JPH07251192A - Biological contact material unit for foul and waste liquid treatment - Google Patents

Abstract

PURPOSE: To obtain a contact material unit for microorganisms usable in a fluidized bed system by inserting ordinary microbial contact materials into a protective casing body of a network structure in such a manner that the water streams and air bubbles in the internal spaces are flowable with the outside.

CONSTITUTION: The surface of the protective casing body 1a of the microbial contact materia unit for a fluidized bed system is formed of the network structure and this casing body is constituted by attachably and detachably coupling two kind of upper and lower hemispherical cases 2 internally formed with the specified spaces to each other. Horizontal ribs 4 and perpendicular ribs 5 are intersected with circular coupling ribs 3 of the part where the surface of the upper hemispherical case 2 couples to the lower hemispherical case with each other to a dome shape, by which the integral network structure is formed. Assembly pins 6 and assembly pin housing parts 7 are alternately formed at the circular coupling ribs 3 to allow the assembly with another hemispherical cases. This microbial contact material unit is contained with the microbial contact materials within the protective casing body 1a allowing the flow of the water streams and the air bubbles with the outside and is securely supported and protected by lock pins.

COPYRIGHT: (C)1995,JPO

Description

Detailed Description of the Invention

[0001]

[Industrial field of use] The present invention is directed to the fouling by the contact oxidation method.
As a microbial packing unit (UNIT) to be filled in the aeration tank of a wastewater treatment facility, especially a scrubbing microbial contact material that has been used only in the fixed bed system, which has excellent microbial body capacity and is difficult to construct. Since it becomes a unit, it can be used in a fluidized bed system, and the specific gravity can be easily adjusted with various specific gravity so that it can be distributed uniformly along the depth without concentrating on the water surface or the bottom side. The present invention relates to a microbial contact material unit for a fluidized bed system.

[0002]

2. Description of the Related Art The catalytic oxidation method in the treatment of fouling / wastewater in the field of application of the present invention is one of biological fouling / wastewater treatment methods. It is a construction method that installs it in the aeration tank of the treatment facility and treats pollutants and wastewater by decomposing contaminants by microorganisms.The amount of sludge generated is smaller than other construction methods such as the activated sludge construction method, and sludge transportation is unnecessary. It is economical in terms of facility cost and power cost, the site area is small, and it is possible to respond flexibly depending on the amount of processed materials, and its many advantages are increasing its usage.

In the treatment of fouling / wastewater by the above-mentioned catalytic oxidation method, microorganisms are attached to the surface of the fouling / wastewater, and direct fouling
The microbial contact material in charge of the wastewater treatment function is the most important part, and the above-mentioned construction methods are roughly classified into a fixed bed method and a fluidized bed method depending on the method of installing the microbial contact material in the aeration tank of the sewage / wastewater treatment facility. Among them, the fixed bed method has an advantage of increasing the capacity of treating sewage and wastewater, since it can appropriately place the microbial contact material in the aeration tank, but it has the disadvantages of high facility cost and long construction period. However, since a certain installation space is occupied in the aeration tank, there is a problem that it interferes with repair and dismantling of the aeration tank, and additional expansion is difficult when the processing capacity is insufficient. On the other hand, the fluidized bed method can easily put the microbial contact material in the aeration tank, so the construction is very easy. On the other hand, there is still no microbial contact material suitable for use in the fluidized bed system, and the microbial contact material should be evenly and stably arranged in the aeration tank, especially without being concentrated on the water surface or the bottom side. Since it is more difficult to uniformly and stably disperse along this line, there is a problem that the treatment capacity of polluted water and wastewater is reduced.

On the other hand, the microbial contact material must have excellent durability in terms of its essential function, that is, the ability of the microorganism to be in the body, that is, the adhesiveness to the microorganism, the growth property and the adhesion property.
In addition, an appropriate shape and structure are required depending on the installation method, but for this purpose, the material and shape must be properly selected. The advantages and disadvantages of the conventional microbial contact materials are described below.

First, a so-called "boiler-shaped microbial contact material"
Whereas, the material is made of hydrophilic synthetic resin, but its fine structure is scrubber-like, and it can be used in various shapes as needed, and since the material is hydrophilic and has a large specific surface area, adhesion of microorganisms is possible. Although it has the advantage that it is easy to grow and grows well, on the other hand, its shape and structure are not suitable for installing it in a fluidized bed in an aeration tank, so the problem is that it must be used only with a fixed bed, which has the above-mentioned disadvantages. is there.

