Wastewater treatment system and method for secondary battery separator manufacturing process

Abstract

The present invention comprises: a water collection tank for collecting and storing wastewater generated in a separator manufacturing process; a first pre-treatment unit for primary pre-treatment of the wastewater stored in the water collection tank; a second pre-treatment unit for secondary pre-treatment of the wastewater that has undergone primary pre-treatment using a treatment method different from that of the first pre-treatment unit; a recycling treatment unit for recycling the wastewater that has undergone secondary pre-treatment; and a control unit for controlling the first and second pre-treatment units and the recycling treatment unit, wherein the first pre-treatment unit comprises: an oxidation and reduction reaction treatment unit for pre-treating wastewater in a first treatment method using an oxidizing agent and a reducing agent; a plasma treatment unit for pre-treating wastewater in a second treatment method using plasma; and an ultrasonic treatment unit for pre-treating wastewater in a third treatment method using ultrasonic waves.

Description

Secondary battery separator manufacturing process wastewater treatment system and method

[0001] The present invention relates to a membrane wastewater treatment system for treating wastewater generated in a membrane manufacturing process and a membrane wastewater treatment method thereof.

[0002] Generally, in the membrane manufacturing process, wastewater with various characteristics may be generated during the process of applying a ceramic coating agent to the membrane surface and washing and drying the residual coating agent.

[0003] Such wastewater can be generated primarily in the coating, washing, and drying processes, respectively, and wastewater with different characteristics may be produced depending on the process.

[0004] For example, wastewater generated during the coating process contains ceramic particles, such as silica (SiO2) existing in the form of fine particles as a component of ceramic coating agents and alumina (Al2O3) acting as a reinforcing agent within the coating agent. Since these particles exist in a colloidal form, they do not settle in water using conventional sedimentation methods, making treatment difficult.

[0005] Furthermore, wastewater generated during the washing process, which primarily occurs during the cleaning of membrane production equipment and surfaces, contains high concentrations of salts such as sodium chloride (NaCl) used in the washing water and process components, as well as organic solvents derived from coating agents or process aids. Consequently, a salt-in effect may occur due to the high salt concentration, a unique and strong odor may develop from the residue of organic solvents, and the organic matter in the wastewater may lead to a decrease in BOD and COD treatment efficiency.

[0006] Furthermore, the wastewater generated during the drying process consists of evaporated and condensed water. It may contain trace amounts of organic compounds and small amounts of metal ions resulting from the condensation of organic compounds vaporized during the drying process. Since the concentrations of organic and inorganic components in the wastewater are low, it has the potential for recycling. Although the amount of wastewater generated is small, it has the characteristic of being recyclable in recovery or membrane manufacturing processes if properly treated.

[0007] However, existing wastewater treatment technologies had limitations in effectively treating wastewater generated during the membrane manufacturing process due to the complex characteristics of such wastewater.

[0008] In particular, in the case of colloidal silica and alumina present in wastewater, coagulation and sedimentation are difficult, requiring advanced filtration; there were technical difficulties in removing characteristic odors and treating microorganisms in wastewater, and there was no method to recover recyclable silica and alumina.

[0009] In addition, existing wastewater treatment methods faced the problem of increased treatment costs and a heavier environmental burden because simultaneous treatment was difficult when organic solvents, high-concentration salts, and ceramic components were mixed in the wastewater.

[0010] Therefore, there is a need to develop a membrane wastewater treatment system capable of effectively and optimally treating wastewater mixed with organic solvents, high-concentration salts, and ceramic components generated at each stage of the membrane manufacturing process.

[0011] One objective of the present invention for solving the problems described above is to provide a membrane wastewater treatment system and method capable of efficiently treating and recycling wastewater with complex characteristics generated in a membrane manufacturing process by performing primary and secondary pretreatment and recycling treatment on the wastewater generated in the membrane manufacturing process.

[0012] The problems that the present invention aims to solve are not limited to those mentioned above, and other unmentioned problems will be clearly understood by a person skilled in the art from the description below.

[0013] A membrane wastewater treatment system according to an embodiment of the present invention for solving the above-mentioned problem comprises a collection tank for collecting and storing wastewater generated in a membrane manufacturing process, a first pretreatment unit for primary pretreatment of wastewater stored in the collection tank, a second pretreatment unit for secondary pretreatment of wastewater that has been primary pretreated using a treatment method different from that of the first treatment unit, a recycling treatment unit for recycling wastewater that has been secondary pretreated, and a control unit for controlling the first and second pretreatment units and the recycling treatment unit. The first pretreatment unit comprises an oxidation and reduction reaction treatment unit for primary pretreatment of wastewater using a first treatment method utilizing an oxidizing agent and a reducing agent, a plasma treatment unit for primary pretreatment of wastewater using a second treatment method utilizing plasma, and an ultrasonic treatment unit for primary pretreatment of wastewater using an ultrasonic treatment method. The control unit determines at least one of the first, second, and third treatment methods based on the characteristics of the wastewater, and controls at least one of the oxidation and reduction reaction treatment unit, the plasma treatment unit, and the ultrasonic treatment unit to primary pretreat wastewater using the determined treatment method.

