JPH0739898A - Sewage treating device - Google Patents

Abstract

PURPOSE:To provide a sewage treating device having backwashing equipment which is simple in equipment constitution and is easy to maintain and inspect. CONSTITUTION:This sewage treating device has an anaerobic treating vessel 1, an aerobic treating vessel 2 having a filter bed 3 disposed in communication with a flow transfer pipe 4 with a check valve on its downstream side, a settling vessel 5 disposed on the downstream side thereof and a release vessel 8 having a release pipe 14 disposed in communication with an overflow pipe 10 on the downstream side thereof, etc. The treating device has a water flow pipe 17 which is mounted on a submersible pump 11 disposed in the bottom of the release vessel 8 and opens the waste water, etc., in the release vessel 8 via the settling vessel 5 to the lower part of a filter bed 3 disposed in the aerobic treating vessel 5. The device has the constitution provided with a settling vessel inflow port 18 with a check valve for allowing the sewage, etc., in the aerobic treating vessel 2 to flow over to the water communicating pipe 17 penetrated in the settling vessel 5 and a release vessel inflow blocking section 17a disposed in a position higher than the settling vessel inflow port 18 with the check valve on the downstream side thereof.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage treatment apparatus having an aerobic treatment tank equipped with a filter bed, a precipitation tank, a discharge tank and the like.

[0002]

2. Description of the Related Art In recent years, due to an increase in the amount of sewage treatment, the sewage treatment facilities that have been used up to now are running out of capacity, and along with this, sewage treatment equipment for public facilities such as schools and hospitals and collective housing such as condominiums. The number of places to introduce is increasing. In addition, the current situation is to encourage the installation of sewage treatment equipment publicly and by providing financial assistance to sewage treatment equipment. Under such circumstances, in a sewage treatment apparatus having an aerobic treatment tank equipped with a filter bed, sludge deposits and adheres to the filter bed on which aerobic microorganisms are fixed, so an operation to wash this filter bed is indispensable. .

A conventional sewage treatment apparatus will be described below. FIG. 4 is an internal configuration diagram of a conventional sewage treatment apparatus. 1
Is an anaerobic treatment tank for decomposing organic matter such as sewage with anaerobic microorganisms, 2 is an aerobic treatment tank for aerobic decomposition of sewage with aerobic microorganisms, and 3 is an aerobic treatment tank A filter bed for disposing aerobic microorganisms disposed in 2 and 4 are aerobic treatment tanks 2 for treating wastewater and the like anaerobically decomposed in anaerobic treatment tanks 1.
Advection pipe with check valve for inflow to the aerobic treatment tank 2
A sedimentation tank for adsorbing sewage and the like that is aerobically decomposed in the aerobic treatment tank 2 and partially separated, and 6 is incorporated in the central portion of the sedimentation tank 5 to adsorb the sewage and the like from the aerobic treatment tank 2. A center well for sending the water through the pipe 7 to the central deep part of the precipitation tank 5, 8 is a discharge tank for temporarily collecting the waste water purified by the precipitation tank 5, and 9 is a certain amount of the waste water purified by the precipitation tank 5. In this case, an overflow is provided for flowing out to the discharge tank 8 through the overflow pipe 10, 11 is a backwashing submersible pump provided at the bottom of the discharge tank 8, and 12 is drainage accumulated in the discharge tank 8. Is sent to the bottom of the aerobic treatment tank 2 as backwash water, 13 is a pump outlet check valve arranged at the end of the backwash tube 12 on the submersible pump 11 side, and 14 is of the discharge tank 8. A discharge pipe provided at a position lower than the overflow pipe 10 for discharging the waste water to the outside of the system, and 15 is an aerobic treatment tank for the advection pipe 7. Electric valve for closing during backwashing is disposed on the side, 16 is the backwash water advection tube for delivering the backwash water aerobic treatment tank 2 during backwashing to another tank.

