JPS63182096A - Method for preventing generation of spoilage and malodor in drain tank for building - Google Patents

Abstract

PURPOSE:To prevent the anaerobic spoilage of drain water, by a method wherein an aeration stirring apparatus is provided to a drain tank for a building and the drain water is stirred while air is supplied to the drain water to absorb and grind suspended scum. CONSTITUTION:When a motor 11 is driven, a stirring blade 12 is rotated through a hollow shaft 16 to generate a downward water stream around said blade 12. Therefore, a negative pressure part is generated at the lower end of the hollow shaft 16 and the air sucked from the suction hole 16H opened to the upper part of the hollow shaft 16 passes through the hollow part of a hollow shaft 52 to reach the opening port 16T at the lower leading end of the hollow shaft 16 and mixed with the water stream while the water stream mixed air bubbles is changed to the stream in a horizontal direction by an L-shaped or dog-legged draft tube 13 and forcibly emitted into a tank 1 in a predetermined direction. By this method, the generation of the spoilage and malodor in the tank can be prevented.

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention prevents wastewater from rotting and generating bad odors in building drainage tanks such as gray water tanks, kitchen drainage tanks, sewage tanks, and pump wells. It's about how to do it.

[Conventional technology and its problems]

Buildings constructed in recent years generally have a number of living or commercial spaces underground, and these living or commercial spaces generate a large amount of various types of wastewater.

However, if this drainage source is lower than the public sewerage drainage facility, naturally it is not possible to perform so-called natural discharge. A building drainage tank is installed that collects wastewater by gravity and then discharges it to the public sewerage facility using a drainage pump.

In addition, even drainage from the ground floor may exceed the capacity of the public sewer system if it is discharged all at once, so pump wells and the like are installed to buffer the amount of water.

Conventionally, building drainage tanks and pump wells have not been required to have any function other than temporary storage, so they are simply equipped with water tanks. Nevertheless, because wastewater is stored in the tank, and the inflow and discharge are irregular, the wastewater in the tank often rots anaerobically and gives off a strange odor. For this reason, attempts have been made to install a blower to eliminate the odor in the drain tank, but as a result of fluctuations in the liquid level due to the amount of inflow and discharge water, the piston effect of the liquid level inhibits the odor evacuation function of the blower. However, it has not been possible to achieve sufficient effects.

In addition, as a method to prevent the occurrence of putrefaction and bad odors, it has been proposed and implemented to increase the number of times the pump is operated so that the wastewater does not remain in the tank for a long time. However, it is difficult to drain all the wastewater in the tank, and the sludge that accumulates at the bottom of the tank and scum on the water surface cannot be pumped out, and this sludge and scum rot and rot.
This was causing a bad odor. Furthermore, because almost no wastewater flows in at night, the pump stops operating for a long time.
Corruption had progressed further.

The object of the present invention is to prevent the occurrence of putrefaction and bad odors in the tank by stirring, aerating, and crushing the scum in the wastewater in the tank.

Measures to solve problem c] Equipped with an aeration and agitation device in a building drainage basin, etc., which agitates and agitates the wastewater in the tank while supplying air, and also absorbs and crushes floating scum. Prevent sludge accumulation, scum formation, and anaerobic decay of wastewater.

〔Example〕

Next, a first embodiment of the present invention using a self-priming aerator using a submersible motor shown in FIG. 1 will be described.

In the figure, reference numeral 1 denotes a drainage tank provided to have a required volume in the open floor of a building, and an aeration device 3 is installed at a desired position on the bottom 2 of this drainage tank 1. This aeration device 3 is operated by an underwater motor (
It consists of an electric or hydraulic motor) 4, a stirring blade 5, a draft tube 6, and an air blowing pipe 7. The submersible motor 4 is fixed to the bottom of the tank, and the upper end 6a of the submersible motor 4 extends in a trumpet shape, and the lower part 6b is integrally provided with a draft tube 6 bent in an L-shape along the bottom of the tank. A stirring blade 5 driven by the motor is provided inside. An air blowing pipe 7 is provided in the draft tube 6 so that the air blowing lower a is located approximately at the center of rotation and inserted into the inner diameter of the tip of the stirring blade.

The upper end of the air blowing pipe 7 is a pipe having a diameter such that it is always open to the atmosphere even if the water level fluctuates, and the required amount of air is blown into the liquid.

Therefore, in the device configured as described above, the underwater motor 4
When driven, the stirring blade 5 rotates and stirs the waste water in the tank. This generates negative pressure in the liquid at the tip of the blade. With this negative pressure, air is blown into the liquid from the atmosphere through the air blowing pipe 7, mixed with the stirring flow of waste water in the draft tube, and pushed out toward the front of the draft tube.

The air blowing lower a of this air blowing pipe is inserted into the inner diameter of the stirring blade, making the most of the negative pressure to blow a large amount of air into the drainage water. This prevents collision with the stirring blade. Also, it does not obstruct water flow.

In addition, the floating scum 8 provided at both ends of the air blowing lower a to prevent upward flow is caused to flow into the draft tube together with the waste water flowing into the draft tube by the driving of the stirring blade.
It is crushed by the stirring blade. Therefore, the aeration device installed underwater simultaneously performs stirring and aeration in the drainage tank, as well as crushing floating scum.

