JPS6010714Y2 - septic tank - Google Patents

Description

[Detailed explanation of the idea] The present invention relates to a septic tank.

Conventionally, there is a separation chamber where the inside of the tank is separated by a partition wall to separate the solid and liquid components in the wastewater, an aeration chamber where the organic components in the wastewater are decomposed using the growth of aerobic microorganisms, and a room where the treated wastewater is discharged. There are septic tanks that are provided with a settling chamber for precipitating solids mixed in treated wastewater.

Then, a hearth is installed in the aeration chamber to enhance the treatment effect when decomposing organic components by aerobic microorganisms.
Treatment is also carried out by attaching aerobic microorganisms.

However, if the aerobic microbial film attached to the surface of the hearth material is left as it is, it will become thick and cause clogging between the filtration materials, which will impede the circulating flow of sewage in the aeration chamber and reduce the treatment effect.

In addition, the microbial film peels off from the surface of the furnace material and circulates in the circulating flow, and a portion of the sludge in the circulating flow flows out of the tank, resulting in a decrease in the quality of the effluent water.

The present invention was developed with the aim of solving the above-mentioned drawbacks, and the organic components in wastewater are decomposed by creating a circulating flow in the aeration chamber at all times. The purpose of the present invention is to provide a septic tank capable of returning sludge to a separation room when it is mixed in.

Next, an example of the septic tank of the present invention will be explained with reference to the drawings.

1 is a tank, and partition walls 2 and 3 are erected in the tank 1 to form a separation chamber A, an aeration chamber B, and a settling chamber C, respectively.

Separation chamber A separates liquid, coarse solids, and foreign matter from the wastewater flowing in from the wastewater inlet pipe 4, and homogenizes the concentration of the wastewater.

Inside the aeration chamber B, an aeration diffuser 5 and a hearth 6 are provided.

Reference numeral 7 denotes a groove-shaped sewage circulation path forming plate, which is formed integrally with the partition wall 2 or formed separately and attached to the partition wall 2 to form a sewage circulation path 8.

The aeration air diffuser 5 is provided laterally along the lower part of the wall on the partition wall 2 side or below the wastewater circulation path 8, and the air sent from the air supply pipe 9 is dispersed from the air diffuser 5, and is disposed in the sewage circulation path. Normally, the upward flow exits from the -L end of the wastewater circulation path 8 and reverses to become a downward flow to form a wastewater circulation flow in the aeration chamber B.

A hearth 6 is provided in the aeration chamber B.

The hearth 6 has a gap in the vertical direction so that a circulating flow can pass therethrough, and is made of, for example, a one-dimensional structure, a stack of plates with many irregularities or protrusions, or a corrugated plate. Furnace materials made of stacked bodies or the like are installed with a gap between the top and bottom, or the like.

Reference numeral 10 denotes a wastewater transfer port, which is formed above the wastewater circulation path 8 of the partition wall 2, and is passed through the wastewater transfer path 13 formed by the cover pipe 12 formed on the wall surface of the partition wall 2 on the separation chamber A side. Normally, wastewater from separation chamber A from which coarse solids and foreign matter have been removed is advected to aeration chamber B.

At a location away from the wastewater transfer port 10, a wastewater transfer port 11 is further formed at the same height as the wastewater transfer port 10, and as in the wastewater transfer port 10, a covered pipe 14 is formed.
is formed on the wall on the separation chamber A side, and is normally connected to the wastewater transfer port 11.
The air is also advected from the separation chamber A to the aeration chamber B through the separation chamber A.

The air diffused from the aeration pipe 5 causes an upward flow in the sewage circulation path 8, and as shown in Fig. 2, the upward flow exits the sewage circulation path 8, reverses, and becomes a downward flow to circulate sewage into the aeration chamber B. A flow is formed.

Due to the circulating flow of the sewage thus generated, an aerobic microbial film adheres to the surface of the furnace material constituting the hearth 6, and the organic components in the sewage are oxidized and decomposed by the aerobic microorganisms.

However, during the aeration process, the microbial film that adheres to the hearth 6 becomes thick, clogging the hearth and impeding the circulation of wastewater.

For this reason, a backwashing diffuser pipe 22 is provided below the hearth 6,
By discharging air from the air pipe 23, the hearth 6 can be backwashed and clogging can be prevented.

24 is a main pipe for supplying air to the air supply pipes 9 and 23.

By backwashing the hearth 6, the microbial film is peeled off and the aeration chamber B
A large amount of sludge floats inside the gap 16 at the bottom of the partition wall 3.
If the amount of sludge in the aeration chamber B becomes large, some of the sludge is returned to the separation chamber A in this invention. It is something to do.

