JPH06226248A - Aeration element for surfactant separator for household - Google Patents

Abstract

PURPOSE:To enable the effective generation of relatively large bubbles by constituting an aeration element to be used for a device for effectively separating surfactants from the waste water liquid of a washing machine, etc., to a multilayered structure consisting of inside layers having numerous fine pores and outside layers having numerous coarse holes. CONSTITUTION:The surfactant separator for the washing machine has a water storage tank 2 for storing the waste water liquid 3 from the washing machine 1 and generates the air bubbles by operating an aeration means 4 consisting of the aeration element 4a and air pump 4b immersed in this water storage tank 2 and blowing air into the waste water. The surfactants in the waste water liquid are adsorbed on the surfaces of the air bubbles and are floated and after the air bubbles are introduced through an air bubble storage tank 5 to a bubble rupturing means 6, the surfactants are recovered into a treating tank 7 by liquefying the air bubbles. The aeration element 4a is made into the multilayered structure consisting of the inside layers the having numerous fine pores and the outside layers having the numerous coarse holes. The outside layers are so formed that the pore sizes decrease successively along the longitudinal direction of the element and generate the relatively large air bubbles.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an exposing element for efficiently separating a surfactant from a drainage liquid of a washing machine or the like.

[0002]

2. Description of the Related Art Conventionally, a lot of surfactants are contained in the drainage liquid produced by washing clothes and washing dishes in a general household, and some of them still have an activity. ing. However, conventional washing machines, dishwashers, and system kitchens do not have the function of separating and collecting surfactants from this drainage liquid, and these drainage liquids are discharged outside without any treatment. Although it has been a factor of water pollution, recently, a method of separating and collecting by bubbles has been proposed.

A method of separating the surfactant by the foam will be described based on an example of washing liquid of a washing machine with reference to FIGS. 5, 6, 7, 8 and 9.

FIG. 5 is a block diagram of a surfactant separating device for a washing machine. By supplying the drainage liquid 3 from the washing machine 1 into the water storage tank 2 and operating the exposure means 4 including the exposure element 4a and the air pump 4b to blow air into the drainage liquid,
When air bubbles are generated, the air bubbles adsorb the surfactant in the waste water on the surface thereof and float to the upper surface of the waste water. By continuing the exposure, the bubbles floating on the upper surface of the drainage liquid rise in the bubble retention tank 5 provided thereon and are guided to the bubble breaking means 6. The bubbles adsorbing the surfactant are liquefied by the bubble breaking means 6 and collected in the surfactant treatment tank 7. Therefore, the water tank 2
The concentration of the surface active agent in the liquid treated by the above and discharged from the drain port 8 becomes low, and the pollution of the river is improved.

At this time, the size and amount of bubbles have a great influence on the separation characteristics of the surfactant. FIG. 6 shows the relationship between the bubble diameter and the water carry-out rate / surfactant recovery rate, and FIG. 7 shows the relationship between the exposure amount (foam quantity) and the water carry-out rate / surfactant recovery rate. For example, when the bubble diameter is small and the bubble amount is large (exposure amount is large), the bubbles take out water together as shown in FIGS. 6 and 7, and it becomes practically impossible to separate the surfactant. On the contrary, if the bubble diameter is too large, the efficiency of collecting the surfactant with respect to the exposure amount becomes extremely poor. Further, FIG. 8 shows the relationship between the surfactant concentration of the waste water and the water carry-out ratio / surfactant recovery amount, and FIG. 9 shows the relationship between the foam retention tank volume and the water carry-out ratio / surfactant recovery ratio. As can be seen from FIGS. 8 and 9, the influences of the concentration of the surfactant in the drainage liquid and the size of the bubble retention tank are very large,
The generation of bubbles needs to be finely controlled.

[0006]

However, there are various exposure elements for generating bubbles, which are for treating sewage. However, in order to efficiently separate the surfactant from the drainage liquid of the washing machine, etc. No one has suitable properties.

