Livestock wastewater treatment system using biological process and electrochemical membrane separation device

Abstract

The present invention relates to a livestock wastewater treatment system using a biological process and an electrochemical membrane separation device capable of effectively removing high concentrations of ammoniacal nitrogen contained in livestock wastewater while minimizing the power consumed for ammoniacal nitrogen removal. The livestock wastewater treatment system using a biological process and an electrochemical membrane separation device according to the present invention comprises: a livestock wastewater pretreatment tank for digesting livestock wastewater; a biological water treatment device that removes ammoniacal nitrogen contained in livestock wastewater through nitrification and denitrification reactions, using livestock wastewater that has passed through the livestock wastewater pretreatment tank as the target water for treatment; a pretreatment device that removes impurities contained in livestock wastewater using livestock wastewater that has passed through the biological water treatment device as the target water for treatment to produce pretreated water; and a reverse osmosis membrane module that separates the pretreated water into treated water and concentrated water through a reverse osmosis membrane process. The device is characterized by comprising an electrochemical separation device that uses the concentrated water of a reverse osmosis membrane module as the water to be treated, and converts and recovers ammonium ions (NH4+) contained in the concentrated water into ammonia gas (NH3) through an electrochemical reaction.

Description

Technology Field

[0001] The present invention relates to a livestock wastewater treatment system using a biological process and an electrochemical membrane separation device, and more specifically, to a livestock wastewater treatment system using a biological process and an electrochemical membrane separation device capable of effectively removing high concentrations of ammoniacal nitrogen contained in livestock wastewater while minimizing the power consumed for ammoniacal nitrogen removal.

[0002] This invention received research and development support (D2403006) from the Gyeonggi-do Technology Development Project.

[0003] [Project ID] D2403006

[0004] [Ministry Name] Gyeonggi-do, Enterprise-led (General_First Step)

[0005] [Specialized Research Management Agency] Gyeonggi Economic & Science Promotion Agency

[0006] [Research Project Name] Gyeonggi-do R&D First Step Corporate Research Institute Support Project

[0007] [Research Project Title] Development of Carbon-Reducing Membrane Modules and Systems for Ammonia Recovery from Wastewater

[0008] [Contribution Rate] 1 / 1

[0009] [Lead Research & Development Organization] Uwatech Co., Ltd.

[0010] [Research Period] 2024.08.01 - 2026.07.31 Background Technology

[0011] Biological processes and ammonia degassing methods can be considered appropriate treatment methods for high concentrations of ammonia nitrogen (NH3-N) contained in livestock wastewater. Biological processes are methods that remove ammonia nitrogen through nitrification and denitrification using microorganisms, while ammonia degassing methods remove ammonium ions (NH4) present in water + This is a method of converting ) into ammonia gas (NH3) and then recovering the ammonia gas using air.

[0012] Biological processes have the advantages of low operating costs and environmental friendliness, but they suffer from the problem of fluctuating treatment efficiency depending on operating conditions. Additionally, while the ammonia degassing method is suitable for removing high concentrations of ammoniacal nitrogen, it has the disadvantages of using large amounts of NaOH for pH control and consuming a significant amount of electricity for air supply.

[0013] Korean Registered Patent No. 496122 (Patent Document 1) discloses a technology for removing ammoniacal nitrogen through a biological process, and Korean Registered Patent No. 414917 (Patent Document 2) discloses a technology combining ammonia degassing and a biological process. Prior art literature

[0014] Korean Patent Publication No. 496122 (Published June 16, 2005) Korean Patent Publication No. 414917 (Published January 13, 2004) The problem to be solved

[0015] The present invention has been devised to solve the aforementioned problems and aims to provide a livestock wastewater treatment system utilizing a biological process and an electrochemical membrane separation device that can effectively remove high concentrations of ammoniacal nitrogen contained in livestock wastewater while minimizing the power consumed for ammoniacal nitrogen removal. means of solving the problem

[0016] A livestock wastewater treatment system using a biological process and an electrochemical membrane separation device according to the present invention for achieving the above objective comprises: a livestock wastewater pretreatment tank for digesting livestock wastewater; a biological water treatment device that uses livestock wastewater that has passed through the livestock wastewater pretreatment tank as the target water for treatment, removes ammoniacal nitrogen contained in the livestock wastewater through nitrification and denitrification reactions, and removes impurities contained in the livestock wastewater; a pretreatment device that uses livestock wastewater that has passed through the biological water treatment device as the target water for treatment, removes impurities contained in the livestock wastewater to produce pretreated water; a reverse osmosis membrane module that separates the pretreated water into treated water and concentrated water through a reverse osmosis membrane process; and using the concentrated water of the reverse osmosis membrane module as the target water for treatment, the ammonium ions (NH4) contained in the concentrated water + It is characterized by comprising an electrochemical membrane device that converts ) into ammonia gas (NH3) and recovers it through an electrochemical reaction.

[0017] The electrochemical membrane device is an ammonium ion (NH4 + An ammonia recovery reaction tank filled with raw water containing ), and power is applied, and when power is applied, ammonium ions (NH4) in the water + It comprises an ammonia recovery membrane module that converts ) into ammonia gas (NH3) and recovers the converted ammonia gas (NH3), an ammonia recovery chamber that is closely attached to one side of the ammonia recovery membrane module and finally recovers the ammonia gas (NH3) that has passed through the ammonia recovery membrane module, and a cathode to which power is applied.

[0018] The ammonia recovery membrane module has a structure in which a membrane heating layer, an ammonia separation layer, and an ammonia conversion induction layer are sequentially stacked on an ammonia recovery layer; the membrane heating layer and the ammonia conversion induction layer are electrically connected to act as an anode and form a porous structure, while the ammonia separation layer and the ammonia recovery layer function as gas separation membranes capable of facilitating the movement of ammonia gas.

[0019] When power is applied to the separator heating layer, the ammonia conversion inducing layer, and the cathode, hydroxide ions (OH) on the surface of the ammonia conversion inducing layer - ) is generated, and hydroxide ions (OH) - Ammonium ions (NH4) near the surface of the ammonia conversion-inducing layer due to ) generation + This is converted into ammonia gas (NH3), and the converted ammonia gas (NH3) sequentially passes through the porous structure ammonia conversion inducing layer, the pores of the ammonia separation layer, the porous structure separation membrane heating layer, and the pores of the ammonia recovery layer.

[0020] When power is applied, the temperature of the membrane heating layer rises due to Joule heating, and the heat from the membrane heating layer is transferred to the ammonia separation layer and ammonia recovery layer adjacent to the membrane heating layer, causing the temperature of the ammonia separation layer and ammonia recovery layer to rise, and the speed of movement of ammonia gas passing through the ammonia separation layer and ammonia recovery layer increases due to the rise in temperature of the ammonia separation layer and ammonia recovery layer.

[0021] An ammonia separation layer is interposed between the ammonia conversion induction layer and the membrane heating layer, and since the area of ​​the ammonia separation layer is relatively small, physical contact and electrical connection between the ammonia conversion induction layer and the membrane heating layer are possible.

[0022] The ammonia recovery chamber is provided with a collection space for ammonia gas (NH3) and has a three-dimensional structure with one side open. The open portion is provided in close contact with one side of the ammonia recovery layer. Ammonia gas (NH3) generated on the surface of the ammonia conversion induction layer and passing through the ammonia separation layer, the membrane heating layer, and the ammonia recovery layer in sequence is finally recovered in the ammonia recovery chamber. The pressure inside the ammonia recovery chamber is set to be lower than the pressure acting on the ammonia recovery membrane module.

