JP3678126B2 - Foaming liquid processing apparatus and processing method - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a foaming liquid processing apparatus and processing method. More specifically, the present invention does not require a large-scale device, and without using an antifoaming agent or the like, the foaming having an excellent feature that the generation of foam from the foamable liquid can be efficiently suppressed. The present invention relates to a treatment apparatus and a treatment method for a chemical liquid.
[0002]
[Prior art]
It may be necessary to suppress the generation of bubbles from the foamable liquid. For example, in wastewater treatment using activated sludge, bubbles are generated in the aeration tank, and the generation of the bubbles causes a problem that the wastewater treatment capacity of the aeration tank is reduced. As a method for solving such a problem, a technique using an antifoaming agent is known. However, this method involves the cost of the defoamer and the problem of generating BOD (biochemical oxygen demand) derived from the defoamer.
[0003]
[Problems to be solved by the invention]
In such a situation, the problem to be solved by the present invention is that a large-scale apparatus is not required, and generation of bubbles from the foamable liquid can be efficiently suppressed without using an antifoaming agent or the like. The object is to provide an apparatus and a method for treating a foamable liquid having excellent characteristics.
[0004]
[Means for Solving the Problems]
That is, one of the present inventions is a foaming liquid processing apparatus having the following means (A) and (B ), wherein the tray is below the liquid level (in the liquid) below the means (A). And a suction pump as a means for removing the liquid generated from the broken foam out of the system, and receiving the wastewater treatment by activated sludge having the following means (A) and (B) arranged above the receiving pan: The present invention relates to an apparatus for treating foamable liquid in an aeration tank .
(A): means for destroying bubbles by spraying a liquid on the upper part of the bubbles (B): means for removing liquid generated from the destroyed bubbles out of the system. Treatment of foamable liquid in an aeration tank for wastewater treatment with activated sludge that destroys the foam by spraying the liquid on the top of the foam and removes the liquid generated from the destroyed foam out of the system using the above treatment device It concerns the method.
[0005]
DETAILED DESCRIPTION OF THE INVENTION
The processing apparatus of the present invention has (A) means for destroying bubbles by spraying a liquid on the top of the bubbles. In short, this means is sufficient if the liquid can be sprayed on the top of the foam, and a normal spray nozzle can be used. In the present invention, the sprayed liquid is made to collide with the bubbles to destroy the bubbles, and it is preferable to spray with a certain amount of momentum. The liquid to be sprayed may be the same liquid to be treated as the liquid forming the foam, or may be unused water or the like. Spraying does not necessarily have to be performed on the entire surface of the foam, and in the case of the present invention which flows like an aeration tank for wastewater treatment with activated sludge, it may be performed at one or a plurality of locations in the flow path. Further, it is not always necessary to completely destroy the bubbles, and the degree of destruction may be adjusted according to the situation.
[0006]
The processing apparatus of the present invention has (B) means for removing the liquid generated from the broken bubbles out of the system. The broken liquid drifts near the upper surface of the liquid to be treated for a while. This drifting liquid is removed from the system. For this purpose, a suction pump is used. In addition, in order to prevent the drifting liquid from descending, a saucer is installed at an appropriate position (in the liquid) below the liquid surface of the sprayed portion .
[0007]
The present invention destroys bubbles and selectively removes the liquid forming the bubbles out of the system. Usually, a component that promotes foaming is contained in the foam, and foaming can be efficiently suppressed by removing the component out of the system.
[0008]
The treatment apparatus of the present invention is a foaming liquid treatment apparatus having the means (A) and (B). The foaming liquid is applied to an aeration tank for wastewater treatment using activated sludge.
[0009]
Using the treatment apparatus of the present invention, a foaming liquid treatment method can be performed in which the liquid is sprayed on the top of the foam to break the foam and the liquid generated from the broken foam is removed from the system.
[0010]
【Example】
Example 1
This invention was implemented by the aeration tank (1) of the wastewater treatment by activated sludge (refer FIG. 1). Spray nozzles (2) (6 pipes with a diameter of 6 mm are attached to the lower part of a ring-shaped pipe with a diameter of 500 mm and a spray groove with a length of 10 mm and a width of 2 mm at the tip) are provided at two locations in the aeration tank, Water (3) was sprayed. The spray pressure of spray water was 100 kPaG, and the flow rate was 800 kg / hr for each spray nozzle. The distance between the spray nozzle and the foam (4) was about 300 mm. The liquid generated from the destroyed foam was removed out of the system by the pump (5) (6). The flow rate of the liquid was 8000 kg / hr. As a result, the thickness of the foam layer in the aeration tank could be controlled to 4 cm or less.
[0011]
Comparative Example 1
In Example 1, although it sprayed, it implemented without removing the liquid which arose from the foam destroyed by spraying out of the system. As a result, the thickness of the foam layer in the aeration tank was 7 cm at the maximum, and the surface area of the foam occupying the water surface of the aeration tank was not changed as compared with Example 1.
[0012]
Comparative Example 2
In Example 1, it was carried out without spraying and without removing the foam liquid out of the system. As a result, the thickness of the foam layer in the aeration tank was a maximum of 7 cm, and the surface area of the foam on the aeration tank water surface increased by 66% compared to Example 1.
[0013]
【The invention's effect】
As described above, according to the present invention, there is an excellent feature that the generation of foam from the foamable liquid can be efficiently suppressed without using a large-scale apparatus and without using an antifoaming agent or the like. A processing apparatus and a processing method for a foamable liquid could be provided.
[Brief description of the drawings]
FIG. 1 is a schematic cross-sectional explanatory view of a processing apparatus used in Example 1. FIG.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 Aeration tank of wastewater treatment by activated sludge 2 Spray nozzle 3 Spray water 4 Foam 5 Pump 6 Removed liquid 7 Sauce pan 8 Aeration air diffuser tube 9 Aeration air
10 Bubbles from aeration air

Claims (2)

A foaming liquid processing apparatus having the following means (A) and (B ), wherein a receiving tray is placed below the liquid surface (in the liquid) below the means (A), and is generated from a broken foam. A device for treating foamable liquid in an aeration tank for wastewater treatment using activated sludge having the following means (A) and (B), which is disposed above the receiving tray as a means for removing the liquid outside the system.
(A): Means for destroying bubbles by spraying liquid on the top of the foam (B): Means for removing liquid generated from the destroyed bubbles out of the system The foaming property in the aeration tank of the wastewater treatment by the activated sludge that destroys the foam by spraying the liquid on the upper part of the foam and removes the liquid generated from the destroyed foam to the outside of the system . Liquid processing method.

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