JPH0832290B2 - Two-liquid separator - Google Patents

Description

Description: TECHNICAL FIELD The present invention relates to a device for efficiently separating two liquids having different specific gravities in a mixed state such as oil and water, flon and water, and flon and oil, for example, for marine vessels. Regarding equipment that can separate oil and water of bilge waste liquid and factory waste liquid, and further separation of impurity liquid such as drinking water,
In addition, it is another object of the present invention to provide a two-liquid separation device that can purify the liquid to be separated after removing the impurity liquid.

[Conventional technology]

As a technique for separating two liquids in a mixed state, a baffle plate separation method, an inclined plate separation method, a coalescer method and the like are well known. In these processes, obstacles and inclined plates are installed in the flow path through which the mixed liquid passes, and in the process of passing through these obstacles and inclined plates, the two liquids are gradually separated by a physical difference in specific gravity over time. This is the basic principle.

[Problems to be Solved by the Invention]

However, for example, in an oil-water mixture in a suspended state, since ions are adsorbed on the surface of the colloidal particles of oil, a zeta potential due to the electric double layer is generated at the interface with the water liquid, which is caused by this zeta potential. Due to the Coulomb force, the oil particles repel each other stably and float in a stable manner, and especially in a low-concentration oil-water mixture, the distance between the colloidal particles of the oil is large, so the Coulomb repulsive force due to the zeta potential is better than the intermolecular attractive force. However, there is a problem that the two liquids cannot be separated by a conventional physical method.
In addition, in the oil-water mixture that has been emulsified by mixing the surfactant, the oil particles are smaller and the binding potential between water and oil particles is also high. It was impossible.

Further, the conventional two-liquid separation device only has a two-liquid separation function, and if the separated liquid after the removal of the impurity liquid is to be reused, a purification treatment step by a separately provided purification device is required, and the treatment work is There is a problem that the processing becomes complicated and the processing time becomes long.

The present invention has been made in view of the present situation, and can be applied not only to two-liquid separation of a mixed liquid of normal concentration but also to a mixed liquid of low concentration or an emulsified mixed liquid, and the separation efficiency is also high. It is an object of the present invention to provide an extremely high two-liquid separating apparatus, and also to provide a two-liquid separating apparatus that can simultaneously purify liquid to be separated.

[Means for solving the problem]

Here, in order to avoid confusion, the separated liquid and the liquid to be separated are defined as follows.

Separated liquid: A liquid that collects a small amount of impurity liquid such as oil in an oil-water mixed liquid that is present in the mixed liquid and is the object of separation and recovery.

Liquid to be separated: A liquid that occupies most of the mixed liquid, such as a water liquid in an oil-water mixed liquid, and refers to a liquid after removal of an impurity liquid.

The two-liquid separating apparatus of the present invention, which has solved the above-mentioned problems in the prior art, has the following configuration.

The outer cylinder electrode also serving as the main body container and the inner cylinder electrode arranged concentrically with respect to the outer cylinder electrode and set to the same potential as the outer cylinder electrode are electrically connected to the outer cylinder electrode and the inner cylinder electrode. Insulated load electrodes are provided concentrically to form a mixed liquid passage space for circulating the two-liquid mixed liquid in the upward direction between the respective electrodes, and the upper part of the mixed liquid passage space is discharged to the outside of the main container. Separated liquid collection space that has an outlet at the top and has a volume for temporarily storing the separated liquid, and that has a detection part of an interface detection sensor that monitors the position of the interface between the separated liquid and the mixed liquid in the space. And an automatic valve whose opening and closing is controlled by the output signal of the interface detection sensor is provided in the discharge passage communicating with the discharge port, and the mixed liquid after the impurity liquid is removed downward inside the inner cylindrical electrode. Providing a space for the mixed liquid to flow out toward It is made by applying a voltage capable of neutralizing the zeta potential of impurity liquid particles in the mixture between the outer tubular electrode and the inner tube electrode and the load electrode configuration.

The separated liquid collecting space can be provided outside the main body container, and can be provided, for example, at the upper or lower part of the main body container or at both the upper and lower parts. It is also possible to use an electrode other than the inner cylinder electrode as the electrode located on the opposite side of the outer cylinder electrode with the load electrode interposed therebetween to form an electric field with the load electrode. It is also possible to provide a tubular electrode having a separated liquid flow space in the center of the main body container.

A plurality of tubular electrodes may be arranged radially around the substantial center of the main body container.

Further, as the cargo power source, it is preferable to use an AC voltage of 1 to 10 V / cm when the oil-water mixed liquid is the processing target, and particularly when the emulsified oil-water mixed liquid is the processing target.
It is preferable to use an alternating voltage of 10 to 50 V / cm.

In addition, when a mixed liquid having a high insulating property such as CFC mixed oil is to be treated, there is no risk of electrolytic corrosion of the electrodes.
A DC voltage can be used as the load power source, and an AC voltage or DC voltage of 100 to 200 V / cm, or a superimposed voltage of the DC voltage and the AC voltage can be used as the load voltage.

It is preferable to interpose a porous dielectric having a multi-electrode effect between the outer cylinder electrode and the load electrode without a gap.

Further, the mixed liquid flowing through the mixed liquid passage space formed between the outer cylinder electrode and the load electrode needs to flow in the height direction of the container, but from the viewpoint of separating the mixed liquid, the upward flow is particularly required. Is preferred.

