JP3907396B2 - Septic tank - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention comprises a carrier fluid tank that contains a carrier that is formed to be flowable together with the water to be treated in a state where microorganisms are carried, and is provided with an air diffuser that causes the carrier to flow by supplying bubbles.
The air diffuser is held in an upright position in the carrier flow tank, and an air supply pipe that ventilates the inside and can be supplied downward is held in a horizontal position in the carrier flow tank. It is composed of an air diffuser that receives supplied air and diffuses into the carrier fluid tank,
The present invention relates to a septic tank in which an outflow prevention member for preventing the carrier from flowing out of the carrier fluid tank is provided at a position higher than the steady water level of the water to be treated in the carrier fluid tank.
[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 fluidized tank flows out of the carrier fluidized tank as the water level rises, especially when there is a large peak inflow in an abnormal or emergency situation. Since it is assumed that the function of purifying the water to be treated by microorganisms is impaired, in order to avoid such a situation, the outflow prevention member is employed in the carrier flow tank. It is. In addition, as shown in FIG. 4, such an outflow prevention member is used for the purpose of maintaining the predetermined microbial growth environment in order to keep the packing density of the carrier constant regardless of the water level in the carrier flow tank. It was set below the water level of the to-be-processed water in a tank, and it was set as the structure which restrict | limits the area | region where the said carrier is flowed to the predetermined range.
[0003]
However, with such a configuration, the concentration of the microorganisms dispersed in the water to be treated is maintained almost constant throughout the situation where the water to be treated flows into the septic tank under various conditions. Although it should be possible to exhibit the processing capability, it has become clear that in practice, there may be cases where uneven growth of microorganisms or the like occurs, and stable treatment may become difficult in the long term.
[0004]
The above-mentioned uneven growth of microorganisms and the like may occur based on the fact that the flow of water to be treated in the carrier flow tank is not constant depending on the place in the tank, and unevenness occurs in the oxygen supply amount and the density of microorganisms. If it examines based on the empirical rule, it is mentioned as one of the big causes that the said outflow prevention member has prevented the flow through which the to-be-processed water circulates.
[0005]
That is, if the outflow prevention member is provided below the water level of the carrier flow tank, the flow of the treated water is hindered by the outflow prevention member, the flow of the treated water is biased, and the water to be treated is retained in places. Occurs, leading to uneven treatment of the water to be treated.
[0006]
In such a situation, the outflow prevention member normally allows the water to be treated to flow, and is easily formed by being provided in a net shape or a slit shape to prevent the carrier from moving. is there.
[0007]
Therefore, a septic tank in which the outflow prevention member is provided at a position higher than the steady water level of the carrier flow tank has been proposed (see Japanese Patent Application No. 11-017246). The treated water in the carrier fluidized tank is easily moved in the horizontal direction without being disturbed after reaching the water surface due to the diffused air from the diffuser. It is considered that convection over the entire carrier fluidized tank is easily formed in the carrier fluidized tank, and as a result, good water treatment becomes possible.
Further, even if such an outflow prevention member is provided at a position higher than the steady water level of the carrier flow tank, it can function to prevent the carrier from flowing out when the water level rises during the peak inflow. . Furthermore, in order to exhibit such a function, it is usually not necessary to provide a member to be immersed in the water to be treated in addition to the carrier, so that the circulation of the water to be treated is well maintained. It is expected.
Accordingly, the carrier flow tank is a septic tank that can easily maintain a function of efficiently decomposing the water to be treated by supplying air with a high concentration of microorganisms and stably exhibiting a high treatment capacity over a long period of time. It is thought that it will be possible to provide
[0008]
However, in the configuration as described above, the fact that the outflow prevention member is disposed at a position higher than the water surface means that the liquid level in the tank becomes difficult to see directly from above the carrier flow tank of the septic tank. Problems arise.
[0009]
In other words, since the liquid level in the carrier flow tank is not directly visible, check the properties of the water to be treated, check the clogging state of the diffuser, and maintain a good diffused state for a long time. In this case, it is necessary to easily configure the water to be treated in the tank. For this purpose, an openable and closable opening is provided in the outflow prevention member so that the carrier can be exchanged or added in order to compensate for the collection of water to be treated and the wear of the carrier in the tank. Is considered. In addition, when adopting a configuration capable of exchanging or adding the carrier, a duct portion extending above the opening is provided, and a person works as much as possible in the septic tank. It is also considered that the configuration can avoid this.
[0010]
Further, as a configuration that allows the air diffuser to be suitably inspected, an insertion hole that allows the air diffuser to be inserted and removed is provided in the outflow prevention member, and the air diffuser is disposed in the carrier flow tank. The air supply pipe that is held in a standing position and is vented to the inside and freely supplied downward, and is held in a horizontal position in the carrier flow tank, and receives the air supplied from the air supply pipe and receives the air supplied from the air supply pipe. It consists of a diffusing pipe which aeration within the carrier through the through hole so as to cover the insertion hole configuration is provided integrally is disclosed a lid member which allows preventing the Ru and out squirrel to said supply pipe ing.
