JPH10337584A - Sewage treatment tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a sewage treatment tank in which a piping in the tank is simplified and circulation water can be transferred in a stable manner without using a flow rate adjusting pit. SOLUTION: In the sewage treatment tank 50, the interior thereof is divided by partition walls 1, 2, 3 to provide from the upstream side a first anaerobic filter bed tank room 4, a second anaerobic filter bed room 5, an aerobic filter bed tank 6, a treatment water tank 7, and a sterilization tank 8 in series. There are provided a horizontal pipe 23 and a transfer pipe 20 connected to the pipe 23 are provided to transfer circulation water and washing discharge water from the bottom of the tank 6 or the bottom of the tank 7 to the room 4. In this case, a circulation internal pipe and a washing internal pipe connected to a blower are provided in the pipe 20.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a sewage treatment tank used for purifying human wastewater and domestic wastewater.

[0002]

2. Description of the Related Art A conventional sewage purifying tank will be described with reference to FIG. 4. The inside of a sewage purifying tank 50 is partitioned by partition walls 1, 2, and 3, and an anaerobic filter tank 1st chamber from the upstream side. 4. Anaerobic filter tank second chamber 5, aerobic filter tank 6, and treated water tank 7
And a disinfection tank 8 is provided in a part of the treatment water tank 7. A circulating water transfer pipe 38 is provided at the outlet of the aerobic filter bed tank 6.
A vertical pipe (transfer pipe 20) is installed, and a part of the effluent (hereinafter referred to as circulating water) of the aerobic filter tank 6 is transferred to the anaerobic filter tank first chamber 4 by an air lift pump. During the transfer, the flow rate is adjusted by a triangular weir 41 of a flow rate adjusting mass 40 (see FIG. 5) provided above the transfer pipe 20 of the circulating water transfer pipe 38, and then transferred. The reason why the circulating water is transferred using the circulating water transfer pipe 38 is to return the nitrified circulating water to the anaerobic filter bed tank first chamber 4 for denitrification, thereby achieving stable sewage treatment. Is made possible.

[0003] The aerobic filter bed tank 6 has an aeration section 1 at the top.
6 is installed, and the filtration unit 17 is installed at the lower part. When the sewage purification tank 50 is continuously operated, the filtration unit 17 is closed, so that it is necessary to perform regular cleaning. Washing wastewater generated during the washing is withdrawn from between the aeration section 16 and the filtration section 17 and transferred to the first anaerobic filter bed tank 4 via the washing wastewater transfer pipe 39.

[0004]

However, the sewage purification tank 50 shown in FIG. 4 requires two horizontally long pipes, a circulating water transfer pipe 38 and a washing drainage transfer pipe 39. There is a problem that becomes complicated. Furthermore, when the circulating water is transferred, the use of the triangular weir 41 causes a problem that sludge adheres to the V notch of the triangular weir 41 and lacks stability.

[0005] The present invention has been made in view of the above-mentioned problems, and simplifies the piping in the sewage purification tank 50,
Even without using the flow regulating mass 40 having the triangular weir 41,
It is an object of the present invention to provide a sewage purification tank 50 capable of stably transferring circulating water.

[0006]

SUMMARY OF THE INVENTION The present invention relates to FIGS.
As shown in the figure, the inside of the tank is partitioned by partition walls 1, 2, and 3, from the upstream side, the anaerobic filter bed first chamber 4, the anaerobic filter tank second chamber 5, the aerobic filter bed tank 6, the treatment water tank 7, and A horizontal pipe 23 which is arranged in the order of a disinfection tank 8 and transfers circulating water and washing wastewater from the bottom of the aerobic filter tank 6 or the bottom of the treatment water tank 7 to the first anaerobic filter tank 1 chamber 4. In the sewage purification tank 50 provided with the transfer pipe 20 connected to the inner pipe, an inner pipe 21 for circulation and an inner pipe 22 for cleaning connected to the blowers 27 and 30 are provided inside the transfer pipe 20.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The circulating water as referred to in the present invention is a part of the effluent from the aerobic filter bed tank 6, and more specifically, the sewage that has passed through the filtration unit 17. Further, the washing drainage indicates sewage used for washing the filtration unit 17.

[0008] In the present invention, what used to be a horizontally long piping of a circulating water transfer pipe and two washing and drainage transfer pipes in the prior art is now described.
By using only one horizontal pipe 23, the sewage purification tank 5
0, the air is intermittently discharged from the circulation inner pipe installed inside the transfer pipe 20 connected to the horizontal pipe 23, and the sucked waste water is entirely transferred to adjust the flow rate. No trout is required.

