JPH06343971A - Alternative current electrolytic flocculation apparatus - Google Patents

Abstract

PURPOSE:To neutralize electric charges of a colloidal component and a suspended component dispersed in a liq. with a polyvalent ion of positive charge, aggromelate them by the actions of crosslinking of an insoluble hydroxide and van der Waals force, associate the aggromelation by means of floating and stirring forces of hydrogen and oxygen bubbles and separate and remove them with a high accuracy by means of a simple filtering and adsorption material. CONSTITUTION:A cathode cylinder 3 of a physically and chemically stable graphite and an aluminum or iron anode cylinder 4 producing ions with positive charge having both actions of neutralization of electric charge and crosslinking are arranged on an insulation ring 6 with an opening 5 for a stored soln. in a liq. tank 1. It is possible thereby to flocculate fine particles in city water, waste water, cutting liq. and washing liq. for a machine and to make filtering and adsorption easy.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION The present invention relates to suspensions, colloidal components contained in tap water, sewage, etc., oils and sludges in water-based cleaning fluids, and emulsion oils and fine particles in water-soluble cutting fluids. Positively charged polyvalent ions from the anode that disperse into the anode and cause impurities to cause problems such as stirring force by hydrogen and oxygen bubbles generated by electrolysis, charge neutralization of colloidal particles, and sometimes cross-linking, soluble polymer The present invention relates to AC electrolytic coagulation in which flocculation and flotation are facilitated by ionic and insoluble hydroxide to facilitate separation by filtration.

[0002]

2. Description of the Related Art Conventionally, solid-liquid separation in water and sewage has been problematic because it requires a vast facility area and a long processing time.
Further, there is no simple means for effectively removing oil and sludge that have been emulsified and suspended in the water-based cleaning liquid and can be circulated for use.
Further, there is no means for separating and removing cutting oil from waste liquid of cutting fluid containing emulsified oil, which is commonly called "emulsion", and discharging only water as it is. Furthermore, there is no one that can effectively and quickly separate and remove white turbidity, emulsified oil content, sludge that diffuses and suspends when mixed in a cleaning liquid used in a water-based cleaning machine, and only water can be discharged as it is.

Therefore, the applicant of the present invention compresses and fills an anti-hair-finished product such as a non-woven fabric made of a chemically synthetic fiber having no water-absorbing property such as polypropylene or polyethylene, and the oil film on the liquid surface or the emulsified oil component is dispersed. It was proposed to remove and separate the fine particles that are present. However, unlike the coarse suspension, the oil and particles that have been made finer to the colloidal region have a problem that they cannot be filtered and adsorbed as they are.

[0004]

That is, the AC electrolytic coagulation apparatus of the present invention is provided with an electrolytic device constituted by a material for generating positively charged polyvalent ions at both electrodes in a liquid tank such as a washing machine. , The positively charged ions from the anode neutralize the negatively charged colloidal components dispersed in the electrolyte solution, enabling the aggregation and flocculation by the force of Van der Waals, and the hydrogen from both electrodes, By generating levitation convection in the entire liquid tank by oxygen bubbles, for example, micro flocs of several tens of microns collide with each other and agglomerate to several hundreds of microns or more, and high-precision solid-liquid separation is achieved even by simple filtration and adsorption. The feature is the feature.

The present invention is a material which has conductivity in both electrodes in a liquid tank incorporated in equipment such as clean water, sewage treatment, and a washing machine, and a system, and which generates positively charged polyvalent ions when electrolyzing. Electrolytic flocculation device which is composed of the following components and is capable of forming a floc by neutralizing the negative charges of the colloidal component and the suspension component to be removed in the electrolyte solution and binding them by Van der Waals force. Is provided.

Another object of the present invention is to use aluminum, iron, copper, zinc or the like for both electrodes to obtain a positively charged hydroxide polymer multivalent ion that works most effectively for charge neutralization. It is intended to provide an electrolytic coagulation device that can be used.

Another object of the present invention is to:
It is intended to provide an electrolytic coagulation device capable of reinforcing floc formation by using a material having a cross-linking action at the same time as charge neutralization such as aluminum and iron for both electrodes.

Still another object of the present invention is to make both poles a cylinder and to form an outer cylinder which becomes either pole in order to effectively and quickly effect the agglomeration of microflocs by a strong floating upstream. A replenishment port from the liquid tank is opened in the lower part, and a plurality of poles that allow circulation of the pole inside the inner cylinder are opened in the inner cylinder which is the opposite electrode facing each other, all around the submerged inside. The oil is floated and agglomerated by the floating gas upstream from the opposite electrodes of the outer cylinder in the case where the outer cylinder is installed in close proximity, and the floc of particles is further aggregated by the charge neutralization of positively charged ions from the anode. It is intended to provide an electrolytic coagulation device that can be used.

