JPH09314160A - Filter for bath water purifying apparatus and method for producing the same - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent the cloudiness of bath water by removing a contaminant suchs as waste refuse or suspended particles contained in bath water. SOLUTION: Microbe 30 of either one of a symbiotic microbe group, an undernutrition microbe group, a composite symbiotic microbe group and activated sludge are added to a substance obtained by mixing a medium material 40 and a component 41 to be purified to prepare a seed material 42, that is, propagating microbe 43. Next, the medium material 40 and a carrier 27 are added to propagating microbe 43 to culture the propagating microbe 43 to fix them on the carrier 27.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a filter for a bath water purifying apparatus for passing bath water stored in a bath to remove contaminants such as dust or suspended particles contained in the bath water, and a method for producing the same. It is a thing.

[0002]

2. Description of the Related Art In a conventional bath water circulating and purifying apparatus, various filters are used to remove dirt components such as dust, suspended particles and soluble suspended substances in the bath water. For example, 1) a pre-filter that removes relatively large dust such as hair and dirt, 2) a main filter that removes suspended particles with a particle size of about 10 μm or more, 3) a soluble suspended substance is decomposed by microorganisms. Three filters are used: a microbial filter that removes and removes suspended particles by adhering them to a microbial membrane that is a microbial secretion.

A porous carrier of natural stone, ceramic balls, or activated carbon is used for a microbial filter, and a method of preliminarily fixing microorganisms and a microbial membrane on the porous carrier and a porous carrier at the time of initial use of the bath water circulation purification device are used. There are two methods of capturing and growing microorganisms in bath water and immobilizing microorganisms and microbial membranes.

In particular, when activated carbon is used as the porous carrier, the number of immobilized microorganisms is larger and the formation of a microbial membrane is better than when natural stone or ceramic balls are used. Further, the pores formed on the surface of the activated carbon remove suspended particles having a particle diameter of 0.1 μm or less by physical adsorption, and have a high purification ability.

However, the immobilization method in which the microorganisms are grown while being captured is such that the microorganisms do not grow well due to the environmental factors of the water quality used and it takes several weeks or more to immobilize the microorganisms and form the microbial membrane. There is. For this reason,
Particle size that cannot be sufficiently removed by physical adsorption of pre-filter, main filter and activated carbon because removal of soluble suspended substances due to decomposition action of microorganisms and removal of suspended particles due to adhesion of microbial membrane are not performed sufficiently. Suspended particles of 1 to 10 μm diffuse into the bath water. For this reason, the phenomenon that the bath water becomes cloudy may occur. It is considered that this cloudy substance is a colloidal dispersion of fatty acids of soap, oil components from the human body, and inorganic ions (Ca ² +, Mg ² −, Al ³ −, etc.).

Next, a specific example of a conventional circulating water purification apparatus will be described. For details, refer to the publication and the main points will be described below. FIG. 8 is a diagram showing the configuration of a conventional bath water circulation purification method and apparatus disclosed in, for example, Japanese Patent Application Laid-Open No. 4-277082.

In FIG. 8, the purification unit 1 includes a circulation pump 2,
A heater 3, a filling tank a4 and a filling tank b5 in which a carrier on which microorganisms are immobilized in advance are filled are housed. Then, the first conduit 7 is arranged between the bath 6 and the circulation pump 2, the second conduit 8 is arranged between the bath 6 and the filling tank a 4 and the filling tank b 5, and the first conduit 7 is provided. The pumped bath water 12 is returned to the bathtub 6. Carriers filled in the filling tank a4 and the filling tank b5 are ceramics, barley stone, activated carbon, etc.
Nitrite bacteria and nitrate bacteria are fixed.

Next, the operation of the circulating water purifying device will be described. The bath water 12 is pumped up by the circulation pump 2,
It is introduced into the filling tank a4 and the filling tank b5 through the first conduit 7 and is purified by the filled carrier. The purified bath water 12 is returned to the bath 6 through the second conduit 8.
At this time, the bath water 12 is heated by the heater 3 arranged below the circulation pump 2.

The conventional bath water circulation purifying apparatus disclosed in Japanese Patent Laid-Open No. 4-277083 is the same as that in Japanese Patent Laid-Open No. 4-277082 although the illustration is omitted. The carrier filled in the filling tank is activated sludge to which a photocrosslinking resin such as polyvinyl alcohol or a urethane prepolymer is fixed.

