JPS6031810A - Electrostatic filter apparatus - Google Patents

Abstract

PURPOSE:To directly take out treated water containing almost no impurities such as a solvent or a gummy substance by forming the side wall of a filter tank into a double wall, and forming a pocket between the inner and outer walls of said double wall while arranging a barrier plate in said pocket. CONSTITUTION:A liquid to be treated is introduced into a filter tank 1 filled with a solvent 5 up to a liquid level 19 from an introducing port 3 and the introduced liquid to be treated rises through an electrostatic separation part consisting of a cathode 7 and an anode 6 while converted to small liquid droplets by a distributing plate 4. Herein, the oil component in the liquid to be treated is dissolved in the solvent 5 and impurities such as a solid components is also separated while float impurities form an intermediate layer and moisture forms a water layer 21 above said intermediate layer. These layers are flooded to a pocket 14 from the upper edge of an inner side wall 13 but impurities are precipitated into the pocket 14 by the barrier plate 15 and moisture is forms a water layer between an outer side wall 12 and the barrier plate 15 as clean supernatant water which is, in turn, taken out from a discharge port 27 through a trough 16.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention This invention relates to an improvement in an electrostatic filtration device that utilizes an induced electrostatic field in an electrically insulating solvent solution.

Prior Art Prior to this application, the present inventor had invented a filtration device for sewage or waste liquid that utilizes an induced electrostatic field in an electrically insulating solvent solution.
Publication, Special Publication No. 51-3941, Special Publication No. 51-394
This method is disclosed in Japanese Patent Publication No. 2 and Japanese Patent Publication No. 51-23742.

These devices provide a tank containing an electrically insulating solvent solution with an inlet for introducing the liquid to be treated and an outlet for discharging the treated liquid. At the same time, a pair of electrodes is arranged in the solvent solution inside the tank, and a high-voltage DC voltage is applied between the electrodes, which is introduced from the inlet of the liquid to be treated. The organic substance contained in the liquid to be treated is dissolved in the solvent solution by the action of the electrostatic field formed by the pair of electrodes, and the floating impurities in the intermediate layer formed on the upper surface of the solvent solution layer are dissolved into the floating impurities. The treated liquid layer is discharged from the discharge port, and the treated water in the treated liquid layer formed on the upper surface of the intermediate layer is discharged from the treated liquid outlet.

With this type of conventional electrostatic filtration device, wastewater or waste water can be treated very efficiently and treated water with low impurity content can be discharged, but the gases dissolved in the treated liquid can be discharged. When separated and floated in an electrostatic field, the contamination of gum and solvent particles that are insoluble in both solvent and water is unavoidable. Often requires further processing.

Note that regulations regarding the organic substance content of wastewater have become increasingly strict in recent years.

OBJECTS OF THE INVENTION An object of the present invention is to provide an electrostatic filtration device that can directly take out treated water that contains almost no impurities such as solvents or gums.

Structure and Effects of the Invention The apparatus of the present invention provides a tank containing an electrically insulating solvent solution with an inlet for introducing the liquid to be treated, and a pair of electrodes arranged in the solvent solution inside the tank. In this electrostatic filtration device in which a high DC voltage is applied between the electrodes, the side wall of the tank is made into a double wall, a pocket is formed between the inner wall and the outer wall, and a pocket is formed between the inner wall and the outer wall. The upper edge is formed above the liquid level of the solvent solution, so that suspended impurities in the intermediate layer formed on the upper surface of the solvent solution layer bathe out from the upper edge of the inner wall into the pocket. A vertical jamb board that is continuous in all directions is placed between the inner wall and the outside wall, and a gutter that is continuous in all directions is provided on the outside and inside of this board.

The upper end of the jama board is located above the upper edge of the inner wall, and the lower end is located at the same level as or slightly below the upper edge of the inner wall, and the gutter has an opening at the same height. , its mouth is located below the upper ends of the jamb and the outer wall and above the upper edge of the inner wall. .

