KR20200093740A - Wastewater treatment system using an electrochemical oxidation and a membrane distillation process and wastewater treatment method using the same - Google Patents

Abstract

The present invention relates to an electrochemical oxidation reaction capable of operating a membrane distillation process and an electrochemical oxidation treatment of heat generated from the electrical resistance of water while simultaneously electrochemically oxidizing wastewater, and in electrochemical oxidation. By applying the excess oxidation heat generated simultaneously with the peroxide salt to be produced in the membrane distillation process, there is an advantage in that high-quality fresh water production is possible by using the vapor pressure in the module.

Description

Wastewater treatment system using an electrochemical oxidation and a membrane distillation process and wastewater treatment method using the same}

The present invention relates to a wastewater treatment system using an electrochemical oxidation reaction and a membrane distillation process and a wastewater treatment method using the same.

Conventionally, wastewater has been treated using a chemical treatment method to treat various industrial wastewater. However, when a chemical treatment method is used, a problem of environmental pollution occurs due to an excessively used chemical, and an electrochemical treatment method has recently emerged as an alternative to the environmental pollution problem.

The electrochemical treatment method treats wastewater using an oxidation-reduction reaction of an electrode in an electrolytic cell equipped with an electrode plate of a cathode and an anode, and is effective in removing oil, inorganic pollutants, organic pollutants and colloidal pollutants, and the size of the device. Compared to this, it has the advantage of treating high concentrations of contaminated wastewater.

However, this electrochemical treatment method has a problem of separation of the electrolyte after oxidation treatment because excessive use of electrolyte is inevitable to minimize the heat of resistance of water as a medium. Therefore, there is a need to introduce a separation process capable of electrochemically treating wastewater and easily separating it.

Republic of Korea Publication No. 10-2010-0076815

The present invention is to solve the above-mentioned problems, while electrochemically oxidizing the wastewater and simultaneously treating the wastewater using the electrochemical oxidation reaction and the membrane distillation process capable of operating the heat resulting from the electrical resistance of the water. We want to provide a system.

In addition, to provide a wastewater treatment method using the above-described wastewater treatment device.

In order to achieve the above object,

The present invention, in one embodiment, the electrolytic solution containing a sulfuric acid solution is accommodated, an electrochemical reaction device for performing an electrochemical reaction by introducing an organic wastewater into the electrolyte solution; And

A membrane distillation device that receives the electrolytic solution that has undergone an electrochemical reaction and filters the electrolytic solution through a membrane distillation process; It includes,

The electrochemical reaction device provides a wastewater treatment system characterized by generating persulfate from an electrolytic solution by an electrochemical reaction and generating excess oxidation heat in the reaction tank at the same time.

In addition, the present invention in another embodiment,

Performing an electrochemical reaction by introducing wastewater containing organic matter into an electrolyte solution containing a sulfuric acid solution; And

Supplying the electrolytic solution that has undergone an electrochemical reaction to the membrane distillation apparatus, and filtering the electrolytic solution by a membrane distillation process; It includes,

The step of performing the electrochemical reaction provides a wastewater treatment method characterized by generating persulfate from an electrolytic solution by the electrochemical reaction and generating excess oxidation heat in the electrolytic solution.

According to the wastewater treatment system using the electrochemical oxidation reaction and the membrane distillation process of the present invention and the wastewater treatment method using the same, the electrochemical oxidation reaction and the membrane distillation process can be used. In particular, the electrochemical oxidation reaction includes a sulfuric acid solution. By using an electrolyte, the generation and activation of persulfate is induced, and even if no oxidizing agent is input from the outside, the persulfate can be easily removed by treating the contaminants with electrochemical direct or indirect oxidation.

In addition, by applying the excess oxidation heat generated at the same time as the peroxide salt generated in the electrochemical oxidation to the membrane distillation process, there is an advantage that it is possible to produce high-quality fresh water using the vapor pressure in the module.

