JPH11138184A - Septic tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a septic tank incorporated an airlift pump capable of maintaining stable pumping up and a stable circulation water quantity for a long period. SOLUTION: In the septic tank 1 arranged from the upstream side in order of an anaerobic filter bed tank, an aerobic filter bed tank, a precipitation tank 9 or a treating water tank 12 and a sterilized tank 10 partitioned the tank inside with partitioning walls, a transferring device for circulating the tank water in the anaerobic filter bed tank, the precipitation tank 9 or the treated water tank 12 to the anaerobic filter bed tank is on an airlift pump system, and a movable body 24 for automatically washing the vertical pipe inside is provided in the vertical pipe of the airlift pump 13 and also the circulation water 18 lifted with the airlift pump 13 is transferred to the anaerobic filter bed tank.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

TECHNICAL FIELD The present invention relates to a small-scale septic tank for treating night soil and gray water of a detached house,
The present invention relates to a transfer device used for circulating water in a tank.

[0002]

2. Description of the Related Art A conventional septic tank will be described with reference to FIG.
The anaerobic filter bed first chamber 6, the anaerobic filter tank second chamber 7, the contact aeration tank 8, the sedimentation tank 9,
The disinfection tank 10 is arranged in this order. In FIG. 5,
When the contact aeration tank 8 is the biological filtration tank 11, the settling tank 9 is arranged as the treated water tank 12. In the following description,
Since both the contact aeration tank 8 and the biological filtration tank 11 are subjected to aerobic treatment, they may be collectively referred to as an aerobic filter bed tank. The septic tank 1 is an aerobic filter bed tank or a sedimentation tank 9 or a treated water tank 1 for the purpose of stabilizing treated water quality and denitrification.
The method of circulating (returning) the water in the tank 2 to the first chamber 6 of the anaerobic filter tank is adopted in many cases.

[0003] In the above-mentioned septic tank 1, the amount of water circulating the water in the aerobic filter bed tank or the sedimentation tank 9 or the treatment water tank 12 is extremely small (several liters / minute). It cannot be used and is pumped and circulated using an air lift pump 13 using air as a propulsion force.

As shown in FIG. 6, the pumping mechanism of the air lift pump 13 is such that air 15 is inserted through an inner pipe 14 of a standing pipe, discharged from the bottom of the inner pipe 14, and connected to an outer pipe 16 of the standing pipe. The space between the inner tube 14 and the inner tube 14 is raised. At this time, the water 17 in the tank outside the air lift pump 13 is also sucked and can be pumped up. A distributing and measuring device 21 including a triangular weir 19 for measuring the required amount of circulating water 18 and a return weir 20 for adjusting the amount of circulating water is provided above the standing pipe. That is, the distribution metering device 21 causes the pumped water advancing from the standing pipe to overflow the required amount of the circulating water 18 from the triangular weir 19 and return the surplus water 22 from the return weir 20 to the original tank. .

Further, as shown in FIG. 7, a method has been proposed in which the air lift pump 13 pumps only a required amount of circulating water 18. That is, the outer tube 1 of the standing tube
The suction port of No. 6 is provided with a throttle portion 23 which serves as a pumping resistance,
The whole pumped amount is transferred as circulating water 18.

[0006]

However, if the operation of the septic tank is continued, the air lift pump 13 provided with the distributing and weighing device 21 or the air lift pump 13 provided with the throttle portion 23 in the outer tube 16 is connected to the outer tube 16. Inner wall, inner tube 14
Since the SS (suspended suspended solids) contained in the pumped water gradually adheres to the outer wall of the pump or a biofilm is formed (hereinafter, these are referred to as adhering sludge), the pumping capacity is reduced. Therefore, there is a problem that stable pumping and circulating water cannot be maintained.

SUMMARY OF THE INVENTION In view of the above problems, an object of the present invention is to provide a septic tank capable of performing a stable transfer by adding a function of automatically cleaning the inside of a vertical pipe of an air lift pump.

[0008]

According to the present invention, as shown in FIG. 4, the inside of the tank is partitioned by a partition wall, and an anaerobic filter bed tank is provided from the upstream side.
In the purification tank 1 arranged in the order of the aerobic filter bed tank, the sedimentation tank 9 or the treatment water tank 12, and the disinfection tank 10, the water in the aerobic filter bed tank, the sedimentation tank 9 or the treatment water tank 12 is circulated to the anaerobic filter bed tank. The moving device is an air lift pump type, and a movable body 24 for automatically cleaning the inside of the vertical pipe is provided in the vertical pipe of the air lift pump 13.

[0009]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS The amount of water pumped by the air lift pump 13 is determined by the immersion depth between the water surface and its lower end, the pipe diameter, the head, and the amount of air. Sludge adheres to the inner wall of the outer pipe and the outer wall of the inner pipe of the air lift pump 13, and the amount of pumped water decreases. Therefore, according to the present invention, as shown in FIGS. 1 and 2, the movable body 24 is attached to the inner pipe 14 of the air lift pump 13 and the movable body 24 is moved up and down to remove sludge adhering to the pipe. Cleaning. It is necessary that the movable body 24 has a specific gravity such that it falls under its own weight when the air 15 stops and rises by the propulsion force of the air and the pumping water at the time of insertion.