[0009]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a plan view and a longitudinal sectional view of a sewage purification tank 50 showing one embodiment of the present invention. The inside of the tank of the sewage purification tank 50 is separated from an anaerobic filter bed tank by a partition wall 1, 2, and 3 from an upstream side. The first chamber 4, the anaerobic filter bed second chamber 5, the aerobic filter bed tank 6, and the treated water tank 7 are arranged in this order, and a part of the treated water tank 7 is partitioned to provide a disinfecting tank 8. The anaerobic filter tank first chamber 4 and the anaerobic filter tank second chamber 5 contain a filter medium 9 and a filter medium 10, respectively, and the aerobic filter tank 6 is provided with an aeration unit 16 in the upper stage. In addition, the filter unit 17 is arranged in the lower stage, and the air diffusers 18 and 19 are provided below the aeration unit 16 and below the filter unit 17, respectively. The aeration unit 1
6 and the filtering section 17 are filled with granular carriers 14 and 15 made of plastic foam. The aerobic filter bed tank 6 and the treated water tank 7 communicate with each other at the bottom thereof, and a disinfecting tank 8 is provided at the upper portion on the downstream side of the treated water tank 7.

FIG. 2 is an enlarged detail view of a main part of the present invention, and mainly shows a transfer pipe 20 for sucking circulating water and washing wastewater near the bottom of the treated water tank 7. A horizontal pipe 23 is connected to the transfer pipe 20, and an outlet of the horizontal pipe 23 faces the first chamber 4 of the anaerobic filter tank. Further, inside the transfer pipe 20, an inner pipe for circulation 21 connected to the blower 30 and an inner pipe 22 for cleaning connected to the blower 27 are provided.

The treatment of sewage will be described with reference to FIGS. 1 and 2. The sewage is supplied from the inflow port 24 to the first anaerobic filter bed tank.
Upon flowing into the chamber 4 and passing through the filter medium 9, the removal of coarse solids and the decomposition of organic substances by anaerobic microorganisms are performed. The sewage that has passed through the anaerobic filter tank first chamber 4 flows into the anaerobic filter tank second chamber 5 through the advection hole 25, and when passing through the filter medium 10, decomposes organic matter similarly to the anaerobic filter tank first chamber 4. Is performed.

The sewage that has passed through the second anaerobic filter tank 5 flows into the aerobic filter tank 6 through the advection hole 26. In the aerobic filter tank 6, an aerobic microorganism treatment is performed in an aeration section 16 provided at an upper portion thereof, and a filtration treatment is performed in a filtration section 17 provided at a lower portion thereof. The treatment in the aeration section 16 will be described in detail. The aerobic microorganisms attached to the granular carrier 14 filled in the aeration section 16 are supplied from the blower 30 shown in FIG.
With the air supplied via 8, organic matter decomposition and nitrification of ammonia are performed. On the other hand, in the filtration unit 17, during normal operation of the sewage purification tank 50, since there is no air discharge from the air diffuser 19, the filled granular carrier 15 is stationary and serves as a filtration layer. To remove suspended solids generated. Further, the sewage flowing into the filtration unit 17 from the aeration unit 16 maintains an aerobic atmosphere, so that organic matter decomposition and nitrification of ammonia are performed after the aeration unit 16. The sewage flowing out of the aerobic filter tank 6 flows into the treated water tank 7 and is finally discharged from the outlet through the disinfection tank 8.

Next, the circulation of the sewage flowing out of the aerobic filter bed tank 6 will be described with reference to FIG. 2. In the treated water tank 7, a circulation inner pipe 21 connected to the blowers 30 and 27 and a cleaning inner pipe 21 are provided. The pipe 22 is built in, and the blower 30 and the inner pipe 2 for circulation
1 is connected to the solenoid valve 31 linked to the timer 29
Is installed. In the normal operation of the sewage purification tank 50, the electromagnetic valve 31 is closed, and the air from the blower 30
Although the air is discharged only from the air diffuser 18, the electromagnetic valve 31 is periodically opened by the timer 29 to send air to the inner pipe 21 for circulation. When air is discharged from the inner pipe for circulation 21, the transfer pipe 20 serves as an air lift pump, sucks up circulating water, and returns the circulating water to the first anaerobic filter bed tank 4 via the horizontal pipe 23. Becomes The timer 29 determines the operation time from the amount of circulating water returned to the anaerobic filter bed first chamber 4 in advance, so that the entire amount of circulated water sucked up can be returned to the first anaerobic filter bed tank. Thus, there is no need to use a flow control mass.

The washing of the filtration unit 17 in contact with the aerobic filter bed tank 6 will be described. If the sewage purification tank 50 is continuously operated, the filtration unit 17 is gradually closed, so that the backwashing is periodically performed. It is necessary to perform a cleaning called. The cleaning is started by a timer 28, and when the blower 27 is turned on, air is sent to the diffuser pipe 19 installed below the filtration unit 17, and the particulate carrier 15 filled in the filtration unit 17 is bubbled. Due to the bubbling, the floating solid matter captured by the granular carrier 15 is separated from the granular carrier 15. At the same time as the bubbling of the filtration unit 17, the blower 2
7 is also sent to the inner pipe 22 for washing, and
Sewage containing floating solids discharged from the pipe 7
And returned to the first anaerobic filter tank 1 chamber 4.

