JPH10290990A - Combined septic tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To efficiently treat the waste water of a disposer for garbage treatment and to release treated water with good quality without increasing the capacity scale of the conventional domestic waste water septic tank. SOLUTION: This combined septic tank for dealing with the disposer for executing the purifying treatment of the waste water from the disposer for disposing the crude refuse together with the domestic waste water has a separating tank 1, a sludge decomposing tank 2 and an aerobic treating tank 3. Sewage is admitted from the separating tank 1 into the aerobic treating tank 3 where the sewage is subjected to an aerobic treatment. The sludge separated in the separating tank 1 is transferred to the sludge decomposing tank 2 where the sludge is subjected to a decomposition treatment.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD [0001] The invention of this application relates to a combined septic tank. More specifically, the invention of this application is a disposer-compatible type that can effectively treat wastewater from a disposer for treating garbage generated in a kitchen together with domestic wastewater without requiring a large capacity increase. It relates to the merged septic tank.

[0002]

2. Description of the Related Art A disposer provided with a crusher, a solid-liquid separation device, and the like has been proposed as a means for treating garbage generated in a kitchen on the spot. As for this disposer, a device provided with a septic tank for treating wastewater from the disposer has been proposed by the inventors of the present application as a measure to reduce the increase in the load on the surrounding environment due to the processing of garbage. Japanese Unexamined Patent Publication No. Hei 8-1-1135 and Japanese Unexamined Patent Publication No. Hei 8-257540).

[0003]

However, in the conventional disposer system for treating garbage, the treatment of the wastewater is intended only for the disposer wastewater, that is, the kitchen wastewater, and the wastewater or other waste in a house or the like is treated. It did not correspond to domestic wastewater, which is a general wastewater. For this reason, the wastewater treatment system is different from the one for domestic wastewater, which inevitably increases the facility load, and the problem of installation space has been a limiting factor.

Therefore, it is conceivable to put the disposer wastewater into a septic tank for domestic wastewater, but this is not easy. This is because deterioration of water quality and increase of excess sludge generation are inevitable due to an increase in load caused by the input of the disposer drainage, and the capacity must be increased as a combined septic tank. For example, when a five-person tank is required as a normal domestic wastewater purification tank, the size of the tank must be at least seven for a disposer-compatible type.

[0005] By increasing the capacity, it is considered that the load per unit volume can be reduced and the quality of treated water can be ensured. However, such an increase in the capacity of the unit is restricted by the installation place and the construction cost. Increase, increase transportation, inventory costs and manufacturing costs. The increase in solids and sludge treatment loads due to the disposer drainage also makes it difficult to improve the quality of the effluent by simply increasing the capacity.

The invention of this application solves the above-mentioned drawbacks of the prior art, and efficiently discharges wastewater from a disposer for disposal of garbage as well as domestic wastewater without increasing the capacity of the apparatus. It is an object of the present invention to provide a new merged septic tank compatible with a disposer, which can also improve the water quality.

[0007]

Means for Solving the Problems The present invention solves the above-mentioned problems, and is a disposer-compatible combined septic tank for purifying wastewater from a disposer for disposing of garbage together with domestic wastewater, the separation tank comprising: And a sludge decomposition tank and an aerobic treatment tank, and the sewage flows into the aerobic treatment tank from the separation tank and is subjected to aerobic treatment, and the sludge separated in the separation tank is transferred to the sludge decomposition tank. Provided is a combined septic tank characterized by being decomposed.

Further, the invention of this application relates to a combined septic tank, in which the separation tank is a sedimentation separation tank for separating solids in the inflowing sewage, and the decomposition treatment tank is used to carry microorganisms together with a water conditioning material. The sludge is packed with wood chips as a body, and the sludge is returned to the separation tank from the aerobic treatment tank and the combined septic tank, which is stirred and mixed with the wood chips in the decomposition treatment tank and biologically treated. The combined septic tank and separation tank with return pipe are combined septic tanks that are anaerobic hearth tanks that have the function of anaerobic biodegradation of solids and sludge, and the aerobic treatment tank is a combined septic tank that is a contact aeration tank. The treatment tank is an activated sludge treatment tank. In particular, the aerobic treatment tank also provides a combined septic tank and the like which is a membrane separation activated sludge tank.