In addition, either or both of the SS removal layer and the organic matter adsorption layer for removing fine suspended solids (hereinafter, referred to as SS particles) are provided in the space where the liquid to be separated after the removal of the impurity liquid passes. It is also preferable to provide this device with a purification function of the liquid to be separated, and further, a perforated plate electrode having the same potential as the load electrode is provided in contact with the surface of the SS removal layer or the organic matter adsorption layer. It is also preferable to increase the electric field strength on the surface of the SS removal layer or the organic substance adsorption layer.

[Work]

The two-liquid separation by the two-liquid separating apparatus of the present invention having such a structure is performed as follows.

In the apparatus according to the first aspect, the mixed liquid supplied from the outside of the main body container first flows upward in the mixed liquid flow space formed between the outer cylinder electrode and the load electrode and between the inner cylinder electrode and the load electrode. Distributed. Impurity liquid particles to be separated float in the mixed liquid before passing through the mixed liquid circulation space, and the liquid particles selectively adsorb cations or anions in the liquid depending on their properties, resulting in the surface. Are charged, form an electric double layer with other liquid around them, and have a zeta potential. Since the surface charge of each liquid particle is the same pole, each liquid particle repels due to the Coulomb force due to the zeta potential and floats stably.

Since a voltage of a magnitude that can cancel the zeta potential of the liquid particles is applied between the outer cylinder electrode and the load electrode, the zeta potential of the liquid particles in the mixed liquid during the process of passing through the mixed liquid circulation space is The liquid particles are neutralized, and as a result, the liquid particles are agglomerated and coarsened by the action of intermolecular attraction. The coarse particle liquid particles float or settle due to the difference in specific gravity from the surrounding liquid, and the mixed liquid is separated into a separation liquid mainly containing the impurity liquid and a liquid to be separated from which the impurity liquid has been removed.

When the separated liquid has a low specific gravity, the separated liquid is stored in the separated liquid collecting space provided in the upper portion of the main body container, and then discharged to the outside of the main body container from an outlet provided in the separated liquid collecting space, while When the separated liquid has a high specific gravity, it is guided downward through the space into which the liquid to be separated flows formed in the inner cylinder electrode. The amount of the separated liquid accumulated in the separated liquid collecting space increases with the passage of time. The amount of the separated liquid accumulated in the separated liquid collecting space is constantly monitored by the interface detection sensor. The interface detection sensor has its detection part positioned at a predetermined height position in the separated liquid collection space, and when the two-liquid interface becomes lower than the set position of the detection part of the interface detection sensor, a signal is sent from the interface detection sensor. Based on this signal, the automatic valve installed in the discharge passage communicating with the discharge port provided at the top of the separated liquid collection space is opened, and the separated liquid in the separated liquid collection space is automatically discharged through the discharge passage. It Then, when the separation liquid is discharged and the interface between the two liquids becomes higher than the set position of the detection unit, the state is detected by the interface detection sensor, and the automatic valve is closed. As described above, in the device of the present invention, the separation liquid is automatically collected and discharged, and the device is continuously operated. Further, since the separated liquid is discharged from the uppermost part of the separated liquid collecting space, a highly pure separated liquid can be collected.

Further, in the two-liquid separation device according to the second aspect, while the mixed liquid passes between the outer cylinder electrode and the load electrode and between the load electrode and the tubular electrode, the impurity liquid particles have their zeta potential canceled out and the intermolecular liquid particles are intermolecular. It aggregates into coarse particles by force and floats or sinks depending on its specific gravity. If the specific gravity of the separated impurity liquid is lighter than that of the surrounding liquid, it will be collected in the separated liquid collection container for collecting the floating separated liquid that is connected to the upper part of the main body container, while the specific gravity of the impurity liquid is heavier than that of the surrounding liquid. In this case, the separated liquid is collected in the separated liquid collecting container for collecting the settled separated liquid, which is connected to the lower part of the main body container. The detection part of the interface detection sensor is located in the separated liquid collection container that is connected to both or one of the upper part and the lower part of the main container, and the amount of separated liquid accumulated inside the container is constantly monitored. There is. When the amount of the separated liquid exceeds a predetermined amount, the automatic valve provided in the discharge passage is opened by the signal sent by the interface detection sensor, and the separated liquid in the separated liquid collection container is automatically discharged through the discharge passage. At this time, the separated liquid in the separated liquid collecting container for collecting the floating separated liquid is discharged through a discharge passage communicating with the discharge port provided at the top of the container, while the separated liquid in the separated liquid collecting container for collecting the settled separated liquid is collected. The separated liquid is discharged through a discharge passage that communicates with a discharge port provided at the bottom of the container. When the discharge of the separated liquid progresses and the amount of the separated liquid in the separated liquid collection container becomes a predetermined amount or less, the state is detected by the interface detection sensor, and the automatic valve is closed.

