JPS6110797Y2 - - Google Patents

Description

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

Conventionally, the inside of the tank is separated by a partition wall to separate the solid and liquid components in wastewater into a separation chamber, and air is pumped into the wastewater to create a circulating flow to decompose organic components using the growth of aerobic microorganisms. There are some septic tanks that are equipped with an aeration chamber for discharging the treated sewage, and a settling chamber for settling solids mixed in the treated sewage before it is discharged.

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, a part of the wastewater containing the settled sludge at the bottom of the settling chamber is sucked into the aeration chamber from between the tank wall at the bottom end of the settling chamber. At the same time, some of the treated sewage in 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, and the sewage flows into the settling chamber. The force of the inflowing sewage becomes stronger, causing sludge to float in the settling chamber, lowering the clarity and deteriorating the quality of the treated sewage discharged outside the tank.

The present invention was developed with the aim of eliminating such drawbacks, and by relaxing the downward circulation flow along the partition wall between the aeration chamber and the settling chamber, the sludge in the settling chamber can be removed. The purpose of the present invention is to provide a septic tank that can prevent a decrease in clarity and a deterioration in the quality of discharged water due to floating of water.

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.

The bottoms of the advection tubes 5, 5 are closed and have sloped surfaces 6, 6.
This is done to avoid turbulence in the circulating flow. Advection ports 7, 7 are formed in the partition wall 2 to communicate from the separation chamber A to the lower portions of the advection tubes 5, 5, respectively.
Further, the upper portions of the advection pipes 5, 5 have openings 8, 8, and the sewage in the separation chamber A passes through the advection ports 7, 7, flows upward within the advection pipes 5, 5, and is aerated from the openings 8, 8. The air is advected to room B.

Since the upper ends of the advection pipes 5, 5 are obliquely cut out, the openings 8, 8 have approximately V-shaped weirs, and the advection to the aeration chamber B is facilitated. Reference numeral 9 denotes an aeration pipe, which is provided below the advection pipes 5, 5 of the partition wall 2, substantially laterally along the wall surface on the side of the aeration chamber B, and is located between the advection pipes 5, 5. An air supply pipe 10 is connected to the air diffuser pipe 9, and compressed air is sent through the air supply pipe 10 from outside the tank 1. The air ejected from the diffuser pipe 9 is transferred to the advection pipes 5, 5 of the partition wall 2.
Aeration chamber B rises along the wall between
Create a circulating flow in the wastewater inside. The advection pipes 5, 5 have the function of regulating the flowing direction of the circulating flow. Aerobic microorganisms breed in the sewage circulation in aeration room B.
Due to this action, organic components in wastewater are oxidized and decomposed.

However, if this continues, the sewage circulation flow rising between the advection pipes 5 and 5 will have a strong force even in the upper part, and the air released from the aeration pipe 9 will not be retained in the sewage for a long enough time and will flow upwards in the tank 1. Since the oxygen is released, the efficiency of oxygen supply to wastewater cannot be sufficiently increased. In addition, if the downward circulation flow along the partition wall 3 becomes strong, the suction of wastewater from the settling chamber C to the aeration chamber B through the space 15 will be strong, so that conversely, the sewage will be sucked from the settling chamber C to the aeration chamber B through the gap 15. The force of the sewage flowing into C becomes stronger, and sludge floats in settling chamber C, reducing the degree of clarity.

In order to eliminate such inconvenience, in the present invention, a baffle plate 11 is provided between adjacent advection tubes 5, 5. Since the baffle plate 11 is provided in a substantially lateral direction between the adjacent advection tubes 5, 5, the upward circulation flow once hits the baffle plate 11 and then flows further upwards in the tank, so that a gentle circulation flow occurs above the tank. It can be changed. The baffle plate 11 may be formed, for example, in the shape of an upwardly sloping eave as shown in FIG. Alternatively, the baffle plate 1 may be formed as shown in C.
1 may be formed in a step shape.

By providing the baffle plate 11 in this manner, the circulation flow above the tank is weakened, the retention time of the air released from the aeration pipe 9 in the waste water is increased, and the oxidative decomposition treatment effect is improved. By weakening the force of the downward circulation flow along the partition wall 3, it is possible to prevent the wastewater containing sludge in the aeration chamber B from entering the settling chamber C with great force.

A disinfection chamber D is appropriately provided above the settling chamber C, and the supernatant liquid of the treated wastewater in the settling chamber C is advected to the disinfection chamber D. In the disinfection chamber D, disinfection is performed with the disinfectant supplied from the medicine cylinder 12, and then discharged to the outside from the discharge pipe 13. 14,14,
14 are inspection ports, into which respective inspection lids are fitted.

According to the septic tank of the present invention, since it has the above-mentioned configuration, the sewage circulation flow rising between the advection pipes 5 and 5 is weakened by the baffle plate 11 and turns into a gentle circulation flow above the tank, and the sewage circulation flow rises between the advection pipes 5 and 5. By weakening the force of the downward circulating flow along the flow, it is possible to prevent the sewage containing sludge from the aeration chamber B from entering the settling chamber C. This will help prevent water quality from deteriorating.

[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. 1, and FIGS. 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 ... Baffle plate, 12 ... Medication cylinder, 1
3...Discharge pipe.

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 a plurality of partitions are installed approximately vertically on the partition wall between the separation chamber and the aeration chamber on the aeration chamber side. advection pipes are provided at intervals, the advection pipes are open at the top and closed at the bottom, and the partition wall provided with the advection pipes has an advection port communicating from the separation chamber to the bottom of the advection pipes. A septic tank in which a diffuser pipe is provided along a partition wall below the advection pipe, and a baffle plate is provided between adjacent advection pipes. 2. The septic tank according to claim 1, wherein a baffle plate is provided substantially laterally between adjacent flow pipes. 3 Utility model registration claim paragraph 1 or 2 in which a baffle plate is formed in the shape of an eave between adjacent transfer pipes
Septic tank as described in section. 4. The septic tank according to claim 1 or 2, wherein a plurality of baffle plates are provided vertically between adjacent flow pipes to form a curved flow path. 5 Utility model registration claim paragraph 1 or 2 in which a stepped baffle plate is provided between adjacent transfer pipes
Septic tank as described in section.