JP2000176475A - Septic tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a septic tank in which water to be treated can be cleaned without spoiling a function of a carrier fluidized tank even when it is constituted for easy maintenance. SOLUTION: This septic tank is provided with a carrier fluidized tank E1 provided with a diffusing part for fluidizing carriers C1 by feeding air bubbles, and also it is provided with a tank filter E2 for filtering off sludge and a treated water tank T1 for storing water to be treated that has passed through the tank filter E2. A lot of carriers C2 having specific gravity of 1-1.2 are housed inside the tank filter E2. The carriers C2 are housed, settled and deposited in the tank filter so that a deposited filter bed is freely formed. A first partition wall W1 for marking off the carrier fluidized tank El from the tank filter E2 is provided with a flow transfer wall part 3 for cutting off flow transfer of the carriers C2 while allowing flow transfer of the water to be treated, and also a second partition wall W2 facing the deposited filter bed for marking off the tank filter E2 from the treated water tank T1 is provided with a filter wall part for cutting off flow transfer of the carriers C2 while allowing flow transfer of the water to be treated. In this way, the water to be treated is freely transferred from the carrier fluidized tank E1 to the tank filter E3 and the treated water tank T1 in this order.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a method for carrying microorganisms.
The present invention relates to a purification tank provided with a carrier flowing tank provided with a diffuser for accommodating and holding a carrier formed to be flowable together with water to be treated and supplying the carrier by supplying air bubbles.

[0002]

2. Description of the Related Art Conventionally, this type of septic tank has a septic tank main body divided into a plurality of sections to provide the carrier flowing tank, and a sludge generated in the carrier flowing tank and the carrier are damped below the carrier flowing tank. Provide a filtration layer to stop and filter,
There has been proposed a structure in which water to be treated is freely circulated from above to a fruit report. With such a configuration, the sludge generated from the carrier fluidized tank can be blocked, aerobicly decomposed, and purified water can be purified while preventing the transfer of solids to the downstream side. It is.

[0003]

However, since the carrier fluidizing tank is provided above the filter layer, even if the filter layer is clogged, maintenance cannot be easily performed. For example, after performing processing such as blocking the inflow of the water to be treated into the septic tank and extracting all the water to be treated in the carrier fluidized tank, removing the various members constituting the carrier fluidized tank and the filtration layer, etc. In some cases, the entire septic tank must be disassembled and reassembled. Therefore, it is proposed to reduce the clogging of the filtration layer by filling the carrier into the filtration layer and realizing the filtration by the carrier as a configuration that facilitates the regeneration of the filtration layer. As a matter of course, there is still a problem that if periodic inspection is not performed, maintenance that requires disassembly and reassembly of the entire septic tank is required. SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a purification tank that can be treated because it purifies the water to be treated without compromising the function of the above-mentioned carrier fluidization tank, while being configured easily for maintenance in view of the above-mentioned drawbacks.

[0004]

