JPS5839839Y2 - Aeration type sewage septic tank - Google Patents

Description

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

Conventionally, it has been known that it is effective to purify sewage by supplying a large amount of air to oxidize putrefactive sludge and turn it into inorganic substances. Septic tanks are widely used.

By the way, when aeration is performed in the above-mentioned septic tank, the so-called separated type sewage septic tank is highly efficient, in which the sediment is separated in advance, and then only the upper liquid is transferred to another chamber, where it is purified by aeration. However, this type of septic tank requires several rooms separated by partition walls, such as a separate sedimentation chamber, an aeration chamber, and a settling chamber, so it is not possible to use a relatively small septic tank like a household septic tank. When it comes to objects, the horizontal cross-sectional shape of each chamber tends to be a flat rectangle.

However, especially when the shape of the aeration chamber is flat, even if the aeration tube A that supplies air is placed toward the lower corner of the chamber as shown in Figure 1, the water flow generated by the rising bubbles B will be Since the inside of the aeration chamber is sandwiched between spaces, partial convection (arrow P) tends to occur, and the convection does not circulate uniformly within the room.As a result, the aerated wastewater is unevenly distributed in some areas, resulting in uniform treatment. There was a drawback that it was difficult to expect.

Furthermore, since the aeration pipe A is arranged at the lower corner of the aeration chamber, when fibrous materials such as hair get wrapped around the pipe, a so-called reverse flow is caused, which causes a reflux to flow in the opposite direction inside the tank. It has a drawback that it is difficult to remove even if it is washed.

In view of the above-mentioned drawbacks, this invention provides an aeration-type sewage septic tank that can provide stable convection even in a flat aeration chamber and can efficiently remove hair during backwashing. This was done for the purpose of are arranged in the width direction.

Next, this invention will be explained using examples.

Figure 2 is a sectional view of the main part of an embodiment of this invention, and Figure 3 is a cross-sectional view of the main part of the embodiment of this invention.
Figure 4 is a sectional view taken along line lll-■II in the figure, and Figure 4 is IV- in Figure 2.
It is a sectional view taken along the line IV.

The aeration type sewage septic tank 1 of this invention is composed of a sedimentation separation chamber 11, an aeration chamber 12, a sedimentation chamber 13, etc., and its horizontal cross-sectional shape is such that the length of the long side is the length of the short side as shown in FIG. almost 2 of
In the aeration chamber 12, which has a flat rectangular shape that is double or larger in size, a third As shown in the figure or Fig. 4, the air diffuser 12B
are constructed by spanning in the width direction.

Further, it is preferable that a support member 12C having a U-shaped cross section is disposed below the diffuser pipe 12B and supported by the side walls 12A, 12A.

The improved trachea 12B has air ejection holes 12B' on the upper surface.
...12B' is a tubular body with a large number of holes, and one end is connected to the air pipe 14.

The receiver member 12C is fixed to brackets (12D, 12D) integrally projecting from the side walls 12A, 12A, and is fixed at a position away from the bottom surface 12' of the aeration chamber 12.

This receiver uses member 12C to remove floating foreign matter in the waste water from the air diffuser pipe 1.
Direct entanglement with 2B is prevented.

FIG. 5 is an explanatory diagram showing the usage state of the embodiment of this invention, in which the aeration pipe 1 is placed in the waste water W filled in the aeration chamber 12.
When air is ejected through 2B, the bubbles B are directed upwardly from the longitudinal centerline of the chamber 12, thereby creating an upward flow (arrow Q).

This upward flow (arrow Q) causes a flow to split into two directions along the longitudinal direction at the water surface W', resulting in two convection currents (arrow Q1) circulating in opposite directions within the chamber 12.
．． Q2) occurs.

In both of these convection flows (arrows Q1 and Q2), the distance d between the opposing flow layers is sufficiently separated from the shape of the chamber 12, so that the flow circulates uniformly within the chamber 12, and the sewage W is Uniform aeration is achieved.

Note that the side wall 12A between the aeration chamber 12 and the precipitation chamber 13 is
As shown in FIG. 4, since the lower end is connected, the flow of the circulation convection described above becomes parallel to the lower communication opening surface of the side wall 12A, and this flow causes turbulent flow only at the bottom of the settling chamber. By stirring the bottom part, excessive accumulation of sediment in the settling chamber is effectively prevented, and the function of the settling chamber is prevented from being impaired.

Since this idea is constructed as described above, uniform aeration treatment is possible even in a diffused sewage septic tank where the shape of the aeration chamber is relatively flat. According to the above, uniform aeration treatment is possible even if the cross-sectional shape of the aeration chamber is flat, so it is possible to downsize the septic tank without impeding the aeration efficiency, and it is possible to reduce the amount of water caused by the aeration pipe. The circulating convection stirs the sediment in the settling chamber only at its bottom, and this stirring flow can also advect the sediment back into the aeration chamber, preventing the function of the settling chamber from being impaired by excessive sedimentation. It is.

When the U-shaped member is disposed below the air diffuser, there is no risk of foreign matter such as hair getting entangled directly in the air diffuser, and air jetting will not be hindered by these foreign objects.

Furthermore, since it is supported at a position away from the bottom of the aeration chamber, it has various practical effects such as easy removal of foreign matter even when backwashing is performed and maintenance is easy.

[Brief explanation of the drawing]

Fig. 1 is an explanatory diagram of a conventional example, Fig. 2 is a horizontal sectional view of an embodiment of this invention, Fig. 3 is a sectional view taken along the line III-I in Fig. 2, and Fig. 4 is an IV in Fig. 2. -IV line sectional view and FIG. 5 are explanatory diagrams showing the usage state of the embodiment. 1... Aeration type sewage septic tank, 11... Sedimentation separation room, 12... Aeration room, 13...
Sedimentation chamber, 12A...Side wall, 12B...
Diffuser pipe, 12C...The receiver is a component.

Claims (1)

[Scope of utility model registration request] The aeration chamber has a flat rectangular horizontal cross section, and is characterized by an aeration pipe disposed in the width direction at the center in the longitudinal direction below a pair of opposing side walls forming the long sides of the train. Aeration-type sewage septic tank.