JP3701134B2 - Septic tank and its repair method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention contains a carrier that is formed so as to be able to flow together with the water to be treated in a state where microorganisms are supported, and is provided in a carrier flow tank provided with an air diffuser for flowing the carrier by supplying bubbles. The present invention relates to a septic tank provided with a carrier holding member for preventing outflow to the outside of the carrier fluid tank and a repair method thereof.
[0002]
[Prior art]
Conventionally, such septic tanks are assumed to be used in various environments, and have various configurations in order to exhibit stable water treatment performance even with respect to peak inflow where a large amount of water to be treated flows at a time. Is adopted. For example, the carrier accommodated in the carrier fluidization tank flows out of the carrier fluidization tank as the water level rises in the event of an abnormality or emergency, especially when there is a large peak inflow. At the same time, it is assumed that the function of purifying water to be treated by microorganisms is impaired. Therefore, in order to avoid such a situation, the carrier holding member is employed in the carrier flow tank.
Even if the carrier is pushed upward along with the rise of the water level in the carrier flow tank due to the peak inflow at the time of the abnormality or the like, such a carrier holding member is not allowed to move beyond the peripheral wall of the carrier flow tank. Usually, it was provided over the entire upper surface of the carrier flow tank so that it can be reliably prevented from advancing to the tank. In addition, this carrier holding member is usually formed of a net-like or lattice-like member and prevents passage of the carrier not only from the lower side to the upper side but also from the upper side to the lower side. In order to perform operations such as charging and replenishing the carrier into the carrier fluidized tank at the time of maintenance or exchanging the carrier from the carrier fluidized tank, the carrier fluidized tank is dismantled each time, There has been a situation in which a carrier loading portion through which the carrier can pass is formed from the upper side to the lower side of the carrier holding member. Further, in order to restore the initial function, an operation such as attaching and fixing the carrier holding member is necessary.
[0003]
[Problems to be solved by the invention]
By the way, the septic tank is generally buried in the ground, and is arranged in a situation where various internal inspection work must be performed overlooking the internal structure from the manhole. In such a case, the difference in height from the manhole to the carrier holding member is not only the distance from the manhole of the septic tank body to the carrier holding member but also the distance from the ground to the manhole of the septic tank body. Therefore, for example, it is forced to work in a dark place more than 1 m from an 80 cm manhole, and it is very difficult for a person to perform maintenance work through the manhole.
[0004]
Further, after performing such work, if it is attempted to restore the original function of the septic tank, the assembly work is performed contrary to the dismantling work, which may increase the difficulty.
[0005]
Accordingly, an object of the present invention is to provide a septic tank and a septic tank repair method that can facilitate the insertion and removal of the carrier into the carrier fluid tank when performing maintenance work on the septic tank.
[0006]
[Means for Solving the Problems]
The characteristic configuration of the septic tank of the present invention for achieving the above object is that an air diffuser that accommodates a carrier that is formed so as to be able to flow together with water to be treated in a state where microorganisms are supported, and causes the carrier to flow by supplying bubbles. A carrier holding member for preventing the carrier from flowing out of the carrier fluidized tank, a manhole provided above the carrier fluidized tank, and an upper side of the carrier fluidized tank. An opening for allowing the carrier to be inserted into and removed from the carrier flow tank is provided in a part of the carrier holding member and in the vicinity of the manhole, and the opening can be opened and closed by using the opening as a carrier loading part. In order to achieve the above object, the septic tank repair method according to the present invention is characterized in that the water level in the carrier fluidization tank extends to below the carrier holding member. Reduce In the state, a part of the carrier holding member is opened in the vicinity of the manhole to form a carrier charging part, and after the carrier charging part can be replenished and replaced, the carrier charging part can be refilled. In this case, an outflow prevention member is attached to the portion so that the carrier loading portion can be opened and closed.
[0007]
[Function and effect]
In other words, when the carrier holding member is provided in the carrier fluid tank, an opening is formed in the carrier charging part, and an opening / closing mechanism is provided that allows the carrier charging part to be opened and closed. If the mechanism is in a closed state, the carrier holding member can exhibit a carrier outflow prevention function, and at the time of maintenance, the water level of the carrier flow tank is lowered to make the carrier holding member higher than the water level, etc. When the opening / closing mechanism is opened, an opening can be formed in the carrier holding member, and the carrier in the carrier flow tank can be taken in and out. Further, when performing this loading / unloading operation, since the carrier holding member is not significantly disassembled, maintenance work can be easily performed.