[0009]

According to the present invention as described above, it is possible to efficiently purify the disposer wastewater together with the domestic wastewater by setting the capacity of the disposer wastewater to the same level as a conventional household wastewater purification device. . That is,
FIG. 1 is a block diagram illustrating the configuration of the combined septic tank according to the present invention. As illustrated in FIG. 1, a separation tank (1), a sludge decomposition tank (2), and an aerobic treatment tank ( The disposer wastewater (A) and the domestic wastewater (B) such as human waste and miscellaneous wastewater generated by treating raw garbage from the kitchen sink or the like with the disposer (4) are first separated into tanks (1). And the sludge separated as a solid content is transferred to a sludge decomposition tank (2) for decomposition treatment. The intermediate water from the separation tank (2) is transferred to the aerobic treatment tank (2),
It is subjected to aerobic treatment and discharged as effluent water (C) through, for example, a disinfection tank (5). From the aerobic treatment tank (3), excess sludge is also returned to the separation tank.

[0010] For example, in this manner, the combined purification processing of the present invention can be performed. More specifically, the features will be described as an embodiment by showing an example below.

[0011]

FIG. 2 is a sectional view showing the configuration of a combined septic tank according to an embodiment of the present invention, and FIG. 3 is a block diagram showing a processing flow thereof. In this example,
A sedimentation separation tank (11) is used as the separation tank (1),
A contact aeration tank (31) is used as the aerobic treatment tank (3). Further, the sludge decomposition tank (21) is filled with a wood strip (211) supporting microorganisms together with a moisture regulator, and the wood strip (211) is filled with a stirring motor (21).
It is designed to be stirred by 2).

The wastewater (A) and domestic wastewater (B) from the disposer (4) are first charged into a sedimentation separation tank (11). Here, the intermediate water separated into solid and liquid flows into the contact aeration tank (31) for aerobic treatment, and is subjected to treatment by aerobic microorganisms. A furnace material (311) is built in the contact aeration tank (31), and an air blower (312) is provided.
And air from the air diffuser (313). In this example, the water subjected to the aerobic treatment is guided to the disinfection tank (5) via the sedimentation tank (6), and is discharged to the outside as discharge water (C).

The furnace material (31) in the contact aeration tank (31)
1) may be any commonly used one such as a corrugated sheet, a net-like, a spherical, a plastic pipe, a string-like body, and the like. Instead of the contact aeration tank (31), an apparatus using an activated sludge method for aerobic treatment may be employed. Sludge remaining in the contact aeration tank (31) is returned to the sedimentation separation tank (11) by the sludge return pump (314) and the sludge return pipe (315).

On the other hand, sludge generated and deposited in the sedimentation separation tank (11) (solid content in influent water and returned sludge)
Is a sludge transfer pipe (111) and a sludge transfer pump (11).
It is transferred to the sludge decomposition tank (21) by 2). The sedimentation separation tank (11) has a function of storing sludge, and a part thereof is expected to be reduced by anaerobic decomposition. Regarding the transfer of the sludge to the sludge decomposition tank (21), the sludge can be periodically transferred at a constant rate. Of course, the transfer may be performed at any time, but it is preferable to periodically transfer the fixed amount to control the load in the sludge decomposition tank (21).

The transferred sludge is agitated and mixed with the wood strip (211) in the sludge decomposition tank (21), and the sludge is aerobically aerated by microorganisms in the tank and in the wood strip (211). Will be processed. The treatment tank itself using the wood strip (211) has already been proposed by the inventors of the present application, but adoption in the merger processing is realized for the first time in the present invention.

For example, the combined septic tank having the above-described structure enables the use of a disposer without increasing the load on the surrounding environment, simplification of garbage disposal, provision of a clean kitchen environment, and generation of garbage. The amount can also be reduced. And, by using a septic tank having a sludge decomposition mechanism, it becomes possible to reduce the size of the sedimentation separation tank (11) required to secure a capacity as a sludge storage function. Therefore, even when the amount of sludge generated due to the use of the disposer increases, there is provided a disposer-compatible combined treatment / purification tank that does not require a large increase in capacity as compared with a conventional tank (non-disposer-compatible). Discharge water quality is also good.

As a result, the amount of sludge generated in the entire apparatus is reduced, so that the frequency of sludge cleaning can be reduced, and the burden of processing and disposal can be reduced. The wood strip (211) used for sludge decomposition can be collected and used for composting. FIG. 4 and FIG. 5 are a configuration sectional view and a processing flow block diagram showing another embodiment. In this example, an anaerobic filter tank (12) is used instead of the sedimentation separation tank (11) in the above example.