The operation of the conventional sewage treatment apparatus constructed as above will be described below. Usually, when treating sewage and the like, the sewage and the like are first subjected to microbial treatment in the anaerobic treatment tank 1 to decompose organic substances and the like. Next, anaerobic treatment tank 1
The sewage and the like from the above flows into the aerobic treatment tank 2 through the advection pipe 4 with a check valve. Sewage flowing into the aerobic treatment tank 2 is aerobically decomposed by aerobic microorganisms fixed on the filter bed 3, and sludge is deposited and adhered on the filter bed 3. Further, the aerobically decomposed sewage or the like passes through the advection pipe 7 and the center well 6 to flow into the central deep portion of the precipitation tank 5. When the amount of wastewater separated by settling in the settling tank 5 reaches a predetermined amount, it flows over the overflow weir 9 and flows into the discharge tank 8 through the overflow pipe 10. The wastewater that has flowed into the discharge tank 8 is temporarily stored here, and if it exceeds a predetermined amount, it is naturally discharged from the discharge pipe 14 to the outside of the system. In the sewage treatment process, the sludge decomposed by aerobic microorganisms is deposited and adhered to the filter bed 3 in the aerobic treatment tank 2. Therefore, in order to improve the treatment efficiency and maintain the water quality of the wastewater at a constant level, 3 needs to be washed. In this case, the drainage accumulated in the discharge tank 8 is pumped up using the submersible pump 11 and passed through the backwash pipe 12, and the aerobic treatment tank 2
The filter bed 3 is sent to the bottom of the filter bed 3 as backwash water to wash the filter bed 3. At this time, the backwash water in the aerobic treatment tank 2 does not flow into the precipitation tank 5 by closing the electric valve 15. Further, the reverse flow with the check valve does not reverse the flow to the anaerobic treatment tank 1 on the upstream side, and the water is sent to another tank through the backwash water transfer pipe 16.

[0005]

However, in the above-mentioned conventional structure, when the filter bed 3 is washed, the backwash water is the settling tank 5.
Motor valve 1 that operates in conjunction with the submersible pump 11 at the end of the advection pipe 7 on the side of the aerobic treatment tank 2 in order to prevent it from flowing into the
Therefore, there is a problem in that the equipment structure is complicated and the maintenance and inspection requires a lot of labor.

The present invention solves the above problems, and an object of the present invention is to provide a sewage treatment apparatus equipped with a backwash facility having a simple facility configuration and easy maintenance.

[0007]

In order to achieve this object, the sewage treatment apparatus according to claim 1 of the present invention communicates with an anaerobic treatment tank and a downstream side of the anaerobic treatment tank by a convection pipe with a check valve. An aerobic treatment tank having a filter bed disposed in parallel, a precipitation tank disposed downstream of the aerobic treatment tank, and a discharge pipe disposed in communication with an overflow pipe downstream of the precipitation tank. A sewage treatment apparatus having a discharge tank, etc., which is equipped with a submersible pump provided at the bottom of the discharge tank, and discharges wastewater in the discharge tank through the settling tank into the aerobic treatment tank. Having a water passage pipe that opens at the lower part of the filter bed disposed in the above, and a reverse washing pipe that penetrates into the settling tank causes the sewage of the aerobic treatment tank to overflow into the settling tank. A settling tank inlet with a check valve and a position higher than the settling tank inlet with a check valve downstream of the settling tank inlet with a check valve Has a Nagareso inlet blocking portion, the configuration with. The sewage treatment apparatus according to a second aspect of the present invention has a configuration in which the discharge tank inflow prevention section is provided with an air suction port in the first aspect. The sewage treatment apparatus according to claim 3,
According to a second aspect of the invention, a solenoid valve is arranged at the air suction port.

Here, the discharge tank inflow prevention part is higher than the settling tank inlet with a check valve when sewage from the aerobic treatment tank flows into the settling tank through the settling tank with a check valve. A water pipe is installed at a position to prevent it from flowing into the discharge tank. If it is on the downstream side (release tank side) of the settling tank with check valve (release tank side), it will be inside the settling tank or inside the discharge tank. However, when the air suction port is provided, it is preferably disposed above the discharge tank. This is because the air inlet has a smaller diameter than the water pipe and thus does not affect the water supply to the aerobic treatment tank, but there is a slight water leakage through the air inlet. After cleaning the filter bed of the aerobic treatment tank, the air suction port prevents some backwash water from the aerobic treatment tank from flowing back to the discharge tank due to the siphon phenomenon due to the difference in water level between the aerobic treatment tank and the discharge tank. To prevent.