The impurity liquid thus collected is periodically withdrawn from the separation liquid collection container, while the separated liquid from which impurities have been removed is discharged to the outside of the container through the separation liquid flowing space inside the tubular electrode. It

Further, as described in the third aspect, a plurality of tubular electrodes having a flow-down space for liquid to be separated formed therein are radially arranged inside the outer tubular electrode, and both electrodes are provided between the outer tubular electrode and the tubular electrode. When a load electrode with a potential difference is provided concentrically with respect to the outer cylinder electrode, coagulation and coarsening of impurity liquid particles occur between each tubular electrode and the load electrode and between the outer cylinder electrode and the load electrode. That is, the separated liquid after the removal of the impurity liquid is discharged to the outside of the container through a plurality of paths through the separated liquid flowing space in each tubular electrode. Since the liquid to be separated is discharged through a plurality of spaces in which the liquid to be separated flows, it is possible to process a large amount of the mixed liquid at one time, and it is possible to improve the processing efficiency. In this case as well, the separated liquid is temporarily stored in the separated liquid collecting container provided in one or both of the upper part and the lower part of the main body container, and when the collected amount of the separated liquid in the separated liquid collecting container becomes a certain amount or more, The automatic valve provided in the discharge passage is opened and discharged based on the signal from the interface detection sensor, while the automatic valve is closed when the discharge progresses and the collection amount of the separated liquid collection container falls below a certain amount. To be done.

Further, when a porous dielectric having a multi-electrode effect is interposed between the outer cylinder electrode and the load electrode without any gap, the polarization of the dielectric increases the electric field strength in each part between the two electrodes, and moreover, between the electrodes. Since the flowing mixed liquid always passes through the dielectric body, the efficiency of two-liquid separation is enhanced.

When one or both of the SS removal layer and the organic matter adsorption layer are installed in the space where the liquid to be separated moving toward the space to be separated flows, the residual impurities in the liquid to be separated after the impurities are removed are filtered by the SS removal layer. Since it can be removed by the effect or the electrostatic adsorption ability of the adsorbent, the liquid to be separated can be purified, and it is not necessary to install a separate purification device other than this device.

Further, when a perforated plate electrode having the same potential as the charging electrode is provided in contact with the surface of the SS removal layer or the organic adsorbent layer,
The filter effect can be enhanced by increasing the electric field strength at each site in the SS removal layer or the organic substance adsorbent layer,
A cake layer can be formed on the surface of the SS removal layer or the organic matter adsorption layer by the Coulomb force, and the cake liquid can be added to the original filter effect of the SS removal layer or the organic matter adsorption layer. By adding the filter effect of the layer, highly accurate filtration becomes possible.

〔Example〕

Next, details of the present invention will be described based on illustrated embodiments. FIG. 1 (a) is a longitudinal sectional view for explaining the most basic embodiment of the two-liquid separating apparatus according to the present invention, and FIG. 1 (b) is a transverse sectional view of the same embodiment.

In the figure, 1 is an outer cylinder electrode which also serves as the main body container A, and an inner cylinder electrode 2 having the same potential as the outer cylinder electrode 1 is concentrically arranged inside the outer cylinder electrode 1. Further, between the outer cylinder electrode 1 and the inner cylinder electrode 2, a load electrode 3 electrically insulated from both electrodes is provided between the outer cylinder electrode 1 and the inner cylinder electrode 2 via holding insulators 4, 4 ,.
Are arranged concentrically with respect to each other to form a mixed liquid passage space 5 which can flow vertically between the respective electrodes, and the liquid to be separated after the impurity liquid is removed downward inside the inner cylindrical electrode 2. A space 6 into which the liquid to be separated flows is provided for guiding.

A mixed liquid inlet 7 for inflowing a two-liquid mixed liquid such as an oil-water mixed liquid is opened in the lower part of the side surface of the main body container A, and a substantially liquid-containing mixed liquid inlet 7 is provided at a substantially center of a bottom surface of the container after removing an impurity liquid such as separated water. The separated liquid discharge port 8 for discharging the separated liquid is opened. Further, a separated liquid storage space 9 for storing the separated and floated separated liquid is formed in the upper part of the internal space of the container body A, and a separated liquid discharge port 10 for discharging the separated liquid is provided on the container canopy.
Is provided.

The inner cylinder electrode 2 is made to have the same potential as the outer cylinder electrode 1 by holding and fixing the lower end of the inner cylinder electrode 2 to the bottom surface of the main body container A, and the load electrode 3 concentrically arranged between the two electrodes has a potential difference with respect to both electrodes. This potential difference is given by connecting one of the output terminals of the power supply device 11 to the outer cylinder electrode 1 and the other terminal to the load electrode 3.

The power supply device 11 can use either a DC power supply or an AC power supply when a processing liquid having a high power resistance such as a mixed liquid of CFC and oil is used, but when the electric resistance is low like an oil / water mixed liquid, It is preferable to use an AC power source because of the possibility of electrolytic corrosion.

The applied voltage is set on the basis of a size capable of canceling the zeta potential of the impurity liquid particles to be separated in the mixed liquid. Generally, the smaller the electric resistance of the mixed liquid, the larger the applied voltage. Low, for example, an AC voltage of 1 V / cm to 10 V / cm in the case of oil-water mixture, or 100 / cm for a mixture having high electric resistance such as a mixture of CFC and oil.
An alternating voltage of cm to 200 V / cm is used. The applied voltage also depends on the state of the mixed liquid. For example, in the case of an oil-water mixed liquid that is emulsified by mixing a surfactant, etc.,
Since the binding potential between oil particles and water particles is high, the applied voltage is also
It should be set to 10V / cm to 500V / cm. As for the applied voltage, if a DC voltage is used for a mixed solution having a low electric resistance, the electrodes may be electrolytically corroded, so it is necessary to use an AC voltage. It is also possible to use a DC voltage or a superimposed voltage of an AC voltage and a DC voltage. In particular, when a superimposed voltage of a DC voltage and an AC voltage is used, the separation efficiency can be improved by devising a combination of both voltages.