[0014] In an embodiment, the oxidation and reduction reaction treatment unit can decompose at least a portion of the organic matter contained in the wastewater and remove at least a portion of the salt contained in the wastewater by gasifying it through an oxidation and reduction reaction utilizing an oxidizing agent and a reducing agent according to a control signal of the control unit.

[0015] In an embodiment, the plasma treatment unit can decompose at least a portion of the organic matter contained in wastewater through active species including electrons, ions, and radicals generated in the plasma, as well as ultraviolet rays and shock waves.

[0016] In an example, the ultrasonic treatment unit can decompose at least some of the organic matter and colloids contained in the wastewater through ultrasonic irradiation.

[0017] In an embodiment, the collection tank may include a wastewater inlet pipe into which wastewater generated in a membrane manufacturing process flows, a wastewater discharge pipe into which primary pretreatment wastewater stored in the collection tank is discharged to a second pretreatment unit, and a return water inlet pipe into which return water returned from the second pretreatment unit and the recycling treatment unit flows.

[0018] In an embodiment, the oxidation and reduction reaction treatment unit of the first pretreatment unit is positioned around the collection tank and connected to the collection tank through the first pipe and the second pipe, and when wastewater stored in the collection tank flows in through the first pipe, the inflowing wastewater is pretreated in the first stage, and the wastewater that has completed the first stage pretreatment can be discharged to the collection tank through the second pipe.

[0019] In an embodiment, the plasma treatment unit of the first pretreatment unit is placed directly in the collection tank and can plasma treat the wastewater stored in the collection tank by generating plasma.

[0020] In an embodiment, the ultrasonic treatment unit of the first pretreatment unit is positioned in at least one of the wastewater inlet pipe and the wastewater discharge pipe of the collection tank and can ultrasonically treat the wastewater flowing in the wastewater inlet pipe and the wastewater discharge pipe.

[0021] In an embodiment, the first pretreatment unit may further include a solid treatment unit that performs at least one of a chemical treatment method that removes solids by coagulating impurities through chemical treatment of wastewater stored in a collection tank and a mechanical treatment method that removes solids by filtering impurities through mechanical treatment of wastewater stored in a collection tank.

[0022] In an embodiment, the second pretreatment unit may include a membrane filtration treatment unit that performs a second pretreatment of wastewater that has been first pretreated by a fourth treatment method using an ultrafine filtration membrane, and a buffer tank that temporarily stores the second pretreated wastewater and supplies it to a recycling treatment unit at a constant flow rate.

[0023] In an embodiment, the membrane filtration treatment unit can perform secondary pretreatment of the wastewater using a membrane filtration treatment method that removes organic matter, colloids, and solids contained in the primary pretreated wastewater using an ultrafine filtration membrane according to a control signal from the control unit.

[0024] In an example, the membrane filtration treatment unit is connected to the return water inlet pipe of the collection tank and can return a portion of the secondary pretreated wastewater to the collection tank through the return water inlet pipe.

[0025] In an embodiment, the recycling treatment unit may include a reverse electrodialysis unit that separates and removes salts contained in wastewater into cations and anions, and a deodorization unit that removes odor components of contaminated air generated from wastewater.

[0026] In an embodiment, the reverse electrodialysis unit can perform wastewater recycling treatment by separating and removing salts contained in the secondary pretreated wastewater into cations and anions according to a control signal from the control unit, and by removing scale and contamination formed on the cation exchange membrane and anion exchange membrane through the polarity reversal of the electrodes at regular intervals.

[0027] In an embodiment, the reverse electrodialysis unit is connected to the return water inlet pipe of the collection tank and can return a portion of the recycled wastewater to the collection tank through the return water inlet pipe.

[0028] In an embodiment, the control unit, upon receiving a wastewater treatment request through a user terminal or an external server, analyzes the characteristics of the wastewater stored in a collection tank and determines at least one of the first, second, and third treatment methods based on the results of the analyzed wastewater characteristics; controls the first pretreatment unit to pretreat the wastewater using the determined first pretreatment method; controls the second pretreatment unit to pretreat the wastewater when the wastewater pretreated in the first method is moved to the second pretreatment unit; and controls the recycling unit to recycle the wastewater when the wastewater pretreated in the second method is moved to the recycling treatment unit.

[0029] In an embodiment, when analyzing the characteristics of wastewater, the control unit can analyze the characteristics of the wastewater based on the size and type of pollutants contained in the wastewater and the content of the pollutants.

[0030] A membrane wastewater treatment method of a membrane wastewater treatment system according to one embodiment of the present invention comprises the steps of collecting and storing wastewater generated in a membrane manufacturing process, performing a first pretreatment of the stored wastewater, performing a second pretreatment of the first pretreated wastewater, and recycling the second pretreated wastewater. The first pretreatment step may determine at least one of a first treatment method using an oxidizing agent and a reducing agent, a second treatment method using plasma, and a third treatment method using ultrasound based on the characteristics of the wastewater, and may perform the first pretreatment of the wastewater using the determined treatment method.

[0031] In addition to this, other methods for implementing the present invention, other systems, and computer-readable recording media for recording a computer program for executing said method may be further provided.

[0032] As described above, according to the present invention, by performing primary and secondary pretreatment and recycling treatment on wastewater generated in the membrane manufacturing process, wastewater with complex characteristics generated in the membrane manufacturing process can be efficiently treated and recycled.

