JPH0779673B2 - Beer filtration equipment - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filtering device for continuously removing foreign substances such as yeasts existing in beer in a beer manufacturing process. The present invention relates to a filtration device that enables in-line filter regeneration in the process in which the resin cartridge filter and the like are used.

[0002]

2. Description of the Related Art In recent years, filtration of products or utilities is indispensable regardless of liquid or gas in all industrial fields such as food, medicine, chemistry and water treatment. Among them, it is well known that the foreign matter to be removed becomes finer as the process proceeds to the final step, and that a disposable resin cartridge filter or the like is generally used in this step.

In the beer production process, it is necessary to filter the beer after the so-called post-fermentation to remove the bacteria. In this case, a large number of resin cartridge filters are used in the final step after performing pretreatment filtration using an auxiliary agent such as diatomaceous earth.

[0004]

However, since the resinous cartridge filter has low mechanical strength, there is a risk of damage if the flow rate / pressure conditions are bad, and strong physical cleaning such as flushing cannot be performed.

Due to the characteristics of the material and the structure, there is a risk of deterioration of the filter medium and residual of chemicals, and chemical cleaning with chemicals is not generally performed. Further, generally, the filtration resistance is large and the filtration flow rate per unit area cannot be obtained. There is a risk of deterioration at high temperatures, and steam sterilization at temperatures above 120 ° C cannot be expected.

[0006] Therefore, this resin cartridge filter is generally difficult to regenerate, and replacement work that cannot be automated because it is used as a disposable product occurs, and the operating cost becomes large, so that a beer filter that replaces this is used. Is required to be developed. Further, as described above, the resinous cartridge filter cannot take a large filtration flow rate per unit area, and the filtration area must be increased in order to increase the throughput, which increases the number of filters. On the other hand, in the method using the auxiliary agent, extra equipment for treating the auxiliary agent is required, and in this case also the apparatus becomes large in size, and the apparatus cannot be made compact.

In view of the above situation, according to the present invention, beer can be surely filtered, without using an auxiliary agent, the mechanical strength of the filter medium is large, and the beer can be repeatedly used by in-line washing and regeneration. It is an object of the present invention to provide a filter device which is equipped with a filter element, and which incorporates a filtration process and a regeneration process into one system and constitutes an in-line regeneration system, thereby significantly reducing the filtration cost and yet providing a compact filtration device.

[0008]

In order to solve the above-mentioned problems, the present invention provides a device for filtering beer, which comprises:
A main filter for filtering beer, which comprises a sintered filter body containing at least metal fibers, a sub-filter for filtering a cleaning fluid supplied to the main filter, and a main filter connected to the main filter. A buffer tank for temporarily storing an appropriate amount of fluid for flushing in order to regenerate clogging of the filter, and the filter body provided with the main filter and containing metal fibers has a nominal filtration accuracy of 0.3 μm. Over 2.
It was configured to be less than 0 μm.

[0009]

In the beer filtering device of the present invention, the filter body provided in the main filter is formed by containing metal fibers, and the filter body containing the metal fibers has a nominal filtration accuracy of 0.3 μm. Since it is configured to exceed 2.0 μm, beer can be reliably filtered, and in-line filter regeneration is extremely easy and reliable, which enables economical operation of the device. A significant reduction in filtration cost and effective use of space can be achieved.

[0010]

The beer filtering device of the present invention will be described in detail below with reference to FIG. This device is an example of performing sterilization filtration of brewer's yeast in the final filtration stage during the beer manufacturing process.

The filtering apparatus of the present invention is roughly divided into a filter unit F in the right area and a cleaning unit C in the left area, which are surrounded by a two-dot chain line for convenience as shown in FIG. In the case of the present embodiment, the filter unit F plays a role of sterilizing filtration of brewer's yeast. That is, as shown in the lower part of the figure, the stock solution inflow pipe 10 has a valve V
1. A pressurizing pump P is provided, and when passing through the pressurizing pump P, the piping is connected to main filters 30-1 to 30-N described later.
Is branched into N corresponding to the number of. The branched pipes are connected to the first connection port side (downward) at one end of each of the main filters 30-1 to 30-N. The valves V2-1 to N are provided on the front side of the connection. Further, drain pipes 31-1 to N and valves V3-1 to N are provided on the first connection port side of the main filters 30-1 to 30-N, respectively.