[0009]

That is, in the AC electrolytic coagulation apparatus of the present invention, in a liquid tank in which colloid, particles with a suspension diameter, and oil are dispersed, both electrodes are conductive and a large amount of positive charge is applied when electricity is applied. It is composed of materials that generate valent ions, soluble polymer ions, insoluble hydroxides, neutralize the charge of the dispersed components, and can perform coagulation and crosslinking at the same time. Aggregate the removed substances dispersed in the liquid tank. It is characterized in that it can be easily disassembled.

[0010]

Next, the electrolytic coagulation apparatus of the present invention will be described in detail with reference to the following examples.

Reference numeral 1 in the drawing is a perspective sectional view showing the structure of an AC electrolytic aggregating apparatus in which aluminum is used as a material for the both electrodes in a liquid tank, each of which is molded and installed in a cylinder.

In FIG. 1, the liquid tank 1 is constructed by cutting a PVC pipe, which is an insulator, into slices, and also by welding a PVC plate to the insulating plate 2 at the bottom. The outer cylinder 3 of the aluminum electrode and the inner cylinder 4 of the aluminum electrode were used as electrodes. An insulating ring 6 having a replenishing liquid opening 5 is provided below the aluminum electrode outer cylinder 3 to form an insulating plate 2 that constitutes the bottom of the liquid tank 1.
It is insulated from the aluminum bottom plate electrode 7 having a full inner diameter placed on top. On the other hand, the inner cylinder 4 of the aluminum electrode is provided with a flange 8 of a conductor, which has a wall thickness that is in full contact with the aluminum bottom plate electrode 7 and is fitted into the inner diameter of the insulating ring 6, and is connected to the aluminum bottom plate electrode with a bolt or the like not shown. It is fixed at 7. A large number of circulation openings 9 are provided on the entire circumference of the aluminum electrode inner cylinder 4 to facilitate circulation of the liquid in the aluminum electrode inner cylinder 4 to the inside of the aluminum electrode outer cylinder 3. At the outer peripheral portion of the liquid tank 1, a stock solution inlet 10 from another device (not shown),
The cleaning liquid discharge port 11 and the scum discharge port 13 of the scum 12 that has flocculated and floated are provided. The gantry 14 is for height determination in order to define electrical insulation from the installation surface.

Next, the agglomeration principle of this apparatus will be described with reference to the schematic view of FIG. 2. If one end of an AC power source is connected to the aluminum bottom plate electrode 7, the aluminum electrode inner cylinder 4 which is attached in contact with this is connected. Becomes a conducting electrode 15 via the flange 8. Another electrode 17 is connected to the outer aluminum electrode outer cylinder 3 from outside the liquid surface 16. When electrolyzing and electrolyzing in a liquid in which colloidal components, suspension components, and the like (not shown) are dispersed, the aluminum electrode cylinders 3, 4, the aluminum bottom electrode 7, and the flange 8 cause simple trivalent in a strongly acidic state. Ion (Al 3+) 18a, pH 4 ~
In the vicinity of 5, it binds to hydroxide ion (OH-) in water and is a positively charged soluble polymer ion [Al8 (OH) 4 + / 20] 18.
b is generated, which normally has the effect of neutralizing the charge of the negatively charged colloid and the suspension component. As a result, the particles are
It becomes possible to combine by the power of Der Vars. Furthermore, hydroxides such as aluminum and iron have a cross-linking action to further enhance the bond by van der Waals, and are effective materials. Furthermore, by energizing, the minute bubbles of hydrogen gas and oxygen gas from the oppositely facing surfaces of the electrodes become an upward flow from the bottom side, not only floating the flocs, but also causing repeated agglomeration of the agglomerated particles to agglomerate. Produces a complex effect that significantly advances.

