JPS598406B2 - Filter media regeneration device for filtration equipment - Google Patents

Description

[Detailed Description of the Invention] This invention provides a filtration device for factory wastewater, domestic wastewater, etc.
Related to a filter medium regeneration device for a filter device that regenerates the filter medium (separates and removes SS, oil, etc. from the filter medium) when the amount of pollutants (SS), oil, etc. deposited on the filter medium reaches the limit. It is.

In conventional filter media regeneration devices, cleaning water is generally introduced into the filter body to backwash the filter media, and the SS separated from the filter media is
Since SS is floated and discharged directly from the wastewater discharge pipe, the flow rate when discharging SS is limited to a range that does not cause filter medium Q carryover, making it difficult to completely separate and remove SS. However, it had the disadvantage of causing mud polling and channeling after long-term operation.

In addition, in order to eliminate these drawbacks, a cleaning tower and a pump are installed in the circulation passage that communicates between the upper and lower parts of the filter body, and a wire screen that communicates with the sewage discharge pipe is installed inside this cleaning tower to separate the filter medium and sewage. A device is known in which only sewage is discharged through gaps in the wire screen when the water flows through the washing tower, but with this device, the wire screen quickly becomes clogged and the sewage There was a drawback that the flow was poor and the operation had to be stopped frequently to eliminate clogging, resulting in poor operating efficiency.

In other words, both filter media with no contaminants attached and filter media with contaminants adhered to the wire screen will of course stick to the wire screen and cause clogging, and the filter media that is stuck will be permanently removed from the wire by the flow of sewage. The filter remains stuck to the screen, and other filter media with no contaminants attached or with contaminants attached adheres thereto in a polymeric manner, further promoting clogging. There was a problem.

Therefore, in order to solve the above-mentioned problem, there is a system in which a hydrocyclone is interposed between the suction pipe and the return pipe to solve the above-mentioned problem.

In other words, by spinning the raw water in a spiral, heavy filter media mixed in the raw water are centrifuged, and light pollutants are discharged from above along with the overflowing raw water (
JP-A-48-74651).

In such cases, if the filter media mixed in the raw water has pollutants attached to it and its apparent specific gravity has decreased, the filter media will flow out together with the overflowing raw water. There is a problem in that, as a result, the reduction rate of the filter medium is extremely large, and it is desired to improve the uneconomical efficiency.

Therefore, the present invention is designed to ensure that even when a filter medium with pollutants attached to it and its apparent specific gravity is flowing in as described above, the filter medium with the pollutants attached can be reliably removed. It is an object of the present invention to provide a filter medium regeneration device for a filtration device that can recover SS, continuously and efficiently separate the filter medium and SS, and can also expect the separation to be complete. .

The drawings showing the embodiments of the present application will be described below.

1 is a filter main body of a deep-bed type filtration device, and in this example, an open type one in which the upper part is open to the atmosphere is shown.
This may be a non-open type, a high pressure type, or the like.

Reference numeral 2 denotes a filter bed, which is constructed using various well-known filter media 3.

4 is a net for receiving the filter medium 3, and is stretched near the bottom of the filter body 1.

This net 4 may be omitted depending on the type and size of the filter medium 3.

Reference numeral 5 indicates a raw water supply pipe for supplying raw water such as factory wastewater or domestic wastewater into the filter body 1, and 6 indicates a liquid level control valve provided in the middle of the raw water supply pipe 5 to supply raw water into the filter body 1. The water level of raw water (hereinafter referred to as sewage) is maintained at a constant level.

In this embodiment, a valve using a float γ is shown, but it may be a solenoid valve using an electric detector.

Moreover, this liquid level control valve 6 can also be omitted.

8 is a filtered water discharge pipe, and an on-off valve 13 is provided in the middle.

Next, 9 is a container body, which is formed into a cylindrical shape.

Reference numeral 10 denotes a suction pipe that communicates the filter body 1 with the upper part of the container body 9, and as shown in FIG. The container body 9 is opened so that the liquid discharged from the discharge port 11 flows spirally inside the container body 9.

Reference numeral 12 denotes a return pipe that communicates the filter body 1 with the lower part of the container body 9. Inside the filter body 1, it is installed horizontally under the filter bed 2 as shown in the figure, and its tip is closed, and a large number of holes 14 are provided on the circumferential surface facing upward or sideways.

Reference numeral 15 denotes a pump interposed in the suction pipe 10, which is placed so as to be able to suck in liquid from the filter body 1 and discharge it into the container body 9.

