JPH08132019A - Foam separator - Google Patents

Abstract

(57) [Abstract] [Purpose] Concentrate polluted foam generated from the aeration tank provided for the fish and shellfish breeding device with a simple device as much as possible and discharge it to the outside to control the discharge amount, Separating fine foam. [Structure] Contaminated foam generated in the aeration tank a is connected above the aeration tank a and is collected by a cap-shaped foam collector 2 and is connected to the top of the foam collector 2 and positioned above the foam collector 2. A drainage pipe 3 having an upwardly convex U-shaped portion 5 guides polluted foam to the outside, and the U-shaped portion 3 of the discharge pipe 3 is adjusted to a discharge pipe height fine adjustment device 6
Lift up and down.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a foam separating apparatus for separating foam containing organic matter by a flotation effect of air bubbles.

[0002]

2. Description of the Related Art As one of fish and shellfish breeding equipment, foam separation that discharges organic substances dissolved in water to the outside of a tank (outside of an aeration tank) by a flotation effect of bubbles generated by an oxygen supply device such as a blower and a compressor. The system is widely used (see Japanese Utility Model Application Laid-Open No. 3-47087, Japanese Patent Application Laid-Open No. 3-229689, and Japanese Patent Application Laid-Open No. 3-272630). This method is excellent in that pollutants in water can be discharged out of the system without accumulating in the purification system.
By using this together with the conventional general filtration tank,
The pollution load on the filter medium in the filter tank can be reduced, and the nitrification of bacteria in the filter medium can be efficiently promoted. In particular, with the advent of a self-priming type aeration device (aerator) disclosed in Japanese Patent Application Laid-Open No. 59-160516 in recent years, a larger amount of fine bubbles than a conventional diffuser or ejector system using a blower or a compressor has been developed. It is now possible to feed and more rapid foam separation is feasible.

As shown in FIG. 6, the method for discharging the polluted foam from the aeration tank a is, for example, in the upper part of the aeration tank a around the axis of the aerator b attached to the aeration tank a. A cap-shaped bubble collector c is provided and pushed out by the air pressure of bubbles generated by the aerator b, or a laterally driven propeller d driven by a motor provided on the water surface of the aeration tank a as shown in FIG. 7 is used. As a result, polluted foam is sent to the outside. Further, the discharge speed of the foam is adjusted by raising and lowering the water level of the water surface of the aeration tank using the baffle plate e as illustrated in FIG. f is a filtration layer.

[0004]

However, in these methods, the foam discharge surface in the aeration tank is open, and the foam is immediately discharged from the aeration tank via a short path to an external open space, and the foam is discharged. There is a problem that the foam is not concentrated well because the vertical distance is not ensured in the discharge path through which the air flows. In addition, raising and lowering the water level for adjusting the discharge speed of the foam is delicate and difficult, and water is easily discharged together with the foam. For these reasons, a large amount of breeding water was often lost together with the foam, resulting in a hindrance to breeding. Therefore, the method of adjusting the foam, that is,
It is required to concentrate the foam and discharge it with a small amount of water. In view of the above circumstances, the present invention aims to control the discharge amount by concentrating polluted foam generated from an aeration tank provided for a fish and shellfish breeding device with a simple device as much as possible and discharging it to the outside. The purpose is to properly separate bubbles.

[0005]

SUMMARY OF THE INVENTION The present invention has been made in consideration of the above problems, and is a cap type foam collector connected above an aeration tank to collect polluted foam generated in the aeration tank, and the foam. A flexible discharge pipe that is connected to the top of the collector and has a U-shaped portion that is upwardly positioned above the foam collector and that guides polluted foam to the outside, and raises and lowers the U-shaped portion of the discharge pipe. A discharge separator height fine adjustment device is provided to provide a foam separation device, which is intended to solve the above-mentioned problems. Further, on the discharge side of the discharge pipe, the water level of the aeration tank is higher than the position. A polluted foam water storage tank is provided below, and the discharge pipe upper limit position of the discharge pipe in the polluted foam water storage tank is changeable. Furthermore, the discharge pipe in the polluted foam water storage tank is provided. In addition, a plurality of valves are provided at different positions in the height direction through open / close valves. Providing foam separator, characterized in that the outlet is connected, it is to solve the above problems.

