KR102345122B1 - A waste water treatment device implementing an electrolysis of waste water and applying a different waste treatment method in a different treatment bath depending on a property of or a condition of treatment water after an electrolysis of waste water - Google Patents

Abstract

The present invention relates to a wastewater treatment device in which different wastewater treatment methods are applied in different treatment tanks for each property of wastewater electrolysis and post-electrolysis treatment. The present invention includes a water collection tank, a PH control tank, a flow rate control tank, an electrooxidation tank, a microbubble mixing tank, a pressurized flotation tank, a settling tank, a concentration tank, a dehydrator, and a discharge tank. The present invention eliminates colloidal particles.

Description

A waste water treatment device implementing an electrolysis of waste water and applying a different waste treatment method in a different treatment bath depending on a property of or a condition of treatment water after an electrolysis of waste water}

The present invention includes a water collecting tank 10 for collecting the inflowing wastewater; a PH adjusting tank 20 for adjusting the PH by introducing wastewater collected for a certain period of time from the water collecting tank 10, injecting caustic soda, and injecting an electrolyte from the salt dissolving tank; a flow rate control tank 30 for maintaining constant PH and electrical conductivity of the wastewater introduced from the pH control tank 20; an electrooxidation tank 40 for oxidizing and decomposing pollutants in the wastewater by electrolyzing the wastewater introduced from the flow rate control tank 30; After neutralizing residual chlorine by adding sodium thiosulfate aqueous solution to the electrolyzed treated water in the electrolysis tank 40 to remove residual chlorine, the amount of colloidal particles floating in the treated water is 30 ppm or more, and the treated water is food wastewater. , petrochemical wastewater, or textile wastewater, and if flocs are generated in the treated water after treatment, a separate microbubble generator 90 ) and an inorganic coagulant to agglomerate the microbubbles supplied from and the microfloc flocked by electrical properties, respectively, into the microbubble mixing tank 51 to be mixed; a pressure flotation tank 52 for removing microbubbles and microflocs in which colloidal particles floating on the supernatant of the treated water introduced from the microbubble mixing tank 51 are collected using a scraper; After neutralizing residual chlorine by adding an aqueous sodium thiosulfate solution to the electrolyzed treated water in the electrolysis tank 40 to remove residual chlorine, the amount of floating colloidal particles in the treated water is 30 ppm or more, and the treated water is plating wastewater. , a settling tank 53 for precipitating sediment while introducing electrolysis-treated water in the case where the treated water is treated with metal product wastewater or mining wastewater and flocs are generated in the treated water after treatment; a concentrating tank 70 for concentrating the colloidal particles or the sediment deposited in the precipitation tank 53 that are collected in the microbubbles removed from the pressure flotation tank 52; a dehydrator 80 for dehydrating the concentrate transferred from the concentration tank 70; And if the electrical oxidation tank 40 is electrolyzed by introducing an aqueous solution of sodium thiosulfate in order to remove the residual chlorine in the treated process residual chlorine was colloidal smaller than the particles 30 ppm can be suspended to a post-treatment to neutralize the inside it has the thio Discharge tank 60 for discharging treated water having less than 30 ppm of colloidal particles floating after neutralizing residual chlorine by adding aqueous sodium sulfate solution, or discharging supernatant water from the pressurized flotation tank 52 or the settling tank 53 It relates to a wastewater treatment apparatus for applying different wastewater treatment methods in different treatment tanks according to the properties of the treated water after electrolysis and electrolysis of wastewater, characterized in that it includes.

In general, it is a well-known fact that awareness of environmental conservation was lacking in the course of rapid economic development. As such, due to the lack of awareness of environmental conservation, the degree of pollution of the air as well as the water quality has reached a very serious point. In particular, domestic sewage, livestock wastewater, and industrial wastewater are the cause of polluting the water quality of public waters and small and medium-sized rivers.

Contaminants in conventional domestic sewage, livestock wastewater, and industrial wastewater are mainly organic substances that can be decomposed by certain microorganisms. The proportion of inorganic and organic components is gradually increasing. In particular, wastewater from livestock facilities, wastewater from leather factories, and wastewater from dyeing factories are industries that produce toxic wastewater, and are the biggest cause of polluting the water quality of rivers, lakes, and coasts.