[0033] In addition, the present invention can effectively process and recover colloidal ceramic particles, such as silica (SiO2) and alumina (Al2O3), enabling their recycling into high-value-added materials.

[0034] In addition, the present invention can effectively treat non-biodegradable organic substances and hazardous chemicals through complex treatment, and the treatment efficiency is improved, allowing for effective sludge treatment without outsourcing, thereby reducing costs.

[0035] In addition, the present invention reduces OPEX (operating costs) by implementing a zero-discharge system to minimize environmental burden and reducing water usage by recycling treated water as industrial water or cooling tower makeup water, and enables stable continuous operation through an automatic cleaning function and a process water discharge system.

[0036] In addition, the present invention can improve the working environment and prevent air pollution by removing volatile organic compounds (VOCs) and odors through a deodorizing device.

[0037] The effects of the present invention are not limited to those mentioned above, and other unmentioned effects will be clearly understood by a person skilled in the art from the description below.

[0038] FIG. 1 is a diagram illustrating the overall operation of a membrane wastewater treatment system according to one embodiment of the present invention.

[0039] FIG. 2 is a diagram illustrating the operation of a first pretreatment unit of a membrane wastewater treatment system according to one embodiment of the present invention.

[0040] FIG. 3 is a diagram illustrating the operation of a second pretreatment unit of a membrane wastewater treatment system according to one embodiment of the present invention.

[0041] FIG. 4 is a diagram illustrating the operation of a recycling treatment unit of a membrane wastewater treatment system according to one embodiment of the present invention.

[0042] FIG. 5 is a diagram illustrating the overall wastewater treatment process of a membrane wastewater treatment system according to one embodiment of the present invention.

[0043] FIG. 6 is a diagram illustrating the treatment effect of a membrane wastewater treatment system according to one embodiment of the present invention.

[0044] FIG. 7 is a diagram illustrating the control process of a control unit of a membrane wastewater treatment system according to one embodiment of the present invention.

[0045] FIG. 8 is a diagram illustrating experimental result data of a membrane wastewater treatment system according to one embodiment of the present invention.

[0046] FIG. 9 is a drawing showing a photograph of a recycled material analyzed according to the treatment results of a membrane wastewater treatment system according to one embodiment of the present invention.

[0047] The advantages and features of the present invention and the methods for achieving them will become clear by referring to the embodiments described below in detail together with the accompanying drawings. However, the present invention is not limited to the embodiments disclosed below but may be implemented in various different forms. These embodiments are provided merely to ensure that the disclosure of the present invention is complete and to fully inform those skilled in the art of the scope of the present invention, and the present invention is defined only by the scope of the claims.

[0048] The terms used in this specification are for describing embodiments and are not intended to limit the invention. In this specification, the singular form includes the plural form unless specifically stated otherwise in the text. The terms "comprises" and / or "comprising" used in this specification do not exclude the presence or addition of one or more other components in addition to the components mentioned. Throughout the specification, the same reference numerals refer to the same components, and "and / or" includes each of the mentioned components and all combinations of one or more. Although terms such as "first," "second," etc., are used to describe various components, these components are not limited by these terms. These terms are used merely to distinguish one component from another. Therefore, the first component mentioned below may be the second component within the technical scope of the invention.

[0049] Unless otherwise defined, all terms used herein (including technical and scientific terms) may be used in a meaning commonly understood by those skilled in the art to which the present invention pertains. Additionally, terms defined in commonly used dictionaries are not to be interpreted ideally or excessively unless explicitly and specifically defined otherwise.

[0050] Hereinafter, embodiments of the present invention will be described in detail with reference to the attached drawings.

[0051] Prior to the explanation, the meanings of the terms used in this specification are briefly explained. However, since the explanation of terms is intended to aid in understanding this specification, it should be noted that they are not used to limit the technical scope of the invention unless explicitly stated to be a limiting factor.

[0052] FIG. 1 is a diagram illustrating the overall operation of a membrane wastewater treatment system according to one embodiment of the present invention.

[0053] As illustrated in FIG. 1, the membrane wastewater treatment system (100) of the present invention may include a collection tank (110) for collecting and storing wastewater generated in a membrane manufacturing process, a first pretreatment unit (120) for first pretreatment of wastewater stored in the collection tank (110), a second pretreatment unit (130) for second pretreatment of wastewater that has been first pretreated using a different treatment method than that of the first treatment unit (120), a recycling treatment unit (140) for recycling wastewater that has been second pretreated, and a control unit (150) for controlling the first and second pretreatment units (120, 130) and the recycling treatment unit (140).

[0054] Here, the first pretreatment unit (120) may include an oxidation and reduction reaction treatment unit that pretreats wastewater using a first treatment method utilizing an oxidizing agent and a reducing agent, a plasma treatment unit that pretreats wastewater using a second treatment method utilizing plasma, and an ultrasonic treatment unit that pretreats wastewater using a third treatment method utilizing ultrasound.

[0055] The oxidation and reduction reaction treatment unit of the first pretreatment unit (120) can decompose at least a portion of the organic matter contained in the wastewater and remove at least a portion of the salt contained in the wastewater by gasifying it through an oxidation and reduction reaction using an oxidizing agent and a reducing agent according to a control signal of the control unit (150).

