JPH0763570B2 - Method and device for cleaning porous ceramic filter - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION <Industrial field of application> The present invention is applied to a filtration device capable of suitably removing impurities such as organic substances from water contaminated with pools and the like, particularly organic substances and inorganic substances. And a cleaning device for a porous ceramic filter.

<Prior Art> With the recent boom in fitness, more and more people are doing swimming as a whole body exercise suitable for promoting health and relieving stress, and more and more people are familiar with the pool regardless of age or sex.

Along with this, in order to enjoy swimming safely and hygienically, there is a growing interest in the hygiene conditions of the pool, especially the water quality, and the demand for water purification equipment that determines the water quality of this pool is becoming more and more stringent. There is.

Under such circumstances, a filter to which a porous ceramic filter is applied has been attracting attention as a filtering device for water purification equipment for pools.

The porous ceramic filter has an extremely fine filtration space three-dimensionally, which is preferable for filtration of a pool, particularly a hot water pool, and it has been impossible to filter with a conventional filter. Organic matter such as oil released from the human body can also be suitably filtered.

FIG. 7 conceptually shows a pool filtration device to which such a porous ceramic filter is applied.

In the filtering device of the illustrated example, a cylindrical porous ceramic filter 100 (hereinafter referred to as ceramic filter 100).
Is closed at its upper end surface with a lid 102 and fixed to the center of a hollow cylindrical housing 104.

An inline 108 for introducing water from the pool 106 is connected to the left side surface of the housing 104 in the drawing, and an outline 110 for returning the filtered water to the pool 106 is connected to the center of the bottom surface. A line 112 for introducing a filter aid is provided on the right side surface of the housing 104 in the drawing, an air vent 114 is provided on the upper surface, and a ceramic filter 1 on the lower surface is provided.
A drain line 116 is arranged outside 00. further,
A backwash line 118 for washing the ceramic filter 100 is branched and arranged in the outline 110.

When filtering the water in the pool 106 with such a filtering device, first, the air vent 114 and the valve 12 of the backwash line 118 are used.
0 and the valve 122 of the water distribution line 116 is closed. Then the valve 124 and the outline 110 of the in-line 108
By opening the valve 126 and driving the circulation pump 128 of the pool 106, the in-line 108, the housing 10
4. Circulate water in the order of outline 110. In other words, the water passes through the ceramic filter 100 in the direction of the black arrow a, the impurities are filtered by the ceramic filter 100, and the water is returned to the pool 106 as clean water.

<Problems to be Solved by the Invention> By the way, if such filtration of water is continued, the filter cake accumulates on the outer surface of the ceramic filter 100, and the extremely fine holes having the ceramic filter 100 are blocked.
In such a state, not only the filtration efficiency is lowered, but also in a severe case, it is necessary to replace the expensive ceramic filter 100. Moreover, since many ceramic filters 100 are usually used, the cost is extremely high.

Therefore, it is necessary to clean the ceramic filter 100 by removing the filter cake accumulated on the outer surface at regular intervals.

In general, such cleaning of the ceramic filter 100 uses a so-called jet water flow in which cleaning water and air are mixed and ejected at a high speed, and this jet water flow is indicated by a white arrow b from the backwash line 118. Ceramic filter 100
It is carried out by backwashing by spraying from the inner surface to the outer surface.

Such a backwash line 118 has an air tank 129 filled with high-pressure compressed air and a flash tank 130 filled with about 1/3 of wash water A, as disclosed in Japanese Patent Laid-Open No. 48-2252. The high pressure compressed air is injected from the air tank 129 to the flash tank 130 by opening the valve 132 disposed between the two, and a jet water flow is generated.

In the device shown in FIG. 7, the ceramic filter 10
When backwashing 0, first the circulation pump 128
To close valves 124 and 126 and then open valves 120 and 122 to complete the preparation.