1 and 2 are schematic diagrams schematically showing a wastewater treatment system using an electrochemical oxidation reaction and a membrane distillation process of the present invention.
3 is a view showing the membrane distillation process of the membrane distillation apparatus in the wastewater treatment system of the present invention.
4 is a flow chart showing a wastewater treatment method using the wastewater treatment system of the present invention.
5 is a graph showing the temperature of excess production heat during electrochemical oxidation by concentration of Na ₂ SO ₄ .
6 is a graph showing the water permeability of each membrane distillation method.
7 is a graph showing the results of the treatment of contaminants electrochemically using a wastewater treatment system in an embodiment, and the production of fresh water through a membrane distillation process ((a), (b) contaminant treatment according to reaction time Concentration, (c) graph showing water permeability and salt removal rate according to reaction time).

The present invention can be applied to various changes and can have various embodiments, and specific embodiments will be illustrated in the drawings and described in detail in the detailed description.

However, this is not intended to limit the present invention to specific embodiments, and should be understood to include all modifications, equivalents, and substitutes included in the spirit and scope of the present invention. In the description of the present invention, when it is determined that a detailed description of known technologies related to the present invention may obscure the subject matter of the present invention, the detailed description will be omitted.

The terms used in this application are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

In the present invention, terms such as “comprises” or “have” are intended to designate the existence of features, numbers, steps, operations, components, parts, or combinations thereof described in the specification, and one or more other features. It should be understood that the existence or addition possibilities of fields or numbers, steps, operations, components, parts or combinations thereof are not excluded in advance.

The present invention relates to a wastewater treatment system using an electrochemical oxidation reaction and a membrane distillation process and a wastewater treatment method using the same.

In one embodiment, the wastewater treatment system according to the present invention,

The present invention, in one embodiment, the electrolytic solution containing a sulfuric acid solution is accommodated, an electrochemical reaction device for performing an electrochemical reaction by introducing an organic wastewater into the electrolyte solution; And

A membrane distillation device that receives the electrolytic solution that has undergone an electrochemical reaction and filters the electrolytic solution through a membrane distillation process; It includes,

The electrochemical reaction apparatus is characterized in that it generates persulfate from an electrolytic solution by an electrochemical reaction, and at the same time generates excess oxidation heat in the reaction tank.

Prior to the description, the term “electrochemical reaction” among terms used in the present invention relates to a method of treating contaminants in wastewater electrochemically, a direct oxidation process for removing contaminants from an anode, and an electrolyte during electrolysis It may refer to an indirect oxidation process in which pollutants are destroyed by strong oxides such as hypochlorous acid, hydroxyl radicals, and sulfuric acid radicals, which are electrochemically generated therefrom.

In addition, "membrane distillation (Membrane distillation, MD) process" means a separation process based on the movement of steam through a separator having hydrophobic pores using a steam pressure difference as a driving force. In more detail, using a membrane distillation apparatus including a membrane distillation module comprising a separation membrane having a hydrophobic surface and a treated water side through which the treated water flows to selectively permeate only the inflow of the raw water flowing therein, and vapor of the raw water. The process can be carried out. In the present invention, the inflow source water flowing into the inflow water side may be an electrolytic solution that has undergone an electrochemical reaction. On the other hand, the electrolytic solution that has undergone the electrochemical reaction generates excess oxidation heat by the electrochemical reaction, so it is not necessary to separately heat the electrolytic solution when supplied to the film distillation process. According to an embodiment of the present invention, the film distillation process may use a direct contact film distillation process (DCMD).

In the present invention, the term "excess oxidation heat" may mean heat generated during oxidation during the electrochemical reaction. In more detail, in the present invention, electrical energy is converted into thermal energy during electrochemical reaction, and electric resistance heat is generated inside the electrolyte, which may mean heat generated at this time.

Hereinafter, a wastewater treatment system using an electrochemical oxidation reaction and a membrane distillation process of the present invention and a wastewater treatment method using the same will be described in detail with reference to the accompanying drawings.

1 and 2 are schematic diagrams schematically showing a wastewater treatment system using an electrochemical oxidation reaction and a membrane distillation process of the present invention.

1 and 2, the wastewater treatment system 100 using the electrochemical oxidation reaction and the membrane distillation process of the present invention includes an electrochemical reaction apparatus 110 and a membrane distillation apparatus 120. More specifically, the electrochemical reaction device 110 receives an electrolyte solution containing a sulfuric acid solution, and an electrochemical reaction is performed by introducing wastewater containing an organic substance into the electrolyte solution, and the membrane distillation device 120 is electrochemical It is possible to produce fresh water by filtering the electrolyte through a membrane distillation process by receiving the electrolyte solution that has undergone the reaction.