Explaining in detail the principle of AC electrolytic aggregation in FIG. 2, it is assumed that the outer cylinder 3 of the aluminum electrode is the negative pole and the inner cylinder 4 of the aluminum electrode is the positive pole in a moment when the positive and negative transitions occur. And electrolysis produces positively charged multiply charged ions of aluminum (Al 3+) 18a or polymer ions [Al 8 (OH) 4 + / 20] 18b,
Charge neutralization of dispersed particles (not shown), and at the same time, as the hydrogen gas 19 and oxygen gas 20 generated from the pole surface rise, the particles whose surface potential is near the isoelectric point flock and aggregate. Surfaced and became scum 12. Hang up,
A fresh new stock solution is introduced from the replenisher opening 5, and the same steps are performed. In the illustrated embodiment, the aluminum electrode outer cylinder 3 has a diameter of 120 mm, and the aluminum electrode inner cylinder 4 has a diameter of 100 mm. An infinite number of circulation openings 9 having a diameter of 3 mm are provided. In addition, the size of the electrolyzer becomes larger,
If the amount of gas generated increases, there is a danger of explosion. Therefore, it is necessary to dilute the gas with a large amount of air so that the concentration is below the danger point, and to completely discharge it to the outside with a duct. In the actual AC electrolysis, the current value changes depending on the degree of electrolysis of the sample. In the test, the voltage value was determined by the sample, but the current value was within the range of 10 A / dm ² . The waste liquid containing the common cleaning agent and colloidal components used in water-based cleaners has a high degree of electrolysis, so the maximum current can be passed, and the liquid level rises from the confronting surface of both electrodes. After several seconds, hydrogen bubbles were generated, and after a few seconds, it was confirmed that scum aggregated in millimeters suddenly soared and floated on the water surface. During that time, countless flocs were also confirmed which were stirred in the bubbles.

FIG. 3 shows aluminum plates 21 and 2 on both electrodes.
No. 2 is used, and a gap serving as a passage for the liquid is provided in the lower portion, and both electrodes are arranged at the same height as the housing 23 so as to overflow the scum in the upper portion.

Next, according to the embodiment shown in FIG. 1, the washing waste liquid in the steel mill was actually subjected to AC electrolytic coagulation, and after being filtered with two 1 mm thick polypropylene filter cloths,
BOD and COD are 2 of JIS KO102 respectively
1. The analysis was carried out according to JIS KO102-17. Table 1 is based on this example, and is considerably lower than the result of the direct current treatment of the same liquid in Table 2 given as a reference, but it is judged to be practical.

[0017]

[Table 1]

[0018]

[Table 2]

[0019]

As described above, according to the present invention, it has a physically and chemically stable and electrically conductive property.
It is composed of a material that produces positively charged multiply charged ions during electrolysis. By electrolysis, positively charged ions are generated to neutralize the negatively charged colloids and suspension components, and disperse particles into van der vars. Has the practical benefit of being able to aggregate by the force of.

Further, according to the present invention, by using aluminum, iron, copper, zinc or the like as the bipolar material, positively charged hydroxide polymer polyvalent ions are generated to effectively neutralize the charge of the negatively charged particles. Have the real benefit of being able to act on.

Furthermore, according to the present invention, both electrodes are made of a material capable of simultaneously performing charge neutralization and cross-linking during electrolysis, such as aluminum and iron, to reinforce the van der Waals coupling, and to block flocs. There is a real benefit that can promote

Furthermore, according to the present invention, the strong floating force of the fine bubbles of hydrogen and oxygen from the surface where the two electrodes directly face each other can stir the microflocs and promote the agglomeration. .

Furthermore, according to the present invention, an opening is provided in the lower portion of the outer cylindrical electrode, and the replenishing stock solution can be easily guided by the floating upstream, so that convection of the entire liquid tank is possible.

By providing the inner cylindrical electrode with a large number of circulation openings for the inner liquid, the inner cylinder side liquid can be condensed smoothly.

[Brief description of drawings]

FIG. 1 is a perspective cross-sectional view including a partial cross-section for explaining an electrolytic aggregating apparatus of the present invention.

FIG. 2 is a schematic cross-sectional view illustrating aggregation and agglomeration of the present invention.

FIG. 3 is a perspective view including a partial cross-sectional view showing an embodiment using a flat plate for each of a cathode and an anode.

[Explanation of symbols]

 1. Liquid tank 2. Insulation plate 3. Aluminum inner electrode cylinder 4. Aluminum outer electrode cylinder 5. Replenisher opening 6. Insulation ring 7. Aluminum bottom plate electrode 8. Flange 9. Circulation opening 10. Stock solution inlet 11. Purification liquid outlet 12. Scum 13. Scum outlet 14. Stand 15. Conducting electrode 16. Liquid level 17. Separate poles 18a, 18b Positively charged ions 19. Hydrogen gas 20. Oxygen gas 21.22 Aluminum flat plate 23. housing

Claims (2)

[Claims] 1. A negatively charged colloid that produces positively charged ions and soluble polymer ions during electrolysis and disperses in a liquid,
Aluminium, iron, etc., which can neutralize the suspension components by charge and crosslink, aggregate, and agglomerate by the hydroxide produced at the same time, are used as electrodes, and the colloid and suspension components are also aggregated by applying an alternating current. An AC electrolysis flocculation device characterized by facilitating solid-liquid separation. 2. The AC electrolytic aggregating apparatus according to claim 1, wherein both electrodes are formed of the same material.