[0008]
Therefore, the labor required for maintenance can be greatly reduced by simply changing the configuration, and a septic tank suitable for long-term use can be provided.
[0009]
Moreover, since the septic tank of such a structure changes a part of structure of the above-mentioned conventional septic tank, it can change a structure easily when maintaining the conventional septic tank. For this reason, when maintaining a conventional septic tank, first, an opening is formed in the carrier holding member by using a hole saw (round hole punching machine), a jigsaw (square hole punching machine) or the like, and a carrier input part is provided. By providing an outflow prevention member that prevents the carrier from flowing out in the input part, the above-mentioned maintenance work procedure can be performed, so that the work in a narrow space is reduced and maintenance is easily performed compared to the conventional method of disassembling the carrier holding member. However, the maintenance of the septic tank is not hindered, and maintenance can be facilitated when performing maintenance again.
[0010]
As the outflow prevention member, in addition to a lid member and a plug for covering the carrier charging portion, a duct-shaped member extending upward from the carrier charging portion, and the duct-shaped member and the lid member, plug It may be a combination.
[0011]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
(1)
As shown in FIGS. 1 and 2, the septic tank of the present invention comprises an anaerobic treatment tank N, an aerobic treatment tank E, treated water tanks T1, T2, and the like from the upstream side. It consists of one chamber N1 and an anaerobic filter bed tank second chamber N2, and the aerobic treatment tank E consists of a carrier flow tank E1 and a filtration tank E2. The raw water to be treated flows into the first anaerobic filter bed tank N1 from the raw water inflow section I, and downstream in the order of the anaerobic filter bed tank second chamber N2, the carrier flow tank E1, the filter tank E2, and the settling tank T2. It is decomposed while being transferred to the tank, and after passing through the disinfection tank Q provided above the treated water tank T2, it is discharged from the outlet Z to the outside of the tank.
[0012]
The anaerobic filter bed first chamber N1 is configured to be capable of storing raw water to be treated, and is capable of growing anaerobic microorganisms therein. The raw water to be treated flowing into the first anaerobic filter bed first chamber N1 is stored in the first anaerobic filter bed first chamber N1 and is anaerobically decomposed, mainly to divide coarse organic matter. And transferred from the lower part of the first anaerobic filter bed tank N1 to the lower part of the second chamber N2 of the anaerobic filter bed tank. Solids such as sludge that are not easily decomposed are stored as precipitates in the lower part of the anaerobic filter bed first chamber N1 or as scum in the upper part of the anaerobic filter bed first chamber N1.
The anaerobic filter bed second chamber N2 is provided with an anaerobic filter bed F, and anaerobic microorganisms are fixed and grown on the anaerobic filter bed F. The water to be treated which has flowed into the second chamber N2 of the anaerobic filter bed is further subjected to anaerobic treatment, decomposed to a state having almost no solid matter, and then sent to the carrier flow tank E1 by overflow. Between the anaerobic filter bed tank N and the carrier fluidized tank E1, the overflow portion 1 is configured to allow free movement of the treated water, and the overflow portion 1 is provided with a slit-like portion 2 to provide the treated water. The carrier and sludge in the carrier fluid tank E1 can be prevented from flowing back.
[0013]
The carrier fluid tank E1 accommodates and holds a carrier C1 that is formed so as to be able to flow together with the water to be treated in a state where microorganisms are supported, and is provided with an air diffuser D1 that allows the carrier to flow by supplying bubbles. An air diffuser is provided to allow the carrier C1 to flow in the carrier flow tank E1 by supplying bubbles from the air diffuser D1. With such a configuration, the water to be treated flowing into the carrier fluid tank E1 is purified by aerobic decomposition by aerobic microorganisms. The treated water that has undergone such treatment is transferred to the filtration tank E2 through the transfer wall portion 3 provided in the first partition wall W1 that partitions the carrier flow tank E1 and the adjacent filtration tank E2.
The advection wall portion 3 is formed in a lattice shape or a slit shape, and is configured to prevent the advancing of the carrier but to permit the advancing of sludge and water to be treated.
[0014]
The filtration tank E2 is configured by filling a carrier C2 having a specific gravity greater than that of water to a predetermined height at a high density. Moreover, the filtration wall part which distribute | circulates to-be-processed water freely in the position lower than the said predetermined height of the 2nd partition W2 which separates the said filtration tank E2 and the said treated water tank T1 provided adjacent to the said filtration tank E2. 4 is formed. As a result, the water to be treated containing sludge that is transferred to the filtration tank E2 is filtered through the deposited filtration layer B on which the carrier C2 is deposited, so that the solid water is hardly contained, and the adjacent treatment is performed. It is transferred to the water tank T1. The second partition wall W2 is connected to the septic tank side wall at the upper end, and the treated water tank T1 is arranged to be hidden under the filtration tank E2 in a plan view.