In particular, the electrochemical reaction device 110 may generate persulfate from an electrolytic solution by an electrochemical reaction, and simultaneously generate excess oxidation heat in the electrolytic solution of the reaction tank 111. The electrolyte solution may include a sulfuric acid solution, for example, may include at least one selected from the group consisting of sodium sulfate (Na ₂ SO ₄ ), sodium chloride (NaCl) and sulfuric acid (H ₂ SO ₄ ).

The persulfate can be used as an oxidizing agent for electrochemical reactions. Here, the persulfate may be at least one selected from the group consisting of peroxydisulfagte (PDS) and peroxymonosulfate (PMS) produced by the electrochemical reaction of a sulfuric acid solution. For example, the electrochemical oxidation reaction is easy by generating and activating persulfate by using an electrolytic solution containing a sulfuric acid solution, so that the persulfate treats the contaminants directly or indirectly by oxidizing even if no external oxidizing agent is added. Can be removed.

In addition, excess oxidation heat is generated simultaneously with the persulfate by the electrochemical reaction, which can be applied to the membrane distillation process to produce high-quality fresh water using the vapor pressure in the membrane distillation module. For example, the electrolytic solution that has undergone the electrochemical reaction generates excess oxidation heat by the electrochemical reaction, and the electrolytic solution in which the excess oxidation heat is generated can be supplied to the membrane distillation apparatus 120, so that the electrolytic solution is separately There is no need to heat.

In the present invention, the membrane distillation apparatus 120 may be any type of membrane distillation water treatment apparatus. For example, Direct Contact Membrane Distillation (DCMD), Air Gap Membrane Distillation (AGMD), Vacuum Membrane Distillation (VMD), Gas Flow Membrane Distillation (VMD) Sweep Gas Membrane Distillation (SGMD) method. However, in one embodiment of the present invention, the membrane distillation apparatus 120 may be a direct contact membrane distillation (DCMD) method.

On the other hand, in the conventional direct contact membrane distillation process, as a disadvantage of the hydrophobic membrane, there was a problem in that the water permeation flow rate was reduced due to the contaminant treatment and the membrane contamination, but the wastewater treatment system 100 according to the present invention generates from electrochemical oxidation. By inducing the generation of radical sulfate having strong oxidizing power by using the excess oxidation heat generated by the persulfate at the same time as a medium, it is possible to remove the contaminants generated on the surface of the membrane and maintain the persistence of the membrane.

Next, the electrochemical reaction device 110 of the wastewater treatment system 100 includes a reaction tank 111 containing an electrolyte, and in the reaction tank 111, boron doped diamond (BDD) oxide electrode ( 1111) and a cathode 1112 filled with a metal oxide.

In particular, the boron-doped diamond oxide electrode 1111 has a high oxygen and hydrogen overvoltage as compared to a commonly used Pt electrode, and thus can effectively decompose a hardly decomposable material such as a nitrogen compound. ).

In addition, the metal oxide of the cathode 1112 may be at least one selected from the group consisting of TiO ₂ , UO ₂ , Ta ₂ O ₅ and U ₃ O ₈ , for example, TiO ₂ .

On the other hand, the reaction tank 111 of the electrochemical reaction device 110 may further include a stirring means such as a magnetic stirrer for mixing the electrolyte.

The electrolytic solution that has undergone the electrochemical reaction may be supplied to the membrane distillation device 120 and used for fresh water production. 3 is a view showing in detail the membrane distillation process of the membrane distillation apparatus 120.

Referring to FIG. 3, the membrane distillation apparatus 120 includes a separator 121 and an electrolyte region 122 provided on one surface of the separator 121 and supplied with an electrolyte heated by excess oxidation heat; And a cooling water region 123 provided on the other surface of the separator 121 and supplied with cooling water. Particularly, moisture in the electrolyte is evaporated by the temperature difference between the electrolyte supplied to the electrolyte region 122 and the cooling water supplied to the cooling water region 123, and then passes through the separator 121 to move the fluid to the cooling water region 123. Is done. More specifically, due to the difference in vapor pressure generated between the electrolyte heated by the excess oxidation heat and cooling water, moisture in the electrolyte evaporates and passes through the hydrophobic separator 121 to move the fluid to the cooling water region 123. In addition, the electrolyte in which water is evaporated is circulated to the reaction tank 111 of the electrochemical reaction device 110.