The main filter 30-1 is, for example, as shown in FIG.
As shown in the schematic diagram of FIG.
And a plurality of filter elements 30 arranged therein
b. The filter element 30b is formed from a sintered filter body.

The filter body is composed of a sintered body containing at least metal fibers. The nominal filtration accuracy of the filter body containing metal fibers is more than 0.3 μm and less than 2.0 μm, and more preferably 0.6 μm or more and 1.5 μm or less. If this value is 2.0 μm or more, the brewer's yeast cannot be collected and the so-called disinfection effect is reduced. On the other hand, when this value is 0.3 μm or less, the filter is clogged, so-called backwashing cannot be performed, and the filter cannot be reused and reused. Here, the nominal filtration accuracy means a particle diameter (μm) that shows a collection efficiency of 95% when a collection efficiency curve is created when the test powder is used as a contaminant.

The metal fiber has a diameter of 50 μm or less, and has the same diameter and a predetermined length along the longitudinal direction. For example, a long fiber obtained by cutting the metal fiber tow into a sliver shape or , The grain is subjected to a grain adjusting treatment,
This is a short fiber having an aspect ratio (ratio of length / diameter) of about 3 to 50 obtained by cutting this in an acid solution by intergranular corrosion. The diameter of the metal fiber used in the present invention is 2 to 20 μm,
The thickness is preferably 4 to 12 μm, more preferably 4 to 8 μm. The aspect ratio of the metal fiber used in the present invention is 3 to.
50, preferably 3 to 20, more preferably 5 to 10. If both the diameter and the aspect deviate to the larger side, the porosity tends to decrease and the short fibers themselves tend to become entangled, resulting in non-uniform porosity and a wide pore size distribution. . On the other hand, if both of them deviate to the smaller side, the strength is deteriorated and the particles are formed into particles, so that there is a disadvantage that it is impossible to form a stable sintered body having fine voids.

As a material of such a fiber, for example, a material having excellent heat resistance and corrosion resistance such as stainless steel, Inconel, and Hastelloy is preferable. These metal fibers may be used alone or depending on the intended use, or may be a mixture of fine metal powders of the same type or different types as those fibers, for example, atomized powders, and sintered to obtain a filter. In particular, the one obtained by sintering the mixed powder of the metal short fiber and the metal atomized powder has an advantage that the pressure loss can be kept low while maintaining the high pore diameter, and the large filtration pressure is applied to the filtration surface. For applications in which the heat treatment is applied, a product obtained by sintering the long metal fibers is particularly preferable. In this case, the same effect can be achieved with a mixture of the long fibers and the short fibers.

As the metal fine powder contained above, atomized powder of stainless steel powder having a size of 10 to 100 μm, preferably 10 to 80 μm, and more preferably 20 to 70 μm is used. The mixing of the metal fibers and the fine metal powder is 4: 1 to 1: 4, preferably 7: 3 to 3: 7.
Is.

The filter body containing such metal fibers is manufactured by various known sintering methods. The sintered filter body has a porosity of 30 to 55%, preferably 45.
˜50%, more preferably 48 to 50%. If this value is less than 30%, the disadvantages of increased pressure loss and shortened life of the filter body occur. If this value exceeds 55%, the strength of the filter body may be reduced, or the width of the pore size distribution may be increased.

As described above, since the filter body containing metal fibers or the like has high mechanical strength, it is not necessary to make the filter thick, and the pressure loss of the fluid passage can be small. Thickness is 1
It is about 3 mm, preferably about 2 mm. The filter used in the present invention has a narrow pore size distribution and a uniform pore size.

As shown in FIG. 2, such a filter body is formed in a cylindrical shape having a bottom, and a plurality of filter bodies are usually arranged substantially uniformly in the housing. Specifically, φ70 mm
For example, one, three, or seven tubular filter bodies of x750 mm are mounted in the housing.

By using such a filter, the sterilization filtration of brewer's yeast can be reliably performed, and the recycling can be facilitated. It is also possible to wash and regenerate and sterilize using chemicals.
The shape of the filter body is not limited to the above-mentioned tubular shape, and a disk-shaped (disk-shaped) shape or the like can be expected to have the same effect.

