JP2001276864A - Equipment and method for treating sewage water - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an efficient sewage water treatment technique. SOLUTION: This equipment is provided with a carrier fluidization vessel 10, a carrier packed section 20 that is placed in the carrier fluidization vessel 10 and packed with a granular carrier C on which aerobic microorganisms are stuck in such an amount that the carrier C can be fluidized in the section 20, and also provided with current plates 30 each for forming an upward flow path 21 and a downward flow path 22 within the carrier packed section 20. An air diffuser 11 for supplying air through a diffuser pipe 11a is placed at a position corresponding to the upwardly oriented paths 21. By supplying air through the diffuser pipe 11a, sewage to be treated and the granular carrier C are circulated in prescribed directions (such as directions of arrows 40 and 42 in the figure) along circulation paths consisting of the upward flow path 21 and downward flow path 22.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage treatment technique, and more particularly to a sewage treatment technique in which an aerobic microorganism-immobilized carrier is caused to flow in treated water to perform aerobic treatment.

[0002]

2. Description of the Related Art Conventionally, there is known a sewage treatment tank for purifying raw sewage discharged from a general household, for example. This type of sewage treatment tank decomposes (oxidizes and reduces) organic pollutants in sewage by using aerobic and anaerobic microorganisms.
So-called biological treatment is performed. Such a conventional sewage treatment tank is provided with an air diffuser for supplying air (oxygen) to the bottom in the tank. In addition, for example, a certain amount of a carrier on which an aerobic microorganism is implanted is packed. The air is supplied into the tank by the air diffuser, so that the water to be treated and the carrier flow by the upward flow of the air. As described above, a technique is known in which aerobic microorganisms are efficiently brought into contact with organic pollutants and the like in water to be treated by flowing a carrier, and the organic pollutants and the like are decomposed (oxidized) by the aerobic microorganisms. . Such processing is generally called aerobic processing (biological processing). In addition, the sludge and the like generated during the aerobic treatment are filtered by a carrier, and air is supplied to the carrier from an air diffuser, whereby the sludge and the like captured by the carrier are physically separated by an air flow, and the sludge is removed. There is known a technique of extracting backwash water containing water from a sewage treatment tank. The process of removing sludge and the like filtered by the carrier from the sewage treatment tank in this way is generally called a backwashing process.

[0003]

The above-mentioned conventional sewage treatment tank is generally configured such that an upward flow of air is formed from the bottom of the tank to the entire surface of the tank by a diffuser. However, in such a configuration, when the water to be treated flows (convects) in the tank due to the upward flow of air, the upward flow and the downward flow of the water to be treated collide with each other, There were places where water partially stayed, and the water to be treated did not flow smoothly. In such a case, the carrier may not be uniformly dispersed in the water to be treated, for example, at the time of the backwashing process, it is difficult to peel off the sludge or the like captured by the carrier, and the efficiency of the backwashing process is reduced. There was a problem. In addition, even during the aerobic treatment, if the carrier is not uniformly dispersed in the water to be treated, there is a problem that the efficiency of the aerobic treatment decreases because the aerobic microorganisms do not efficiently contact the organic pollutants and the like. . Therefore, usually, by adjusting the amount of air from the air diffuser, a desired flow state is set such that the carrier is uniformly dispersed in the water to be treated.

[0004] However, the present inventors have found that if the flow of the water to be treated can be prevented as much as possible and the flow of the water to be treated can be smoothened, the carrier can be uniformly dispersed in the water to be treated with a smaller amount of air than before. Thought that it can be distributed to
The effluent in the above-mentioned conventional sewage treatment tank was studied diligently. As a result, the present inventors have succeeded in finding that by improving the conventional sewage treatment tank, a desired fluidized state can be realized with a smaller amount of air than before. Then, an object of the present invention is to provide an efficient sewage treatment technology.

