JP2839065B2 - Septic tank - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention provides an anaerobic filter tank, an aerobic filter tank, and a sedimentation tank from the upstream side so that water to be treated flows in this order by natural advection, and a disinfection tank is provided. A first air supply pipe for diffusing air to the filter bed tank, a second air supply pipe for returning water to be treated from the downstream side to the upstream side, and disinfecting tank for supplying the treated water from the settling tank to the disinfecting tank A third air supply pipe for an air lift pipe to be transferred to the air purifier is connected to a septic tank connected to a blower.

[0002]

2. Description of the Related Art Conventionally, in such a septic tank, the first, second, and third air supply pipes are specially connected to a blower so that air bubbles generated by air supply rise in water due to buoyancy. The water to be treated is returned or transported (hereinafter abbreviated as transport, etc.) using the water pumping effect (hereinafter referred to as the air lift effect) of the equipment, so that compared with the case of pumping the water, It has been considered to reduce the cost. In such a case, only continuous air supply to the third air supply pipe has been considered.

[0003]

The above-mentioned septic tank has the advantage that the water to be treated can be transferred without using a large-scale facility such as a water pump and the like, and the facility is low in cost and easy to maintain. On the other hand, the air supply amount generally supplied for aeration is 40 to 80 liters / minute,
While the amount of air supplied to the return pipe is 10 to 15 liters / minute, the amount of air supplied to the air lift pipe from the sedimentation tank to the disinfection tank is 10 liters / minute or less (specifically, 2 to 15 liters / minute). Liter / min), and when the small air supply is maintained in order to always maintain a constant flow rate, the sedimentation tank is changed according to the change in the flow rate of the raw water flowing into the purification tank. The transfer rate of the water to be transferred transferred from the tank to the disinfection tank changes greatly.

[0004] Therefore, when raw water suddenly flows in,
When the water level in the septic tank fluctuates, the transfer amount of the water to be treated transferred from the sedimentation tank to the disinfection tank increases, and there is a risk that the water to be treated that is not sufficiently treated is discharged. Further, when a large amount of water to be treated is transferred at a time, sludge floating in the sedimentation tank (hereinafter referred to as separated sludge) may be discharged together with the treated water.

Accordingly, an object of the present invention is to provide
An object of the present invention is to provide a septic tank at a low cost, in which the discharge flow rate of the treated water to the outside of the septic tank does not largely fluctuate and there is little possibility that the separated sludge is mixed with the treated water and discharged.

[0006]

To achieve the above object, the present invention is characterized by a first air supply pipe for diffusing air into an aerobic filter bed tank, and a treatment water flowing from a downstream side to an upstream side. And a third air supply pipe for an air lift pipe for transferring treated water from the sedimentation tank to the disinfection tank are connected to one blower, and the third air supply pipe is connected to the third blower from the blower. An air supply amount adjusting means for intermittently supplying air to the air supply pipe is provided, and the operation and effect thereof are as follows.

[0007]

In other words, since the first, second and third air supply pipes are connected to one blower, the air supply pipe is connected to a pump or the like to transfer the water to be treated. As it can reduce costs and supply air with a common blower,
A septic tank can be operated while efficiently supplying air, and a low-cost septic tank is provided as compared with a case where air supply pipes are separately provided for the first, second, and third air supply pipes. I can do it.

Further, since an air supply amount adjusting means for intermittently supplying air from the blower to the third air supply pipe is provided, the air supply to the third air supply pipe is intermittently performed. By increasing the amount of air supplied to the air lift pipe transferred from the sedimentation tank to the disinfection tank, the transfer rate of the water to be treated transferred from the sedimentation tank to the The amount can be set so as not to change, and by setting in this way, the average discharge flow rate of the treated water can be controlled in a totally stable state. Needless to say, if such control is performed, it is possible to set the air supply amount such that the separated sludge is not mixed into the treated water and released.

[0009]

As a result, the average discharge amount of the treated water can be controlled to a stable state in total, so that the biological treatment of the treated water in the septic tank can be sufficiently performed and the separated sludge is treated. Since the risk of being mixed into the water can be reduced, a high-performance septic tank capable of discharging raw water as highly purified treated water can be realized at low cost.