[0009]

With this configuration, the backwash water can be fed from the discharge tank to the aerobic treatment tank with a single water pipe and the backwash water can be sent from the discharge tank to the sedimentation tank of the aerobic treatment tank. When flowing into the discharge tank, the discharge tank inflow blocking portion arranged at a position higher than the settling tank with a check valve can prevent sewage and the like from flowing into the discharge tank. Further, during washing of the filter bed, the internal pressure in the backwash pipe can prevent the wastewater in the discharge tank from flowing into the settling tank by the inlet port of the settling tank with a check valve. Further, the air suction port and the solenoid valve can prevent backflow of backwash water from the aerobic treatment tank to the discharge tank at the end of cleaning.

[0010]

【Example】

(First Embodiment) A first embodiment of the present invention will be described below with reference to the drawings. FIG. 1 is an internal configuration diagram of a sewage treatment apparatus according to the first embodiment of the present invention. 1 is an anaerobic treatment tank, 2 is an aerobic treatment tank, 3 is a filter bed, 4 is a convection tube with a check valve, 5 is a precipitation tank, 6 is a center well, 8 is a discharge tank, 9
Is an overflow pipe, 10 is an overflow pipe, 11 is a submersible pump, 14 is a discharge pipe, and 16 is a backwash water advection pipe. Since these are similar to the conventional example, the same reference numerals are given and description thereof is omitted. To do.
Reference numeral 17 denotes a water pipe having a settling tank inlet 18 with a check valve arranged above the center well 6 in the settling tank 5, and 17a is a discharge tank arranged at a position higher than the settling tank inlet 18 with a check valve. It is an inflow block.

Usually, when purifying sewage and the like, sewage and the like that has flowed into the aerobic treatment tank 2 from the anaerobic treatment tank 1 through the advection pipe 4 with a check valve is aerobically treated after passing through the filter bed 3. With a check valve provided above the center well 6 in the precipitation tank 5 in the form of overflow so as to enter the water pipe 17 from the end opening at the bottom of the aerobic treatment tank 2 and to flow backward through the water pipe 17. It flows into the central deep portion of the precipitation tank 5 through the precipitation tank inflow port 18. Sewage that has flowed into the settling tank 5 separates sludge that has been partly separated, and only the upper drainage that has overflowed the overflow overflow 9 flows into the discharge tank 8 through the overflow pipe 10. The wastewater is temporarily stored in the discharge tank 8 and then discharged to the outside of the system through the discharge pipe 14 in the form of overflow. Here, the discharge tank inflow blocking portion 17a above the discharge tank 8 is arranged at a position higher than the settling tank inlet port 18 with a check valve, which is arranged above the center well 6 in the precipitation tank 5. Sewage and the like in the aerobic treatment tank 2 does not directly flow into the discharge tank 8 through the water pipe 17. On the other hand, when washing the filter bed 3 in the aerobic treatment tank 2, the drainage and the like accumulated in the discharge tank 8 is activated as a backwash water by activating the subwashing pump 11 for backwashing provided at the bottom of the discharge tank 8. Water is sent to the lower part of the filter bed 3 in the aerobic treatment tank 2 through the water pipe 17. At this time, since the settling tank with check valve inlet 18 is closed by the internal pressure of the water pipe 17, backwash water does not flow into the settling tank 5.

The backwash water in the aerobic treatment tank 2 is sent from the backwash water advection pipe 16 to another tank as in the conventional example. After washing
There may be some backwash water or the like in the aerobic treatment tank 2 that flows back to the discharge tank 8 due to the siphon phenomenon, but the inside of the aerobic treatment tank 2 has been sufficiently washed and sewage and the like from the backwash water advection pipe 16 As it is discharged to the tank of, there is almost no effect.

As described above, according to the present embodiment, when the filter bed 3 in the aerobic treatment tank 2 is washed, the discharge tank is constructed with a simple equipment structure without using an electric valve or the like linked with the submersible pump 11. The filter bed 3 in the aerobic treatment tank 2 can be backwashed by utilizing the drainage and the like in 8.