By the way, normally, another main filter 30 is used.
The configurations of −2 to N are similar to those of the main filter 30-1. The pipe provided on the second connection port side (upper side) at the other end of the main filter 30-1 is the first
The pipe 15a and the second pipe 15b are branched, and the first pipe 15a is further branched into a third pipe 16a and a fourth pipe 16b. The first pipe 15a and the second pipe 15b are respectively
The valves V4-1 and V5-1 are provided, and the third pipe 16a is provided.
Valves V6 and V15 are provided on the fourth pipe 16b and the fourth pipe 16b, respectively. The second pipe 15b is connected to the main pipe 17, and the main pipe 17 is connected to the cleaning unit C side described later as shown in the drawing.

The fourth pipe 16b is connected to the pipe 61 on the cleaning unit C side, and is connected to the buffer tank 70 via valves V15 and V9. In addition, other main filter 3
Similarly to the main filter 30-1, 0-2 to N are arranged in parallel as shown. The number of main filters used is N for convenience here, but is not particularly limited.

In the case of this embodiment, the cleaning unit C is equipped with two filters, a utility filter 40 and a chemical solution filter 60 as sub-filters, on the left side of the drawing, and a buffer tank 70 on the right side of the drawing. ing. The filtering accuracy of the sub-filter is required to be equal to or higher than that of the main filter. The filter body of the sub-filter may be either a resin cartridge filter or a sintered body containing metal fibers. The basic configurations of the utility filter 40 and the chemical liquid filter 60 are similar to those of the main filters 30-1 to 30-N. A fluid introduction pipe 41 and a drain pipe 42 for introducing a cleaning fluid such as water, hot water, or steam are provided on the first connection port side (downward) of one end of the utility filter 40, and the other end of the utility filter 40 is provided. A branched first pipe 45 and a second pipe 46 are provided on the second connection port side (upper side), the first pipe 45 is further branched into a third pipe 47a and a fourth pipe 47b, and the second pipe 46 is , Is connected to the upper part of the buffer tank 70 through a branched pipe 48 as shown, the third pipe 47a is connected to the lower part of the buffer tank 70, and the fourth pipe 47b is connected to the raw liquid inflow pipe 10 of the filter unit. Has been done.

A valve V17 and a valve V18 are provided in the fluid introduction pipe 41 and the drain pipe 42, respectively.
And a valve V19 and a valve V20 are provided in the first pipe 45 and the second pipe 46 near the upper portion of the utility filter 40, respectively.

The chemical filter 60 is provided with parallel piping similar to the utility filter 40.
A chemical solution or the like is mainly introduced into the chemical solution filter 60. The buffer tank 70 is a tank used for washing with water or hot water, flushing, cleaning with a chemical solution, etc., and a valve V12 and a valve V7 are provided in the third pipe 47a and the pipe 48 below and above the tank 70, respectively. It is provided. Further, a drain pipe 51 is provided below the tank 70 via a valve V13, an air introduction pipe 53 is provided above the tank 70 via a valve V8, and a trunk side portion of the tank 70 is provided via a valve V9. Piping 61 is provided. A bypass pipe 55 is provided in the pipe 61 so as to sandwich the valve V9 via the valves V10 and V11, and a heat exchanger HE is installed in a part of the bypass pipe 55 so that heat can be appropriately exchanged. There is.

The pipe 61 communicates with the third pipes 16a and 16b of the filter unit F through a valve V15. A method of operating the above-described filtration device will be described. (1) Filtration step using the filter unit F (step of passing beer through main filter and extracting beer filtrate) Valves V14, V15, V16 are closed, and the filter unit F and the washing unit C are shut off.

Valves V2-1 to N, valves V4-1 to V4-1
By opening N and operating the pressurizing pump P, the beer stock solution is taken into the device and passed through the main filter,
Then, it is taken out of the system as a filtrate. Appropriate ON-OF by opening and closing valve V1 or valve V6 as appropriate
F driving can also be performed. Further, the flow rate may be controlled as needed. (2) Washing step-1 This is a step of reclaiming clogging of the main filter by washing with water or hot water, flushing, and washing with a chemical solution. 1) First, close the valves V1 and V6, and then open the valves V15 and V6.
Open 16 2) Next, wash with water or hot water according to the following procedure.

Valves V17, V19 and valve V2-1
~ N, open valves V4-1 ~ N, valves V9 and V
Open 13 to form the discharge line. Water or hot water is fed, the pressure pump is rotated, and cleaning water is discharged while being discharged out of the system. If necessary, the valve V12 is opened and V13 is closed to switch to the circulation line for cleaning.

Each part of the pipe is blow-cleaned. 3) Perform flushing. The procedure is as follows (however,
The order of 2) and 3) is appropriately exchanged if necessary).

