KR101221565B1 - Electrolytic treatment of waste water - Google Patents

Abstract

The present invention relates to an apparatus for treating wastewater using electrocoagulation, wherein an amount of inorganic or organic coagulant is added to a wastewater flowing into the reaction chamber, or a mixture of inorganic and organic coagulants is mixed at a predetermined ratio. The purpose is to improve the formation to further improve the aggregation rate. The present invention configured for this purpose is provided with a wastewater inlet for inflow of wastewater and a treated water outlet for outflowing the treated water with coagulation treatment, in which an electrocoagulation reaction is performed, and an anode plate and an anode plate are arranged at alternating intervals inside the reaction chamber. In the wastewater treatment apparatus through an electrocoagulation, which is fixed but has an electrode plate for applying current to the wastewater to electroaggregate particulate contaminants in the wastewater, and a power supply unit for supplying power to the electrode plate. Installed in the reaction chamber, and the mixed water or inorganic coagulant mixed with inorganic coagulant and inorganic coagulant in the ratio of 90 ~ 99.9: 0.1 ~ 10% by weight is added to the waste water flowing into the reaction chamber through the waste water inlet. Including a coagulant injector to allow the aggregation of the particles or emulsion particles and insoluble particles The lure is.

Description

Electrolytic treatment of waste water

The present invention relates to a wastewater treatment apparatus using electrocoagulation, and more particularly, to a wastewater flowing into the reaction chamber by introducing a certain amount of an inorganic coagulant or an organic coagulant or mixing an inorganic coagulant and an organic coagulant at a predetermined ratio. The present invention relates to a wastewater treatment apparatus using electrocoagulation to improve the chromaticity, COD, BOD, TSS (solid suspended solids) and TN (total nitrogen) removal efficiency of the wastewater.

It is well known that there is a lack of awareness of environmental conservation in the course of rapid economic development. Due to this lack of awareness of environmental conservation, the level of pollution as well as air quality has reached a very serious level. In particular, domestic sewage, agricultural and livestock waste, and industrial wastewater cause pollution of public waters such as appeals, inner bays and inland seas, and urban small and medium rivers.

Therefore, the achievement rate of chemical oxygen demand (COD) and biochemical oxygen demand (BOD), which are related to total nitrogen (N) and total phosphorus (P) such as appeal due to water pollution and inland and inland sea, are very low. . Moreover, since rivers, lakes, and dams are often sources of drinking water, mold odors, filter disturbances, and abnormal proliferation of toxic algae are emerging as causes of major water pollution.

On the other hand, conventionally generated pollutants such as domestic sewage, agricultural and livestock wastewater, and industrial wastewater are mainly organic substances that can be decomposed by certain microorganisms, but in recent years, due to rapid industrial development, population growth, and urban population concentration, As the amount of various water increases, the proportion of inorganic components in the wastewater is gradually increasing. In particular, wastewater from livestock facilities, wastewater from leather factories, and wastewater from dyeing factories are the industries that discharge malignant wastewater, and may be the biggest cause of polluting water quality such as rivers, lakes, coasts, and bays.

In Korea, the standard activated sludge method and its variations using floating growth of microorganisms have been almost universally used in the treatment of domestic wastewater, agricultural and livestock wastewater, and industrial wastewater. However, the existing activated sludge method is difficult to remove and separate impurities contained in wastewater in public waters such as lakes, inner bays and inland seas, and urban small and medium rivers. It is developed and used.

On the other hand, the wastewater treatment apparatus through the electro-aggregation according to the prior art described above is a reaction chamber having an inlet for inflow of wastewater and an outlet for discharging the reaction treatment water, the electrode plate and the electrode fixed to be arranged at a predetermined interval inside the reaction chamber It consists of a power supply unit for supplying power to the plate. The wastewater treatment apparatus using the electrocoagulation according to the conventional technology is to react with the wastewater introduced from the surface of the electrode plate through the supply of power so that the condensation of impurities is carried out to discharge the treated water in which the impurities are removed and separated. To be possible.

However, the conventional wastewater treatment apparatus through electrocondensation as described above has a limitation in removing and separating impurities only by electroaggregation in treating impurities in the introduced wastewater. Therefore, the wastewater treatment apparatus through electrocoagulation according to the prior art has a difficulty in treating a large amount of wastewater.