In addition, the membrane distillation apparatus 120 further includes a cooling water storage tank 124 for storing cooling water, and the cooling water stored in the cooling water storage tank 124 is fluidly moved to the cooling water region 123, and in the cooling water region 123. The electrolyte that has passed through the separator 121 is characterized in that the fluid is moved to the cooling water storage tank 124.

Meanwhile, the electrolyte solution supplied to the electrolyte solution supply unit 122 may be 40 to 70°C, and may be 40 to 60°C or 50°C. If the temperature of the electrolyte supplied to the electrolyte region 122 of the membrane distillation apparatus 120 is less than 40° C., the temperature difference between the electrolyte region 122 and the cooling water region 123 is too small to generate vapor pressure. Steam movement through the separator 121 may not be performed, and freshwater production may be difficult. In addition, when the temperature of the electrolyte supplied to the electrolyte supply unit 122 of the membrane distillation device 120 exceeds 70°C, energy consumption may be high and energy efficiency may not be good.

In addition, the temperature of the cooling water supplied to the cooling water area 123 may be 15 to 25°C, or 20°C, and an additional cooling means 124' is connected to the cooling water area 123 to cool the cooling water at a predetermined temperature. Can be kept as

For example, the electrolyte in the reaction tank is heated to 70° C. by excess oxidation heat, and the temperature of the initial electrolyte supplied to the electrolytic zone region 122 of the film distillation device may be 70° C., By the heat exchange between the electrolytic zone region 122 and the cooling water region 123, the temperature of the electrolyte circulating in the electrolytic zone region 122 can maintain an average temperature of 50 to 60°C.

The cooling water area 123 and the cooling water storage tank 124 may be connected to a circulation pipe, so that the fluid in the cooling water area 123 and the cooling water storage tank 124 may be fluidly moved. In particular, a cooling water pump 125 is installed in the circulation pipe to control a flow rate or flow rate of cooling water flowing into the cooling water region 123.

Furthermore, the reaction tank 111 of the electrochemical reaction device 110 and the electrolyte region 122 are also connected by a circulation pipe to be circulated, and an electrolyte pump 115 is also installed in the circulation pipe. The fluid can be moved to circulate the fluid.

In addition, each circulation pipe connected to the electrochemical reaction device 110 and the membrane distillation device 120 may include a temperature measurement means, and measure the temperature of the electrolyte and the cooling water in real time.

On the other hand, the separator 121 is a hydrophobic membrane polyvinylidene fluoride (PVDF: Poly Vinylidene Flouride), polyethylene (PE: Poly Ethylene), polypropylene (PP: Poly Propylene), and polytetrafluoroethylene (PTFE: Polytetrafluoroethylene) may be at least one selected from the group consisting of, for example, the separator 121 may be polyvinylidene fluoride (PVDF: Poly Vinylidene Flouride).

Hereinafter, the process of the membrane distillation apparatus will be described in detail.

Cooling water supplied from the cooling water storage tank 124 is supplied to the cooling water region 123 of the membrane distillation apparatus 120. At this time, the electrolyte supplied to the electrolyte solution region 122 of the membrane distillation apparatus 120 is adjusted to room temperature of 40 to 70°C, and the cooling water supplied to the cooling water area 123 is set to 20°C.

When the high temperature electrolyte solution and the low temperature cooling water come into contact with the separation membrane 121 interposed therebetween, the moisture in the electrolyte solution evaporates and passes through the separation membrane 121 due to a difference in temperature between the electrolyte solution and the cooling water, and moves to the cooling water region 123 Finally, it is moved to the cooling water storage tank 124 and can be used for fresh water production. In addition, the electrolytic solution in which moisture is evaporated is circulated back to the reaction tank of the electrochemical reaction device 110. In proceeding with the membrane distillation process, the reason for controlling the temperature of the raw water to 40 ~ 70 ℃ is to increase the freshwater production rate.