[0056] For example, the oxidation and reduction reaction treatment unit comprises an oxidizing agent containing one or more types of radicals and hydrogen ions (H + ) and hydrated electrons (e - aq A reducing agent containing ) can be produced, and oxidation and reduction reaction treatments can be performed using the produced oxidizing agent and reducing agent.

[0057] Here, the oxidation and reduction reaction treatment unit can perform oxidation and reduction reaction treatment by simultaneously carrying out an oxidation reaction by an oxidizing agent and a reduction reaction by a reducing agent.

[0058] In addition, the oxidation and reduction reaction treatment unit utilizes hydroxy radicals (·OH) or superoxide anion radicals (O2 .- An oxidizing agent containing one or more radicals can be produced, but this is only one example and is not limited thereto.

[0059] Next, the plasma treatment unit of the first pretreatment unit (120) can decompose at least some of the organic matter contained in the wastewater through active species including electrons, ions, and radicals generated in the plasma, as well as ultraviolet rays and shock waves.

[0060] And, the ultrasonic treatment unit of the first pretreatment unit (120) can decompose at least some of the organic matter and colloids contained in the wastewater through ultrasonic irradiation.

[0061] Here, the ultrasonic treatment unit may include a pipe-type ultrasonic treatment unit disposed in at least one of a wastewater inlet pipe through which wastewater flows into the collection tank (110) and a wastewater discharge pipe through which wastewater is discharged from the collection tank (110).

[0062] For example, a pipe-type ultrasonic treatment device can ultrasonically treat wastewater flowing through a wastewater inlet pipe and a wastewater discharge pipe.

[0063] The first preprocessing unit (120) having such a configuration can operate according to a control signal from the control unit (150).

[0064] Here, the control unit (150) can determine at least one of a first treatment method using an oxidizing agent and a reducing agent based on the characteristics of the wastewater, a second treatment method using plasma, and a third treatment method using ultrasound, and can control at least one of an oxidation and reduction reaction treatment unit, a plasma treatment unit, and an ultrasound treatment unit to pre-treat the wastewater using the determined treatment method.

[0065] Additionally, the first pretreatment unit (120) may further include a solid treatment unit that performs at least one of a chemical treatment method in which impurities are coagulated and solids are removed from wastewater stored in the collection tank (110) through chemical treatment, and a mechanical treatment method in which impurities are filtered and solids are removed from wastewater stored in the collection tank (110) through mechanical treatment.

[0066] Here, the solid treatment unit of the first pretreatment unit (120) may include a CC (Chemical Coagulation) device that performs a chemical treatment method and an APF (Automatic Pressure Filter) device that performs a mechanical treatment method. The APF may be an automatic pressure dehydrator.

[0067] At this time, the control unit (150) can determine at least one of a chemical treatment method and a mechanical treatment method based on the characteristics of the wastewater, and control the solid treatment unit to remove solids from the wastewater using the determined treatment method.

[0068] For example, the control unit (150) can analyze the characteristics of wastewater and, based on the analysis results, control the solid treatment unit to remove solids from wastewater using both chemical treatment and mechanical treatment methods when the content of impurities including slurry, polymer, colloid, and suspended matter in the wastewater exceeds a preset threshold, and to remove solids from wastewater using either chemical treatment or mechanical treatment methods when the content of impurities including slurry, polymer, colloid, and suspended matter in the wastewater is below a preset threshold.

[0069] Additionally, the control unit (150) can determine the priority between the chemical treatment method and the mechanical treatment method when the impurity content in the wastewater exceeds a preset threshold, and control the solid treatment unit to remove solids from the wastewater using both the chemical treatment method and the mechanical treatment method according to the priority.

[0070] For example, the control unit (150) can determine the priority of removing solids from wastewater by first using a mechanical treatment method and removing solids from wastewater by second using a chemical treatment method when the content of impurities contained in wastewater exceeds a preset threshold.

[0071] That is, the control unit (150) can control the solid treatment unit to analyze the size of the impurities when the impurity content in the wastewater is below a preset threshold, and to remove the solids in the wastewater using a mechanical treatment method when the size of the impurities exceeds a preset threshold size as a result of the size analysis, and to remove the solids in the wastewater using a chemical treatment method when the size of the impurities is below a preset threshold size as a result of the size analysis.

[0072] Additionally, the collection tank (110) may include a wastewater inlet pipe into which wastewater generated in the membrane manufacturing process flows, a wastewater discharge pipe into which primary pretreatment wastewater stored in the collection tank (110) is discharged to a second pretreatment unit (130), and a return water inlet pipe into which return water returned from the second pretreatment unit (130) and the recycling treatment unit (140) flows.

[0073] Here, the oxidation and reduction reaction treatment unit of the first pretreatment unit (120) is positioned around the collection tank (110) and connected to the collection tank (110) through the first pipe and the second pipe, and when wastewater stored in the collection tank (110) flows in through the first pipe, the flowing wastewater is pretreated in the first stage, and the wastewater that has completed the first stage pretreatment can be discharged to the collection tank (110) through the second pipe.

