JPH06126091A - Device for drain treatment of electric washing machine - Google Patents

Abstract

PURPOSE:To recover the surfactant contained in a drain soln. to reutilize the same in an electric washing machine. CONSTITUTION:A first drain valve 2 for discharging a drain soln. is provided to the bottom part of a washing tub 1 and a detergent soln. is supplied to a first water tank 4 by a drain pump 3 to be stored therein. An aeration means 5 is provided in the first water tank 4 and air is supplied to an aeration element 5a by an aeration pump 5b in the aeration means 5 to generate air bubbles from the surface of the detergent soln. In the air bubble stagnation tank 6 integrated with the first water tank 4, the drain soln. present between air bubbles rising from the surface of the drain soln. by the action of the aeration means 5 is allowed to fall under gravity to perform drainage to be guided to an bubble breaking means 7. The liquid containing a surfactant generated by breaking air bubbles by the bubble breaking means 7 is stored in a second water tank 8 and again supplied to the washing tub 1 by a supply means 9 to be utilized.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a waste water treatment apparatus for an electric washing machine, which collects and reuses a surfactant contained in the waste water of the electric washing machine.

[0002]

2. Description of the Related Art Conventionally, when washing clothes or the like in an electric washing machine in a general household, a large amount of washing liquid is discharged. A lot of surfactants are contained in this drainage liquid, and some of them still have activity. There was no suitable method for treating wastewater with an electric washing machine, and no wastewater treatment equipment for treating wastewater was added, so wastewater was discharged untreated.

[0003]

However, in the above-mentioned conventional electric washing machine, since the surfactant having the activating power is contained, it is wasteful of the detergent to discharge the waste water having the cleaning action. There is also a problem that the drainage liquid containing the surfactant becomes one of the polluting factors of the river.

The present invention solves the above-mentioned conventional problems, and an object of the present invention is to provide a wastewater treatment apparatus for an electric washing machine, in which the surfactant contained in the wastewater can be separated and recovered and reused.

[0005]

In order to achieve the above object, the present invention has a first problem-solving means, which is a first water tank for storing a detergent liquid provided in the drainage path of a washing tank.
Aeration means provided in the first water storage tank, a bubble retention tank for retaining the bubbles generated by the aeration means, a bubble breaking means for breaking bubbles rising in the bubble retention tank, and this bubble breaking means. A second water tank for storing the liquid generated by
The second storage tank is provided with a supply means for supplying the liquid in the second storage tank to the washing tank, and the second problem solving means is to provide the water storage tank and the bubble retention tank in the washing tank. As a third means for solving the problems, the components such as the first water tank, the aeration means, the bubble retention tank, the bubble breaking means, the second water tank, and the supply means are provided in the main body of the electric washing machine. Further, as a fourth problem solving means, the bubble breaking means is composed of a bottomed cylindrical rotary container and a drive means for rotating the rotary container.

[0006]

In the above structure, the action of the first problem solving means is that the bubbles are retained in the bubble retention tank when the bubbles are generated by the aeration means provided in the first water storage tank, and the bubbles rise in the bubble retention tank. Is broken by the foam breaking means to be stored in the second water tank as a liquid, and the liquid is supplied to the washing tank by the supplying means. The function of the second problem solving means is to wash the water tank and the bubble retention tank. Since it is provided in the tank, the entire product can be downsized. The action of the third means for solving the problem is that the components of the processing apparatus are provided in the main body of the electric washing machine, and The recovery can be performed in the drainage process, and the washing process is not interrupted for a long time for the recovery. Furthermore, the action of the fourth problem solving means is that the drive means rotates the container at a high speed, Impacts the side of the container with centrifugal force. And, to cell breakage liquefied by the impact.

[0007]

Embodiments of the present invention will be described below with reference to the drawings.

1 and 2 show a first embodiment of the present invention. As shown in the figure, a first drain valve 2 for draining the drainage liquid is provided at the bottom of the washing tub 1, and the drainage pump 3 supplies and stores the detergent liquid in the first water storage tub 4. An aeration means 5 is provided in the first water storage tank 4 and comprises an aeration element 5a and an aeration pump 5b.
In b, air is supplied to the aeration element 5a to generate bubbles from the surface. The bubble retention tank 6 integrated with the first water storage tank 4 drops the drainage liquid existing between the bubbles rising from the water surface of the drainage liquid by the aeration means 5 by gravity and drains the drainage liquid to break the bubbles. It leads to 7. The liquid generated by the bubble breaking is stored in the second water storage tank 8 and supplied by the supply means 9
The liquid stored in the second water tank 8 is supplied to the washing tank 1 again. A second drain valve 10 for discharging drainage liquid is provided at the bottom of the first water storage tank 4.