As described above, the standard activated sludge method using the floating growth of microorganisms has been almost universally used in treating domestic sewage, livestock wastewater and industrial wastewater. However, in the existing activated sludge method, it is difficult to remove and separate impurities contained in wastewater in public waters and urban rivers, and there are many problems in management and preservation.

In addition, most of the treatment of difficult-to-decomposable wastewater such as leachate, dyeing wastewater, and plating wastewater is a method of performing biological treatment after chemical coagulation treatment. Although the phosphorus removal effect of the chemical coagulation treatment is high, nitrogen removal is insufficient.

Therefore, I pre-treatment are not completely processed biological treatment of degradable waste water is waste water does not effective in processing, waste water, such as leachate is it contains the color of high concentration is difficult to remove the color of only the biological treatment to the appropriate level .

Recently, an electrolysis device is attracting attention, and by arranging a plurality of electrodes made of a highly conductive metal (eg, iron or aluminum) material having an anode and a cathode in the electrolytic cell and allowing the wastewater to pass through, molecular and ionic substances in the wastewater It is a method of purification treatment by causing oxidation and reduction reactions and decomposition reactions to occur.

However, in the electrolysis device, the high-conductivity metal (eg, iron or aluminum) constituting the electrode is easily oxidized by wastewater, so there is a big difference in the performance between the initial and later stages of installation, and there is a problem of increased maintenance cost due to frequent replacement. Since each electrode is connected and installed in parallel, the inflow of wastewater is variable depending on the situation, but the treatment capacity cannot be changed. There was a problem in that the device was enlarged as a process of post-processing was required.

In addition, the conventional electrolysis apparatus performs only the role of chromaticity and sterilization as an auxiliary means of wastewater treatment facilities, and simultaneous removal of COD, CN, T-N, T-P, etc. has not been achieved.

In order to solve the above problems, Patent Publication No. 10-2009-0047641 (2009.05.13.) discloses "a water collecting tank that collects the inflowing wastewater; the collected wastewater for a certain time is introduced from the water collecting tank and the PH is adjusted by injecting caustic soda. A PH control tank that controls and injects an electrolyte from the salt dissolving tank; A flow rate control tank that maintains constant PH and electrical conductivity of the wastewater introduced from the pH control tank; Electrolytic treatment of wastewater flowing in from the flow control tank to pollute the wastewater an electrolysis tank that oxidizes and decomposes; a pressurized flotation tank that separates colloidal particles and supernatant water by introducing wastewater that has passed through the electrolysis tank; ), a concentration tank that primarily removes and concentrates, and a dehydrator that dehydrates the concentrate transferred from the concentration tank to form a cake; Supernatant water separated from the pressurized flotation tank flows in and ferric sulfate is added to flocculate by electrical properties An intermediate trap for coagulating the fine flocs; a sedimentation tank for precipitating the flocs aggregated in the intermediate trap; a discharge tank 60 for discharging the supernatant water of the settling tank; characterized in that it is composed of: A wastewater treatment device by electrolysis” is presented.

However, the wastewater treatment apparatus by electrolysis of the prior art Patent Publication No. 10-2009-0047641 pressurizes the wastewater regardless of the properties of the wastewater electrolyzed (hereinafter referred to as 'electrolyzed') in the electrolysis tank. Since it is composed of going through all the flotation tanks, thickening tanks, dehydrators, intermediate tea collection tanks, and settling tanks in sequence,

For example, when colloidal particles are generated during electrolysis of wastewater in wastewater, when these colloidal particles are suspended above supernatant water, these colloidal particles are primarily removed with a scraper. is not completely removed,

In addition, for example, in the case of electrolysis of wastewater discharged from a plating plant in wastewater, colloidal particles are not generated and sediment is formed and precipitated under the supernatant, which is clear water, only through a pressurized flotation tank, a concentration tank, a dehydrator, an intermediate tank, and a sedimentation tank. In this regard, not only the increase in wastewater treatment time is inevitably accompanied by unnecessary process gas oil, but also, if the flocs deposited in the settling tank are not removed after concentration and dehydration, the removal of the flocs is buried in the soil, resulting in leachate generation, etc. There are concerns.