[0005]

Means for Solving the Problems To solve the above problems, a sewage treatment apparatus of the present invention is configured as described in claim 1. Here, the terms described in claim 1, other claims and the detailed description of the invention are interpreted as follows unless particularly limited. (1) "Carrier" includes, for example, perlite, shirasu balloon, foamed concrete, activated carbon, porous ceramic,
Inorganic carriers such as porous glass and synthetic resin carriers such as polyethylene, polypropylene, polyvinyl chloride and polyurethane are included. (2) The “circulation path” includes, in addition to a path formed by structurally dividing the treatment tank, a path that can form a circulation flow of the water to be treated as a result. For example, the tank itself or a member provided in the tank may have a shape for forming a circulating flow in the water to be treated, for example, a corner in the tank may have an arc shape. In addition, for example, a circulating flow may be formed depending on the relationship between the structure of the treatment tank and the flow direction of the water to be treated.

According to the sewage treatment apparatus of the first aspect, when the gas flow is supplied from the oxygen supply means, the water to be treated can be circulated in the treatment tank in a predetermined direction along the circulation path. . This allows the water to be treated to flow smoothly in the processing tank. Therefore, even when the amount of gas from the oxygen supply unit is minimized, the carrier can be uniformly dispersed in the water to be treated because the water to be treated flows smoothly.

Here, in the treatment tank, an upward flow path and a downward flow path are formed by the partition member, and oxygen supply means is provided at a location corresponding to the upward flow path. Preferably, it is provided. According to such a configuration, when the gas flow is applied to the water to be treated from the oxygen supply means, the water to be treated is circulated according to the upward flow path and the downward flow path formed by the partition member. Can be. Therefore, even if the amount of gas from the oxygen supply means is suppressed as much as possible, the water to be treated and the carrier can flow smoothly in the treatment tank, and the carrier can be uniformly dispersed in the water to be treated. Further, since the water to be treated can be circulated by supplying the gas flow from the oxygen supply means only to the upward flow path side, the supply range of the gas flow is reduced and the efficiency is reduced.

According to the third aspect of the present invention, the gas flow is supplied from the oxygen supply means to the water to be treated, whereby the upward flow path and the downward flow path formed by the partition member are provided. The water to be treated can be circulated according to the above. Therefore, even when the amount of gas from the oxygen supply means is minimized, the water to be treated and the carrier can smoothly flow in the treatment tank, and the carrier can be uniformly dispersed in the water to be treated. The water to be treated can be efficiently treated by the microorganism. In addition, since the water to be treated can be circulated by supplying the gas flow from the oxygen supply means only to the upward flow path side, when performing aerobic treatment, the gas flow supply range is reduced and the efficiency is reduced. It is a target.

According to the sewage treatment method of the present invention, an upward flow path and a downward flow path formed by the partition member are provided by applying a gas flow from the oxygen supply means to the water to be treated. The water to be treated can be circulated according to the above. Therefore, even when the amount of gas from the oxygen supply unit is minimized, the water to be treated and the carrier can smoothly flow in the treatment tank, and the carrier can be uniformly dispersed in the water to be treated. Efficient separation of sludge, etc.
Backwashing of the carrier can be performed. Further, since the water to be treated can be circulated by supplying the gas flow from the oxygen supply means only to the upward flow path side, the range of supplying the gas flow is reduced when performing the backwashing process, and the efficiency is reduced. It is a target.

[0010]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The construction and the like of a carrier fluidizing tank according to first and second embodiments of the present invention will be described below with reference to the drawings. Here, FIG. 1 is a diagram showing an outline of a wastewater treatment process. 2 and 3 are schematic diagrams of the carrier flow tank of the first embodiment, and show a state where the granular carrier C is flowing in the water to be treated.