4 is a flow chart showing a wastewater treatment method using the wastewater treatment system 100 of the present invention. Referring to Figure 4, it will be described in detail the wastewater treatment method according to the present invention.

In another embodiment, the present invention is a step of performing an electrochemical reaction by injecting wastewater containing organic matter into an electrolyte solution containing a sulfuric acid solution (S110); And

Supplying the electrolytic solution that has undergone an electrochemical reaction to the membrane distillation apparatus 120, and filtering the electrolytic solution by a membrane distillation process (S120); It provides a wastewater treatment method comprising a.

The step (S110) of performing the electrochemical reaction is characterized in that a persulfate is generated from the electrolytic solution by the electrochemical reaction, and at the same time, excess heat of oxidation is generated in the electrolytic solution. In particular, the membrane distillation apparatus 120 may be supplied with an electrolytic solution that has undergone an electrochemical reaction to filter the electrolyte through a membrane distillation process to produce fresh water.

More specifically, the step of performing an electrochemical reaction (S110) is an electrochemical reaction of an electrolytic solution containing a sulfuric acid solution to generate a persulfate and excess heat of oxidation, and a persulfate and an excess heat of oxidation generated It may include the step of removing the organic matter in the wastewater by introducing the wastewater containing the organic matter. In particular, the persulfate may act as an oxidizing agent for the electrochemical reaction.

That is, in the electrochemical oxidation reaction, the generation and activation of persulfate is induced by using an electrolytic solution containing a sulfuric acid solution, so that the persulfate is easily removed by treating the contaminants with electrochemical direct or indirect oxidation, even if no external oxidizing agent is added. can do.

In addition, excess oxidation heat is generated simultaneously with the persulfate by the electrochemical reaction, which can be applied to the membrane distillation process to produce high-quality fresh water using the vapor pressure in the membrane distillation module. For example, the electrolytic solution that has undergone the electrochemical reaction generates excess oxidation heat by the electrochemical reaction, and the electrolytic solution in which the excess oxidation heat is generated can be supplied to the membrane distillation apparatus 120, so that the electrolytic solution is separately There is no need to heat.

At this time, the electrolyte supplied to the membrane distillation apparatus 120 may be in the range of 40 to 70 ℃.

Next, the step of filtering the electrolyte by the membrane distillation process, the step of circulating the electrolyte in the electrochemical reaction apparatus 110 in which excess heat of oxidation is generated in the electrolytic zone region 122 of the membrane distillation apparatus 120, cooling water The water in the electrolyte is evaporated by the temperature difference between the circulating coolant in the region 123 and the coolant in the electrolyte region 122 and the coolant in the coolant region 123 to pass through the separator 121 to the coolant region 123 And moving the fluid.

The moisture permeated into the coolant region 123 is condensed again and fluid is transferred to the coolant reservoir 124 to be used for fresh water production. Since the specific method of driving the film distillation process is as described above, a detailed description will be omitted.

Hereinafter, the present invention will be described through the following experimental examples. However, the experimental examples are intended to specifically describe the present invention, and the scope of the present invention is not limited to the following experimental examples.

<Experimental Example>

Experimental Example 1. Measurement of surplus production heat of electrochemical reaction

In this experiment, a boron doped diamond (BDD) electrode having a size of ₂ cm x 6 cm was used as the anode, and a TiO ₂ electrode having a size of ₂ cm x 6 cm was used as the cathode.

The electrochemical reaction is sodium sulfate (Na ₂ SO ₄₎ was carried out in solution, in particular, perchlorate no chemical reactivity because since the best electrolysis efficiency in acidic conditions (perchlorate, ClO ₄ ^-) to an acidic condition by using (pH5 ). The volume of the electrolyte was 500 ml, and the concentrations of Na ₂ SO ₄ were 0.125M, 0.25M, 0.5M, and 1M.

Next, a current density of 100 mA/cm ² was applied to the electrode, and an experiment for measuring excess production heat of the electrolyte solution was performed for 4 hours. Then, the temperature of the electrolytic solution according to the reaction time was measured, and shown in FIG. 5.

