JP4573997B2 - Sewage treatment apparatus and treatment method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to sewage treatment using a carrier, and more particularly to a sewage treatment technique using a carrier on which a microorganism for biologically treating sewage is deposited.
[0002]
[Prior art]
Conventionally, for example, a sewage treatment tank that purifies raw sewage discharged from a general household is known. In such a conventional sewage treatment tank, a certain amount of granular carrier in which aerobic microorganisms are implanted is filled in the carrier filling portion. Moreover, the partition which divides this support | carrier filling part into a biological treatment area | region and a filtration area | region, the communication port which enables the movement of the granular support | carrier between both area | regions, the 1st air diffuser which supplies air to a biological treatment area | region, the filtration area | region A second air diffuser for supplying air is provided. Then, by supplying air to the biological treatment area or the filtration area, the sewage in the tank circulates between the biological treatment area and the filtration area, and the granular carrier moves through the communication port.
In the sewage treatment tank having such a configuration, a so-called biological treatment is performed in which organic pollutants in the sewage are decomposed by aerobic microorganisms by supplying air from the first air diffuser to the biological treatment region. Moreover, the filtration process which filters the to-be-filtered material etc. which generate | occur | produce by this biological treatment with a granular support | carrier is performed. Thereafter, by supplying air from the second air diffuser to the filtration region, sludge and the like captured by the particulate carrier in the filtration region is physically separated by the air flow, and backwash water containing sludge and the like is removed from the sewage treatment tank. A so-called back washing process is performed.
[0003]
[Problems to be solved by the invention]
In the conventional sewage treatment tank, since the communication port is provided at the boundary between the air supply unit from the first air diffuser and the air supply unit from the second air diffuser, air is provided near the communication port. In some cases, a portion not formed is formed. In such a case, for example, at the time of backwash processing for supplying air from the second air diffuser to the filtration region, a stationary region of the granular carrier is formed near the communication port, and the granular carrier in the biological treatment region is filtered. There was a problem that it was difficult to move to the area side.
[0004]
Therefore, the present invention has been made in view of the above points, and an object of the present invention is to provide a sewage treatment apparatus in which a carrier on which microorganisms are implanted is movably filled in a treatment tank. It is to provide a rational sewage treatment technique that can improve the treatment efficiency of sewage by facilitating the movement.
[0005]
[Means for Solving the Problems]
In order to solve the above problems, the wastewater treatment apparatus of the present invention is configured as described in claims 1 to 3. Moreover, the wastewater treatment method of the present invention is as described in claims 4 to 6.
[0006]
The sewage treatment apparatus according to claim 1, wherein the treatment tank is filled with a carrier on which microorganisms are deposited. These microorganisms include aerobic microorganisms that aerobically decompose organic pollutants in wastewater and anaerobic microorganisms that anaerobically decompose. Further, the treatment apparatus includes a partition that divides the inside of the treatment tank into a biological treatment region and a filtration region, a communication portion that communicates the biological treatment region and the filtration region, and a first air diffuser that supplies air to the biological treatment region. And a second air diffuser for supplying air to the filtration region. The treatment apparatus is provided with a communication part at the lower part of the partition wall and a third air diffusion part that protrudes toward the biological treatment region through a point immediately below the partition wall.
Then, when air is supplied from the second air diffuser, the wastewater to be treated in the tank is circulated by the upward flow of the air , and a part of the carrier in the biological treatment area moves to the filtration area via the communication part. To do. At this time, air is supplied to the carrier in the communication portion by the third air diffuser. Here, it is preferable that the air flow rate supplied to the carrier in the communication portion is such that the carrier can be fluidized. As a result, in the process in which the carrier (typically part) moves from the biological treatment region to the filtration region, it is possible to prevent the formation of a stationary region of the carrier in the vicinity of the communicating portion, and smooth movement of the carrier Will be maintained.
Further, when air is supplied from the first air diffuser to the biological treatment area, air is not supplied from the third air diffuser to the carrier of the communication part, so that the air inadvertently flows into the filter area and hinders filtration. Can be avoided as much as possible. The “carrier” in the present invention includes, for example, inorganic carriers such as perlite, shirasu balloon, foamed concrete, activated carbon, porous ceramic, porous glass, and synthetic resin systems such as polyethylene, polypropylene, polyvinyl chloride, and polyurethane. A carrier shall be included.
