JP3768054B2 - Septic tank partition wall structure - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
In the present invention, a plurality of water treatment tanks are arranged side by side, and an overflow portion for overflowing the water to be treated from the upstream tank to the downstream tank is provided in a partition wall that partitions the upstream tank and the downstream tank. The present invention relates to a partition wall structure of a septic tank.
[0002]
[Prior art]
Conventionally, the partition wall of the septic tank is formed with an opening at a predetermined position of the partition wall or a notch from the upper end side of the partition wall so that the steady water level of the upstream tank is located at the lower end. What is known.
In addition, a swing plate capable of closing the opening is provided in the opening to prevent backflow of the water to be treated from the downstream tank to the upstream tank, and the swing plate is connected to the downstream tank. swingably to the side, the opening in the swing posture overflow portion becomes an opening state is formed, the by Ri before SL on the upstream side tank opening peripheral portion covers the opening in the hanging position There are known ones that are configured to be restricted from swinging to the side.
[0003]
[Problems to be solved by the invention]
According to the structure of the partition wall of the former septic tank where the overflow part is formed simply by forming an opening as described above, when a large amount of raw water to be treated flows into the septic tank, it is regulated by the opening. The water level becomes higher than the water level to be treated, and the space in which the water to be treated circulates between the upstream side tank and the downstream side tank becomes large. Will occur.
[0004]
However, when there is a large inflow of water to be treated in this way, it is necessary to allow the inflow of water to be treated from the upstream side tank to the downstream side tank. In the case of an aerobic tank, the sludge is returned from the downstream tank to the upstream tank in large quantities because it is necessary to maintain the sludge concentration at a relatively high level. It is not preferable to perform the treatment water treatment stably, and it is necessary to suppress the backflow circulation of the sludge.
[0005]
Therefore, in order to prevent such a tendency, a configuration in which the swing plate is provided is adopted. However, in this case, even when a large amount of water to be treated is received, the advection of the water to be treated is In order to form the latter so as to occur from the upstream side tank toward the downstream side tank, the latter structure provided with the swing plate is considered. In such a case, the upstream side tank and the downstream side are considered. If the tank is maintained at a level that is slightly higher than the level regulated by the opening, the water to be treated cannot be steadily returned and transferred, An unfavorable situation is also assumed when performing biological treatment.
In addition, when a large amount of the water to be treated exceeds the maximum amount assumed at the time of design, a large amount of the water to be treated is directly affected by the downstream side tank. It is also necessary to buffer large inflows of treated water.
Therefore, an opening is provided in the partition wall, and the upstream tank and the downstream tank are simply partitioned in a state where they are at a steady water level, and water to be treated between the upstream tank and the downstream tank is configured. All the advection is borne by the treated water transfer means such as an air lift pump, and the upstream tank is configured to be able to temporarily store a large amount of treated water into the tank to buffer the adverse effects on the downstream tank. However, it has been studied to maintain the return of the sludge component from the downstream tank well, but the structure of the septic tank becomes complicated and the initial equipment cost is increased due to the provision of the treated water return means. There was an inconvenience that the operating cost was expensive.
[0006]
Therefore, in view of the above-mentioned drawbacks, the object of the present invention is to provide an ordinary tank while buffering in the upstream tank even when there is a large amount of water to be treated in the septic tank due to the improvement of the partition wall and a simple and inexpensive configuration. It is in the point which provides the septic tank which can perform the to-be-processed water treatment stable sometimes.
[0007]
[Means for Solving the Problems]
In order to achieve this object, the characteristic configuration of the partition wall structure of the septic tank of the present invention includes a plurality of water treatment tanks arranged side by side, and a partition wall that partitions an upstream tank and a downstream tank from the upstream tank to the partition wall. water to be treated on the downstream side tank a partition wall structure of the septic tank provided with an overflow section for overflow, the openings provided in the partition wall, swinging it has a narrow water passage opening than the opening A moving plate is provided, and the swing plate is swingably attached to the upstream tank side, and the opening portion is opened and an overflow portion is formed in the swinging posture, and at least the opening portion is formed in the hanging posture. together with part of the cover, the swing of the opening peripheral edge portion by Ri front Symbol downstream tank side is restricted, and the opening degree of the opening is restricted, the through water outlet is formed in the overflow portion Furthermore, when the water level of the upstream tank rises above the swing plate, the upstream side Lies in is formed an overflow section for overflow of the treated water into the downstream vessel from.