Another embodiment of the present invention will be described with reference to FIG. 3. The sewage purification tank 50 shown in FIG.
The inner pipe arranged inside the transfer pipe 20 is changed similarly to the sewage purification tank 50 shown in FIG. First, the circulation of sewage will be described. Part of the air discharged from the blower 32 is discharged from the air diffuser 18 provided at the bottom of the aeration section 16 to assist in the decomposition of organic matter in the sewage and nitrification of ammonia. . Further, other air passes through an electromagnetic valve 37 controlled by a timer 35 and is discharged from an inner pipe 33 which also serves to transfer circulating water and washing wastewater, and transfers sewage at the bottom of the treated water tank 7 to the transfer pipe 20 and the horizontal pipe 23. Via anaerobic filter bed tank 1
Return to.

Next, the washing of the filtration unit 17 will be described. When the timer 36 is turned on and the air is exhausted from the blower 34, the air diffusion tube 19 installed below the filtration unit 19 is provided.
Air used for bubbling is discharged. On the other hand, the air diverged without being discharged to the diffuser pipe 19 is discharged from the inner pipe 33 which also serves as circulation and advancing of washing wastewater, and transfers sewage containing suspended solids discharged from the filtration unit 17 by bubbling. Anaerobic filter bed tank 1 via pipe 20 and horizontal pipe 23
Return to room 4. While the blower 34 is operating, there is no problem if the blower 32 is operated at the same time or the operation is stopped.

[0017]

According to the present invention, the conventional circulating water transfer pipe 3
8 and the washing drainage transfer pipe 39 and two transfer pipes are used instead of one horizontal pipe 23, so that the piping can be simplified, and the aerobic filter bed tank 6 By intermittently transferring the total amount of sewage discharged from the sewage, a sewage purification tank that does not use the flow rate adjusting mass 40 can be provided.

[Brief description of the drawings]

FIG. 1 is a plan view and a longitudinal sectional view showing an embodiment of the present invention.

FIG. 2 is an enlarged detail view of a main part showing an embodiment of the present invention.

FIG. 3 is an enlarged detailed view of a main part showing another embodiment of the present invention.

FIG. 4 is a plan view and a longitudinal sectional view showing a conventional example.

FIG. 5 is a perspective view of a flow rate adjusting mass conventionally used.

[Explanation of symbols]

1. Partition wall 2. Partition wall 3. Partition wall 4. 4. Anaerobic filter tank 1st room Anaerobic filter tank 2nd room 6. 6. Aerobic filter bed tank
7. Treated water tank Disinfection tank 9. Filter medium 10. Filter medium 11. Porous member 12. Porous member 13. Porous member 1
4. Granular carrier 15. Granular carrier 16. Aeration part 1
7. Filtration unit 18. Diffuser tube 19. Diffuser 20. Transfer pipe 21. Inner pipe for circulation 22. Inner tube for washing 23. Horizontal pipe 24. Inlet 25. Advection hole 26. Advection hole 27.
Blower 28. Timer 29. Timer 30. Blower 31. Solenoid valve 32. Blower 33. Inner pipe that also serves as advection for circulating water and washing wastewater 34. Blower 3
5. Timer Timer 37. Solenoid valve 38. Circulating water transfer pipe 39. Cleaning drainage transfer pipe 40. Flow adjustment mass 41. Triangular weir 50. Sewage septic tank.

 ──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor Nobuyoshi Katagai 1250 Shimoedori, Shimodate-shi, Ibaraki Pref.Hitachi Kasei Kogyo Co., Ltd. (72) Inventor: Tsutomu Ishigaki, 1250 Shimoedori, Shimodate-shi, Ibaraki Pref.

Claims (2)

[Claims] 1. The tank is partitioned by a partition wall, and the first anaerobic filter tank, the second anaerobic filter tank, the aerobic filter tank, the treatment water tank, and the disinfecting tank are arranged in this order from the upstream side, In the sewage purification tank comprising a horizontal pipe for transferring circulating water and washing wastewater from the bottom of the aerobic filter tank or the bottom of the treated water tank to the first chamber of the anaerobic filter tank, and a transfer pipe connected to the horizontal pipe, A sewage treatment tank characterized by having a circulation inner pipe and a cleaning inner pipe connected to a blower inside a transfer pipe. 2. The sewage treatment tank according to claim 1, wherein an inner pipe serving as a circulation inner pipe and a washing inner pipe connected to the blower is provided inside the transfer pipe.