In this anaerobic filter tank (12), the filter medium (12
1) is built in, and the separated solids and the returned sludge are separated from the filter medium (121) together with the separation of the solids in the inflow water.
Are stored at the surface and the gap of the tank, and further, at the bottom of the tank.
It is decomposed by anaerobic microorganisms living on the surface and in the gap of the filter medium (121). In the case of the above-mentioned sedimentation separation tank (11), when a large amount of sewage flows at once, the sludge deposited on the bottom is disturbed and the solid-liquid separation function is lowered, and the sedimentation separation tank (11) is transferred to the subsequent aerobic treatment tank. Although it is conceivable that the inflow of solids increases and the quality of the treated water becomes unfavorable in the end, such a concern does not arise when the anaerobic filter tank (12) is used as in this example. .

That is, by using the anaerobic filter tank (12) as the primary treatment device, the solid content in the inflow water can be reduced by the filter medium (1).
21), the solid-liquid separation ability can be higher than the method using the precipitation separation tank (11). Therefore, the quality of the water flowing into the aerobic treatment tank at the subsequent stage is stable, and a good quality of treated water can be stably obtained. Since the anaerobic microorganisms are maintained on the surface of the filter medium (121) and the filter medium gap filled in the anaerobic filter tank (12), the amount of microorganisms retained per apparatus volume can be increased. For this reason, the anaerobic decomposition ability for the sludge stored in the tank is also improved, and the sedimentation separation tank (11) is used.
It is possible to make it smaller.

FIGS. 6 and 7 show still another example of the present invention. In this example, in the combined septic tank using the anaerobic filter tank (12), the contact aeration tank (3) is used.
A membrane separation activated sludge tank (32) is used instead of 1).
In any of the above examples, as is clear from FIGS. 2 and 4, the separation of the treated water and the sludge (suspended matter) in the sewage treatment process finally causes the particle sedimentation in the sedimentation tank (6). It is considered that the quality of the discharged water depends on the properties of the sludge (suspended matter) particles, and that the treated water quality is also affected by fluctuations in the amount of inflow water. However, in the examples of FIGS. 6 and 7, such a concern is completely eliminated. This is because the final separation of the treated water and the sludge is performed in the membrane separation activated sludge tank (32).

The activated sludge tank for membrane separation (32) has a membrane module (321) and is provided with a suction pump (322) connected thereto. The separation of the treated water and the activated sludge can be effectively performed in a short time by the solid-liquid separation mechanism by the membrane module (321). The treated water that has passed through the membrane module (321) is supplied to the suction pump (32).
It is transferred to the disinfection tank (5) by 2) and finally discharged to the outside. As in the above-mentioned example, the sedimentation tank (6) is not required, and very good and stable discharge water quality can be obtained.

The membrane module (321) may be of various shapes and materials such as a hollow fiber membrane, a flat membrane, and a nonwoven fabric membrane. In addition, a suction pump (32
Instead of 2), a membrane separation method using a pressure difference due to a head difference may be configured. In any case, the aerobic treatment tank in the sewage treatment process includes a membrane separation activated sludge tank (32).
Because of the use of the above, the sedimentation tank (6) is not required, and very good and stable effluent water quality can be obtained with a compact device.

By employing the membrane separation activated sludge method, it is possible to operate at a high activated sludge concentration, to maintain a high concentration of microorganisms, and to increase the treatment efficiency, so that the apparatus becomes compact and the sedimentation tank (6) Since it is not necessary, the apparatus can be made compact. The treated water quality is good and stable without being affected by the sludge settling property. Even organisms with a slow growth rate such as nitrifying bacteria can maintain a high concentration.

Furthermore, since bacteria can be removed by membrane separation, sanitary treated water can be obtained. Of course, the invention of this application is not limited to the above-described examples, and various aspects of the details are possible.

[0025]

As described above in detail, in the combined clarification tank compatible with the disposer according to the present invention, which uses the sludge decomposition tank together with the separation tank and the aerobic treatment tank, the disposer can be used without increasing the load on the surrounding environment. Garbage can be easily processed, a clean kitchen environment can be provided, and the amount of garbage generated can be reduced.

By using a septic tank having a sludge decomposing mechanism, it is possible to reduce the size of a separation tank required to secure a capacity as a sludge storage function. for that reason,
Even with the increase in sludge generation due to the use of disposers,
A disposer-compatible merger / purification tank that does not require a large capacity increase compared to a conventional tank (non-disposer-compatible) is provided.

