JPH0677755B2 - Aeration device for dispersing oils and fats in wastewater treatment tanks - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a device for dispersing and purifying fats and oils in a wastewater treatment tank for decomposing and purifying fats and oils.

[0002]

2. Description of the Related Art In a wastewater treatment facility consisting of ordinary aeration equipment containing high concentrations of fats and oils, fats and oils are not dissolved in water, fats and oils have a lower specific gravity than water, and fats and oils are membranes due to their surface tension. Or, for reasons of the properties of fats and oils such as forming lumps, the fats and oils are floated and separated and discarded as oil mud,
Treated water excluding oils and fats is decomposed and purified by microorganisms.

As equipment for compensating for the above-mentioned drawbacks, there are equipment for agitating the inside of a tank by using power of a motor or the like, and equipment for sucking floating oils and fats by a circulation pump to disperse them in water.

[0004]

In a normal aeration device,
Microbial treatment of wastewater containing fats and oils was difficult due to the nature of fats and oils. In addition, in the case of improving the efficiency of microbial treatment of fats and oils by dispersing fats and oils in water by using other powers such as a conventional motor and circulation pump, an aeration device is also required, resulting in high equipment cost and operating cost. There was a drawback that became.

[0005]

DISCLOSURE OF THE INVENTION The present invention is intended to solve the above-mentioned problems, and a pipe passage having an inlet opening at a position slightly lower than the surface of the processing liquid is sequentially lowered from the inlet opening. Then, the pipe body is bent so as to be inclined upward toward the outlet opening located in the treatment liquid in the dispersion tank, and air is blown to the relatively low position at the upward inclined portion of the pipe passage. It is characterized in that it is composed of an air blowing pipe means for removing.

[0006]

When the air is blown from the air blowing pipe means, the floating oil and fats in the processing tank are sucked from the inlet opening of the pipe passage by the action of the air, and the sucked oils and fats are blown. By the bubbling action of the air, the mixture is vigorously stirred and mixed into fine particles, and the fine particles are discharged from the outlet opening. In addition, the treatment liquid flowing out together with air from the outlet opening causes a water flow in the treatment liquid in the treatment liquid tank to efficiently disperse the finely divided oils and fats, and to sufficiently aerate the treatment liquid. Become. The finely divided oils and fats are efficiently decomposed and purified by microorganisms.

[0007]

FIG. 1 is a sectional view of a wastewater treatment tank according to the present invention. Reference numeral 2 denotes an oil / fat dispersion / aeration device provided in the processing tank 1, which is specifically as follows. 2a is a pipe body in which the passage p is sequentially lowered from the inlet opening P1 and is subsequently bent so as to be inclined upward toward the outlet opening P2, and 2b is a rising slope portion in the passage p of the pipe body 2a for comparison. It is an air blowing pipe means for blowing air to an extremely low position. Entrance opening P
No. 1 is opened at a position slightly lower than the surface of the treatment liquid w so that the oil and fat liquid floating in the treatment tank can flow in together with the treatment liquid w, and the outlet opening P2 is opened in the treatment tank. Let The rising inclination of the pipe body 2a may be vertical, but is appropriately set depending on the size of the tank, the water depth, the pipe diameter, the amount of blown air, the specific gravity of the treatment liquid w to be sucked, and the like. Exit opening P2
2 is preferably provided with a dispersion box 3 which surrounds the ceiling and the upper side of the box, as shown in FIG. The dispersion box 3 is, for example, a box body composed of a top plate 3a and side walls 3b, and is provided with a large number of relatively small through holes 3c at a position lower than a certain height of the side walls.

Reference numeral 4 is an air diffuser provided in the processing tank, and its material and shape are not particularly limited as long as it can uniformly generate bubbles. Reference numeral 7 is a blower for sending air, 5 is an air pipe, and 6 is a valve for balancing the air.

An example of use of the above wastewater treatment tank and its operation will be described. Operate the blower 7 during use. As a result, the oil / fat dispersion / aeration device 2 allows the treatment liquid w to pass through the inlet opening P1.
From the outlet opening P2,
Further, the air diffusing means 4 serves to generate a large number of bubbles in the treatment liquid w.

Then, the oils and fats contained in the treatment liquid w reach the inlet opening P1 of the oil and fats dispersion and aeration device 2, are sucked into the passage p of the pipe 2a from here, and reach the rising inclined portion thereof. At this time, due to the bubbling action of the air blown from the blowing pipe means 2b, it is vigorously mixed and stirred with water or air to be atomized and the treatment liquid is aerated. The oils and fats treated in this way float along with air and the like through the through holes 3c of the dispersion box 3. Here, active bubbling of air also occurs to promote the miniaturization and aeration treatment, and at this time, The treatment liquid w in the treatment tank 1 is agitated by the generated water flow, and the dispersion treatment of oils and fats and the aeration treatment in a wide range of the treatment liquid w are performed. The presence of the dispersion box 3 also has the effect of reducing the bubbling noise of the air as compared with the case where it is not present.

The aeration means 4 is installed in accordance with the size of the tank and the microbial load of the treated water, and serves to assist the aeration treatment into the treatment tank and the suction of floating oils and fats of the aeration device as well as the dispersion of oils and fats. Is. In the treated water w treated in this way, oils and fats are sufficiently finely divided, so that they are decomposed and purified by the force of the microorganisms living in the tank.

[0012]

As described above, according to the present invention, since the effective dispersion and aeration process by the oil and fat dispersion and aeration device is performed, the effective decomposition and purification process of the microorganisms in the treatment tank can be performed to further improve the purification. It is possible to obtain the action.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional explanatory view of a device of the present invention.

FIG. 2 is a perspective view of a dispersion box used in the device of the present invention.

[Explanation of symbols]

 1 treatment tank 2 oil and fat dispersion and aeration device 2a pipe body 2b air blowing pipe means 3 dispersion box 3a through hole 4 air diffuser means 5 air pipe 6 valve 7 blower p pipe passage P1 inlet opening P2 outlet opening

Claims (1)

[Claims] 1. A pipe passage having an inlet opening at a position slightly lower than the surface of the processing liquid is sequentially lowered from the inlet opening, and then toward an outlet opening located in the processing liquid in the dispersion tank. Oils and fats of a wastewater treatment tank containing oils and fats, which are composed of a pipe body bent so as to have an ascending slope and an air blowing pipe means for injecting air to a relatively low position at the rising slope portion of the pipe passage. Dispersion and aeration device.