As described above, according to the sewage treatment apparatus of the first aspect, the treatment efficiency can be improved by maintaining the smooth movement of the carrier.
[0007]
In the sewage treatment apparatus according to claim 2, air is supplied from the third air diffuser to not only the communicating part but also the biological treatment area. The air supplied from the third air diffuser is set to a flow rate that can fluidize the carrier in the biological treatment region and is smaller than that of the first air diffuser. In other words, the air flow rate supplied from the third air diffuser is preferably as small as possible after allowing the carrier in the biological treatment area to be fluidized.
Thereby, when the back washing process of the filtration area is performed by the second air diffuser, the back washing process of the biological treatment area can be performed together, so that the back washing efficiency can be increased. In addition, the air supply capability of the third air diffuser can be suppressed as much as possible, and the air supply means such as a blower can be reduced in size.
Therefore, according to the sewage treatment apparatus according to the second aspect, the backwashing efficiency can be particularly improved while maintaining the smooth movement of the carrier.
[0008]
In addition, as described in claim 3, it is preferable that the second diffuser and the third diffuser are integrally formed. Thereby, the structure of an aeration part can be simplified.
[0009]
In the sewage treatment method according to claim 4, the sewage to be treated is biologically treated by microorganisms by sequentially performing a predetermined procedure in the first treatment step, and the material to be filtered is supported by a carrier (the remaining carrier) . Filtered. Next, by performing a predetermined procedure sequentially in the second treatment step, a backwash process is performed in which the material to be filtered is peeled off from the carrier in the filtration region and the material to be filtered is extracted from the processing tank. At this time, in the process in which the carrier (typically part) moves from the biological treatment region to the filtration region, an immobile region of the carrier is formed in the vicinity of the communicating portion by the upward flow of air from the third air diffuser. Therefore, the smooth movement of the carrier is maintained. Further, when air is supplied from the first air diffuser to the biological treatment area, air is not supplied from the third air diffuser to the carrier of the communication part, so that the air inadvertently flows into the filter area and hinders filtration. Can be avoided as much as possible.
As described above, according to the method for treating sewage described in claim 4, the treatment efficiency can be improved by maintaining the smooth movement of the carrier.
[0010]
In the sewage treatment method according to the fifth aspect, air is supplied from the third air diffuser to the communication part and the biological treatment area in the second treatment step. Then, the air supplied from the third air diffuser is set so that the carrier in the biological treatment area can be fluidized and the flow rate is smaller than that of the first air diffuser. In other words, the air flow rate supplied from the third air diffuser is preferably as small as possible after allowing the carrier in the biological treatment area to be fluidized.
Thereby, when performing the backwash process of a filtration area | region by a 2nd air diffuser, since the backwash process of a biological treatment area | region can also be performed by a 3rd air diffuser part, backwash efficiency is raised. be able to. In addition, the air supply capability of the third air diffuser can be suppressed as much as possible, and the air supply means such as a blower can be reduced in size.
Therefore, according to the method for treating sewage described in claim 5, the backwashing efficiency can be particularly improved while maintaining the smooth movement of the carrier.
[0011]
In the sewage treatment method according to the sixth aspect, it is preferable that the second diffuser and the third diffuser are integrally formed. Thereby, the structure of an aeration part can be simplified.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Below, the structure of the carrier fluid biological filtration tank of one embodiment of this invention is demonstrated using drawing. Here, FIG. 1 is a diagram showing an outline of the treatment process of sewage. FIG. 2 is a schematic diagram of the carrier fluid biological filtration tank 10.
[0013]
As shown in FIG. 1, for example, raw sewage discharged from a general household is sewage constituted by a contaminant removal tank 1, an anaerobic filter bed tank 2, a carrier fluid biological filtration tank 10, a treatment water tank 3, a disinfection tank 4, and the like. Are sequentially processed by the treatment apparatus and discharged as purified water.
