JP3874894B2 - Wastewater treatment equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a wastewater treatment apparatus suitable for treating muddy water discharged to the ground through a shaft when a pipe is buried in the ground.
[0002]
[Prior art]
Conventionally, as a means of burying small-diameter pipes for various uses including underground water and sewer pipes, a shaft is excavated from the surface, and a pipe burying device is installed in the shaft to push the pipe while excavating the underground. The method of burying is taken.
[0003]
The underground spring water generated when excavating the above ground flows into the shaft, but this water is stored in a water storage tank provided at one corner of the shaft, and the water stored in this water storage tank is used using an underwater pump. The water is pumped out of the vertical shaft and directly into the sewer.
[0004]
[Problems to be solved by the invention]
However, the above drainage is muddy water mixed with excavated earth and sand, and when this muddy water is pumped to the surface and drained into the sewer, there is a risk of clogging the sewer pipe when there is a lot of mud component in the drainage. .
[0005]
[Means for Solving the Problems]
The present invention has been made in order to solve the above-mentioned conventional problems, and includes a precipitation tank installed at a lower part, a precipitation accelerator tank installed at the upper part of the precipitation tank, and a tank adjacent to the tank. And an agitation tank for agitating and mixing the precipitation accelerator supplied from the tank and the drainage pumped up from the shaft, and a drainage pipe for discharging the supernatant water of the drainage in the sedimentation tank. It is characterized by being provided so as to be tiltable so that it can take a normal level position and a low level position during mud discharge, and a chute that tilts downward toward the discharge port at the bottom of the settling tank.
[0006]
With the above configuration, the precipitation accelerator is mixed and stirred in the waste water in the stirring tank, and then flows into the precipitation tank for precipitation, and the supernatant water is discharged through the drain pipe. When the sedimented mud components are discharged and recovered, the drain pipe is tilted, and the supernatant water is discharged to a low level, and then the mud components and the like are recovered from the discharge port of the sedimentation tank.
[0007]
DETAILED DESCRIPTION OF THE INVENTION
The present invention will be described below with reference to embodiments shown in the drawings.
[0008]
FIG. 1 is a front view of an embodiment of a wastewater treatment apparatus according to the present invention, and as shown in FIG. 2, a sedimentation tank 1 is supported at a lower part by a base 2 at a position slightly lifted from the ground. In addition, a precipitation accelerator tank 3 and a stirring tank 4 are installed in parallel in the upper part of the precipitation tank 1.
[0009]
The precipitation accelerator tank 3 is provided with a supply pipe 5 for supplying a precipitation accelerator, for example, a polymer flocculant, to the upper part of the agitation tank 4 from the bottom of the tank. Is connected.
[0010]
As shown in FIG. 3, a pumping pipe 7 for introducing muddy water from a shaft not shown in the figure is connected to the upper part of the stirring tank 4, and drainage is supplied into the stirring tank 4 by a pumping pump 8. A stirring blade is provided in the stirring tank 4, and the shaft 10 of the stirring blade 9 is driven to rotate by a motor 11 so as to mix and stir the drainage and the precipitation accelerator.
[0011]
A discharge pipe 13 is connected to the lower part of the agitation tank 4 via a valve 12 (butterfly valve), and the discharge pipe 13 is connected to face the upper part of the sedimentation tank 1.
[0012]
A bottom portion of the sedimentation tank 1 is a chute 15 inclined downward toward the discharge port 14, and a lid plate 16 is pivotally supported by a shaft 17 on the discharge port 14 so as to be opened and closed. It can be opened and drained in this manner, and is configured to be fixed in a closed state by a fastener such as a bolt (not shown) at the time of closing.
[0013]
A drain pipe 18 is provided inside one side of the precipitation tank 1. The drain pipe 18 has an L shape connected to a drain main pipe 19 outside the settling tank 1 via a rotary joint 20 and rotates a handle 21 fixed to the rotary joint 20 portion. As shown in FIG. 6, the drain pipe 18 can be tilted from a vertical position to a horizontal position, and when the drain pipe 18 is in a vertical position, its open end 18a is in the sedimentation tank 1. It is set so that the amount of water discharged at the time of mud discharge is minimized by opening and tilting to the normal level (L) position of the supernatant water 22 to lower the water level of the supernatant water 22. Reference numeral 23 in the figure denotes a stopper for defining the rotation range of the handle 21. Although not shown, the handle 21 can be fixed at a desired rotation position. ing.
[0014]