FIG. 9 shows, for example, Japanese Unexamined Patent Publication No. 7-29949.
It is a figure which shows the structure of the conventional circulation purification apparatus of bath water assumed from the 6th publication. 9, the same symbols as those in FIG. 8 indicate the same or corresponding portions. The purification unit 1 accommodates a bobbin filter 9, a circulation pump 2, a purification module 10 in which a porous mineral and a carrier on which microorganisms have been fixed are filled, and a sterilizer 11. The first conduit 7 is arranged between the bath 6 and the bobbin filter 9, and the second conduit 8 is arranged between the bath 6 and the sterilizer 11. The bath water 12 pumped through the first conduit 7 is passed through the second conduit 8 to the bath 6
Return to The carrier filled in the purification module 10 is a pyridinium-type resin film on which bacteria having nitrifying activity are immobilized.

Next, the operation of the circulating water purifying device will be described. The bath water 12 is pumped up by the circulation pump 2,
It is made to flow into the purification module 10 from the bobbin filter 9 through the first conduit 7. Then, the bath water 12 is filtered by the bobbin filter 9 and further purified by the mineral and the carrier filled in the purification module 10. Then, after the bath water 12 is sterilized by the sterilizer 11, it is returned to the bathtub 6 through the second conduit 8.

[0012]

DISCLOSURE OF INVENTION Problems to be Solved by the Invention A conventional bath water circulation purification device is devised so as to purify the bath water by using a carrier on which microorganisms are immobilized in advance and prevent cloudiness of the bath water as described above. Was. However, repeated evaluations of the purification of bath water resulted in the occurrence of white turbidity in a few cases. This is because a sufficient number of microorganisms were immobilized on the carrier, but the microbial membrane adhering to the suspended particles was not sufficiently formed. Therefore, there is a problem that the suspended particles gradually diffuse into the bath water and the bath water becomes cloudy.

The present invention has been made in order to solve such problems, and a filter for a bath water purifying device capable of preventing clouding of bath water and guaranteeing sufficient purifying ability from the beginning of use, and It is intended to provide a manufacturing method thereof.

[0014]

A bath water purifying apparatus filter according to the present invention is a bath water purifying apparatus filter for passing bath water stored in a bath to remove dirt components contained in the bath water. , A microorganism to be cultured with a porous carrier and a medium material composed of yeast extract, polypeptone, glucose, etc. immobilized on the porous carrier and a component to be purified composed of proteose peptone, sodium chloride, potassium dihydrogen phosphate, etc. It is equipped with and.

The microorganism is subcultured with a medium material and a component to be purified.

The porous carrier is selected from activated carbon, ceramic balls and natural stone.

Further, the microorganism is selected from any one of a symbiotic microbial group, an undernutritive microbial group, a complex symbiotic microbial group, and activated sludge.

The culture temperature for culturing the microorganism and the immobilization temperature for immobilizing the microorganism on the porous carrier are set in the range of 35 ° C to 45 ° C, respectively.

The method for producing a filter for a bath water purifying apparatus according to the present invention comprises a porous carrier, a medium material comprising yeast extract, polypeptone, glucose and the like, and proteose peptone, sodium chloride, dihydrogen phosphate. This is a step of immobilizing microorganisms cultured with a component to be purified such as potassium.

[0020] Further, it is a step of subculturing the microorganism with the medium material and the component to be purified.

Further, the step of selecting the porous carrier from activated carbon, ceramic balls or natural stone is adopted.

Further, the step of selecting the microorganism as any one of a symbiotic microbial group, an undernutritive microbial group, a complex symbiotic microbial group, and activated sludge.

Further, the culture temperature for culturing the microorganisms and the immobilization temperature for immobilizing the microorganisms on the porous carrier are set in the range of 35 ° C. to 45 ° C., respectively.

[0024]

BEST MODE FOR CARRYING OUT THE INVENTION

Embodiment 1. FIG. 1 is a configuration diagram of a circulation purification device to which a filter for a bath water purification device according to the present invention is attached. In FIG. 1, a purification unit 13 is a septic tank 1 containing a microbial filter 16 and a main filter 17.
5, circulation pump 2 for pumping bath water 12, heater 3 for heating bath water 12, sterilizer 11 for sterilizing bath water 12, flow sensor 18 for detecting the circulating amount of bath water 12, bath water 12
A three-way valve a20 and a three-way valve b21 that switch the circulation flow paths for purification and cleaning, 14 is a pre-filter, and 22 is a third conduit. The same reference numerals as those used in the related art indicate the same or corresponding portions.