In the contaminant removal tank 1, solid-liquid separation of large solids and oils and fats contained in the raw sewage is performed. Moreover, in the anaerobic filter bed tank 2, the organic pollutant in the treated water treated in the contaminant removal tank 1 is anaerobically decomposed by the action of anaerobic microorganisms. In addition, in the carrier fluid biological filtration tank 10 (corresponding to the treatment tank in the present invention), organic pollutants in the treated water A treated in the anaerobic filter bed tank 2 under aerobic conditions in which oxygen is present. Degraded (oxidized) by aerobic microorganisms in the tank. In the treated water tank 3, treated water treated in the carrier fluid biological filtration tank 10 is temporarily stored and circulated to the contaminant removing tank 1 as necessary. In the sterilization tank 4, the treated water before being discharged is sterilized.
[0014]
As shown in FIG. 2, the tank body 12 of the carrier flow biological filtration tank 10 is provided with an inlet 13 and an outlet 14. The inflow port 13 receives the treated water A extracted from the anaerobic filter bed tank 2 in FIG. Moreover, the outflow port 14 extracts the treated water B treated in the carrier fluid biological filtration tank 10 from the tank body 12. And it is comprised so that the amount of stagnation and the water surface height (water level line WL) in the tank main body 12 may be kept substantially constant. In addition, in FIG. 2, the extraction structure of the treated water B is schematically shown. However, the extracted structure of the treated water B is, for example, the tank body 12 when the treated water B flows out over the tank wall of the tank body 12. This is based on the principle of so-called extrusion flow, in which the amount of stagnant liquid and the water surface height are kept constant. In addition, the amount of stagnant liquid and the water surface height in the tank main body 12 can be configured to be controlled by the balance between the amount received into the tank main body 12 and the amount extracted from the tank main body 12. In this way, the treated water A is treated continuously in the carrier fluid biological filtration tank 10.
[0015]
Further, the downstream side of the outlet 14 is branched into a circulation path 15 and an extraction path 16, and the treated water B extracted from the tank body 12 passes through the circulation path 15 and the extraction path 16. It is configured to be sent to the contaminant removal tank 1 and the treated water tank 3. For example, in the normal operation described later, a part of the treated water B extracted from the tank body 12 is returned to the contaminant removal tank 1 through the circulation path 15 and the rest is sent to the treated water tank 3 through the extraction path 16. Further, in the backwash operation described later, the backwash water extracted from the tank body 12 is sent to the contaminant removal tank 1 through the circulation path 15.
[0016]
Next, the internal configuration of the tank body 12 will be described.
In the tank body 12, a carrier filling region 20 having a height L <b> 1 defined by the upper porous member 18 and the lower porous member 19 is formed. The carrier filling region 20 is filled with, for example, a predetermined amount of granular carrier C (corresponding to the carrier in the present invention) formed in a hollow cylindrical shape. The granular carrier C is implanted with aerobic microorganisms that decompose (oxidize) organic pollutants under aerobic conditions where oxygen is present. The granular carrier C is configured to be movable in the carrier filling region 20 defined by the upper porous member 18 and the lower porous member 19. Each of the upper porous member 18 and the lower porous member 19 is a porous plate having a plurality of holes, and the holes are formed in such a size that the granular carrier C does not pass through. That is, the porous members 18 and 19 allow the treated wastewater to pass but do not allow the granular carrier C to pass. Therefore, the porous members 18 and 19 prevent the granular carrier C from flowing out of the carrier filling region 20.
[0017]
In the carrier filling region 20, the upper porous member 18 is provided with a partition wall 17 having a height H lower than L1. In addition, a communication port 11 (corresponding to the communication portion in the present invention) that communicates the first carrier filling portion 21 and the second carrier filling portion 22 is formed in a lower portion (a position immediately below) of the partition wall 17. The partition wall 17 divides the carrier filling region 20 on the left and right sides. The carrier filling region 20 is partitioned into a first carrier filling part 21 and a second carrier filling part 22 via the partition wall 17. Therefore, the granular carrier C is distributed by the partition wall 17 into the granular carrier C1 belonging to the first carrier filling part 21 and the granular carrier C2 belonging to the second carrier filling part 22. The granular carriers C1 and C2 are configured to be movable between the first carrier filling portion 21 and the second carrier filling portion 22 via the communication port 11. In the initial filling of the granular carrier C into the carrier filling region 20 (FIG. 2), the filling heights in the first carrier filling portion 21 and the second carrier filling portion 22 are both L2 (<L1).