[0008]
[Function and effect]
In other words, a septic tank in which a plurality of water treatment tanks are arranged side by side, and an overflow section is provided on the partition wall that separates the upstream tank and the downstream tank from the upstream tank to overflow the treated water from the upstream tank. In this case, if an aeration device is provided in the downstream tank, the downstream tank can perform aerobic treatment of the water to be treated, and the generated sludge can be suspended in the upstream tank.
Here, if the partition wall is provided with an opening, natural advection of the water to be treated from the upstream side tank to the downstream side tank can be achieved, and the upstream side tank side is swingably attached, the opening is overflow portion is formed becomes the opening state, covers at least a portion of the opening in the hanging position, the swing of the opening peripheral edge portion by Ri front Symbol downstream tank side is restricted And if the opening degree of the said opening part is restrict | limited and the rocking | fluctuation plate is provided so that the said water flow opening may be formed in an overflow part, the water level of the said upstream tank is higher than the water level of the said downstream tank. The swinging plate is in a suspended position due to the difference in water head between the two tanks, and is pressed against the peripheral edge of the partition wall to cover the opening and the downstream side by the peripheral edge of the opening. Swinging to the tank side is restricted. At this time, when the water level of the upstream tank rises rapidly and reaches a higher water level than the upper end of the swing plate, the water to be treated above the upper end of the swing plate is swung. The upper side of the moving plate is transferred to the downstream tank as an overflow portion. Here, the treated water to be advected has a low normal load, so that the advection of the treated water with less load is promoted while relaxing the advection of the treated water that has been abundantly transferred. Processing can be optimized. In addition, even when the water level of the water to be treated in the upstream tank does not reach the upper end of the swing plate, if the water level is above the water inlet, an overflow portion is formed by the water inlet. become. Then, the opening is narrowed, and the treated water in the upstream side tank preferentially passes through the water flow port due to the difference in water head, so that the treated water is returned from the downstream side tank to the upstream side tank. While suppressing, the advection of the to-be-processed water from the said upstream tank can be aimed at.
That is, based on the relationship between the upstream tank and the downstream tank, the water to be treated is appropriately circulated, and the water quality released to the external environment can be further purified.
On the other hand, when the water level of the upstream tank becomes equal to the water level of the downstream tank, the two-way between the upstream tank and the downstream tank is accompanied by the swing of the swing plate. The situation where the advection of to-be-treated water tends to occur is created. Therefore, the return circulation of floating sludge can be efficiently carried out, and the efficiency of water treatment can be facilitated.
[0009]
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 includes an anaerobic treatment tank N, an aerobic treatment tank E, a treated water tank T1, and the like from the upstream side, and the anaerobic treatment tank N is an anaerobic filter bed tank first chamber. N1 and the anaerobic filter bed tank second chamber N2, and the aerobic treatment tank E includes a carrier fluidization tank E1 and a carrier filtration tank E2. The raw water to be treated flows from the raw water inflow part I into the first anaerobic filter bed tank N1, and in the order of the anaerobic filter bed tank second chamber N2, the carrier flow tank E1, the carrier filter tank E2, and the treated water tank T1. It is decomposed while being transferred downstream, passes through a disinfection tank Q provided above the treated water tank T1, and then discharged from the discharge port Z to the outside of the tank.
[0010]
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.
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 fluidization tank E1 as an overflow. Between the anaerobic filter bed second chamber N2 and the carrier flow tank E1, the overflow portion 1 is configured to allow natural flow of the water to be treated, and the overflow portion 1 is formed in a comb shape. The opening 2 is provided so that it can be transferred to the water to be treated and the carrier in the carrier flow tank E1 can be prevented from flowing backward. The opening has a lower end provided at the lowest water level of the anaerobic filter bed first chamber N1, and an upper end extended beyond the highest water level of the anaerobic filter bed second chamber N2.
[0011]
In the anaerobic filter bed tank second chamber N2 side corresponding to the upstream tank of the opening 2 in the partition wall W0 between the anaerobic filter bed tank second chamber N2 and the carrier flow tank E1, FIG. As shown in FIG. 2, a swing plate X having a water passage port a narrower than the opening 2 is provided, and the swing plate is swingably attached to the upstream tank side, and the swing plate is in a swing posture. The opening 2 is in an open state and an overflow portion 2a is formed to cover the opening 2 in a suspended posture, and swinging toward the carrier flow tank E1 which is the downstream tank is performed by the peripheral edge of the opening 2 The overflow part 2a is provided so as to be regulated by the water flow opening a.