A feature of the present invention for achieving this object is that a septic tank according to the present invention stores and holds a carrier which is formed so as to be capable of flowing together with water to be treated while carrying microorganisms. A carrier flow tank provided with a diffuser for flowing the carrier by supplying bubbles, a filtration tank for filtering sludge, and a treated water tank for storing treated water passing through the filtration tank are provided. A large number of carriers having a specific gravity of 1 or more and 1.2 or less, which are formed so as to be able to flow with water, are accommodated in the filtration tank, and the carriers are settled in the filtration tank.
An advection wall portion for accommodating the deposited filtration layer in the deposited state and for allowing the advancing of the water to be treated to the first partition partitioning the carrier flow tank and the filtration tank, while preventing the advection of the carrier. And a partition wall that separates the filtration tank and the treatment water tank, and a second partition wall facing the sedimentation filtration layer is provided with a filtration wall portion that blocks the flow of the carrier while allowing the flow of the water to be treated. From the tank to the filtration tank, to the treated water tank, in that it is configured to be able to transfer the water to be treated in this order, it is preferable if the circulating device is a diffuser, the carrier flow to transfer the water to be treated An anaerobic treatment tank in which water to be treated such as a sedimentation separation tank or a contaminant removal tank or an anaerobic filter bed tank is anaerobically treated is provided on the upstream side of the tank, and the treated water is supplied from the filtration tank to the anaerobic treatment tank. It is preferable if a transfer means for transferring is provided,
The advection wall portion may be provided at a position lower than the height of the sedimentation filtration layer of the first partition, and the advection wall portion may be higher than a height of the sedimentation filtration layer of the first partition wall. The advection wall portion may be provided over a position, and the advection wall portion is provided to be inclined so that air bubbles supplied from inside the carrier flow tank can be guided upward along the carrier flow tank side surface of the advection wall portion. Preferably, an advection wall diffuser for supplying air bubbles to the advection wall is provided below the advection wall on the side of the carrier flow tank. In addition, the filter wall portion is provided to be inclined so that bubbles supplied from the treatment water tank can be guided upward along the treatment water tank side surface of the filtration wall portion, and a lower portion of the filtration wall portion on the treatment water tank side. Preferably, a filter wall air diffuser for supplying air bubbles to the filter wall is provided.

[Effects] In other words, a carrier fluid having a diffusion member for accommodating and holding a carrier that is formed to be flowable together with the water to be treated while supporting the microorganisms and providing the carrier by supplying air bubbles. Since the tank is provided, the microorganisms carried on the carrier are sufficiently contacted with gas and liquid while circulating in the carrier fluidization tank, and are activated while purifying the water to be treated. And a filtration tank for filtering sludge, and a treated water tank for storing the water to be treated 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, which are formed so as to be able to flow together with the water to be treated, are accommodated in the filtration tank, and the carriers are settled and deposited in the filtration tank and deposited and filtered. If a layer is formed so as to be freely formed and the water to be treated is configured to be freely transportable in this order from the carrier flowing tank to the filtration tank and the treatment water tank, the large number of carriers can be easily settled and deposited. It is possible to easily form the sediment filtration layer in the filtration tank, and the water to be treated treated in the carrier fluidized tank flows into the filtration tank and passes through the carrier filtration layer. Thus, the water can be transferred to the treated water tank.

Here, an advection wall portion for interrupting the advancing of the carrier is provided on the first partition partitioning the carrier flowing tank and the filtering tank, while allowing the advancing of the water to be treated. Partitioning the treatment water tank, the second partition wall facing the sedimentation filtration layer, while allowing the advection of the water to be treated, since a filtration wall is provided to block the advection of the carrier, the carrier in the carrier flow tank is It is regulated so that it does not flow into the filtration tank and the carrier in the filtration tank does not flow into the treated water tank.
On the other hand, the sludge and the like generated in the carrier fluidized tank enter the filtration vessel from the carrier fluidized vessel together with the water to be treated, but the filtration wall portion is higher than the height when the carrier is settled and deposited. Since it is provided at a low position, the water to be treated must pass through the filtration wall portion through the sedimentation filtration layer, and at this time, the sludge or the like is filtered by the carrier. Further, since the filtration tank is provided by being separated from the carrier fluidization tank by a first partition wall, an upper portion can be formed in an open state. Furthermore, in the filtration tank, the carrier that has filtered the sludge or the like for a predetermined period gradually becomes clogged and the filtration function gradually decreases, and the decomposition treatment of the sludge tends to be delayed. If a circulator for circulating the carrier accommodated in the filtration tank in the filtration tank is provided therein, the situation in which 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 separated by the collision action, the carrier is regenerated, and the filtration function can be restored again.

Therefore, the water treatment by the carrier fluidization method can be performed efficiently, and the generated sludge can be treated effectively, which is advantageous for the continuation of stable operation and the filter layer is formed in an open top shape. And maintenance was made easier.