[0010]

Embodiments of the present invention will be described below with reference to the drawings. As shown in FIG. 1, from the upstream side, an anaerobic filter tank N comprising an anaerobic filter tank first chamber N1 and an anaerobic filter tank second chamber N2, an aerobic filter tank first chamber E1, and an aerobic filter bed. Tank second room E2
An aerobic filter tank E and a sedimentation tank P are provided so that water to be treated flows in this order by natural advection, and a disinfection tank Q is provided above the sedimentation tank P to constitute a purification tank.

The first anaerobic filter tank N1 and the second anaerobic filter tank N2 grow anaerobic microorganisms that anaerobically decompose organic substances in the water to be treated and filter them to fix their biofilms. Floors F1 and F2 are provided respectively. The first chamber E1 of the aerobic filter tank and the second chamber E2 of the aerobic filter tank are used to fix aerobic microorganisms that decompose the remaining organic matter in the water to be treated and perform a nitrification reaction of ammonia nitrogen. First and second contact materials C1 and C2 are separately provided, and a circulating flow of the water to be treated is generated in each chamber, and organic substances are removed from the aerobic microorganisms fixed on the first and second contact materials C1 and C2. Aeration tubes D1 and D2 are provided for bringing the treated water into good contact and supplying air for providing necessary oxygen to the aerobic microorganisms.

Further, in order to prevent clogging due to excessive adhesion of biofilms and the like to the contact materials C1 and C2, a backwash tube R1 for bubbling air to separate the excessively attached biofilms and the like as separation sludge. , R2 are provided below the contact members C1, C2, respectively. In addition, the first room E1 of the aerobic filter tank
An air lift pipe A1 for returning the water to be treated in the first chamber N1 to the anaerobic filter tank is provided in the first chamber E1 of the aerobic filter tank and the water to be treated in the second chamber E2 of the aerobic filter tank. The anaerobic filter tank 1st room N1
The air lift pipe A2 returned to the aerobic filter bed tank E2
In the upper part of the septic tank, return pipes A are formed by connecting to horizontal pipes A3 provided from the anaerobic filter tank to the aerobic filter tank, respectively.

Next, the sedimentation tank P and the disinfection tank Q will be described.
To remove sediment sludge that has been transferred. Between the sedimentation tank P and the disinfection tank Q, U
A letter-shaped air lift pipe U is provided, and the water to be treated can be transferred from the sedimentation tank P to the disinfection tank Q through the air lift pipe U.

Since the air lift pipe U has a U-shape, only the liquid to be treated in the upper part of the sedimentation tank P having a small amount of suspended sludge can be moved to the disinfection tank Q. When the amount of water to be treated in the septic tank decreases, the transfer of the water to be treated is stopped, and the amount of water to be treated in the septic tank can be maintained at a certain level.

The air diffusers D1, D2 are connected to a blower B via a first air supply pipe 1, and the air lift pipes A1, A2 are connected to the blower B via a second air supply pipe 2.
The air lift pipe U is connected to the blower B via a third air supply pipe 3, and the backwash pipes R1 and R2 are connected to the blower via a fourth air supply pipe 4. B, and each of them functions by supplying air from one blower B.

An air supply adjusting means M is further provided between the third air supply pipe 3 and the blower B to intermittently transfer the water to be treated from the sedimentation tank P to the disinfection tank Q. The flow rate of the treated water discharged from the septic tank can be adjusted to a predetermined amount, and an air flow opening / closing mechanism V is further provided between the fourth air supply pipe 4 and the blower B. Yes, the contact material can be backwashed periodically (about 15 minutes once a day).

In this purification tank 1, the water to be treated moves between each tank and N1, N2, E1, and E2, except for the settling tank P and the disinfection tank Q, by a natural advection method. Then, by the supply of air to the air lift pipes A1 and A2, the return pipe A is operated to return the water to be treated, and intermittently to the air lift pipe U between the sedimentation tank P and the disinfection tank Q. By the appropriate air supply, the water to be treated is constantly transferred over a long period of time.