Finally, by opening the valve 132, the air tank 129
Higher pressure compressed air is injected into the flash tank 130,
The pressure creates a jet of water and backwash line 118
In the direction of the arrow, from inside the ceramic filter 100,
After passing through the side wall in the direction of the white arrow b (backwashing), the filter cake and the like adhering to the outer surface of the ceramic filter 100 is dropped and discharged from the discharge line 116.

However, since the holes of the ceramic filter 100 are extremely fine, in order to perform good cleaning, the jet water flow used for backwashing requires a very high flow velocity, that is, a high cleaning pressure. Therefore, since it is necessary to fill the air tank 129 with a large amount of very high-pressure compressed air, the size of the air tank 129 is increased and the size of the entire filtration facility is increased, resulting in an increase in the cost of the entire facility.

Moreover, in order to reliably clean the ceramic filter 100, it is necessary to clean the ceramic filter 100 with a sufficient cleaning pressure for a relatively long time.

However, since such a conventional backwashing device forms a jet water flow by using the high-pressure compressed air filled in the air tank 129 having a constant volume as described above, the washing pressure is shown in FIG. As described above, after reaching the peak, it decreases in an extremely short time. Therefore, in order to maintain the required cleaning pressure for the desired time, a very large air tank 12
9 and a high-performance high-pressure air filling system are required, and a large amount of washing water is required, which further increases the cost of equipment and the running cost.

An object of the present invention is to solve the above-mentioned problems of the prior art, and in a liquid filtration device to which a porous ceramic filter is applied, it is possible to reliably and satisfactorily reverse this porous ceramic filter with inexpensive and small equipment. It is an object of the present invention to provide a cleaning method and a cleaning device for a porous ceramic filter that can perform cleaning.

<Means for Solving the Problems> In order to achieve the above-mentioned object, the present invention uses a cylindrical porous ceramic filter, and a liquid is passed through the porous ceramic filter side wall from one side surface to the other side surface. A method for cleaning the porous ceramic filter in a filtering device for filtering impurities contained in the liquid by circulating, comprising: a cleaning liquid supply source (54); and a cleaning liquid supply means (56),
Provided downstream of the supply source (54), the supply means (5
6) and a circulation path (58) for the cleaning liquid, which is a path connecting the upstream point and the downstream point of the supply means (56).
A high pressure air supply means (60) and the circulation path (58)
And downstream of the high pressure air supply means (60),
Using a mixing means (62) for injecting high pressure air into the cleaning liquid supplied from the supplying means (56) to mix the cleaning liquid and air to generate a two-phase flow, the cleaning liquid is supplied from the supply source (54) to the cleaning liquid. The cleaning solution is supplied to the circulation path (58), the cleaning solution is circulated by the cleaning solution supply means (56) with the circulation path (58) as a closed circuit, and the circulation path is closed after the supply means (56) rises. (58) is opened to supply the cleaning liquid to the mixing means (62), and in this mixing means (62), high-pressure air is jetted to the cleaning liquid to mix the cleaning liquid and air to generate a two-phase flow, and the porous liquid Cleaning the porous ceramic filter by supplying a two-phase flow of the high-pressure air and the cleaning liquid so that the side wall of the porous ceramic filter passes from the other side surface toward the one side surface in a direction opposite to the filtering direction. Special to do There is provided a porous cleaning method ceramic filter to.

Further, the present invention is a cleaning device for a porous ceramic filter in a filtration device comprising a cylindrical porous ceramic filter, comprising a cleaning liquid supply source (54) filled with a cleaning liquid, and this cleaning liquid supply source. The cleaning liquid supply means (56) for supplying the cleaning liquid filled in (54) and the cleaning liquid supply means (56) provided downstream of the supply source (54) are included. ), A circulation path (58) consisting of a path connecting the upstream side and the downstream side, and a supply means (60) for high pressure air.
And a means (60) for supplying the high pressure air to the cleaning liquid supplied by the means (56) for supplying the cleaning liquid, which is disposed downstream of the circulation path (58) and downstream of the means (60) for supplying the high pressure air. ) To inject high-pressure air to mix the cleaning liquid and air to generate a two-phase flow, and the two-phase flow generated by the mixing means (62) to the porous ceramic filter. Further, there is provided a cleaning device for a porous ceramic filter, characterized in that the cleaning device is provided with a backwash pipe (30) for supplying in a direction opposite to the filtration direction.