[0006] In addition, a so-called "circular microbial contact material" whose material is hydrophilic synthetic resin and whose fine structure is composed of a large number of synthetic resin thread rings (21) as shown in Fig. 10 (a). As shown in (15) and Fig. 10 (b), there are so-called "cilia-like microbial contact materials" (16) consisting of a large number of synthetic resin yarn cilia (22), all of which are long ropes. As for the shape, it has a structure in which a corrosion-resistant metal core (20) is inserted in the center, if necessary, and installation in the required shape is easy, and its advantages and disadvantages are the same as the above-mentioned scrubbing shape.

On the other hand, as compared with the microbial contact material whose use is limited to the fixed bed system as described above, the microbial contact material used in the fluidized bed system is a synthetic resin injection product having a specific surface area as large as possible. However, since its surface is slippery and its specific surface area is smaller than the above-mentioned scrubbing shape, ring shape and cilia shape, adhesion and growth of microorganisms are reduced and it flows in the aeration tank. Therefore, there is a problem that they collide with each other and break, or microorganisms are detached, and that there is a problem that it is difficult to contact dirt and wastewater because it all floats on the water surface of the aeration tank or is settled and it is difficult to contact the dirt and wastewater. There is a problem that it cannot be used for the original purpose of processing.

Therefore, in spite of the advantages of the fluidized bed method described above, there is no microbial contact material suitable for this, so the fixed bed method has been mainly adopted in the recent treatment of sewage and wastewater by the catalytic oxidation method. It is the actual situation.

Since the present invention has good microbial body capacity, it is excellent in the function of decomposing pollutants in pollutants and wastewater, and as described above, it has a number of advantages in the fluidized bed catalytic oxidation method. Is a scrubbing brush, which is difficult to use
In order to make the annular or ciliated microbial contact material usable in the fluidized bed system, by combining it with a suitable means, a so-called "microbial contact material unit" is provided which can be used in the fluidized bed system. In particular, it has its first purpose.

Further, the present invention solves the problems of the conventional fluidized bed system, that is, that the microbial contact material is uniformly and stably distributed in the aeration tank, and in particular, it is settled entirely at the bottom of the aeration tank. To ensure smooth contact between the microbial contact material unit and the dirt / wastewater by distributing it evenly and stably along the depth without floating on the water surface, a specific gravity adjuster is used for the microbial contact material used in the fluidized bed system or its unit. It is a second object of the present invention to provide a microbial contact material unit whose specific gravity can be adjusted in various ways by combining them.

[0011]

In order to achieve the first object of the present invention as described above, the microbial contact material unit has an internal space having a net-like structure capable of flowing with the outside and water flow and bubbles. This is a structure in which a normal microbial contact material is inserted inside the protective casing body.

As the above-mentioned microbial contact material, the above-mentioned brush-shaped, ring-shaped or ciliated microbial contact material is used.

In the microbial contact material unit for achieving the second object of the present invention as described above, a specific gravity adjusting body capable of variously adjusting the overall specific gravity of the microbial contact material unit for a fluidized bed system is coupled to the unit. It is a structured structure.

As the microbial contact material unit for the fluidized bed system described above, it is possible to use a conventional synthetic resin injection product for the fluidized bed system, but it is preferable or the microbial contact according to the first object of the present invention. A lumber unit is used.

[0015]

The above-mentioned microbial contact material unit according to the present invention is built in and installed in a conventional fixed bed type scrubbing, annular or ciliated microbial contact material in a protective casing body having a net-like structure. As a result, the water flow and air bubbles have a structure that allows mutual flow with the outside and protects the internal microbial contact material against external impact.
Since it can be installed by simply putting it in the aeration tank, it can be used in a fluidized bed system.Because the microbial contact material unit can be made with various specific gravities by the specific gravity adjuster, units with various specific gravities can be used in the aeration tank. When placed in, the layers are arranged differently depending on the specific gravity, so that the units are not concentrated on one of the water surface and the bottom side, but are uniformly distributed at each depth.

[0016]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will now be described in more detail with reference to the accompanying drawings.

FIGS. 1 to 6 show a microbial contact material unit for fluidized bed system in which the above-mentioned scrubbing microbial contact material is inserted into a protective casing body according to the present invention. The description will be given in order of the drawings.