[First Embodiment] As shown in FIG. 1, raw sewage discharged from, for example, a general household is fed into a contaminant removal tank 1, an anaerobic filter bed tank 2, a carrier fluidizing tank 10, a treatment water tank 3, a disinfection tank, and the like. The wastewater is sequentially treated by a wastewater treatment device including a tank 4 and the like.
Released as purified water. In the contaminant removal tank 1, solid-liquid separation of large solids and fats and oils contained in the raw sewage is performed.
In the anaerobic filter bed tank 2, organic pollutants and the like in the treated water treated in the impurity removing tank 1 are anaerobically decomposed (reduced) by the action of anaerobic microorganisms. In the carrier fluidized tank 10 (corresponding to the treatment tank in the present invention), the organic pollutants and the like in the treated water A treated in the anaerobic filter bed tank 2 are removed under aerobic conditions in the presence of oxygen. Aerobic treatment (oxidation) by aerobic microorganisms inside. In the treatment tank 3,
The treated water treated in the carrier fluidized tank 10 is temporarily stored,
It is circulated to the contaminant removal tank 1 as needed. In the disinfection tank 4, the treated water before being discharged is disinfected.

As shown in FIG. 2, an inlet 13 and an outlet 14 are provided in the tank body 12 of the carrier flowing tank 10. The inflow port 13 receives the treated water A extracted from the anaerobic filter bed tank 2 in FIG. In addition, the outlet 14 is for extracting the treated water treated in the carrier fluidizing tank 10 from the tank body 12. Then, the treated water A received from the inflow port 13 is configured to be continuously purified in the carrier fluidized tank 10.

Next, the internal structure of the tank body 12 will be described. The tank main body 12 is provided with a carrier filling section 20 partitioned by an upper porous member 18 and a lower porous member 19. For example, a predetermined amount of a granular carrier C (corresponding to the carrier in the present invention) formed in a hollow cylindrical shape is filled in the carrier filling portion 20 to such an extent that it flows. Aerobic microorganisms that decompose (oxidize) organic pollutants under aerobic conditions in the presence of oxygen are implanted in the granular carrier C. Each of the upper porous member 18 and the lower porous member 19 is a porous plate having a plurality of holes, and is configured to allow passage of a fluid or the like, but block passage of the granular carrier C. Therefore, the granular carrier C can flow in the carrier filling section 20 defined by the upper porous member 18 and the lower porous member 19.

The carrier filling section 20 is provided with a plate-shaped current plate 30 (corresponding to the partition member in the present invention). The rectifying plate 30 is provided in two pieces, each of which is arranged and fixed in parallel in a direction orthogonal to the porous members 18 and 19, that is, along an upward flow of air supplied from the diffuser 11 described later. I have. Therefore, the cross section of the tank main body 12 is partially defined by the current plate 30. As a result, an upward flow path 21 is formed at the center of the tank body 12, and the upward flow path 2
Downstream flow paths 22 are formed on both sides of the vehicle 1. In addition, the circulation path of the present invention is formed by the upward flow path 21, the downward flow path 22, and the like. Further, a diffuser 11 as an oxygen supply means of the present invention is installed below the lower porous member 19 and at a position corresponding to the upward flow path 21. The air diffuser 11 includes an air diffuser 1 connected to a blower (not shown).
1a, the air diffuser 1
A predetermined amount of air (gas containing oxygen) is supplied from 1a to the carrier filling section 20. The upward flow of air from the air diffuser 11 causes the upward flow path 21 to rise.
An upward flow is formed in the water to be treated at
Is configured such that a downward flow is formed in the water to be treated. Therefore, a circulating flow of the water to be treated in a predetermined direction, for example, a circulating flow in the directions of arrows 40 and 42 in FIG. The granular carrier C is configured to flow in the water to be treated by the circulating flow. The processing tanks other than the carrier fluidizing tank 10 are well known, and detailed description of the configuration of the other processing tanks is omitted.

Next, a method for treating sewage by the carrier fluidized tank 10 having the above-described configuration will be described. Here, a case will be described in which the organic pollutants and the like of the water to be treated are aerobic-treated using aerobic microorganisms in the carrier fluidizing tank 10.