FIG. 2 shows the structure of the bubble breaking means 7. That is, the bubble breaking unit 7 is composed of a rotary container 11 that receives bubbles supplied from the bubble retention tank 6, a driving unit 12 that rotates the rotary container 11, and a cover 13 provided on the outer peripheral portion of the rotary container 11.

Next, the operation will be described. At the end of the washing process, the first drain valve 2 is activated and the washing tub 1
Drain the drainage from the. Next, the drainage pump 3 is operated to supply the drainage liquid to the first water storage tank 4, and after supplying a predetermined amount,
The drain valve 2 and the drain pump 3 are stopped. Then, the aeration means 5 is operated to aerate the drainage liquid. The bubbles generated by aeration adsorb the surfactant contained in the drainage liquid on the surface and float to the upper surface of the drainage liquid, and a small amount of drainage liquid is present between the bubbles floating on the upper surface of the drainage liquid and the bubbles. Exists. The drainage liquid existing between the bubbles is the bubble retention tank 6
The water is drained by raising the to drop by the action of gravity. This makes it possible to increase the concentration of the surfactant in the rising bubbles. Further, the bubbles on the upper surface of the drainage liquid can be removed by continuing the aeration.
Is guided to the bubble breaking means 7. At the same time as supplying bubbles from the tip of the bubble retention tank 6 to the substantially center of the rotary container 11, the driving means 12 is operated to rotate the rotary container 11 at high speed. As a result, the bubbles supplied to the rotary container 11 collide with the side surface of the rotary container 11 due to the centrifugal force generated by the rotation, and are broken by the impact. The liquid generated by the bubble breaking rises on the side surface of the rotary container 11 and
The water is scattered from the upper end of the water, is supplied to the cover 13, is collected in the drainage port provided in the lower part, is guided to the second water storage tank 8 and is stored therein. The recovered surfactant liquid stored in the second water tank 8 is supplied to the washing tank 1 by operating the supply means 9 at the next washing. Then, even when aeration is performed, the aeration means 5 is stopped at the time when the bubbles no longer float in the drainage liquid, and the second drainage valve 10 is operated to drain the drainage liquid in the first water storage tank 4. After that, if the drainage liquid exists in the washing tub 1, the drainage valve 3 and the drainage pump 4 are operated to supply the drainage liquid to the first water storage tank 4, and the cycle for collecting the surfactant again is executed. To do. When the water storage capacity of the first water tank 4 is smaller than the maximum wash water capacity of the washing tank 1, a large amount of the recovered surfactant solution is obtained from the waste water by repeating the above cycle.

In this way, the surfactant is separated and collected from the drainage liquid in the washing tub 1 and reused.
It is possible to reduce the amount of detergent added to the new tank and reduce the pollution of rivers because the amount of surfactant in the discharged drainage liquid is low.

FIG. 3 is a diagram showing the relationship between the cumulative aeration amount and the recovery rate of the surfactant. As shown in the figure, the recovery rate of the surfactant increases almost proportionally when aeration is continued, and stops increasing when the predetermined recovery rate R% is reached. This is because the concentration of the surfactant in the drainage liquid decreases due to the collection, bubbles are not generated, and the collection cannot be performed. The liquid stored in the second water tank 8 contains the surfactant in a state of being concentrated in concentration higher than the concentration of the drainage liquid, and the concentration thereof is several times that of the drainage liquid. .

FIG. 4 shows the relationship between the residence time in the bubble retention tank 6 and the surfactant concentration in the recovered liquid. As shown in the figure, the concentration ratio of the collected surfactant liquid to the drainage liquid is determined by the retention time of bubbles in the bubble retention tank 6 if the aeration rate in the aeration means 5 is constant. It can be seen that the longer the liquid remains in the bubble retention tank 6, the better the liquid draining between the bubbles, and the higher the concentration of the surfactant liquid during recovery.

