JP2587460Y2 - Septic tank - Google Patents

Description

[Detailed description of the invention]

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a purification tank in which a plurality of processing tanks are provided in series in a flow direction.

[0002]

2. Description of the Related Art Conventionally, in this type of purification tank, a weir for overflowing the water to be treated is provided in the adjacent treatment tank for sending the water to be treated from an upstream treatment tank to a downstream treatment tank. In this case, a natural advection was used.

[0003]

However, in such a purification tank, if the flow rate of the treated water flowing into the upstream treatment tank increases, the water level rises, and if the water level rises, the overflow amount also increases. Therefore, for example, when treated water having a treatment capacity or more flows in at the time of peak inflow, the treated water is advected without being sufficiently treated, and there is a possibility that suspended solids and BOD in the wastewater finally discharged exceed regulatory values. there were. Therefore, the purpose of the present invention is to send the water to be treated to the downstream treatment tank at a substantially constant average flow rate even if there is some fluctuation in the flow rate of the water to be treated to the treatment tank on the upstream side. Another object of the present invention is to provide a septic tank capable of performing a biological treatment.

[0004]

In order to achieve the object, a characteristic structure of a septic tank according to the present invention includes a plurality of treatment tanks.
(T1, T2) is a septic tank provided in series in the flow path direction.
And the processing tank on the upstream side of the adjacent processing tank (T2)
When an air lift pump device (J) is installed in (T1)
In both cases, the air lift pump device (J)
Opened upwards and pumped water to be treated
Connectable to the discharge path (H) for discharging to the processing tank (T2)
And the other end is opened in the processing tank (T1) on the upstream side.
A U-shaped pipe is provided at the bottom of the discharge channel.
Water to be treated by the air lift pump device (J)
An outlet (1c) for discharging downstream is provided, and
Insert the air supply pipe for air lift (2) into the end side,
The opening is vertically movable independently of the U-shaped tube.
And an air supply unit (K) is provided.
Level detecting means (L) for detecting the level of the processing tank (T1)
And based on the detection result of the liquid level detection means (L),
The air supply unit (K) follows up and down the liquid level,
By moving up and down with respect to the outlet (1c),
Fluctuation of transfer flow rate to ratio of vertical fluctuation of liquid level
In that interlocking means for reducing
You.

[0005]

If the air lift pump device is provided and a discharge path for discharging the water to be treated pumped to the downstream processing tank is provided, the air lift pump device can be used instead of the conventional natural advection. Since only the pumped water to be treated can be discharged from the discharge path to the treatment tank on the downstream side, the transfer flow rate can be easily adjusted. An air supply unit for the air lift pump device is provided so as to be vertically movable, and a liquid level detecting means for detecting a liquid level of the upstream processing tank is provided. The liquid level is detected based on a detection result of the liquid level detecting means. Since the interlocking means for interlocking the air supply unit up and down by following up and down is provided, the depth of the air supply unit from the liquid surface is kept constant even if the liquid surface fluctuates up and down. Can be.

[0006]