[0074] In addition, the plasma treatment unit of the first pretreatment unit (120) is placed directly in the collection tank (110) and can generate plasma in the wastewater stored in the collection tank (110) to plasma treat the wastewater.

[0075] In some cases, the plasma treatment unit of the first pretreatment unit (120) is placed in a sub-collection tank connected to the collection tank (110) through the third and fourth pipes, and when wastewater stored in the collection tank (110) flows into the sub-collection tank through the third pipe, the wastewater flowing into the sub-collection tank is plasma treated, and the plasma-treated wastewater can be discharged to the collection tank through the fourth pipe.

[0076] In addition, the ultrasonic treatment unit of the first pretreatment unit (120) is positioned in at least one of the wastewater inlet pipe and the wastewater discharge pipe of the collection tank (110) to ultrasonically treat the wastewater flowing in the wastewater inlet pipe and the wastewater discharge pipe.

[0077] Next, the second pretreatment unit (130) may include a membrane filtration treatment unit that performs a second pretreatment of wastewater that has been first pretreated using a fourth treatment method using an ultrafine filtration membrane, and a buffer tank that temporarily stores the second pretreated wastewater and supplies it to a recycling treatment unit (140) at a constant flow rate.

[0078] Here, the membrane filtration treatment unit can perform secondary pretreatment of wastewater using a membrane filtration treatment method that removes organic matter, colloids, and solids contained in primary pretreated wastewater using an ultrafine filtration membrane according to a control signal of the control unit (150).

[0079] For example, the ultrafine filtration membrane of the membrane filtration treatment unit may include an Ultrafiltration (UF) membrane made of ceramic material.

[0080] Additionally, the membrane filtration treatment unit is connected to the return water inlet pipe of the collection tank (110) and can return a portion of the secondary pre-treated wastewater to the collection tank (110) through the return water inlet pipe.

[0081] Next, the recycling treatment unit (140) may include a reverse electrodialysis unit that separates and removes salts contained in wastewater into cations and anions, and a deodorization unit that removes odor components of contaminated air generated from wastewater.

[0082] Here, the reverse electrodialysis unit can perform wastewater recycling treatment by separating and removing salts contained in the secondary pretreated wastewater into cations and anions according to the control signal of the control unit (150), and by removing scale and contamination formed on the cation exchange membrane and anion exchange membrane through the polarity reversal of the electrodes at regular intervals.

[0083] Additionally, the reverse electrodialysis unit is connected to the return water inlet pipe of the collection tank (110) and can return a portion of the recycled wastewater to the collection tank (110) through the return water inlet pipe.

[0084] Here, the return water inlet pipe can be connected in parallel to the collection tank (110), the second pretreatment unit (130), and the recycling treatment unit (140).

[0085] And, the recycling processing unit (140) can recycle wastewater that has been secondarily pretreated through a reverse electrodialysis unit to produce non-discharge recycled water, and can deodorize and purify the contaminated air generated from the wastewater through a deodorization unit.

[0086] Meanwhile, the control unit (150) can, upon receiving a wastewater treatment request through a user terminal or an external server, analyze the characteristics of the wastewater stored in the collection tank (110), determine at least one of the first, second, and third treatment methods based on the results of the analyzed wastewater characteristics, control the first pretreatment unit (120) to pretreat the wastewater using the determined first pretreatment method, control the second pretreatment unit (130) to pretreat the wastewater when the wastewater pretreated in the first pretreatment is moved to the second pretreatment unit (130), and control the recycling unit (140) to recycle the wastewater when the wastewater pretreated in the second pretreatment is moved to the recycling treatment unit (140).

[0087] Here, the control unit (150) can analyze the characteristics of wastewater based on the size and type of pollutants included in the wastewater and the content of the pollutants when analyzing the characteristics of wastewater.

[0088] For example, when determining the first pretreatment method, the control unit (150) can control the oxidation and reduction reaction treatment unit, the plasma treatment unit, and the ultrasonic treatment unit to all operate so that the first, second, and third treatment methods are all performed if the characteristic value of the analyzed wastewater is greater than or equal to a preset maximum standard value, and controls the oxidation and reduction reaction treatment unit, the plasma treatment unit, and the ultrasonic treatment unit to only operate so that only one of the first, second, and third treatment methods is performed if the characteristic value of the analyzed wastewater is less than a preset minimum standard value, and controls the oxidation and reduction reaction treatment unit, the plasma treatment unit, and the ultrasonic treatment unit to only operate so that two of the first, second, and third treatment methods are performed if the characteristic value of the analyzed wastewater is less than a preset maximum standard value and greater than or equal to a preset minimum standard value.

[0089] In some cases, the control unit (150) may determine the priority for the first, second, and third treatment methods based on the size and type of pollutants contained in the wastewater when the characteristic value of the analyzed wastewater is greater than or equal to a preset maximum reference value, and may control the order of operation of the oxidation and reduction reaction treatment unit, the plasma treatment unit, and the ultrasonic treatment unit according to the determined priority.

[0090] In another case, the control unit (150) may determine the priority of two selected treatment methods among the first, second, and third treatment methods based on the size and type of pollutants contained in the wastewater when the characteristic value of the analyzed wastewater is less than a preset maximum standard value and greater than or equal to a minimum standard value, and may control the order of operation of the treatment units corresponding to the two selected treatment methods among the oxidation and reduction reaction treatment unit, the plasma treatment unit, and the ultrasonic treatment unit according to the determined priority.