[0011]
According to such a configuration, when the air diffuser is inspected, if the air supply pipe is gripped, the air diffuser can be pulled out integrally and taken out of the septic tank. After checking the air portion, it is considered suitable because it can be easily fixed simply by inserting it into the carrier flow tank again and locking the lid member to the outflow prevention member.
[0012]
[Problems to be solved by the invention]
However, if the lid member is fixed to the air supply pipe, it can be handled integrally when checking the entire diffuser, and positioning is easy even when it is fixed again. Although there is an advantage that it can be done, there is a problem that it is bulky and difficult to handle in a narrow tank, and it cannot be said that workability is necessarily improved.
In addition, in the case where the above-described opening is provided so that the water to be treated can be collected, the water to be treated can be collected from the opening, but a duct is used so that the opening is mainly used for insertion / removal of the carrier. In the case where it is extended, it is still difficult to collect the water to be treated from the opening, and a separate measure is required.
[0013]
Therefore, an object of the present invention is to provide a septic tank that can easily perform maintenance work for water quality inspection in the carrier flow tank while facilitating maintenance of the air diffuser.
[0014]
[Means for Solving the Problems]
In order to achieve the above object, the characteristic configuration of the present invention includes an air diffuser that accommodates 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 that causes the carrier to flow by supplying bubbles. Provided with a carrier flow tank,
The air diffuser is held in an upright position in the carrier flow tank, and an air supply pipe that ventilates the inside and can be supplied downward is held in a horizontal position in the carrier flow tank. It is composed of an air diffuser that receives supplied air and diffuses into the carrier fluid tank,
A septic tank in which an outflow prevention member for preventing the carrier from flowing out of the carrier fluidized tank is provided at a position higher than the steady water level of the water to be treated in the carrier fluidized tank,
In the outflow prevention member, while forming an insertion hole that allows the air diffuser to be inserted into and removed from the carrier flow tank, a lid member that covers the insertion hole is provided, and each of the air supply pipe and the lid member includes: By providing engagement portions that can be engaged with each other, an attachment portion that can be detachably attached to the air supply pipe is configured, and the engagement portions are engaged with each other, It said insertion hole by placing in a state of the lid performs positioning of the diffuser tubes provided continuously to said air charge, and prevents possible to the point that is to form the shape of the said carrier and out through the insertion hole It is in.
[0015]
[Function and effect]
The present inventors pay attention to the fact that the insertion hole is not effectively used in applications other than the insertion / removal of the air diffuser in the configuration of the above-described conventional septic tank, and effectively uses the insertion hole. Thus, the present inventors have thought that the above object can be achieved, and have arrived at the present invention.
That is, when an insertion hole is formed in the outflow prevention member so that the air diffuser can be inserted into and removed from the carrier flow tank, the air diffuser is taken out of the tank as described in the prior art. Make maintenance possible.
If a lid member that covers the insertion hole is provided, the lid member covers the insertion hole and prevents the carrier from entering and exiting through the insertion hole with the lid member attached to the air supply pipe. By making it possible, it is possible to prevent the carrier in the carrier flow tank from flowing out to other tanks at the time of peak inflow and the like, and the lid member is detachable from the air supply pipe If the air diffuser is taken out of the tank for maintenance, it can be handled with the lid member detached from the air supply pipe. It can be handled easily without being bulky. In addition, by forming the upper and lower positions of the air diffuser so that they can be freely positioned, it is possible to accurately position the air diffuser during insertion / removal operation, and the detached lid member is attached to the air supply pipe. It is possible to form a state in which the insertion hole is securely covered and covered in the attached state.
[0016]
On the other hand, when the operator simply wants to inspect the water quality in the carrier flow tank and the state of the carrier, the operator simply removes the lid member from the air supply pipe, and removes the diffuser part to the outflow prevention member. An opening can be formed, and the water to be treated and the carrier in the carrier flow tank can be collected and inspected through the opening, and the lid member also prevents the outflow during the inspection. The work can be performed while being placed on the member. In addition, even when recovering from the working state, the lid member is simply attached to the attachment portion with respect to the air supply pipe, and the insertion hole is covered while the diffuser portion is positioned at the original position. Since it can be arranged in a state, it is possible to realize the same workability as that provided by using an opening in the outflow prevention member separately from the insertion hole in the related art, and a duct in the conventional opening. In the case where it was provided, the workability was greatly reduced, but the workability was not lowered, and when the lid member was integrally provided in the conventional air diffuser, the insertion hole was not provided. Even if it is assumed to be used, the lid member is configured to be easily moved, so that it does not interfere with the work and the information can be opened in a form that allows easy use of the insertion hole. Excellent.
[0017]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
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 treated water tank T1. 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.
[0018]
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. Further, 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.
[0019]
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.
[0020]
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 advection of the carrier C1, but to permit the advection of sludge and water to be treated.
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.
