipe to the filtration tower through the water passage pipe for the water to be treated.

11. A method for replenishing the filtration tower with particulate filter medium using the filter medium replenishing device according to claim 7, A filter medium replenishing method in which the filter medium is replenished in the filtration tower by supplying the filter medium-containing water from the filter medium storage tank to the filtration tower.

12. The filter medium replenishing method according to claim 11, wherein the mass ratio of water to filter medium in the filter medium-containing water is 1:1 to 10:

1.

13. A method for replenishing the filtration tower with particulate filter medium using the filter medium replenishing device according to claim 8 or 10, A filter medium replenishing method in which the filter medium is replenished in the filtration tower by supplying the filter medium-containing water from the filter medium storage tank to the filtration tower through the water passage pipe for the water to be treated together with the water to be treated.

14. A filter medium replacement method including at least one of extracting particulate filter medium from the filtration tower by the filter medium extraction method according to claim 5 and replenishing the filtration tower with new particulate filter medium by the filter medium replenishing method according to claim 11.

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