Patent Publication No. 10-2009-0047641 (2009.05.13.)

The wastewater treatment apparatus for applying different wastewater treatment methods in different treatment tanks according to the properties of the electrolysis and post-electrolysis treatment of wastewater according to the present invention is to solve the following issues.

It is an object of the present invention to apply a different wastewater treatment method in a different treatment tank according to the properties of the treated water after electrolysis and electrolysis of wastewater that achieves complete removal of colloidal particles when colloidal particles are generated during electrolysis of wastewater in wastewater To provide a wastewater treatment system that

Another object of the present invention is to avoid the pressure flotation tank, the concentration tank, the dehydrator, the intermediate tank, and the sedimentation tank when the colloidal particles are not generated during the electrolysis of the wastewater in the wastewater and the precipitate is formed and precipitated under the supernatant, which is clear water. By precipitating the sediment directly from the sedimentation tank, the wastewater treatment time is shortened due to the deletion of unnecessary processes, and at the same time, there is no risk of leachate generation even when the sediment is buried in the soil. It is to provide a wastewater treatment device that applies different wastewater treatment methods in the tank.

In order to solve the above problems, the wastewater treatment apparatus for applying different wastewater treatment methods in different treatment tanks according to the properties of the electrolysis and post-electrolysis treatment of wastewater according to the present invention is configured as follows.

a water collecting tank 10 for collecting the inflowing wastewater; a PH adjusting tank 20 for adjusting the PH by introducing wastewater collected for a certain period of time from the water collecting tank 10, injecting caustic soda, and injecting an electrolyte from the salt dissolving tank; a flow rate control tank 30 for maintaining constant PH and electrical conductivity of the wastewater introduced from the pH control tank 20; Electro-oxidation for oxidizing and decomposing pollutants in wastewater by electrolyzing the wastewater flowing in from the flow control tank 30 in an anode and cathode electrode cells made of metal such as steel, aluminum, titanium, platinum, iridium, or ruthenium. Joe (40); After neutralizing residual chlorine by adding sodium thiosulfate aqueous solution to the electrolyzed treated water in the electrolysis tank 40 to remove residual chlorine, the amount of colloidal particles floating in the treated water is 30 ppm or more, and the treated water is food wastewater. , petrochemical wastewater, or textile wastewater, and if flocs are generated in the treated water after treatment, a separate microbubble generator 90 ) and an inorganic coagulant to agglomerate the microbubbles supplied from and the microfloc flocked by electrical properties, respectively, into the microbubble mixing tank 51 to be mixed; a pressure flotation tank 52 for removing microbubbles and microflocs in which colloidal particles floating above the supernatant of the treated water introduced from the microbubble mixing tank 51 are collected using a scraper; After neutralizing residual chlorine by adding an aqueous sodium thiosulfate solution to the electrolyzed treated water in the electrolysis tank 40 to remove residual chlorine, the amount of floating colloidal particles in the treated water is 30 ppm or more, and the treated water is plating wastewater. , a settling tank 53 for precipitating sediment while introducing electrolysis-treated water in the case where the treated water is treated with metal product wastewater or mining wastewater and flocs are generated in the treated water after treatment; a concentrating tank 70 for concentrating the colloidal particles or the sediment deposited in the precipitation tank 53 that are collected in the microbubbles removed from the pressure flotation tank 52; a dehydrator 80 for dehydrating the concentrate transferred from the concentration tank 70; And if the electrical oxidation tank 40 is electrolyzed by introducing an aqueous solution of sodium thiosulfate in order to remove the residual chlorine in the treated process residual chlorine was colloidal smaller than the particles 30 ppm can be suspended to a post-treatment to neutralize the inside it has the thio Discharge tank 60 for discharging treated water having less than 30 ppm of colloidal particles floating after neutralizing residual chlorine by adding aqueous sodium sulfate solution, or discharging supernatant water from the pressurized flotation tank 52 or the settling tank 53 characterized by including.