FIG. 1 (a) is a perspective view showing only the protective casing body (1a) of the fluid bed type microbial contact material unit according to the first embodiment of the present invention, the surface of which has a mesh structure. 2 shows a structure of a spherical case in which two types of upper and lower hemispherical cases (2) having a fixed space formed therein are detachably coupled.

FIG. 1 (b) is a plan view of FIG. 1 (a), in which the surface of the upper hemispherical case (2) is horizontally attached to the circular connecting rib (3) at the part where the surface is connected to the lower hemispherical case. The ribs (4) and the vertical ribs (5) have an integral mesh structure so that they can intersect each other in a dome shape, and the circular connecting ribs (3) have an assembly pin (6) and an assembly pin. The storage openings (7) are alternately formed so that they can be assembled with the other hemispherical case.

FIG. 2 (a) is a sectional view taken along the line AA of FIG. 1 (b), wherein the inside of the hemispherical case (2) has the horizontal ribs (4) and the vertical ribs (5). Two kinds of fixing pins (8a) (8b) for fixing the brush-shaped microbial contact material at a constant gap inside each are formed in the circumferential shape of the horizontal rib (4), respectively. 6) and the assembly pin storage port (7) are configured to be fitted to each other.

As shown in FIGS. 1 (a), 1 (b) and 2 (a), FIG. 2 (b) shows that the brush-like microbial contact material (9a) is installed inside the protective casing body (1a). As a vertical sectional view of the microbial contact material unit, the hemispherical case (2) has an assembly pin (6) and an assembly pin storage port (7).
And the microbial contact material (9a) is plate-shaped, and the upper and lower fixing pins (8
It is in a state of being firmly fixed by a) (8b).

In the microbial contact material unit according to the first embodiment of the present invention as described above, the microbial contact material (9) is provided inside the protective casing body (1a) in which water flow and bubbles can flow from the outside.
a) is built in and is firmly supported and protected by the fixing pins (8a) and (8b) described above, so that even if the unit collides due to flowing in the aeration tank, the built-in brush-like microbial contact material (9a ) Is damaged or its microbial membrane is not detached, it is possible to decompose the pollutants in the aeration tank semipermanently.

Further, since the protective casing body (1a) is also made of a hydrophilic synthetic resin and has a considerably large surface area, microorganisms adhering to and proliferating on the surface are also considerable, and the whole body of the microorganism is a pale body. Has the effect of significantly increasing ability.

FIG. 3 is a cross-sectional view of a microbial contact material unit for fluidized bed system according to a second embodiment of the present invention. The protective casing body (1b) has an outer case (10a) and an inner case (11a) having a mesh structure. Is composed of a double case integrally connected by a connecting rib (12), and a spherical brush-like microbial contact material (9b) is filled in the inner case (11a). There is. Here, the inner case (11a) directly maintains and fixes the brush-like microbial contact material (9b) in a certain form to prevent the detachment, and the outer case (10a) is an aeration tank. It functions to better protect the contained microbial contact material (9b) even if the units flow and collide with each other. On the other hand, since the inner and outer cases (11a) and (10a) are connected by the connecting ribs (12) with a fixed space, even if a large number of units are adjacent to each other or stacked, water flow or The bubbles are well flowed.

FIG. 4 is a sectional view of a microbial contact material unit for a fluidized bed system according to a third embodiment of the present invention. As a modification of the second embodiment, the outer case of the inner case (11b) has the above-mentioned structure. As a structure in which a large number of outward pins (13) are formed instead of the outer case (10a) as in the second embodiment, and the brush-shaped microbial contact material (9b) is built in the inner case (11b). The outward pin (13) has the same function as the outer case (10a) in the second embodiment.

FIG. 5 is a sectional view of a microbial contact material unit for a fluidized bed system according to a fourth embodiment of the present invention, which is also a modification of the second embodiment described above, and is an outer case contrary to the third embodiment. A large number of inward pins (14) are formed on the inner surface of (10b) instead of the same inner case (11a) as in the second embodiment, and the inner space surrounded by the ends of the inward pins (14) is formed. As a structure in which the brush-shaped microbial contact material (9b) is supported and built in by the same built-in pin, the built-in pin (14) has the same function as the inner case (11a) in the second embodiment.