In the figure, reference numeral 12 denotes a mesh-like porous dielectric material disposed between the outer cylinder electrode 1 and the load electrode 3 and between the inner cylinder electrode 2 and the load electrode 3, and is made of resin such as glass wool or polypropylene. To be The dielectric 12 is interposed between the electrodes without any gap. The dielectric 12 disposed between the electrodes is polarized by the electric field applied between the electrodes and exhibits a multi-electrode effect, whereby the mixed liquid passing through the mixed liquid passage space formed between the electrodes It is possible to efficiently neutralize the zeta potential of the impurity liquid particles.

Reference numeral 13 in the figure denotes an interface detection sensor disposed at a predetermined height position in the separated liquid storage space 9. For example, the interface between the two liquids can be detected by detecting a difference in conductivity between the two liquids or a difference in specific gravity. Is to detect that it has reached a predetermined height position. In the figure, 14 is a residual liquid drainage port for draining the oil-water mixed liquid remaining in the mixed liquid passage space 5 when the operation of this device is stopped, and is closed by a lid 15 while the device is operating. There is.

In order to use the two-liquid separating device constructed in this way, for example, as shown in FIG.
16 is connected to the separated liquid discharge port 8 provided on the canopy of the container body A, and an upper discharge pipe 18 provided with an automatic valve 17 that opens and closes based on information from the interface detection sensor 13 is connected and Lower discharge pipe with automatic valve 19 at liquid discharge port 8
Connect 20. Then, the mixed liquid is pressed into the main body container A from the mixed liquid inlet 7 to separate the two liquids in the main body container, and the impurity liquid is recovered through the upper discharge pipe 18,
The liquid to be separated after impurities are removed through the lower discharge pipe 20 into a liquid tank 21.
The recovered liquid to be separated is again returned to the inside of the main body container through the mixed liquid inflow port 7 again to repeat the two-liquid separation process to obtain a higher-purity separated liquid.

The two-liquid separation inside such a two-liquid separation device is performed as follows. In the following examples, a case where an oil-water mixed liquid is used as a processing target will be described. However, the two-liquid mixed liquid to be processed can be similarly processed even if it is another mixed liquid as long as it has a difference in specific gravity. Needless to say.

As shown in FIG. 1 (a), first, the oil-water mixed liquid is press-fitted from the mixed liquid inlet 7 located at the lower portion of the side surface of the main body container.
Colloidal particles that form an electric double layer between the water and liquid are suspended in the oil-water mixture before press-fitting this device, and each colloidal particle repels each other due to the Coulomb force due to the zeta potential caused by the electric double layer. Are floating.

The lower end of the inner cylinder electrode 2 is fixed to the bottom plate of the main body container, and the inner space of the main body container is sandwiched by the outer space 22 and the inner space 22.
Since it is divided into two parts, the mixed liquid flowing in from the mixed liquid inlet 7 passes through the mixed liquid passage space 5 in an upward flow as shown by an arrow in FIG. Since the dielectric 12 is present in the mixed liquid passage space without a gap, the mixed liquid flowing into the mixed liquid passage space continues to pass through the inside of the dielectric 12 while passing through the mixed liquid passage space.

Since an AC voltage is applied between the outer cylinder electrode 1 and the load electrode 3 and between the inner cylinder electrode 2 and the load electrode 3, the dielectric 12 interposed between the electrodes is polarized in the electric field direction, and the mixed liquid passage space is formed. 5 is substantially the same as a state where a large number of electrodes are arranged adjacent to each other. The electric double layer is destroyed by the surface of the oil particles in the mixed liquid passing through the multi-electrode space in the upward flow corresponding to the electric charge in the space, and the oil particles are repelled and suspended. The repulsive Coulomb force due to the zeta potential disappears. As a result, the oil particles are aggregated into coarse particles due to the intermolecular attractive force, and after aggregation, they float due to the difference in specific gravity from the aqueous liquid.
The floating oil component collects in the upper layer in the separated oil storage space 9 formed in the upper part of the main body container to form an oil layer, and increases the thickness of the oil layer with the lapse of time to push down the oil / water interface position.

This drop of the height position of the oil-water interface is monitored by the interface detection sensor 13 attached to the inner surface of the main body container, and if the oil-water interface becomes lower than the set position of the detection section of the interface detection sensor 13, the interface sensor 13 A signal is sent, and based on the signal, the automatic valve 17 installed in the conduit of the upper discharge pipe 18 is opened to discharge the oil component outside the main body container.

On the other hand, the water liquid after the oil has been separated passes downward in the separated liquid flow-down space formed in the internal space 23 and is discharged to the outside of the container from the separated liquid discharge port 8 formed in the bottom of the main container. To be done. The oil-water mixture can be separated in a considerable amount by passing it through the device only once, but in order to further reduce the oil concentration in the separated water-liquid, it is discharged from the separated liquid discharge port 8 as shown in FIG. It is preferable to recirculate the water liquid into the main body container A again through the mixed liquid inlet 7 and repeat the oil-water separation step a plurality of times.

What is shown as FIG. 3 is a case where a cylindrical SS removal filter 24 is provided in the separated liquid flow-down space 6 in order to remove SS particles from the water liquid obtained by separating the oil and water. The SS removing filter 24 has a cylindrical shape and has a separated liquid flow-down hole 25 in the center, and the holding thereof is made to have the same potential as the outer cylinder electrode 1 and the inner cylinder electrode 2 in the separated liquid flow-down hole 25. The central electrode 26 is inserted, and the upper flange 27 provided on the upper end of the central electrode 26 presses the upper end of the SS removal filter and the lower electrode 28 of the ring shape is inserted under the central electrode 26. Is fixed by pressing on the bottom surface of the SS removal filter.