After opening the valves V17, V19 and V12 and filling an appropriate amount of water in the buffer tank and closing the valve V12, the valve V8 is opened to introduce air to an appropriate pressure (only air may be introduced in some cases. ).

After closing the valve V8, the valves V7, V14 and the valve V3-i (where i is 1 to N
The arbitrary number selected from the above) and the valve V5-i are opened to flush the main filter.

The above and are repeated from i = 1 to i = N (repeating an appropriate number of sets). After the above, add water and air by
After closing valve V12, valves V7, V22, V24
Open and flush the chemical filter (repeating an appropriate number of sets).

According to the procedure, water and air are filled, the valve V12 is closed, and then the valves V7, V18 and V20 are opened to flush the utility filter (appropriate set number is repeated). In this embodiment, the case where the chemical liquid filter and the utility filter are recycled is described. However, these may be made disposable such as a resin filter and the flushing operation may be eliminated. 4) At the time of blockage or at regular intervals, the chemical solution is washed as necessary according to the following procedure.

The valves V21, V23 and V12 are opened to fill the buffer tank with the chemical solution. After closing the valves V21, V23, V12, the valve V
Open 17, V19 and V12 and introduce water or hot water to an appropriate level to dilute the chemical solution.

The valves V17 and V19 are closed, and the valve V
16, when valves V2-1 to N, valves V4-1 to N, and valve V15 are opened and heating (warming) is required, the valve V
10 and valve V11, otherwise valve V9
Open.

The pressurizing pump is rotated and the buffer tank is circulated as a buffer for a predetermined time. After the circulation is completed, the pressurizing pump is stopped and all blows are performed, or the valve 12 is closed and the valves V17, V19, V1 are closed.
Open 3 and push out with water or hot water to wash.

The above steps (1) to (3) are performed with a combination of a predetermined chemical solution having a predetermined concentration. An example is shown below. 0.5 to 5% NaOH 60 to 95 ° C 30 minutes 0.5 to 3% HNO ₃ room temperature to 85 ° C 30 minutes (3) Washing step-2 Step of sterilizing with hot water, chemical solution and steam 1) Perform hot water sterilization . The procedure is (2) -4) above,
Corresponding to the case where no chemical solution is injected (for example, hot water only, 8
0-95 ° C 30 minutes). 2) Perform chemical solution sterilization (NaClO, etc.). The procedure corresponds to the case of using a bactericide as a chemical in (2) -4) (for example, 20 to 50 ppm, NaClO, normal temperature, 30 minutes). Circulate or place as needed. 3) Perform steam sterilization.

The operation method based on the configuration of the filter device shown in FIG. 1 has been described above. By the way, the filter unit F of the filter device of the present invention, in particular, can be replaced with a filter unit F _o of another mode as shown in FIG. That is, as shown in FIG. 3, a plurality (N in the case of this embodiment) of main filters 30-1 to 30-N are provided in parallel to the piping system. Among them, the main filter 30-1 will be described below as a representative. On the first connection port side (lower side) at one end of the main filter 30-1,
A stock solution inflow pipe 91 having a pressurizing pump P1 for introducing the beer stock solution, and a circulation pump P connected to the cleaning unit.
A cleaning pipe 92 including 2 and a drain pipe 93 are branched and provided. The stock solution inflow pipe 91 is provided with valves V90 and V88-1 as shown in the drawing and a cleaning pipe 92.
Are provided with valves V82 and V86-1, and the drain pipe 93 is provided with a valve V87-1.

On the other hand, on the second connection port side (upper side) of the other end of the main filter 30-1, three pipes, a first pipe 95, a second pipe 96, and a third pipe 97, are provided from the outlets thereof. Valves V83-1, V84-1, and V85-1 are provided in the vicinity of the filter of the pipe that is branched.

The pipe 95 is connected via a valve V80.
Connected to the cleaning unit side pipe 46 (FIG. 1),
6 is a pipe 6 on the cleaning unit side via a valve V81.
1 (FIG. 1), the pipe 97 is connected to the filtrate pipe via a valve V89.

Such a pipe group is similarly piped in parallel for the other main filters 30-2 to 30-N as shown in FIG. This allows filtration and cleaning of the filter to be performed simultaneously. The operating procedure is as follows. 1) Main filter for filtration (in principle (N-1)
For the main filter used simultaneously), refer to valve V85-
X, V88-X is opened, and the pressurizing pump P1 is rotated with the valves V89, V90 open. 2) When the filter cleaning is performed simultaneously with 1), the valves V85-i and V88-i are closed for the predetermined main filter (No. i), and the valves V83-i and V84 are closed.
-I, open the valve V86-i, valve V80, V8
1. Open and close 1, V82, V87-i as appropriate to (2) above.
Perform the operation of (3).