In addition, this pump 15 may be interposed in the return pipe 12 when the filter main body 1 is of a closed type.

Next, reference numeral 11 is a sewage discharge pipe with one end facing toward the cylinder core near the center of the container body 9, and the other end connected to an appropriate next-process treatment device (not shown), with an on-off valve in the middle. 18 are provided.

The end face of the sewage discharge pipe 17 facing into the container body 9 is closed, and a number of communication holes 19 are provided in the side face as shown in detail in FIG. 3.

This communication hole 19 may be large or small, and may be formed arbitrarily.

Note that the end surface of the wastewater discharge pipe 17 may be left open.

Reference numeral 20 denotes a wire mesh that is removably placed over the sewage discharge pipe 11 facing into the container body 9, and surrounds the communication hole 19.

The mesh size of this wire mesh is set to an appropriate size so as not to allow the filter medium 3 to pass through.

This wire mesh 20 can be easily replaced with one having a different mesh size depending on the type and size of the filter medium 3.

When performing filtration work with the above configuration, raw water is supplied from the raw water supply pipe 5 into the filter main body 1 with the pump 15 stopped, as in a normal deep bed filtration device, and the filtered water is This can be done by opening the on-off valve 13 of the discharge pipe 8.

That is, when the raw water passes through the filter bed 2, SS, oil, etc. are filtered out, and only the filtered water flows out from the filtered water discharge pipe 8.
Desired filtration work can be performed.

Next, if the above-mentioned filtration work is continued for a long time and filtered SS and oil components adhere to the filter medium 3, resulting in poor filtration efficiency and the filter medium 3 needs to be regenerated, the following steps should be taken: In this way, the filter medium 3 is regenerated.

First, when the flow of filtrate from the filtrate discharge pipe 8 is stopped, the flow of raw water from the raw water supply pipe 5 is also stopped by the liquid level control valve 6.

After that, the pump 15 is started.

By starting this pump 15, the pump 15 moves to the filter main body 1.
The dirty water inside is sucked and moved to the return pipe 12 through the container body 9, and is ejected upward and sideways from the hole 14 of the return pipe 12.

This causes an upward flow of sewage inside the filter body 1, but since the speed of this flow is set in advance to be greater than the floating speed of the filter material 3, the filter material 3 that made up the filter bed 2 The filtered SS and the like are suspended in the water to form a slurry as a whole, and then a mixture of the filter medium 3, high concentration SS, and water is passed through the suction pipe 10 into the container body 9 through the discharge port 1.
It is discharged from 1.

The mixture of the filter medium 3, highly concentrated SS, and water discharged into the container body 9 flows spirally along the peripheral wall of the container body 9.

For this reason, the filter medium 3 having a large specific gravity is subjected to a large centrifugal force and is drawn toward the inner circumferential wall, and flows while contacting the inner circumferential wall surface or in a state where it is gathered near the inner circumferential wall surface.

At this time, SS, oil, etc. adhering to the surface of the filter medium 3 are completely removed due to the friction between the filter medium 3 and the inner circumferential wall and the friction between the filter mediums.

On the other hand, SS and oil have relatively low specific gravity, so they gather near the center of the container body 9.

In this case, the mixture of the filter medium 3, SS, and water is being actively fed into the container body 9 by the pump 15, and the water pressure in the container body 9 has increased to a certain extent, so the sewage discharge pipe 17 When the on-off valve 18 is opened, sewage containing high concentrations of SS and oil is discharged from the sewage discharge pipe 17.

On the other hand, regarding the filter medium 3, a wire mesh 20 that does not allow the filter medium 3 to pass is provided in the communication portion between the sewage discharge pipe 17 and the container body 9, and as described above, it is pushed toward the peripheral wall of the container body 9 by centrifugal force. Since there is a
2 and then returned to the filter body 1 again.

In the above case, it is necessary to replenish water equivalent to the amount of high-concentration wastewater discharged into the filter body 1, but this can be done by supplying raw water from the raw water supply pipe 5, and in this implementation In this example, this is done automatically by the action of the liquid level control valve 6.

By continuing the above operation for an appropriate period of time, SS, oil, etc. adhering to the filter medium 3 are successively separated and removed, and the filter medium 3
is played back.

Then, when the drive of the pump 15 is stopped, the regenerated filter medium 3 settles and accumulates within the filter main body 1 to form the filter bed 2, and thereafter the filtering work can be performed efficiently again.