The lower part of the central electrode 26 is formed hollow as shown in FIG. 4B, and the inflow hole 31 is opened in the upper side surface of the hollow pipe 30 so that the water liquid passing through the SS removal filter 24 is removed. After flowing down a gap 32 between the central electrode 26 and the central electrode 26, the hollow pipe 30 is introduced from the inflow hole 31 and guided to the outside of the container.

It is preferable to use a mesh-shaped dielectric fiber made of polypropylene or the like as the SS removal filter 24 from the viewpoint of high dielectric constant and chemical resistance, but it is also possible to use other materials.

Further, the surface of the SS removal filter 24 is surrounded by the perforated plate electrode 33 having the same potential as the load electrode 3, and the separated water liquid is introduced into the SS removal filter 24 through the hole of the perforated plate electrode 33. There is. By making the surface of the SS removal filter the same potential as the load electrode 3, the surface charge of the SS removal filter 24 is increased, the zeta potential of the SS particles is neutralized, and the SS particles are agglomerated and coarsened. The SS particles coarsened by the action of the liquid flow are captured on the surface of the SS removal filter 24, and a cake layer of SS particles is formed on the filter surface. And by doing in this way, even if a filter with a large filter is used as the SS removal filter, the filter can be prevented from being clogged, and the filter life can be extended.

In addition, especially when the treatment target is factory waste liquid, etc., the separated water liquid is put on the inner surface of the SS removal filter 24 as shown in FIG.
In order to improve the BOD value (biochemical oxygen demand) and COD value (chemical oxygen consumption), the organic substance adsorption layer 34 capable of adsorbing and removing the organic substances in the aqueous liquid is provided and the filter has a two-layer structure. Is also preferable. As the adsorbent forming the organic substance adsorption layer 34, fibrous activated carbon, granular activated carbon, zeolite, or a chelate resin can be used, and particularly when a chelate resin is used, it exhibits an excellent adsorption ability for metallic dust. it can.

What is shown as FIG. 6 shows a state in which the above-mentioned two-layer structure filter is mounted in the main body container A. In the present embodiment, it is possible to remove SS particles in the water liquid after oil removal and also improve the BOD value and COD value of the water liquid at the same time. It can contribute to the prevention of environmental pollution.

As described above, the devices disclosed as FIGS. 1 to 6 target the liquid having a low specific gravity in the mixed liquid as the separation and recovery target, but those shown in FIGS. 7 to 11 show that the separation and recovery target is the liquid in the mixed liquid. It shows a device that can separate and collect both of those with a low specific gravity and those with a high specific gravity, and the features of its configuration are that it is equipped with discharge ports 35 and 36 and has a predetermined internal height. The separated liquid collection containers 37 and 38 having the interface detection sensors 39 and 40 arranged at the positions are separately provided on the upper and lower portions of the main body container A.
Each of FIGS. 7 to 11 will be described below.

As shown in FIG. 7, a tubular electrode 41 set to the same potential as the outer tubular electrode 101 is arranged at the axial center position of the main body container B which also serves as the outer tubular electrode, and the upper end of the tubular electrode 41 is opened 42. Along with the lower end protruding through the bottom of the main body container to the outside of the main body container, a porous shape that gives a potential difference to the outer cylinder electrode 101 and the tubular electrode 41 in the middle of the outer cylinder electrode 101 and the tubular electrode 41. The load electrode 43 is arranged. And the outer cylinder electrode
Mixed liquid passage space 105 formed between 101 and the porous charge electrode 43
A dielectric 112 having a net-like shape having a multi-electrode effect is arranged therein,
In addition, the SS removal filter 124 is arranged on the inner surface of the porous charged electrode 43 with a gap 44 provided between the inner surface of the porous charged electrode 43 and the surface of the tubular electrode 41.

In this embodiment, the mixed liquid flowing from the mixed liquid inlet 107 passes upward through the mixed liquid passage space 105, and at the same time, flows into the SS removing filter 124 through the holes of the porous load electrode 43, and the dielectric 112. The multi-electrode effect causes the impurity liquid particles to aggregate into coarse particles, and the SS removal filter 124 removes the SS particles in the mixed liquid. And in this process, those with a low specific gravity in the mixed liquid are floated and collected in the separated liquid collection container 39 on the upper part of the main body container, while on the other hand, in the mixed liquid when the object of separation and recovery is a heavy specific gravity in the mixed liquid. A collection container for separated liquid 40 that is provided at the bottom of the container by settling a liquid with a large specific gravity
Are to be assembled in.

When the low specific gravity separated liquid in the mixed liquid is to be collected, according to the information from the interface sensor 37 provided in the separated liquid collecting container 39, and when the high specific gravity separated liquid is to be collected, According to the information from the interface sensor 38 in the separated liquid collection container 40 provided in the lower part of the main body container, the automatic valve provided in each discharge port is opened and closed to discharge and collect the separated liquid. The separated liquid collection container may be provided only on either the upper part or the lower part of the main body container B in accordance with the specific gravity of the liquid to be separated.
If the liquid to be separated has a light specific gravity or a high specific gravity, it is possible to cope with both if it is provided on both the upper and lower parts.

