JP2003094079A - Structure of drainage port for cleaned waste water, aerobic treatment vessel and sewage cleaning vessel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an aerobic treatment vessel in which an extra space part inside the vessel is eliminated and the size of the vessel is minimized while maintaining the same function. SOLUTION: The aerobic treatment vessel is arranged in upper and lower parts without providing a space part between the upper section (a biological reaction bed) 2 on the upper side and the lower section (a filtration bed) 3 on the lower side. In the lower part of the upper section (the biological reaction bed) 2, a diffusing member 5a for reaction is installed, and in the downward or the lower part of the lower section (the filtration bed) 3, a diffusing member 5b for cleaning is installed. In the lower part of the vessel, an opening part 12 for communicating with a treatment water storage part 13 is provided, and in the filtration bed 3, a drainage port 8 for cleaned waste water connected to a discharge pipe 7 for cleaned waste water is arranged. In a mouth part of drainage port 8, a water-permeable member 11 which allows liquid to pass through and does not allow a filler (filter medium) 10b to pass through is provided.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a structure of a cleaning drainage port, an aerobic treatment tank and a sewage purification tank.

[0002]

2. Description of the Related Art FIG. 4 shows an example of a conventional aerobic treatment tank (Japanese Unexamined Patent Publication No. 6-285484) which constitutes one tank in a sewage purification tank. The aerobic treatment tank (contact aeration tank) is composed of an upper section 2 filled with the granular carrier 10a and a lower section 3 filled with the granular carrier 10b.
A diffusing member 5a and a diffusing member 5b are provided below each of them, and a water-permeable plate-like member 4c which allows sewage (water to be treated) to pass directly above the diffusing member 5a but does not pass the granular carrier 10a. Is provided horizontally, and a water-permeable plate member 4d that allows sewage (water to be treated) to pass through but also the granular carrier 10b does not pass through the upper portion of the lower section 3 and horizontally communicates with the water-permeable plate member 4c. The cleaning drainage pipe 7 is connected to the space 9 between the aqueous plate-shaped material 4d so that the granular carriers 10a and 10b are not sucked into the cleaning drainage outlet 8.

[0003]

SUMMARY OF THE INVENTION An object of the present invention is to further improve the aerobic treatment tank, which eliminates an unnecessary space in the tank and maintains the same function. It is intended to provide an aerobic treatment tank whose size is as compact as possible.

[0004]

In order to achieve the above object, the structure of the cleaning and drainage outlet of the present invention has the following constitution. That is, the cleaning drainage outlet 8 of the present invention allows the liquid to pass through the cleaning drainage outlet 8 of the cleaning drainage pipe 7 provided so as to be connected to the filtration bed (lower section) 3 of the aerobic treatment tank 1. Is provided with a water-permeable member 11 that does not allow the filler (filter material) 10b to pass therethrough.

The present invention also provides an aerobic treatment tank having a cleaning / drainage outlet having the above structure, that is, a space between an upper upper section (bioreaction bed) 2 and a lower lower section (filtration bed) 3. The aerobic treatment tanks are arranged in the upper and lower sides without providing a section, and the reaction diffusion member 5a is installed in the lower part of the upper section (biological reaction bed) 2 and below the lower section (filtration bed) 3. Alternatively, the cleaning diffusion member 5b is installed in the lower part, and the opening 12 communicating with the treated water storage part 13 is provided in the lower part of the tank.
Is provided with a cleaning drainage outlet 8 connected to a cleaning drainage pipe 7, and a water-permeable member 11 that allows liquid to pass therethrough but does not pass a filler (filter material) 10b is provided at the mouth of the outlet 8. It is an aerobic filter bed tank.

Furthermore, the present invention also relates to a wastewater purification tank having the aerobic filter bed tank. As the sewage purification tank, there are a sewage purification tank including an anaerobic treatment tank first chamber, an anaerobic treatment tank second chamber, an aerobic treatment tank 1 and a disinfection tank in order from the upstream.

[0007]

The present invention will be described in more detail with reference to the accompanying drawings. FIG. 1 is an example of an aerobic treatment tank according to the present invention. The aerobic treatment tank 1 is composed of an upper compartment 2 filled with a filler (biological carrier) 10a and a lower compartment 3 filled with a filler (filter material) 10b, and is filled in an upper portion of the upper compartment 2 and a lower portion of the lower compartment 3. Water-permeable partition material 4 that does not allow materials 10a and 10b to pass through
a and 4b are provided respectively. The filler 10a is preferably a fluid filler having a specific gravity of approximately 0.9 to 1.1, and the filler 10b is preferably a sedimentary filler having a specific gravity of 1.0 or more. Further, a water-permeable partition material may be used in the boundary portion 4f between the upper section 2 and the lower section 3, but the filler material 10a may be used without using the water-permeable partition material.
The boundary may be formed by the difference in specific gravity between the filler and the filler 10b. Further, a reaction air diffusing member 5a is provided in the lower portion of the upper section 2 and directly above the boundary portion 4f, and a cleaning air diffusing member 5b is provided below the lower section 3 and immediately below the water permeable partition member 4b. At the same time, the cleaning drainage discharge pipe 7 is arranged so that the cleaning drainage outlet 8 is located above the lower section 3. Then, it is possible to return the cleaning drainage to the previous tank while drawing out the cleaning drainage via the transfer pump 6. Here, the upper section 2 mainly functions as an aerobic reaction section that oxidizes organic substances and nitrifies ammonia, and the lower section 3 mainly functions as a filtration section that captures suspended solids (SS).