(Second Embodiment) A second embodiment of the present invention will be described below with reference to the drawings. FIG. 2 is an internal configuration diagram of a wastewater treatment device according to the second embodiment of the present invention. The difference from the first embodiment is that an air suction port 19 is provided in the discharge tank inflow prevention portion 17a of the water pipe 17 above the discharge tank 8. Here, the air suction port 19 has a smaller diameter than the water pipe 17, and does not affect the operation of the backwash water and the operation of the settling tank inlet 18 with a check valve, although it does not affect the check valve. Is more preferable. The method of purifying and backwashing the dirty water is the same as that of the first embodiment, but immediately after the backwashing is completed, the air flows in through the air suction port 19 so that the water level difference between the aerobic treatment tank 2 and the discharge tank 8 is increased. The backwash water from the aerobic treatment tank 2 to the discharge tank 8 can be prevented from backflowing due to the siphon phenomenon caused by.

(Embodiment 3) A third embodiment of the present invention will be described below with reference to the drawings. FIG. 3 is an internal block diagram of a wastewater treatment apparatus in the third embodiment of the present invention. The difference from the first embodiment is that a solenoid valve 20 is provided at the air suction port 19 of the discharge tank inflow prevention portion 17a located above the discharge tank 8. Before backwashing, the electromagnetic valve 20 is closed, the submersible pump 11 is activated to perform backwashing, and when the backwashing is completed, the submersible pump 11 is stopped and then the solenoid valve 20 is opened. Therefore, air flows into the water pipe 17, and the second embodiment
Similarly, the backflow of backwash water from the aerobic treatment tank 2 to the discharge tank 8 due to the siphon phenomenon can be prevented. Other operations are the same as in the first embodiment.

As described above, according to this embodiment, the filter bed 3 in the aerobic treatment tank 2 can be easily washed by utilizing the drainage of the discharge tank 8 with a simple equipment structure. Further, it is possible to prevent the backwash water from flowing back from the aerobic treatment tank 2 to the discharge tank 8.

[0017]

As described above, the sewage treatment apparatus of the present invention is 1
Since it is possible to use the book water pipe to carry inflow of sewage etc. into the settling tank and to send backwash water for cleaning to the aerobic treatment tank,
It is possible to realize a sewage treatment device suitable for mass production with low cost and high purification efficiency, with simple piping equipment and excellent maintainability without the need for motorized valves, advection pipes, and control devices that control these operations. .

[Brief description of drawings]

FIG. 1 is an internal configuration diagram of a sewage treatment apparatus according to a first embodiment of the present invention.

FIG. 2 is an internal configuration diagram of a sewage treatment apparatus according to a second embodiment of the present invention.

FIG. 3 is an internal configuration diagram of a sewage treatment apparatus according to a third embodiment of the present invention.

FIG. 4 is an internal configuration diagram of a conventional sewage treatment apparatus.

[Explanation of symbols]

 1 Anaerobic treatment tank 2 Aerobic treatment tank 3 Filter bed 4 Advection tube with check valve 5 Sedimentation tank 6 Center well 7 Advection tube 8 Discharge tank 9 Overflow weir 10 Overflow tube 11 Submersible pump 12 Backwash tube 13 Pump outlet reverse Stop valve 14 Outlet pipe 15 Motorized valve 16 Backwash water advection pipe 17 Water pipe 17a Outlet tank inflow blocker 18 Settling tank inlet with check valve 19 Air inlet 20 Solenoid valve

Claims (3)

[Claims] 1. An aerobic treatment tank having a filter bed which is arranged in communication with the anaerobic treatment tank and a downstream side of the anaerobic treatment tank by a convection pipe with a check valve, and is arranged downstream of the aerobic treatment tank. A sewage treatment apparatus having a settling tank and a discharge tank, etc., which is provided in communication with an overflow pipe on the downstream side of the settling tank and is equipped with a discharge pipe, and is provided at the bottom of the discharge tank. A submersible pump is attached to the settling tank, and drainage and the like in the discharge tank is opened through the settling tank to the lower part of the filter bed disposed in the aerobic treatment tank. The settling tank inlet with a check valve for overflowing the wastewater of the aerobic treatment tank into the settling tank through the water passage, and the check valve downstream of the settling tank inlet with the check valve A sewage treatment apparatus comprising a discharge tank inflow prevention section arranged at a position higher than an attached precipitation tank inlet. 2. The sewage treatment apparatus according to claim 1, wherein the discharge tank inflow prevention portion is provided with an air suction port. 3. The sewage treatment apparatus according to claim 2, wherein an electromagnetic valve is provided at the air suction port.