FIG. 6 is a sectional view of a microbial contact material unit for fluidized bed system according to a fifth embodiment of the present invention, which has the same protective casing body (1d) as compared with the fourth embodiment. The morphology of the microbial contact material (9c) is merely changed from a spherical shape to a matte shape, indicating that the microbial contact material (9c) is firmly supported by the inward pin (14). Here, the microbial contact material (9
c) consists of a matte shape instead of a spherical shape,
In the spherical shape, the central part is inefficient for the growth of microorganisms, but the microbial contact material (9c) has the effect of uniformly growing the microorganisms and increasing the diatom body ability of the microorganisms.

On the other hand, in the microbial contact material units according to the second to fifth embodiments, as in the first embodiment, the drawing is schematic, but two types of hemispherical cases can be attached and detached. The structure of the first embodiment is almost the same as that of the first embodiment in terms of its effect.

7 to 9, as described above, the ring-shaped (15) or ciliated microbial contact material (16) of FIG. 10 has a protective casing body (1e) according to a different embodiment of the present invention.
As a perspective view of the fluidized bed microbial contact material unit installed in (1f), it corresponds to the sixth to eighth embodiments of the present invention in order.

In the sixth embodiment of the present invention shown in FIG. 7, a large number of circular frames (17) are integrally connected by a large number of vertical loads (18), while inside the same vertical loads (18). A ring-shaped microbial contact material is applied to the inside of a cylindrical frame-shaped protective casing body (1e) in which a ring is attached at a constant gap or a groove is dug to form a hook body (19). (15) and the above-mentioned hanging body (19) show a structure in which a large number of circles are installed. On the other hand, the ring-shaped microbial contact material (15) may be spirally installed integrally.

The seventh embodiment of the present invention shown in FIG. 8 is almost the same as the sixth embodiment, except that the hooking body (19) is simply formed on the outside of the cylinder so that the microbial contact material (15) is also formed. Depending on the structure installed outwards, the ring-shaped or ciliated microbial contact material (15) (16) has a corrosion-resistant metal core (2) at its center.
0) is inserted, the morphological stability is superior to the scrubbing microbial contact material, so it can withstand external impact even if it is installed outward, showing that there is no special problem. There is.

The eighth embodiment of the present invention shown in FIG. 9 is different from the sixth embodiment in that instead of the cylindrical frame (1e), a spherical casing has a protective casing body (1f) which has the above-mentioned ring-shaped microorganism on its inner side. It shows a structure in which the contact material (15) is installed spirally by the hooking body (19). Here,
Since the protective casing body (1f) is composed of a spherical frame, the fluidity of the unit in the aeration tank is superior to that of the cylindrical frame.

On the other hand, the microbial contact material unit for achieving the second object of the present invention, that is, the microbial contact material unit capable of adjusting the specific gravity is a conventional microbial contact material for fluidized bed system composed of a synthetic resin injection product. The specific gravity adjusting body is made simple by connecting the specific gravity adjusting body to the material or the microbial contact material unit according to the first object of the present invention. The specific gravity adjusting body is composed of the specific gravity adjusting body and its installation port.

FIG. 10 shows, as one of the concrete embodiments based on the above construction, that the specific gravity adjusting body (23) is simply inserted into the microbial contact material unit according to the first embodiment of the present invention. Which in the microbial contact material unit according to the first embodiment above,
Of the two types of fixing pins (8a) (8b) consisting of two types for fixing the brush-shaped microbial contact material, one fixing pin (8b) inside is originally cylindrical Therefore, it has a function of fixing the microbial contact material and a function of the specific gravity adjusting object installation port. On the other hand, in the microbial contact material unit as in the second to eighth embodiments, the structure is formed so as to separately form a space into which the specific gravity adjusting object (23) can be inserted, that is, a specific gravity adjusting object installation port. It must be transformed.

The specific gravity adjusting object (23) is a stone,
A number of objects with different specific gravities such as cement mortar structures, plastic injection products, polystyrene pulls, hollow plastic balls, etc. can be used, and it is preferable that the shape is cylindrical or spherical, and the specific gravity of the unit also changes depending on the specific gravity of the inserted object Is.

When the microbial contact material unit capable of adjusting the specific gravity as described above is charged into the aeration tank, the microbial contact material unit is previously placed in the aeration tank,
After calculating the specific gravity and quantity of the units arranged in the middle, lower, etc. positions, the specific gravity adjusting objects are appropriately selected so as to meet the specific gravities of the units. Throw in. In this way, the units put into the aeration tank are not concentrated on one side such as the bottom or the water surface, but the units and the like are evenly distributed over the entire upper and lower parts of the aeration tank to improve the ability of decomposing pollutants in pollutants and wastewater.