In other words, in the present invention, the presence of the jam plate prevents the solvent and gum that float up with the gas dissolved in the liquid to be processed from flowing out to the pocket side, and collects them in the gutter located inside the jam plate. The purpose is to collect clean water without any impurities in the gutter outside the jama board.

In addition, in the present invention, it is preferable that the gutter located inside the jama plate be provided near the jama plate, and it is also preferable to provide a planar porous rectifier plate inside the inner wall of the tank near the upper edge of the inner wall. . The former allows the floating impurities to be completely prevented from flowing out of the friction plate, and the latter allows the floating of the impurities to be more effectively suppressed.

The gutter outside the jama plate may be branched to increase the amount of treated water or fresh water discharged, or a plurality of gutter may be provided.

Next, the present invention will be explained in more detail according to an example shown in the drawings.

In FIG. 1, (1) is a filtration tank, and (2) is a filter medium that is an inlet for a solvent solution, which is opened at the bottom of the tank (1). (3) is an inlet for the treated (filtered) liquid installed at an appropriate height in the center of the bottom of the tank (1). It has a small diameter hole, and above it a water regulating plate (4) having a large number of microholes is arranged. (5) is a solvent solution layer. A pair of electrodes (7) consisting of an anode (6) and a cathode (7) are arranged in the solvent solution, and are located in the center of the anode blood tank (1) and connected to a high voltage power source. On the other hand, the anode (6) faces the cathode (7) on the outside thereof and is grounded. More specifically, the cathode (7) has a 7-shaped cross section and has a pair of left and right flat inclined outer surfaces (8) extending in the above direction, while the anode (6) has a 7-shaped cross section. The anode (7) has a pair of left and right flat sloped surfaces (9) which are arranged at an appropriate interval to prevent spark discharge from occurring and which face the sloped outer surface (8) of the cathode (7), respectively. An opening larger than the treated liquid inlet (3) is formed between the lower edges of the inclined inner surface (9) of 6). This anode (6) is fixed to a tank lid (not shown) via an anode suspension member (not shown).

The inclined inner surface (9) of the anode (6) and the inclined outer surface (
8) have an appropriate spacing that does not cause spark discharge, and form a pair of left and right contact zones (10) extending in the front-rear direction between them.

The cathode (7) is connected to the high voltage conductive wire 01),
It is mechanically supported by a support tube (b) containing the conductive wire (11).

The side wall of the tank (1) is a double wall, and a pocket 0→ is formed between the outer wall (b) and the inner wall 03). Pocket 04) is divided at the bottom to facilitate removal of impurities accumulated inside, and is tapered at the four corners of tank (1). Above the tank (1), on the inner wall (
A vertical jamb plate θ5) is provided between the jamb plate (13) and the outer wall 02), and two gutters Oa) and (17) are arranged on the inside and outside of this jamb plate (15). ing. (See Figures 2 and 3).

The upper edge (]8) of the inner wall 03) is formed above the liquid level 09) of the solvent solution layer (5), and
The supernatant liquid (in the intermediate layer formed on the upper surface) overflows into the pocket 0 → with floating impurities that have sedimentation properties, and the jam plate (15) is formed between the inner wall 03) and the outer side. wall(
It extends upward from almost the same height as the upper edge of the inner wall (13) between the inner wall (13), and the gum and solvent that floated up with the gas overflow into the pocket 0 →. The treated liquid layer, that is, the water layer (2) inside the jama plate 05)
1) Regulate the inside to rise.

The gutters (16) and (17) are located at the upper edge of the inner wall (13) (]
8) above the upper end of the jama plate (15)) and the outer wall (b) so as to have respective openings or upper edges at the same height below the upper edge (c) of the outside wall (b); This gutter (
16) The liquid level of the processing solution is regulated by (17). Floating impurities that have risen in the water layer (21) flow together with the treated liquid into the gutter (17) inside the jam plate 05). The treated liquid discharged from the gutter (17) may be sent to the electrostatic filtration device again for treatment. Only the supernatant liquid of the treated liquid overflowing into the pocket 04) flows into the gutter 06) on the outside of the jama plate 05), so the treated liquid discharged from the gutter θ6) is almost pure water and is directly The water can be drained and can also be used as industrial water.