[0006]

In the present invention, the aeration tank polluted foam is collected in the foam collector, and due to the exhaust pressure from below, the polluted foam advances from the top of the foam collector to the discharge pipe and reaches the U-shaped part of the discharge pipe. The water entering the discharge pipe together with the polluted foam or the water obtained by breaking the polluted foam in the middle returns to the aeration tank side so that the polluted foam is concentrated and the discharge pipe passes through the U-shaped portion. Will be discharged outward from the discharge part of. Then, by changing the position of the U-shaped portion vertically by the discharge pipe height fine adjustment device, the distance in the height direction from the water surface of the aeration tank to the U-shaped portion changes, and the degree of concentration of the polluted foam changes. . In addition, a polluted foam water storage tank is provided on the discharge side of the discharge pipe to receive the polluted foam from the drain pipe, and when the water is collected in the storage tank, the water level rises and the discharge port of the discharge pipe is covered. The discharge of the polluted foam from the aeration tank side is suppressed, and the discharge of the polluted foam is stopped.By changing the upper limit position of the outlet, the water level of the water storage tank that stops the feeding of the polluted foam is changed. . If a plurality of discharge ports are provided on the discharge side of the discharge pipe via an open / close valve, the water level of the water storage tank can be changed by selecting and opening / closing the open / close valve.

[0007]

EXAMPLES The present invention will be described in detail with reference to the examples shown in FIGS. In the figure, 1 is a foam separation device attached to the aeration tank a. The aeration tank a is provided with an aerator b, and fine bubbles generated by the aerator b pass through the tank and appear as contaminating foam on the water surface side, and the contaminant foam covers the upper opening g of the aeration tank a. The foam is collected by a cap-shaped foam collector 2 of the separation device 1. Since the foam collector 2 covers the upper opening g, the upper part of the aeration tank a is closed except for the discharge path from the foam collector 2. A discharge pipe 3 made of a flexible hose is connected to the top of the foam collector 2, and the polluted foam that has risen to the surface of the water while taking in organic substances in the water in the aeration tank a concentrates on the foam collector 2, and the pollution occurs. The foam receives the exhaust pressure from below by continuously sending out fine bubbles from the aerator b and is sent into the discharge pipe 3. In the foam separator 1, a polluted foam water storage tank 4 is disposed on the discharge side of the discharge pipe 3, and the polluted foam that has traveled in the discharge pipe 3 is received by the polluted foam water storage tank 4 and becomes polluted water. To store.

The discharge pipe 3 has a U-shaped part 5 projecting upward at a position above the top of the foam collector 2, and the U-shaped part 5 is supported by a discharge pipe height fine adjustment device 6. I have. As described above, the polluted foam is sent from the foam collector 2 to the discharge pipe 3, and water (breeding water) in the aeration tank is also sent together with the polluted foam. Therefore, since the discharge pipe 3 has the U-shaped portion 5, the water in the aeration tank or the water in which polluted foam is broken during the process from the foam collector 2 to the U-shaped portion 5 in the upper position is aerated. It is installed so as to return to the tank side, and the polluted foam will be concentrated. When a large amount of water in the aeration tank is discharged to the outside through the discharge pipe 3, the height of the U-shaped portion 5 is adjusted by the discharge pipe height adjusting device 6 to obtain an appropriate degree of concentration. Try to be. By doing so, it is possible to reduce the amount of water loss in the breeding water in the entire breeding apparatus. On the other hand, when the purification of the breeding water is urgent, the height of the U-shaped portion 5 may be lowered by the discharge pipe height fine adjustment device 6.

The above-mentioned discharge pipe height adjusting device 6 is shown in FIGS.
As shown in the figure, a seat 60 on which the U-shaped part 5 is placed and the seat 6
A support body 6 that can be moved in the vertical direction by connecting to 0 and screwing to a fixed portion such as a protruding portion of the aeration tank a.
1, and has a configuration in which the U-shaped portion can be raised and lowered by rotating the support body 61. Further, since the discharge pipe height fine adjustment device 6 only needs to be able to raise and lower the U-shaped portion 5 in the vertical direction, one end of the rope 63 via the pulley 62 is connected to the U-shaped portion 5 as shown in FIG. Connect the other end to the unwinder 64,
The U-shaped portion 5 may be moved up and down while unwinding and winding the rope 63 by operating the unwinder 64.