[0023] The electrochemical membrane device is an ammonium ion (NH4 +An ammonia recovery reaction tank filled with raw water containing ), and power is applied, and when power is applied, ammonium ions (NH4) in the water + The apparatus comprises an ammonia recovery membrane module that converts the ammonia gas (NH3) into ammonia gas (NH3) and recovers the converted ammonia gas (NH3), an acidic solution tank provided on one side of the ammonia recovery reaction tank that recovers the ammonia gas (NH3) that has passed through the ammonia recovery layer in the form of salt, and a cathode to which power is applied; wherein the acidic solution of the acidic solution tank is any one of nitric acid solution, sulfuric acid solution, and phosphoric acid solution, and when ammonia gas (NH3) is supplied to the acidic solution of the acidic solution tank, the ammonia gas (NH3) reacts with any one of nitric acid, sulfuric acid, and phosphoric acid to form any one of ammonium nitrate, ammonium sulfate, and ammonium phosphate in the acidic solution, and any one of ammonium nitrate, ammonium sulfate, and ammonium phosphate in the acidic solution can be used as fertilizer.

[0024] The pretreatment device comprises: a raw water tank for storing livestock wastewater that has passed through an aerobic tank as raw water; a raw water pipe for supplying raw water from the raw water tank to a raw water supply pipe; a plurality of raw water supply pipes branched from the raw water pipe and supplying raw water supplied from the raw water pipe to a membrane module; a plurality of pretreatment membrane modules connected to each raw water supply pipe and filtering the raw water supplied from the raw water supply pipe to produce pretreated water; a plurality of pretreated water pipes provided at one end of the pretreatment membrane module for discharging pretreated water produced by the pretreatment membrane module; a pretreated water collection pipe connected to each pretreatment water pipe for collecting pretreated water produced by the plurality of pretreatment membrane modules; a backwash water discharge pipe provided corresponding to each raw water supply pipe for discharging backwash water discharged from the pretreatment membrane module; and a pipe connector on the raw water pipe side, a pipe connector on the raw water supply pipe side, and a pipe connector on the backwash water discharge pipe side. It comprises a control unit that controls the opening and closing operation of a three-way valve and each pipe connection port of the three-way valve, which mediates the connection of the raw water pipe, the raw water supply pipe, and the backwash water discharge pipe, so that the <execution of a filtration process> or <simultaneous execution of a filtration process and a backwash process> is carried out.

[0025] The <execution of the filtration process> and the <simultaneous execution of the filtration process and the backwashing process> are repeated, and the control unit causes the <simultaneous execution of the filtration process and the backwashing process> to proceed when the backwashing cycle arrives or when the difference between the pressure of the raw water and the pressure of the pre-treated water exceeds a preset standard value.

[0026] <Implementation of the filtration process> proceeds as follows: with the pipe connection port on the raw water pipe side of the 3-way valve open and the pipe connection port on the backwash water discharge pipe side closed, the raw water in the raw water pipe is supplied to each pretreatment membrane module through the raw water supply pipe, the pretreatment membrane module performs a filtration process on the raw water to produce pretreated water, the produced pretreated water is discharged through the pretreated water pipe and collected in the pretreated water collection pipe, and the pretreated water collected in the pretreated water collection pipe is supplied to the reverse osmosis membrane module side.

[0027] <Simultaneous execution of filtration and backwashing processes> is carried out in a manner where the backwashing process is performed sequentially for each pretreatment membrane module, and the filtration process is performed on the remaining pretreatment membrane modules, excluding the pretreatment membrane module for which the backwashing process is performed.

[0028] The three-way valve corresponding to the membrane module where the backwashing process is performed has the pipe connection on the raw water side closed while the pipe connection on the backwash water discharge side is open, and the three-way valve corresponding to each of the remaining membrane modules where the filtration process is performed has the pipe connection on the raw water side open while the pipe connection on the backwash water discharge side is closed; when raw water is supplied to the raw water pipe, pretreated water is produced in each of the remaining pretreatment membrane modules, excluding the pretreatment membrane module where the backwashing process is performed, and the produced pretreated water passes through the pretreated water pipe and is collected in the pretreated water collection pipe; the pretreated water collected in the pretreated water collection pipe has a certain pressure, and due to the pressure difference between the pretreated water collected in the pretreated water collection pipe and the pretreatment membrane module where the backwashing process is performed, the pretreated water collected in the pretreated water collection pipe is supplied to the pretreatment membrane module where the backwashing process is performed through the pretreated water pipe, and the supplied The backwashing process of the pretreatment membrane module is carried out using pretreatment water, and the backwash water, which is the pretreatment water used in the backwashing process, proceeds through the raw water supply pipe and the three-way valve to be discharged into the backwash water discharge pipe.

[0029] The biological water treatment device is equipped with a reaction tank, and the lower part of the reaction tank is divided into an anaerobic zone and the upper part of the reaction tank into an aerobic zone. A portion of the livestock wastewater in the aerobic zone is returned to the anaerobic zone or the livestock wastewater pretreatment tank, and a nitrification process in which ammonia nitrogen is converted into nitrate nitrogen proceeds in the aerobic zone, and a denitrification process in which nitrate nitrogen is converted into nitrogen proceeds in the anaerobic zone.

[0030] A carrier is provided in the anaerobic zone on which anaerobic microorganisms attach and grow, and aerobic microorganisms are provided in the aerobic zone; in the anaerobic zone, at least one of bacteria, heavy metals, and antibiotics contained in livestock wastewater is removed by the anaerobic microorganisms, and in the aerobic zone, organic matter contained in livestock wastewater is decomposed.

[0031] A microbubble supply device is further provided on one side of the livestock wastewater pretreatment tank to supply microbubbles to the livestock wastewater treatment tank, and the oxygen transfer rate is increased by the supply of microbubbles, thereby promoting the oxidation and decomposition of organic matter contained in the livestock wastewater. Effects of the invention

[0032] The livestock wastewater treatment system using a biological process and an electrochemical membrane separation device according to the present invention has the following effects.

[0033] Since ammonia nitrogen is primarily removed by a biological water treatment device and residual ammonia nitrogen is removed by an electrochemical membrane device, high concentrations of ammonia nitrogen contained in livestock wastewater can be effectively removed with low power consumption.

[0034] In addition, when treating livestock wastewater through a pretreatment device, the backwashing process is carried out simultaneously with the filtration process, and since a portion of the pretreated water produced in the filtration process is supplied as backwash water, the backwashing process can be performed without a pretreatment tank, thereby simplifying the device configuration and reducing maintenance costs. Brief explanation of the drawing

[0035] FIG. 1 is a diagram showing the configuration of a livestock wastewater treatment system using a biological process and an electrochemical membrane separation device according to one embodiment of the present invention. Figure 2 is a diagram showing the configuration of an electrochemical membrane device. Figure 3 is a schematic diagram of an ammonia recovery membrane module. Figures 4 to 6 are configuration diagrams of a preprocessing device. FIG. 7a is a reference diagram for explaining the <implementation of the filtration process>, and FIG. 7b is a reference diagram for explaining the <simultaneous implementation of the filtration process and the backwashing process>. FIG. 8 is a photograph of an electrochemical membrane device manufactured according to one embodiment of the present invention. Figure 9 is a photograph showing the temperature change of the ammonia recovery membrane module according to the application of power. Figure 10 shows the experimental results regarding the amount of raw water evaporated according to the temperature of the ammonia recovery membrane module. Specific details for implementing the invention

[0036] The present invention provides a technology capable of effectively removing high concentrations of ammoniacal nitrogen contained in livestock wastewater while minimizing power consumption.