5 is a graph showing the temperature of excess production heat during electrochemical oxidation by concentration of Na ₂ SO ₄ . Referring to Figure 5, it can be seen that the temperature increases as the reaction time increases.

It seems that the temperature of the electrolyte increased due to excess heat generated during the electrolysis of Na ₂ SO _{4 in} the electrolyte.

Experimental Example 2. Measurement of water flux in membrane distillation process

The water permeability of the membrane distillation process was measured using a self-made membrane distillation module (see FIG. 6). At this time, a hydrophobic separator made of PVDF was used as the separator, and the device was stabilized by injecting DI-water into the electrolyte region for 30 minutes before measuring the water permeability.

Next, 20 °C of cooling water was introduced into the coolant region of the membrane distillation module, and 50 °C, 60 °C, and 70 °C of electrolyte were introduced into the electrolytic solution to measure the water permeability for 1 hour, respectively. At this time, the flow rate of the liquid flowing into each region was 500 ml/min.

And, FIG. 6 is a graph showing the water flux according to the temperature of the membrane distillation process (FIG. 6 ).

Referring to FIG. 6, it can be seen that the greater the temperature difference between the electrolyte solution region and the coolant region, the higher the water permeability.

Experimental Example 3. Pollution treatment and freshwater production measurement

In this experiment, a boron doped diamond (BDD) electrode having a size of ₂ cm x 6 cm was used as the anode, and a TiO ₂ electrode having a size of ₂ cm x 6 cm was used as the cathode.

The electrochemical reaction is sodium sulfate (Na ₂ SO ₄₎ was carried out in solution, in particular, perchlorate no chemical reactivity because of the most excellent electrolytic efficiency in acidic conditions (perchlorate, ClO ₄ ^-) to an acidic condition by using (pH 5 , ). In addition, a Na ₂ SO ₄ solution of 0.25M concentration was used as the electrolytic solution, and the volume was 500 ml.

Next, an electrochemical reaction was performed by applying a current density of 100 mA/cm ^{2 to} the electrode.

When the temperature of the electrolyte reached 50° C., crystal violet (100 ppm) was added as a non-degradable contaminant in the electrolyte, and electrochemical reaction was performed for 3 hours. And, the treatment concentration of the pollutant according to the reaction time is shown in Figure 7 (a), (b).

7(a) and (b), it was confirmed that the crystal violet was effectively removed within a reaction time of about 60 minutes. This is an electrochemical oxidation, and it is judged that the generated persulfate is easily removed by treating the contaminants with electrochemical direct or indirect oxidation even though the generation and activation of persulfate is induced and no oxidizing agent is input from the outside.

In addition, when excess heat was generated in the electrochemical reaction, a membrane distillation process was performed using a membrane distillation module manufactured by using an electrolyte in which excess heat of oxidation was generated. At this time, the temperature and flow rate of the electrolyte provided by the membrane distillation module were 50°C and 350 ml/min, respectively, and the temperature and flow rate of cooling water injected into the coolant area were 20°C and 450 ml/min, respectively. At this time, a difference in vapor pressure occurred inside the membrane distillation module, and moisture in the electrolyte solution region evaporated and penetrated the separation membrane. The moisture that passed through the separator was produced as fresh water through the cooling water region.

Figure 7 (c) is a graph showing the water permeability and salt removal rate according to the reaction time. Referring to Figure 7 (c), it can be seen that the water permeability does not change even after time. On the other hand, as a disadvantage of the hydrophobic film used in the conventional direct contact type film distillation process, there was a problem in that the water permeation flow rate was reduced due to membrane contamination when treating contaminants, but in the electrochemical-membrane distillation process according to the present invention, electrochemical oxidation Inducing the generation of radical sulfate (E0=2.5V) with strong oxidizing power by using the excess heat generated by peroxydisulfate (PDS) at the same time as a medium to remove contaminants generated on the surface of the film and maintain the durability of the film. I think it can.

In addition, it is judged that high-quality fresh water production is possible by using the vapor pressure in the module by applying the surplus resistance heat energy generated by electrochemical oxidation without a heat source to the direct contact membrane distillation method (DCMD).