Further, it is preferable that the mixing means injects high-pressure air from the outer peripheral direction with respect to the flow of the cleaning liquid to generate the two-phase flow.

Further, it is preferable that the mixing means is configured to inject high-pressure air from the inside of the flow of the cleaning liquid in the direction of the flow of the cleaning liquid to generate the two-phase flow.

Further, the high pressure air supplied to the mixing means may be a two-phase flow in which the cleaning liquid and air are mixed in advance.

Further, it is preferable that the introduction of air in the mixing means is performed in substantially the same direction as the flow of the washing water.

Further, the cleaning method and the cleaning device are powdery and / or
Alternatively, it is preferable to have a means for supplying a fibrous filter aid.

<Embodiment> Hereinafter, a cleaning method and a cleaning apparatus for a porous ceramic filter according to the present invention will be described in detail with reference to preferred embodiments shown in the accompanying drawings.

FIG. 1 shows a pool to which a porous ceramic filter cleaning device (hereinafter simply referred to as a cleaning device) for carrying out the porous ceramic filter cleaning method (hereinafter simply referred to as a cleaning method) of the present invention is applied. An example of a water filtration system is shown conceptually.

In the filtration system shown in FIG. 1, the water in the pool 12 (hereinafter, simply referred to as water in the present specification) extends from the outer surface to the inner surface of a side wall of a porous ceramic filter (hereinafter referred to as a ceramic filter) 10. The water used in the pool, which is the object of filtration, is indicated), and this water is filtered by the ceramic filter 10 to be cleaned.

The ceramic filter 10 has a cylindrical shape,
The upper end surface is closed by a lid 14 and fixed to the center of the bottom of a hollow cylindrical housing 18.

In the filtration system of the illustrated example, an inline 20 for introducing water from the pool 12 is provided on the left side surface of the housing 18 in the figure.
However, on the right side, the auxiliary agent supply system 22 that supplies the filter auxiliary agent
However, an air bleeder 24 is provided on the top surface, a discharge line 26 is provided on the bottom surface, an outline 28 for returning water to the pool 12, and a branching from the outline 28 are arranged to reverse the ceramic filter 10 by the cleaning method of the present invention. Backwash line 30 to wash,
Connected respectively.

The inline 20 is configured by arranging a valve 32 and a prefilter 34, and connects a part of the pool 20 and the housing 18. The pre-filter 34 is for filtering large dust before filtering the water by the ceramic filter 10.

On the other hand, the outline 28 has a valve 36 and a circulation pump 38 that is a circulation drive source of water, and connects the pool 12 with the center portion of the bottom surface of the housing 18, that is, the portion corresponding to the inside of the cylinder of the ceramic filter 10. To do.

Therefore, in this filtration system, the water is pooled by the circulation pump 38 → the in-line 20 → the housing 18
(Ceramic filter 10) → outline 28 → pool 12
The water is passed through the side wall of the ceramic filter 10 from the outer side surface to the inner side surface as indicated by the black arrow a in the housing 18 to perform filtration.

The illustrated filtration system has an auxiliary agent supply system 22 as a preferred embodiment.

The auxiliary agent supply system 22 is for supplying a powdery filter auxiliary agent and a fibrous filter auxiliary agent as a filter auxiliary agent into the housing 18, and a so-called slurry pump 40 capable of liquid-sending a so-called slurry-like material and diatomaceous earth or A tank 44 filled with a mixture 42 of powdered filter aid such as lime and water, and a tank 44 filled with a mixture 46 of fibrous filter aid such as pulp fiber or asbestos and water
48, and valves 50 and 52 corresponding to each tank are arranged. Incidentally, stirring devices 44a and 48a for stirring the mixture to be filled are arranged in the respective tanks.