[Effect of the Invention] Since the transfer of the processing liquid from the upstream processing tank to the downstream processing tank is performed by an air lift pump device, the liquid processing liquid has a simpler structure than the conventional natural advection due to overflow, but has a simple structure. Fluctuations in the transfer flow rate due to the vertical movement of the surface can be reduced. It is also conceivable that the processing liquid is transferred by a metering pump equipped with an electric motor.In this case, however, troubles such as clogging are likely to occur unless the processing liquid is clear. Since there are no moving parts and no troubles caused by overload or idling, maintenance is easy. Also, since the depth of the air supply unit from the liquid level can be kept constant even if the liquid level fluctuates up and down, for example, when the liquid level rises, the air supply unit The fluctuation of the transfer flow rate due to the rise and fall of the liquid level can be further reduced as compared with the case of a normal fixed air lift in which the depth of the liquid increases. More specifically, according to the conventional air lift pump device, when the liquid level rises, the lift is raised by an amount corresponding to the fluctuation of the liquid level, that is, by an amount corresponding to a decrease in the distance from the liquid level to the outlet. Not only that, the amount of air to be treated is increased by the synergistic effect that the air supply length is increased by the amount of the air lift length below the liquid level and the effect of raising the lifting bottom is exhibited. , But on the other hand,
According to the configuration of the present invention, it is only necessary to increase the transfer amount corresponding to the lifting of the bottom by the amount by which the distance from the liquid surface to the drop is reduced, for example, when a large amount of water to be treated flows into the upstream side However, simply transferring the water to be treated at a constant flow rate may cause the water to remain in the upstream tank for a long period of time, whereas the water to be treated from the upstream to the downstream may be While securing the water transfer amount, compared to the conventional configuration,
The transfer rate of the water to be treated has become less variable and can be kept more constant. The upper end for pumping the processing liquid
Since the surface is fixed, it is positioned relative to the discharge section.
Position is fixed, without requiring a particularly large space,
An air lift pump device can be provided. Further
Only the air supply pipe moves up and down.
-Is the entire lift pump device moving up and down?
The upper and lower air supply units to detect the liquid level by the liquid level detection means.
For example, you can follow the movement with a small force.
In example, the corner with a simple configuration of only providing a float, ya
The entire air lift pump device in a small space.
Can be achieved. Note that the vertical movement of the air supply
Connection with a blower that supplies air
It is possible to adopt a simple one that simply connects a sex hose. Therefore, the variation in the load of the biological treatment can be reduced, and the variation in the air pressure for the air lift pump is reduced only by the fact that the depth of the air supply unit from the liquid surface is constant. Even if the air for the air lift pump is supplied from the same air supply source as the air for air diffusion in the contact aeration tank, the air pressure for air diffusion can be kept substantially constant. For this reason, it is easy to keep the circulating flow and the dissolved oxygen amount in the tank constant. In other words, with the above-described configuration, while the maintenance and management is easy, even if there is some fluctuation in the flow rate of the water to be treated to the treatment tank on the upstream side, To the processing tank,
Septic tanks that can perform stable biological treatment are extremely
With a simple configuration, and too much space in the septic tank
Could be provided without having to do so. Moreover, with respect to the upstream water level fluctuation, the effect of the upstream water level fluctuation was able to be eliminated at an early stage, leaving the change in the amount of transferred water to some extent, and the effect of the downstream water level fluctuation was also suppressed. is there.

[0007]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG.
Anaerobic filter bed tank first chamber N1, anaerobic filter bed tank second chamber N2, contact aeration tank first chamber E1, contact aeration tank second chamber E2, settling tank P, disinfection tank S, and treatment tanks are provided. Is configured.
The first and second chambers anaerobic filter tanks N1 and N2 are provided with filter beds F1 and F2 for growing anaerobic microorganisms that anaerobically decompose organic substances in the water to be treated and fixing the biofilm. ,
In this case, we do not do anything. The first and second chambers E1 and E2 of the contact aeration tank are provided with contact materials C1 and C for growing and fixing aerobic microorganisms that oxidatively decompose organic substances and the like in the water to be treated.
2 is provided, a circulating flow of the water to be treated is generated in the tank, and the water to be treated containing the organic matter is brought into good contact with the aerobic microorganisms grown and fixed on the contact materials C1 and C2. Air diffusion tubes D1 and D2 for supplying aeration air for supplying oxygen to the air are provided. Contact aeration tank second
The water to be treated in the chamber E2 is transferred from the bottom to the sedimentation tank P, and the supernatant of the sedimentation tank P is discharged from the discharge pipe 11 through the disinfection tank S. With the flow rate of the water to be treated flowing from the inflow pipe 10, the water to be treated from the first anaerobic filter tank N1 rises from the bottom of the filter bed F1 and rises from the bottom of the anaerobic filter tank second.
The anaerobic filter tank first chamber N1 and the anaerobic filter tank second overflow so as to overflow to the chamber N2 side and naturally flow to the bottom of the filter bed F2.
A pair of advection tubes L1 and L2 are provided symmetrically with respect to the center line in the flow direction of the septic tank in the partition wall 5 between the chamber N2. The bulkhead 13 between the anaerobic filter tank second chamber N2 and the contact aeration tank first chamber E1 is provided with an overflow portion V3 by natural advection at one place in the upper center. As shown in the plan view and the side sectional view of the main part in FIGS. 2 and 3, the upstream and downstream processing tanks
The first room (E1) and the second room (E2)
When used, the partition 14 between the contact aeration tank first chamber E1 (T1) and the contact aeration tank second chamber E2 (T2) is not provided with an overflow section due to natural advection. An air lift pump device J is provided in the tank first chamber E1 (T1) , and a lid also serves as a constant head storage tank for temporarily storing the water to be treated pumped up by the air lift pump device J and as an air vent. A box-shaped constant head box 1 having no contact is provided with a double contact aeration tank first chamber and a second chamber E1.
(T1), provided at a position higher than the liquid level of E2 (T2) ,
The fixed head box 1 has a downstream overflow portion 1a having a V notch formed in the middle partition 1d and a dropout 1
c and the treated water is contacted via the second chamber E2 (T
A discharge path H for discharging is provided in 2) . The air lift pump device J has a hollow pipe formed in a J-shape, and the upper end of an air lift air supply pipe 2 formed with an opening serving as an air supply portion K to the air lift pump device J at the lower end. The air supply pipe 3 is connected to the air supply pipe 3 via a flexible hose 4, and the air lift air supply pipe 2 is vertically movably inserted from the upper part of the air lift pump device J, and the contact aeration tank first chamber E 1 (T 1 A) a float L serving as a liquid level detecting means for detecting the liquid level, and the float L being rigidly connected to the air supply pipe 2; Interlocking means for interlocking K up and down is configured. In the constant head box 1, an overflow portion 1b formed by horizontally cutting an upper portion of a side wall 1e on the side of the first chamber E1 (T1) of the contact aeration tank is slightly higher than the overflow portion 1a to the downstream side. Even if the flow rate of the water to be treated pumped by the air lift pump device J becomes too large, the flow rate to the downstream side can be maintained substantially constant by overflowing from the overflow section 1b, A gutter-shaped return path B for returning the water to be treated that has overflowed from the overflow section 1b to the first anaerobic filter bed tank N1 is provided. In addition, even if the posture of the septic tank is slightly deviated during installation, for example, the return path B
The upper part of the air lift pump device J is made of a flexible pipe so that the inclination of the air lift pump device J can be easily and appropriately corrected. or,
For example, even if the inflow of the water to be treated into the septic tank stops for a relatively long time, even if the contact aeration tank first chamber E1 (T
The suction port J1 of the air lift pump device J is provided at the height of the control lower limit of the liquid level so that the liquid level in 1) does not drop too much. With the above configuration, for example, even if there is some variation in the amount of inflow of the water to be treated into the septic tank, or even if the pumping amount of the air lift pump device J is set slightly larger, the average flow rate is substantially constant. Thus, the water to be treated can be sent to the treatment tank on the downstream side, so that it is possible to provide a purification tank capable of performing stable biological treatment while being easy to maintain. The air lift pump device may be installed in the anaerobic filter bed tank second chamber N2 or the like.

