JP2000271582A - Septic tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To connect each diffusion pipe to a diffusion pipe header by making the length of branch pipes which are formed in the diffusion pipe header and connect each diffusion pipe is made different from that of adjacent ones in a septic tank in which the diffusion pipes branched from the diffusion pipe header are introduced into a treatment tank. SOLUTION: This septic tank has, for example, an aeration tank which is a treatment tank, and an immersion type membrane separator having a filter membrane for membrane separation and diffusion pipes 2 for ejecting air from a blower through a diffusion pipe header 1 are installed in the aeration tank. Branch pipes 4 connecting each diffusion pipe 2 is formed integrally in the diffusion pipe header 1, and the length of each branch pipe 4 is made different from that of adjacent ones. An union screw 18 is fitted to each branch pipe 4, an union flange 19 is fitted to each diffusion pipe 2, an union nut 6 fitted on the union flange 19 side is rotated to be screw-connected, and each diffusion pipe 2 is connected with each branch pipe 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a septic tank in which a plurality of diffuser tubes are branched from a diffuser header and introduced into a treatment tank. More specifically, a plurality of diffuser tubes are easily connected to the diffuser header. It is related to the technology to be attempted.

[0002]

2. Description of the Related Art Conventionally, in a septic tank in which a plurality of diffuser tubes 2 are branched from a diffuser tube header 1 and introduced into a treatment tank 3, as shown in FIG. The tubes 4a are projected to an equal length.

[0003]

However, if the lengths of the many branch pipes 4a are equal, the adjacent diffuser pipes 2 connected to the branch pipes 4a hinder the connection workability. was there.

An object of the present invention is to solve such a problem, and an object of the present invention is to provide a septic tank in which a plurality of air diffusers can be easily connected to an air diffuser header.

[0005]

According to a first aspect of the present invention, there is provided a septic tank in which a plurality of diffuser tubes 2 are branched from an diffuser tube header 1 and introduced into a processing tank 3, and are formed in the diffuser tube header 1. The length of the plurality of branch pipes 4 connecting the diffuser pipes 2 is different from that of the adjacent branch pipes. According to such a configuration, the air diffuser 2 adjacent to the branch pipe 4 does not become an obstacle, and the workability of the connection of the branch pipe 4 can be improved.

In the second aspect, the branch pipe 4 and the diffusing pipe 2
Is characterized by being connected by a union joint 5. According to such a configuration, the connection can be performed without rotating the air diffuser 2 by rotating the union nut 6 in spite of the screw connection, and the workability can be further improved.

[0007]

Embodiments of the present invention will be described below with reference to the drawings. 1 is a partial schematic perspective view, FIG. 2 is an overall schematic longitudinal sectional view, and FIG. 3 is an overall schematic transverse sectional view.

The purification tank A includes, for example, an aeration tank 7 as the processing tank 3, and a primary processing tank 8 and a secondary processing tank 9 are arranged as a preceding stage of the aeration tank 7.
After the domestic wastewater from the kitchen or the like is put into the primary treatment tank 8 and transferred to the secondary treatment tank 9 to separate the solid content, the wastewater as the water to be treated is removed by the transfer pump 10 into the aeration tank 7.
Transferred to.

In the aeration tank 7, a submerged membrane separation device 12 having a plurality of filtration membranes 11 for membrane separation, and a large number of air blowers that blow air from the blower 13 through the diffuser header 1. A diffuser tube 2 is provided to perform activated sludge treatment by microorganisms for biological decomposition and intermittent aeration treatment for nitrogen removal. That is, air is blown in from a blower 13 for aerobic treatment with activated sludge, and is blown out from the air diffuser 2 to perform aeration treatment. Further, in this aeration step, nitrification, which is one step for finally removing nitrogen from wastewater as nitrogen gas, is performed. Next, the blowing of air from the air diffuser 2 is stopped, and a non-aerated state is established. Denitrification is performed as a non-aerated step. That is, the nitrogen removal is repeated as one cycle of the aeration step (nitrification) and the non-aeration step (denitrification). In this way, in the activated sludge aeration tank 7 that performs intermittent aeration, decomposition of organic matter in wastewater and nitrogen removal are performed.

The time of one cycle consisting of the aeration step and the non-aeration step can be, for example, about 1 to 2 hours, and each step can be about 15 to 75 minutes. .

Similarly, without limitation, the concentration of activated sludge may be, for example, about 2,000 to 20,000 (mg / mg).
L).