For this reason, the amount of sludge generated in the entire apparatus is reduced, so that the frequency of sludge cleaning can be reduced and the burden of processing and disposal can be reduced. When an anaerobic bed tank is used as the separation tank, the solid content in the inflow water is captured by the filter medium, so the solid-liquid separation capacity is increased, and therefore, the quality of the water flowing into the aerobic treatment tank at the subsequent stage is stable. And good treated water quality can be stably obtained.

Since the anaerobic microorganisms are maintained on the surface of the filter medium and the space between the filter media filled in the anaerobic filter tank, the amount of microorganisms retained per unit volume of the apparatus can be increased, and the anaerobic decomposition ability against the sludge stored in the tank is also improved. It is possible to make the separation tank smaller. Furthermore, when a membrane separation activated sludge tank is used as the aerobic treatment tank, operation at a high activated sludge concentration is possible, so that the concentration of microorganisms can be maintained high and the treatment efficiency is increased, so the equipment becomes compact and the equipment becomes compact. Becomes possible. The treated water quality is good and stable without being affected by the sludge settling property.

Even organisms with a slow growth rate such as nitrifying bacteria can maintain a high concentration. Furthermore, bacteria can be removed by membrane separation, so that sanitary treated water can be obtained.

[Brief description of the drawings]

FIG. 1 is a block diagram illustrating a configuration and a processing flow of a combined septic tank according to the present invention.

FIG. 2 is a configuration sectional view as an example.

FIG. 3 is a block diagram illustrating a processing flow of FIG. 2;

FIG. 4 is a sectional view showing the configuration of another embodiment using an anaerobic filter tank.

FIG. 5 is a block diagram illustrating a processing flow of FIG. 4;

FIG. 6 is a sectional view showing the configuration of still another embodiment using a membrane separation activated sludge tank.

FIG. 7 is a block diagram illustrating a processing flow of FIG. 6;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Separation tank 2 Sludge decomposition tank 3 Aerobic treatment tank 4 Disposer 5 Disinfection tank 6 Sedimentation tank 11 Sedimentation separation tank 111 Sludge transfer pipe 112 Sludge transfer pump 21 Sludge decomposition tank 211 Wood strip 212 Stirring motor 31 Contact aeration tank 311 Furnace material 312 Air blower 313 Aeration pipe 314 Sludge return pump 315 Sludge return pipe 12 Anaerobic filter bed 121 Filter medium 32 Membrane separation activated sludge tank 321 Membrane module 322 Suction pump A Disposer wastewater B Domestic wastewater C Discharge water

────────────────────────────────────────────────── ─── Continued on the front page (51) Int.Cl. ⁶ Identification code FI C02F 3/12 C02F 11/02 ZAB 11/02 ZAB B09B 3/00 ZABD (72) Inventor Koji Minami 1048 Okadoma, Kadoma, Osaka No. Matsushita Electric Works, Ltd. (72) Shin Shin, the inventor, No. 1048, Kadoma, Kazuma, Osaka Prefecture Matsushita Electric Works, Ltd.

Claims (8)

[Claims] 1. A combined disposer / purification tank for purifying wastewater from a disposer for disposing of garbage together with domestic wastewater, comprising a separation tank, a sludge decomposition tank, and an aerobic treatment tank. A sludge separated in the separation tank is transferred to a sludge decomposition tank to be subjected to aerobic treatment, and is subjected to a decomposition treatment. 2. The combined clarification tank according to claim 1, wherein the separation tank is a sedimentation separation tank for separating solids in inflow sewage. 3. The decomposition treatment tank is filled with wood chips as a microorganism carrier together with a moisture regulator, and the sludge is stirred and mixed with the wood chips in the decomposition treatment tank to be biologically treated. The combined septic tank according to claim 1. 4. The combined septic tank according to claim 1, further comprising a sludge return pipe for returning sludge from the aerobic treatment tank to the separation tank. 5. The combined clarification tank according to claim 1, wherein the separation tank is an anaerobic hearth tank having a function of anaerobic biodegradation of solids and sludge. 6. The aerobic treatment tank is a contact aeration tank.
Merger of septic tanks. 7. The combined septic tank according to claim 1, wherein the aerobic treatment tank is an activated sludge treatment tank. 8. The combined septic tank according to claim 7, wherein the aerobic treatment tank is a membrane separation activated sludge tank.