[0091] In this way, the present invention can efficiently treat and recycle wastewater with complex characteristics generated in a membrane manufacturing process by performing primary and secondary pretreatment and recycling treatment on the wastewater generated in the membrane manufacturing process.

[0092] In addition, the present invention can effectively process and recover colloidal ceramic particles, such as silica (SiO2) and alumina (Al2O3), enabling their recycling into high-value-added materials.

[0093] In addition, the present invention can effectively treat non-biodegradable organic substances and hazardous chemicals through complex treatment, and the treatment efficiency is improved, allowing for effective sludge treatment without outsourcing, thereby reducing costs.

[0094] In addition, the present invention reduces OPEX (operating costs) by implementing a zero-discharge system to minimize environmental burden and reducing water usage by recycling treated water as industrial water or cooling tower makeup water, and enables stable continuous operation through an automatic cleaning function and a process water discharge system.

[0095] In addition, the present invention can improve the working environment and prevent air pollution by removing volatile organic compounds (VOCs) and odors through a deodorizing device.

[0096] FIG. 2 is a diagram illustrating the operation of a first pretreatment unit of a membrane wastewater treatment system according to one embodiment of the present invention.

[0097] As illustrated in FIG. 2, the first pretreatment unit (120) of the present invention may include an oxidation and reduction reaction treatment unit (122) that pretreats wastewater using a first treatment method utilizing an oxidizing agent and a reducing agent, a plasma treatment unit (124) that pretreats wastewater using a second treatment method utilizing plasma, an ultrasonic treatment unit (126) that pretreats wastewater using a third treatment method utilizing ultrasound, and a solids treatment unit (128) that removes solids from wastewater using a chemical treatment method and a mechanical treatment method.

[0098] Here, the oxidation and reduction reaction treatment unit (122) can decompose at least a portion of the organic matter contained in the wastewater and remove at least a portion of the salt contained in the wastewater by gasifying it through an oxidation and reduction reaction using an oxidizing agent and a reducing agent according to a control signal of the control unit (150).

[0099] For example, the oxidation and reduction reaction treatment unit (122) comprises an oxidizing agent containing one or more types of radicals and hydrogen ions (H + ) and hydrated electrons (e - aq A reducing agent containing ) can be produced, and oxidation and reduction reaction treatments can be performed using the produced oxidizing agent and reducing agent.

[0100] In addition, the oxidation and reduction reaction treatment unit (122) can perform oxidation and reduction reaction treatment by simultaneously carrying out an oxidation reaction by an oxidizing agent and a reduction reaction by a reducing agent.

[0101] In addition, the oxidation and reduction reaction treatment unit (122) is a hydroxy radical (·OH) or a superoxide anion radical (O2 .- An oxidizing agent containing one or more radicals can be produced, but this is only one example and is not limited thereto.

[0102] Next, the plasma treatment unit (124) can decompose at least some of the organic matter contained in the wastewater through active species including electrons, ions, and radicals generated in the plasma, as well as ultraviolet rays and shock waves.

[0103] And, the ultrasonic treatment unit (126) can decompose at least some of the organic matter and colloids contained in the wastewater through ultrasonic irradiation.

[0104] Here, the ultrasonic treatment unit (126) may include a pipe-type ultrasonic treatment unit positioned in at least one of a wastewater inlet pipe through which wastewater flows into a collection tank and a wastewater discharge pipe through which wastewater is discharged from the collection tank, wherein the pipe-type ultrasonic treatment unit can ultrasonically treat wastewater flowing through the wastewater inlet pipe and the wastewater discharge pipe.

[0105] Next, the control unit (150) can determine at least one of a first treatment method using an oxidizing agent and a reducing agent based on the characteristics of the wastewater, a second treatment method using plasma, and a third treatment method using ultrasound, and control at least one of an oxidation and reduction reaction treatment unit (122), a plasma treatment unit (124), and an ultrasound treatment unit (126) to pre-treat the wastewater using the determined treatment method.

[0106] Here, the control unit (150) can analyze the characteristics of wastewater based on the size and type of pollutants included in the wastewater and the content of the pollutants when analyzing the characteristics of wastewater.

[0107] For example, the control unit (150) can control the oxidation and reduction reaction treatment unit (122), the plasma treatment unit (124), and the ultrasonic treatment unit (126) to all operate so that the first, second, and third treatment methods are all performed when the characteristic value of the analyzed wastewater is greater than or equal to a preset maximum standard value; it can control the oxidation and reduction reaction treatment unit (122), the plasma treatment unit (124), and the ultrasonic treatment unit (126) to only one of the first, second, and third treatment methods to operate when the characteristic value of the analyzed wastewater is less than a preset minimum standard value; and it can control the oxidation and reduction reaction treatment unit (122), the plasma treatment unit (124), and the ultrasonic treatment unit (126) to only two of the first, second, and third treatment methods to operate when the characteristic value of the analyzed wastewater is less than a preset maximum standard value and greater than or equal to a preset minimum standard value.