Here, if the circulating device is constituted by an air diffuser, the cleaning and regeneration effect of the carrier by the supply of air bubbles to the carrier can be expected in spite of the simple structure, so that an efficient carrier is provided. If the transfer means is provided, the sludge and the like generated by the regeneration are transferred to an anaerobic treatment tank such as a sedimentation separation tank or a strong substance removal tank or an anaerobic filter bed tank, so that more effect can be obtained. Decomposition can be achieved.

Further, if the advection wall portion is provided at a position lower than the height of the sediment filtration layer of the first partition, the water to be treated passing through the filtration tank surely passes through the sediment filtration layer. , It is easy to realize reliable filtration. Further, when the advection wall portion is provided from a position lower than a height of the deposition filtration layer of the first partition to a higher position, peeling that occurs when the filtration tank is agitated to regenerate the carrier. Sludge easily flows back from the upper side of the sedimentation and filtration layer into the carrier fluidization tank, and improvement in sludge treatment efficiency can be expected. In addition, the height of the sedimentation filtration layer referred to in the present invention refers to the height of the upper surface of the sediment formed by the carrier in the filtration tank spontaneously settling after stirring in the filtration tank, and the amount of the carrier is
It can be adjusted on the basis of the apparent volume when substantially all of the carrier is settled. Further, while the carrier fluidizing tank keeps the fluidized state almost always, the filtering vessel has to perform an intermittent regeneration operation, but a new load is generated in the carrier fluidizing vessel such as at night. In anticipation of difficult times, the filter tank is agitated to separate the sludge from the carrier, and then the carrier is allowed to settle and accumulate again. I can do it. Incidentally, 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.

Furthermore, if the advection wall portion is provided so as to be able to guide bubbles supplied from inside the carrier flow tank upward along the side surface of the advection wall portion of the carrier flow tank, Since the flow of the water to be treated in the carrier fluidizing tank collides with the advection wall together with the air bubbles, the advection wall is cleaned to prevent the sludge or the like from adhering to prevent clogging. It also contributes to the steady and stable operation of the septic tank. Further, if an advection wall diffuser for supplying air bubbles to the advection wall is provided at a lower portion of the advection wall on the side of the carrier flow tank, air bubbles can be positively supplied to the advection wall, so that the cleaning effect can be obtained. Is easy to appear greatly, which is preferable. In addition, the filter wall portion is provided to be inclined so that bubbles supplied from the treatment water tank can be guided upward along the treatment water tank side surface of the filtration wall portion, and a lower portion of the filtration wall portion on the treatment water tank side. If the filter wall is provided with a filter wall diffuser for supplying air bubbles to the filter wall, even if sludge or the like adheres to the filter wall, the filter wall is washed as before to prevent clogging and the like. This contributes to achieving stable and stable operation of the septic tank, and can be configured for easy maintenance.

If the advection wall section and the filtration wall section are both provided with an inclination in the above-described configuration, the filtration tank is formed to expand upward, so that the carrier is brought into a fluid state by the stirring operation and settles again. When depositing, it is easy to form a situation in which the whole rises while loosening and begins to circulate, and the blocking phenomenon is unlikely to occur, so that the carrier can be regenerated well. In the vicinity of the filtration wall, a problem that the carrier density is reduced and the filtration efficiency is reduced is less likely to occur. Further, when the stirring operation is realized by the air diffuser, when blocking occurs, there is a possibility that bubbles may escape to the outside of the filtration tank through the advection wall portion and the filtration wall portion. Phenomena can be efficiently prevented. In this case, it is desirable that the air diffuser is located substantially at the center of the bottom of the filtration tank.