[0018]
A first air diffuser 31 and a second air diffuser 32 are installed below the lower porous member 19, that is, below the first carrier filler 21 and the second carrier filler 22. The air diffusers 31 and 32 are provided with air diffusers 31a and 32a each connected to a blower (not shown), and a predetermined amount of air (containing oxygen) from the air diffuser 31a and the air diffuser 32a by starting each blower. Gas).
The air diffuser 31 a of the first air diffuser 31 is provided at a position corresponding to the first carrier filling portion 21, and the end of the air diffuser 31 a on the partition side is closer to the first carrier filling portion side than the point P directly below the partition 17 ( It is located on the left side in FIG.
[0019]
The air diffuser 32 a of the second air diffuser 32 is provided at a position corresponding to the second carrier filling part 22, and the end of the air diffuser 32 a on the partition side is closer to the first carrier filling part side than the point P directly below the partition 17 ( It is located on the left side in FIG. That is, the air diffuser 32a of the second air diffuser 32 protrudes toward the first carrier filling part. Therefore, for example, when the second air diffuser 32 is operated, the air supplied from the air diffuser 32 a is not only supplied to the second carrier filling part 22 but also a part thereof to the communication port 11 and the first carrier filling part 21. Will also extend. As described above, the air diffuser 32 a has a part for supplying air to the second carrier filling part 22 and a part for supplying air to the communication port 11 and the first carrier filling part 21. The air flow rate supplied from the air diffusion pipe 32a to the first carrier filling part 21 is such that the granular carrier C1 of the first carrier filling part 21 can be fluidized and is supplied from the air diffusion pipe 31a. It is set to be less than the air flow rate.
Note that the air diffuser 31a corresponds to the first air diffuser in the present invention. Further, the portion of the air diffuser 32a that supplies air to the second carrier filling portion 22 corresponds to the second air diffusion portion in the present invention, and supplies air to the communication port 11 and the first carrier filling portion 21. The location corresponds to the third air diffuser in the present invention.
[0020]
Further, when the first air diffuser 31 or the second air diffuser is operated, the wastewater to be treated in the tank circulates between the first carrier filling portion 21 and the second carrier filling portion 22 by the upward flow of air. Is configured to do. Further, along with the circulation of the sewage to be treated, the granular carrier in the carrier filling portion moves between the first carrier filling portion 21 and the second carrier filling portion 22 through the communication port 11, and the distribution ratio of the granular carrier is increased. It is configured to change. That is, when the first air diffuser 31 is operated, a part of the granular carrier C <b> 2 of the second carrier filling part 22 moves into the first carrier filling part 21 through the communication port 11. On the other hand, when the second air diffuser 32 is operated, a part of the granular carrier C1 of the first carrier filling unit 21 moves into the second carrier filling unit 22 through the communication port 11.
In addition, other processing tanks other than the carrier fluid biological filtration tank 10 are well-known, and detailed description about the structure of another processing tank etc. is abbreviate | omitted.
[0021]
Next, a method for treating sewage in the carrier fluid biological filtration tank 10 having the above configuration will be described with reference to FIGS. 3 and 4. Here, FIG. 3 is a schematic view of the carrier fluid biological filtration tank 10 and shows a state during normal operation. FIG. 4 is a schematic diagram of the carrier fluid biological filtration tank 10 and shows a state during the backwash operation.