In the circulation purifying apparatus constructed as described above, when the circulation pump 2 starts to operate, the bath water 12 stored in the bath 6 passes through the pre-filter 14 so that hair or dirt is relatively removed. Large dust is removed. Then, the bath water 12 that has passed through the pre-filter 14
Is sent to the septic tank 15 via the first conduit 7. In the septic tank 15, the soluble suspended substances and suspended particles contained in the bath water 12 are removed. Next, the bath water 12 that has been completely purified by passing through the septic tank 15 is heated and kept warm by the heater 3, and then sterilized by the sterilizer 11 and returned to the bath 6.

A schematic sectional view of the septic tank 15 is shown in FIG. In FIG. 2, the bath water 12 passes through the flow path 25 formed between the first tank 23 and the second tank 24, and the microorganisms 30
The carrier 27 on which is immobilized passes through the collected microbial filter 16. Then, the bath water 12 passes through the main filter 17 through the support plate 26 having holes.

Further, the microbial filter 1 according to the first embodiment
The process in which the bath water 12 is purified by 6 will be described with reference to the schematic sectional view of the microbial filter 16 shown in FIG. The microbial filter 16 is a carrier 27 such as activated carbon 2
Microorganisms 30 are immobilized on the surface of the activated carbon 28, and a microbial film 31 is formed on the surface of the activated carbon 28. Suspended particles 33 having a particle size of 10 μm or more, which are dirt components contained in the bath water 12,
Suspended particles 34 having a particle size of 0.1 to 10 μm, particle size of 0.1 μm
The following suspended particles 35 and soluble suspended substances 36 progress to the microbial filter 16. And a particle size of 0.1 μm
The following suspended particles 35 are physically adsorbed by the holes 29 formed on the surface of the activated carbon 28, and the soluble suspended substance 36 is decomposed by the microorganism 30. Furthermore, particle size 0.1
The 10 μm suspended particles 34 are removed by the adhesive action of the microbial film 31. Here, the microorganisms 30 self-propagate using the soluble suspended substance 36 as a nutrient source, and the number of the microorganisms 30 is quantitatively maintained. Suspended particles 33 having a particle size of 10 μm or more that cannot be removed by the microorganism filter 16 proceed to the main filter 17 and are removed. In addition, activated carbon 28
Suspended particles 35 having a particle diameter of 0.1 μm or less deposited in the holes 29 of
And the suspended particles 34 having a particle size of 0.1 to 10 μm adhered to the microbial membrane 31 are periodically and automatically washed by the cleaning mechanism incorporated in the circulation purification device shown in FIG. 1 and discharged to the outside of the septic tank 15. To do.

Examples of the microorganisms immobilized on the activated carbon 28 include symbiotic microbial groups, undernutritive microbial groups, complex symbiotic microbial groups, and activated sludge. It is not necessary to immobilize the microorganisms 30 on the activated carbon 28 in advance in the entire volume. For example, if the microorganisms 30 are immobilized in advance in a part (1/4 to 1/2) of the entire volume, the microorganisms 30 will proliferate. The entire capacity of the activated carbon 28 is fixed and the purifying ability is exerted.
FIG. 4 shows, for example, the total volume of activated carbon 28 or 1 / of the total volume.
2 shows the purification performance of the bath water 12 over time when 2, 1/4 is immobilized in advance with the symbiotic microorganism group contained in the bath water 12. The level value was 1 when the purification performance was sufficiently high and stable. In FIG. 4, activated carbon 28
When the total volume of the product was immobilized in advance by microorganisms (A in Fig. 4), 1/2 of the total volume was immobilized 2 days after the start of use (Fig. 4).
After 6 days, the level value of the purification performance is high and stable after 6 days. Furthermore, when 1/4 of the total capacity is fixed (C in FIG. 4), the level value is high and stable after 9 days.

Further, examples of the medium material for culturing the microorganism include peptone, meat extract, yeast extract and the like. The yeast extract is a beer yeast or other yeast that is leached at low temperature and dried at low temperature, and is rich in amino acids, vitamins, and inorganic salts.