In addition, the wastewater treatment apparatus through electrocoagulation according to the prior art is difficult to shorten the time due to the removal of chromaticity, COD, BOD, TSS (solid suspended solids) and TN (total nitrogen) of the incoming wastewater by electrocoagulation alone. As a result, the rapid improvement of the cohesive efficiency is difficult to expect.

The present invention has been made to solve all the problems of the prior art, by adding a certain amount of inorganic coagulant or organic coagulant to the wastewater flowing into the reaction chamber or by mixing the inorganic coagulant and organic coagulant in a fixed ratio (Floc It is an object of the present invention to provide a wastewater treatment apparatus using electrocoagulation which can improve the formation of c) to improve the aggregation rate.

Another object of the technology according to the present invention is to add a certain amount of inorganic coagulant or organic coagulant to the wastewater flowing into the reaction chamber, or to mix the inorganic coagulant and the organic coagulant in a ratio to enable the removal of the appropriate turbidity, To get the treated water.

Another object of the technology according to the present invention is to add a certain amount of inorganic coagulant or organic coagulant to the wastewater flowing into the reaction chamber or to mix the inorganic coagulant and the organic coagulant in a certain ratio to further remove the organic matter in the water treatment process Its purpose is to improve it.

In addition, the technology according to the present invention by adding a certain amount of inorganic coagulant or organic coagulant to the waste water flowing into the reaction chamber or by mixing the inorganic coagulant and the organic coagulant at a constant ratio to improve the cohesive efficiency of large capacity wastewater treatment apparatus The purpose is to make it suitable for construction.

The present invention configured to achieve the above object is as follows. That is, the wastewater treatment apparatus using the electrocoagulation according to the present invention is provided with a wastewater inlet for inflow of wastewater and a treated water outlet for outflow of the treated water with coagulation treatment, and a reaction chamber in which the electrocoagulation reaction is performed, and a negative electrode plate and a positive electrode plate in the reaction chamber. In the waste water treatment apparatus through the electro-aggregation is arranged in a fixed interval alternately but the electrode plate for applying current to the waste water to electroaggregate particulate contaminants in the waste water and the power supply unit for supplying power to the electrode plate. , A mixed coagulant or an inorganic coagulant, which is installed on the waste water inlet of the reaction chamber, wherein the inorganic coagulant and the organic coagulant are mixed in the ratio of 90 to 99.9: 0.1 to 10% by weight in the waste water introduced into the reaction chamber through the waste water inlet. Coagulation agent to allow flocculation of suspended particles, emulsion particles and insoluble particles in the waste water It comprises a configuration including a group.

On the other hand, the inorganic coagulant in the configuration of the present invention as described above may be made of one or more selected from ferric polysulfate, ferric sulfate, ferric chloride, aluminum chloride, poly aluminum chloride and aluminum sulfate.

In addition, in the configuration according to the present invention, in addition to the above-described configuration, an ozone generator for generating ozone (O ₃ ) at the wastewater inlet side of the reaction chamber and injecting the generated ozone (O ₃ ) into the wastewater introduced through the wastewater inlet may be further configured. Can be.

In addition, in the configuration according to the present invention, in addition to the above-described configuration, the reaction chamber may further include an ultrasonic generator for removing a scale attached to the surface of the electrode plate through periodic ultrasonic oscillation.

In addition, the amount of flocculant added in the configuration according to the present invention is more preferably added in an amount of 10 ~ 10,000ppm depending on the properties of the waste water.

According to the technique of the present invention, by adding a certain amount of inorganic coagulant or organic coagulant to the wastewater flowing into the reaction chamber or by mixing the inorganic coagulant and the organic coagulant in a ratio to improve the formation of flocs (Floc), Due to this, the aggregation speed can be further improved.

In addition, the technique according to the present invention by adding a certain amount of inorganic coagulant or organic coagulant to the wastewater flowing into the reaction chamber or by mixing the inorganic coagulant and the organic coagulant in a certain ratio to further improve the removal effect of the organic matter of the appropriate turbidity In addition to enabling removal, high quality treated water can be obtained through this.

Furthermore, the technology according to the present invention improves the coagulation efficiency by adding a certain amount of inorganic coagulant or organic coagulant or mixing the inorganic coagulant and the organic coagulant at a constant ratio into the wastewater flowing into the reaction chamber, thereby allowing a large capacity. Wastewater treatment system can be configured.