The present invention solves the above problems, and it is a first object of the present invention to provide an exposure element capable of uniformly generating relatively large bubbles over the entire surface of the element with a relatively small exposure amount. A second object is to provide an exposure element that more efficiently separates the surfactant with the same exposure amount when continuously separating the surfactant. A third object of the present invention is to provide an exposure element which suppresses the amount of water taken out and efficiently separates the surfactant by continuous surfactant separation. A fourth object is to provide an exposure element that can generate relatively large bubbles uniformly over the entire surface of the element at a low cost and with a relatively small exposure amount.

[0008]

In order to achieve the first object of the present invention, the inner layer of the exposure element is made of a material having a large number of fine holes and the outer layer has a large number of rough holes. The first problem-solving means is to have a multi-layered structure made of the materials described in 1.

In order to achieve the second object,
A second problem solving means is that the hole diameter of the outer layer of the exposure element is configured to be gradually reduced along the longitudinal direction of the element.

Further, in order to achieve the third object,
The third aspect is that the aperture ratio of the holes in the inner layer and the outer layer of the exposure element is sequentially increased along the longitudinal direction of the element.
Is used as a means for solving the problem.

In order to achieve the above-mentioned fourth object,
The fourth problem solving means is that about half of the upper surface of the exposure element is masked pneumatically.

[0012]

[Function] The bubbles generated by the exposure element have the following properties. The bubble diameter is determined by the hole diameter of the exposing element, the hydrophilicity of the element material, and the discharge pressure of air at the hole outlet. Among these three factors, the influence of the hole diameter is particularly large. Further, the amount of bubbles generated is almost proportional to the amount of air (exposure amount) passing through the hole, and the amount of air is inversely proportional to the air resistance to the outlet of the hole.

According to the first means for solving the problems described above, the present invention provides a constant air resistance by the fine holes in the inner layer of the exposure element to make the amount of air to each part of the element constant, and then the outer layer of the element. By increasing the pore size, relatively large bubbles can be uniformly generated over the entire surface of the element.

Further, the second problem solving means makes it possible to generate small bubbles in sequence along the longitudinal direction of the exposure element.

Further, by the third problem solving means, it is possible to generate a large amount of bubbles in sequence along the longitudinal direction of the exposure element.

Further, according to the fourth problem solving means, bubbles can be uniformly generated over the entire surface of the element with a simple structure.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment of the present invention will be described below with reference to the drawings.

In FIG. 1, a relatively large powder of polypropylene is sinter-molded, and a relatively small powder of polypropylene is sinter-molded to have a small continuous hole inside the outer layer 11 having a relatively large continuous hole. In addition, the hollow inner layer 12 is arranged in close contact, one of the hollows is closed with a lid 13, and a pipe 14 for introducing air is provided on the opposite side to form an exposure element.

The operation of the above structure will be described with reference to FIGS. When air is sent from the air pump 4b to the air introduction pipe 14 of the exposure element 4a installed on the bottom surface of the water tank 2, the air reaches the outer layer 11 through the small holes of the inner layer 12, and the comparison of the outer layer 11 is made. The outer surface of the outer layer 11, that is, the drainage liquid is reached through the large holes. This air is pushed into the drainage liquid by the air sent from the air pump 4b one after another, and bubbles having a diameter substantially determined by the size of the pores of the outer layer 11 and the surface tension of the drainage liquid (≈surfactant concentration) are discharged. Generate on the surface. While the bubbles are rising in the bubble retention tank 5, moisture is dropped downward by attractive force to form bubbles having a high surfactant concentration, which are guided to the bubble breaking means 6, liquefied and stored in the surfactant treatment tank 7.

By the way, the amount of air pushed out from each hole of the exposure element: A1 is the air discharge pressure of the air pump 4b is V
o, the air resistance from the air pump 4b to the hollow portion of the inner layer 12 of the exposure element is Ra, the air resistance per hole of the inner layer 12 is Rb1, the air resistance per hole of the outer layer 11 is Rc1, the outer layer Let Rd1 be the air resistance due to the water pressure from the surface of 11 to the surface of the drainage liquid. Becomes a small value, and if Rb1 does not exist, Rc1≤ (Ra + Rd1), and A1 is greatly affected by Rd1. That is,
When the exposure element is installed tilted in the drainage liquid, bubbles are generated only from the higher side and bubbles are not emitted from the lower side, or bubbles are emitted from the upper surface of the exposure element but bubbles are generated from the lower surface. The phenomenon that it does not appear occurs. When the inner layer 12 of the present embodiment is provided and Rb1 is made large, Rb1 >> (Ra + Rc1 + Rd1), and A1 is hardly affected by Rd1 and Rc
The influence of the variation of 1 also becomes small and becomes a function of Vo and Rb1. Therefore, the air resistance (Rb1, Rb2, ...
If sinter molding is performed so that Rbn) becomes uniform, bubbles can be uniformly emitted from the exposure element.