On the other hand, the microbial contact material unit of the present invention can be manufactured by a fixed bed method, and FIG. 12 shows a concrete embodiment. That is, the fixed floor support frame (2
After the microbial contact material unit (25) of the present invention is laminated in the interior of 4), it is easily installed by blocking each side of the frame with an iron net or a net (26). Such a fixed bed system can be installed much easier than the conventional fixed bed system, and has a merit that the units can be more stably and uniformly distributed in the aeration tank as compared with the fluidized bed system. Also,
If such a fixed bed is manufactured in the factory in the form of a cage,
It can be installed more easily by simply putting it in the aeration tank as in the fluidized bed system.

What can be used in the above fixed bed system is that
This is because the microbial contact material unit according to the present invention has an outer space sufficient for water flow and air bubbles to pass through, and even if the unit is laminated in several layers, closed development does not occur during filtration.

As described above in detail, the microbial contact material unit according to the present invention comprises a brush-shaped, ring-shaped or ciliated microbial contact material which has excellent microbial body capacity and cannot be used in the fluidized bed system. A net-like structure that allows water flow and air bubbles to pass sufficiently from the outside to improve the contact state with pollutants in the aeration tank and to stably protect the microbial contact material inside from external impact. Due to the structure that is built in and installed inside the protective casing body that consists of, it has excellent dirt and wastewater treatment capacity and can be used in a fluidized bed system that can be easily put into the aeration tank. Since the specific gravity adjusting body is additionally bonded to the microbial contact material unit to adjust the specific gravity of the unit in various ways, by introducing units of various specific gravities into the aeration tank, Since microorganisms contacting material units is distributed by different in depth by the unit density, it would increase the resolving power of the contaminants to improve the state of contact between the dirty-waste.

On the other hand, the microbial contact material unit according to the present invention has a sufficient space for water flow and air bubbles to pass through it, so that even if the unit is laminated in any number of layers, closed development can be performed during filtration. If it does not happen, it can be easily installed and used even in the fixed bed system, and it is a deodorization tower, an absorption tower that absorbs and decomposes organic substances contained in organic waste gas, or a cleaning tower that absorbs harmful gases. It can also be used in a variety of filling materials such as.

[Brief description of drawings]

FIG. 1A is a perspective view showing only a protective casing body of a microbial contact material unit for fluidized bed system according to a first embodiment of the present invention, and FIG. 1B is a plan view of FIG. 1A.

FIG. 2A is a sectional view taken along the line AA of FIG.
(B) is as shown in Fig. 1 (a) (b) and Fig. 2 (a),
FIG. 3 is a vertical cross-sectional view of a microbial contact material unit in which a scrubber-like microbial contact material is incorporated and installed inside a protective casing body.

FIG. 3 is a sectional view of a microbial contact material unit for fluidized bed system according to a second embodiment of the present invention.

FIG. 4 is a sectional view of a microbial contact material unit for fluidized bed system according to a third embodiment of the present invention.

FIG. 5 is a sectional view of a microbial contact material unit for fluidized bed system according to a fourth embodiment of the present invention.

FIG. 6 is a sectional view of a microbial contact material unit for fluidized bed system according to a fifth embodiment of the present invention.

FIG. 7 is a perspective view showing a microbial contact material unit for a fluidized bed system in which the annular or ciliated microbial contact material of FIG. 10 is installed in a protective casing body according to a sixth embodiment of the present invention.

8 is a perspective view showing a microbial contact material unit for fluidized bed system in which the annular or ciliated microbial contact material of FIG. 10 is installed in a protective casing body according to a seventh embodiment of the present invention.

9 is a perspective view showing a microbial contact material unit for a fluidized bed system in which the annular or ciliated microbial contact material of FIG. 10 is installed in a protective casing body according to an eighth embodiment of the present invention.

FIG. 10A is a vertical cross-sectional view of a ring-shaped microbial contact material unit, and FIG. 10B is a vertical cross-sectional view of a ciliated microbial contact material unit.

FIG. 11 is a vertical cross-sectional view of a microbial contact material unit capable of adjusting specific gravity, in which a specific gravity adjusting object is inserted into the microbial contact material unit according to the first embodiment of the present invention.

FIG. 12 is a perspective view of an embodiment in which all microbial contact material units according to the present invention are installed by a fixed bed method.