[0022]
The wastewater treatment method of the present embodiment includes a normal operation and a backwash operation. The normal operation corresponds to the first treatment process in the present invention, and the backwash operation corresponds to the second treatment process in the present invention. In normal operation, organic pollutants in the treated water A are decomposed (oxidized) by aerobic microorganisms under aerobic conditions where oxygen is present, and sludge generated during this decomposition The filtration object is filtered through the granular carrier C. Further, in the backwashing operation, a backwashing process for washing the tank body 12 is performed by removing, from the tank body 12, an object to be filtered such as sludge that has been filtered by the granular carrier C during normal operation and separated from the granular carrier C. Do. In the normal operation of the present embodiment, the first carrier filling unit 21 constitutes an aerobic treatment region (biological treatment region) in which aerobic treatment with aerobic microorganisms is performed, and the second carrier filling unit 22 is to be filtered. A filtration region for performing the filtration is configured. Hereinafter, processing modes in the normal operation and the backwash operation will be described in detail.
[0023]
First, in normal operation, a predetermined amount of treated water A is supplied from the inlet 13 to the tank body 12. Then, the circulating water and the treated water B are extracted from the outlet 14 through the circulation path 15 and the extraction path 16, respectively. And the surface level (water level line WL) of the to-be-processed wastewater stored in the tank main body 12 by the extrusion flow in a tank is kept substantially constant. Further, part of the treated water extracted from the tank body 12 is returned to the contaminant removal tank 1 through the circulation path 15. Since it comprised in this way, compared with the case where process water is extracted from the tank main body 12 by 1 path | pass, the property of the process water B extracted through the extraction path 16 can be stabilized.
[0024]
And by operating the 1st air diffuser 31 in this normal driving | operation, the air containing oxygen is supplied toward the 1st support | carrier filling part 21 from the air diffuser 31a as shown in FIG. Thereby, oxygen is provided to the aerobic microorganisms that have been deposited on the granular carrier C1 of the first carrier filling unit 21, and the first carrier filling unit 21 has an aerobic condition that allows the aerobic microorganisms to perform aerobic treatment. It is formed. That is, the first air diffuser 31 is used for aerobic processing.
[0025]
In addition, by supplying air from below the first carrier filling unit 21, the treated sewage in the first carrier filling unit 21 receives an upward flow of air, whereby the first carrier filling unit 21 receives the treated sewage. An upward flow is formed, and a downward flow of the sewage to be treated is formed in the second carrier filling portion 22. And the flow of the to-be-processed wastewater clockwise as shown by the arrow in FIG. 3 (clockwise direction in FIG. 3), so-called large swirl flow is formed. The granular carrier C1 of the first carrier filling portion 21 receives an upward flow and the granular carrier C2 of the second carrier filling portion 22 receives a downward flow along with the large swirling flow of the wastewater to be treated. Thereby, the granular carrier C2 of the second carrier filling portion 22 is shifted to the first carrier filling portion 21 side via the communication port 11, and the first carrier filling portion 21 is filled with the granular carrier to the height L1. And migrate. The organic pollutants in the treated sewage are subjected to aerobic treatment by the aerobic microorganisms deposited on the granular carrier C1 of the first carrier filling unit 21, and sludge and the like are generated in the first carrier filling unit 21. The sludge and the like flow into the second carrier filling unit 22 by the upward flow of the sewage to be treated, and gradually accumulate in the space above the second carrier filling unit 22. Thus, the deposition layer S is formed in the second carrier filling portion 22 by the filtering action of the granular carrier C2.
[0026]
When the normal operation ends, the backwash operation is performed next. In this backwash operation, air is supplied from the air diffuser 32a to the second carrier filling unit 22 by operating the second air diffuser 32 as shown in FIG. That is, the second air diffuser 32 is used for backwash processing. As a result, the wastewater to be treated in the second carrier filling unit 22 receives an upward flow of air, an upward flow of the wastewater to be treated is formed in the second carrier filling unit 22, and the wastewater to be treated in the first carrier filling unit 21. A downward flow of treated sewage is formed. And the big swirl | vortex flow of to-be-processed sewage counterclockwise as shown by the arrow in FIG. 4 (counterclockwise direction in FIG. 4) is formed. At this time, the granular carrier C1 of the first carrier filling part 21 is shifted to the second carrier filling part 22 side via the communication port 11 and fluidized in the second carrier filling part 22. Due to this fluidization, sludge and the like trapped on the granular carrier C2 of the second carrier filling part 22 is peeled off, and the backwash water containing the deposited layer S and other sludge is contaminated from the tank body 12 through the circulation path 15. It is extracted to the removal tank 1.