Further, the upper end portion of the swing plate X, before SL when the water level in the anaerobic filter bed chamber second chamber N2 rises, the overflow portion to the overflow water to be treated to said downstream vessel from the upstream tank 2a is formed, and when a large amount of raw water to be treated flows into the septic tank, the water level of the upstream tank is increased by the overflow of the water to be treated from the overflow portion 2a. It is configured to be restricted at a predetermined position above the swing plate X.
[0012]
Specifically, an oscillating plate X that covers the lower part of the opening 2 formed with a large number of slits with a vertical length of 100 mm and a width of 10 mm is provided, and is slidably mounted around the horizontal axis at the upper end thereof. In the center of the swing plate X in the vertical direction, a hole having a diameter of 13 to 20 mm is formed and a water passage a is provided. A large number of water inlets are arranged in parallel in the width direction of the rocking plate X, and are set so that the flow rate can be suppressed. Thereby, it is set as the structure which the to-be-processed water which passed the said water flow opening a passes through the said opening part 2, and is transferred to the downstream tank from the said upstream tank.
[0013]
Thereby, when the water level of the anaerobic roadbed tank N2 is at a low position, the water to be treated is maintained at a level not exceeding the water inlet a, and the water is treated without the flow of the water to be treated.
When in the steady position, the swinging plate easily swings due to the bubbling effect of the air diffuser in the downstream side tank, and the opening is used as an overflow part. Between the anaerobic filter bed tank second chamber N2, there is a flow of water to be treated, and the return of floating sludge is satisfactorily performed,
When in the high position, the swing plate covers the opening and is in a swing-controlled state, while the anaerobic filter bed second chamber N2N1 passes through the water inlet to the carrier flow tank. The treated water advection is performed slowly.
When the water level further rises, the water to be treated is relatively abruptly used with the upper end portion of the swing plate as an overflow portion. For this reason, it becomes possible to perform early treatment of water to be treated that flows in a large amount and does not require much microbial treatment.
[0014]
Therefore, when a large amount of water to be treated flows into the septic tank, the space between the low water level and the high water state serves as a storage space for temporarily storing the water to be treated.
[0015]
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 carrier filtration tank E2 through the advection wall portion 3 provided in the first partition wall W1 that partitions the carrier flow tank E1 and the adjacent carrier 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.
[0016]
The carrier 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. Further, a filtration for allowing the water to be treated to flow freely at a position lower than the predetermined height of the second partition wall W2 separating the carrier filtration tank E2 and the treated water tank T1 provided adjacent to the carrier filtration tank E2. A wall 4 is formed. As a result, the water to be treated containing the sludge that is transferred to the carrier filtration tank E2 is filtered through the deposited filtration layer B on which the carrier C2 is deposited, and is almost free of solids. It is transferred to the treated water tank T1. The second partition wall W2 is connected to the side wall of the septic tank at the upper end portion, and the treated water tank T1 is arranged to be hidden under the carrier filtration tank E2 in 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.
Further, a backwash pipe D2 as a stirring device for agitating the inside of the carrier filtration tank E2 by aeration of the carrier C2 is provided at the lower part of the deposited filtration layer B to be constructed. The carrier can be regenerated by performing aeration from the backwash tube D2 in a time zone when the inflow of the load is small.
In addition, the backwash pipe D2 diffuses toward the advection wall portion 3, 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 aeration part Da configured to be raised and the air diffused toward the filtration wall part in the same manner, and air bubbles caused by the aeration pass through the filtration wall part 4, and on the treated water tank T1 side. A configuration in which a filtration wall portion aeration portion Db configured to be raised along the filtration wall portion 4 is provided, and the advection wall portion 3 and the filtration wall portion 4 are washed to prevent clogging and the like, respectively. It is as.
[0017]
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.
[0018]
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 together with the water to be treated from the inside of the carrier filtration tank E2 to the anaerobic filter bed tank first chamber N1.
[0019]
Moreover, even if a large amount of water to be treated flows into the septic tank slightly below the steady water level of the carrier flow tank E1 and the carrier filtration tank E2, the carrier C1 in the tank flows out so as not to flow into other tanks. The carrier holding member 10 to be prevented 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. 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 opening 13a as an outflow prevention member 13 so that the opening can be opened and closed.