In addition, there is a planar porous rectifying plate (c) near the inner wall 03) and upper edge 08) inside the tank (1), which limits the rise of floating impurities in the middle layer) and improves the treatment effect. is enhanced.

Next, a method for electrostatic treatment of factory waste liquid using the above device will be briefly explained.

First, a solvent that is electrically insulating or dielectric and has a higher specific gravity than water, such as chloroethylene, flows into the filtration tank (1) from the inlet (2) and is filled to a certain level (10). .

Next, a negative DC high voltage is applied to the cathode (7). In addition, in the present invention, the inner electrode can be used as an anode and the outer electrode can be used as a cathode. In this case, the electrode (7) is an anode, and a DC plus high voltage is applied thereto.

After being prepared in this way, the liquid to be treated, preferably the liquid to be treated which has been mixed with the solvent, i.e. perchlorethylene, filled in the tank and made into an emulsion, is introduced into the tank (1) from the inlet (3). The speed of the liquid to be treated that is introduced into the inlet (3) decreases rapidly, and the liquid is turned into small droplets by the outer circumferential surface of the inlet (3), which has many small diameter holes, and furthermore, a large number of minute droplets are formed above the inlet (3). A gently mountain-shaped water regulating plate with holes drilled in it allows the droplets to become smaller and reach the cathode (
7) rises toward the center due to the difference in specific gravity.

The negatively charged droplets in contact with the slope (8) of the cathode (7) are attracted toward the anode (8) at high speed by the action of the electrostatic field, and the droplets that reach the slope (9) of the anode are in turn It becomes positively charged and scatters toward the cathode (7) again. The droplet has both poles (6).

During the reciprocating flight between (7) and 5), the oil contained in the liquid to be treated is dissolved in the solvent solution (5), solids and other impurities are also separated from the water, and the liquid rises at a slow rate to become solid. Contaminants and other floating impurities form an intermediate layer ), and water forms an aqueous layer 0◇ above it.

There is a porous rectifying plate (c) on the upper surface of the middle layer (03), which suppresses impurities from rising into the water layer, and the impurities pass through the turbulent flow from the upper edge (18) of the inner wall (03). Efficiently bathe into pocket θ→ without waking it up. In addition, even if impurities such as solvent particles float through the porous rectifying plate e4, they will not flow into the water layer (into the water layer on the outside) and will flow into the inner gutter. (17) and is taken out from the outlet (c).

The liquid to be treated that has leaked from the upper edge (18) of the inner wall (18) into the pocket θ→ does not spread laterally due to the presence of the jamb plate 05), but rather spreads along the outer surface of the inner wall (13). Due to the downward flow, floating impurities contained in the liquid to be treated efficiently settle inside the pocket (04), and water is separated in a pure state to the upper layer, which is transferred to the outer wall (2) as a clean supernatant liquid.
A water layer) is formed between the and the jama plate 05). Water layer (c)
The water flows into the gutter 06) and is removed from the outlet).

The treated liquid taken out from the outlet (c) through the inner gutter 0η is reprocessed by being introduced into the electrostatic filtration device again to remove impurities such as solvents.
The water layer taken out from the outlet (c) through the drain port (c) contains almost no impurities, and there is no problem in draining it as is, and it can be directly reused as industrial water.

Note that the impurities stored in pocket 04) are quickly sedimented and concentrated because pocket 0→ is formed with a tapered tip, and are taken out from the outlet at the lower end of pocket 0→. Furthermore, in the device of the present invention, the inner surface of the inner wall (13) of the tank (1) and the surface of the electrode suspension member are made of an insulating material such as polyvinyl chloride or Teflon, thereby enhancing the electrostatic filtration effect. can be increased.