By thus forming the exposure element in two layers and providing the inner layer with air resistance, relatively large bubbles can be uniformly generated over the entire surface of the exposure element with a relatively small exposure amount. . In this embodiment, the element is 2
Although it has a layered structure, it may have three layers, and although polypropylene is used for the sintering molding, polyethylene, polyvinylidene fluoride, or the like may be used.

The air amount Ao from the entire exposure element is
Naturally, it is expressed as follows. A1 + A2 + ……
An is the amount of air in each hole.

Ao = A1 + A2 + ... An Next, a second embodiment will be described with reference to FIGS. 2, 5, 6 and 8.

In FIG. 2, the outer layer is divided into three parts, that is, 11a having a rough hole, 11b having a medium hole, and 11c having a fine hole so that the bubble diameter at the time of exposure becomes smaller. To configure. The inner layer 12 is made of a sinter-molded resin having fine pores, and has a large air resistance,
It is configured so that the entire element can be exposed uniformly. Others are the same as those in FIG.

The operation of the above configuration will be described. Figure 5
In the above, the liquid containing the high-concentration surfactant is supplied from the washing machine 1 side to the exposure element 4b provided at the bottom of the water storage tank 2, but the washing machine 1 side is provided on the drain port 8 side. Since the surfactants are sequentially separated from the side by bubbles, a liquid having a low surfactant is supplied. Therefore, in the vicinity of the drainage port 8, the concentration of the surfactant is lower and the water carry-out rate is lower than the characteristics shown in FIG. 8, but the recovery amount of the surfactant is also low and the treatment capacity is also low. In order to prevent this, from the characteristics shown in FIG. 6, the recovery rate of the surfactant can be increased by reducing the bubble diameter to a point where the water removal rate can be compromised. By decreasing the bubble diameter of the exposure element in this way, it is possible to increase the processing capacity in a limited space.

Specifically, as described with reference to the configuration of FIG. 2, the hole diameters of the outer layers are reduced in the order of 11a, 11b and 11c, 11a of the exposing element 4a is on the washing machine 1 side, and 11c is the drain port 8. The above-mentioned object can be achieved by installing it toward the side.

As described above, according to this embodiment, since the foaming can be performed uniformly over the entire surface of the exposure element and the diameter of the foam can be reduced in order, it is possible to provide the surfactant separating apparatus having a good space factor.

A third embodiment will be described with reference to FIGS. In FIG. 3, an outer layer 21 having a relatively large continuous hole formed by sintering a relatively large powder of polypropylene.
A relatively small powder of polypropylene is sinter-molded on the inner side of the cylindrical inner layer 22 having small continuous holes, and the outer layer 21 and the inner layer 22 are 21a, 21a.
As shown in b and 21c, the number of holes is increased in order to increase the aperture ratio, the inner layer has a large air resistance, and the outer layer adjusts the bubble diameter. In addition, the hollow one of the inner layer 22 is attached to the lid 2
The deadline is 3, and a pipe 24 for introducing air is provided on the opposite side to form an exposure element.

The operation of the above configuration will be described. As shown in FIG. 7, the surfactant separation characteristics include the characteristics that both the water carry-out rate and the surfactant recovery rate increase with increasing exposure amount, and thus the surfactant as described in Example 2 is included. When the exposure element is placed in an environment in which the saliva flows continuously and the concentration of the surfactant gradually decreases, the exposure element is configured so that the exposure amount increases in order according to the concentration of the surfactant. By doing so, it is possible to provide a surfactant separation device having a high separation efficiency with respect to the space factor and the total exposure amount.