The microbubble generating device 90 is disposed between the microbubble mixing tank 51 and the pressurizing flotation tank 52 to communicate the microbubble mixing tank 51 and the pressurizing flotation tank 52 and has a circular cross section. The branch has a first connector (L1); a pressurization pump 91 installed in the first connection pipe L1 to be able to withdraw the treated water in the pressurization flotation tank 52 from the lower part of the pressurization flotation tank 52; The pressure tank 92 is installed in the first connection pipe (L1) portion between the pressure pump 91 and the microbubble mixing tank (51); a second connection pipe (L2) connected in communication with a portion of the first connection pipe (L1) between the pressure pump 91 and the pressure tank 92 and having a circular cross section; And connected to the second connection pipe (L2) by supplying compressed air having a set compressed air pressure to the first connection pipe (L1) portion between the pressure pump 91 and the pressure tank 92 to the first connection pipe (L1) ) characterized in that it comprises an air compressor 93 capable of generating microbubbles by colliding with the treated water flowing through.

The present invention can exhibit the following effects by the above solution.

First, when colloidal particles are generated during the electrolysis of wastewater in wastewater, a wastewater treatment device that applies a different wastewater treatment method in different treatment tanks according to the properties of the treated water after electrolysis and electrolysis of wastewater that achieves complete removal of colloidal particles has the effect of providing

Another object of the present invention is to avoid the pressure flotation tank, the concentration tank, the dehydrator, the intermediate tank, and the sedimentation tank when the colloidal particles are not generated during the electrolysis of the wastewater in the wastewater and the precipitate is formed and precipitated under the supernatant, which is clear water. By precipitating the sediment directly from the sedimentation tank, the wastewater treatment time is shortened due to the deletion of unnecessary processes, and at the same time, there is no risk of leachate generation even when the sediment is buried in the soil. There is an effect of providing a wastewater treatment device that applies different wastewater treatment methods in the tank.

1 is a block diagram of a wastewater treatment apparatus illustrating application of different wastewater treatment methods in different treatment tanks according to properties of electrolysis and post-electrolysis treatment of wastewater according to an embodiment of the present invention;
Figure 2 is a view showing a microbubble generating device installed between the microbubble mixing tank and the pressure flotation tank of Figure 1;

Hereinafter, various embodiments of the present invention will be described with reference to the accompanying drawings. However, this is not intended to limit the technology described in the present invention to specific embodiments, and it is to be understood that various modifications, equivalents, and/or alternatives of the embodiments of the present invention are included. In connection with the description of the drawings, like reference numerals may be used for like components.

In addition, expressions such as "first," "second," used in the present invention can modify various elements regardless of order and/or importance, and in order to distinguish one element from another element, It is used only and does not limit the corresponding components. For example, 'first part' and 'second part' may represent different parts regardless of order or importance. For example, without departing from the scope of the rights described in the present invention, a first component may be referred to as a second component, and similarly, the second component may also be renamed as a first component.

In addition, the terms used in the present invention are used only to describe specific embodiments, and may not be intended to limit the scope of other embodiments. The singular expression may include the plural expression unless the context clearly dictates otherwise. Terms used herein, including technical or scientific terms, may have the same meanings as commonly understood by one of ordinary skill in the art described in the present invention. Among the terms used in the present invention, terms defined in a general dictionary may be interpreted with the same or similar meaning as the meanings in the context of the related art, and unless explicitly defined in the present invention, ideal or excessively formal meanings is not interpreted as In some cases, even terms defined in the present invention cannot be construed to exclude embodiments of the present invention.

Hereinafter, an exemplary embodiment of the present invention for solving the above problems in conjunction with the accompanying drawings will be described.

1 is a block diagram of a wastewater treatment apparatus showing the application of different wastewater treatment methods in different treatment tanks for each property of treated water after electrolysis and electrolysis of wastewater according to an embodiment of the present invention, and FIG. 2 is a block diagram of FIG. It is a view showing a microbubble generating device installed between the microbubble mixing tank and the pressure flotation tank.