[Another embodiment] Instead of the float L, for example, a liquid level detecting means L using a pressure sensor is used, and based on the detection result, the air supply unit K follows the liquid level up and down. Another configuration may be adopted, such as providing a device that drives mechanically up and down.

In the claims of the utility model registration, reference numerals are written for convenience of comparison with the drawings, but the present invention is not limited to the configuration of the attached drawings by the entry.

[Brief description of the drawings]

FIG. 1 is a side sectional view showing an entire septic tank according to an embodiment of the present invention.

FIG. 2 is a plan view of a main part of the embodiment.

FIG. 3 is a side sectional view of a main part of the embodiment.

[Description of Signs ] T1 Upstream processing tank T2 Downstream processing tank J Air lift pump device L Liquid level detecting means K Air supply unit

──────────────────────────────────────────────────続 き Continuing on the front page (72) Inventor: Dai Harada 2 at Takamatsu, Kosai-cho, Koga-gun, Shiga Prefecture Inside the Kubota Shiga Plant (72) Inventor: Kazuyuki Honda 2nd Takamatsu, Kosai-cho, Koga-gun, Shiga 1 Kubota Corporation Shiga Plant (56) References JP-A-2-108900 (JP, A) JP-A-54-26509 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) ) C02F 3/00 F04F 1/18

Claims (1)

(57) [Scope of request for utility model registration] 1. A purifying tank comprising a plurality of processing tanks (T1, T2) provided in series in a flow direction, wherein the adjacent processing tanks are provided.
An air lift pump device (J) is provided in the treatment tank (T1) on the upstream side of (T2) , and the air lift pump device (J) is opened at one end side and the water to be treated is pumped up. Is formed so as to be freely connectable to a discharge path (H) for discharging the processing tank (T2) on the downstream side, and the other end is upward.
Rutotomoni provided <br/> flow side the processing bath (T1) U-shaped tube which had been opened in the said downstream side of the discharge path Earifu
To discharge the water to be treated by the pump unit (J) to the downstream side
A port (1c) is provided, and an air supply pipe (2) for air lift is inserted into the one end , and the opening is formed so as to be vertically movable independently of the U-shaped pipe. (K), a liquid level detecting means (L) for detecting the liquid level of the upstream processing tank (T1) , and the liquid level detecting means (L) based on the detection result of the liquid level detecting means (L). The air supply unit (K) is moved up and down on the surface, and the air outlet (1c)
A purification tank provided with interlocking means for moving up and down with respect to the flow rate of the liquid flow in the upstream processing tank so as to reduce the fluctuation of the transfer flow rate with respect to the ratio of the vertical fluctuation amount of the liquid level in the upstream processing tank.