JPS629999Y2 - - Google Patents

Description

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

Conventionally, the inside of the tank is divided by a partition wall, and there is a separation chamber that separates the solid and liquid components in the wastewater, and air is sent into the wastewater to create a circulating flow and organic components are removed using aerobic microexudate growth. There is a septic tank that is provided with an aeration chamber for decomposition treatment and a settling chamber for settling solids mixed in the treated sewage prior to discharging the treated sewage.

The sewage in the aeration chamber of such a septic tank rises along the partition wall between the separation chamber and the aeration chamber due to the air released from the aeration pipe, turns over above, and flows up the partition wall between the aeration chamber and the settling chamber. The circulation is repeated by descending along the tank and rising again from the bottom of the tank.

Then, due to the downward flow along the partition wall between the aeration chamber and the settling chamber, part of the wastewater containing the settled sludge at the bottom of the settling chamber is sucked into the aeration chamber from the gap between the bottom end of the settling chamber and the tank wall. At the same time, some of the treated sewage from the aeration chamber enters the settling chamber, but when the circulation flow becomes strong, the sewage is strongly sucked into the aeration chamber by the downward flow, so it flows into the settling chamber. The force of the sewage becomes stronger, and sludge floats in the settling chamber, reducing the clarity and degrading the quality of the treated sewage discharged outside the tank.

The present invention was developed with the aim of eliminating such drawbacks, and by partially relaxing the circulation flow near the bottom of the partition wall between the aeration chamber and the settling chamber, wastewater can be removed. Weakens the force of wastewater flowing into the settling chamber without reducing the treatment effect of circulation,
The purpose of the present invention is to provide a septic tank that can prevent a decrease in clarity due to sludge floating in a settling chamber and a deterioration in the quality of discharged water.

The gist of the present invention is that the tank 1 is partitioned to form a separation chamber A, an aeration chamber B, and a settling chamber C;
The septic tank has a bag-shaped recess 12 that opens toward the aeration chamber B at the lower part of both sides of the partition wall 3 between the settling chamber and the settling chamber C.

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.

On the wall surface of the partition wall 2 between the separation chamber A and the aeration chamber B on the side of the aeration chamber B, two advection pipes 5, 5 are provided at intervals on both sides. In this example, the advection pipes 5, 5 are formed by a partition wall 2 bulging out toward the aeration chamber B side in a substantially vertical direction, and a contact plate 6 being attached to the wall surface on the opposite side. The lower portions of the advection pipes 5, 5 are closed, and the side surfaces facing the tank wall of the aeration chamber B are sloped surfaces 7, 7, so as not to cause disturbance to the circulating flow. A through hole opening from the separation chamber A to the advection pipes 5, 5 is formed in the partition wall 2. Further, the upper portions of the advection pipes 5, 5 are provided with openings 8, 8, so that the wastewater in the separation chamber A flows through the advection pipes 5, 5, and is advected from the openings 8, 8 to the aeration chamber B. There is.

Reference numeral 9 denotes an aeration pipe, and the advection pipe 5 of the partition wall 2,
It is fixed substantially laterally along the wall surface on the aeration chamber B side below the point 5. An air supply pipe 10 is connected to one end of the aeration pipe 9, and the air supply pipe 10 is connected from outside the tank 1.
Compressed air is pumped through. The air ejected from the aeration pipe 9 rises along the wall surface between the advection pipes 5, 5 of the partition wall 2, thereby causing the wastewater in the aeration chamber B to circulate. The advection pipes 5, 5 have the function of regulating the flowing direction of the circulating flow. Aerobic microorganisms proliferate in the sewage circulation in the aeration chamber B, and organic components in the sewage are oxidized and decomposed by their action. The partition wall 3 between the aeration chamber B and the settling chamber C is inclined toward the tank wall, and a bent wall 19 is formed at the lower end on the settling chamber C side, and a gap 11 is formed between the partition wall 3 and the tank wall. is provided to communicate the aeration chamber B and settling chamber C.