[Brief explanation of the drawing]

FIG. 1 is a sectional view showing an example of the device of the present invention, and FIG.
1 is a side view of the device shown in FIG. 1, and FIG. 3 is a plan view showing the device shown in FIG. 1 with the porous rectifying plate removed. (1)－・・・・・・・・・・・・・・・Tank (6)・・・・
・・・・・・・・・・・・Anode (7) ・・・・・・
・・・・・・−・Cathode (12) ・・・・・・・・・・
...Outside wall 03) ...
Inner wall (14) ・・・・・・・・・・・・・・・Pocket (15) ・・・・・・−・・・・・・・・・・・・Jama board (1
a), (17) “”-””・Gutter 0I), ni)...
・ - ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・ ・Display 1985 Patent No. 13! ;1959
No. 2, Title of the invention Electrostatic filtration device 3, Relationship with the case of the person making the amendment Patent applicant 6, Number of inventions to be increased by the amendment (1) Amend the description and scope of claims as attached. do. 12) The same book, page 13, line 7, it says ``outlet'', but ``
Output port + 28) Correct as J. 2. Scope of Claims (1) A tank containing an electrically insulating solvent solution is provided with an inlet for introducing the liquid to be treated, a pair of electrodes is arranged in the solvent solution inside the tank, and the electrode In an electrostatic filtration device in which a high DC voltage is applied between the tank, the side wall of the tank is made into a double wall, a pocket is formed between the inner wall and the outer wall, and the upper edge of the inner wall is shaped above the melting surface of the solvent solution, so that floating impurities in the intermediate layer formed on the upper surface of the solvent solution layer bathe out from the upper edge of the inner wall to the l kerato. Between the inner wall and the outer wall, there is a vertical Ojama board that is continuous in all four directions, and the upper end of this jama board is above the upper edge of the inner wall. An electrostatic oil filtration device characterized in that the heights of the mouths of these gutters are the same and are located below the upper ends of the jam plate and the outer wall and above the upper edge of the inner wall. (2) The device according to claim 1, wherein a planar porous rectifying plate is provided inside the inner wall near the upper edge of the inner wall. (11) Claim 1 in which the outer gutter is separated
The device according to paragraph 2 or paragraph 2. (4) The device according to any one of claims 1 to 3, wherein the pocket is divided at the bottom and tapered at the tip. (5) The device according to any one of claims 1 to 4, wherein the inner surface of the inner wall and the surface of the electrode suspension member are formed of an insulating material.

Claims (5)

[Claims] (1) A tank containing an electrically insulating solvent solution is provided with an inlet for introducing the liquid to be treated, a pair of electrodes are arranged inside the tank in the solvent solution, and a high-voltage DC voltage is applied between the electrodes. In the electrostatic filtration device, the side wall of the tank is made into a double wall, a pocket is formed between the inner wall and the outer wall, and the upper edge of the inner wall is formed to absorb the solvent of the solvent solution. The intermediate layer is formed above the surface of the solvent solution layer so that floating impurities in the intermediate layer formed on the upper surface of the solvent solution layer are bathed from the upper edge of the inner wall into the pocket, and the intermediate layer is formed above the inner wall and the outer wall. In between, there is a vertical jama board that is continuous on all four sides, and the upper end of this jama board is located above the upper edge of the inner wall, and the lower end is located at the same level as or slightly below the upper edge of the inner wall. Furthermore, there are continuous gutters in all four directions on the outside and inside of the above-mentioned jama board, and the mouths of these gutters are at the same height, and the inside wall is located below the upper end of the jama board and the outside wall. An electrostatic filtration device characterized by being located above the upper edge. (2) The device according to claim 1, wherein a planar porous rectifying plate is provided inside the inner wall near the upper edge of the inner wall. (3) The device according to claim 1 or 2, wherein the outer gutter is branched. (4) The device according to any one of claims 1 to 3, wherein the pocket is divided at the bottom and tapered at the tip. (5) The device according to any one of claims 1 to 4, wherein the inner surface of the inner wall and the surface of the electrode suspension member are formed of an insulating material.