[0027]
A part of the air from the air diffuser 32 a is supplied to the communication port 11 and the first carrier filling unit 21, and an upward air flow is imparted to a part of the treated sewage in the first carrier filling unit 21. Thereby, for example, a circulating flow (small swirl flow) as shown in FIG. 4 is formed in the first carrier filling portion 21, and fluidization of the granular carrier particularly in the vicinity of the communication port 11 occurs. Therefore, it is possible to prevent the granular carrier from being formed in the vicinity of the communication port 11 and smooth the movement of the granular carrier. In addition, by forming a small swirl flow in the first carrier filling portion 21, the granular carrier that has not moved to the second carrier filling portion 22 is fluidized, and the granular carrier C1 of the first carrier filling portion 21 is also reversed. Can be washed. Therefore, the backwash efficiency is increased. When the backwash operation is completed, normal operation is resumed again as necessary.
[0028]
In this backwash operation, the air supplied from the diffusing pipe 32a to the first carrier filling unit 21 is sufficient to fluidize the granular carrier C1 of the first carrier filling unit 21, and the diffusing pipe It is set to be smaller than the air flow rate supplied from 31a. Thereby, it can be avoided that the capacity of the blower of the second air diffuser 32 becomes unnecessarily large. Further, when air is supplied from the air diffuser 31a to the first carrier filling portion 21 (aerobic treatment region), air is not supplied to the granular carrier at the communication port 11 from the air diffuser 32a, so the air is inadvertently second. It can be avoided as much as possible that it flows into the carrier filling part 22 (filtration region) and hinders filtration.
[0029]
According to the present embodiment configured as described above, in the process in which the granular carrier moves from the aerobic treatment region to the filtration region during the backwash process, communication is performed by the air flow from the air diffuser 32a of the second air diffuser 32. It is possible to prevent the stationary region of the granular carrier from being formed in the vicinity of the mouth 11 and maintain the smooth movement of the granular carrier.
Moreover, according to this Embodiment, the back washing process of the 1st support | carrier filling part 21 (aerobic process area | region) and the 2nd support | carrier filling part 22 (filtration area | region) are carried out by the diffuser tube 32a of the 2nd diffuser 32. Therefore, the backwashing efficiency can be increased. In addition, the blower of the second air diffuser 32 can be miniaturized as much as possible.
In addition, according to the present embodiment, since the air diffuser 32a having the location for supplying air to the second carrier filling portion 22 and the location for supplying air to the communication port 11 and the first carrier filling portion 21 is provided, The configuration of the diffuser can be simplified.
[0030]
In addition, this invention is not limited only to said embodiment, A various application and deformation | transformation can be considered.
[0031]
In the above embodiment, the backwashing diffuser 32 a has a location for supplying air to the second carrier filling portion 22 and a location for supplying air to the communication port 11 and the first carrier filling portion 21. However, it is also possible to configure each part with a separate air diffuser.
Moreover, although the case where the air diffusion tube 31a for aerobic treatment and the air diffusion tube 32a for backwashing processing were provided separately was described, the air diffusion tube 31a and the air diffusion tube 32a can be configured integrally. In this case, one diffuser can be divided into an aerobic treatment side and a backwash treatment side. If comprised in this way, the structure of a diffuser can be simplified more.
[0032]
Moreover, in the said embodiment, by supplying air to the 1st support | carrier filling part 21 (aerobic process area | region) with an air diffuser, the 1st support | carrier filling part 21 (aerobic process area | region) and a 2nd support | carrier filling part Although the case where to-be-processed sewage is circulated between 22 (filtration area | region) was described, the means to circulate to-be-processed sewage is not limited to this, It can change variously as needed. For example, a circulation line may be provided in the tank body 12 and the wastewater to be treated in the tank body 12 may be circulated by a pump or the like.