[0037] The present invention provides a two-stage process for removing ammoniacal nitrogen. The first stage is removal by a biological process, and the second stage is removal by an electrochemical membrane device.

[0038] As described above in 'Technology Forming the Background of the Invention,' biological processes based on nitrification and denitrification are environmentally friendly and have low operating costs, but treatment efficiency can fluctuate depending on operating conditions. Additionally, while the ammonia degassing method is suitable for removing high concentrations of ammoniacal nitrogen, it has the problem of requiring a large amount of NaOH and high power consumption during operation.

[0039] The present invention provides a technology that primarily removes ammoniacal nitrogen contained in livestock wastewater through a biological process and treats residual ammoniacal nitrogen not treated by the biological process through an electrochemical membrane separation device. Although the biological process may be less efficient in removing high concentrations of ammoniacal nitrogen compared to the ammonia degassing method, it can remove untreated ammoniacal nitrogen through a subsequent electrochemical membrane separation device.

[0040] The electrochemical membrane device applied in this invention is a device that converts and recovers ammonium ions in water into ammonia gas, and is capable of operating with significantly less power compared to the power consumption required for conventional ammonia degassing methods. Therefore, through the combination of the biological process and the electrochemical membrane device of this invention, not only can high concentrations of ammoniacal nitrogen be effectively removed, but power consumption can also be minimized.

[0041] Furthermore, the present invention provides a technology for treating livestock wastewater through a biological process and an electrochemical membrane separation device, wherein a reverse osmosis membrane module is installed between the biological process and the electrochemical membrane separation device to produce treated water from the livestock wastewater, and a pretreatment device that does not require a backwash water supply is installed upstream of the reverse osmosis membrane module, thereby improving the efficiency of the device configuration to enhance the efficiency of treated water production by the reverse osmosis membrane module. Meanwhile, the electrochemical membrane separation device uses the concentrated water discharged from the reverse osmosis membrane module as the target water for treatment, converting and recovering ammonium ions contained in the concentrated water into ammonia gas.

[0042] Hereinafter, a livestock wastewater treatment system using a biological process and an electrochemical membrane separation device according to one embodiment of the present invention will be described in detail with reference to the drawings.

[0043] Referring to FIG. 1, a livestock wastewater treatment system using a biological process and an electrochemical separation membrane device (50) according to one embodiment of the present invention comprises a livestock wastewater pretreatment tank (10), a biological water treatment device (20), a pretreatment device (30), a reverse osmosis membrane module (40), and an electrochemical separation membrane device (50).

[0044] The livestock wastewater pretreatment tank (10) plays the role of digesting livestock wastewater to decompose organic matter contained in the livestock wastewater. On one side of the livestock wastewater pretreatment tank (10), a microbubble supply device (60) is provided to supply microbubbles to the livestock wastewater pretreatment tank (10). By supplying microbubbles, the oxygen transfer rate is improved, thereby promoting the oxidation and decomposition of organic matter and reducing power consumption. The livestock wastewater digested in the pretreatment, i.e., the digestate, is transferred to the anaerobic tank of the biological water treatment device (20).

[0045] The biological water treatment device (20) serves to reduce ammoniacal nitrogen (NH4-N) contained in livestock wastewater into nitrogen gas (N2) through nitrification and denitrification based on an anaerobic tank and an aerobic tank. In addition, the biological water treatment device (20) serves to remove bacteria, heavy metals, and antibiotics contained in livestock wastewater, and to reduce the organic load.

[0046] The configuration of the anaerobic tank and the aerobic tank can be implemented in various forms. Typically, the anaerobic tank and the aerobic tank are configured individually to have independent spaces, but since the present invention is a method in which primary ammonia nitrogen removal by a biological water treatment device (20) and secondary ammonia nitrogen removal by an electrochemical membrane separation device (50) proceed, even if the ammonia nitrogen removal efficiency by the biological water treatment device (20) is designed to be somewhat lower, the ammonia nitrogen is removed by the electrochemical membrane separation device (50) at the rear, so the device configuration can be simplified by providing both the anaerobic tank and the aerobic tank together in a single reaction tank. In one embodiment, as shown in FIG. 1, the lower part of the reaction tank may be divided into an anaerobic zone (21), and the upper part of the reaction tank may be divided into an aerobic zone (22). In this case, livestock wastewater in the anaerobic area (21) of the reaction tank can be anaerobic and livestock wastewater in the aerobic area (22) of the reaction tank can be aerobic by supplying air only to the aerobic area (22) while livestock wastewater is supplied to the anaerobic area (21) of the reaction tank. Of course, it is also possible to configure the anaerobic tank and the aerobic tank independently. The anaerobic area (21) (or anaerobic tank) is provided with a carrier on which anaerobic microorganisms attach and grow, and the aerobic area (22) (or aerobic tank) is provided with aerobic microorganisms. Hereinafter, the anaerobic area or anaerobic tank will be referred to as the anaerobic area, and the aerobic area or aerobic tank will be referred to as the aerobic area.

[0047] Under this configuration, livestock wastewater that has passed through the livestock wastewater pretreatment tank (10) flows into the anaerobic zone (21) of the biological water treatment device, and bacteria, heavy metals, and antibiotics contained in the livestock wastewater are removed by anaerobic microorganisms within the anaerobic zone (21). The livestock wastewater in the anaerobic zone (21) is transferred to the aerobic zone (22), where organic matter is decomposed. In addition, denitrification and nitrification reactions proceed in the anaerobic zone (21) and the aerobic zone (22) along with the reactions described above.

[0048] Specifically, in the aerobic zone (22), a nitrification process is carried out in which ammonia nitrogen (NH4-N) contained in livestock wastewater is converted into nitrate nitrogen (NO3-N) by a nitrification reaction, and in the anaerobic zone (21), a denitrification process is carried out in which nitrate nitrogen (NO3-N) is converted into nitrogen (N2), thereby primarily removing ammonia nitrogen contained in livestock wastewater.

[0049] In order to remove ammoniacal nitrogen contained in the livestock wastewater through a biological water treatment device (20), a portion of the livestock wastewater in the aerobic zone (22) is returned to the anaerobic zone (21) or the livestock wastewater pretreatment tank (10). Finally, the livestock wastewater that has passed through the aerobic zone (22) is transferred to the pretreatment device (30).

[0050] The pretreatment device (30) is a pretreatment means for the reverse osmosis membrane module (40) and produces pretreated water by removing impurities contained in livestock wastewater, such as organic matter, bacteria, and heavy metals, and the pretreated water is supplied as water to be treated by the reverse osmosis membrane module (40). Impurities in the livestock wastewater are removed by a pretreatment separation membrane module constituting the pretreatment device (30), and the detailed configuration of the pretreatment device (30) will be described later.

[0051] The reverse osmosis membrane module (40) serves to separate pre-treated water into treated water and concentrated water by the action of high pressure under a reverse osmosis membrane. A high-pressure pump (not shown) is provided at the front of the reverse osmosis membrane module (40) to apply high pressure to the pre-treated water. Additionally, a safety filter may be provided at the front of the high-pressure pump to further remove foreign substances contained in the pre-treated water. The treated water produced by the reverse osmosis membrane module (40) can be used as reusable water such as agricultural water, and the concentrated water of the reverse osmosis membrane module (40) is transferred to an electrochemical separation membrane device (50).

