JP3288560B2 - Membrane separation tank and 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 septic tank provided with a membrane separation tank in which a membrane separation device for filtering water to be treated is installed.

[0002]

2. Description of the Related Art Conventionally, a septic tank of this type has been generally buried and used in the ground. Therefore, a membrane separation tank and a membrane separation device used in the septic tank are arranged in the ground.
Was.

[0003]

The above-mentioned conventional membrane separation tank is to be buried in the ground, and is required to be inserted into and removed from an entrance when performing maintenance of a membrane separation apparatus provided in the membrane separation tank. However, there is a problem that a large amount of labor is required. This is because at the time of maintenance of the membrane separation device, the water to be treated should be withdrawn from the membrane separation tank, the water level should be lowered to at least the upper end of the membrane separation device, and then the membrane separation device should be taken out of the membrane separation tank. This is because it takes time to extract the water to be treated, and the membrane separation device must be drawn out over a long distance. Further, in order to bury the membrane separation tank, a pit having a depth equivalent to the height of the membrane separation tank must be provided, and providing a deep pit requires a great deal of labor and labor. It was difficult to secure a sufficient depth for storing the water to be treated. In general, aerobic water treatment is often performed in a membrane separation tank, and often involves oxygen supply.However, as described above, in a situation where the depth of the water to be treated in the membrane separation tank cannot be sufficiently secured. The oxygen supply to the membrane separation tank will be performed at a shallow position, and the water pressure applied to the bubbles,
There is a situation in which the gas-liquid contact time is reduced and the oxygen dissolving efficiency is hardly sufficient, and the aerobic treatment of the water to be treated may be insufficient. Further, when the cleaning effect of the membrane separation device is expected by the bubbles, furthermore, since the rising speed of the bubbles must be small, the bubbles come into contact with the membrane surface of the membrane separation device. There is an inconvenience that the power to remove the dirt is weak, and the dirt of the membrane separation device is easily accumulated.

SUMMARY OF THE INVENTION Accordingly, an object of the present invention is to provide a septic tank having a structure capable of improving water treatment performance and being easy to maintain in view of the above-mentioned drawbacks.

[0005]

In order to achieve this object, the membrane separation tank according to the present invention is characterized by providing a first septic tank for anaerobically treating the water to be treated, The septic tank is buried underground,
Membrane filtration of water to be treated that is larger than the height of the first tank
Semi-submerged membrane separation tank with separation device installed in membrane separation vessel
The water to be treated from the septic tank first tank is configured to be able to be advected to the membrane separation tank, and the entrance and exit of the membrane separation device are
Installed above the ground surface of the membrane separation vessel to contain the water to be treated
The depth is formed to be greater than the depth of the membrane separation vessel buried underground.
Lies in are, the effects thereof are as follows.

[Effects] That is, the upper end of the membrane separation device is disposed above the ground surface, and the upper end of the membrane separation device is positioned above the ground surface.
More By providing the outlet of the water to be treated down, before taking out the membrane separation device from the membrane separation container to the membrane separation tank outside, for discharging the treated water from the membrane separation tank, it takes a power Since the water to be treated can be advected and discharged without any need, the labor for extracting the water to be treated during maintenance has been greatly reduced.

[0007] In the above configuration, the septic tank is used.
Since the water depth of the membrane separation tank in can be made deeper than the first tank of the septic tank , even in the case of performing aerobic treatment in the membrane separation tank and performing aerobic treatment of the water to be treated, the treatment efficiency is set high.
I'm sorry. Further, the cleaning efficiency of the diffuser according to the filtration membrane apparatus can be maintained even higher Runode, it is convenient to dirt prevent water improvement, filtration membrane device of the water to be treated.

