JPS61120697A - Method for preventing spoilage and performing deodorizing in drain tank or storage tank for building - Google Patents

Abstract

PURPOSE:To prevent anaerobic spoilage, by facilitating the exhaustion of the malodor in a various waste water tank to an exhaust duct by using a self- suction type aeration apparatus and aerating various waste waters in the various waste water tank under stirring. CONSTITUTION:When a prime mover 51 is driven, a stirring blade (water stream generation device) 53 is rotated and a downwardly directed water stream is generated around the stirring blade 53. A negative pressure part is generated at the lower end of a stirring shaft 52 by the water stream. The gas sucked from a suction port 56 passes through the hollow bore 57 in the stirring shaft 52 to reach the opening of the lower leading end 58 of said shaft 52 and mixed in the water stream while the water stream mixed with air bubbles flows downwardly and converted to a stream in a horizontal direction by an L-shaped or V-shaped guide tube 55 to be forcibly emitted to a predetermined direction in a treatment tank 1.

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial Field of Application] The present invention relates to a method for preventing spoilage and a method for deodorizing gray water tanks for buildings.

[Prior art 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 gray water.

However, if the source of this gray water is lower than the drainage facility of the public sewerage system, natural discharge cannot be carried out, and for this reason, the lowest floor of such a building has no water discharge inside the building (particularly underground). A gray water tank for buildings is installed, which collects gray water by gravity and discharges it to the public sewerage facility using a drainage pump.

Furthermore, even if the water is drained from the ground floor, if it is discharged all at once to the public sewer system, it may exceed its capacity, and a storage tank is arranged to buffer such instantaneous amount of water.

Conventionally, this gray water tank for buildings has not been required to have any function other than temporary storage. For this reason, it is simply equipped with a water tank. Nevertheless, because gray water is stored in the tank, and the water and drainage are irregular, the gray water in the gray water tank often undergoes anaerobic decomposition and gives off a strange odor.

For this reason, attempts have been made to remove the odor in the gray water tank by discharging the proa, but as a result of fluctuations in liquid level due to the amount of inflow and discharge water, the piston effect of the liquid level inhibits the evacuation function of the pura. However, it has not been possible to increase the sufficient effect 2.

The present invention has been made with the object of fundamentally solving the problems faced by the gray water tanks for buildings described above.

[Means for solving problems]

In order to achieve the above object, the present invention equips a building gray water tank with a self-priming aeration system, and uses this self-priming aeration system to forcibly supply fresh air into the tank. Stirring prevents anaerobic putrefaction of gray water.

〔Example〕

Hereinafter, embodiments of the present invention will be described based on the drawings. Fig. 2 shows the shape of a building pit suitable for applying the aeration device of the present invention. Generally, N1 is often narrow due to restrictions from the installation location, such as the example shown in FIG.

FIG. 3 shows an example in which the aeration device of the present invention is applied to a manhole 2 of Bilbit.

In the figure, a mounting frame 4 is suspended from a manhole 2 provided in a floor 3 forming the upper surface of the building bit.

The mounting frame 4 consists of a plurality of units) 41, 42, and 43, and the units 4 are arranged according to the depth of the building bit processing tank 1.
By adjusting the number of units 2, the installation height of the aeration device 5 to be attached to the mounting frame is adjusted.

In addition, airtightness is ensured between the floor 3 and the mounting frame 4, and between the mounting frame 4 and the aeration device casing 6, in order to prevent the odor from inside the treatment tank 1 from coming out. The @air device 5, casing 6, water treatment tank 1, and water level detector 7 according to the present invention are attached to the mounting frame 4. The water level detector 7 is for detecting the fluctuating treated water level and operating the aeration device 5 effectively. The casing 6 has a predetermined length such that its lower end is in the treated water even at the lowest limit of the operable range. Further, an intake cylinder 8 for intake air is provided on the side surface of the casing 6, passing through the mounting frame 4.

Details of the aeration device 5 according to the present invention are shown in FIG.

In the figure, stirring blades & are attached to a hollow stirring shaft 52 connected to a prime mover 51 such as a motor.

As described above, the casing 6 is attached to the installation seat (mounting frame 4) of the prime mover 51.A circumferential guide tube gap is provided at the tip of the casing 6 via a mounting bracket. It is provided so as to cover the outer periphery of the stirring blade &, which is the water flow generating part.

Here, when the prime mover 51 is driven, the stirring blade rotates, and a downward water flow is generated around the stirring R53. This water flow generates a negative pressure section at the lower end of the stirring shaft 52. Therefore, the gas sucked from the suction hole passes through the hollow hole 57 in the stirring shaft 52 and reaches the opening in the lower tip, where it is mixed into the water stream and becomes a water stream mixed with air bubbles that flows downward. flows to Then, the water flow mixed with air bubbles is changed into a horizontal flow by an L-shaped or dogleg-shaped guide pipe, and is vigorously discharged in a predetermined direction inside the processing tank 1. This will create the flow shown below.

Regarding the above, a comparison of the results when using a self-priming aeration device and when leaving it alone without using it is as follows.

Human, test content 1 Odor measurement 4 foul odor substances (H2S, MM, DMS, DMDS)
K was measured.

2 Water treatment performance (1) @ generous BOD, COD, 3S, T-N, po4-P (
2) After aeration BOD, COD, 8S, TN, PO4-P3
Noise and VibrationThe noise and vibration caused by the Subaru rotor was measured.

B. Test results (1) The results of odor measurement are shown in Figure 4.

By using a Svar rotor, hydrogen sulfide (H2S) and methyl mercaptan (MM) were reduced to 0. Methyl sulfide (DMS) was reduced to 0 and methyl disulfide (DMDS) was reduced to 0.

Normally, the value should be close to the value before mouth cleaning, and a significant aeration effect was observed.

(2) The results of water quality measurements are shown in Figure 5.

There was almost no change in water quality even after aeration.

(3) Noise was 69 to 74 dEcA), which was almost no problem.

(4) Vibration was 5 to 10μ intestine, causing almost no problem.

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

Furthermore, if the self-priming aeration device is supported on the liquid surface by a float, it becomes possible to install the self-priming aeration device without using a manhole.

〔Effect of the invention〕

According to the present invention as described above, the side effect of completely removing the odor in the building bit and improving the quality of the discharged water is produced.

[Brief explanation of drawings]

FIG. 1 is a diagram showing an aeration device according to an embodiment of the present invention, FIG. 2 is a plan view of a building bit to which the device shown in FIG. 1 is applied, and FIG. FIGS. 4 and 5 are diagrams showing the performance of one embodiment of the present invention. 5... Aeration device, 6... Casing, 51... Prime mover, 52... Hollow shaft, group... Water flow generator, 5...
...Guide tube. Figure 1

Claims (1)

[Claims] (1) A method for preventing rot in a building gray water tank or a storage tank that is placed underground in a building and guides the gray water discharged from inside the building by gravity, and then drains it using a drainage pump. A self-priming aeration device is installed in the tank, and this aeration device supplies air to the wastewater in the tank and agitates the wastewater in the tank.On the other hand, the gas in the tank is removed from the exhaust pipe installed at the top of the tank. A method for preventing rot and deodorizing a tank, characterized by discharging the air through an exhaust duct or to the outside.