[0052] The electrochemical separation membrane device (50) removes residual ammoniacal nitrogen contained in the concentrated water, using the concentrated water discharged from the reverse osmosis membrane module (40) as the water to be treated. As described above, in the present invention, ammoniacal nitrogen contained in livestock wastewater is primarily removed by the biological water treatment device (20), and residual ammoniacal nitrogen not removed by the biological water treatment device (20) is removed by the electrochemical separation membrane device (50). The biological water treatment device (20) removes ammoniacal nitrogen by reducing it to nitrogen through nitrification and denitrification reactions, and the electrochemical separation membrane device (50) removes ammonium ions (NH4) in the water + ) is removed by converting it into ammonia gas (NH3) and recovering it. The detailed configuration of the electrochemical separation membrane device (50) is described as follows.

[0053] Referring to FIG. 2, the electrochemical membrane device (50) comprises an ammonia recovery reaction tank (110), an ammonia recovery membrane module (120), an ammonia recovery chamber (130), and a cathode (140).

[0054] The ammonia recovery reaction tank is provided with a space for storing concentrated water discharged from the reverse osmosis membrane module (40), and the ammonia recovery separation membrane module (120) and the cathode (140) are provided in a form that is immersed in the concentrated water of the ammonia recovery reaction tank (110). Although not shown in the drawing, a power supply device is provided on one side of the ammonia recovery reaction tank (110) to supply power to the ammonia recovery separation membrane module (120) and the cathode (140).

[0055] The ammonia recovery membrane module (120) removes ammonium ions (NH4) in water when power is applied. +It serves to convert the ammonia gas (NH3) into ammonia gas (NH3) and recover the converted ammonia gas (NH3). As shown in FIG. 3, this ammonia recovery membrane module has a structure in which a membrane heating layer (122), an ammonia separation layer (123), and an ammonia conversion induction layer (124) are sequentially stacked on an ammonia recovery layer (121).

[0056] The ammonia conversion induction layer (124) and the membrane heating layer (122) are made of a conductive material and are physically in contact with each other and electrically connected. In one embodiment, an ammonia separation layer (123) is interposed between the ammonia conversion induction layer (124) and the membrane heating layer (122). By making the area of ​​the ammonia separation layer (123) relatively small, physical contact and electrical connection between the ammonia conversion induction layer (124) and the membrane heating layer (122) can be induced.

[0057] The ammonia conversion inducing layer (124) and the separator heating layer (122), which are made of a conductive material and are electrically connected to each other, serve as the anode in the electrochemical separator device (50) of the present invention. That is, power from the power supply device is applied to the cathode (140) and the ammonia conversion inducing layer (124) and the separator heating layer (122).

[0058] When power is applied to the ammonia conversion inducing layer (124) and the membrane heating layer (122), hydroxide ions (OH) on the surface of the ammonia conversion inducing layer (124) are produced by a hydrogen generation reaction. - ) is generated. Hydroxide ions (OH) - Due to the generation of ), the pH is locally raised near the surface of the ammonia conversion-inducing layer (124). For example, the pH of the concentrated water near the surface of the ammonia conversion-inducing layer (124) rises to 11 or higher. As is known, ammonium ions (NH4) in water + Since ) has the characteristic of being converted into ammonia gas (NH3) at a pH of 11 or higher, hydroxide ions (OH) on the surface of the ammonia conversion inducing layer (124) -As the pH rises above 11 due to the generation of ), ammonium ions (NH4) in the water + ) is converted into ammonia gas (NH3). For reference, the concentrated water of the reverse osmosis membrane module (40) typically has a pH of 6 to 8.

[0059] At this time, hydroxide ions (OH) - ) is generated on the surface of the ammonia conversion-inducing layer (124), and the pH increase occurs locally near the surface of the ammonia conversion-inducing layer (124), along with ammonium ions (NH4 + The conversion of ) into ammonia gas (NH3) also occurs near the surface of the ammonia conversion inducing layer (124), so the generated ammonia gas (NH3) is easily recovered by the ammonia recovery membrane module (120).

[0060] The ammonia conversion inducing layer (124), which acts as an anode together with the separator heating layer (122), may be made of a conductive polymer in one embodiment. Any one of polyaniline (PANI), polypyrrole (PPy), polythiophene (PT), or PEDOT:PSS (poly(3,4-ethylenedioxythiophene) polystyrene sulfonate) may be used as the conductive polymer. This conductive polymer is coated in a form applied to the entire surface of the ammonia recovery layer (121), including the ammonia separation layer (123), to form a porous structure.

[0061] The ammonia separation layer (123), which is provided in a form interposed between the ammonia conversion inducing layer (124) and the separation membrane heating layer (122), is a thin film with pores formed to enable the movement of ammonia gas (NH3), and the ammonia gas (NH3) generated near the surface of the ammonia conversion inducing layer (124) moves toward the ammonia recovery layer (121) through the pores of the ammonia separation layer (123).

[0062] In one embodiment, the ammonia separation layer (123) may be a porous polymer separation membrane or a porous ceramic separation membrane, and in the case of a porous polymer separation membrane, any one of polydimethylsiloxane, polyethylene, polypropylene, polycarbonate, or polyamide may be used.

[0063] As described above, the separator heating layer (122) is electrically connected to the ammonia conversion induction layer (124) to perform the role of an anode, and also induces joule heating when power is applied to promote the movement of ammonia gas (NH3). The separator heating layer (122) is composed of a material with excellent electrical and thermal conductivity, and in one embodiment, it may be composed of carbon fiber. When using carbon fiber, the separator heating layer (122) may be formed by coating the ammonia recovery layer (121) with a solution in which carbon fiber is dispersed, or by electrospinning carbon fiber onto the ammonia recovery layer (121). In this case, the carbon fiber is provided in a network form, so even if the carbon fiber is stacked, the surface of the ammonia recovery layer (121) is partially exposed.

[0064] With an ammonia separation layer (123) provided on one side of the membrane heating layer (122) and an ammonia recovery layer (121) provided on the other side, when power is applied to the membrane heating layer (122), the temperature of the membrane heating layer (122) is raised by Joule heating, and the heat of the membrane heating layer (122) is transferred to the ammonia separation layer (123) and the ammonia recovery layer (121). As a result, the temperature of the ammonia gas (NH3) moving through the pores of the ammonia separation layer (123) and the ammonia recovery layer (121) is raised, and since the rise in the temperature of the ammonia gas (NH3) means an increase in the movement speed of the ammonia gas (NH3), the recovery efficiency of the ammonia gas is increased by the Joule heating effect of the membrane heating layer (122). FIG. 9 shows the temperature change of the ammonia recovery membrane module according to the power application, and FIG. 10 shows the experimental results of the amount of raw water evaporated according to the temperature of the ammonia recovery membrane module. Through the results of FIG. 9 and FIG. 10, it can be confirmed that the temperature rise is caused by the membrane heating layer (122), and thus the ammonia gas recovery efficiency can be improved.

[0065] In addition to the role of an anode and a role of inducing Joule heating as described above, the separator heating layer (122) additionally serves as a medium to spatially connect the pores of the ammonia separation layer (123) and the pores of the ammonia recovery layer (121). The ammonia separation layer (123) and the ammonia recovery layer (121), described later, perform the function of a gas separation membrane to induce the movement of ammonia gas (NH3). If the separator heating layer (122) is not present, the ammonia separation layer (123) is stacked on the ammonia recovery layer (121), and in this case, the ammonia recovery layer (121) and the ammonia separation layer (123) can block each other's pores.

