JP3669850B2 - Septic tank - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a septic tank equipped with a carrier fluid tank that contains and holds a carrier that is formed so as to be able to flow together with water to be treated in a state where microorganisms are carried, and is provided with a diffuser that allows the carrier to flow by supplying bubbles.
[0002]
[Prior art]
Conventionally, this type of septic tank is provided with the carrier fluid tank by dividing the septic tank body into a plurality of pieces, and under the carrier fluid tank, sludge generated in the carrier fluid tank and the carrier are filtered for damming and filtering. There has been proposed a structure in which a layer is provided so that water to be treated can be freely distributed from above to fruit reports. With such a configuration, the sludge generated from the carrier fluidized tank can be dammed and the aeration can be decomposed and the water to be treated can be purified while preventing the advection of solids downstream. It is.
[0003]
[Problems to be solved by the invention]
However, since the carrier fluid tank is provided above the filtration layer, even if the filtration layer is clogged, it cannot be easily maintained. After removing the water to be treated and extracting all of the water to be treated in the carrier fluid tank, the various parts constituting the carrier fluid tank and the filtration layer are removed, and the entire septic tank is disassembled and reassembled. May be forced to. Therefore, it is proposed that the filtration layer is filled with a carrier and the filtration by the carrier is realized, the filtration layer is easily regenerated, and the clogging of the filtration layer is reduced. After all, if periodic inspection is not carried out, there still remains a problem that maintenance that requires disassembly and reassembly of the entire septic tank becomes necessary.
Accordingly, an object of the present invention is to provide a septic tank that can be worn by purifying the water to be treated without impairing the function of the above-described carrier flow tank, while maintaining easy maintenance, in view of the above drawbacks.
[0004]
[Means for Solving the Problems]
To achieve this object, the septic tank according to the present invention is characterized in that a carrier that is formed so as to be able to flow together with the water to be treated is contained and held in a state where microorganisms are supported, and the carrier is made to flow by supplying bubbles. With a carrier fluid tank provided with a gas part,
A filtration tank for filtering sludge;
A treated water tank for storing treated water that has passed through the filtration tank;
A large number of carriers having a specific gravity of 1 or more and 1.2 or less formed so as to be able to flow together with the water to be treated are accommodated in the filtration tank, and the carrier is sedimented and deposited in the filtration tank. Contains the layer formably,
The first partition partitioning the carrier fluid tank and the filtration tank is provided with a convection wall that blocks the advection of the carrier while allowing the advection of water to be treated.
The filtration tank and the treated water tank are partitioned, and a second partition wall facing the deposited filtration layer is provided with a filtration wall portion that allows the treatment water to flow while blocking the transfer of the carrier, and the filtration from the carrier flow tank. To the tank, the treated water tank, the water to be treated is configured to be freely transferred in this order,
Preferably, the circulation device is a diffuser,
An anaerobic treatment tank in which the treated water is treated anaerobically, such as a sedimentation separation tank, a contaminant removal tank, or an anaerobic filter bed tank, is provided upstream of the carrier flow tank to which the treated water is transferred. Preferably, there is provided a transfer means for transferring the water to be treated to the anaerobic treatment tank, and the advection wall portion may be provided at a position lower than the height of the deposited filtration layer of the first partition wall,
The advection wall portion may be provided from a lower position to a higher position than the height of the deposition filtration layer of the first partition wall,
The advancing wall portion may be provided to be inclined so that the bubbles supplied from the inside of the carrier fluidizing tank can be guided upward along the side surface of the carrier fluidizing tank of the advancing wall portion,
Moreover, it is preferable to provide the advection wall aeration part which supplies a bubble to the advection wall part in the carrier flow tank side lower part of the advection wall part.
In addition, the filtration wall portion is provided to be inclined so that air bubbles supplied from the treatment water tank can be guided upward along the side surface of the treatment water tank of the filtration wall portion, and the treatment water tank side lower portion of the filtration wall portion It is preferable that a filtration wall diffuser for supplying bubbles to the filtration wall is provided.
[0005]
[Function and effect]
In other words, in a state where microorganisms are supported, a carrier fluid tank is provided that holds and holds 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 microorganisms carried on the carrier are allowed to act while purifying the water to be treated while sufficiently contacting the gas and liquid while circulating in the carrier fluid tank.