A method for producing the microbial filter 16 will be described with reference to the process chart shown in FIG. In FIG. 5, seeds are prepared by adding microorganisms 30 of any one of symbiotic microorganisms group, undernutritive microorganisms group, complex symbiotic microorganisms group, and activated sludge to a substance obtained by mixing a medium material 40 and a component 41 to be purified. A material 42, that is, a growth microorganism 43 is prepared. This completes the seed preculture step. Next, the medium material 40 and the carrier 27 are put into the proliferating microorganisms 43 adjusted in the seed pre-culturing step, and the proliferating microorganisms 43 are immobilized on the carrier 27 while being cultured. As a result, the immobilization carrier 44 is produced and the immobilization culture step is completed. The microbial filter 16 is produced by these steps. The step temperature of the seed pre-culture step and the immobilized culture step is set in the range of 35 ° C to 45 ° C.

Further, specific examples of the medium material 40 and the component to be purified 41 used in the seed preculture step and the fixed culture step will be described below. -Medium material: yeast extract 0-2 g, polypeptone 0-10 g, glucose 0-5 per 1000 cc of purified water
g, calcium chloride 0.05 g, magnesium chloride 0.
1 g, trace element solution 10 cc, and vitamin solution 10 cc are mixed. -Purified component (artificial sewage): BOD (biological oxygen demand) concentration 5 to 10 ppm COD (chemical oxygen demand) concentration 5 to 10 ppm, polypeptone 0.75 per 1000 cc of purified water
g, yeast extract 0.75 g, proteose peptone 0.7
5g, glucose 0.5g, sodium chloride 0.05
g, calcium chloride 0.01 g, magnesium chloride 0.
01 g, dipotassium hydrogen phosphate 0.075 g, and potassium dihydrogen phosphate 0.075 g are mixed. The microbial filter 16 obtained by the above-described manufacturing process removes the dirt components contained in the bath water 12 when it is attached to the circulation purification device, so that the bath water 12 is purified. Therefore, the cloudiness of the bath water 12 can be prevented.

Embodiment 2 FIG. FIG. 6 is a manufacturing process diagram for explaining another embodiment of the filter for the bath water purifying apparatus according to the present invention. In FIG. 6, a microorganism obtained by mixing the medium material 40 and the component to be purified 41 with any one of a symbiotic microbial group, an undernutritive microbial group, a complex symbiotic microbial group, and activated sludge is added. Of the seed material 45, that is, the first growth microorganisms 46 are prepared. This completes the seed preculture (N = 1) step. Next, the medium material 40 and the component 41 to be purified are put into the first proliferating microorganism 46 to prepare the second seed material 47. This completes the seed pre-culture (N = 2) step. Then, such a pre-culture step is repeated, for example, 10 times (this is repeated 10 times).
Called the subculture of times). As a result, the tenth seed material 49, that is, the tenth proliferating microorganism 50 is adjusted. The medium material 40 and the carrier 27 are added to the tenth growth microorganism 50.
Are added to fix the carrier 10 to the carrier 27 while culturing the tenth proliferating microorganism 50. Then, the immobilization carrier 44 is produced, and the immobilization culture step is completed. The microbial filter 16 is produced by these steps. In addition, the process temperature of the pre-culture process of the seed and the immobilized culture process was set to 35 ° C.
Set in the range of ~ 45 ° C. Since the culture medium material 40 and the component to be purified 41 are the same as those in the first embodiment, the description thereof is omitted here.

FIG. 7 shows the medium material 40 and the culture medium 40 of the tenth proliferating microorganism 50 when the subculture was performed 10 times using the symbiotic microorganism and the microorganism 30 when the subculture was not performed at all. 4 shows the growth characteristics of the purification component 41 in the culture process. In FIG. 7, microorganism 5 which was subcultured 10 times
In 0 (A in FIG. 7), the number of microorganisms 50 increased rapidly in about 2 days, and has been stable thereafter. This is because the activity is high, that is, the nutrient source is efficiently absorbed. On the other hand, the number of the microorganisms 30 that have not been subcultured (B in FIG. 7) is gradually increasing in about 4 days, but the number is relatively small and stable. this is,
This is because the activity is low, that is, the nutrient source is absorbed inefficiently. As described above, the microbial filter 16 obtained in the subculture production step is attached to the circulation purification device because the number of the tenth proliferating microorganisms 50 having the ability to purify the bath water 12 rapidly increases. Since the dirt components contained in the bath water 12 when removed are completely removed, the bath water is sufficiently purified. Therefore, the turbidity of the bath water 12 can be completely prevented.