[0012]

Embodiments of the present invention will be described below with reference to the drawings. The purification tank of the present invention includes an anaerobic treatment tank N, an aerobic treatment tank E, a treatment water tank T1, and the like from the upstream side. The anaerobic treatment tank N includes a sedimentation separation tank N1 and an anaerobic filter bed tank N2.
And the aerobic treatment tank E comprises a carrier fluidization 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 fluidization tank E1, the filtration tank E2, and the treatment water tank T1. After passing through the disinfecting tank Q provided above the sedimentation tank T2, the water 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 to flow therein, so that anaerobic microorganisms can be grown therein. The raw water to be treated flowing into the sedimentation separation tank N1 is stored in the sedimentation separation tank N1 and is also anaerobically decomposed, and mainly the coarse organic matter is subdivided. 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 sediment in the lower part of the sedimentation separation tank N1 or as scum in the upper part of the sedimentation separation tank N1. The anaerobic filter bed tank N2 is provided with an anaerobic filter bed F, and is configured to grow the anaerobic filter bed F by fixing and maintaining anaerobic microorganisms. The water to be treated that has flowed into the anaerobic filter bed tank N2 is further subjected to anaerobic treatment and is decomposed to a state in which there is almost no solid matter.
Sent to overflow. Between the anaerobic filter bed tank N and the carrier fluidizing tank E1, the water to be treated is naturally allowed to flow by an overflow part 1, and the overflow part 1 is provided with a comb-shaped part 2 to be treated. The carrier and the sludge in the carrier fluidization tank E1 can be prevented from flowing back, and can be transferred to water.

The carrier fluidizing tank E1 contains a carrier C1 which is formed so as to be able to flow with the water to be treated in a state in which microorganisms are supported, and is provided with an air diffuser D1 for flowing the carrier by supplying bubbles. A diffuser is provided inside and the carrier C is supplied by air supply from the diffuser.
1 is made to flow in the carrier flow tank E1. With such a configuration, the water to be treated flowing into the carrier fluidization tank E1 is purified by aerobic decomposition by aerobic microorganisms. The water to be treated that has undergone such treatment is transferred to the filtration tank E2 through the advection wall section 3 provided on the first partition W1 that separates 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 advection of the carrier but allow the advection of sludge or water to be treated. An aeration tube Da is provided below the advection wall portion 3 of the first partition wall W1 with an aeration tube Da. The first partition wall W1 is provided with the advection wall portion 3 in an inclined position to cover the upper side of the advection wall diffusion portion Da. Is configured to prevent clogging or the like.

The filter tank E2 is formed by filling a carrier C2 having a specific gravity higher than that of water at a high density up to a predetermined height. Further, a filtration wall portion 4 for allowing the water to be treated to flow freely is formed at a position lower than the predetermined height of the filtration tank E2 and a second partition W2 provided adjacent to the filtration tank E2. As a result, the water to be treated including the sludge flowing to the filtration tank E2 is filtered through the sediment filtration layer B on which the carrier C2 is deposited, and becomes substantially free of solids. It is transferred to the water tank T1. The filter wall portion 4 is formed in a lattice shape, and is configured to prevent the flow of the carrier C2 but allow the flow of sludge and water to be treated. Further, an air diffuser D2 as an agitator for diffusing the carrier C2 and agitating the inside of the filtration tank is provided at a lower portion of the deposited filtration layer. The air is diffused from the air diffuser D2 in a small time zone, and the carrier can be regenerated. An air diffuser Db is provided below the filtration wall portion 4 of the second partition wall W2.
And an advection wall diffuser is provided. Further, the second partition wall W2 is provided in an inclined posture to cover the upper side of the advection wall diffuser together with the filter wall 4, and the filter wall 4 is diffused by diffusing the filter wall 4. It is configured to prevent clogging and the like. Accordingly, since the upper side of the filtration tank E2 is provided in an open state, maintenance can be easily performed from above through the manhole H provided in the purification tank without disassembling the inside of the purification tank.

Here, the filtration wall portion is located at a position lower than a predetermined height which is the height of the upper end of the pile of the piled filtration layer so that the water to be treated passes through a predetermined distance of the piled filtration layer without fail. It is provided in. The advection wall portion may be configured to reach the upper side of the predetermined height, so long as it allows the advection of the water to be treated and enables the filtration of the water to be treated in the deposition filtration layer. The carriers C1, C
No. 2 is formed to have a specific gravity of 1 or more and 1.2 or less that can flow with the water to be treated.