And it is provided with the filtration tank which filters sludge, and the treated water tank which stores the to-be-treated water which passed the said filtration tank, and has many specific gravity 1 or more and 1.2 or less formed so that it can flow with treated water A carrier is accommodated inside the filtration tank, and a sedimentation filtration layer is freely formed in a state where the carrier is settled and deposited in the filtration tank, from the carrier flow tank to the filtration tank and the treated water tank. If the water to be treated is configured to be transportable in this order, the large number of carriers can be easily settled and deposited, and the deposited filtration layer can be easily formed in the filtration tank. At the same time, the water to be treated that has been treated in the carrier fluidized tank can flow into the filtration tank, pass through the carrier filtration layer, and be transferred to the treated water tank.
[0006]
Here, the first partition partitioning the carrier flow tank and the filtration tank is provided with a convection wall portion that blocks the transfer of the carrier while allowing the transfer of the water to be treated, and the filtration tank and the treatment water tank. And the second partition wall facing the deposition filtration layer is provided with a filtration wall portion that allows the transfer of the water to be treated and blocks the transfer of the support, so that the support in the support fluid tank is the filter tank. In addition, the carrier in the filtration tank is regulated so as not to flow into the treated water tank. On the other hand, sludge and the like generated in the carrier fluid tank enter the filtration tank from the carrier fluid tank together with the water to be treated, but the filtration wall portion is higher than the height when the carrier is sedimented. Since it is provided at a low position, the water to be treated must pass through the filtration wall portion through the deposited filtration layer, and at this time, the sludge and the like are filtered by the carrier. Moreover, since the said filtration tank is divided and provided with the said carrier flow tank by the 1st partition, it can form an upper part in an open state.
Furthermore, the carrier that has filtered the sludge and the like for a predetermined period in the filtration tank is gradually clogged and the filtration function gradually decreases, and the sludge decomposition treatment tends to be delayed. If a circulation device for circulating the carrier accommodated in the filtration tank is provided in the filtration tank, the carriers collide with each other by circulating and stirring the carrier in the water to be treated. The sludge adhering to the carrier is peeled off by the collision action, the carrier is regenerated, and the filtration function can be restored again.
[0007]
Accordingly, the water treatment by the carrier flow method can be efficiently performed and the generated sludge can be treated effectively, which is advantageous for continuation of stable operation and the filtration layer can be formed in an open top shape. Furthermore, maintenance could be made easier.
[0008]
Here, if the circulation device is composed of an air diffuser, it is possible to expect an effect of washing and regeneration of the carrier by supplying bubbles to the carrier, although it is a simple structure. If the transfer means is provided, the sludge generated by the regeneration is transferred to an anaerobic treatment tank such as a sedimentation separation tank, a strong substance removal tank or an anaerobic filter bed tank, and more effective decomposition. Can be planned.
[0009]
Further, if the advection wall portion is provided at a position lower than the height of the deposition filtration layer of the first partition wall, the water to be treated that passes through the filtration tank surely passes through the deposition filtration layer. Therefore, it is easy to achieve reliable filtration.
Further, in the case where the advection wall portion is provided from a position lower than a height of the deposited filtration layer of the first partition wall, the separation that occurs when the carrier is regenerated by stirring the filtration tank. Sludge tends to flow backward from the upper side of the sedimentation filtration layer to the carrier flow tank, and an improvement in sludge treatment efficiency can be expected.
The height of the deposited filtration layer referred to in the present invention refers to the height of the upper surface of the deposit formed by the carrier in the filtration tank naturally settled after stirring in the filtration tank, and the amount of the carrier is The volume can be adjusted based on the apparent volume when the carrier is almost completely settled.
Further, while the carrier fluid tank maintains a fluid state almost always, the filtration tank must be regenerated intermittently, but a new load is generated in the carrier fluid tank such as at night. In anticipation of difficult times, the filtration tank is agitated and sludge is separated from the carrier. After waiting for the carrier to settle and deposit again, steady operation of the septic tank is attempted without lowering the biological treatment efficiency. I can do it. If the specific gravity of the carrier is adjusted to about 1 to 1.2, the time required for this can be suppressed to about several minutes.
[0010]
Furthermore, if the advancing wall portion is inclined and provided so that the bubbles supplied from the inside of the advancing carrier portion can be guided upward along the side surface of the advancing carrier portion of the advancing wall portion, Since the flow of the water to be treated collides with the advection wall part together with bubbles, it is possible to suppress clogging due to sludge adhering by washing the advection wall part, This contributes to the steady and stable operation of the septic tank.
