JPS5843989Y2 - septic tank - Google Patents

Description

[Detailed explanation of the idea] This invention relates to a separate aeration type septic tank.

Conventionally, this type of septic tank has been constructed as shown in FIG.

1 is a separation chamber, and the solid content contained in the inflow water W is separated by precipitation in this separation chamber 1.

The separated liquid from which the solids have been removed is advected to the aeration chamber 2 via the advection pipe 4.

The advection tube 4 is provided approximately at the center.

The separated liquid advected to the aeration chamber 2 is aerated by the diffuser 5.

Considering the effects of aeration, etc., this multiplexer 5 is installed directly below the aeration chamber side opening of the advection pipe 4.

The aerated water aerated in the aeration chamber 2 is discharged to the outside via the precipitation chamber 3.

However, with such a configuration, when the water levels in the separation chamber 1 and the aeration chamber 2 are almost equal, part of the circulating flow in the aeration chamber 2 caused by the diffuser 5 flows back toward the separation chamber 1. This has the drawback that a large amount of activated sludge in the aeration chamber 2 is returned to the separation chamber 1 over a long period of time, making the treatment function unstable.

This idea was made to eliminate these drawbacks, and by providing a baffle on the aeration chamber side to prevent the circulating flow from flowing back into the advection port, a septic tank with stable functionality was created. It is intended to provide.

Hereinafter, one embodiment of this invention will be described in detail with reference to FIGS. 2 and 3.

Reference numeral 7 denotes a partition wall that partitions the separation chamber 1 and the aeration chamber 2, and the advection pipe 4 is provided in the center of the partition wall.

The aeration chamber side opening of this advection pipe 4 is opened to approximately the liquid level.

A baffle 6 is fixed to the partition wall 7 above the diffuser 5.

This baffle 6 includes a vertical support portion 6a at the lower end fixed to the partition wall 7 by bolts, and a vertical support portion 6a at the lower end.
It consists of an inclined part 6b supported by.

The inclined part 6b has an upper part separated from the partition wall 7 to form a kind of settling chamber, and is supported with its inclined surface facing the circulating flow (arrow) in the aeration chamber 2. is prevented from flowing back into the opening of the advection tube 4.

At the same time, communication portions are formed on both sides, and the opposite side faces the advection tube 4, so that the separated liquid supplied from the advection tube 4 is distributed to both sides as shown by the arrow in FIG.
to be introduced within.

In this way, backflow can be reliably prevented without particularly affecting the circulating flow within the aeration chamber 2.

It is also possible to prevent backflow by setting the advection section higher than the liquid level in the aeration tank and increasing the liquid level in the separation chamber accordingly.

However, if this is done, the discharge water level of the aeration tank will be lowered, making it impossible to discharge water depending on the installation location.

Further, if there is a difference in water level between the separation chamber and the aeration chamber, it is not preferable because the strength of the partition wall must be increased.

As described above, according to this invention, a baffle is provided to prevent the backflow of the circulating flow, so the activated sludge in the aeration chamber is prevented from being sent back to the separation chamber, and the septic tank can function stably. can.

Furthermore, the circulating flow itself is more effectively rectified.

[Brief explanation of the drawing]

FIG. 1 is a plan view of a conventional septic tank, FIG. 2 is a sectional view of a main part of an embodiment of this invention, and FIG. 3 is a plan view of the main part. 1... Separation room, 2... Aeration room, 4...
... Advection tube, 5 ... Tiff user, 6 ...
... Baffle, 6a... Support part, 6b...
... Slanted part, 7 ... Partition wall.

Claims (1)

[Scope of utility model registration request] a separation chamber that separates solids in inflowing wastewater; an aeration chamber that aerates the separated liquid separated in this separation chamber; a partition wall that partitions this aeration chamber and the separation chamber; and a lower end attached to the partition wall. and a baffle provided at a separated liquid advection section from the separation chamber in the aeration chamber, the upper part of which is spaced apart from the partition wall, and communication sections are formed on both sides of the aeration chamber.