JPS6268589A - Aeration apparatus for preventing spoilage of building drain tank - Google Patents

Abstract

PURPOSE:To always perform the blow-in of air according to a set schedule, by suspending a self-suction type aeration apparatus with a float in a building drain tank and providing a draft tube to the lower part of the aeration tank. CONSTITUTION:An aeration apparatus 4 consists of a float 5, the drive apparatus 6 provided on said float 5, a stirring blade 7 and a draft tube 8. The float 5 is provided so that the stirring blade 7 is always positioned at a required depth from a liquid surface and the drive apparatus 6 is always positioned above the liquid surface and revolves the drive shaft piercing through a hollow shaft 9 from the drive apparatus 6 to revolve the stirring blade 7. A bracket 10 is vertically provided from the float 5 and the upper part of the draft tube 8 is engaged with the bracket 10 to vertically suspend the draft tube 8. The stirring blade 7 is driven to generate negative pressure in the liquid to suck air is from a suction port 11 by utilizing negative pressure. By this method, anaerobic fermentation can be prevented.

Description

DETAILED DESCRIPTION OF THE INVENTION FIELD OF INDUSTRIAL APPLICATION The present invention relates to an aeration device for preventing spoilage of building drainage tanks.

Conventional technology and its problems In buildings and other structures that have living or commercial spaces underground, gray water generated within the building is generally drained naturally to a drainage tank installed at the deepest part of the building. It is collected by flowing water and drained into the public sewer system using a drainage pump. This is because the building drainage tank is installed at a lower position than the public sewer system.Of course, if the wastewater inside the building can be directly discharged to the public sewer system, there is no need to provide a building water tank or a storage tank.

Thrust wastewater generated within the building flows into such a building drainage tank, and organic matter flows in with the accumulated wastewater. When this is stored in the tank, it often rots anaerobically and produces a foul odor. be. For this reason, attempts have been made to install a blower to forcibly exhaust the malodorous components generated from the drainage tank into the atmosphere, 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 causes the odor to be discharged by the proa. Its function was hindered and it was unable to produce sufficient effects.

The present invention aims to prevent anaerobic decay of organic matter by constantly blowing air into the tank for aeration even if the liquid level in the tank fluctuates.

Solution to the problem: A self-priming aeration system with a float is suspended in the building's drainage tank.
By installing a draft tube at the bottom of this aeration device, air is always blown in according to the settings even when the liquid level changes in the tank, and it also prevents anaerobic fermentation of organic matter and prevents the occurrence of bad odors. Do what you want.

Example The present invention will be explained below based on embodiments shown in the drawings.

In the figure, 1 is a building drainage tank (sometimes also serving as a storage tank) installed on the lowest floor of an underground building. A cable 3 such as a wire lobe is connected to the slab 2 of this drainage tank 1 for an aeration system. 4 is supported 8 times. This aeration device 4 includes a float 5,
A drive device 6 such as a motor installed on this float,
It consists of a stirring blade 7 driven by this drive device, and a draft tube 8 that covers the outer periphery of the stirring blade and guides the stirring flow to reach the bottom of the tank. 7O-)5
The aeration device 4 is installed so that the stirring blade 7 is always at a required depth below the liquid level even if the liquid level in the tank changes.
However, the drive device 6 is always kept above the liquid level, and the drive device 6 rotates a drive shaft (not shown) that passes through the hollow shaft 9, and rotates the stirring blade provided at the lower end of this shaft. Let it happen. A draft tube 8 is arranged so as to cover the outer periphery of the stirring blade 7, but this is done by suspending a bracket 10 from the float 5, locking the upper part of the draft tube to this bracket, and suspending the draft tube 8. do. Both the upper and lower ends of this draft tube 8 are opened in the liquid, and the lower end portion extends to near the bottom of the tank, so that air can be blown into the waste water stored in the tank and the waste water can be stirred over the metal body in the tank. Curve it along the bottom of the tank.

In this aeration device 4, when a stirring blade is driven by a drive device, negative pressure is generated in the liquid at the tip of the stirring blade. Utilizing this negative pressure, air is sucked in through the intake hole 11 opened at least above the liquid level of the hollow shaft, flows down inside the hollow shaft, and then released into the liquid from the opening at the lower end of the hollow shaft. The liquid is further finely stirred by a stirring blade, and air is naturally blown into the liquid. The aeration device 4 has its own weight supported by the buoyancy of the float 5, and the cables 3 are used when suspending the aeration device 4 with the float into the tank, or when hoisting it up in the event of a breakdown or inspection. It is something.

Further, a reaction force is generated by driving the aeration device 4.

If the aeration device is only supported by 70 feet, this reaction force will cause the aeration device to move within the tank. In order to prevent this, a rod or stage is hung from the slab or other fixed side, or a rod is established from the bottom of the tank, and a float or a part of the aeration device is locked to this rod 12, so that the aeration device can be activated by the reaction force. Make sure that it does not move within the tank.

Also, instead of the rod or stay, an aeration device may be anchored to the bottom of the tank.

Next, a comparison of the results when the aeration device of the present invention was used and when the aeration device was left unused was as follows.〇〇Test content l Odor measurement: 4 foul odor substances (lizs, MM, DMS, DMDS)
) was measured.

2 Water treatment performance (1) Generous EOD, COD, 38. T-N, PO4-P(
2) After aeration BOD, COD, SS, 'l'-N, PO(-
P3 Noise/Vibration Noise/vibration caused by the aeration device was measured.

B. Test results (1) The results of odor measurement are shown in Figure 2.

By using an aeration device, hydrogen sulfide (H2S) can be reduced to 1
15, methyl mercaptan (MM) to 1/2000, methyl sulfide (DMS) to 1/4, methyl disulfide (DM
DS) decreased to 1/1.8.

Normally, the value would have been close to the value before the cleaning on September 13th, and a significant aeration effect was observed.

(2) The results of water quality measurements are shown in Figure 3.

There was almost no change in water quality even after aeration. (3) Noise was 69 to 74 dB (A), which was almost no problem.

(4) The vibration was 5 to 10 μm, causing almost no problem.

In addition to the above-described embodiments, the present invention may not require a draft tube (guide tube) depending on the shape of the tank.

Effects of the Invention According to the present invention, since a self-priming aeration device is provided in the building drainage tank, anaerobic fermentation of organic substances flowing in can be prevented, thereby suppressing the occurrence of bad odors, and improving the aeration device. Since the entire structure is supported by 70-points, it can be easily installed even in a deep drainage tank, and has the advantage that desired aeration can always be achieved even if the liquid level in the tank fluctuates.

[Brief explanation of drawings]

FIG. 1 is a cross-sectional explanatory diagram of the aeration device of the present invention, FIG. 2 is a graph of odor measurement, and FIG. 3 is a graph of water quality measurement. 1 is a drainage tank, 2 is a sufupu, 3 is a cable, 4 is a #S air device,
5 is a float, 6 is a drive device, 7 is a stirring blade, 8 is a draft tube, 9 is a hollow shaft, 10 is a placket, 11 is an intake hole, and 12 is a rond. Figure 1

Claims (1)

[Claims] A float suspended from a cable inside the building drainage tank is equipped with a drive device, stirring blades, and a draft tube to agitate the drainage water in the tank and blow air into it, and the float automatically responds to changes in the liquid level. An aeration device for preventing rot in building drainage tanks that moves the aeration device up and down.