Further, if the advection wall diffuser for supplying bubbles to the advection wall is provided at the lower part of the advection wall on the side of the carrier flow tank, bubbles can be positively supplied to the advection wall. Is easy to appear and is preferable.
In addition, the filtration wall portion is provided to be inclined so that air bubbles supplied from the treatment water tank can be guided upward along the side surface of the treatment water tank of the filtration wall portion, and the treatment water tank side lower portion of the filtration wall portion If there is a filtration wall diffuser for supplying air bubbles to the filtration wall, even if sludge adheres to the filtration wall, the filtration wall is washed to prevent clogging and the like. This contributes to the steady and stable operation of the septic tank, and can be configured easily.
[0011]
Note that if the advection wall portion and the filtration wall portion are both inclined in the above-described configuration, the filtration tank is formed so as to expand upward. In addition, it is easy to form a situation where the whole ascends loosely and starts to circulate, and the blocking phenomenon does not easily occur, so that the carrier can be regenerated well. In the vicinity of, it is difficult to cause a problem that the carrier density is lowered and the filtration efficiency is lowered. In addition, when the stirring operation is realized by the air diffuser, if blocking occurs, bubbles may escape to the outside of the filtration tank through the advection wall portion and the filtration wall portion. Can be effectively prevented. In this case, it is desirable that the air diffuser is located at substantially the center of the bottom of the filtration tank.
[0012]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
The septic tank of the present invention comprises an anaerobic treatment tank N, an aerobic treatment tank E, a treated water tank T1, etc. from the upstream side, and the anaerobic treatment tank N comprises a precipitation separation tank N1 and an anaerobic filter bed tank N2, and the aerobic treatment tank The processing tank E includes a carrier fluid tank E1 and a filtration tank E2. The raw water to be treated flows into the sedimentation separation tank N1 from the raw water inflow section I, and is decomposed while being transferred downstream in the order of the anaerobic filter bed tank N2, the carrier flow tank E1, the filtration tank E2, and the treated water tank T1. After passing through the disinfection tank Q provided above the settling tank T2, it is discharged from the discharge port Z to the outside of the tank.
[0013]
The sedimentation separation tank N1 is configured to be able to store raw water to be treated, and is capable of growing anaerobic microorganisms therein. The raw water to be treated that flows into the precipitation separation tank N1 is stored in the precipitation separation tank N1 and is anaerobically decomposed, and mainly coarse organic matter is subdivided, and the lower part of the precipitation separation tank N1 From N1 to the lower part of the anaerobic filter bed tank N2. Solids such as sludge that are not easily decomposed are stored as precipitates in the lower part of the precipitation separation tank N1 or as scum in the upper part of the precipitation separation tank N1.
The anaerobic filter bed tank N2 includes an anaerobic filter bed F, and is configured to fix and grow anaerobic microorganisms on the anaerobic filter bed F. The water to be treated which has flowed into the anaerobic filter bed tank N2 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 so that water to be treated can be naturally transferred, and the overflow portion 1 is provided with a comb-like portion 2 to be treated. It is configured such that it can be transferred to water and the carrier and sludge in the carrier flow tank E1 can be prevented from flowing back.
[0014]
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, and the carrier C1 is caused to flow in the carrier flow tank E1 by supplying bubbles from the air diffuser. 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 and the adjacent filtration tank.
The advection wall portion 3 is formed in a lattice shape or a comb blade shape, and is configured to prevent the advancing of the carrier but to permit the advancing of sludge and water to be treated.
Further, an aeration wall diffuser is provided below the advection wall 3 of the first partition wall W1 with an aeration tube Da. The first partition wall W <b> 1 is provided in an inclined posture covering the upper side of the advection wall diffuser Da together with the advection wall 3, and the advection wall 3 is diffused by aeration. It is configured to prevent clogging and the like.
[0015]
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 4 which makes a to-be-processed water flow freely is formed in the position lower than the said predetermined height of the said filtration tank E2 and the 2nd partition W2 provided adjacent to the filtration tank E2. 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 filtration wall 4 is formed in a lattice shape, and prevents the advection of the carrier C2, but allows the advection of sludge and water to be treated.
Further, an aeration pipe D2 as a stirring device for agitating the inside of the filtration tank by aerating the carrier C2 is provided at the lower part of the deposited filtration layer so that the load flows into the septic tank such as at night. The carrier is regenerated by performing aeration from the diffusion tube D2 in a short time zone.