A bag-shaped recess 12 that opens toward the aeration chamber B side is formed at the lower part of both sides of the partition wall 3 between the aeration chamber B and the settling chamber C. The bag-shaped recess 12 is formed by bending the lower wall surfaces of both sides of the partition wall 3 toward the settling chamber C side, and the side edges of the sleeve wall 13 are integrated with the wall surface of the tank wall in a watertight manner. It is formed by A part of the downward circulating flow along the partition wall 3 flows into the bag-shaped recess 12 at the lower part of both sides of the partition wall 3 and the circulating flow is relaxed, so that a part of the circulating flow is transferred to the settling chamber C. It has the function of preventing the circulation flow from being strongly influenced by the settling chamber C when flowing into the settling chamber C. Therefore, due to the bag-shaped gap 12 being formed, the sewage in the aeration chamber B does not enter the settling chamber C with a strong force, and a large amount of sludge enters the settling chamber C and is not clarified. It will not cause any deterioration in quality.

On the wall surface of both sides on the aeration chamber B side of the partition wall 3 between the aeration chamber B and the settling chamber C, a rectifying plate 14 is provided above the bag-shaped recess 12 formed at the lower part of both sides of the partition wall 3. 14 may be formed. rectifying plate 14,
14 is provided from the side end of the partition wall 3 to the middle direction, and has a downward slope. Current plate 1
4 and 14 relieve the circulation flow at the lower part of the partition wall 3,
The effect of circulating flow in the bag-like recess 12 is reduced. Furthermore, since the rectifying plates 14, 14 are provided on both sides of the partition wall 3 and not in the center, the circulating flow becomes a strong flow between the central parts, and since the rectifying plates 14, 14 are provided on both sides of the partition wall 3, the circulating flow becomes strong between the central parts. A strong downward circulation flow is formed in the central part, and the oxidation and decomposition of wastewater is effectively carried out.

Due to the circulating flow in the aeration chamber B, the sewage containing settled sludge in the settling chamber C is sucked into the aeration chamber B, and the sewage in the aeration chamber B flows into the settling chamber C from the gentle downward circulating flow. will flow in.

Although some sludge is contained in the sewage that has flowed into the settling chamber C, the sludge settles within the settling chamber C, and the sewage in the upper part becomes highly clear.

A disinfection chamber D is appropriately provided in the upper part of the settling chamber C, and the supernatant liquid of the treated wastewater in the settling chamber C is transferred to a communication pipe 1.
5 to the disinfection room D. In the disinfection chamber D, disinfection is performed with the disinfectant supplied from the disinfectant cylinder 16, and then discharged to the outside from the discharge pipe 17.
Reference numerals 18 and 18 are inspection ports into which a manhole cover is fitted.

According to the septic tank of the present invention, the partition wall 3 in the aeration chamber B
The downward circulating flow along the partition wall 3 flows into the bag-shaped recess 12 at the lower part of both sides of the partition wall 3 and is relaxed, so that when a part of the circulating flow flows into the settling chamber C, the influence of the circulating flow is It will be strongly inferior to room C,
This prevents sewage from entering the settling chamber with a strong force. Furthermore, a large amount of sludge will not enter the settling chamber C and cause a decrease in clarity, and the quality of the discharged water will not deteriorate.

[Brief explanation of the drawing]

FIG. 1 is a longitudinal sectional view showing an example of the septic tank of the present invention;
Figure 2 is a vertical sectional view taken along the same line as above;
The figure is a partial cross-sectional view taken along the - line in FIG. 2, and FIG. 4 is a longitudinal sectional view taken along the - line in FIG. 1. Explanation of symbols, A...Separation room, B...Aeration room, C
...Sedimentation room, D...Disinfection room, 1...Tank, 2, 3...
...Partition wall, 5...Advection pipe, 9...Diffusion pipe, 10...
... Air pipe, 11 ... Gap, 12 ... Bag-shaped recess, 1
3...Sleeve wall, 14...Brectifier plate.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. The inside of the tank is partitioned to form a separation chamber, an aeration chamber, and a settling chamber, and there are openings on the aeration chamber side at the lower part of both sides of the partition wall between the aeration chamber and the settling chamber. A septic tank with a bag-like recess formed in it. 2 The side edges of the wing walls formed by bending the lower walls on both sides of the partition wall between the aeration chamber and the settling chamber toward the settling chamber are integrated with the tank wall in a watertight manner. The septic tank according to claim 1, wherein a bag-like recess is formed by being removed. 3. Utility model registration claim 1 or 2, in which a rectifying plate is provided above the bag-shaped recess of the partition wall between the aeration chamber and the settling chamber from the side edge of the partition wall to the middle direction. Septic tank as described in section. 4. The septic tank according to claim 3 of the utility model registration claim, wherein the current plate has a downward slope from both sides of the partition wall between the aeration chamber and the settling chamber to the middle direction.