1 is a cross-sectional view showing a wastewater treatment apparatus using electrocoagulation in accordance with the present invention.

Hereinafter, a wastewater treatment apparatus using electrocoagulation according to a preferred embodiment of the present invention will be described in more detail.

1 is a cross-sectional view showing a wastewater treatment apparatus using electrocoagulation according to the present invention.

First, electrocoagulation is a process of stabilizing and flocculating suspended particles, emulsion particles, insoluble particles in the waste water by applying a current to the waste water. The electric current imposed on the wastewater acts as an electrical driving force to cause a chemical reaction, and the dissolved metal is hydrolyzed to form suspended dissolved and colloidal hydroxides, wherein the generated metal hydroxide is more active than the chemically prepared hydroxide. Because of its strong and low potential, it has excellent flocculation, adsorption and sedimentation characteristics and is effective for wastewater treatment.

In addition, oxygen generated at the anode may oxidize organic matter in the water, and bubbles generated by hydrogen and oxygen gas generated at the cathode and the anode may be utilized in the flotation method. That is, ions generated at the electrode by applying an electric current cause chemical reactions and precipitation, or flocculate and ionize colloidal particles to remove contaminants.

As shown in FIG. 1, the wastewater treatment apparatus 100 using the electrocoagulation according to the present invention comprises a coagulant injector 140 installed on the wastewater inlet 112 of the reaction chamber 110 in which the electrocoagulation reaction is performed. A certain amount of flocculant is added to the incoming wastewater to react to allow flocculation of suspended particles, emulsion particles and insoluble particles in the wastewater.

In other words, looking at the configuration of the wastewater treatment apparatus 100 using the electrocoagulation according to the present invention, the wastewater inlet 112 through which the wastewater flows in and the treated water outlet 114 through which the coagulated treated water flows are provided. In this reaction chamber 110, the negative electrode plate and the positive electrode plate inside the reaction chamber 110 is fixedly arranged in alternating intervals, but the electrode plate 120 for applying the current to the wastewater to electroaggregate particulate contaminants in the wastewater A coagulant injector 140 is installed on the power supply 130 supplying power to the electrode plate 120 and the waste water inlet 112 of the reaction chamber 110 to allow a predetermined amount of coagulant to be introduced into the wastewater. ) Is composed of.

On the other hand, in the configuration of the wastewater treatment apparatus 100 using the electrocoagulation according to the present invention is installed on the wastewater inlet of the reaction chamber in the wastewater introduced through the flocculant injector 140 of the reaction chamber 110 through the wastewater inlet The added flocculant is a mixture of the inorganic coagulant and the organic coagulant at a ratio of 90 to 99.9: 0.1 to 10% by weight, or a mixed coagulant is added or the entire amount of the inorganic coagulant is reacted. At this time, the amount of flocculant is preferably added to 10 ~ 3000 ppm depending on the properties of the waste water.

As described above, a certain amount of flocculant is introduced into the wastewater flowing into the wastewater inlet 112 of the reaction chamber 110 through the flocculant injector 140 so that the suspended particles, the emulsion particles, and the insoluble particles in the wastewater can be aggregated. It is possible to further improve the chromaticity, COD, BOD, TSS (solid suspended solids) and TN (total nitrogen) removal and flocculation efficiency of the introduced wastewater. In addition, by adding a flocculant, it is suitable to construct a large-capacity wastewater treatment apparatus suitable for high concentration wastewater treatment and removal of specific ions (F, Ca, P, Si, Mn, etc.).

On the other hand, the inorganic coagulant introduced through the flocculant injector 140 in the configuration of the present invention as described above is made of one or two or more selected from iron polysulfate, iron sulfate, iron chloride, aluminum chloride, aluminum aluminum chloride and aluminum sulfate.

In the wastewater treatment apparatus 100 using the electrocoagulation configured as described above, ozone (O ₃ ) is injected into the wastewater introduced into the reaction chamber 110 through the wastewater inlet 112 to sterilize the ozone (O ₃ ). The ozone generator 150 which removes residual bacteria (bacteria, viruses, fungi, E. coli, etc.), odors and organic substances (heavy metal components, etc.) in the waste water through the disinfection function further improves the electrocoagulation reaction. It can be further configured.