In addition, an aeration wall diffuser is provided below the filtration wall 4 of the second partition wall W2 with a diffuser tube Db. In addition, the second partition wall W2 is provided in an inclined posture that covers the upper side of the advection wall diffuser together with the filter wall 4 and diffuses into the filter wall 4 to thereby The configuration prevents clogging and the like.
Thereby, since the upper side of the filtration tank E2 is provided in an open state, the maintenance can be easily performed from the upper side through the manhole H provided in the septic tank without disassembling the inside of the septic tank.
[0016]
Here, the filtration wall portion is provided at a position lower than a predetermined height that is the height of the deposition upper end portion of the deposition filtration layer so that the water to be treated must be transferred after passing through a predetermined distance of the deposition filtration layer. is there. In addition, the said advection wall part should just be the structure which accept | permits the advection of to-be-processed water as the structure which reaches to the upper side of the said predetermined height, and enables filtration of the to-be-processed water in the said sedimentation filtration layer.
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.
[0017]
Further, the carrier flow tank E1 is provided with an air lift pump A1 for transferring the water to be treated to the precipitation separation tank N1, so that the sludge generated by the water treatment can be transferred to the precipitation separation tank N1 together with the water to be treated. In addition, the filtration tank E2 is provided with an air lift pump A2 for transferring the water to be treated to the precipitation separation tank N1, and the sludge generated by the regeneration of the carrier C2 is extracted from the filtration tank E2 into the filtration tank E2. It can transfer with the to-be-processed water to the sedimentation separation tank N1.
[0018]
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.
[0019]
[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 V 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.
[Brief description of the drawings]
FIG. 1 is a vertical side view showing a septic tank according to the present invention. FIG. 2 is a plan view showing a septic tank according to the present invention.
E aerobic treatment tank E1 carrier flow tank E2 filtration tank I raw water inflow section N anaerobic treatment tank N1 sedimentation separation tank N2 anaerobic filter bed tank T treated water tank Z outlet

Claims (8)

In a state where microorganisms are supported, a carrier fluid tank is provided that contains and holds a carrier that is formed to be flowable together with the water to be treated, and is provided with an air diffuser that allows the carrier to flow by supplying bubbles.
A filtration tank for filtering sludge;
A treated water tank for storing treated water that has passed through the filtration tank,
A large number of carriers having a specific gravity of 1 or more and 1.2 or less formed to flow with the water to be treated are accommodated in the filtration tank, and the deposited filtration layer is formed in a state where the carrier is settled and deposited in the filtration tank. To accommodate freely,
In the first partition partitioning the carrier fluid tank and the filtration tank, while providing the advection wall portion that blocks the advection of the carrier while allowing the advection of the water to be treated,
A filter tank and a treated water tank are partitioned, and a second partition wall facing the deposited filtration layer is provided with a filtration wall portion that blocks the transfer of the carrier while allowing the transfer of water to be treated, and the carrier accommodated in the filtration tank Providing a circulation device for circulation in the filtration tank;
A septic tank constructed such that the water to be treated can be transferred in this order from the carrier fluid tank to the filtration tank and the treated water tank. The septic tank according to claim 1, wherein the circulation device is an air diffuser. The septic tank according to claim 1, wherein an anaerobic treatment tank is provided upstream of the carrier flow tank to which the water to be treated is transferred, and a transfer means for transferring the water to be treated from the filtration tank to the anaerobic treatment tank. The septic tank according to claim 1 or 2, wherein the advection wall portion is provided at a position lower than a height of the deposition filtration layer of the first partition wall. The septic tank according to any one of claims 1 to 3, wherein the advection wall portion is provided from a lower position to a higher position than a height of the deposition filtration layer of the first partition wall. The advection wall portion is provided so as to be inclined so that bubbles supplied from within the carrier flow vessel can be guided upward along the side surface of the carrier flow vessel of the advection wall portion. The septic tank described in 1. The septic tank according to claim 5, wherein a convection wall aeration section for supplying bubbles to the convection wall section is provided at a lower part of the convection wall section on the carrier flow tank side. The filtration wall portion is provided to be inclined so that air bubbles supplied from the treatment water tank can be guided upward along the side surface of the treatment water tank of the filtration wall portion, and the treatment water tank side lower portion of the filtration wall portion The septic tank according to claim 6, wherein a filtration wall aeration part for supplying bubbles to the filtration wall part is provided.

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