[0108] In some cases, the control unit (150) may determine the priority for the first, second, and third treatment methods based on the size and type of pollutants contained in the wastewater when the characteristic value of the analyzed wastewater is greater than or equal to a preset maximum reference value, and may control the operation order of the oxidation and reduction reaction treatment unit (122), the plasma treatment unit (124), and the ultrasonic treatment unit (126) according to the determined priority.

[0109] In another case, the control unit (150) may determine the priority of two selected treatment methods among the first, second, and third treatment methods based on the size and type of pollutants contained in the wastewater when the characteristic value of the analyzed wastewater is less than a preset maximum standard value and greater than or equal to a minimum standard value, and may control the order of operation of the treatment units corresponding to the two selected treatment methods among the oxidation and reduction reaction treatment unit (122), plasma treatment unit (124), and ultrasonic treatment unit (126) according to the determined priority.

[0110] In addition, the solid treatment unit (128) of the first pretreatment unit (120) can perform at least one of a chemical treatment method that removes solids by coagulating impurities through chemical treatment of wastewater stored in a collection tank, and a mechanical treatment method that removes solids by filtering impurities through mechanical treatment of wastewater stored in a collection tank.

[0111] Here, the solids treatment unit (128) may include a Chemical Coagulation (CC) device that performs a chemical treatment method and an Automatic Pressure Filter (APF) device that performs a mechanical treatment method.

[0112] At this time, the control unit (150) can determine at least one of a chemical treatment method and a mechanical treatment method based on the characteristics of the wastewater, and control the solid treatment unit (128) to remove solids from the wastewater using the determined treatment method.

[0113] For example, the control unit (150) can analyze the characteristics of wastewater and, based on the analysis results, control the solid treatment unit (128) to remove solids from wastewater using both chemical treatment and mechanical treatment methods if the content of impurities including slurry, polymer, colloid, and suspended matter in the wastewater exceeds a preset threshold, and to remove solids from wastewater using either chemical treatment or mechanical treatment methods if the content of impurities including slurry, polymer, colloid, and suspended matter in the wastewater is below a preset threshold.

[0114] Additionally, the control unit (150) can determine the priority between the chemical treatment method and the mechanical treatment method when the impurity content in the wastewater exceeds a preset threshold, and control the solid treatment unit (128) to remove solids from the wastewater using both the chemical treatment method and the mechanical treatment method according to the priority.

[0115] For example, the control unit (150) can determine the priority of removing solids from wastewater by first using a mechanical treatment method and removing solids from wastewater by second using a chemical treatment method when the content of impurities contained in wastewater exceeds a preset threshold.

[0116] That is, the control unit (150) can control the solid treatment unit (128) to analyze the size of the impurities when the impurity content in the wastewater is below a preset threshold, and to remove the solids in the wastewater using a mechanical treatment method when the size of the impurities exceeds a preset threshold size as a result of the size analysis, and to remove the solids in the wastewater using a chemical treatment method when the size of the impurities is below a preset threshold size as a result of the size analysis.

[0117] FIG. 3 is a diagram illustrating the operation of a second pretreatment unit of a membrane wastewater treatment system according to one embodiment of the present invention.

[0118] As illustrated in FIG. 3, the second pretreatment unit (130) of the present invention may include a membrane filtration treatment unit (132) that performs a second pretreatment of wastewater that has been first pretreated by a fourth treatment method using an ultrafine filtration membrane, and a buffer tank (134) that temporarily stores the second pretreated wastewater and supplies it to a recycling treatment unit at a constant flow rate.

[0119] Here, the membrane filtration treatment unit (132) can perform secondary pretreatment of wastewater using a membrane filtration treatment method that removes organic matter, colloids, and solids contained in primary pretreated wastewater using an ultrafine filtration membrane according to a control signal from the control unit (150).

[0120] For example, the ultrafine filtration membrane of the membrane filtration processing unit (132) may include an Ultrafiltration (UF) membrane made of a ceramic material, but this is only one example and is not limited thereto.

[0121] Additionally, the membrane filtration treatment unit (132) is connected to the return water inlet pipe of the collection tank and can return a portion of the secondary pre-treated wastewater to the collection tank through the return water inlet pipe.

[0122] FIG. 4 is a diagram illustrating the operation of a recycling treatment unit of a membrane wastewater treatment system according to one embodiment of the present invention.

[0123] As illustrated in FIG. 4, the recycling treatment unit (140) of the present invention may include a reverse electrodialysis unit (142) that separates and removes salts contained in wastewater into cations and anions, and a deodorization unit (144) that removes odor components of contaminated air generated from wastewater.

[0124] Here, the reverse electrodialysis unit (142) can perform wastewater recycling treatment by separating and removing salts contained in the secondary pretreated wastewater into cations and anions according to the control signal of the control unit (150), and by removing scale and contamination formed on the cation exchange membrane and anion exchange membrane through the polarity reversal of the electrodes at regular intervals.

[0125] Additionally, the reverse electric dialysis unit (142) is connected to the return water inlet pipe of the collection tank and can return a portion of the recycled wastewater to the collection tank through the return water inlet pipe.

[0126] And, the recycling processing unit (140) can recycle wastewater that has been secondarily pretreated through the reverse electrodialysis unit (142) to produce non-discharge recycled water, and deodorize and purify the contaminated air generated from the wastewater through the deodorization unit (144).