First, while supplying a predetermined amount of treated water A from the inlet 13 to the carrier fluidizing tank 10 and operating the diffuser 11, the water to be treated (water level line W
Air containing oxygen is supplied to L). Thereby, oxygen is provided to the aerobic microorganisms that have been implanted on the granular carrier C of the carrier filling unit 20, and an aerobic condition is established under which the aerobic microorganisms can perform aerobic treatment. Therefore, the organic pollutants contained in the water to be treated are decomposed (oxidized) by the aerobic microorganisms. Since air is supplied to the upward flow path 21 defined by the rectifying plate 30, the upward flow of the air forms an upward flow of the water to be treated in the upward flow path 21. Then, the downward flow of the water to be treated is formed in the downward flow path 22 by the upward flow of the water to be treated. Therefore, a circulating flow of the water to be treated is formed in the directions of arrows 40 and 42 in FIG. 2, and the circulating flow uniformly disperses the granular carrier C in the tank. Thereby, the aerobic microorganisms can be efficiently brought into contact with the organic pollutants and the like in the water to be treated, and the efficiency of the aerobic treatment increases. Further, since the water to be treated flows smoothly along the flow straightening plate 30, the upward flow of the air is efficiently used for the flow of the water to be treated and the granular carrier C.

The arrangement and the number of rectifying plates are not limited. For example, as shown in FIG. 3, one rectifying plate 30 may be arranged in the carrier filling section 20 of the tank body 12. . In FIG. 3, the same elements as those shown in FIG. 2 are denoted by the same reference numerals. In FIG. 3, an upward flow path 21 and a downward flow path 22 are formed via a straightening plate 30. A diffuser 11 having a diffuser pipe 11a is provided below the lower porous member 19 and at a position corresponding to the upward flow path 21. Due to the upward flow of the air from the air diffuser 11, an upward flow is formed in the water to be treated in the upward flow path 21 and a downward flow is formed in the water to be treated in the downward flow path 22. Then, a circulating flow of the water to be treated (for example, a flow in the direction of arrow 44 in FIG. 3) is formed. In this way, the flow of the water to be treated and the granular carrier C can be further reduced by reducing the number of the flow straightening plates 30 as much as possible, or by arranging the flow straightening plates 30 so as not to obstruct the flow of the water to be treated as much as possible. It can be smoothed.

According to the carrier flow tank 10 and the method for treating wastewater using the carrier flow tank 10 of the first embodiment configured as described above, the upward flow path 21 and the downward flow path 22
Is provided, the water to be treated and the granular carrier C can flow smoothly (circulate in a predetermined direction) during the aerobic treatment with a relatively simple configuration. Further, by supplying air from the air diffuser 11 to the upward flow path 21, the water to be treated and the granular carrier C can be circulated, so that the air supply range is small and the efficiency is small. . Thereby, the amount of air supplied from the air diffuser 11 can be reduced as much as possible.

[Second Embodiment] Next, the configuration and the like of a carrier fluidizing tank 50 according to a second embodiment of the present invention will be described with reference to FIGS. In the first embodiment, the case where the aerobic treatment is performed by the carrier fluidized tank 10 is described. In the second embodiment, the case where the aerobic treatment, the filtration treatment, and the backwashing treatment are performed by the carrier fluidized tank 50 is described. explain. Here, FIG. 4 is a schematic diagram of the carrier fluidizing tank 50, and shows a state during an aerobic treatment and a filtration treatment. FIG. 5 is a schematic view of the carrier fluidizing tank 50, showing a state at the time of the backwashing process. Note that FIG.
Are given the same reference numerals.
Further, the main configuration of the carrier fluidized tank 50 is the same as that of the carrier fluidized vessel 10 of the first embodiment, and therefore, a configuration different from the carrier fluidized vessel 10 will be described here for the sake of simplicity.