[0066] On the other hand, as a separation membrane heating layer (122) is provided between the ammonia recovery layer (121) and the ammonia separation layer (123) with a certain thickness and in a form that partially exposes the surface of the ammonia recovery layer (121), the pores of the ammonia recovery layer (121) and the pores of the ammonia separation layer (123) are spatially connected to each other through the separation membrane heating layer (122).

[0067] The ammonia recovery layer (121) is formed on the surface of the ammonia conversion induction layer (124) and serves to finally recover the ammonia gas (NH3) that has passed through the ammonia separation layer (123) and the separation membrane heating layer (122) in sequence, and performs the function of a gas separation membrane together with the ammonia separation layer (123). As an example, a porous polymer separation membrane or a porous ceramic separation membrane may be applied as the ammonia recovery layer (121), and in the case of the porous polymer separation membrane, it may be made of any one of polypropylene, polyethylene, polydimethylsiloxane, polycarbonate, or polyamide.

[0068] The ammonia recovery chamber (130) has a three-dimensional structure with one side open and a space for collecting ammonia gas (NH3), and the open portion is in close contact with one side of the ammonia recovery layer (121). In addition, to facilitate the recovery of ammonia gas (NH3) passing through the ammonia recovery layer (121) into the ammonia recovery chamber (130), it is preferable that the pressure inside the ammonia recovery chamber (130) be set lower than the pressure acting on the ammonia recovery membrane module (120). That is, it is preferable to maintain the pressure inside the ammonia recovery chamber (130) in a negative pressure state, and in one embodiment, the inside of the ammonia recovery chamber (130) can be set to a vacuum state. A pressure pump may be provided on one side of the ammonia recovery chamber (130) to set the negative pressure of the ammonia recovery chamber (130).

[0069] Meanwhile, the ammonia gas (NH3) recovered through the ammonia recovery layer (121) may be recovered in the form of salt. In this case, an acidic solution tank is provided on one side of the ammonia recovery reaction tank (110) to replace the ammonia recovery chamber (130), and the ammonia gas (NH3) that has passed through the ammonia recovery layer (121) is supplied to the acidic solution of the acidic solution tank. The acidic solution of the acidic solution tank is one of nitric acid solution, sulfuric acid solution, or phosphoric acid solution, and when ammonia gas (NH3) is supplied to the acidic solution, the ammonia gas (NH3) reacts with one of nitric acid, sulfuric acid, or phosphoric acid to produce one of ammonium nitrate, ammonium sulfate, or ammonium phosphate within the acidic solution, forming a dissolved state. Ammonium nitrate, ammonium sulfate, ammonium phosphate, etc. in an acidic solution can be utilized as fertilizer, etc. Fig. 8 shows an electrochemical membrane device manufactured according to one embodiment of the present invention.

[0070] The detailed configuration of the electrochemical separation device (50) has been described above. As described above, the electrochemical separation device (50) is an ammonium ion (NH4 + Ammoniacal nitrogen remaining in the concentrated water of the reverse osmosis membrane module (40) is removed by converting the ammoniacal nitrogen into ammonia gas (NH3) through an electrochemical reaction and recovering the converted ammonia gas. To summarize again, ammoniacal nitrogen in livestock wastewater is primarily removed by the biological water treatment device (20), and the remaining ammoniacal nitrogen is removed by the electrochemical separation membrane device (50).

[0071] Meanwhile, it has been described that livestock wastewater that has passed through an aerobic tank is supplied to a pretreatment device (30), and the pretreatment device (30) produces pretreated water using the livestock wastewater as the water to be treated, and the pretreated water is supplied to the reverse osmosis membrane module (40) as the water to be treated. The detailed configuration of the pretreatment device (30) is described as follows.

[0072] Referring to FIGS. 4 to 6, the pretreatment device (30) comprises a raw water supply pipe (220), a plurality of pretreatment separation membrane modules (230), a pretreatment water pipe (240), a pretreatment water collection pipe (250), a backwash water discharge pipe (260), and a backwash water collection pipe (270).

[0073] The raw water supply pipe (220) is formed in a branched form from the raw water pipe (210), and a plurality of raw water supply pipes (220) are connected to the raw water pipe (210). The other end of each raw water supply pipe (220) is connected to a pretreatment membrane module (230). Accordingly, livestock wastewater, i.e., raw water, that has passed through the aerobic tank is supplied to the raw water pipe (210), and the raw water from the raw water pipe (210) is supplied to each pretreatment membrane module (230) through the raw water supply pipe (220). Here, a raw water tank (not shown) may be further provided, and the raw water tank may store livestock wastewater that has passed through the aerobic tank.

[0074] Meanwhile, the raw water supply pipe (220) performs the role of supplying raw water to the pretreatment membrane module (230), in addition to the role of supplying raw water to the pretreatment membrane module (230), and also performs the role of transporting backwash water used for backwashing of the pretreatment membrane module (230) in the opposite direction of the raw water supply direction, which will be described later.

[0075] The pretreatment membrane module (230) performs a filtration process on raw water supplied through the raw water supply pipe (220) to remove impurities contained in the raw water, thereby producing pretreated water. Each pretreatment membrane module (230) can be arranged side by side adjacent to each other, and each pretreatment membrane module (230) has a structure that allows for independent attachment and detachment.

[0076] A pre-treated water pipe (240) is connected to one end of the pre-treatment separation membrane module (230), and the pre-treated water produced by the pre-treatment separation membrane module (230) is discharged through the pre-treated water pipe (240). Additionally, each pre-treated water pipe (240) provided in the pre-treatment separation membrane module (230) is connected to a pre-treated water collection pipe (250), so that the pre-treated water produced by the plurality of pre-treatment separation membrane modules (230) is collected in the pre-treated water collection pipe (250), and the pre-treated water collected in the pre-treated water collection pipe (250) is finally supplied to the reverse osmosis membrane module (40).

[0077] Meanwhile, the backwash water discharge pipe (260) is provided in a form connected to the three-way valve (280), and the three-way valve (280) is connected not only to the backwash water discharge pipe (260) but also to the raw water supply pipe (220) and the raw water pipe (210). That is, the three-way valve (280) is provided with three pipe connectors, and the raw water pipe (210), the raw water supply pipe (220), and the backwash water discharge pipe (260) are connected to each pipe connector. Accordingly, the raw water of the raw water pipe (210) is supplied to the raw water supply pipe (220) through the three-way valve (280).

[0078] Previously, it was described that a plurality of raw water supply pipes (220) are provided, and each raw water supply pipe (220) is connected to a pretreatment membrane module (230). A backwash water discharge pipe (260) is also provided to correspond to the raw water supply pipes (220). That is, a plurality of backwash water discharge pipes (260) are provided to correspond to each raw water supply pipe (220), and a three-way valve (280) mediates between the raw water supply pipe (220) and the backwash water discharge pipe (260).

[0079] The backwash water discharge pipe (260) serves to discharge backwash water used for backwashing the pretreatment membrane module (230). Specifically, the backwash water used for backwashing the pretreatment membrane module (230) is discharged through the raw water supply pipe (220) and the three-way valve (280) to the backwash water discharge pipe (260), and the backwash water discharged from the multiple backwash water discharge pipes (260) is collected in the backwash water collection pipe (270) and discharged to the outside. As described above, in addition to the role of supplying raw water to the pretreatment membrane module (230), the raw water supply pipe (220) also performs the role of transporting the backwash water discharged from the pretreatment membrane module (230) in the opposite direction of the raw water supply direction.