Next, FIGS. 4 and 5 show embodiments in which the shape of the part inserted into the container body is different in the waste water discharge pipe. A wedge wire screen 21 is provided at the end of the waste water discharge pipe 17e, and this wedge wire screen 21 thin communication holes 21
Only waste water is discharged from a, and the filter medium is not discharged.

It should be noted that the present application is not limited to the above-described embodiment, and other suitable means may be adopted, such as providing a large number of small holes at the end of the wastewater discharge pipe so as not to discharge the filter medium.

In addition, although the above example shows the case of downward flow filtration, the essence is also relevant in the case of upward flow filtration, in which raw water is introduced from below and filtered water is discharged from above, depending on the nature of the raw water and the purpose of filtration. It can be implemented in the same way as above.

As described above, in this invention, the mixture of water, SS, and filter medium is discharged in a direction away from the cylindrical core of the container body 9, and the mixture is circulated at a high speed in a spiral shape inside the container body 9. The filter medium is collected on the inner circumferential wall surface of the main body 9, while the SS is collected in the center, and the filter medium and SS are separated through the return pipe 12 and the wastewater discharge pipe 17, respectively. The effect is that the work can be done continuously and quickly.

Moreover, in the separation process, the filter medium is moved along the inner peripheral surface of the container body 9 in an agitated state, so the SS adhering to the surface of the filter medium is scraped off. This has the effect that it can be carried out in a very rational manner, and also has the great effect that complete separation of the filter medium and SS can be expected.

Moreover, the above effect can be expected (become more effective) even if the flow velocity of the slurry-like mixture of water flowing from above the main body and the SS (!l: filter material) is set to a high flow velocity, so the separation work is It also has operational features that can satisfy the need to perform tasks in a short period of time.

Furthermore, in the present invention, the state in which the sewage discharge pipe 17 is attached to the upper part of the container body is a cylindrical sewage intake pipe that extends from the upper part of the container body 9 with the cylindrical core position of the container body 9 pointing downward into the container body. It has an entrance part (a part that is inside the container body 9),
Moreover, the sewage intake part in the container body 9 allows the passage of the above-mentioned pollutants, etc. (hereinafter referred to as pollutants, etc. including pollutants and oil) around it, but does not allow the passage of the above-mentioned filter medium. A large number of holes of an unacceptable size are formed in the vertical direction, and the inlet in the container body 9 (the part where the suction pipe 10 is connected) is
The raw water mixed with the filter material that flows into the container body from there flows around the container body in a spiral shape around the cylindrical core of the container body, and is directed to the lower discharge port (the part where the return pipe 12 is connected).
The raw water mixed with the filter material that flows into the container body 9 from the inflow port flows sequentially around the sewage intake part in the container body as the axis, and flows toward the lower part of the container body 9. In the process of heading towards the outlet, the filter medium rotates along the side wall of the container body due to centrifugal force, and is discharged toward the outlet, where dirt adheres to the filter medium and its apparent specific gravity becomes small. The filter medium 3 is designed to descend while rotating around the sewage intake part inside the container body, so that the filter medium 3
Among them, the apparent specific gravity is small due to the adhesion of pollutants, etc.
Even if the filter medium 3 is discharged together with the raw water toward the sewage discharge pipe 1T (in other words, it is not likely to be centrifuged toward the peripheral wall of the container body 9 by the raw water flowing in from the inlet). Even if the filter material is old),
The filter medium with pollutants is the sewage discharge pipe 1 inside the container body 9.
In the process of moving around the filter medium 3 along its peripheral wall, the pollutants adhering to the filter medium 3 are connected to the flow of raw water flowing into the wastewater discharge pipe 17 through the many holes of the wastewater discharge pipe 17. However, the filter medium 3 cannot flow into the sewage discharge pipe 17 through the holes, and as a result, the contaminants adhering to the filter medium 3 gradually decrease, and eventually the filter medium 3 It has the great advantage that its apparent specific gravity returns to its original value, and that the filter media mentioned above (filter media whose apparent specific gravity has been reduced due to adhesion of contaminants) can also be recovered from the discharge port.

This has an excellent effect in solving the problem that in the past, the filter medium with contaminants etc. attached thereto had a small apparent specific gravity and was therefore discharged together with the contaminants, resulting in a large loss of the filter medium.