As shown in FIG. 4, the polluted foam A sent from the aeration tank a side to the polluted foam water storage tank 4 through the drain pipe 3 is stored as polluted water B in the polluted foam water storage tank 4. When the water level C of the polluted water B rises to cover the discharge-side end of the drain pipe 3 as shown in FIG. The feeding of the polluted foam due to the exhaust pressure is suppressed, and the discharge of the polluted foam to the outside and the breeding water in the aeration tank are stopped. In order to utilize this point, in the foam separation device 1,
The upper limit position of the discharge port of the drainage pipe 3 in the polluted foam water storage tank 4 is changeable, and when the upper limit position of the drainage port is changed as necessary, the water level C of the polluted water B reaches that position. The discharge of polluted foam and the discharge of breeding water from the aeration tank a are stopped. Specifically, as shown in FIG. 1, the drainage pipe 3 is provided with a plurality of outlets 8 at different positions in the height direction on the discharge side in the polluted foam water storage tank 4 and through the opening / closing valves 7, respectively. It is connected. In this manner, the plurality of outlets 8 that can be respectively opened and closed on the outlet pipe 3
Is provided, it is possible to adjust the water level C of the polluted water B by opening and closing the discharge port 8 as necessary. That is, the total amount of water sent out from the aeration tank a is controlled. FIG.
In the example shown in (1), the uppermost opening / closing valve 7 is closed, and the outlet 8 located below the uppermost opening / closing valve 7 is set as the outlet upper limit.

[0011]

As described above, the foam separator of the present invention is provided with a shade-shaped foam collector connected above the aeration tank to collect the polluted foam generated in the aeration tank, and a top of the foam collector. U which is connected upwardly and projects upwardly above the foam collector.
It is characterized in that it is provided with a flexible discharge pipe having a character portion for guiding polluted foam to the outside, and a discharge pipe height fine adjustment device for raising and lowering the U-shaped portion of the discharge pipe. As a result, the discharge speed of the polluted foam can be freely controlled by adjusting the U-shaped portion of the drain pipe up and down without any trouble as compared with the conventional water level adjustment method using a baffle plate. In addition, it is necessary to regularly clean the foam collector, drainage pipe, and the like, because adhesive dirt gradually accumulates and hinders normal discharge. However, in a foam separation device incorporating a conventional aerator, it takes a lot of work to remove it, but in the device of the present invention, a foam collector, a discharge pipe, and a discharge pipe height adjustment device are basically configured. Since it is easy to remove, it can be washed without labor. Furthermore, by placing a polluted foam water storage tank on the discharge side of the discharge pipe and changing the upper limit position of the discharge pipe outlet in the polluted foam water storage tank, the total amount of foam discharged from the aeration tank can be controlled. It has an effect that is excellent in practicality, for example, the loss of water can be reduced.

[Brief description of drawings]

FIG. 1 is an explanatory view showing one embodiment of a foam separation device according to the present invention.

FIG. 2 is an explanatory diagram showing a drain pipe height fine adjustment device in one embodiment.

FIG. 3 is an explanatory view showing another example of the drainage pipe height adjusting device.

FIG. 4 is an explanatory view schematically showing a discharge state of a polluted foam.

FIG. 5 is an explanatory view schematically showing a state in which discharge of polluted foam is stopped.

FIG. 6 is an explanatory diagram showing a conventional example.

FIG. 7 is an explanatory view showing a conventional example.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Foam separator 2 ... Foam collector 3 ... Discharge pipe 4 ... Contaminated foam water storage tank 5 ... U-shaped part 6 ... Discharge pipe height fine adjustment device 7 ... Opening / closing valve 8 ... Discharge port

Claims (3)

[Claims] 1. A cap-shaped foam collector connected above an aeration tank to collect polluted foam generated in the aeration tank; and a cap-shaped foam collector connected to the top of the foam collector and directed upward above the foam collector. And a discharge pipe height fine adjustment device for moving the U-shaped portion of the discharge pipe up and down, and a flexible discharge pipe having a convex U-shaped portion for guiding polluted foam to the outside. . 2. A polluted foam water storage tank located below the water level of the aeration tank is provided on the discharge side of the discharge pipe, and the discharge pipe upper limit position in the polluted foam water storage tank is changed. The foam separation device according to claim 1, which is provided so as to be capable. 3. The foam separation device according to claim 2, wherein a plurality of discharge ports are connected to the discharge pipes in the polluted foam water storage tank at different positions in the height direction via open / close valves.