As shown in FIG. 4, an aerobic treatment area 23 and a filtration treatment area 24 are formed in the carrier filling section 20 of the tank body 12 with an air diffuser 51 as a boundary. In the aerobic treatment area 23, two plate-shaped flow straightening plates 60 are disposed and fixed, and the upward flow path 21 and the downward flow path 22 are formed through the flow straightening plate 60. Also, aerobic treatment area 2
An air diffuser 51 having an air diffuser 51a is provided at a location corresponding to the upward flow path 3 of FIG. Further, two pieces of straightening plates 62 are provided in the filtering area 24, and the upward flow path 21 and the downward flow path 22 are formed through the straightening plate 62. A diffuser 52 having a diffuser tube 52a is provided below the lower porous member 19 and at a location corresponding to the upward flow path 21 of the filtration region 24.

Next, a method of treating sewage by the carrier fluidizing tank 50 having the above-described configuration will be described. Here, in the carrier fluidizing tank 50, the organic pollutants and the like of the water to be treated are aerobic-treated using aerobic microorganisms, and the sludge and the like generated during the aerobic treatment are filtered by the granular carrier and captured by the granular carrier. The case where the sludge and the like thus separated are separated by an air flow and the granular carrier is backwashed will be described.

First, by operating the air diffuser 51, air containing oxygen is supplied to the water to be treated stored in the aerobic treatment area 23. Thereby, oxygen is provided to the aerobic microorganisms that have been implanted on the granular carrier C1 in the aerobic treatment region 23, and an aerobic condition is established under which the aerobic microorganisms can perform the aerobic treatment. Therefore, the organic pollutants contained in the water to be treated are decomposed (oxidized) by the aerobic microorganisms. Since air is supplied to the upward flow path 21 defined by the rectifying plate 60, the upward flow of the air forms an upward flow of the water to be treated in the upward flow path 21.
The upward flow of the water to be treated causes the downward flow path 22
A downward flow is formed in the water to be treated. Accordingly, a circulating flow in a predetermined direction of the water to be treated, for example, a circulating flow in the directions of arrows 70 and 72 in FIG. 4 is formed, and the granular carrier C1 is uniformly dispersed in the aerobic treatment region 23 by the circulating flow. Thereby, the aerobic microorganisms are efficiently brought into contact with the organic pollutants in the water to be treated, and the efficiency of the aerobic treatment is increased. Further, since the water to be treated flows smoothly along the straightening plate 60, the upward flow of the air is efficiently used for circulation of the water to be treated.

The aerobic treatment is performed in the aerobic treatment area 23, while the sludge generated by the aerobic treatment is filtered by the particulate carrier C2 in the filtration treatment area 24. At this time, the operation of the air diffuser 52 is stopped, and the air diffuser 52a is stopped.
Does not supply air. Therefore, the granular carriers C2 in the filtration region 24 are in a state of being densely packed, and sludge and the like are efficiently captured by the granular carriers C2 by such a filling structure of the granular carriers C2.

Next, after the aerobic treatment and the filtration treatment are completed, a backwash treatment of the granular carrier C2 is performed. In this backwashing process, for example, the operation of the diffuser 51 is stopped and the diffuser 52 is stopped.
Drive. As a result, air is supplied to the upward flow path 21 defined by the straightening plates 60 and 62,
Due to the upward flow of the air, for example, the arrow 7 in FIG.
A circulating flow of the water to be treated is formed in the 4,76 directions. Then, the granular carriers C1 and C2 are uniformly dispersed in the tank by the circulating flow. Thereby, the sludge and the like captured by the granular carrier C2 are efficiently separated. And the granular carrier C2
Backwash water containing sludge and the like separated from the tank is drawn out from the tank body 12 through the outlet 14. In this backwashing process, it is preferable to supply a larger amount of air than in the aerobic process. Thereby, the granular carrier C2 can be made to flow more violently, so that the sludge and the like captured by the granular carrier C2 can be more easily separated.