Regarding the introduction of sludge into the aeration tank 7, the design minimum water level (LWL: Low Water Lin) of the aeration tank 7 is measured by, for example, a water level sensor (not shown).
e), the transfer pump 10 is operated and the sewage is aerated to a design maximum water level of the aeration tank 7 (HWL: High Water).
r Line). The timing of such charging can be considered, for example, so as to be performed in the latter half of the aeration step in which the water level of the aeration tank 7 drops, or together with the start of the aeration step after the end thereof.

A filtrate pipe 14 is connected to the immersion type membrane separation device 12 of the aeration tank 7, and the treated water that has passed through the filtration membrane 11 of the immersion type membrane separation device 12 is suctioned by a suction pump 15.
6 and discharged through a discharge port 17.

A large number of branch pipes 4 for connecting the diffuser pipes 2 are formed integrally with the diffuser pipe header 1 connected to the blower 13 by piping. The lengths of the plurality of branch pipes 4 are different from those of adjacent pipes. Thus, the adjacent air diffuser 2 connected to the branch pipe 4 does not become an obstacle,
The connection of the branch pipe 4 is easily performed to enhance the workability.

In this case, as shown in FIG. 5, a union screw 18 is connected to the branch pipe 4, a union flange 19 is connected to the diffuser pipe 2, and the union nut 6 rotatably provided on the union flange 19 side. Is turned and screw-connected to the union screw 18 to connect the diffuser tube 2 to the branch tube 4. As described above, by using the union joint 5 composed of the union screw 18, the union flange 19 and the union nut 6, the connection can be performed without rotating the air diffuser 2, and the workability can be further improved. .

As shown in FIG. 4A, the immersion type membrane separation device 12 has left and right side plates 20 which are recessed inward and project outward.
20 is connected by a connecting strip 21 bent outward to form an outer case 22, in which a plurality of filtration membranes 11 are juxtaposed and an air diffuser 2 is provided. In this case, a bent connecting rod 21a may be used in place of the connecting strip 21 as shown in FIG.
As shown in FIG. 7, a connecting plate 21b having a window hole may be used in place of the connecting band plate 21.

As shown in FIG. 6, the design of the air diffuser header 1 can be changed in various ways, for example, by increasing the length toward the center.

[0018]

According to the first aspect of the present invention, there is provided a septic tank in which a plurality of diffuser tubes are branched from a diffuser tube header and introduced into a treatment tank, wherein a plurality of diffuser tubes formed in the diffuser header and connecting the diffuser tubes are provided. Since the lengths of the branch pipes are different from those of the adjacent pipes, there is an advantage that the adjacent diffuser pipes connected to the branch pipes do not become an obstacle, and the workability of connecting the branch pipes can be improved.

In the second aspect, the branch pipe and the air diffuser are connected by a union joint. Therefore, in addition to the effect of the first aspect, the air diffuser is rotated by rotating the union nut while being screw-connected. There is an advantage that the connection can be made without rotating the, and the workability can be further improved.

[Brief description of the drawings]

FIG. 1 is a partial schematic perspective view showing an embodiment of a septic tank according to the present invention.

FIG. 2 is an overall schematic vertical sectional view of the same.

FIG. 3 is an overall schematic cross-sectional view of the same.

FIG. 4 shows the same immersion type membrane separation device, wherein (a) is a perspective view partially omitted, and (b) and (c) are perspective views of another embodiment.

FIG. 5 is a sectional view of the union joint according to the first embodiment;

FIG. 6 is a plan view of another embodiment of the above.

FIG. 7 is a schematic perspective view of a conventional example.

[Explanation of symbols]

 Reference Signs List 1 diffuser header 2 diffuser 3 treatment tank 4 branch pipe 5 union joint

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor Shin Shin Shin 1048, Kazuma, Kadoma, Osaka Prefecture Inside Matsushita Electric Works, Ltd. F term (reference) 4D006 GA02 HA93 KA44 KB22 PA01 PB08 PC65 4D027 AA03 AA11

Claims (2)

[Claims] 1. A purifying tank in which a plurality of diffuser tubes are branched from a diffuser tube header and introduced into a treatment tank, wherein the length of the plurality of branch tubes formed in the diffuser header and connecting the diffuser tubes is reduced. A septic tank characterized by being different from an adjacent one. 2. A septic tank, wherein a branch pipe and an air diffuser are connected by a union joint.