The one shown in FIG. 8 uses a tubular electrode 241 having a closed upper end as a tubular electrode and having an inflow hole 45 for inflowing a liquid to be separated formed in a side portion thereof. Both electrodes are provided between the outer cylinder electrode 201 and the tubular electrode 241. The load electrode 203 having a potential difference with respect to
A mixed liquid passage space in which a dielectric 212 is arranged between 01 and the load electrode 203.
A tubular SS removal filter 224 is arranged between the load electrode 203 and the tubular electrode 241 while forming a gap 205 between the electrodes and the tubular electrode 241, and a mixed liquid inlet 207 is provided at the upper part of the main container. It is the case when it is provided in. In this case, the mixed liquid press-fitted into the main body container passes through the mixed liquid passage space 205 in a downward flow, and then the flow is turned upward at the bottom of the main body container to pass through the SS removal filter 224 to pass through the tubular electrode 241. Reaching the upper inflow hole 45, the two liquids of the mixed liquid are separated and the liquid to be separated is purified in this process, and after the liquid is separated, the liquid to be separated is passed through the inflow port 245 through the space 46 to flow down the liquid to be separated in the tubular electrode 241. It is designed to be discharged from the bottom of the main body container to the outside of the container. In this embodiment, since the passage of the mixed liquid is long, it takes time to perform the mixing process, but the two liquids can be separated and the liquid to be separated can be purified with high accuracy.

What is shown in FIG. 9 is a case where the porous plate electrode 47 having the same potential as the load electrode 203 is arranged in contact with the surface of the SS removal filter 224 in the device disclosed as FIG. SS removal filter by placing 47
In this case, it is intended that the surface charge of 224 is increased to trap the coarsened SS particles on the filter surface and form a cake layer on the filter surface.

What has been described above is the case where the tubular electrode is arranged in the center of the main body container and the SS removal filter is arranged concentrically with respect to the outer cylinder electrode, but the tubular electrode and the SS removal filter and the organic adsorbent layer are As shown in FIGS. 10 and 11, a plurality of tubular electrodes can be arranged radially around the center of the main body container.

As shown in FIG. 10, a load electrode 303 is concentrically arranged inside the main body container C, which also serves as the outer cylinder electrode 301, at a position separated by a certain distance, and the same potential as the outer cylinder electrode 301 is provided at the center of the main body container. The central electrode 48 and the load electrode
This is a case where a plurality of tubular electrodes 341 are radially arranged around the central electrode 48 in the space between 403 and the central electrode 48, and a tubular SS removal filter 324 is installed on each tubular electrode 341. The tubular electrodes 341, 341 ... Are set to the same potential as the outer cylinder electrode 301 and the central electrode 48, and the liquid to be separated discharged from the lower ends of the tubular electrodes is caused to flow down the inner space of each tubular electrode to the lower portion of the main body container C. By providing the collecting space 49 for this purpose, the liquids to be separated that have passed through the respective tubular electrodes can be collectively discharged from the bottom of the container. In this embodiment, since the plurality of SS removal filters 324, 324 ... Are radially arranged, SS
It is possible to increase the surface area of the removal filter, to treat a large amount of mixed liquid at one time, and to provide a two-liquid separating device with a purifying function with extremely high treatment efficiency.

What is shown as FIG. 11 is, in the apparatus shown in FIG. 10, a perforated plate electrode 337 having the same electric potential as the load electrode 303 is arranged in contact with each surface of the SS removal filters 324, 324, which are radially arranged. That is the case.

As described above, the two-liquid separation device shown in FIGS. 1 to 11 is a two-liquid mixing device having a specific gravity difference such as an oil-water mixed liquid, a mixed liquid of freon and water, and a mixed liquid of freon and oil. Any two liquids can be separated as long as they are liquids.

In the two-liquid separating apparatus of the present invention configured as described above, the mixed liquid can be separated into the separated liquid and the liquid to be separated simply by press-fitting the two-liquid mixed liquid into the main body container. Moreover, this device
It can also be applied to an emulsified mixed liquid that cannot be separated by a conventional baffle system or the like, and can exhibit extremely excellent separation ability.

Further, when one or both of the SS removal filter and the organic matter adsorption layer are arranged in the space where the liquid to be separated passes, the liquid to be separated after the separation of the impurity liquid can be purified by the same device.