According to the carrier flow tank 50 and the wastewater treatment method using the carrier flow tank 50 according to the second embodiment configured as described above, the provision of the flow straightening plates 60 and 62 makes it relatively simple. The water to be treated and the granular carrier C during aerobic treatment, filtration treatment, and backwash treatment
1 and C2 can flow smoothly. In addition, air is supplied from the air diffuser 51 to the upward flow path 21 during aerobic processing and filtration processing, and air is supplied from the air diffuser 52 to the upward flow path 21 during backwash processing. Therefore, the air supply range is small and the air supply is efficient. Thereby, the amount of air supplied from the air diffusers 51 and 52 can be reduced as much as possible.

[Other Embodiments] The present invention is not limited to the above embodiment, and various applications and modifications are conceivable.

In the first embodiment, for example, the case where the water to be treated circulates in the directions of arrows 40 and 42 in FIG. 2 has been described. However, the direction in which the water to be treated circulates is not limited. It can be selected as needed. Also, for example,
The direction in which the water to be treated circulates can be switched. This will be described with reference to FIGS. Here, both FIG. 6 and FIG. 7 are schematic diagrams of a carrier fluidizing tank of another embodiment. 6 and 7, the same elements as those shown in FIG. 2 are denoted by the same reference numerals. As shown in FIGS. 6 and 7, an air diffuser 11 a is provided at a location corresponding to the upward flow path 21,
A diffuser 11 is provided at a position corresponding to the downward flow path 22 on both sides thereof.
b is provided. In such a configuration, by supplying air from the air diffuser 11a, a circulating flow (outward flow in the figure) in the directions of arrows 40 and 42 in FIG. 6 is formed. On the other hand, by supplying air from the air diffuser 11b, a circulating flow (inner flow in the figure) in the directions of arrows 40 and 42 in FIG. 7 is formed. Therefore, with this configuration, the direction of the circulating flow of the water to be treated can be switched by switching the air diffuser for supplying air as needed.

In the above-described embodiment, the case where the circulation path of the water to be treated is formed by the plate-shaped straightening plates 30, 60, and 62 is described. However, the shape and the like of the straightening plate are not limited. Various changes can be made in accordance with. For example, a configuration may be adopted in which the circulation path of the water to be treated is formed by a movable member instead of a fixed type straightening vane. This will be described with reference to FIG. Here, FIG. 8 is a schematic view of a carrier fluidizing tank according to another embodiment. In FIG. 8, the same elements as those shown in FIG. 2 are denoted by the same reference numerals. As shown in FIG. 8, a rotary blade member 31 (corresponding to a partition member in the present invention) is provided in the tank so as to be rotatable around a rotary shaft 31a. The blade of the rotary blade member 31 is configured to rotate in, for example, a direction indicated by an arrow 48 in FIG. Therefore, the air diffuser 11 is moved to a location corresponding to the upward flow path 21.
a to supply the air from the rotating blade member 3.
1 rotates in the direction of arrow 48 about the rotation axis 31a,
Thus, an upward flow of the water to be treated is formed in the upward flow path 21, and a downward flow of the water to be treated is formed in the downward flow path 22. Then, the water to be treated circulates in the circulation path formed by the upward flow path 21 and the downward flow path 22 in the direction of the arrow 46 in the figure.

Further, in the above embodiment, the case where the water to be treated and the particulate carrier circulate along the circulation path formed by the upward flow path 21 and the downward flow path 22 has been described. The shape and the like are not limited, and can be variously changed according to, for example, the shape and arrangement of the current plate.
The treatment tank may have any structure as long as it can form a circulating flow of the water to be treated, and the shape of the tank itself or members provided in the tank is not limited.

Further, in the above embodiment, the case where oxygen-containing air is supplied from the air diffusers 11, 51, and 52 as the oxygen supply means has been described, but the gas supplied from the oxygen supply means is a gas containing oxygen. Any gas may be used, and various gases other than air may be used.