[0080] Meanwhile, in order for the backwash water of the pretreatment membrane module (230) to be discharged to the backwash water discharge pipe (260) through the raw water supply pipe (220) and the three-way valve (280), the operation of the three-way valve (280) is required. Specifically, when the pipe connection port on the raw water pipe (210) side of the three-way valve (280) is blocked and the pipe connection port on the backwash water discharge pipe (260) side of the three-way valve (280) is open, it becomes possible for the backwash water of the pretreatment membrane module (230) to be discharged to the backwash water discharge pipe (260) through the raw water supply pipe (220) and the three-way valve (280). At this time, when raw water is supplied to the pretreatment membrane module (230), the pipe connection port on the raw water pipe (210) side of the three-way valve (280) is opened, and the pipe connection port on the backwash water discharge pipe (260) side of the three-way valve (280) is closed, so that the raw water from the raw water pipe (210) can be supplied to the pretreatment membrane module (230) through the raw water supply pipe (220). That is, depending on the selective opening and closing operation of the three-way valve (280), the supply of raw water or the discharge of backwash water becomes possible.

[0081] Under the structure described above, a filtration process for raw water can be performed using a plurality of pretreatment membrane modules (230), and if a backwashing process is required, the filtration process and the backwashing process can be performed simultaneously.

[0082] When only the filtration process is performed (see FIG. 7a), the raw water in the raw water pipe (210) is supplied to all raw water supply pipes (220) connected to the raw water pipe (210) through the three-way valve (280). At this time, the three-way valve (280) opens the pipe connection on the raw water pipe (210) side and blocks the pipe connection on the backwash water discharge pipe (260) side. The raw water is supplied to each pretreatment membrane module (230) through the raw water supply pipe (220), and the pretreatment membrane module (230) performs a filtration process on the raw water to produce pretreated water, and the produced pretreated water is discharged through the pretreated water pipe (240) and collected in the pretreated water collection pipe (250). The pretreated water collected in the pretreated water collection pipe (250) is transferred to the high-pressure pump (40) upstream of the reverse osmosis membrane module (40).

[0083] Meanwhile, when the filtration process and the backwashing process are performed simultaneously (see FIG. 7b), one of the multiple pretreatment membrane modules (230) performs the backwashing process, and the remaining pretreatment membrane modules (230) perform the filtration process. More precisely, the backwashing process is performed sequentially for each pretreatment membrane module (230), and the remaining pretreatment membrane modules (230), excluding the pretreatment membrane module (230) for which the backwashing process is performed, perform the filtration process.

[0084] The simultaneous execution of these filtration and backwashing processes is made possible by the operation of the three-way valve (280) and the pressure of the pre-treated water collected in the pre-treated water collection pipe (250). This is explained in detail as follows.

[0085] First, regarding the three-way valve (280) corresponding to the pretreatment membrane module (230) to be subjected to a backwashing process, the opening and closing of the three-way valve (280) is controlled so that the pipe connection on the raw water pipe (210) side of the three-way valve (280) is blocked, and the pipe connection on the backwash water discharge pipe (260) side of the three-way valve (280) is opened. Additionally, regarding the three-way valve (280) corresponding to each of the remaining pretreatment membrane modules (230) to be subjected to a filtration process, the opening and closing of the three-way valve (280) is controlled so that the pipe connection on the raw water pipe (210) side of the three-way valve (280) is opened, and the pipe connection on the backwash water discharge pipe (260) side of the three-way valve (280) is blocked.

[0086] In this state, when raw water is supplied to the raw water pipe (210), pre-treated water is produced in each of the remaining pre-treated membrane modules (230), excluding the pre-treated membrane module (230) that performs the backwashing process, and the produced pre-treated water passes through the pre-treated water pipe (240) and is collected in the pre-treated water collection pipe (250).

[0087] In the case where raw water is supplied and pretreated water is produced by the pretreatment membrane module (230), the raw water is supplied at a constant pressure, for example, 2 to 5 kgf / cm² 2 The pretreated water that is supplied and produced and collected in the pretreated water collection pipe (250) is also at a constant pressure, for example, 1 to 2 kgf / cm² 2 It has pressure.

[0088] In this manner, when pre-treated water with a constant pressure is produced and collected in the pre-treated water collection pipe (250), raw water is not supplied to the pre-treated membrane module (230) where the backwashing process is to be performed and to the raw water supply pipe (220) connected thereto. Consequently, the pre-treated water with a constant pressure in the pre-treated water collection pipe (250) is supplied to the pre-treated membrane module (230) where the backwashing process is to be performed. That is, due to the pressure difference between the pre-treated water collection pipe (250) and the pre-treated membrane module (230) where the backwashing process is to be performed, the pre-treated water with a constant pressure in the pre-treated water collection pipe (250) is supplied to the pre-treated membrane module (230) where the backwashing process is to be performed through the pre-treated water pipe (240). Accordingly, a backwashing process using pre-treated water is carried out in the pre-treatment membrane module (230), and the pre-treated water used in the backwashing process, i.e., the backwash water, is discharged through the raw water supply pipe (220) and the three-way valve (280) to the backwash water discharge pipe (260).

[0089] When the backwashing process for the first pretreatment membrane module (230) is completed, the backwashing process for the second pretreatment membrane module (230) is carried out. To this end, the three-way valve (280) corresponding to the second pretreatment membrane module (230) where the backwashing process is to be carried out and the three-way valve (280) corresponding to the remaining pretreatment membrane module (230) where the filtration process is to be carried out are controlled to open and close as described above. That is, in the case of the three-way valve (280) corresponding to the second pretreatment membrane module (230) where the backwashing process is to be performed, the pipe connection port on the raw water pipe (210) side of the three-way valve (280) is controlled to be blocked, and the pipe connection port on the backwash water discharge pipe (260) side of the three-way valve (280) is controlled to be open, and in the case of the three-way valve (280) corresponding to the remaining pretreatment membrane module (230) where the filtration process is to be performed, the pipe connection port on the raw water pipe (210) side of the three-way valve (280) is controlled to be open, and the pipe connection port on the backwash water discharge pipe (260) side of the three-way valve (280) is controlled to be blocked.

[0090] In this state, the backwashing process for the second pretreatment membrane module (230) is carried out, and the filtration process by the remaining pretreatment membrane module (230) is carried out simultaneously. The principle by which the backwashing process for the second pretreatment membrane module (230) is carried out, and the filtration process by the remaining pretreatment membrane module (230) is carried out simultaneously, is the same as the backwashing of the first pretreatment membrane module (230) and the filtration method of the remaining pretreatment membrane module (230). That is, the filtration process is carried out in the remaining pretreatment membrane modules (230) excluding the second pretreatment membrane module (230), and accordingly, due to the pressure difference between the pretreatment water collection pipe (250) and the pretreatment membrane module (230) where the backwashing process is to be carried out, the pretreatment water having a certain pressure in the pretreatment water collection pipe (250) is supplied to the pretreatment membrane module (230) where the backwashing process is to be carried out through the pretreatment water pipe (240) so that backwashing is carried out, and the backwash water of the pretreatment membrane module (230) is discharged to the backwash water discharge pipe (260) through the raw water supply pipe (220) and the three-way valve (280).

[0091] In the manner described above, a backwashing process can be sequentially performed on a plurality of pretreatment membrane modules (230), and a filtration process is simultaneously performed on the remaining membrane modules (230), excluding the pretreatment membrane module (230) where the backwashing process is performed. The simultaneous performance of the filtration process and the backwashing process has been explained above.

