JPS63182098A - Method for preventing generation of spoilage and malodor in drain tank for building - Google Patents

Abstract

PURPOSE:To prevent the generation of suspended scum, by a method wherein the drain water in a tank is stirred under the supply of air and the suspended scum is sucked and ground in an aeration apparatus while the water level in the tank is controlled by the operation of a pump. CONSTITUTION:When a submerged pump 4 is driven, a stirring blade 5 is revolved and the drain water in a tank is stirred to generate negative pressure in the water at the leading end part of the blade 5. Air is blown in the drain water from the atmosphere from an air blow pipe 11 by said negative pressure and mixed with the stirred stream of the drain water in a draft tube to be pushed out in the forward direction of the draft tube. The air blow port the air blow pipe is inserted in the stirring blade and a large amount of air is blown in the drain water by utilizing the negative pressure in the max. degree to allow scum 8 to flow in the draft tube and said scum 8 is ground by the stirring blade. By this method, cleaning cost can be reduced.

Description

[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a method for preventing wastewater from rotting and producing bad odors in various building drainage tanks, pumping wells at pump stations, and other building drainage tanks. be.

[Conventional technology and its problems]

Buildings constructed in recent years generally have many living or commercial spaces underground, and these living or commercial spaces generate a lot 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 will be provided in which the wastewater will be drained by gravity and then discharged 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 moderate the amount of water.

These drainage tanks and pump wells for buildings have not traditionally been required to function as temporary storage ponds, so they are simply water tanks with a length of 1 m. Because the tank was designed to store wastewater without struggling, and because the inflow and discharge were irregular, the wastewater in the tank often rotted anaerobically and emitted strange odors. 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 obstructs the blower's discharge function. Not being able to achieve sufficient effect.

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 remove all the wastewater from the tank, and the sludge that accumulates at the bottom of the tank and the scum on the water surface cannot be pumped out, and this sludge and scum cause rot and odor. Furthermore, because almost no water flows in at night, the pump stops operating for a long time.
Corruption had progressed further.

The present invention controls the water level of the wastewater in the tank, sucks and crushes the scum floating on the water surface during stirring and aeration, and discharges the floating scum along with the wastewater, thereby preventing the occurrence of rot and bad odors in the tank. The purpose is to prevent

[Means for solving problems]

This aeration device is equipped with an aeration agitation device and a pump in a pill drainage tank, etc., and agitates the wastewater in the tank while supplying air, and controls the water level in the tank by operating the pump. [Example] Next, the present invention is absorbed and crushed in the tank and discharged together with the wastewater of 7J7 water, thereby preventing the accumulation of sludge and the generation of floating scum in the tank and preventing anaerobic putrefaction of the wastewater. Description will be made based on the embodiment shown in FIGS. 1 and 2.

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 intake pipe (11). The submersible motor 4 is fixed to the bottom of the tank, and the upper end 6a is attached to the submersible motor 4.
The lower part 6b is integrally provided with a draft tube 6 bent in an L-shape along the bottom of the tank, and a stirring blade 5 driven by the motor is provided within this draft tube. An air intake pipe 11 is provided in the draft tube 6 so that the air inlet 11a is positioned 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 11 is a vibrator 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. As a result, a negative pressure is generated in lα at the tip of the blade. With this negative pressure, air is blown into the liquid from the atmosphere through the air blowing pipe 11, mixed with the stirring flow of waste water in the draft tube, and pushed out toward the front of the draft tube.

The air inlet 11a of this air intake 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 waste water. Since it is separated from the stirring blade, it is possible to prevent interference with the stirring blade. Also, it does not obstruct water flow.

Further, the floating scum 8 provided at both ends of the air outlet 11a to prevent upward flow is swept into the draft tube together with the waste water flowing into the draft tube by the driving of the stirring blade. Shattered. Therefore, an aeration device installed in the water is used to stir and aerate the inside of the drainage tank.
! ! Idle scum crushing is also carried out at the same time.

Further, when the scum 7 floating on the water surface is efficiently sucked into the draft tube 6 and aerated into the waste water by the stirring blade, it is crushed together. This is done by adjusting the water level in tank 1.

The water level is adjusted by installing a pump 9 in the tank 1, detecting the water level with a level switch 1o, and driving the pump 9.

This pump 9 is placed on the tank bottom 2, and a drain pipe 8 is connected to the outside of the tank.

If the distance from the upper end of the suction port of the draft tube 6 to the water surface is adjusted to 100 to 200 m, scum floating on the water surface can be sucked in most efficiently. Therefore, when the pump 9 is operated ON-OFF with the level switch IO, the water level WL is always kept between the ground level HLW and the lower water level LWL.

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 4 bad smells! () (as, MM, DMS.

(B) Test results Of the building drainage tanks, the odor data measured in the gray water tank is shown in Figure 3, and the odor data measured in the sewage tank is shown in Figure 4.

By using an aeration device, the odor inside the drainage tank and the odor in public spaces has been significantly reduced, demonstrating the remarkable effects of this method. Taking hydrogen sulfide (HgS) as an example, in the case of gray water tanks, the odor inside the tank has been reduced to 1/600, and the odor in public spaces has been reduced to 1/4000.

〔Effect of the invention〕

In the method of preventing rot and odor generation in building drainage tanks, etc. of the present invention, an aeration device and a pump are installed in the nuclide, and the water level is raised to 11! The scum floating on the water surface can be sucked into the aeration device, crushed, and pumped out of the tank along with drainage, thereby preventing rot and bad odors inside the tank.

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

[Brief explanation of the drawing]

The drawings show an embodiment for embodying the method for preventing spoilage and malodor generation in a building drainage tank, etc., according to the present invention. FIG. 1 is a sectional view of an aeration device, FIG. Figure 3 is an odor data table for a gray water tank, and Figure 4 is an odor data table for a 1η aquarium. 1 is a gray water 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 a scum, 8 is a drain pipe, 9 is a pump, IO is a level switch, 1
1 is the air suction pipe, vJ1 diagram. b Fig. 2 Fig. 3 (unit ppl) Fig. 4 (unit ppm)

Claims (1)

[Claims] A drainage tank for a building is equipped with an aeration agitation device and a pump, and air is supplied to and agitated the wastewater in the tank, and the water level in the tank is controlled by operating the pump to absorb and crush floating scum into the aeration device. A gray water tank for a building, etc., characterized in that it is discharged outside the tank along with the wastewater, thereby preventing the accumulation of sludge and the generation of floating scum within the tank, and preventing anaerobic putrefaction of the gray water. Method for preventing rot and odor generation.