Therefore, in the present invention, a groove-shaped sludge return path forming plate 15 is removably attached to the upper part of the sewage circulation path 8.

For example, as shown in FIG. 6, the sludge return path forming plate 15 has a stepped portion 17 for fitting and locking into the upper end opening of the sewage circulation path forming plate 7, so that it can be easily attached and detached by hand. A handle 18 is provided on the handle.

The sewage circulation path forming plate 15 is removably provided on the upper part of the sewage circulation path 8 so as to cover the sewage transfer port 10, and when this is attached, the sludge generated by the aeration from the aeration pipe 5 is removed. The upward flow containing sludge enters the sludge return path 19 formed by the sludge return path forming plate 15, then enters the casing 12 from the sewage transfer port 10, and is returned from the aeration chamber B to the separation chamber A.

When the sewage containing sludge is returned from the aeration chamber B to the separation chamber A as described above, the amount of sewage in the separation chamber A increases, but the amount from the sewage transfer port 11 is commensurate with the amount of sewage returned. of wastewater is advected from separation chamber A to aeration chamber B, and the water level is kept constant.

Once the sludge has been returned, the sludge return path forming plate 15 is removed and returned to the state shown in FIG. 2.

The wastewater treated by aerobic microorganisms in the aeration chamber B is advected into the settling chamber C through the gap 16 between the lower end of the partition wall 3 and the tank wall, and the supernatant liquid is sterilized in the settling chamber C. The medicine flowing into the tank and eluted from the medicine cylinder 20 is appropriately disinfected and discharged to the outside of the tank 1 from the discharge pipe 21.

According to the septic tank of the present invention, when the sludge return path forming plate 15 is removed from the upper part of the sewage circulation path 8, the upward flow generated in the sewage circulation path 8 due to the aeration from the aeration pipe 5 flows through the sewage circulation path. The action of the aerobic microorganisms that come out from the hearth 6 in the form of a film and multiply 7. The organic components in the wastewater are oxidized and decomposed.

In addition, if a large amount of sludge is suspended in the sewage in the aeration chamber B, if the sludge return path forming plate 15 is attached to the upper part of the sewage circulation path 8, air diffusion from the aeration pipe 5 will remove the sludge. The resulting upward flow containing sludge enters the sludge return path 19 formed by the sludge return path forming plate 15 and is returned to the separation chamber A from the sewage advection port 10.

Therefore, according to the present invention, the sludge in the aeration chamber B can be appropriately returned from the aeration chamber B to the separation chamber A, thereby preventing clogging of the hearth 6 and preventing sludge from entering the settling chamber C.

[Brief explanation of the drawing]

The drawings show an example of the septic tank of the present invention. Fig. 1 is a cross-sectional view taken along the line ■-■ of Fig. 2 with the sludge return path forming plate removed, and Fig. 2 is a longitudinal cross-sectional view of the entire structure taken along the line I-I of the same. side view,
Figure 3 is a longitudinal sectional view taken along the line ■-■ in Figure 2, Figure 4 is a longitudinal sectional view with the sludge return path forming plate attached, and Figure 5 is a perspective view of an example of the sewage circulation path forming plate. FIG. 6 is a perspective view of an example of a sludge return path forming plate. Explanation of symbols: 1...tank, 2, 3...partition wall, 4...sewage introduction channel, 5...aeration diffuser pipe, 6... ... Hearth, 7 ... Sewage circulation path forming plate, 8 ... Sewage circulation path, 9 ...
・Air pipe, IO, IT...Sewage transfer port, 13・
...Sewage advection path, 15...Sludge return path forming plate, 19...Sludge return path.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. The inside of the tank is partitioned to form a separation room, an aeration room, and a settling room, and the aeration room is equipped with an aeration pipe and a hearth. A sewage circulation path is provided in the vertical direction by a groove-shaped sewage circulation path forming plate provided along the wall surface on the aeration chamber side of the partition wall between the two, and a sewage advection port is formed in the partition wall above the sewage circulation path. A groove-shaped sludge return path forming plate having a lower end opening that substantially coincides with the upper end opening of the sewage circulation path forming plate is removably attached to the upper end opening of the sewage circulation path forming plate. When the lower end of the sludge return path forming plate is attached, the sludge return path will be covered by the sludge return path forming plate, and a sludge return path communicating with the sewage advection port will be formed within the sludge return path forming plate. A septic tank that has been 2. The septic tank according to claim 1 of the utility model registration claim, in which a backwashing aeration pipe is provided below the hearth in the aeration chamber. 3. A wastewater transfer port is further formed above the wastewater circulation path at a location apart from the wastewater transfer port formed in the partition wall between the separation room and the aeration room and at the same height as the wastewater transfer port. The septic tank according to claim 1 of the utility model registration claim.