The filtration wall portion 4 is formed in a lattice shape or a slit shape, and prevents the advancing of the carrier C2, but allows the advancing of sludge and water to be treated.
Furthermore, an aeration pipe D2 as a stirrer for agitating the inside of the filtration tank E2 by agitating the carrier C2 is provided below the constructed filtration layer B, and the load on the septic tank such as at night is reduced. In the time zone when there is little inflow, the carrier is regenerated by performing aeration from the diffusion tube D2.
In addition, air diffuses toward the advection wall portion 3 in the aeration tube D2, and bubbles due to the aeration pass through the advection wall portion 3, and along the advection wall portion 3 on the carrier flow tank E1 side. The advection wall diffuser Da configured to be raised, and similarly diffused toward the filtration wall, and air bubbles due to the aeration pass through the filtration wall 4 and the treatment water tank T1 side As the structure which provides the filtration wall part aeration part Db comprised so that it can be raised along the filtration wall part 4, and wash | cleans the advection wall part 3 and the filtration wall part 4, respectively, and prevents clogging etc. is there.
[0015]
Here, the advection wall part 3 and the filtration wall part 4 have a predetermined upper end height of the deposition filtration layer B so that the water to be treated must be allowed to flow after passing a predetermined distance of the deposition filtration layer B. What is necessary is just the structure which is provided in the position lower than height, accept | permits the advection of to-be-processed water, and enables filtration of the to-be-processed water in the said deposition filtration layer B.
The carriers C1 and C2 are each formed to have a specific gravity of 1 or more and 1.2 or less that can flow together with the water to be treated.
[0016]
Further, as shown in FIGS. 2 and 3, the treated water tank T1 is provided with an air lift pump A for transferring the treated water to the anaerobic filter bed first chamber N1, which is generated by the regeneration of the carrier C2. The sludge can be transferred from the filtration tank E2 to the anaerobic filter bed tank first chamber N1 together with the water to be treated.
[0017]
Further, even if a large amount of water to be treated flows into the septic tank slightly below the steady water level of the carrier fluid tank E1 and the filtration tank E2, the carrier C1 in the tank is prevented from flowing out to other tanks. The carrier holding member 10 is composed of mesh members 11 and 11 having finer meshes than the carriers C1 and C2, and is bonded and fixed to the peripheral wall or partition wall of the septic tank. In addition, the carrier holding member 10 is provided with an opening 12 in a part thereof, and an opening / closing mechanism is formed by attaching the opening / closing freely with an openable / closable lid member 13 a as an outflow prevention member 13.
Thereby, even if it diffuses in the said carrier flow tank E1 and the filtration tank E2 and forms the convection of to-be-processed water, the flow is formed so that it may flow smoothly, without being inhibited by the said carrier holding member 10. The In addition, when the carriers C1 and C2 are filled in the carrier flow tank E1 and the filtration tank E2 or the carriers C1 and C2 are exchanged, the water to be treated is drawn out and the water level is lowered, and then the opening 12 Is used as a carrier loading part, and the carrier can be easily loaded and sucked, so that it can be easily maintained.
[0018]
Further, the carrier holding member 10 is provided with a diffuser tube insertion hole 14 that allows the diffuser tube D1 to be inserted and removed, and the air supply tube D1a connected to the diffuser tube D1 includes the diffuser tube D1. Is fixed in the carrier flow tank E1, and an outflow prevention member 15 that covers the diffuser tube insertion hole 14 is integrally connected to prevent a carrier from flowing out. The air diffusion pipe D1 and the air supply pipe for the air lift pump A are gathered in the upper space of the filtration tank, and the upper pipe of the carrier flow tank E1 is arranged to a minimum.
Thereby, even when it is necessary to take out the diffuser tube outside the septic tank, for example, when the diffuser tube D1 is maintained, the diffuser tube can be easily inserted / removed through the diffuser tube insertion hole 14, and the carrier The work can be performed with almost no disassembly of the holding member or the like.
[0019]
The treated water tank T1 allows only the clean supernatant that has passed through the filtration tank E2 to be discharged to the outside, flows into the disinfection tank Q provided at the upper part of the settling tank T2, and contacts the solid disinfectant Q1 to disinfect. After that, it is discharged out of the tank.