Next, a second embodiment using the manhole hanging type aeration device shown in FIG. 2 will be described. In the figure, 15 is a manhole, and the motor 11 is installed on this manhole 15.
An aeration device 9 is installed vertically at the bottom. This aeration device 9 has a hollow shaft 1 inside a casing 10 attached to the lower part of the manhole.
6 and connects the motor 11 to the upper end of the hollow shaft 16 so as to be driven by the motor 11, and a stirring blade 12 is provided at the lower end of the hollow shaft 16. This stirring blade 12 is always immersed in the drainage water in the tank and is rotated via a hollow shaft by the drive of a motor, so that a downward water flow is generated around the stirring blade.

Further, at the lower end of the casing 10, a draft tube 13 is provided which has a diameter larger than the diameter of the lower end of the casing and has an inner diameter that allows a stirring blade to be sufficiently inserted therein, and the lower part of the draft tube 13 is curved as necessary. .

In the aeration device 119 configured as described above, the motor 1
When the stirring blade 1 is driven, the stirring blade 12 rotates via the hollow shaft 16, and a downward water flow is generated around the stirring blade 12. This water flow generates a negative pressure section at the lower end of the hollow shaft 16. For this reason, the intake hole 16 opened at the top of the hollow shaft.
The gas sucked from H passes through the hollow inside the hollow shaft 52, reaches the opening 16T at the lower tip, is mixed into the water stream, and flows downward as a water stream mixed with air bubbles. The water stream mixed with air bubbles is then changed into a horizontal flow by an L-shaped or dogleg-shaped draft tube 13, and is forcefully discharged in a predetermined direction within the tank 1, as shown by the arrow inside the dandelion 1. It will create a flow.

In this embodiment, FIGS. 1 and 2, the aeration device 3 or 9
The installation method is done using a manhole, and in both cases,
In order to efficiently mix and stir the inside of the tank, the discharge port of the draft tube is oriented in the longitudinal direction of the cypress as shown in FIG. Furthermore, there is a pump 17 in the tank for discharging wastewater, and since aeration towards the pump will cause cavitation due to air bubbles during pump operation, as shown in Figure 3, the draft tube discharge port is approximately opposite to the pump. Turn to the side.

Further, although it is desirable to perform continuous operation, the desired effect can also be achieved when intermittent operation is performed in conjunction with a timer or level meter. That is, when using a timer, the downtime should be less than 24 hours because anaerobic rot will occur if the downtime is longer than 24 hours. In addition, when using a level meter, as shown in Figure 4, the LWL is above the upper end of the draft tube, and HWL is the upper end of the draft tube + 500, which is considered to be the limit of scum suction.
Operate in conjunction with the drainage pump to keep it within +m. However, if wastewater is discharged by a pump more than once a day, HWL is the upper end of the draft tube + 1.500.
Even if the thickness is within mm, the desired effect can be achieved.

Next, the test results of the method for preventing rot and malodor generation in a building drainage tank according to the present invention will be explained.

(A) Exam content odor measurement Four malodorous substances (H, S, MM, DMS).

DMDS).

(B) Test results Of the building drainage tanks, the odor data measured in the gray water tank is shown in Fig. 5, and the odor data measured in the sewage tank is shown in Fig. 6.

By using an aeration device, both the odor in the drainage tank and the odor in public spaces has been significantly reduced, and the al
It has a liF effect. Taking hydrogen sulfide (H□S) as an example, in the case of a gray water tank, by adopting the floor method, the odor inside the tank is reduced to 1/[ioo], and the odor in a public tank is reduced to 1/40.
It became 00.

〔Effect of the invention〕

In the present invention, the method for preventing spoilage and malodor generation in building drainage tanks, etc., involves installing an aeration and agitation device in the nuclide to agitate the wastewater introduced into the tank, so that the sludge, etc. contained in the wastewater is kept at the bottom of the tank. It can be pumped out without deposits. In addition, aeration prevents anaerobic putrefaction, and floating scum on the water surface can be suctioned and crushed and pumped out of the tank along with drainage, so rot and bad odors can be prevented in the tank.

Furthermore, since there is no need to take out scum and accumulated sludge when cleaning the inside of the tank, there are advantages such as reducing the number of times of cleaning, reducing cleaning costs, and preventing the occurrence of flies.

[Brief explanation of the drawing]

The drawings show an embodiment for embodying the method for preventing rotting and malodor generation in a building drainage tank according to the present invention, and Fig. 1 is a sectional view of the first embodiment showing an installation type in a tank, and Fig. 2 is a sectional view of the first embodiment showing a method for installing in a tank. A sectional view of the second embodiment showing the following formula, Fig. 3 is a plan view showing the mounting position, Fig. 4 is a sectional view showing the operating method, Fig. 5 is an odor data table for gray water tank, and Fig. 6 is the odor data table for the sewage tank. 1 is a drainage tank, 2 is a tank bottom, 3 is an aeration device, 4 is a submersible motor, 5 is a stirring blade, 6 is a draft tube, 7 is an air blowing pipe, 8 is a scum, 9 is an aeration device, IO is a casing, 1
1 is a motor, 12 is a stirring blade, 13 is a draft tube, 14 is a scum, 15 is a manhole, 16 is a hollow shaft, 1
7 is the drainage pump Fig. 3 Fig. 4

Claims (1)

[Claims] Equipped with an aeration stirring device in a building drainage tank, etc., it supplies air to the wastewater in the tank while stirring it, and also absorbs and crushes floating scum.
A method for preventing decay and foul odor generation in building drainage tanks, etc., characterized by preventing sludge accumulation and scum generation in wastewater and anaerobic putrefaction of wastewater.