[0033]
【The invention's effect】
As described above, according to the present invention, in a sewage treatment apparatus in which a carrier on which microorganisms are implanted is movably filled in a treatment tank, the treatment efficiency is improved by facilitating the movement of the carrier. Reasonable 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 diagram of a carrier flow biological filtration tank 10. FIG.
FIG. 3 is a schematic diagram of the carrier fluid biological filtration tank 10 and shows a state during normal operation.
FIG. 4 is a schematic diagram of the carrier fluid biological filtration tank 10 and shows a state during a backwash operation.
[Explanation of symbols]
10 ... Carrier fluid biological filtration tank (treatment tank)
11. Communication port (communication part)
DESCRIPTION OF SYMBOLS 12 ... Tank main body 17 ... Partition 18 ... Upper porous member 19 ... Lower porous member 20 ... Carrier filling area | region 21 ... 1st carrier filling part 22 ... 2nd carrier filling part 31 ... 1st air diffuser 32 ... 2nd air diffuser 31a, 32a ... Air diffuser C, C1, C2 ... Granular support S ... Deposited layer

Claims (6)

A treatment tank filled with a carrier on which microorganisms are implanted, a biological treatment area for biological treatment of wastewater to be treated by the microorganisms, a filtration area for filtering an object to be filtered, and the biological treatment inside the treatment tank A partition partitioning the region into the filtration region, a communication portion communicating between the regions, a first air diffuser for supplying air to the biological treatment region, and a second for supplying air to the filtration region And a diffuser of
When air is supplied from one of the first air diffuser and the second air diffuser, the wastewater to be treated in the tank is circulated by the upward flow of the air, A sewage treatment apparatus configured to move a carrier through the communication part,
The communication part is provided at the lower part of the partition wall, and a third air diffusion part protruding toward the biological treatment region through a point immediately below the partition wall is provided,
Further, when the air is supplied from the second diffuser portion, the third by the spraying component, sewage treatment apparatus is characterized in that the arrangement for supplying air to the carrier before Killen communicating portion . The sewage treatment apparatus according to claim 1,
The third air diffuser can fluidize the carrier in the biological treatment area and supply air having a smaller flow rate than the first air diffuser to the communication part and the biological treatment area. An apparatus for treating sewage characterized by being configured. The sewage treatment apparatus according to claim 1 or 2,
The sewage treatment apparatus, wherein the second air diffuser and the third air diffuser are integrally formed. A treatment tank filled with a carrier on which microorganisms are implanted, a biological treatment area for biological treatment of wastewater to be treated by the microorganisms, a filtration area for filtering an object to be filtered, and the biological treatment inside the treatment tank A partition partitioning the region into the filtration region, a communication portion communicating between the regions, a first air diffuser for supplying air to the biological treatment region, and a second for supplying air to the filtration region provided and spraying component of,
Providing the communication part at the lower part of the partition, and providing a third air diffuser projecting toward the biological treatment region through a point directly below the partition;
In the first treatment step, air is supplied from the first air diffuser, the wastewater to be treated in the tank is circulated by the upward flow of the air, and a part of the carrier in the filtration region is passed through the communication part. Moving to the biological treatment area side, biologically treating the wastewater to be treated by microorganisms in the biological treatment area, filtering the matter to be filtered by the remaining carrier in the filtration area,
In the second treatment step, air is supplied from the second and third air diffusers, the wastewater to be treated in the tank is circulated by the upward flow of the air, and the carrier in the biological treatment area is connected to the communication part. A method for treating sewage, wherein the substrate is moved to the filtration region side through fluidizing, the carrier in the filtration region is fluidized, the material to be filtered is peeled off from the carrier, and the material to be filtered is extracted from the treatment tank. A method for treating sewage according to claim 4,
In the second treatment process, the third air diffuser can fluidize the carrier in the biological treatment region, and air having a smaller flow rate than the first air diffuser is used for the communication part and the organism. A method for treating sewage, comprising supplying to a treatment area, fluidizing the carrier in the biological treatment area, peeling the substance to be filtered from the carrier, and extracting the substance to be filtered from the treatment tank. A method for treating sewage according to claim 4 or 5,
The method for treating sewage, wherein the second air diffuser and the third air diffuser are integrally formed.

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