2A and 2B are drawings of the cleaning drainage outlet part, wherein FIG. 2A is a front view and FIG. 2B is a bottom view. A water-permeable mesh member 11 that allows the liquid to pass therethrough but does not allow the filter medium 10b to pass through is fixed to the cleaning drainage outlet 8.

Instead of the mesh member, a perforated (perforated) water-permeable member 11 as shown in FIG. 3 may be used.
A water-permeable slit member (not shown) may be used.

During normal sewage treatment (during biological reaction), in order to aerobically treat sewage, air is constantly discharged from the reaction air diffuser 5a provided in the lower portion of the upper section 2.
At that time, the filler (biological carrier) 10a in the upper compartment 2 flows vertically due to the stirring effect of aeration. At this time, air may be discharged from the cleaning air diffuser 5b,
Normally, it is not ejected. In the upper section 2, oxidation / decomposition of organic matter and nitrification of ammonia mainly proceed.

At the time of normal sewage treatment (during biological reaction), in the lower compartment 3, the liquid advancing from the upper compartment 2 flows downward, and an aerobic reaction continues due to carry-over oxygen (dissolved oxygen) and a stationary state. The SS is efficiently captured (filtered) by the filler (filter material). The filtered liquid moves to the next tank through the opening 12, but the lower compartment 3 is gradually closed. To remove this blockage or remove accumulated sludge, wash regularly.

Next, the cleaning of the lower section 3 will be described.
First, air is diffused from the cleaning air diffuser 5b provided below the lower section 3. The filter medium 10b in the lower section 3 begins to flow due to the air bubbles generated by the air diffusion, and the trapped SS comes to be released. At this time, the transfer pump 6 connected to the cleaning drainage pipe 7 is operated to draw out the cleaning drainage containing SS from the cleaning drainage outlet 8. In this case, the liquid (water) for cleaning uses the liquid (water) in the treated water storage unit 13.

As another cleaning method, a cleaning drainage pipe 7 and a cleaning drainage outlet 8 are provided in the lower portion of the lower compartment 3,
Otherwise, the cleaning liquid (water) may be the liquid (water) on the upper side of the lower compartment 3 as in the above-described configuration.

[0014]

According to the aerobic treatment tank of the present invention, since the space is not provided between the upper compartment and the lower compartment, the tank can be made compact accordingly. The number of structural members can be reduced. further,
The position and height of the cleaning drainage outlet can be selected relatively freely. Since it can be placed close to the filtration bed, it can be efficiently washed.

[Brief description of drawings]

FIG. 1 is a schematic configuration diagram of an aerobic treatment tank according to an example of the present invention.

FIG. 2 is a front view and (b) a bottom view of the cleaning drainage port in the aerobic treatment tank of the present invention.

3A and 3B are other examples of the cleaning drainage port in the aerobic treatment tank of the present invention, in which FIG. 3A is a front view and FIG. 3B is a bottom view.

FIG. 4 is a schematic configuration diagram of a conventional aerobic treatment tank.

[Explanation of symbols]

1: Aerobic treatment tank 2: Upper compartment (biological reaction bed) 3: Lower compartment (filtration bed) 4a, 4b, 4c, 4d: Water-permeable partition material (water-permeable plate member) 4f: Upper compartment and lower compartment Boundary 5a: Air diffuser for reaction (air diffuser) 5b: Air diffuser for cleaning (air diffuser) 6: Transfer pump 7: Wash drainage discharge pipe 8: Wash drainage outlet 9: Spaces 10a, 10b: Filling Material (biological carrier, filter material) 11: Water-permeable member 12: Opening 13: Treated water storage

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Claims (3)

[Claims] 1. In a structure of a cleaning drainage outlet of a cleaning drainage pipe provided so as to be connected to a filtration bed of an aerobic treatment tank, a water-permeable member which allows liquid to pass but does not pass a filter medium is disposed in the outlet. The structure of the cleaning drain outlet that is used. 2. An aerobic treatment tank in which an upper biological reaction bed and a lower filtration bed are arranged one above the other, wherein a reaction air diffuser is installed in the lower portion of the biological reaction bed, A cleaning air diffuser is installed below or below the filtration bed, an opening communicating with the treated water storage is provided at the bottom of the tank, and a cleaning drainage outlet connected to the cleaning drainage pipe is provided on the filtration bed. And a water-permeable member that allows liquid to pass therethrough but does not pass a filter medium, is disposed in the cleaning drainage port. 3. A sewage purification tank comprising the aerobic filter tank according to claim 2.