1 and 2, the wastewater treatment apparatus for applying different wastewater treatment methods in different treatment tanks according to the properties of the electrolysis and post-electrolysis treatment of wastewater according to a preferred embodiment of the present invention includes a water collecting tank 10, a PH adjusting tank (20), flow rate control tank (30), electrooxidation tank (40), microbubble mixing tank (51), pressurized flotation tank (52), settling tank (53), thickening tank (70), dehydrator (80), and discharge tank (60).

First, a water collecting tank 10 is installed in order to collect the inflowing wastewater to collect the wastewater for a certain period of time. The wastewater collected in this way flows from the water collecting tank 10 into the PH adjusting tank 20 .

The pH adjustment tank 20 adjusts the pH to 9 to 10 by injecting caustic soda to adjust the optimum pH to induce aggregation of the coagulant. In particular, when the inflowing wastewater contains high levels of suspended solids and colloidal particles, the concentration of phosphorus is abnormally high, and the chromaticity is high, the coagulation of the coagulant is induced by controlling the PH.

In addition, if the electrolyte in the wastewater is insufficient, the electrolysis efficiency is decreased due to an increase in electrical resistance and the electric power cost is increased. For this reason, the electrolyte from the salt dissolving tank is injected into the PH adjusting tank. In particular, it is preferable to maintain the electrical conductivity in the wastewater at 5 to 15 ms.

It is also possible to use white charcoal powder or sulfonated polystyrene-based resin , which is oak charcoal, as the electrolyte. The white charcoal powder, which is the oak charcoal, is easy to purchase, and the polystyrene-based resin has excellent electrical properties, satisfactory strength, and sufficient water resistance and is inexpensive. .

The wastewater into which caustic soda and electrolyte are injected from the PH adjusting tank 20 flows into the flow rate adjusting tank 30 to adjust the flow rate while maintaining the PH and electrical conductivity constant.

The wastewater of the flow control tank is forcibly introduced into the electrooxidation tank 40 by a pump to be subjected to electrolysis treatment, and pollutants of the wastewater are oxidized and decomposed. In the electrolysis process, it is preferable to supply direct current using a rectifier dedicated to direct current power supply capable of converting an anode and a cathode to maintain a constant constant voltage and constant current. When the wastewater flowing into the electrolysis tank is electrolyzed, hydroxide ions, hypochlorous acid, and generator oxygen are generated. These oxidizing substances act on organic substances to cause oxidation, thereby removing organic substances.

In particular, the electrooxidation tank 40 according to the present invention is configured by connecting the electrolysis cells in series, and the electrooxidation tank 40 is a closed type, which has the advantage that it is less affected by the external environment. have. Therefore, when the electrooxidation tank 40 is operated, wastewater is pressurized into the electrooxidation tank 40 equipped with the anode and cathode cells to prevent contact with external air until the electrolysis reaction starts and ends. There is a characteristic that the reaction takes place only inside the electrolysis tank without it. At this time, the voltage supplied to the electrooxidation tank 40 is maintained at 5V per cell, and the current is 200A, and the wastewater passing through the electrooxidation tank 40 maintains a pressure of ^{1 to 2 kg/cm 2 .}

The treated water electrolyzed in the electrooxidation tank 40 is introduced into the microbubble mixing tank 51, and sodium thiosulfate is used to remove residual chlorine from the electrolyzed treated water in the electrooxidation tank 40. After neutralizing residual chlorine by adding an aqueous solution, the amount of floating colloidal particles in the treated water is 30 ppm or more. The treated water is food wastewater, petrochemical wastewater, or fiber wastewater. In this case, the microbubbles supplied from the separate microbubble generator 90 and the microbubbles flocculated by electrical properties are aggregated to collect colloidal particles floating while introducing the electrolyzed treated water. Inorganic flocculants are respectively injected|thrown-in and mixed.

Here, the concentration of the sodium thiosulfate aqueous solution input to the treated water is preferably 50%, but the present invention is not limited thereto, and the concentration of the sodium thiosulfate aqueous solution input to the treated water is 45 to 49%, or 51 to 55%. Configuration is also possible.