That is, the water to be treated in the second chamber E2 of the aerobic filter tank is returned to the first chamber N1 of the anaerobic filter tank by the air lift pipe A1. At this time, the water to be treated includes the separated sludge separated from the contact material C2 disposed in the second chamber E2 of the aerobic filter bed, and the nitrification liquid that has been completely decomposed with ammonia. As a result, the nitrification liquid is satisfactorily denitrified in the first chamber of the anaerobic filter tank and the second chamber of the anaerobic filter tank, and the water to be treated is purified. Further, here, the water to be treated moves between the tanks N1, N2, E1, and E2 as described above. As a result, decomposition treatment is performed in the first and second chambers N1 and N2 of the anaerobic filter tank.
The denitrification process proceeds. That is, with the circulation of the water to be treated in the septic tank 1, the movement and supply of the separated sludge occur, and the nitrifying liquid in the aerobic filter tanks E1 and E2 also converts the anaerobic filter tank N1 suitable for the denitrification treatment. , N2 to accelerate the processing. Therefore, since the separated sludge can be returned, the treatment in the septic tank 1 can be sufficiently advanced, and the concentration of the separated sludge in the second chamber E2 of the aerobic filter tank can be suppressed to a low level.

Further, the water to be treated is aerobic filter bed tank second chamber E2.
From the lower part to the settling tank P, and to the disinfection tank Q by the air lift pipe U. At this time, the amount of water transferred by the air lift is set to, for example, about 4 liters / minute in a septic tank for human waste treatment with about 5 to 10 target personnel, and if an intermittent operation of alternately operating and stopping is performed, the separated sludge is discharged to the outside of the septic tank. In addition to preventing outflow, the discharge rate of treated water was set to a predetermined amount due to fluctuations in the inflow of raw water, and fluctuations could be suppressed over the long term. Therefore, the nitrification and denitrification effects are sufficiently exhibited in the septic tank.

Each of the tanks is formed such that the water to be treated introduced into the disinfecting tank Q is disinfected by contact with a solid disinfectant and then discharged from the discharge port Z to the outside as treated water.

Accordingly, the raw water entering from the inlet I is discharged after the above-mentioned treatment, so that it can be discharged as highly purified treated water.

[Brief description of the drawings]

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

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 1st air supply pipe 2 2nd air supply pipe 3 3rd air supply pipe B Blower E Aerobic filter bed tank M Air supply control means N Anaerobic filter bed tank P Precipitation tank Q Disinfection tank

──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kazuyuki Honda 1 at 2, Takamatsu, Kosai-cho, Koga-gun, Koka-gun, Shiga Prefecture Inside the Kubota Shiga Plant (72) Katsumi Hamada 2, Takamatsu, Kosai-cho, Koga-gun, Shiga 1 Kubota Corporation Shiga Factory (56) References JP-A-5-4030 (JP, A) JP-A-4-200792 (JP, A) JP-A-5-5081 (JP, A) JP-A-5 −138184 (JP, A) (58) Fields investigated (Int. Cl. ⁶ , DB name) C02F 3/00

Claims (1)

(57) [Claims] An anaerobic filter tank (N), an aerobic filter tank (E), and a sedimentation tank (P) are provided from the upstream side so that water to be treated flows in this order by natural advection, and a disinfection tank (Q) is provided. ), And a first air supply pipe (1) for diffusing air into the aerobic filter bed tank (E) and a second air supply pipe (for returning water to be treated from the downstream side to the upstream side). 2) and a third air supply pipe (3) for an air lift pipe for transferring the water to be treated from the sedimentation tank to the disinfection tank, and each of the air supply pipes (1),
(2) and (3) are septic tanks connected to the blower (B), and the first, second and third air supply pipes (1), (2) and (3) are connected to one blower ( B) and a purification tank provided with an air supply amount adjusting means (M) for intermittently supplying air from the blower (B) to the third air supply pipe (3).