[Explanation of symbols]

1a, 1b, 1c, 1d, 1e, 1f: Protective casing body 2: Hemispherical case 3: Circular connecting rib 4: Horizontal rib 5: Vertical rib 6: Assembly pin 6: Assembly pin storage port 8a, 8b: Fixed pin 9a , 9b, 9c: Scourer-like microbial contact material 10a, 10b: Outer case 11a, 11b: Inner case 12: Connecting rib 13: Outward pin 14: Inward pin 15: Circular microbial contact material 16: Cilia-like microbial contact material 17: Circular Frame 18: Vertical load 19: Hanging body 20: Metal core 21: Synthetic resin thread ring 22: Synthetic resin thread cilia 23: Specific gravity adjusting object 24: Fixed bed support frame 25: Microbial contact material unit 26: Iron net or net

Claims (13)

[Claims] 1. A microbial contact material unit in which a normal microbial contact material is inserted inside a reticulated protective casing body so that water flow and air bubbles can flow to the outside and outside. 2. The microbial contact material unit according to claim 1, wherein the microbial contact material is any one selected from the group consisting of brush-shaped, annular, and ciliated microbial contact materials. 3. The microbial contact material unit according to claim 1, wherein a specific gravity adjusting body for adjusting the specific gravity of the unit is additionally connected to the protective casing body. 4. The protective casing body has a net-like structure on its surface, and has a connecting structure to which two types of upper and lower hemispherical cases having a fixed space are detachably attached. The surface of one of the hemispherical cases is composed of a circular meshing rib, which is a connecting portion of the lower hemispherical case, and horizontal ribs and vertical ribs are crossed in a dome shape to form an integral mesh structure. In the circular coupling rib, the assembly pin and the assembly pin storage port are alternately formed so as to be assembled with the other hemispherical case. The two types of fixing pins for fixing the microbial contact material are each made of two kinds of circumferential shape, and the microbial contact material is in the form of a mat, and is firmly fixed by the mutual fixing pins. Being done The microbial contact material unit according to claim 1, which is characterized in that. 5. Among the two kinds of fixing pins consisting of the above-mentioned two kinds of circumferential shapes, inside one kind of circumferential fixing pin,
5. The microbial contact material unit according to claim 4, wherein a specific gravity adjusting object for adjusting the specific gravity of the unit is additionally inserted. 6. The protective casing body comprises a double case integrally connected by a connecting rib of an outer case and a inner case having a net-like structure, and the inner case has a spherical scrubber shape. The microbial contact material unit according to claim 1, wherein the microbial contact material is filled. 7. The protective casing body is characterized in that a large number of outward pins are formed on the outer surface of an inner case having a reticulated structure, and the inner case is filled with a brush-like microbial contact material. The microbial contact material unit according to claim 1. 8. The protective casing body, wherein a large number of inward pins are formed on the inner surface of an outer case having a reticulated structure, and a brush-shaped microbial contact material is provided in an inner space surrounded by the ends of the inward pins. The microbial contact material unit according to claim 1, wherein the microbial contact material unit is supported and filled by the built-in pin. 9. The microbial contact material unit according to claim 8, wherein the scrubber-like microbial contact material has the same shape as a mat. 10. In the protective casing body, a large number of circular frames are integrally connected by a large number of vertical loads, while rings are attached to the inside of the vertical loads with a constant gap or grooves. It is composed of a cylindrical frame in which a hanging body is formed by being dug, and the microbial contact material is characterized in that it is installed spirally on the hanging body as an annular or ciliated microbial contact material. The microbial contact material unit according to claim 1. 11. In the protective casing body, a large number of circular frames are integrally connected by a large number of vertical loads, while rings are attached to the outside of the vertical loads with a constant gap or grooves. It is composed of a cylindrical frame in which a hanging ring is formed by being dug, and the microbial contact material is installed in a number of circumferential shapes on the hanging ring as an annular or ciliated microbial contact material. Claim 1 characterized by
The microbial contact material unit according to the item. 12. The protective casing body has a spherical frame having a net-like structure on the same surface and a hook body formed on the inner surface, and the microbial contact material is ring-shaped or cilia-shaped. The microbial contact material unit according to claim 1, wherein the microbial contact material is provided in a spiral shape as the microbial contact material on the hook body. 13. The microbial contact according to any one of claims 1 to 12, wherein the microbial contact material unit is laminated inside a fixed support frame, and each surface of the frame is made of iron net or net. Fixed floor structure of timber unit.