Thereby, even if air is diffused into the carrier flow tank E1 and the carrier filtration tank E2 to form convection of the water to be treated, the flow is formed so as to flow smoothly without being inhibited by the carrier holding member 10. Is done. In addition, when the carriers C1 and C2 are filled in the carrier flow tank E1 and the carrier 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 can be used as a carrier loading portion, and the carrier can be easily loaded and sucked, so that it can be easily maintained.
[0020]
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 carrier filtration tank B, and the upper pipe of the carrier flow tank E1 is arranged to a minimum.
Thereby, even when it is necessary to take the diffuser tube out of the septic tank, for example, when performing maintenance of the diffuser tube D1, the diffuser tube D1 can be easily inserted and removed through the diffuser tube insertion hole 14, The work can be performed with almost no disassembly of the carrier holding member or the like.
[0021]
In the treated water tank T1, only the clean supernatant part that has passed through the carrier filtration tank E2 in the treated water can be discharged to the outside, and flows into the disinfecting tank Q provided in the upper part, and the solid disinfectant Q1 After contact is disinfected, it is discharged out of the tank.
[0022]
As a result, the carrier flow tank E1 and the carrier filtration tank E2 are arranged in a state in which the carrier can be easily replaced from the upper space. Therefore, during maintenance, the septic tank is not greatly decomposed and the like. It can be easily performed from the upper side through a manhole H provided at the top.
[0023]
[Another embodiment]
In the previous embodiment, the swing plate was adopted between the carrier flow tank E1 and the anaerobic filter bed second chamber N2. However, the present invention is not limited to this, and the flow rate is adjusted for abrupt water advection. Thus, the partition wall W0 may be used to partition between the tank that needs to stabilize the amount of advection water and the upstream tank. In any case, the treated water is stored while maintaining the gentle transfer of the treated water between the upstream tank and the downstream tank without providing the treated water transfer pump. When a large amount of water flows in, it is possible to achieve a configuration that allows overflow and relaxes the amount of water stored in the upstream tank.
In such a case, in addition to providing the opening in a slit shape, the partition wall W0 may be simply cut out and a swing plate may be provided in a part thereof.
[0024]
Moreover, as shown in FIG. 5, even if the transfer pump A2 which steadily transfers to-be-processed water is provided between the anaerobic filter bed tank first chamber N1 and the anaerobic filter bed tank second chamber N2. Well, in such a case, when the raw water inflow of the treated water into the septic tank is small, the treated water is transferred to the second anaerobic filter bed second chamber N2 on the downstream side, and a large amount of treated water is allowed to flow. You may employ | adopt the structure which makes the to-be-processed water storage space S formed freely. According to such a configuration, the water level in the first chamber N1 of the anaerobic filter bed tank is lowered to LWL at a time when the raw water inflow of the treated water is small, and a state in which a large amount of raw water inflow of the treated water can be accepted At the same time, when the water level reaches HWL due to a large inflow of water to be treated, the treatment efficiency of the water to be treated can be optimized as in the previous embodiment. Buffer capacity against inflow can be improved.
[Brief description of the drawings]
FIG. 1 is a vertical side view of a septic tank. FIG. 2 is a perspective view of the main part of the septic tank. FIG. 3 is a cross-sectional view of the main part of the septic tank. Vertical side view
X Swing plate W0 Partition wall 2 Opening part a Water flow port 2a Overflow part

Claims (2)

A partition of a septic tank in which a plurality of water treatment tanks are arranged in parallel and an overflow portion is provided on a partition wall that separates the upstream tank and the downstream tank from the upstream tank to overflow the treated water from the upstream tank. A wall structure,
An opening is provided in the partition wall,
The swinging plate is provided that is formed a narrow water passage opening than the opening,
The swing plate is swingably attached to the upstream tank side, and the opening is in an open state in a swinging posture to form an overflow portion, and at least a part of the opening is covered in a hanging posture. swinging Previous Symbol downstream tank side Ri by the opening peripheral edge portion is restricted, and the opening degree of the opening is restricted, provided as the through Mizuguchi is formed overflow portion partition wall structure of the septic tank are. The overflow part which overflows to-be-processed water from the said upstream tank to the said downstream tank when the water level of the said upstream tank rises is formed in the upper side of the said rocking | fluctuation plate. The partition wall structure of the septic tank as described.

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