Next, the effects of the present invention were further confirmed by showing concrete experimental examples as shown below. (Experimental Example 1) Test of nominal filtration accuracy and beer filtration performance According to the filter material specifications shown in Table 1 below, nominal filtration accuracy of 0.3 μm, 0.6 μm, 1.0 μm, 1.5 μm,
Test pieces of five kinds of 2.0 μm filter bodies were manufactured (filter body samples 1 to 5). The filtration area of each test piece is 10
It was set to cm ² .

[0043]

[Table 1] These filter sample samples 1 to 5 were incorporated into a small bench-top experimental apparatus and tested for sterilizing ability and in-line reproducibility.

The disinfection capacity was measured by measuring the yeast concentration in the treated beer solution that passed through the filter sample. The yeast concentration in the beer solution before filtration is 5 × 10 ^4.
cells / ml. For in-line regenerator, it was confirmed whether or not the filter body could be easily regenerated by backwashing (flushing).

The results of these experiments are shown in Table 2 below.

[0046]

[Table 2] The results shown in Table 2 show the following. That is, with a filter having a nominal filtration accuracy of 0.3 μm, the in-line reproducibility is difficult, although the sterilization ability is excellent. Further, with a filter body having a nominal filtration accuracy of 2.0 μm, although the in-line reproducibility was excellent, the sterilizing ability was insufficient, and brewer's yeast was detected in the beer filtrate. Nominal filtration accuracy 0.6 μm to 1.5 μm
The filter of (1) has extremely excellent sterilizing ability and in-line reproducibility. (Experimental Example 2) Beer yeast liquid filtration test Filter sample 3 in Table 1 above (nominal filtration accuracy 1.0
(3 μm) test piece (filtration area 10 cm ² ) was used to perform a filtration test of three types of brewer's yeast liquid. The results are shown in Table 3 below.

[0047]

[Table 3] From this result, it was confirmed that this filter has a sufficient sterilizing ability against various types of brewer's yeast. (Experimental Example 3) Brewer's yeast liquid filtration test The same filter body sample 3 (nominal filtration accuracy 1.0 μm) as the above test was used as a cylindrically shaped element as shown in FIG. A main filter was prepared by inserting this (filtering area 1 m ² ), and using the device shown in FIG. 1, the beer mixed with the brewer's yeast was poured in a state very close to the actual filtration, and the bacteria in the stock solution and the filtrate were filtered. Body concentration was measured. Further, in order to know the relative performance of the filter, beer was also poured under the same conditions on a polypropylene filter cartridge filter (nominal 1.2 μm) currently used for disinfection filtration, and comparison was made. The results are shown in Table 4 below.

[0048]

[Table 4] From this result, it was confirmed that the device of the present invention has a brewer's yeast removal capacity equivalent to that of the conventional cartridge filter under the conditions of actual operation.

(Experimental Example 4) Beer yeast liquid filtration / repetition regeneration test A beer yeast liquid filtration / repetition regeneration test was conducted using the filtration apparatus of the present invention shown in FIG. In addition, the results of the same test were compared with a conventional use example of the above resin cartridge filter.

As a result, in the case of the filtration device of the present invention, 94
0 kl / m ² (flushing is performed every 67 kl / m ² ) After filtration, flushing and alkali washing (2% N
aOH), the filtration pressure difference was initially 1.0 kg.
What increased from / cm ² to 1.6 kg / cm ² ,
It recovered to 1.2 kg / cm ² . On the other hand, in the comparative example of the resinous cartridge filter, recovery by washing was hardly recognized.

Further, since the filter body used in the present invention can be reused by washing, it can be used for a long period of time with the same filter body still attached. The filter life of the filter of the device of the present invention and the resin cartridge filter as a comparative example were compared by giving more specific numerical values. The results of filter specifications and filter life are shown in Table 5 below.

[0052]

[Table 5] The resin cartridge filter is a two-stage filtration system in which a prefilter and a final filter are connected in series in order to maximize the filter life.