[0034]

Since the present invention is configured as described above, it has the following effects.

A filter for a bath water purifying apparatus according to the present invention is a bath water purifying apparatus filter for passing a bath water stored in a bath to remove contaminants contained in the bath water. A yeast extract immobilized on a porous carrier, a medium material composed of polypeptone, glucose and the like and a microorganism cultured with a component to be purified composed of proteose peptone, sodium chloride, potassium dihydrogen phosphate and the like were provided. Therefore, when the filter for the purifying device is attached to the purifying device, the contaminants contained in the bath water are removed to purify the bath water. Therefore, it is possible to obtain a filter for a bath water purifying apparatus that can be expected to prevent clouding of the bath water.

Further, since the microorganisms were subcultured with the medium material and the component to be purified, when the filter for the purifying device was attached to the purifying device, the contaminants contained in the bath water were completely removed, The bath water is thoroughly purified. Therefore,
A filter for a bath water purifier that can be expected to completely prevent clouding of bath water is obtained.

Since the porous carrier is selected from activated carbon, ceramic balls, and natural stone, the contaminants contained in the bath water are removed to purify the bath water. Therefore, it is possible to obtain a filter for a bath water purifying apparatus that can be expected to prevent clouding of the bath water.

Further, since the microorganisms are selected to be any of the symbiotic microorganisms group, the poor nutritional microorganisms group, the complex symbiotic microorganisms group, and the activated sludge, the contaminants contained in the bath water are removed, The bath water is purified. Therefore, it is possible to obtain a filter for a bath water purifying apparatus that can be expected to prevent clouding of the bath water.

Further, since the culture temperature for culturing the microorganism and the immobilization temperature for immobilizing the microorganism on the porous carrier are set in the range of 35 ° C. to 45 ° C., respectively, they are included in the bath water. Bath water is purified by removing dirt components. Therefore, it is possible to obtain a filter for a bath water purifying apparatus that can be expected to prevent clouding of the bath water.

The method for producing a filter for a bath water purifying apparatus according to the present invention is a medium material comprising yeast extract, polypeptone, glucose and the like in a porous carrier, and proteose peptone, sodium chloride, potassium dihydrogen phosphate and the like. The process for immobilizing microorganisms to be cultured with the component to be purified consists of purifying the bath water by removing the contaminants contained in the bath water when the filter for the purification device is attached to the purification device. To be done. Therefore, it is possible to obtain a filter for a bath water purifying apparatus that can be expected to prevent clouding of the bath water.

Further, since the step of subculturing the microorganisms with the medium material and the component to be purified is carried out, the contaminant components contained in the bath water are completely removed when the filter for the purification device is attached to the purification device. Then, the bath water is sufficiently purified.
Therefore, it is possible to obtain a filter for a bath water purifying apparatus that can be expected to completely prevent clouding of the bath water.

Since the porous carrier is selected from activated carbon, ceramic balls and natural stone, the contaminants contained in the bath water are removed to purify the bath water. Therefore, it is possible to obtain a filter for a bath water purifying apparatus that can be expected to prevent clouding of the bath water.

Further, since the step of selecting the microorganism as any one of the symbiotic microorganism group, the low nutrient microorganism group, the complex symbiotic microorganism group, and the activated sludge, the contaminant components contained in the bath water are removed, The bath water is purified. Therefore, it is possible to obtain a filter for a bath water purifying apparatus that can be expected to prevent clouding of the bath water.

Further, since the culturing temperature for culturing the microorganism and the immobilizing temperature for immobilizing the microorganism on the porous carrier are set in the range of 35 ° C. to 45 ° C. respectively, they are contained in the bath water. Bath water is purified by removing dirt components. Therefore, it is possible to obtain a filter for a bath water purifying apparatus that can be expected to prevent clouding of the bath water.

[Brief description of drawings]

FIG. 1 is a configuration diagram showing a circulation purification device to which a bath water purification device filter according to the present invention is attached.

FIG. 2 is a schematic sectional view of a septic tank in which a filter for a bath water purifying device according to the present invention is housed.