Further, the doorway, if than the ground surface is provided on the upper and side includes: the membrane separation device to retrieve the membrane separator from the entrance after the withdrawal of the treated water, it is Ru can keep in close proximity of the positions of the doorway. In such a case , the membrane separation device can be easily configured to be taken out with little labor. In some cases, it is possible to perform maintenance from outside through the entrance. Therefore, maintenance is easier
A simple configuration can be provided.

If the membrane separation device is connected to the side wall, it is advantageous when maintenance is performed from the entrance. Also, with the above-described configuration, the water level of the membrane separation tank is often higher than the water level of the destination of the water to be treated . Therefore, if the transport path of the filtered water filtered by the membrane separation device is directly connected to the advection destination, the water level of the membrane separation tank may drop abnormally and become lower than the upper end of the membrane separation tank. On the other hand , if the transfer path is provided with an atmosphere opening section that opens to the atmosphere above the upper end of the membrane separation device, the filtration operation of the water to be treated is interrupted, or the Exposure and drying, and the inconvenience of fixing and clogging with dirt can be prevented.

[0010] A first septic tank for anaerobically treating the water to be treated is provided, and the first tank is buried underground , and the membrane separation tank is provided. if the by advection freely configured on the membrane separation tank, Kiyoshi
The entire gasification tank was installed in a pit excavated at the same depth
Even if, the septic tank first tank unnecessary for aerobic treatment, is relatively shallow water to be treated accommodated depth, and smaller ones of underground conditions, Ru can the membrane separation tank sufficiently deeper .
Therefore, it is possible to provide an easy-to-maintain configuration while maintaining the compactness of the septic tank as a whole, while maintaining the advantages of increasing the water treatment performance of the membrane separation tank.
Things were done.

[0011]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A septic tank using a membrane separation tank according to the present invention will be shown, and embodiments of the present invention will be described with reference to the drawings.

The purifying tank shown in FIG. 1 has a flow controlling tank N and a denitrifying tank E1 from the upstream side, and a first purifying tank X and a denitrifying tank E1.
It is composed of a membrane separation tank E2 and a discharge tank T, and the water to be treated is supplied to the flow control tank N, the denitrification tank E1, and the membrane separation tank E.
2. It can be transported in the order of the discharge tank T.

The flow control tank N is provided with a first tank X for the purification tank.
The raw water treated water flowing into the septic tank from the inlet I provided on one side of the wastewater is treated by the anaerobic bacteria growing therein while sedimenting and removing impurities in the treated water. A filter bed F for preliminarily filtering solid components in the water to be treated and transferring the filtered supernatant to the denitrification tank E1 is placed in a water treatment chamber for temporarily storing the water to be treated while performing anaerobic treatment. The interior is configured. The advection section A0 for advancing the supernatant is provided with a backflow prevention plate F1 for preventing the backflow of the activated sludge or the like in the denitrification tank, so that the water to be treated is smoothly transferred and the water treatment is performed. Can be efficiently performed.

In the denitrification tank E1, a second pump P2 is provided in a water treatment chamber adjacent to the flow rate adjusting tank N, and a transfer pipe A2 is provided in the second pump P2 to separate the water to be treated by the membrane separation. It is configured to transfer to the tank E2. Further, a stirring pump P3 for stirring and circulating the water to be treated in the tank is provided therein,
The treatment water in the tank is mixed, and the treatment water having a high BOD load and the nitrification treatment water are mixed to perform advanced denitrification treatment.

The above-mentioned first septic tank X is buried underground,
Used for maintenance from the manhole H.