As a method of controlling the drive system of each part, for example, a detection means for detecting the presence or absence of a reference amount of the precipitation accelerator is provided in the precipitation accelerator tank 3, and this detection means detects the presence of the reference amount of the precipitation accelerator. If not, make sure that the main switch is not turned on. The stirring tank 4 is provided with a flow switch, and the pumping pump 8 is stopped when a certain amount of muddy water is introduced into the tank.
[0015]
Next, the operation of the above embodiment will be described.
[0016]
Prior to the waste water treatment, the handle 21 is operated to place the drain pipe 18 in an upright posture, while drainage (muddy water) accumulated in the shaft is pumped up by the pump 8 for pumping and supplied into the stirring tank 4 through the pump pipe 7. At the same time, the precipitation accelerator is supplied from the precipitation accelerator tank 3 through the supply pipe 5 by driving the supply pump 6, and both are stirred and mixed in the stirring tank 4 by the rotation of the stirring blade 9.
[0017]
The waste water mixed with the precipitation accelerator is sequentially sent into the precipitation tank 1 by opening the valve 12, and in this precipitation tank 1 mud components and the like settle downward due to the difference in specific gravity, and the supernatant water 22 is formed above. Is done. When the supernatant water 22 passes over the open end 18a at the upper end of the drainage pipe 18 standing upright, it flows into the drainage pipe 18 and is discharged, and then flows through the drainage main pipe 19 to the sewer pipe.
[0018]
When the settled mud component is accumulated, the handle 21 is rotated to tilt the drain pipe 18, the position of the opening end 18a is lowered to lower the water level of the supernatant water 22, and the drainage of the supernatant water is finished. If the tilting of the drain pipe 18 is stopped, the soil removal bucket of the excavator is placed directly under the discharge port 14 and the cover plate 16 is opened, the settled mud component slides on the shoe 15 and enters the soil discharge bucket from the discharge port 14. Discharged.
[0019]
When the mud component is completely discharged, the cover plate 16 is closed, the drain pipe 18 is returned to the upright posture, and the above-described operation is performed again.
[0020]
When the polymer flocculant is actually used as the precipitation accelerator, the pumping pump 8 is stopped when the wastewater is supplied to the agitation tank 4 and accumulated in the flow switch, and at the same time, the precipitation accelerator supply pump 6 and the agitation are mixed. Although the motor 11 is operated, the pump 6 can be sufficiently stirred and mixed by operating for about 20 seconds and the motor 11 for 1 minute.
[0021]
After the stirring motor 11 is stopped, the valve 12 is preferably opened for 3 minutes by a timer, and sequence control is preferably performed so that the mixed liquid from the stirring tank 4 flows into the precipitation tank 1.
[0022]
【The invention's effect】
As described above, according to the present invention, it is possible to separate the mud components from the muddy water generated in the shaft where the small-diameter pipe burying device or the like is installed, and to discharge only the supernatant water. Will not cause problems such as clogging the sewer pipe.
[0023]
In addition, by installing a drain pipe in the sedimentation tank so that it can be tilted, only the supernatant water can be drained accurately regardless of the volume of the sedimented mud component, and the amount of mixed water is minimized when the mud component is discharged. Can be suppressed.
[Brief description of the drawings]
FIG. 1 is a front view showing an embodiment of a wastewater treatment apparatus according to the present invention.
FIG. 2 is a plan view of the same.
3 is a cross-sectional view showing details of a precipitation accelerator tank and a stirring tank portion of FIG. 1. FIG.
4 is a left side view of FIG.
FIG. 5 is an enlarged view of a part A in FIG. 1;
FIG. 6 is an explanatory view showing a tilted state of the water distribution pipe.
FIG. 7 is a schematic cross-sectional view of a precipitation tank.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Precipitation tank 3 Precipitation acceleration tank 4 Agitation tank 5 Precipitation acceleration supply pipe 6 Precipitation accelerator supply pump 7 Pumping pipe 8 Pumping pump 9 Stirring blade 11 Stirring motor 12 Valve 13 Drain pipe 14 Outlet 15 Chute 16 Cover plate 18 Drain pipe 19 Drain main pipe 20 Rotary joint 21 Handle

Claims (1)

The precipitation tank installed in the lower part, the precipitation accelerator tank installed in the upper part of the precipitation tank, the precipitation accelerator installed next to the tank and the waste water pumped up from the shaft are mixed with stirring. A drainage pipe for draining the supernatant water in the settling tank so that the opening end thereof can be tilted so that the normal level position of the supernatant water and the low level position during the drainage can be taken. A wastewater treatment apparatus characterized in that the bottom of the settling tank is a chute that is inclined downward toward the discharge port.

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