FIG. 3 is a partially enlarged view of the microbial filter according to the first embodiment.

FIG. 4 is an example of the purification characteristics of the first embodiment.

FIG. 5 is an example of a manufacturing process of the microbial filter according to the first embodiment.

FIG. 6 is an example of a manufacturing process of the microbial filter according to the second embodiment.

FIG. 7 shows an example of growth characteristics of the microbial filter according to the second embodiment.

FIG. 8 is a configuration diagram showing a conventional circulating water purification apparatus for bath water.

FIG. 9 is a configuration diagram showing a conventional circulation purification device for bath water.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 purification part, 2 circulation pump, 3 heater, 4 filling tank a, 5 filling tank b, 6 bath, 7 1st conduit, 8 2nd
Conduit, 9 spool filter, 10 purification module,
11 sterilizer, 12 bath water, 13 purification unit, 1
4 pre-filter, 15 septic tank, 16 microbial filter, 17 main filter, 18 flow sensor, 19 thermistor, 20 three-way valve a, 21 three-way valve b 22 third conduit, 23 first tank, 24 second tank, 25 Flow path, 26 support plate, 27 carrier, 28 activated carbon, 29 holes, 30 microorganisms, 31 microbial membrane, 33
Suspended particles of 10 μm or more, 34 0.1-10 μm suspended particles, 35 0.1 μm or less suspended particles, 36 soluble suspended substance, 40 medium material, 41 components to be purified, 42
Seed material, 43 growth microorganisms, 44 immobilization carrier,
45 first seed material, 46 first growing microorganism, 4
7 Second seed material, 48 9th growth microorganism, 49
Tenth seed material, 50 Tenth growing microorganism.

 ────────────────────────────────────────────────── ─── Continued on front page (72) Inventor Kenji Nomura 2-3-2 Marunouchi, Chiyoda-ku, Tokyo Mitsubishi Electric Corporation

Claims (10)

[Claims] 1. A filter for a bath water purifying apparatus, which allows bath water stored in a bath to pass through to remove contaminants contained in the bath water, and a porous carrier and yeast extract immobilized on the porous carrier. , Medium material consisting of polypeptone, glucose, etc. and proteose peptone, sodium chloride,
A filter for a bath water purification device, comprising a microorganism cultured with a component to be purified such as potassium dihydrogen phosphate. 2. The filter for a bath water purifying apparatus according to claim 1, wherein the microorganism is subcultured with the medium material and the component to be purified. 3. The filter for a bath water purifying apparatus according to claim 1 or 2, wherein the porous carrier is selected from activated carbon, ceramic balls, and natural stone. 4. The purification of bath water according to claim 1 or 2, wherein the microorganism is selected from any of a symbiotic microbial group, an undernutritive microbial group, a complex symbiotic microbial group, and activated sludge. Device filter. 5. A culture temperature for culturing the microorganism and an immobilization temperature for immobilizing the microorganism on the porous carrier,
The bath water purifying apparatus filter according to claim 1 or 2, wherein the temperature is set in the range of 35 ° C to 45 ° C, respectively. 6. A method for producing a filter for a bath water purifying apparatus, which allows bath water stored in a bath to pass therethrough to remove contaminants contained in the bath water, wherein a yeast extract, polypeptone, glucose is used as a porous carrier. A method for producing a filter for a bath water purifying apparatus, which comprises immobilizing microorganisms to be cultured with a medium material consisting of, for example, and components to be purified consisting of proteose peptone, sodium chloride, potassium dihydrogen phosphate and the like. 7. The method for producing a filter for a bath water purifying apparatus according to claim 6, wherein the microorganism is subcultured with the medium material and the component to be purified. 8. The method for producing a filter for a bath water purifying apparatus according to claim 6 or 7, wherein the porous carrier is selected from activated carbon, ceramic balls, and natural stone. 9. The purification of bath water according to claim 6 or 7, wherein the microorganism is selected from any of a symbiotic microbial group, an undernutritive microbial group, a complex symbiotic microbial group, and activated sludge. Method for manufacturing device filter. 10. The culture temperature for culturing the microorganism and the immobilization temperature for immobilizing the microorganism on the porous carrier are set in the range of 35 ° C. to 45 ° C., respectively. A method for manufacturing a filter for a bath water purifying apparatus according to claim 7.