Furthermore, an excellent feature of the present invention is that in the process of flowing the raw water mixed with filter media flowing from above the container main body 9 toward the discharge port below, the filter media does not have much contaminants attached to it, or the filter media does not have much contaminants attached to it. However, in the process of flowing, it separates, that is, it has a high specific gravity close to the specific gravity of the filter medium itself, and is separated by centrifugal force toward the peripheral wall of the container body and continues downward. While lowering the container, the container body has a large number of pores in order to separate only the filter media with properties that require forcible separation of the contaminants from the filter media that still have a lot of contaminants attached to them. The filter material is lowered while being rotated along the sewage discharge pipe, and the pollutants, etc., are absorbed from the holes of the sewage discharge pipe, and the pollutants are forcibly separated from the filter material. It has a big effect.

Moreover, after contaminants and the like are forcibly removed from the filter medium in this way, the apparent specific gravity of the filter medium becomes large, so that the filter medium is moved away from the waste water discharge pipe inside the container body 9, and the filter medium is moved away from the waste water discharge pipe 17. On the peripheral wall of the filter, the work of removing contaminants from the filter medium to which contaminants still adhere can be continued more effectively, and an extremely excellent effect is exhibited in removing contaminants from the filter medium.

(If the amount of contaminants attached to the filter media is large, the number of contaminants will gradually decrease, so the efficiency of removing contaminants from the remaining filter media will increase in inverse proportion to the decrease in the number of filter media that requires contaminant removal. Therefore, it is possible to effectively separate and remove contaminants from both filter media, ie, filter media from which contaminants are easily removed, and filter media from which contaminants are difficult to remove.

)

[Brief explanation of drawings]

The drawings show an embodiment of the present application, and FIG. 1 is a longitudinal sectional view showing the whole, FIG. 2 is an enlarged sectional view taken along the line ■-■ in FIG. 1, and FIG.
The figure is an enlarged front view of the sewage discharge pipe portion of FIG. 1, FIG. 4 is a front view showing another embodiment of the sewage discharge pipe, and FIG. 5 is an end view taken along line 1-v in FIG. 1... Filter body, 9... Container body,
10...Suction pipe, 12...Return pipe, 15
...Pump, 1T...Sewage discharge pipe.

Claims (1)

[Claims] 1 A filter body that has a large number of filter media inside and is designed to pass raw water through the filter media to filter out contaminants, etc. contained in the raw water, and the upper part contains the raw water mixed with the filter media. a cylindrical and tree-shaped container body having an inlet for inflowing raw water and an outlet at the bottom for discharging raw water mixed with filter media, and one end connected to the inlet of the container body. a suction pipe, the other end of which is connected to the outlet of the container body, and the other end of which is connected to the outlet of the container body, and the other end is configured to take in the raw water mixed with the filter material from the filter body; A return pipe that is capable of returning waste water, and a waste water discharge pipe that has one end attached to the container body and the other end that allows waste water to be discharged to the next stage, The raw water is allowed to flow into the container body from the inlet through the suction pipe, and the contaminants adhering to the filter material are separated from the filter material within the container main body, and the raw water mixed with the filter material is returned to the container body from the discharge port. In a filter media regenerating device of a filter device, the separated pollutants are discharged to the next stage through the sewage discharge pipe, and one end of the sewage discharge pipe is attached to the container body. The condition is such that a cylindrical sewage intake section extends from the top of the container body toward the cylindrical core position of the container body toward the bottom of the container body. has a large number of holes formed in the vertical direction around it that are large enough to allow the passage of the above-mentioned contaminants, but not the passage of the above-mentioned filter material, and furthermore, the inlet in the container body is connected to the container body from there. The raw water mixed with the filter material flowing into the container body is caused to flow in a spiral manner around the cylindrical core of the container body toward the discharge port below. During the process in which the raw water mixed with the filter material that has flowed into the container body sequentially revolves around the sewage intake part in the container body and heads toward the outlet at the bottom, the filter material is pushed against the side wall of the container body by centrifugal force. Rotate the filter material along its side wall toward the outlet, and remove the filter material whose apparent specific gravity has become smaller due to adhesion of contaminants, etc., around the sewage intake part in the container body. In the process, the pollutants adhering to the filter medium flow into the sewage intake part together with the raw water that flows into the sewage intake part from the many holes in the sewage intake part, and the sewage A filtering material of a filter device, wherein the filtering material is discharged through a discharge pipe, and the filtering material is configured to gradually increase in apparent specific gravity as contaminants adhering thereto are sequentially separated and move toward the discharge port. playback device.