In other words, the wastewater treatment apparatus 100 through electrocoagulation according to the present invention is fixed to the reaction chamber 110 and the inside of the reaction chamber 110 to coagulate the introduced wastewater through an electrocoagulation reaction. To the wastewater that is installed on the wastewater inlet 112 of the electrode plate 120, the power supply unit 130 for supplying power to the electrode plate 120, and the reaction chamber 110 to electro-aggregate the introduced wastewater In addition to the configuration of the wastewater treatment device 100 consisting of a flocculant injector 140 for allowing a predetermined amount of flocculant to be added and reacted, an ozone generator 150 for generating air O ₂ into ozone O ₃ through discharge. ) Is further configured.

As described above, the wastewater treatment apparatus 100 through the electroagglomeration of the present invention for injecting ozone (O ₃ ) into the wastewater introduced into the reaction chamber 110 is sterilized and disinfected of ozone (O ₃ ). By removing the residual bacteria (bacteria, viruses, fungi, E. coli, etc.), odors and organic substances (heavy metal components, etc.) in the waste water through the function, as well as the electrocoagulation reaction of the electrode plate 120 Allow less scale to adhere to the surface.

On the other hand, ozone (O ₃ ) is a pure oxygen fuselage that generates ozone (O ₃ ) by electric silent discharge and blows it into water or uses it in the air. It is a gas sterilized within a few seconds and returned to dissolved oxygen in water.

As described above, ozone (O ₃ ) is an unstable gas, which is highly chemically active, and thus harmful bacteria and viruses in the air and water, various harmful gases that cause bad smell, and organic substances (solvents, pesticides, heavy metal components) that are harmful to the human body. Etc.) attack the back and chemical reaction with them to oxidize. This property is used to make air or water clean and sterilized.

Hereinafter, the wastewater treatment apparatus 100 through electrocoagulation according to the present invention will be described in detail. That is, the wastewater treatment apparatus 100 through the electrocoagulation of the present invention includes a reaction chamber 110 having a wastewater inlet 112 through which wastewater is introduced and a treated water outlet 114 through which the electrocoagulated treated water is discharged. In order to supply power to the electrode plate 120 and the electrode plate 120, the cathode plate and the anode plate are fixedly arranged at alternating intervals in the chamber 110 to electroaggregate the wastewater introduced into the reaction chamber 110. It is installed on the wastewater inlet 112 of the power supply unit 130 and the reaction chamber 110, and the air (O ₂ ) through the coagulant injector 140 and discharge to inject a certain amount of coagulant into the incoming wastewater. It consists of a configuration of the ozone generator 150 to generate ozone (O ₃ ).

In the configuration of the present invention as described above, the wastewater flowing into the reaction chamber 110 may be introduced into the lower portion of the reaction chamber 110 to be coagulated through the electrocoagulation and then discharged to the upper portion of the reaction chamber 110. The wastewater inlet 112 through which the wastewater is introduced is formed at one lower side of the reaction chamber 110, and the treated water outlet 114 is formed at one upper side thereof.

Meanwhile, in the configuration of the present invention, the electrode plate 120 is made of a consumable material such as iron plate, aluminum plate, stainless steel plate and titanium plate, and made of a non-consumable material such as platinum. The consumable electrode plate can be used alone or in combination.

The wastewater treatment apparatus 100 of the present invention configured as described above has a flocculant injector 140 in wastewater introduced into the reaction chamber 110 through the wastewater inlet 112 of the reaction chamber 110. in certain amount of the coagulant the other hand, the ozone generated by the ozone generator (150) (O ₃₎ of ozone in the waste water introduced into the reaction chamber (110) (O ₃₎ so that the through-containing.

As described above, the flocculant introduced into the wastewater introduced into the reaction chamber 110 enables flocculation of suspended particles, emulsion particles, and insoluble particles in the wastewater, so that the color of the inflowed wastewater, COD, BOD, TSS (high Forming suspended solids) and TN (total nitrogen) removal and cohesive efficiency.

Then, the ozone in the incoming waste water (O ₃₎ is contained such that the ozone (O ₃₎ contained by injecting ozone (O ₃₎ generated by the ozone generator 150 to the waste water inlet 112 of the reaction chamber 110 Waste water is sterilized and sterilized by bacteria, viruses, odors, etc. by the function of ozone (O ₃ ) in the reaction chamber 110, and is also deodorized and removed.