The fourth embodiment will be described with reference to FIG. The polypropylene powder is sintered and molded, and the cylindrical exposure resin 31 having continuous pores, the masking resin 32 for masking the upper half surface thereof, and one of the hollow portions of the exposure resin 31 are closed with a lid 33. A pipe 34 for introducing air is provided on the opposite side to form an exposure element.

In the above structure, when air is sent through the pipe 34 while the aforesaid exposure element is in the liquid, the air is extruded into the liquid through the holes of the exposure resin 31 to generate bubbles. At this time, since the upper half of the exposure resin 31 is covered with the masking resin 32, the difference in the air resistance due to the water pressure in each part of the exposure resin 31 becomes small, and the bubbles are evenly distributed along the longitudinal direction of the element. It tends to occur.

As described above, according to this embodiment, it is possible to uniformly generate bubbles along the longitudinal direction of the element with a simple structure.

[0033]

INDUSTRIAL APPLICABILITY As described above, according to the present invention, the inner layer of the exposure element is made of a material having an infinite number of fine holes, and the outer layer is made of a multi-layer structure made of a material having an infinite number of rough holes. As a result, relatively large bubbles can be uniformly generated over the entire surface of the device, and the surfactant can be efficiently separated.

Further, since the pore diameter of the outer layer is made smaller in order along the longitudinal direction of the element, the exposure element can be uniformly foamed over the entire surface and the bubble diameter can be successively decreased along the longitudinal direction of the element. It is possible to provide a surfactant separation device having a good space factor.

Further, by forming the aperture ratios of the holes of the inner layer and the outer layer to increase sequentially along the longitudinal direction of the element, a large amount of bubbles can be generated sequentially along the longitudinal direction of the exposing element. Therefore, when the exposure element is placed in an environment in which the surfactant concentration increases in order, by configuring the exposure element so that the exposure amount increases in accordance with the surfactant concentration, the space factor and It is possible to provide a surfactant separation device having high separation efficiency with respect to the total exposure amount.

By air-masking approximately half of the upper surface of the element, bubbles can be uniformly generated over the entire surface of the element with a simple structure.

[Brief description of drawings]

FIG. 1 is a diagram of a first embodiment of the present invention.

FIG. 2 is a diagram of a second embodiment of the present invention.

FIG. 3 is a diagram of a third embodiment of the present invention.

FIG. 4 is a diagram of a fourth embodiment of the present invention.

FIG. 5: Diagram of surfactant separation device

[Figure 6] Characteristic diagram of bubble diameter and surfactant recovery rate

[Figure 7] Characteristic diagram of exposure dose and surfactant recovery rate

FIG. 8: Characteristic diagram of surfactant concentration and surfactant recovery rate

FIG. 9: Characteristic diagram of bubble retention tank volume and surfactant recovery rate

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Washing machine 2 Water storage layer 4 Exposing means 4a Exposing element 5 Bubble retention tank 6 Bubble breaking means

Claims (4)

[Claims] 1. A water storage tank provided in a drainage path of a liquid containing a surfactant, an exposure means provided in this water storage tank, a bubble retention tank for bubbles generated by this means, and this bubble retention tank. In a surfactant separation device equipped with a bubble breaking means for liquefying bubbles that have passed through, an inner layer is made of a material having a large number of fine pores, and an outer layer is a multilayer made of a material having a large number of rough pores. The exposure element of the exposure means characterized by having the structure. 2. The exposure element according to claim 1, wherein the hole diameter of the outer layer is arranged to become smaller along the longitudinal direction of the element. 3. The exposure element according to claim 1, wherein the aperture ratios of the holes in the inner layer and the outer layer increase in order along the longitudinal direction of the element. 4. A water storage tank provided in a drainage path of a liquid containing a surfactant, an exposure means provided in this water storage tank, a bubble retention tank for bubbles generated by this means, and this bubble retention tank. In a surfactant separation device comprising a bubble breaking means for liquefying passing bubbles, about half the upper surface of the element is masked pneumatically, and the exposing element of the exposing means.