[0021]
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 stirring device 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.
[0022]
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.
[0023]
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. FIG.
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.
[0024]
Further, 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, and the sludge generated by the regeneration of the carrier C2 is collected from the filtration tank E2 into the treated water tank T1. It can be transferred to the first chamber N1 of the anaerobic filter bed tank together with the water to be treated.
Moreover, even if a large amount of water to be treated flows into the septic tank above the steady water level of the carrier fluid tank E1 and the filtration tank E2, the outflow is prevented so that the carrier in the tank does not flow out to other tanks. The prevention member 10 is composed of mesh members 11 and 11 having finer meshes than the carriers C1 and C2, and can be divided into a plurality of parts and taken out from the manhole H. Further, the outflow prevention member 10 is provided with an opening 12 in a part thereof, and a duct-shaped carrier charging part 13 is extended.
[0025]
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 outflow prevention 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, they can be easily charged and taken out via the carrier loading unit 13. It becomes.
[0026]
Further, as shown in FIG. 3, the outflow prevention member 10 is provided with an insertion hole 14 of the diffusion tube D1 that allows the diffusion tube D1 to be inserted and removed, and the insertion hole 14 is covered with a lid member 15. Is possible. The air supply pipe D1a connected to the air diffusion pipe D1 and the lid member 15 are respectively provided with engaging portions D1b and 15a that can be engaged with each other, thereby constituting a detachable mounting portion. . By engaging the engaging portions D1b and 15a with each other and arranging the lid member 15 so as to cover the insertion hole 14, the diffuser pipe D1 is fixed in the carrier flow tank E1 , and the carrier A blocking mechanism for preventing the outflow is configured. 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.
The air diffusion pipe D1 and the air supply pipe D1a for supplying air to the air diffusion pipe are collectively referred to as an air diffusion portion.
[0027]
Thereby, not only when it is necessary to take out the diffuser pipe D1 to the outside of the septic tank, for example, when performing maintenance of the diffuser, but simply checking the quality of the water to be treated and the state of the carrier in the carrier flow tank E1. Even in this case, the air diffuser can be easily inserted / removed through the insertion hole 14, the water to be treated and the carrier can be collected, and the maintenance work can be performed without almost disassembling the outflow prevention member. Can be done. In addition, if the insertion hole is formed sufficiently large, maintenance work can be performed in a state where various measuring devices such as a DO sensor are brought into the septic tank without collecting the water to be treated in the carrier flow tank. Since it can be performed, workability can be further improved.
[0028]
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 disinfecting tank Q provided at the upper part of the treated water tank 2, and contacts the solid disinfectant Q1 to disinfect. After that, it is discharged out of the tank.
[0029]
As a result, the carrier fluid tank E1 and the filtration tank E2 are arranged in a state in which the upper side is provided in an open state and the carrier can be easily replaced and the water quality can be confirmed from the upper space. By simply removing the lid member from the air supply pipe without disassembling the inside of the septic tank, the insertion hole can be opened and can be easily performed from above via the manhole H provided in the septic tank. At this time, even when various measuring devices (pH meter, BOD meter, etc.) are brought into the tank for water quality inspection and the like, it is difficult to pay attention to handling and workability is improved.
[0030]
[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.
Moreover, although the said carrier injection | throwing-in part 13 is not essential, it is desirable to form in the duct shape to the vicinity of the said manhole H according to the embedding condition of the said septic tank.
[Brief description of the drawings]
FIG. 1 is a longitudinal side view of a septic tank according to the present invention. FIG. 2 is a perspective view of essential parts of the septic tank of the present invention. FIG. 3 is an explanatory view of lid members. ]
C1 Carrier D1 Air diffuser E1 Carrier fluid tank 10 Outflow prevention member 15 Lid member

Claims (1)

In a state where microorganisms are supported, a carrier fluid tank is provided that contains a carrier that is formed to be flowable together with the water to be treated, and is provided with an air diffuser that causes the carrier to flow by supplying bubbles.
The air diffuser is held in an upright position in the carrier flow tank, and an air supply pipe that is vented to the inside and can be supplied to the lower side, and is held in a horizontal position in the carrier flow tank, from the air supply pipe It is composed of an air diffuser that receives supplied air and diffuses into the carrier fluid tank,
A septic tank in which an outflow prevention member for preventing the carrier from flowing out of the carrier flow tank is provided at a position higher than the steady water level of the water to be treated in the carrier flow tank,
The outflow prevention member is provided with an insertion hole that allows the air diffuser to be inserted into and removed from the carrier flow tank, and a lid member that covers the insertion hole is provided, and each of the air supply pipe and the lid member includes By providing engagement portions that can be engaged with each other, an attachment portion that can be detachably attached to the air supply pipe is configured, and the engagement portions are engaged with each other, placing the state of the lid into the insertion hole, the air charge to perform positioning of the diffuser tubes provided continuously, and septic tank the carrier through the insertion hole are form shaped to be prevented from entering and leaving .

Images