[0092] The pretreatment device (30) according to the present invention repeatedly performs a filtration process and simultaneously performs a filtration process and a backwashing process. That is, a filtration process is performed for a certain period of time, and if backwashing of the pretreatment membrane module (230) is required after a certain period of time, a filtration process and a backwashing process are performed simultaneously. In this way, the filtration process and the filtration process and the backwashing process can be repeated at regular time intervals, and if the pressure of the pretreatment water supplied to the high-pressure pump (40) provided at the front of the reverse osmosis membrane module (40) is lower than a reference value, the filtration process and the backwashing process can be performed simultaneously even if the backwashing cycle has not been reached.

[0093] Meanwhile, the pretreatment device (30) according to the present invention may further be provided with a control unit to control the execution of a filtration process and the simultaneous execution of a filtration process and a backwashing process.

[0094] The control unit controls the opening and closing operation of the three-way valve (280) based on the backwash cycle or the pressure of the pre-treated water, so that the pre-treatment device (30) performs the operation of carrying out the filtration process or the simultaneous operation of the filtration process and the backwash process. Specifically, the control unit controls the opening and closing operation of the three-way valve (280) so that the filtration process or the simultaneous operation of the filtration process and the backwash process proceeds when a certain amount of time has elapsed according to the pre-entered backwash cycle, and also controls the opening and closing operation of the three-way valve (280) so that the filtration process and the backwash process proceed when the difference between the pressure of the raw water and the pressure of the pre-treated water is greater than a preset reference value even when the pre-entered backwash cycle has not arrived. Here, the opening and closing operation of the three-way valve (280) corresponding to the carrying out of the filtration process and the opening and closing operation of the three-way valve (280) corresponding to the simultaneous operation of the filtration process and the backwash process are as described above. That is, the opening and closing operation of the three-way valve (280) corresponding to the execution of the filtration process is to control the opening and closing of the three-way valve (280) so that the pipe connection port on the raw water pipe (210) side of the three-way valve (280) is opened, and the pipe connection port on the backwash water discharge pipe (260) side of the three-way valve (280) is blocked. The opening and closing operation of the three-way valve (280) corresponding to the simultaneous execution of the filtration process and the backwash process is to control the opening and closing of the three-way valve (280) so that the pipe connection port on the raw water pipe (210) side of the three-way valve (280) is blocked, and the pipe connection port on the backwash water discharge pipe (260) side of the three-way valve (280) is opened.

[0095] Additionally, the control unit can control the timing and operation of chemical cleaning for the pretreatment membrane module (230). As previously described, the simultaneous execution of the filtration process and the backwash process is carried out based on the backwash cycle or the pressure of the pretreatment water. The control unit performs chemical cleaning when the number of times the simultaneous execution of the filtration process and the backwash process is carried out within a certain period exceeds a preset number. In this case, the control unit can induce the pretreatment membrane module (230) to be chemically cleaned by the chemical contained in the raw water by introducing a chemical into the raw water from a chemical supply tank (60) provided on one side of the raw water tank (20). At this time, the chemical may be a non-oxidizing disinfectant, for example, a bromine-based disinfectant. Conventionally, sodium hypochlorite is applied as a chemical for chemical cleaning. When using sodium hypochlorite, a reducing agent such as SBS (Sodium Bisulfite) must be used to prevent damage to the reverse osmosis membrane, and a separate disinfectant (e.g., Biocide) must be added to the raw water supplied to the reverse osmosis membrane. However, if a non-oxidizing bromine-based disinfectant is applied, SBS (Sodium Bisulfite) and a separate disinfectant are not required. Explanation of the symbols

[0096] 10: Livestock wastewater pretreatment tank 20: Biological water treatment device 21: Anaerobic zone 22: Aerobic zone 30 : Pretreatment device 40 : Reverse osmosis membrane module 50: Electrochemical membrane device 60: Microbubble supply device 110: Ammonia recovery reactor 120: Ammonia recovery membrane module 121: Ammonia recovery layer 122: Membrane heating layer 123: Ammonia separation layer 124: Ammonia conversion induction layer 130: Ammonia recovery chamber 140: Cathode 210 : Raw water pipe 220 : Raw water supply pipe 230: Membrane Module 240: Pre-treated Water Piping 250: Pre-treated water collection pipe 260: Backwash water discharge pipe 270 : Backwash collection pipe 280 : 3-way valve