Moreover, the waste water is decolorized by the bleaching and decolorizing function of ozone (O ₃ ), so that the color thereof is decolorized to be almost colorless, and the chemical oxygen demand (COD) of the waste water and the biochemical oxygen demand (BOD) Requirements), TSS (solid suspended solids) and TN (total nitrogen) are also shortened by the sterilization and disinfection of ozone (O ₃ ), removal of harmful gases and heavy metals, bleaching and bleaching.

As described above, the color of the waste water is uncolored through sterilization and disinfection of ozone (O ₃ ) injected into the waste water, removal of harmful gases and heavy metals, bleaching and decolorization, and COD, BOD, and TSS (solid suspended solids) of the waste water. And by shortening the removal time of the TN (total nitrogen) can improve the efficiency of flocculation treatment of the waste water during the electroaggregation by the electrode plate 120 can shorten the wastewater treatment time, as well as to treat a large amount of wastewater in a short time. have.

Wastewater treatment apparatus 100 through electrocoagulation according to the present invention is the reaction chamber made by the electro-agglomeration reaction occurring in the electrode plate 120 by the injection of ozone (O ₃ ) and the power supplied from the power supply unit 130 ( 110) Inside, the colorlessness of the wastewater by the function of ozone (O ₃ ), removal of COD, BOD, TSS (solid suspended solids) and TN (total nitrogen) of the wastewater, and electrocoagulation reaction by the electrode plate 120 This is done at the same time.

On the other hand, the electrode plate 120 by inhibiting the adhesion of the scale to the surface of the electrode plate 120 through the sterilization and disinfection of ozone (O ₃ ) injected into the waste water, removal of harmful gases and heavy metals, bleaching and decolorization as described above It also has a function to keep the electrocoagulation reaction of the electrode plate 120 constant by reducing the scale adhesion amount of the surface.

In addition, the wastewater treatment apparatus 100 through electrocoagulation according to the present invention periodically oscillates ultrasonic waves through the ultrasonic generator 160 further installed on the lower side of the reaction chamber 110 to form an electrode plate inside the reaction chamber 110. The scale attached to the surface 120 may be periodically removed by ultrasonic waves. As such, by periodically removing the scale attached to the surface of the electrode plate 120 through ultrasonic oscillation, the electrocoagulation reaction can be kept constant.

The wastewater treatment apparatus 100 through electrocoagulation according to the present invention has an electrode plate 120 because the wastewater is introduced from the lower portion of the reaction chamber 110 to discharge the coagulated treated water through the electrocoagulation through the upper portion. The scale is attached from the bottom of. Therefore, the ultrasonic generator 160 is preferably installed at the lower side of the reaction chamber 110 near the lower end of the electrode plate 120.

On the other hand, in the present invention, when removing the scale attached to the electrode plate 120 periodically through the ultrasonic generator 160, a predetermined amount of sulfuric acid (H ₂ SO ₄ ) is injected through one side of the reaction chamber 110 This can improve the removal efficiency of the scale. As such, when removing the scale attached to the electrode plate 120, a certain amount of sulfuric acid (H ₂ SO ₄ ) is injected through one side of the reaction chamber 110 to improve the removal efficiency of the scale, as well as inside the reaction chamber 110. It can improve the washing effect.

The following is the result of wastewater treatment through the addition of flocculant according to the characteristics of wastewater.

[Organic Chemical Plant Wastewater (Surfactant Wastewater) Experiment]

In Experiments 1 to 5, ferric sulfate aqueous solution (10%) was added to the organic chemical plant wastewater (surfactant wastewater) as a coagulant and subjected to electrocoagulation. Results according to Experiments 1 to 5 are shown through Tables 1 to 5.