Here, it is possible to use aluminum sulfate, ferrous sulfate, ferric sulfate, polyaluminum chloride, ferrous chloride, or ferric chloride as the inorganic coagulant to be added.

The aluminum sulfate is the most widely used coagulant to this day because of its excellent cohesive properties, inexpensive, non-toxic, suitable for turbidity in almost all types of water, and easy handling due to its low corrosiveness. The ferrous sulfate has an advantage in that the flocs are heavy and the sedimentation rate is fast and the price is cheap. The ferric sulfate is applied in the Fenton oxidation method for wastewater treatment. The polyaluminum chloride can be said to be a second-generation coagulant that is used after aluminum sulfate, and its coagulation and floc formation are significantly faster than aluminum sulfate, and it is very effective for all turbidity. Because of its excellent coagulation ability, it is currently mostly used as a coagulant in water treatment plants. The ferric chloride has advantages in that the flocs are heavy, so the sedimentation rate is fast, the color removal is effective, the cohesive PH range is wide, and it is effective in the removal of hydrogen sulfide or the destruction of the emulsion. Ferrous chloride is oxidized to ferric chloride in the presence of air. After that, the mechanism exhibits the same aggregation effect as ferric chloride, and the solubility of ferrous chloride is twice as high as that of ferrous sulfate solution. As a liquid product, it has the advantage of reducing the amount of use.

In the pressurizing flotation tank 52 , the microbubbles and microflocs in which the colloidal particles floating above the supernatant of the treated water introduced from the microbubble mixing tank 51 are collected are removed using a scraper.

After neutralizing residual chlorine by adding an aqueous sodium thiosulfate solution to the electrolyzed treated water in the electrolysis tank 40 to remove residual chlorine, the amount of floating colloidal particles in the treated water is 30 ppm or more, and the treated water is plating wastewater. , metal product wastewater, or mining wastewater, and when flocs are generated in the treated water after treatment, the sediment is precipitated while the electrolytically treated water is introduced into the settling tank 53 .

The microbubbles and microflocs in which the colloidal particles are collected are removed by a scraper and transferred to the thickening tank 70. In the thickening tank 70, the colloidal properties that are collected in the microbubbles removed from the pressurized flotation tank 52. Concentrate the particles or the precipitate deposited in the sedimentation tank (53).

The concentrate concentrated in the concentration tank 70 is transferred to the dehydrator 80 and dehydrated by the dehydrator 80 .

The discharge tank 60 neutralizes residual chlorine by adding an aqueous sodium thiosulfate solution to the electrolyzed treated water in the electrooxidation tank 40 to remove residual chlorine, and then floating colloidal particles in the treated water. In the case of less than 30 ppm, the aqueous solution of sodium thiosulfate is added to neutralize residual chlorine, and then the treated water in which the floating colloidal particles are less than 30 ppm is discharged, or the supernatant of the pressurized flotation tank 52 or the settling tank 53 is discharged. do.

As shown in Figure 2, the microbubble generating device 90, the microbubble mixing tank 51 and the pressure flotation tank 52 to communicate with the microbubble mixing tank 51 and the pressure flotation tank 52 A first connector (L1) disposed between and having a circular cross section; a pressurization pump 91 installed in the first connection pipe L1 to be able to withdraw the treated water in the pressurization flotation tank 52 from the lower part of the pressurization flotation tank 52; The pressure tank 92 is installed in the first connection pipe (L1) portion between the pressure pump 91 and the microbubble mixing tank (51); a second connection pipe (L2) connected in communication with a portion of the first connection pipe (L1) between the pressure pump 91 and the pressure tank 92 and having a circular cross section; And connected to the second connection pipe (L2) by supplying compressed air having a set compressed air pressure to the first connection pipe (L1) portion between the pressure pump 91 and the pressure tank 92 to the first connection pipe (L1) ) includes an air compressor 93 capable of generating microbubbles by impinging on treated water flowing through it. As such, compressed air having a set compressed air pressure is generated in the air compressor 93 and collided with the treated water flowing through the first connection pipe L1 to generate microbubbles, and then the microbubbles are generated in the pressure tank 92. The pressure due to the flow rate of the treated water generated by the operation of the pressurization pump 91 and the set compressed air pressure generated from the air compressor 93 are combined, and the treated water and microbubbles are uniformly mixed while being pressurized, and then microbubbles are mixed. It is introduced into the tank 51, and microbubbles contained in the introduced treated water are mixed with the electrolyzed treated water in the electrooxidation tank 40 to collect the floating colloidal particles.