As described above, the ceramic filter 10 has three-dimensionally very fine pores capable of filtering oil and the like discharged from the human body. Therefore, if the ceramic filter 10 is directly used for filtration, the fine holes may be clogged and cleaning may become very difficult.

Therefore, using such a filter aid, on the outer surface of the ceramic filter 10, a peeling layer consisting of a powder filter aid layer that is easy to remove, and a filter layer consisting of a fibrous filter aid layer above it. It is preferable to form and filter using each of the auxiliary layers. With such a configuration, backwashing of the ceramic filter 10 is facilitated, and the effect of the washing method of the present invention can be further enhanced.

When forming each such filter aid layer, after thoroughly mixing the mixture with a stirrer, the valve corresponding to the filter aid layer to be formed is opened, and the slurry pump 40 a required amount of the mixture 42 or Supply 46 into the housing 18,
After the slurry pump 40 is stopped and the valve is closed, the circulation pump 38 may be driven to circulate in the same manner as when filtering water.

The filtration method using such a filter aid layer is described in detail in JP-A-63-143917.

Basically, in the filtration system of the illustrated example having such a configuration, a reverse filter equipped with a cleaning device for performing the cleaning method of the present invention, which removes the filter cake laminated on the side wall of the ceramic filter 10 and further the above-mentioned filter aid, The washing line 30 is branched from the outline 28 described above.

In the illustrated filtration system, the backwash line 30 is basically a so-called two-phase jet water flow that mixes water and air at a high speed and jets the ceramic filter in the direction indicated by the white arrow b. The cleaning device is for cleaning it by backwashing 10. The cleaning device includes a cleaning liquid supply tank 54 filled with the cleaning liquid, a cleaning liquid pump 56 for supplying the cleaning liquid, and a circulation path including the cleaning liquid pump 56. 58
And an air supply means 60, and a mixing unit 62 that mixes cleaning water and air into a jet water flow composed of a gas-liquid two-phase flow.

The cleaning liquid supply tank 54 is filled with the cleaning liquid that forms the two-layer jet water flow, and is various ordinary tanks.
The cleaning liquid applied to the cleaning method of the present invention is not particularly limited, and may be normal water, tap water, alkali having a cleaning effect, etc., depending on the intended use of the filtration system to be applied, such as pool water. It may be water containing a small amount of detergent, and various cleaning liquids can be applied.

The circulation path 58 is provided downstream of the cleaning liquid supply tank 54,
The cleaning liquid pump 56 is provided, and the cleaning liquid pump 56 has a path connecting the upstream point and the downstream point of the cleaning liquid pump 56. After supplying a predetermined amount of cleaning liquid from the cleaning liquid supply tank 54, a valve is provided.
Cleaning solution pump by closing 61 and 64 and opening valve 63
By driving 56, the cleaning liquid can be circulated in this closed circuit.

As described above, when backwashing the ceramic filter 10, it is preferable that the washing liquid (jet water flow) flow velocity and the washing pressure are high. In the cleaning apparatus of the present invention, by having such a circulation path 58 for the cleaning liquid, the cleaning liquid is circulated in the circulation path 58 before the cleaning is started, so that the cleaning liquid pump 56 is completely started up and the ceramic filter It is possible to exert its maximum capacity when backwashing 10.

The air supply means 60 supplies the mixing unit 62 with air for mixing with the cleaning liquid to form a jet water flow.

As the air supply means 60 applied to the present invention, various compressors capable of supplying the necessary and sufficient amount of air to the mixing unit 62, air supply means such as an air cylinder, and preferably high pressure air supply means. Is also applicable and is not particularly limited. In order to supply the high-pressure air more stably, a reserve tank or the like that can be filled with the high-pressure compressed air may be provided.

The mixing unit 62 forms a jet water stream by mixing the cleaning liquid and the air thus supplied.