Flocculant (ppm) 1000 5000 10000 20000 Cohesion Inadequate Inadequate slightly
(Supernatant: reddish brown) Cohesion

Coagulant: Ferric sulfate aqueous solution (10%), Reaction time: 30rpm 15 minutes stirring, pH: Neutral preparation after treatment (using 10% caustic soda solution)

Electricity amount (A) 3 5 7 10 Cohesion Inadequate Inadequate slightly
(Supernatant: reddish brown) Good

Flow rate: 1L / min, pH: Neutral snow after treatment (10% caustic soda solution), Electrode plate: Iron

Flocculant 1000 2000 3000 Current amount (A) 5 5 5 Cohesion Inadequate Good Good

Coagulant: Ferric sulfate aqueous solution (10%), Flow rate: 1L / min, Electrode plate: Iron, pH: Neutral snowmaking after treatment (using 10% caustic soda solution)

Flocculant 2000 3000 5000 Current amount (A) 3 3 3 Cohesion Inadequate Inadequate Good

Coagulant: Ferric sulfate aqueous solution (10%), Flow rate: 1L / min, Electrode plate: Iron, pH: Neutral snowmaking after treatment (using 10% caustic soda solution)

Flocculant 1000 2000 3000 Current amount (A) 7 7 7 Cohesion Inadequate Inadequate Poor (supernatant: reddish brown)

Coagulant: Ferric sulfate aqueous solution (10%), Flow rate: 1L / min, Electrode plate: Iron, pH: Neutral snowmaking after treatment (using 10% caustic soda solution)

As shown in Table 1 to Table 5, in Experiment 1, a very large amount of inorganic coagulant is required, and the aggregation state is also not good. In Experiment 2, a large amount of current was consumed to consume a large amount of electrode plates. In Experiment 3, excellent results were obtained with a small amount of flocculant and an appropriate amount of current. Experiment 4 had a low amount of current, and Experiment 5 had a low degree of aggregation due to the amount of current. Therefore, from the results of Experiment 3, excellent aggregates were obtained with an appropriate amount of inorganic coagulant and current amount.

[Dyeing Plant Wastewater Experiment]

In Experiments 6 to 10, ferric sulfate aqueous solution (10%) was added as a coagulant to the dyeing plant wastewater for electrocoagulation. The results according to Experiment 6 to Experiment 10 are shown through Tables 6 to 10.

Flocculant (ppm) 300 500 700 1000 COD (ppm) 122 110 74 85 Removal rate (%) 32.2 38.9 58.9 52.8

Raw water COD: 180ppm, flocculant: ferric sulfate aqueous solution (10%), reaction time: 300rpm 15 minutes stirring, pH: neutral control after treatment (using 10% caustic soda solution)

Current amount (A) 2 3 5 7 COD (ppm) 108 86 70 92 Removal rate (%) 40 52.2 61.1 48.9

Flow rate: 1L / min, pH: neutral control after treatment (using 10% caustic soda solution), electrode plate: iron

Flocculant (ppm) 300 300 300 300 Current amount (A) 2 3 5 7 COD (ppm) 74 62 72 86 Removal rate (%) 58.9 65.6 60.0 52.2

Flow rate: 1L / min, pH: neutral control after treatment (using 10% caustic soda solution), electrode plate: iron

Flocculant (ppm) 200 200 200 200 Current amount (A) 2 3 5 7 COD (ppm) 78 66 58 72 Removal rate (%) 56.7 63.3 67.8 60.0

Flow rate: 1L / min, pH: neutral control after treatment (using 10% caustic soda solution), electrode plate: iron

Flocculant (ppm) 500 500 500 500 Current amount (A) 2 3 5 7 COD (ppm) 68 72 94 126 Removal rate (%) 62.2 60.0 47.8 30.0

As shown in Table 6 to Table 10, in Experiment 6, a very large amount of inorganic coagulant is required, and the COD removal rate is also not good. In Experiment 7, a large amount of current was consumed, which consumes much of the electrode plate. In Experiment 8, excellent results were obtained with a small amount of flocculant and an appropriate amount of current. In Experiment 9, the amount of electricity consumed was increased due to the lack of coagulant input. In Experiment 10, the COD removal rate was low due to the excessive amount of coagulant input. Therefore, as a result of Experiment 8, an excellent COD removal rate was obtained with an appropriate amount of inorganic coagulant and current amount.

[Dong pipe factory wastewater experiment]

In Experiments 11 to 15, polyaluminum chloride aqueous solution (10%) was added to the copper pipe plant wastewater as a coagulant and subjected to electrocoagulation. Results according to Experiment 11 to Experiment 15 are shown through Tables 11 to 15.