〔The invention's effect〕

In the two-liquid separating apparatus according to the first aspect, a load electrode that gives a potential difference to both electrodes is provided between the outer cylinder electrode and the inner cylinder electrode that have the same potential, and the load electrode is provided between the outer cylinder electrode and the load electrode. Electrically insulated load electrodes are concentrically provided to form a mixed liquid passage space for circulating the two-liquid mixed liquid in an upward direction between the respective electrodes, and an upper portion of the mixed liquid passage space is provided outside the main container. Separation that has a discharge port to the top and has a volume for temporarily storing the separated liquid, and a detection unit of an interface detection sensor that monitors the position of the interface between the separated liquid and the mixed liquid is installed in the space. A liquid collecting space is formed, an automatic valve whose opening and closing is controlled by an output signal of the interface detection sensor is provided in a discharge passage communicating with the discharge port, and the mixed liquid after the impurity liquid is removed is provided inside the inner cylinder electrode. Provide a space for the mixed liquid to flow downward. It has a structure of applying a voltage capable of neutralizing the zeta potential of impurity liquid particles in the mixture between the outer tubular electrode and the inner tube electrode and the load electrode. As described above, according to the device of the present invention, the impurity liquid particles that are aggregated and coarsened by the intermolecular attractive force are levitated by the difference in specific gravity and continue to be stored until the amount becomes a predetermined amount or more in the separated liquid collection space having a sufficient volume,
During this period, the separation liquid in the separated liquid collection space is further targeted for two-liquid separation due to the difference in specific gravity, and the high-purity low-specific-gravity separated liquid is collected in the upper part of the separated liquid collection space, and the separation in the separated liquid collection space is performed. Continue to monitor the collected amount of the liquid by the interface detection sensor, and if the amount exceeds a predetermined amount, separate it by opening the automatic valve provided in the discharge passage that communicates with the discharge port opened at the top of the separated liquid collection space. Since we decided to drain the liquid,
By simply press-fitting the mixed liquid into the main body container, a highly pure low specific gravity separated liquid can be efficiently obtained without the need for manual operation, and a fully automatic and continuously operable two-liquid separating device can be obtained. . The separated liquid is discharged through the discharge passage communicating with the separated liquid collecting space, while the separated liquid is discharged from the lower part of the main body container to the outside of the container, so that the separated liquid and the separated liquid can be easily collected.

As described in claim 2, when a separate liquid collecting container is separately provided on one or both of the upper part and the lower part of the main body container, it becomes easier to collect the separated liquid. When the liquid is provided, a two-liquid separation device applicable to both cases where the liquid to be separated and recovered is one having a low specific gravity of the two-liquid mixed solution and one having a high specific gravity is provided. it can. And in this two-liquid separation device, the low specific gravity separated liquid is discharged from the separated liquid collecting container for collecting the floating separated liquid through the outlet provided at the top of the space inside the separated liquid collecting container, while the settling separated liquid is discharged. Since the discharge of the high specific gravity separated liquid from the separated liquid collecting container for collection is performed through the outlet provided at the bottom of the space inside the separated liquid collecting container, even when the separated liquid to be collected has a high specific gravity,
In addition, a high-purity separation liquid can be obtained even when the specific gravity is low.

Further, as described in claim 3, instead of the inner cylindrical electrode, a tubular electrode having a space to flow down the liquid to be separated is used, and a plurality of the tubular electrodes are arranged radially around the main body container. In this case, a large amount of mixed liquid can be processed at one time, and the processing efficiency is significantly improved.

Furthermore, when a mesh-like porous dielectric having a multi-electrode effect is interposed between the outer cylinder electrode and the load electrode without a gap, the electric field strength of each portion between the outer cylinder electrode and the load electrode can be increased, and Since the mixed liquid passing through the outer cylinder electrode and the load electrode always passes through the dielectric body, it is possible to promote the aggregation and coarsening of the impurity liquid particles.

Further, when the SS removal layer and the organic matter adsorption layer are provided at positions where the separated liquid moving toward the separated liquid flowing space passes, purification of the separated liquid after separating the impurity liquid particles is performed in the same apparatus. This makes it possible to reuse the separated liquid discharged from this device.

Furthermore, when a perforated plate electrode having the same potential as the load electrode is placed in contact with the surface of the SS removal layer or the organic matter adsorption layer, the aggregated and coarsened SS particles in the liquid to be separated are removed from the SS removal layer or the organic matter adsorption layer. The cake layer can be made to function as a filter by attracting and capturing the surface by Coulomb force and forming a cake layer of SS particles on these surfaces. Therefore, the filtration accuracy is dramatically improved and the relatively coarse SS particles are removed by the cake layer, so that clogging of the filter mesh can be prevented and the life of the device can be extended.

[Brief description of drawings]

FIG. 1 (a) is a longitudinal sectional view showing the most basic embodiment of the two-liquid separating apparatus according to the present invention, FIG. 1 (b) is a lateral sectional view in the same embodiment, and FIG. 2 is the same embodiment. FIG. 3 (a) (b) is an explanatory view showing another embodiment, FIG. 4 (a) (c) is an enlarged perspective view of an essential part of the same embodiment, FIG. FIG. 4 (B) is an enlarged vertical sectional view of an essential part in the same embodiment, FIG. 5 is an enlarged vertical sectional view of an essential part of another embodiment, FIG. 6 (A) (B), FIG. 7 (A) ( B), Fig. 8 (a)
(B), FIG. 9 (a) (b), FIG. 10 (a) (b),
11 (a) and (b) show another embodiment. A: container body, 1: outer cylinder electrode, 2: inner cylinder electrode, 3: charge electrode, 4: holding insulator, 5: mixed liquid passage space, 6: separated liquid flow-down space, 7: mixed liquid inlet, 8: Separation liquid discharge port, 9: Separation liquid storage space, 10: Separation liquid discharge port, 11: Power supply device, 12: Dielectric material, 13: Interface detection sensor, 14: Residual liquid discharge port, 15: Lid, 16 : Inlet pipe, 17: Automatic valve, 18: Upper discharge pipe, 19: Automatic valve, 20: Lower discharge pipe, 21: Liquid tank, 22: External space, 23: Internal space, 24: SS removal filter, 25: Covered Separated liquid downflow hole, 26: central electrode, 27: upper flange, 28: lower flange, 29: push spring, 30: hollow pipe, 31: inflow hole, 32: gap, 33: perforated plate electrode, 34: organic matter adsorption layer , 35: outlet, 36: outlet, 37: interface detection sensor, 38: interface detection sensor, 39: separated liquid collection container, 40: separated liquid collection container, 41: tubular electrode, 42: opening, 43: porous Load electrode, 44: gap, 45: inflow hole, 46: flow space for liquid to be separated, 47: perforated plate electrode , 48: center electrode, 49: set space.