FIG. 2 is a sectional view of the mixing unit 62 in the cleaning liquid advancing direction, and FIG. 3 is a sectional view of the same in the vertical direction (line III-III).

The mixing unit 62 of the illustrated example has a cylindrical shape, and has a cleaning liquid inlet 65, an air inlet 66, and an outlet 67 for the formed jet water stream.

The cleaning liquid supplied by the cleaning liquid pump 56 flows in from the cleaning liquid inflow port 65 and advances through the through hole 69 in the arrow x direction.
On the other hand, the high-pressure air from the air supply means 60 is supplied from the air inlet 66 as shown by the arrow y, passes through the cylindrical space 71 formed so as to fit the through hole 69, and then the through hole 69.
Eight nozzles 73 are formed so as to surround the nozzle 73 and are injected into the through hole 69 in the arrow direction.

Therefore, in the mixing unit 62 of the illustrated example, the cleaning liquid and the high-pressure air are mixed by injecting the high-pressure air into the cleaning liquid from the outer peripheral portion in the through hole 69 near the intermediate portion in the direction of the arrow x, and the gas-liquid 2 A jet water stream composed of phases is formed, discharged from the discharge port 67, and injected into the housing 18.

Various directions can be applied to the injection direction of the high pressure air into the through hole 69 other than the arrow direction in the illustrated example. However, as described above, it is preferable that the flow velocity of the jet water flow and the washing pressure are high in order to perform good washing. Therefore, at least in a direction that does not hinder the progress of the washing liquid, that is, in the arrow x direction, which is the direction of movement of the washing liquid. It is preferably directional.
Further, for the same reason, when the air jet direction is substantially the same as the arrow x direction, the air jetted into the through hole 69 is jetted at the jet pressure that can accelerate the speed of the cleaning liquid. Preferably.

Another example of the mixing unit applied to the present invention is shown in FIG.
A sectional view taken along the line VV is shown in FIG.

The mixing unit 62 shown in FIG. 2 injects high-pressure air from the circumferential direction of the through hole 69, that is, from the outer peripheral portion with respect to the flow of the cleaning liquid, but the mixing unit 80 shown in FIG. Is to jet high-pressure air from the inside of the cleaning liquid in the same direction as the flow to form a jet water flow.

The mixing unit 80 shown in FIG. 4 has a basically cylindrical shape similar to the above-mentioned mixing unit 62, and has a cleaning liquid inlet 82, an air inlet 84, and a formed jet water stream. And a discharge port 86.

In the mixing unit 80, the cleaning liquid supplied by the cleaning liquid pump 56 flows in from the cleaning liquid inlet 82 and the through hole 88.
In the direction of arrow x. On the other hand, the high-pressure air from the air supply means 60 is supplied from the air inlet 84 as shown by the arrow y, and the center line is aligned with the through hole 88, that is, high pressure is applied to the center line in the same direction as the flow of the cleaning liquid. A jet water flow is formed by being jetted from the nozzle 90 for jetting air into the through hole 88, and is supplied into the housing 18 through the discharge port 86.

Here, also in the mixing unit 80, the mixing unit described above.
Similar to 62, in order to improve the cleaning effect, the air injected into the through holes 88 is preferably injected at a pressure that can accelerate the speed of the cleaning liquid.

The mixing means of the cleaning liquid and air applied to the present invention is not limited to the mixing units 62 and 80 of the illustrated example, and various known gas-liquid mixing means can be applied.

According to the cleaning device of the present invention which basically has the above configuration,
The cleaning liquid supplied from the cleaning liquid pump 56 having the maximum capacity and the high-pressure air supplied from the air supply means 60 are used to form a jet water flow by the mixing unit 62. Therefore, as shown by the dotted line in FIG. 8, a jet water flow having a sufficient cleaning pressure can be continuously supplied, and a large-sized or large number of conventional high-pressure air or cleaning liquids can be supplied. The ceramic filter 10 can be satisfactorily and reliably washed without using an air tank or a cleaning liquid tank. Further, for the same reason, both the cleaning liquid and the high-pressure air can be reduced in quantity as compared with the conventional one, so that the running cost of the filtration system can be significantly reduced.