In the above embodiment, the carrier fluidization tanks 10 and 50 for performing aerobic treatment and the like have been described. However, other treatment tanks (for example, a contaminant removal tank 1, an anaerobic filter bed tank 2, a treatment water tank 3, etc.) And a processing device incorporating the function of the disinfection tank 4).

Further, in the above embodiment, as the carrier on which the microorganisms are implanted, the granular carrier C formed into a cylindrical shape,
Although the case where C1 and C2 are used has been described, the shape and material of the carrier are not limited, and can be variously changed as needed.

[0033]

As described above, according to the present invention,
An efficient sewage treatment technology can be realized.

[Brief description of the drawings]

FIG. 1 is a diagram showing an outline of a wastewater treatment process.

FIG. 2 is a schematic view of the carrier fluidizing tank according to the first embodiment, and shows a state in which granular carriers are flowing in the water to be treated.

FIG. 3 is a schematic diagram of a carrier fluidizing tank according to the first embodiment, and shows a state in which a granular carrier is flowing in water to be treated.

FIG. 4 is a schematic view of a carrier fluidizing tank according to a second embodiment, showing a state during an aerobic treatment and a filtration treatment.

FIG. 5 is a schematic view of a carrier fluidizing tank according to a second embodiment, showing a state at the time of a backwashing process.

FIG. 6 is a schematic view of a carrier fluidizing tank according to another embodiment.

FIG. 7 is a schematic view of a carrier fluidizing tank according to another embodiment.

FIG. 8 is a schematic view of a carrier fluidizing tank according to another embodiment.

[Explanation of symbols]

 10, 50: carrier fluidizing tank (treatment tank) 11, 51, 52: diffuser 11a, 11b, 51a, 52a: diffuser tube 18: upper porous member 19: lower porous member 20: carrier filling portion 21: upward flow Path 22: Downflow path 30, 60, 62 ... Rectifier plate 31: Rotating blade member C, C1, C2 ... Granular carrier

Claims (4)

[Claims] 1. A treatment tank filled with a carrier having an aerobic microorganism implanted thereon, and an oxygen supply means for supplying oxygen to the treatment tank, wherein the water to be treated is supplied by a gas flow from the oxygen supply means. A sewage treatment apparatus configured to flow with the carrier, wherein the treatment tank is configured to form a circulation path in a predetermined direction of the water to be treated. Processing equipment. 2. The sewage treatment apparatus according to claim 1, further comprising a partition member for partitioning the treatment tank, wherein the partition member defines the circulation path and the upward flow path and the downward flow path. Wherein the oxygen supply means is provided at a location corresponding to the upward flow path. 3. A processing tank filled with a carrier on which aerobic microorganisms have been implanted, oxygen supply means for supplying oxygen to the processing tank, and the processing tank having an upward flow path and a downward flow path. A partitioning member for partitioning, by applying a gas flow to the water to be treated in the upward flow path by the oxygen supply means, and converting the water to be treated into a circulation path comprising the upward flow path and the downward flow path. Circulating the carrier in the water to be treated, and performing aerobic treatment of the water to be treated with the aerobic microorganisms. 4. A processing tank filled with a carrier having an aerobic microorganism implanted thereon, oxygen supply means for supplying oxygen to the processing tank, and the processing tank having an upward flow path and a downward flow path. A partition member for partitioning, oxygen is provided to the aerobic microorganisms by the oxygen supply means, the water to be treated is treated by the aerobic microorganisms, and sludge and the like generated during the treatment are filtered by the carrier. Applying a gas flow to the water to be treated in the upward flow path by the oxygen supply means, circulating the water to be treated through a circulation path comprising the upward flow path and the downward flow path, A method for treating sewage, comprising flowing in the water to be treated, separating the sludge and the like from the carrier, and performing backwashing of the carrier.