The filter of the apparatus of the present invention was subjected to a backwashing regeneration process once a day, and the resinous cartridge filter was sequentially washed with hot water. From the results of Table 5, the resin cartridge filter of the comparative example had a filter life per unit area of 11.9 to 47.2 kl / m ² , while that of the filtration device of the present invention was 6030 kl / m ^2. Even if it exceeded m ² , it was still in a filterable state.

By the way, in the present embodiment, the sterilization filtration of brewer's yeast in the beer manufacturing process has been described above, but the present invention is not limited to this, and it can be applied to the filtration of various liquids. Nor.

[0055]

As described above, the filtering device of the present invention has the filter unit and the cleaning unit for cleaning the liquid integrated with each other, and the filter body of the main filter provided in the filter unit contains metal fibers. Nominal filtration accuracy exceeds 0.3 μm and less than 2 μm. Therefore, in addition to being able to reliably filter brewer's yeast, there is no need to replace the filtration filter and smooth filtration can be performed, which enables economical operation of the device, reducing filtration cost and effective use of space. Planned. Also, chemical cleaning and heat sterilization are possible. Furthermore, filtration and washing of the filter can be performed simultaneously.

[Brief description of drawings]

FIG. 1 is a diagram showing a schematic flow of a beer filtering device of the present invention.

FIG. 2 is a schematic vertical sectional view of a main filter used in the present invention.

FIG. 3 is a diagram showing a schematic flow of a filter unit of another aspect included in the filtration device of the present invention. F ... Filter unit C ... Washing unit P ... Pressurizing pump 10 ... Stock solution inflow pipe 15a ... First pipe 15b ... Second pipe 16a ... Third pipe 16b ... Fourth pipe 30-1 to N ... Main filter 40, 60 ... Sub-filter 41 ... Fluid introduction pipe 42 ... Drain pipe 45 ... First pipe 46 ... Second pipe 47a ... Third pipe 47b ... Fourth pipe 70 ... Buffer tank

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Masamitsu Mizuki, 4-17-1, Ikenomiya, Hirakata-shi, Osaka Prefecture, Japan Hirakata Plant, Nihon Seisen Co., Ltd. (72) Atsushi Yoshida 4-chome, Ikenomiya, Hirakata-shi, Osaka No. 1 Japan Seisen Co., Ltd. Hirakata factory

Claims (5)

[Claims] 1. A device for filtering beer, the device including a sintered filter body containing at least metal fibers, a main filter for filtering beer, and a cleaning device supplied to the main filter. A sub-filter for filtering fluid, and a buffer tank that is connected to the main filter and temporarily stores an appropriate amount of fluid for flushing to regenerate clogging of the main filter. A filter apparatus for beer, wherein a nominal filtration accuracy of a filter body containing metal fibers is more than 0.3 µm and less than 2.0 µm. 2. At least two or more main filters according to claim 1 are provided in parallel, and while the beer is filtered by at least one of the main filters, another one of the main filters is washed. The beer filtering device according to claim 1, further comprising a switching mechanism. 3. The main filter, the sub-filter, and the buffer tank, at least beer to pass the beer through the main filter, the operation of taking out the filtrate,
An operation in which the cleaning fluid is temporarily stored in the buffer tank, the clogging of the main filter is regenerated by flushing the stored fluid, and the cleaning fluid is temporarily stored in the buffer tank, and the stored fluid is stored in the buffer tank. The beer filtration device according to claim 1, wherein the beer filtration device and the main filter are connected so as to perform continuous circulating cleaning. 4. An apparatus for filtering beer, the apparatus comprising a sintered filter body containing at least metal fibers, a main filter for filtering beer, and a sintering containing at least metal fibers. And a sub-filter for filtering the cleaning fluid supplied to the main filter, and an appropriate amount of the sub-filter connected to the main filter and the sub-filter for flushing the clogging of the filters. A buffer tank for temporarily storing a fluid, and a nominal filtration accuracy of a filter body that is provided in each of the main filter and the sub-filter and contains metal fibers,
A beer filtration device having a size of more than 0.3 μm and less than 2.0 μm. 5. The main filter, the sub-filter, and the buffer tank at least let beer pass through the main filter and take out a filtrate,
An operation of temporarily storing the cleaning fluid in the buffer tank, regenerating the clogging of the main filter or the sub-filter by flushing the stored fluid, and temporarily storing the cleaning fluid in the buffer tank, and then storing the cleaning fluid. The fluid is connected between the buffer tank and the main filter so as to be continuously circulated and washed.
The described beer filtration device.