In the above example, only the high pressure air is mixed with the cleaning liquid sent from the cleaning liquid pump 56 in the mixing unit 62 (80), but the present invention is not limited to this, and the sixth embodiment, for example, As shown in the figure, air supply means
Second cleaning liquid supply tank 92 and high pressure pump 94 together with 60
A high-pressure air is supplied from the air supply means 60, the cleaning liquid is supplied by the high-pressure pump 94, and a jet water flow, which is a two-phase flow in which the air and the cleaning liquid are mixed in advance, is jetted to the mixing unit 62 to wash the cleaning liquid pump. It may be mixed with the cleaning liquid delivered by 56.

When cleaning the ceramic filter by the backwash line 30 of the illustrated example, first, the valve 64 is closed, and the valves 61 and 63 are closed.
The circulation path by opening the
The washing liquid is circulated in the 58. It should be noted that the valve 61 may be closed when a sufficient cleaning liquid is supplied into the circulation path 58.

During this time, the valves 32 and 36 and the air bleeder 24 are closed,
Further, the valve 68 of the discharge line 26 is opened.

Next, when it is confirmed that the circulation of the cleaning liquid in the circulation path 58 is performed at the maximum output of the cleaning liquid pump 56, the valve 70 disposed downstream of the mixing unit 62 is opened to open the backwash line 30. Then open valves 61 and 64,
The valve 63 is closed, and the valve 72 of the air supply means 60 is further closed.
Is opened to supply high-pressure air to the mixing unit 62, and the mixing unit 62 forms a jet water flow, which is jetted into the ceramic filter 10.

The jet water flow injected into the ceramic filter 10 is
As shown by the white arrow b, the ceramic filter 10 is passed from the inner side surface to the outer side surface to remove the filter residue, etc.
It is dropped from the outer surface of 10 and is discharged to the outside through a discharge line 26 together with these.

The cleaning method and the cleaning device for the porous ceramic filter according to the present invention have been described above in detail. However, the present invention is not limited to this, and various changes and improvements can be made without departing from the scope of the present invention. Of course, it is good.

<Effects of the Invention> As described in detail above, according to the cleaning method and cleaning device for a porous ceramic filter of the present invention, in a liquid filtering device to which a porous ceramic filter is applied,
Since it is possible to reliably and satisfactorily backwash this porous ceramic filter with an inexpensive and small-sized facility, it is possible to remove water such as pool water or fine contaminants, especially water contaminated with organic or inorganic substances. The cost of the entire filtration system can be significantly reduced. Moreover, since the amount of washing water and high-pressure air for forming the jet water flow can be significantly reduced as compared with the conventional filtration system, the running cost of the filtration system can be significantly reduced.

[Brief description of drawings]

FIG. 1 is a view conceptually showing a pool filtration system adopting the method for cleaning a porous ceramic filter of the present invention. 2 and 3 are schematic cross-sectional views of the mixing unit applied to the filtration system shown in FIG. 4 and 5 are schematic cross-sectional views of another example of the mixing unit applied to the filtration system shown in FIG. FIG. 6 is a view conceptually showing another example of the air supply means of the pool filtration system adopting the method for cleaning a porous ceramic filter of the present invention. FIG. 7 is a view conceptually showing a pool filtration system adopting a conventional method for cleaning a porous ceramic filter. FIG. 8 is a graph showing the change over time in the cleaning pressure of the porous ceramic filter. Explanation of symbols 10,100 …… Porous ceramic filter, 12,106 …… Pool, 14,102 …… Lid, 18,104 …… Housing, 20,108 …… In-line, 22… Auxiliary supply system, 24,114 …… Air bleeding, 26,116 …… Discharge Line, 28,110 …… Outline, 30,118 …… Backwash line, 32,36,50,52,61,63,64,68,70,72,120,122,124,126,132
…… Valve, 34 …… Pre-filter, 38,128 …… Circulation pump, 40 …… Slurry pump, 42,46 …… Mixture, 44,48 …… Tank, 44a, 48a …… Stirrer, 54,92 …… Cleaning liquid supply Tank, 56 ... Washing liquid pump, 58 ... Circulation path, 60 ... Air supply means, 62,80 ... Mixing unit, 65,82 ... Washing liquid inlet, 66,84 ... Air inlet, 67,86 ...... Discharge port, 69,88 …… Through hole, 71 …… Space, 73,90 …… Nozzle, 94 …… High pressure pump, 129 …… Air tank, 130 …… Flash tank