Claims (9)

[Claims] 1. An outer cylinder electrode also serving as a main body container, and an inner cylinder electrode arranged concentrically with respect to the outer cylinder electrode and set to the same potential as the outer cylinder electrode, the outer cylinder electrode and the inner cylinder. A load electrode electrically insulated from the electrodes is concentrically provided, and a mixed solution passage space for passing the two-liquid mixed solution upward is formed between the electrodes, and a main body is provided above the mixed solution passage space. It has a discharge port to the outside of the container at the top and has a capacity to temporarily store the separated liquid, and a detection unit of an interface detection sensor for monitoring the interface position between the separated liquid and the mixed liquid is installed in the space. A separated liquid collecting space is formed, and an automatic valve whose opening and closing is controlled by an output signal of the interface detection sensor is provided in a discharge passage communicating with the discharge port, and inside the inner cylinder electrode after the impurity liquid is removed. Liquid mixture flow that draws liquid mixture downward It is provided space, formed by applying a voltage capable of neutralizing the zeta potential of impurity liquid particles in the mixture between the outer tubular electrode and the inner tube electrode and the load electrode two-liquid separator. 2. A tubular shape having the same potential as the outer cylinder electrode inside the outer cylinder electrode also serving as the main body container, and having therein a mixed liquid flow-down passage for guiding the mixed liquid after removing the impurity liquid. The electrodes are arranged concentrically, and a load electrode electrically insulated from both electrodes is concentrically provided between the outer cylinder electrode and the tubular electrode, and the two-liquid mixed liquid is placed in the height direction between the electrodes. Has a volume for temporarily storing the separated or floated separated liquid in one or both of the upper part and the lower part of the main body container that forms a mixed liquid passage space to be circulated in the space, and the interface position between the separated liquid and the mixed liquid in the space. If a separation liquid collection container for collecting the floating separation liquid or for collecting the sedimentation separation liquid is installed in series, and if it is a separation liquid collection container for collecting the floating separation liquid, An outlet is provided at the top of the space inside the container. On the other hand, if it is a separation liquid collection container for sedimentation separation liquid, a discharge port is provided at the bottom of the space inside the container, and the interface for detecting the interface provided in the separation liquid collection container in the discharge passage communicating with these discharge ports. An automatic valve whose opening and closing is controlled by the output signal of the sensor is installed, and a voltage that can neutralize the zeta potential of the impurity liquid particles in the mixed liquid is applied between the outer cylinder electrode and the tubular electrode and the load electrode. Separation device. 3. A plurality of mixed liquid flow-down spaces are formed inside the outer cylinder electrode which also serves as the main body container, to have the same potential as the outer cylinder electrode and to guide the mixed liquid after the removal of the impurity liquid in the inside thereof. The tubular electrodes are arranged radially, and a load electrode electrically insulated from both electrodes is provided in the middle of the outer cylinder electrode and the tubular electrode concentrically with respect to the outer cylinder electrode, and two electrodes are provided between the electrodes. It forms a mixed liquid passage space that allows the liquid mixed liquid to flow in the height direction, and has a volume for temporarily storing the separated or floated separated liquid in one or both of the upper part and the lower part of the main container, and the space is separated. A separation liquid collection container for collecting the floating separation liquid or for collecting the sedimentation separation liquid, in which the detection part of the interface detection sensor for monitoring the interface position between the liquid and the mixed liquid is installed,
And, if it is a separation liquid collection container for floating separation liquid collection, an outlet is provided at the top of the interior space of the container, while if it is a separation liquid collection container for sedimentation separation liquid, the interior space of the container. Outlets are provided at the bottom of the outlet, and an automatic valve whose opening and closing is controlled by the output signal of the interface detection sensor provided in the separated liquid collection container is provided in the outlet passage communicating with these outlets. A two-liquid separating apparatus in which a zircon potential of impurity liquid particles in a mixed liquid is applied between an electrode and a load electrode to apply a cell voltage. 4. The two-liquid separating apparatus according to claim 1, 2 or 3, wherein an oil-water mixed liquid is used as a processing target, using an alternating voltage of 1 to 10 V / cm as a charging voltage. 5. The two liquids as set forth in claim 1, 2 or 3, wherein an emulsified oil-water mixed liquid is used as a treatment target, using an alternating voltage of 10 to 50 V / cm as a charging voltage. Separation device. 6. The method according to claim 1, 2 or 3, wherein an AC or DC voltage of 100 to 200 V / cm is used as a charging voltage, and a mixed liquid having a low induction rate is treated. Two-liquid separator. 7. The method according to claim 1, wherein a porous dielectric having a multi-electrode effect is interposed between the outer cylinder electrode and the load electrode without any gap. Liquid separator. 8. The two-part liquid according to claim 1, wherein the SS removal layer and / or the organic substance adsorption layer is provided in the space through which the mixed liquid after the removal of the impurity liquid passes. Separation device. 9. The invention according to claim 1, wherein a porous plate electrode having the same potential as the load electrode is provided in contact with the surface of the SS removal layer or the organic substance adsorption layer. The two-liquid separation device according to the item.