Further, an air lift pump A for transferring the water to be treated to the sedimentation separation tank N1 is provided in the carrier fluidization tank E1.
1 is provided so that the sludge generated by the water treatment can be transferred together with the water to be treated to the sedimentation separation tank N1, and the water to be treated is transferred to the filtration tank E2 to the sedimentation separation tank N1. Air lift pump A2 is provided,
The sludge generated by the regeneration of the carrier C2 is passed through the filtration tank E.
2 to the sedimentation separation tank N1 together with the water to be treated.

The treated water tank T1 allows only the clean supernatant portion that has passed through the filtration tank E2 to be discharged to the outside, flows into the disinfecting tank Q provided above the sedimentation tank T2, and contacts the solid disinfectant Q1. After being disinfected, it is discharged outside the tank.

[Alternative Embodiment] In the above embodiment, the advection wall 3 and the filtration wall 4 are connected to the first and second partitions W1,
Although the structure integrally formed with W2 is shown, it may be configured to be detachable from the first and second partition walls W1 and W2,
Further, the first and second partition walls W1 and W2 provided with the advection wall portion V or the filtration wall portion 4 may be provided detachably with respect to the purification tank. Further, in FIG. 1, the aerobic treatment tanks E1 and E2 are provided in parallel in the width direction. However, the arrangement in plan view is not limited to the above-described arrangement, for example, provided in series in the longitudinal direction.

[Brief description of the drawings]

FIG. 1 is a longitudinal sectional 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.

FIG. 3 is a longitudinal sectional front view showing a septic tank according to the present invention.

[Explanation of symbols]

 E Aerobic treatment tank E1 Carrier flow tank E2 Filtration tank I Raw water inlet N Anaerobic treatment tank N1 Precipitation separation tank N2 Anaerobic filter bed tank T Treatment water tank Z Discharge port

Claims (8)

[Claims] 1. A carrier flow tank provided with a diffuser for accommodating and holding a carrier formed to be flowable together with water to be treated in a state in which microorganisms are supported, and having a diffuser for flowing the carrier by supplying bubbles. A filtration tank for filtering the sludge, and a treated water tank for storing the water to be treated that has passed through the filtration tank, and 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 with the water to be treated, It is housed inside the filtration tank, and the carrier is settled and deposited in the filtration tank so that a sedimentary filtration layer can be freely formed. The water to be treated flows to the first partition that separates the carrier flow tank and the filtration tank. While providing an advection wall to block the advection of the carrier, partitioning the filtration tank and the treated water tank, the second partition facing the sedimentation filtration layer, while allowing the advection of the water to be treated, A filter wall to block advection was provided and housed in the filter tank. Circulation device for circulating the body into the filtration tank is provided, said filtration tank from the carrier fluidizing tank, to the treating tank, are transported freely configure treated water in this order septic tank. 2. The air circulation device according to claim 1, wherein the circulation device is a diffuser.
The septic tank described in 1. 3. The anaerobic treatment tank provided upstream of the carrier fluidizing tank through which the water to be treated flows, and a transfer means for transferring the treated water from the filtration tank to the anaerobic treatment tank is provided. The septic tank described. 4. The advection wall portion is provided at a position lower than the height of the sedimentation and filtration layer of the first partition.
The septic tank described in 1. 5. The septic tank according to claim 1, wherein the advection wall portion is provided from a position lower than a height of the deposition filtration layer of the first partition to a position higher than the height. 6. The advection wall portion is inclined so that bubbles supplied from inside the carrier flow tank can be guided upward along the side surface of the advection wall portion of the carrier flow tank. A septic tank according to any one of claims 1 to 4. 7. The septic tank according to claim 5, wherein an advection wall diffuser for supplying air bubbles to the advection wall is provided below the advection wall on the side of the carrier flow tank. 8. The filter wall is provided so as to be inclined so that bubbles supplied from the treated water tank can be guided upward along the side of the treated water tank of the filter wall, and the treatment of the filter wall is performed. The septic tank according to claim 6, further comprising: a filter wall diffuser for supplying air bubbles to the filter wall at a lower portion on the water tank side.