[0020]
As a result, the carrier fluid tank E1 and the filtration tank E2 are arranged so that the carrier can be easily exchanged from the upper space. Therefore, during maintenance, the septic tank can be placed in the septic tank without significantly decomposing the inside of the septic tank. It can be easily performed from the upper side through the provided manhole H.
[0021]
(2)
In the above configuration, an example in which a lid member as an outflow prevention member is provided in advance as an opening / closing mechanism of the carrier charging unit has been shown. However, when maintaining a conventional septic tank, the configuration is changed as follows: I can do it. Here, as shown in FIG. 4, the case where the carrier holding member of the septic tank is bonded and fixed to the entire upper surface of the carrier flow tank will be described as an example.
[0022]
First, the inflow of water to be treated into the septic tank is blocked, and the water level Wh in the carrier fluid tank is lowered.
Next, an opening is formed in the carrier holding member with a jigsaw. (See Fig. 5 (A))
Further, a duct member 13b as an outflow prevention member 13 is attached to the opening, and is opened in the vicinity of the manhole to form a carrier inlet. (See Fig. 5 (b))
In this state, the carrier in the carrier fluid tank can be easily inserted and removed through the carrier inlet, so that maintenance can be easily performed.
Further, the duct member 13b is configured such that the carrier can be reliably held in the carrier flow tank by detachably attaching a pressing member 13c for suppressing the penetration of the carrier into the duct.
As a result, this septic tank can be easily replenished and replaced by simply removing the pressing member attached to the duct member in the future maintenance, so that the configuration can be changed to a more preferable form. It will be.
[0023]
[Another embodiment]
In the previous embodiment, the structure in which the advection wall portion 3 and the filtration wall portion 4 are integrally formed with the first and second partition walls W1 and W2 is shown. The first and second partition walls W1 and W2 provided with the advection wall portion 3 or the filtration wall portion 4 may be detachably provided with respect to the septic tank. good. Moreover, although each aerobic processing tank E1, E2 was provided in parallel in the width direction in FIG. 1, the arrangement | sequence in planar view, such as providing in series in a longitudinal direction, is not restricted to the above-mentioned thing.
[0024]
The carrier holding member is provided slightly below the steady water level of the carrier fluid tank, but may be, for example, slightly above the steady water level. By adopting this configuration, the flow of water to be treated in the carrier flow tank is not hindered and becomes more efficient, and it is not necessary to lower the level of the water to be treated during maintenance, thereby reducing the labor required for maintenance. It is done.
[Brief description of the drawings]
FIG. 1 is a vertical side view of a septic tank according to the present invention. FIG. 2 is a perspective view of a main part of a septic tank according to the present invention. FIG. 3 is a vertical side view of a main part of a septic tank according to the present invention. Side view [Fig. 5] Process diagram for repairing a conventional septic tank by the septic tank repair method of the present invention [Explanation of symbols]
C1 Carrier D1 Air diffuser E1 Carrier fluid tank 10 Carrier holding member 13 Carrier inlet

Claims (2)

The carrier fluidized tank of the carrier is provided in a carrier fluidized tank that contains a carrier that is formed to be flowable together with the water to be treated in a state where microorganisms are supported, and is provided with an air diffuser that flows the carrier by supplying bubbles. A septic tank provided with a carrier holding member for preventing outflow to the outside, and provided with a manhole above the carrier flow tank,
An opening that allows the carrier to be inserted into and removed from the carrier fluid tank from above is provided in a part of the carrier holding member and in the vicinity of the manhole, and the opening is used as a carrier inlet. A septic tank in which an opening / closing mechanism that enables opening and closing of the carrier charging part is provided in the carrier charging part. The carrier fluidized tank of the carrier is provided in a carrier fluidized tank that contains a carrier that is formed to be flowable together with the water to be treated in a state where microorganisms are supported, and is provided with an air diffuser that flows the carrier by supplying bubbles. A method for repairing a septic tank in which a carrier holding member for preventing outflow to the outside is provided , and a manhole is provided above the carrier flow tank ,
In the state where the water level in the carrier flow tank is lowered to below the carrier holding member, a part of the carrier holding member is opened in the vicinity of the manhole to form a carrier charging part, and the carrier flow from the carrier charging part A method for repairing a septic tank, in which after the carrier in the tank is replenished and exchanged, an outflow prevention member for preventing the carrier from flowing out is attached to the carrier input portion.

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