FIG. 5 shows the relationship between the detergent concentration and the detergency when the collected surfactant solution is not used and when it is used. That is, the curve a shows a higher detergency as the concentration becomes higher when the collected surfactant solution is not used, whereas the curve b shows the case where a fixed amount of the collected surfactant solution is added to each unused detergent. This shows the change in detergency. T1 is usually used in fresh detergent
It is a standard concentration and the detergency at this concentration is S
The detergent concentration of the curve b showing the detergency of S1 is T2, and the difference between T1 and T2 indicates the amount of unused detergent that can be reduced by using the recovered surfactant solution.

FIG. 6 shows a second embodiment of the present invention. In the figure, the parts with the same numbers as in FIG. 1 are the same parts. The difference from the first embodiment is that a water tank 14 and a bubble retention tank 15 for storing a detergent liquid are provided inside a washing tank 16. With this configuration, the product can be downsized.

FIG. 7 shows a third embodiment of the present invention. In the figure, the parts with the same numbers as in FIG. 1 are the same parts. The difference from the first embodiment is that the components of the wastewater treatment device are provided inside the main body 17 of the electric washing machine. With this configuration, the product can be downsized, and the surfactant liquid is collected from the drainage liquid by aeration in the drainage process, so that the washing process can be performed without interruption for a long time. , After the drainage is completed, it is possible to immediately proceed to the next step, and the drainage treatment does not increase the total washing time.

[0017]

As is apparent from the above embodiments, the waste water treatment apparatus for an electric washing machine according to the present invention is provided with a first water tank for storing the detergent liquid provided in the drainage path of the washing tank and the first water tank. Aeration means provided in the water storage tank, a bubble retention tank for retaining bubbles generated by the aeration means, bubble breaking means for breaking bubbles rising in the bubble retention tank, and liquid produced by the bubble breaking means And a supply means for supplying the liquid in the second water tank to the washing tank. With this configuration, the surface activity of the waste water after washing can be reduced. Since the agent can be collected and reused, the amount of detergent used can be reduced, and the amount of surfactant in the drainage liquid can be reduced, so that pollution of the river can be reduced.

[Brief description of drawings]

FIG. 1 is a vertical cross-sectional view showing a wastewater treatment device for an electric washing machine according to a first embodiment of the present invention.

FIG. 2 is a cross-sectional view showing a foam breaking unit of the wastewater treatment device of the electric washing machine.

FIG. 3 is a diagram showing a relationship between a cumulative aeration amount and a surfactant recovery rate in the wastewater treatment device of the electric washing machine.

FIG. 4 is a diagram showing the relationship between the residence time in the bubble retention tank and the concentration of the surfactant liquid during recovery in the wastewater treatment device of the electric washing machine.

FIG. 5 is a diagram showing a relationship between detergent concentration and detergency in the wastewater treatment device of the electric washing machine.

FIG. 6 is a vertical sectional view showing a wastewater treatment device for an electric washing machine according to a second embodiment of the present invention.

FIG. 7 is a vertical sectional view showing a wastewater treatment device for an electric washing machine according to a third embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Washing tank 4 1st water storage tank 5 Aeration means 6 Bubble retention tank 7 Bubble breaking means 8 2nd water storage tank 9 Supply means

Claims (4)

[Claims] 1. A first water tank for storing a detergent liquid provided in the drainage path of a washing tank, an aeration means provided in the first water tank, and bubbles for accumulating bubbles generated by the aeration means. A holding tank, a bubble breaking unit for breaking bubbles rising in the bubble holding tank, a second water tank for storing the liquid generated by the bubble breaking unit, and a liquid in the second water tank for washing. A wastewater treatment device for an electric washing machine, comprising a supply means for supplying the tub. 2. The wastewater treatment device for an electric washing machine according to claim 1, wherein the water storage tank and the bubble retention tank are provided in the washing tank. 3. A first water storage tank, an aeration means, a bubble retention tank,
The wastewater treatment device for an electric washing machine according to claim 1, wherein the foam breaking means, the second water tank, the supplying means and the like are provided in the main body of the electric washing machine. 4. The bubble breaking means comprises a rotary container having a bottomed cylindrical shape,
The wastewater treatment device for an electric washing machine according to claim 1, 2 or 3, which is configured by a driving unit that rotates the rotating container.