Flocculant (ppm) 300 500 700 1000 Fluorine (ppm) 84 78 72 70 Removal rate (%) 32.2 38.9 58.9 52.8

Fluoride ion concentration of raw water: 140ppm stirring, flocculant: polyaluminum chloride aqueous solution (10%), reaction time: 300rpm 15 minutes, pH: neutral control after treatment (using 10% caustic soda solution)

Current amount (A) 2 3 5 7 F (ppm) 32 6 4 4 Removal rate (%) 77.1 95.7 97.1 97.1

Flow rate: 1L / min, pH: neutral control after treatment (using 10% caustic soda solution), electrode plate: aluminum

Flocculant (ppm) 100 100 100 100 Current amount (A) 2 3 5 7 F (ppm) 24 3 3 3 Removal rate (%) 82.8 97.8 97.8 97.8

Flow rate: 1L / min, pH: neutral control after treatment (using 10% caustic soda solution), electrode plate: aluminum

Flocculant (ppm) 10 30 50 70 Current amount (A) 3 3 3 3 F (ppm) 30 22 8 3 Removal rate (%) 78.5 84.2 94.2 97.8

Flow rate: 1L / min, pH: neutral control after treatment (using 10% caustic soda solution), electrode plate: aluminum

Flocculant (ppm) 10 30 50 70 Current amount (A) 4 4 4 4 COD (ppm) 5 4 3 3 Removal rate (%) 96.4 97.1 97.8 97.8

Flow rate: 1L / min, pH: neutral control after treatment (using 10% caustic soda solution), electrode plate: aluminum

As shown in Tables 11 to 15 above, an excessive amount of inorganic coagulant is required in Experiment 11, and the F removal rate is also not good. In experiment 12, excessive current was consumed, and the electrode plate was consumed. According to the results of experiments 13, 14, and 15, an excellent F and COD removal rate was obtained with a proper amount of current after a small amount of inorganic coagulant was administered.

As described above, the technique according to the present invention allows the flocculation of the suspended particles or the emulsion particles and the insoluble particles in the waste water by the addition of the flocculant through the flocculant injector 140, and also the configuration of the ozone generator 150. Through the injection of ozone (O ₃ ), the efficiency of electrocoagulation of wastewater can be improved by improving the color of the wastewater and shortening the removal time of COD, BOD, TSS (solid suspended solids) and TN (total nitrogen). . In addition, it is economically very advantageous and suitable for constructing a large-capacity wastewater treatment device suitable for high concentration wastewater treatment and removal of specific ions (F, Ca, P, Si, Mn, etc.).

The present invention is not limited to the above embodiments, and various modifications can be made within the scope of the technical idea of the present invention.

100. Wastewater Treatment System 110. Reaction Chamber
120. Electrode plate 130. Power supply
140. Coagulant Injector 150. Ozone Generator
160. Ultrasonic Generator

Claims (5)

A wastewater inlet in which wastewater flows in and a treated water outlet in which flocculated treated water flows out are provided, and a reaction chamber in which an electrocoagulation reaction is carried out is arranged. In the wastewater treatment apparatus through the electro-aggregation is provided with an electrode plate for impregnating the particulate contaminants in the waste water and a power supply for supplying power to the electrode plate,
Is installed on the waste water inlet of the reaction chamber, the mixed coagulant or inorganic coagulant and the organic coagulant is mixed in a ratio of 90 ~ 99.9: 0.1 ~ 10% by weight in the waste water flowing into the reaction chamber through the waste water inlet or A flocculant injector which injects and reacts an inorganic flocculant to cause flocculation of suspended particles, emulsion particles and insoluble particles in the wastewater;
An ozone generator for injecting ozone (O ₃₎ generated in the waste water to produce a waste water inlet is provided at one side jidoe ozone (O ₃₎ of the reaction chamber flowing through the waste water inlet; And
Is formed on the inner side of the reaction chamber is made of a configuration including an ultrasonic generator for removing the scale attached to the surface of the electrode plate through the periodic ultrasonic oscillation,
The amount of flocculant is input in the amount of 10 ~ 10,000ppm according to the nature of the wastewater wastewater treatment apparatus through electrocoagulation. The method of claim 1, wherein the inorganic coagulant is selected from one or more selected from the group consisting of ferric polysulfate, ferric sulfate, ferric chloride, aluminum chloride, polyaluminum chloride and aluminum sulfate. Wastewater treatment device. delete delete delete

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