Claims (5)

[Claims] 1. A cylindrical porous ceramic filter is used,
A cleaning method for the porous ceramic filter in a filtering device for filtering impurities contained in the liquid by circulating the liquid from one side surface to the other side surface of the porous ceramic filter side wall, the method comprising: A supply source (54) for the cleaning liquid, and a cleaning liquid supply means (56),
Provided downstream of the supply source (54), the supply means (5
6) and a circulation path (58) for the cleaning liquid, which is a path connecting the upstream point and the downstream point of the supply means (56).
A high pressure air supply means (60) and the circulation path (58)
And downstream of the high pressure air supply means (60),
Using a mixing means (62) for injecting high pressure air into the cleaning liquid supplied from the supplying means (56) to mix the cleaning liquid and air to generate a two-phase flow, the cleaning liquid is supplied from the supply source (54) to the cleaning liquid. A cleaning solution is supplied to the circulation path (58), the cleaning solution is circulated by the cleaning solution supply means (56) with the circulation path (58) as a closed circuit, and the circulation path is closed after the supply means (56) rises. (58) is opened to supply the cleaning liquid to the mixing means (62), and in this mixing means (62), high-pressure air is jetted to the cleaning liquid to mix the cleaning liquid and the air to generate a two-phase flow, and the porous liquid Cleaning the porous ceramic filter by supplying a two-phase flow of the high pressure air and the cleaning liquid so that the side wall of the porous ceramic filter passes from the other side surface toward the one side surface in a direction opposite to the filtering direction. Special to do Porous method for cleaning ceramic filters to. 2. The method for cleaning a porous ceramic filter according to claim 1, wherein the mixing means injects high-pressure air from the outer peripheral direction with respect to the flow of the cleaning liquid to generate the two-phase flow. 3. The mixing means injects high-pressure air from the inside of the flow of the cleaning liquid in the direction of the flow of the cleaning liquid,
The method for cleaning a porous ceramic filter according to claim 1, wherein a phase flow is generated. 4. The method for cleaning a porous ceramic filter according to claim 1, wherein the high-pressure air supplied to the mixing means is a two-phase flow in which a cleaning liquid and air are mixed in advance. . 5. A cleaning device for a porous ceramic filter in a filtering device comprising a cylindrical porous ceramic filter, comprising a cleaning liquid supply source (54) filled with cleaning liquid, and a cleaning liquid supply source (54). A cleaning liquid supply unit (56) for supplying the cleaning liquid filled in the unit (54), and a cleaning liquid supply unit (56) provided downstream of the supply source (54), and including the cleaning liquid supply unit (56) Circulation path (58) consisting of a path connecting the upstream side and the downstream side of the, and a high pressure air supply means (60)
And a means (60) for supplying the high pressure air to the cleaning liquid supplied by the means (56) for supplying the cleaning liquid, which is disposed downstream of the circulation path (58) and downstream of the means (60) for supplying the high pressure air. ) To inject high-pressure air to mix the cleaning liquid and air to generate a two-phase flow, and the two-phase flow generated by the mixing means (62) to the porous ceramic filter. 1. A cleaning device for a porous ceramic filter, comprising: a backwash pipe (30) for supplying in a direction opposite to the filtration direction.