The membrane separation tank E2 is provided in the first tank X
And a separate passage for receiving the water to be treated flowing from the transfer pipe A2 in the membrane separation vessel M, and the membrane that excessively flows in from the denitrification tank E1. A return path A3 for returning the treated water to the denitrification tank E1 is provided. Further, the membrane separation vessel M is provided with a membrane separation device M0 in which a number of flat filtration membrane plates are arranged in parallel in an upright state, and the membrane separation device M0 includes a filtration membrane plate. Providing a filtration membrane plate holding frame for holding a number of aligned, providing a leg supporting the filtration membrane plate holding frame at the bottom, supplying air bubbles to the filtration membrane plate between the legs,
A diffuser D for supplying oxygen to the water to be treated while preventing a sludge or the like from adhering excessively to the membrane surface and forming a circulating flow in the membrane separation tank E2 is provided therein. . In addition, a water intake pipe M1 is connected to each filtration membrane plate of the membrane separation device M0, and a water collection pipe M2 that joins filtered water from the water intake pipe M1 and guides the filtered water out of the membrane separation tank E1 is connected. And below the water surface of the membrane separation tank E2, and
From above the upper end of the membrane separation device M0, a transport path for transporting the film to the outside of the membrane separation tank E2 is formed.
3 is provided to prevent the water level of the membrane separation tank E2 from abnormally lowering to below the upper end of the membrane separation device M0, and to prevent the transport of the water to be treated from being interrupted on the way. The transport path is connected to the discharge tank T. Further, an inlet / outlet M4 from which the membrane separation device can be taken out is provided in a side wall portion of the membrane separation tank E2, and a treated water discharge portion M5 is provided near a lower end portion of the inlet / outlet M4. , The level of the water to be treated contained in the
It is configured to be lowered to the lower part.

The above-mentioned membrane separation vessel M is semi-buried underground (in a state where the lower part of the entrance M4 is buried), and the water to be treated is discharged from the treated water discharge section M5.
After exposing the upper part of the membrane separation unit M0 to the water surface, the entrance M4 is opened to take out the membrane separation device M0, and it is arranged so that maintenance such as replacement or cleaning can be easily performed (FIG. 2).
reference).

The discharge tank T includes a disinfection tank Q1 and a storage tank Q.
2, and the transport path extends to the disinfection tank Q1. The treated water flowing into the disinfecting tank Q1 is configured to contact the disinfectant and then flow into the storage tank Q2. In the storage tank Q2, a discharge pump P4 having a U-shaped pipe U is installed, and the storage tank Q2 is disposed above a steady water level.
The water to be treated stored in 1 is pumped up and discharged from the discharge port Z to the outside of the tank.

[Alternative Embodiment] Although the membrane separation vessel M has a structure in which the entrance and exit M4 are provided on the side wall of the ground portion, the membrane separation vessel M can also be used as the manhole H. It is to be noted that the provision on the side wall has an advantage that the maintenance is easy because the entrance M4 can be at a low position. Septic tank first tank X
And the discharge tank T may be integrally formed.

In the claims, reference numerals are provided for convenience of comparison with the drawings, but the present invention is not limited to the configuration shown in the accompanying drawings.

[Brief description of the drawings]

FIG. 1 is a vertical side view of a septic tank.

FIG. 2 is a diagram showing a state of the membrane separation device during maintenance.

[Explanation of symbols]

 M Membrane separation vessel M0 Membrane separation device M4 Doorway E2 Membrane separation tank M2 Transport path M3 Open to atmosphere X Septic tank first 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-2-237692 (JP, A) JP-A-5-168864 (JP, A) JP-A-4-7023 (JP, A) JP-A-6 -91288 (JP, A) (58) Fields investigated (Int. Cl. ⁷ , DB name) C02F 3/00, 1/44

Claims (1)

(57) [Claims] 1. A septic tank (X) for anaerobic biological treatment of water to be treated is provided. The first tank (X) is buried underground, and the water to be treated is subjected to membrane filtration. Apparatus (M0) with membrane separation volume
The membrane separation tank installed in the vessel (M) is semi-buried in the ground, and the water to be treated from the first septic tank (X) is configured to be able to freely flow into the membrane separation tank, and the membrane separation device (M0) ) To the membrane (M4)
It is disposed above the ground surface of the container (M), and the depth of the water to be treated is stored in the membrane separation container (M).
A septic tank that is much larger than that .