In this embodiment, the set compressed air pressure ^{is preferably 5kgf/cm 2} or more. The reason is that when the set compressed air pressure is ^{less than 5kgf/cm 2 ,} the amount of microbubbles required in the present invention is insufficient.

In addition, the pressure pump 91 stops when the head exceeds 40 mH, and operates when the head becomes less than 40 mH. As such, the pressurization pump 91 is configured to stop when the head is 40 mH or more and to operate when the head is less than 40 mH. As a result, it is possible to allow the treated water to be introduced into the microbubble mixing tank 51 by a certain amount from the pressure flotation tank 52 when the pressure pump 91 is operated.

In addition, the microbubbles and the treated water mixed in the microbubble mixing tank 51 are mixed in a volume ratio of 1:9. As such, when the microbubbles and the treated water are mixed in a volume ratio of 1:9, the colloidal particle collection efficiency of the microbubbles generated and supplied using the air compressor 93 having a set compressed air pressure of ^{5 kgf/cm 2 or more is the highest.} , When the microbubbles are mixed in a volume ratio of less than 1, the colloidal particle trapping efficiency of the microbubbles is relatively low, and when the microbubbles are mixed in a volume ratio of more than 1, the colloidal particle trapping efficiency of the microbubbles is equal to that of the microbubbles. There was no difference from when the treated water was mixed in a volume ratio of 1:9, but the purchase or installation cost of the air compressor 93 increases because the air compressor 93 having a relatively higher or larger set compressed air pressure must be used. .

On the other hand, Figure 3 is disposed between the microbubble mixing tank and the pressure flotation tank to communicate the microbubble mixing tank and the pressure flotation tank of Figure 1 and a first connector having a circular cross section, and a second connection connected to the first connector tube It is a view showing another embodiment of the tube, and FIG. 4 is a closed elliptical end face of the second connector on the side connected to the first connector L1 of FIG. 3 and a plurality of closed oval end faces formed on the end face. It is a figure which shows a through-hole.

In another embodiment , the compressed air collides with the treated water flowing in the first connection pipe (L1) while generating a swirling rotational flow in the first connection pipe (L1) to generate microbubbles, the second connection The pipe (L2) is obliquely connected to the first connecting pipe (L1) in the flow direction of the treated water and at the same time closed while having an elliptical end surface (L2a) closed on the side connected to the first connecting pipe (L1) A plurality of through-holes L2h through which compressed air can pass are formed in the vicinity of the edge of the elliptical end face L2a.

By being configured as described above, compressed air from the second connection pipe (L2) collides with the treated water flowing in the first connection pipe (L1) while generating a vortex-type rotational flow in the first connection pipe (L1) It is possible to generate microbubbles with a finer size by generating the bubbles, which in turn leads to an increase in the colloidal particle trapping efficiency of the microbubbles.

In another embodiment, the first connecting pipe (L1) has a plurality of protrusions formed on the inner surface of the compressed air from the second connecting pipe (L2) as above in the vortex-type rotational flow in the first connecting pipe (L1) When it collides with the treated water flowing in the first connecting pipe L1 while generating It is possible to form microbubbles with a smaller size, which in turn leads to an increase in the colloidal particle trapping efficiency of microbubbles.

Although the present invention described above has been described with reference to one embodiment shown in the drawings, this is merely exemplary, and various modifications and equivalent other embodiments are possible by those skilled in the art. should be made clear. Accordingly, the true technical protection scope of the present invention should be construed by the appended claims, and all technical ideas within the scope equivalent thereto should be construed as being included in the scope of the present invention.