100: wastewater treatment system
110: electrochemical reaction device
111: reactor
1111: anode 1112: cathode
115: electrolyte pump
120: membrane distillation device
121: separator
122: electrolyte region 123: cooling water region
124: cooling water storage tank 124': cooling means
125: coolant pump

Claims (12)

An electrochemical reaction device in which an electrolyte solution containing a sulfuric acid solution is accommodated, and an electrochemical reaction is performed by introducing wastewater containing an organic substance into the electrolyte solution; And
A membrane distillation device that receives the electrolytic solution that has undergone an electrochemical reaction and filters the electrolytic solution through a membrane distillation process; It includes,
The electrochemical reaction device, a wastewater treatment system characterized in that to generate a persulfate from the electrolytic solution by an electrochemical reaction, and at the same time generate excess oxidation heat in the electrolytic solution.
According to claim 1,
Wastewater treatment system, characterized in that persulfate is used as an oxidizing agent for electrochemical reactions.
According to claim 1,
The electrochemical reaction apparatus includes a reaction tank for receiving an electrolytic solution, and a wastewater treatment system comprising a boron doped diamond (BDD) oxide electrode and a metal oxide filled cathode in the reaction tank.
According to claim 3,
The metal oxide is a wastewater treatment system, characterized in that at least one selected from the group consisting of TiO ₂ , UO ₂ , Ta ₂ O ₅ and U ₃ O ₈ .
According to claim 1,
The membrane distillation device,
Separators;
An electrolyte region provided on one side of the separator and supplied with an electrolyte heated by excess oxidation heat; And
It is provided on the other surface of the separator and includes a cooling water region to which cooling water is supplied,
Due to the difference in vapor pressure generated between the electrolyte heated by the excess oxidation heat and the cooling water, moisture in the electrolyte evaporates and passes through the hydrophobic separator to move the fluid to the cooling water region, and the evaporated water moves into the electrochemical reaction device. Wastewater treatment system, characterized in that.
The method of claim 5,
The membrane distillation apparatus further includes a cooling water storage tank for storing cooling water,
The cooling water stored in the cooling water storage tank, the fluid is moved to the cooling water region, the electrolyte solution that has passed through the separator in the cooling water region is characterized in that the fluid is moved to the cooling water storage tank.
The method of claim 5,
Wastewater treatment system, characterized in that the electrolyte supplied to the electrolyte supply is in the range of 40 to 70 ℃.
The method of claim 5,
The separator is at least selected from the group consisting of polyvinylidene fluoride (PVDF), poly ethylene (PE), poly propylene (PP) and polytetrafluoroethylene (PTFE). Wastewater treatment system characterized by being one.
Performing an electrochemical reaction by introducing wastewater containing organic matter into an electrolyte solution containing a sulfuric acid solution; And
Supplying the electrolytic solution that has undergone electrochemical reaction to the membrane distillation apparatus, and filtering the electrolytic solution by a membrane distillation process; It includes,
In the step of performing the electrochemical reaction, a wastewater treatment method characterized by generating persulfate from an electrolytic solution by the electrochemical reaction and generating excess oxidation heat in the electrolytic solution at the same time.
The method of claim 9,
The step of performing the electrochemical reaction may include electrochemical reaction of the electrolyte solution containing the sulfuric acid solution to generate persulfate and excess heat of oxidation; And
Removing organic substances in the wastewater by introducing wastewater containing organic substances into the electrolyte solution in which persulfate and excess oxidation heat are generated; It includes,
The persulfate is a wastewater treatment method characterized in that it acts as an oxidizing agent of the electrochemical reaction.
The method of claim 9,
A method of treating wastewater, characterized in that the electrolyte supplied to the membrane distillation apparatus is in the range of 40 to 70°C.
The method of claim 9,
The step of filtering the electrolyte by the membrane distillation process,
Circulating the electrolyte solution in the electrochemical reactor in which excess heat of oxidization is generated to the electrolyte solution area of the membrane distillation apparatus;
Circulating coolant into the coolant zone; And
A step of evaporating moisture in the electrolytic solution due to a temperature difference between the electrolytic solution in the electrolytic solution area and the cooling water in the coolant area and passing through the separator to move the fluid to the coolant area; Wastewater treatment method comprising a.

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