More specifically, as shown in FIG. 3, the movable body 24 is mounted on the inner tube 14 which is mounted inside the outer tube 16.
The movable body 24 is supported by a stopper 25 provided at the lower end of the inner pipe 14, and the movement of the movable body 24 is controlled by stopping and inserting the air 15 acting on the air lift pump 13. That is, the movable body 24 is at the position of the stopper 25 when the air 15 is stopped, and when the air 15 is inserted, the outer tube 1 is moved.
The air and pumping water rising between the inner pipe 6 and the inner pipe 14 are pushed upward by the propulsive force, and are held at the upper part. When the air 15 stops, the air 15 falls from the upper part to the stopper 25 at the lower end. At this time, the movable body 24 moves while separating the sludge adhering to the inner wall of the outer tube 16 and the outer wall of the inner tube 14, so that the sludge can be prevented from adhering.

The operation for inserting and stopping the air 15 is as follows.
The operation is performed by a timer command, and the blower is periodically stopped for a certain period of time by the timer, or the blower is continuously operated, and the solenoid valve in the path of the air 15 to be inserted is periodically closed for a certain period of time. The time for stopping the blower or closing the solenoid valve in the path of the air 15 may be set to be equal to or longer than the time required for the movable body 24 to fall from the upper portion to the position of the stopper 25 at the lower end. However, if it is longer than necessary, the stop time of the circulating water becomes longer, which is not preferable for the processing performance. Therefore, the stop time is preferably about 30 minutes or less.

When the circulating water 18 pumped by the air lift pump 13 has a plurality of anaerobic filter tanks, the circulating water 18 may be transferred to the first anaerobic filter tank closest to the inflow port in order to lengthen the treatment time. preferable.

[0013]

An embodiment of the present invention will be described with reference to the drawings. The septic tank 1 shown in FIG. 4 has partition walls 2, 3, 4,
5, the anaerobic filter bed first chamber 6, the anaerobic filter tank second chamber 7, the contact aeration tank 8, the sedimentation tank 9, and the disinfection tank 10 from the upstream side.
Are arranged in this order. The anaerobic filter tank first chamber 6 and the anaerobic filter tank second chamber 7 are provided with a filter medium 26, and the contact aeration tank 8 is provided with a microorganism adherent 27.

The sewage 29 flowing into the first anaerobic filter tank 6 from the inlet 28 is supplied to the second anaerobic filter tank 7 and the contact aeration tank 8.
Then, it is sterilized in the disinfecting tank 10 through the sedimentation tank 9, and discharged out of the system as treated water 31 from the outlet 30. Part of the water in the tank from the bottom of the settling tank 9 is pumped up by an air lift pump 13 for stabilization and denitrification of the treated water quality, and is circulated to a first anaerobic filter bed tank 6 by a transfer pipe 32. A blower 33 is connected to the air lift pump 13, and the blower 33 is controlled by a timer 34 so as to stop once a day for 5 minutes.

As shown in FIG. 2, the air lift pump 13 includes an outer tube 16 having a throttle portion 23 at the lower end, and an inner tube 14 having a stopper 25 at the lower end inside the outer tube 16.
The inner tube 14 is provided with a movable body 24. When the air 15 is inserted, the movable body 24 is pushed upward by the driving force of the air and the pumping water, and at this time, the sludge attached to the wall surface is separated. The separated sludge is mixed into the circulating water 18 and transferred to the first anaerobic filter bed tank 6. The blower 33 is stopped and the air 15
When the insertion of the movable body 24 is stopped, the movable body 24 falls to the position of the stopper 25 by its own weight, but also at this time, the sludge attached to the wall surface can be removed.

[0016]

As described above, conventionally, sludge adhered to the pipe of the air lift pump, and the amount of circulating water could not be shifted stably. However, according to the present invention, the vertical pipe was inserted into the pipe of the air lift pump. Since the movable body for automatically cleaning is provided, stable circulation can be maintained and the quality of the treated water in the septic tank can be stabilized.

[Brief description of the drawings]

FIG. 1 is a sectional view showing an embodiment of an air lift pump which is a main part of the present invention.

FIG. 2 is a sectional view showing an embodiment of another air lift pump which is a main part of the present invention.

FIG. 3 is a perspective view showing details of a movable body shown in FIGS. 1 and 2;

FIG. 4 is a sectional view showing a septic tank according to the present invention.

FIG. 5 is a sectional view showing a conventional septic tank.

FIG. 6 is a perspective view showing a conventional air lift pump.

FIG. 7 is a sectional view showing another conventional air lift pump.

[Explanation of symbols]

1. Septic tank 2. Partition wall 3. Partition wall 4. Partition wall
5. Partition wall 6. Anaerobic filter tank 1st room 7. 7. Anaerobic filter tank 2nd room Contact aeration tank 9. Settling tank 10. Disinfection tank
11. Biological filtration tank 12. Treated water tank 13. Air lift pump 14. Inner tube 15. Air 16. Outer tube 17. Water in tank 18. Circulating water 19. Triangular weir 20. Return weir 21. Dispensing and weighing device
22. Surplus water 23. Restrictor 24. Movable body 25. Stopper 26. Filter medium 27. Microbial adherent
28. Inlet 29. Sewage 30. Outlet 31. Treated water 32. Transition pipe 33. Blower 34. timer

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Yasuri Wada Shimodate City, Ibaraki Pref.

Claims (1)

[Claims] 1. A purification tank in which a tank is partitioned by a partition wall and an anaerobic filter tank, an aerobic filter tank, a sedimentation tank or a treated water tank, and a disinfection tank are arranged in this order from the upstream side, The transfer device for circulating the water in the sedimentation tank or the treatment water tank to the anaerobic filter bed tank is an air lift pump system, and a movable body for cleaning the inside of the vertical pipe is provided in the vertical pipe of the air lift pump. Septic tank.