Claims

Claim 1 A livestock wastewater pretreatment tank for digesting livestock wastewater; a biological water treatment device that uses livestock wastewater that has passed through the livestock wastewater pretreatment tank as the target water for treatment, removes ammoniacal nitrogen contained in the livestock wastewater through nitrification and denitrification reactions, and simultaneously removes impurities contained in the livestock wastewater; a pretreatment device that uses livestock wastewater that has passed through the biological water treatment device as the target water for treatment, removes impurities contained in the livestock wastewater to produce pretreated water; a reverse osmosis membrane module that separates the pretreated water into treated water and concentrated water through a reverse osmosis membrane process; and using the concentrated water from the reverse osmosis membrane module as the target water for treatment, the ammonium ions (NH4) contained in the concentrated water + It comprises an electrochemical membrane device that converts ) into ammonia gas (NH3) and recovers it through an electrochemical reaction; and the electrochemical membrane device comprises ammonium ions (NH4 + An ammonia recovery reaction tank filled with raw water containing ), and power is applied, and when power is applied, ammonium ions (NH4) in the water + A livestock wastewater treatment system using a biological process and an electrochemical membrane device, comprising: an ammonia recovery membrane module that converts ) into ammonia gas (NH3) and recovers the converted ammonia gas (NH3); an ammonia recovery chamber that is closely attached to one side of the ammonia recovery membrane module and finally recovers the ammonia gas (NH3) that has passed through the ammonia recovery membrane module; and a cathode to which power is applied; wherein the ammonia recovery membrane module has a structure in which a membrane heating layer, an ammonia separation layer, and an ammonia conversion induction layer are sequentially stacked on an ammonia recovery layer, and the membrane heating layer and the ammonia conversion induction layer are electrically connected to perform the role of an anode and form a porous structure, and the ammonia separation layer and the ammonia recovery layer perform the function of a gas separation membrane capable of moving ammonia gas. Claim 2 delete Claim 3 delete Claim 4 In claim 1, when power is applied to the separator heating layer, the ammonia conversion inducing layer, and the cathode, hydroxide ions (OH) on the surface of the ammonia conversion inducing layer - ) is generated, and hydroxide ions (OH) - Ammonium ions (NH4) near the surface of the ammonia conversion-inducing layer due to ) generation + A livestock wastewater treatment system using a biological process and an electrochemical membrane device, characterized in that ) is converted into ammonia gas (NH3), and the converted ammonia gas (NH3) sequentially passes through the pores of a porous structured ammonia conversion inducing layer, an ammonia separation layer, a porous structured membrane heating layer, and an ammonia recovery layer. Claim 5 A livestock wastewater treatment system using a biological process and an electrochemical membrane device according to claim 4, characterized in that when power is applied, the temperature of the membrane heating layer is raised by Joule heating, the heat from the membrane heating layer is transferred to the ammonia separation layer and ammonia recovery layer adjacent to the membrane heating layer, thereby raising the temperature of the ammonia separation layer and ammonia recovery layer, and the velocity of ammonia gas passing through the ammonia separation layer and ammonia recovery layer is increased due to the rise in temperature of the ammonia separation layer and ammonia recovery layer. Claim 6 A livestock wastewater treatment system using a biological process and an electrochemical membrane separation device, characterized in that, in claim 1, an ammonia separation layer is interposed between the ammonia conversion induction layer and the membrane heating layer, and the area of ​​the ammonia separation layer is relatively small so that physical contact and electrical connection between the ammonia conversion induction layer and the membrane heating layer are possible. Claim 7 A livestock wastewater treatment system using a biological process and an electrochemical membrane device according to claim 1, wherein the ammonia recovery chamber has a three-dimensional structure with one side open and a space for collecting ammonia gas (NH3), the open portion is provided in close contact with one side of the ammonia recovery layer, the ammonia gas (NH3) generated on the surface of the ammonia conversion induction layer and passing through the ammonia separation layer, the membrane heating layer, and the ammonia recovery layer in sequence is finally recovered in the ammonia recovery chamber, and the pressure inside the ammonia recovery chamber is set to be lower than the pressure acting on the ammonia recovery membrane module. Claim 8 In claim 1, the electrochemical membrane device comprises ammonium ions (NH4 + An ammonia recovery reaction tank filled with raw water containing ), and power is applied, and when power is applied, ammonium ions (NH4) in the water + The apparatus comprises an ammonia recovery membrane module that converts ) into ammonia gas (NH3) and recovers the converted ammonia gas (NH3), an acidic solution tank provided on one side of the ammonia recovery reaction tank for recovering ammonia gas (NH3) that has passed through the ammonia recovery layer in the form of salt, and a cathode to which power is applied; wherein the acidic solution of the acidic solution tank is any one of a nitric acid solution, a sulfuric acid solution, or a phosphoric acid solution, and when ammonia gas (NH3) is supplied to the acidic solution of the acidic solution tank, the ammonia gas (NH3) reacts with any one of nitric acid, sulfuric acid, or phosphoric acid to form any one of ammonium nitrate, ammonium sulfate, or ammonium phosphate within the acidic solution, forming a dissolved state, and any one of ammonium nitrate, ammonium sulfate, or ammonium phosphate within the acidic solution can be utilized as fertilizer. Livestock wastewater treatment system using biological processes and electrochemical membrane separation devices. Claim 9 In claim 1, the pretreatment device comprises: a raw water tank for storing livestock wastewater that has passed through an aerobic tank as raw water; a raw water pipe for supplying raw water from the raw water tank to a raw water supply pipe; a plurality of raw water supply pipes branched from the raw water pipe and supplying raw water supplied from the raw water pipe to a membrane module; a plurality of pretreatment membrane modules connected to each raw water supply pipe and filtering the raw water supplied from the raw water supply pipe to produce pretreated water; a plurality of pretreated water pipes provided on one side of the pretreatment membrane module for discharging pretreated water produced by the pretreatment membrane module; a pretreated water collection pipe connected to each pretreated water pipe for collecting pretreated water produced by the plurality of pretreatment membrane modules; a backwash water discharge pipe provided corresponding to each raw water supply pipe for discharging backwash water discharged from the pretreatment membrane module; and a pipe connector on the raw water pipe side, a pipe connector on the raw water supply pipe side, and a pipe connector on the backwash water discharge pipe side. A livestock wastewater treatment system using a biological process and an electrochemical membrane separation device, characterized by comprising: a control unit that controls the opening and closing operation of each pipe connection port of the three-way valve and mediates the connection of a raw water pipe, a raw water supply pipe, and a backwash water discharge pipe, thereby enabling the <implementation of a filtration process> or <simultaneous implementation of a filtration process and a backwash process>. Claim 10 A livestock wastewater treatment system using a biological process and an electrochemical membrane separation device, characterized in that, in claim 9, the <implementation of a filtration process> and the <simultaneous implementation of a filtration process and a backwashing process> are repeated, and the control unit causes the <simultaneous implementation of a filtration process and a backwashing process> to proceed when a backwashing cycle arrives or when the difference between the pressure of the raw water and the pressure of the pre-treated water exceeds a preset reference value. Claim 11 In claim 10, the <implementation of the filtration process> is characterized by the process in which, while the pipe connection port on the raw water pipe side of the three-way valve is open and the pipe connection port on the backwash water discharge pipe side is closed, raw water from the raw water pipe is supplied to each pretreatment membrane module through the raw water supply pipe, the pretreatment membrane module performs a filtration process on the raw water to produce pretreated water, the produced pretreated water is discharged through the pretreated water pipe and collected in the pretreated water collection pipe, and the pretreated water collected in the pretreated water collection pipe is supplied to the reverse osmosis membrane module side. Claim 12 A livestock wastewater treatment system using a biological process and an electrochemical membrane device, wherein <simultaneous execution of filtration and backwashing processes> is characterized in that the backwashing process is performed sequentially for each pretreatment membrane module, and the remaining pretreatment membrane modules, excluding the pretreatment membrane module on which the backwashing process is performed, are subjected to a filtration process. Claim 13 In Clause 12, the three-way valve corresponding to the membrane module where the backwashing process is performed has the pipe connection on the raw water pipe side closed while the pipe connection on the backwash water discharge pipe side is open, and the three-way valve corresponding to each of the remaining membrane modules where the filtration process is performed has the pipe connection on the raw water pipe side open while the pipe connection on the backwash water discharge pipe side is closed; when raw water is supplied to the raw water pipe, pretreated water is produced in each of the remaining pretreatment membrane modules excluding the pretreatment membrane module where the backwashing process is performed, and the produced pretreated water passes through the pretreated water pipe and is collected in the pretreated water collection pipe, and the pretreated water collected in the pretreated water collection pipe has a certain pressure, and due to the pressure difference between the pretreated water collected in the pretreated water collection pipe and the pretreatment membrane module where the backwashing process is performed, the pretreated water collected in the pretreated water collection pipe passes through the pretreated water pipe to the pretreatment where the backwashing process is performed A livestock wastewater treatment system using a biological process and an electrochemical membrane device, characterized by the process in which water is supplied to a membrane module, the backwashing process of the pretreatment membrane module is carried out by the supplied pretreatment water, and the backwash water, which is the pretreatment water used in the backwashing process, is discharged through a raw water supply pipe and a three-way valve to a backwash water discharge pipe. Claim 14 A livestock wastewater treatment system using a biological process and an electrochemical membrane separation device according to claim 1, wherein the biological water treatment device comprises a reaction tank, the lower part of the reaction tank is divided into an anaerobic zone and the upper part of the reaction tank is divided into an aerobic zone, a portion of the livestock wastewater in the aerobic zone is returned to the anaerobic zone or a livestock wastewater pretreatment tank, a nitrification process in which ammoniacal nitrogen is converted into nitrate nitrogen proceeds in the aerobic zone, and a denitrification process in which nitrate nitrogen is converted into nitrogen proceeds in the anaerobic zone. Claim 15 A livestock wastewater treatment system using a biological process and an electrochemical membrane separation device according to claim 14, characterized in that a carrier on which anaerobic microorganisms are attached and grown is provided in an anaerobic zone, aerobic microorganisms are provided in an aerobic zone, at least one of bacteria, heavy metals, and antibiotics contained in the livestock wastewater is removed by the anaerobic microorganisms in the anaerobic zone, and organic matter contained in the livestock wastewater is decomposed in the aerobic zone. Claim 16 A livestock wastewater treatment system using a biological process and an electrochemical membrane separation device, characterized in that, in claim 1, a microbubble supply device for supplying microbubbles to a livestock wastewater treatment tank is further provided on one side of the livestock wastewater pretreatment tank, and the oxygen transfer rate is increased by the supply of microbubbles, thereby promoting the oxidation and decomposition of organic matter contained in the livestock wastewater.

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