10: water collection tank 20: PH adjustment tank
30: flow control tank 40: electric oxidation tank
51: microbubble mixing tank 52: pressure flotation tank
53: sedimentation tank 60: discharge tank
70: thickening tank 80: dehydrator
90: microbubble generator 91: pressurized pump
92: pressurized tank 93: air compressor
L1: first connector L2: second connector
L2a : Elliptical end face L2h : Through hole

Claims (2)

a water collecting tank 10 for collecting the inflowing wastewater;
a PH adjusting tank 20 for adjusting the PH by introducing wastewater collected for a certain period of time from the water collecting tank 10, injecting caustic soda, and injecting an electrolyte from the salt dissolving tank;
a flow rate control tank 30 for maintaining constant PH and electrical conductivity of the wastewater introduced from the pH control tank 20;
an electrooxidation tank 40 for oxidizing and decomposing pollutants in the wastewater by electrolyzing the wastewater introduced from the flow rate control tank 30;
After neutralizing residual chlorine by adding sodium thiosulfate aqueous solution to the electrolyzed treated water in the electrolysis tank 40 to remove residual chlorine, the amount of colloidal particles floating in the treated water is 30 ppm or more, and the treated water is food wastewater. , petrochemical wastewater, or textile wastewater, and if flocs are generated in the treated water after treatment, a separate microbubble generator 90 ) and an inorganic coagulant to agglomerate the microbubbles supplied from and the microfloc flocked by electrical properties, respectively, into the microbubble mixing tank 51 to be mixed;
a pressure flotation tank 52 for removing microbubbles and microflocs in which colloidal particles floating on the supernatant of the treated water introduced from the microbubble mixing tank 51 are collected using a scraper;
After neutralizing residual chlorine by adding an aqueous sodium thiosulfate solution to the electrolyzed treated water in the electrolysis tank 40 to remove residual chlorine, the amount of colloidal particles floating in the treated water is 30 ppm or more, and the treated water is plating wastewater. , a settling tank 53 for precipitating sediment while introducing electrolysis-treated water in the case where the treated water is treated with metal product wastewater or mining wastewater and flocs are generated in the treated water after treatment;
a concentrating tank 70 for concentrating the colloidal particles or the sediment deposited in the precipitation tank 53 that are collected in the microbubbles removed from the pressure flotation tank 52;
a dehydrator 80 for dehydrating the concentrate transferred from the concentration tank 70; and
In the electrooxidation tank 40, an aqueous sodium thiosulfate solution is added to the treated water electrolyzed to remove residual chlorine to neutralize residual chlorine. When the amount of colloidal particles floating in the treated water is less than 30 ppm, sodium thiosulfate After neutralizing residual chlorine by inputting an aqueous solution, the treated water having floating colloidal particles of less than 30 ppm is discharged, or the discharge tank 60 for discharging the supernatant of the pressurized flotation tank 52 or the settling tank 53 is included. doing,
A wastewater treatment apparatus for applying different wastewater treatment methods in different treatment tanks according to the properties of the treated water after electrolysis and electrolysis of wastewater, characterized in that white charcoal powder, which is oak charcoal, is used as the electrolyte. According to claim 1,
The microbubble generating device 90,
A first connector (L1) disposed between the microbubble mixing tank 51 and the pressure flotation tank 52 to communicate the microbubble mixing tank 51 and the pressure flotation tank 52 and having a circular cross section;
a pressurizing pump 91 installed in the first connecting pipe L1 so as to be able to withdraw the treated water in the pressurizing flotation tank 52 from the lower part of the pressurizing flotation tank 52;
The pressure tank 92 is installed in the first connection pipe (L1) between the pressure pump 91 and the microbubble mixing tank (51);
a second connection pipe (L2) connected in communication with a portion of the first connection pipe (L1) between the pressure pump 91 and the pressure tank 92 and having a circular cross section; and
It is connected to the second connection pipe (L2) and supplies compressed air having a set compressed air pressure to the first connection pipe (L1) part between the pressurized pump 91 and the pressurized tank 92 to the first connection pipe (L1). Different wastewater treatment methods in different treatment tanks for each property of treated water after electrolysis and electrolysis of wastewater, characterized in that it includes an air compressor 93 capable of generating microbubbles by colliding with treated water flowing through Applied wastewater treatment equipment.

Images