[0127] FIG. 5 is a diagram illustrating the overall wastewater treatment process of a membrane wastewater treatment system according to one embodiment of the present invention.

[0128] As illustrated in FIG. 5, the present invention can collect wastewater generated during the membrane manufacturing process and store it in a collection tank (110).

[0129] Next, the present invention can pre-treat wastewater stored in a collection tank (110).

[0130] Here, the first pretreatment can be performed through an oxidation and reduction reaction treatment unit (122) that pretreats wastewater using a first treatment method utilizing an oxidizing agent and a reducing agent, a plasma treatment unit (124) that pretreats wastewater using a second treatment method utilizing plasma, an ultrasonic treatment unit (126) that pretreats wastewater using a third treatment method utilizing ultrasound, and a solids treatment unit (128) that removes solids from wastewater using a chemical treatment method and a mechanical treatment method.

[0131] The oxidation and reduction reaction treatment unit (122) can use an Advanced Redox Process (ARP) device, which can decompose at least some of the organic matter contained in the wastewater and remove at least some of the salt contained in the wastewater by gasifying it through an oxidation and reduction reaction using an oxidizing agent and a reducing agent.

[0132] And, the plasma treatment unit (124) can decompose at least some of the organic matter contained in the wastewater through active species including electrons, ions, and radicals generated in the plasma, as well as ultraviolet rays and shock waves.

[0133] Next, the ultrasonic treatment unit (126) can decompose at least some of the organic matter and colloids contained in the wastewater through ultrasonic irradiation, and may include a pipe-type ultrasonic treatment unit (Ultrasonic Wave) that is positioned in at least one of the wastewater inlet pipe through which the wastewater flows into the collection tank and the wastewater discharge pipe through which the wastewater is discharged from the collection tank, and ultrasonically treats the wastewater flowing in the wastewater inlet pipe and the wastewater discharge pipe.

[0134] Next, the solid waste treatment unit (128) can perform at least one of a chemical treatment method in which impurities are coagulated and solid waste is removed from wastewater stored in the collection tank (110) through chemical treatment, and a mechanical treatment method in which impurities are filtered and solid waste is removed from wastewater stored in the collection tank (110) through mechanical treatment.

[0135] Here, the solids treatment unit (128) may include a Chemical Coagulation (CC) device that performs a chemical treatment method and an Automatic Pressure Filter (APF) device that performs a mechanical treatment method.

[0136] In addition, the present invention can perform secondary pretreatment of primary pretreated wastewater.

[0137] Here, the second pretreatment process can be performed by first pretreating wastewater using a fourth treatment method with an ultrafine filtration membrane through a membrane filtration treatment unit (132), and then second pretreating the wastewater by temporarily storing it in a buffer tank (134) and supplying it to a recycling treatment unit (140) at a constant flow rate.

[0138] The membrane filtration treatment unit (132) can perform secondary pretreatment of wastewater using a membrane filtration treatment method that removes organic matter, colloids, and solid matter contained in primary pretreated wastewater using an ultrafine filtration membrane.

[0139] For example, the ultrafine filtration membrane of the membrane filtration processing unit (132) may include an Ultrafiltration (UF) membrane made of ceramic material.

[0140] Additionally, the membrane filtration treatment unit (132) is connected to the return water inlet pipe of the collection tank (110) and can return a portion of the secondary pre-treated wastewater to the collection tank (110) through the return water inlet pipe.

[0141] Next, the present invention can recycle secondary pretreated wastewater.

[0142] Here, the recycling process can separate and remove salts contained in wastewater into cations and anions through an Electrodialysis Reversal (EDR) unit (142), and remove odor components of contaminated air generated from wastewater through a deodorizing unit (144).

[0143] The reverse electrodialysis unit (142) can perform wastewater recycling treatment by separating and removing salts contained in the secondary pretreated wastewater into cations and anions, and by removing scale and contamination formed on the cation exchange membrane and anion exchange membrane through the polarity reversal of the electrodes at regular intervals.

[0144] Additionally, the reverse electric dialysis unit (142) is connected to the return water inlet pipe of the collection tank (110) and can return a portion of the recycled wastewater to the collection tank (110) through the return water inlet pipe.

[0145] Here, the return water inlet pipe can be connected in parallel to the collection tank (110), the second pretreatment unit (130), and the recycling treatment unit (140).

[0146] Thus, the present invention can recycle wastewater that has been secondarily pretreated through a reverse electrodialysis unit (142) to produce non-discharge recycled water, and deodorize and purify the contaminated air generated from the wastewater through a deodorization unit (144).

[0147] And, the control unit (150) may include a measurement control system, and when it receives a wastewater treatment request through a user terminal or an external server, it analyzes the characteristics of the wastewater stored in the collection tank (110), and based on the results of the analyzed wastewater characteristics, it determines at least one of the oxidation and reduction reaction treatment unit (122), the plasma treatment unit (124), and the ultrasonic treatment unit (126) as a primary pretreatment method, and can control at least one of the oxidation and reduction reaction treatment unit (122), the plasma treatment unit (124), and the ultrasonic treatment unit (126) to pretreat the wastewater as a primary pretreatment method.

[0148] Additionally, the control unit (150) can control the membrane filtration treatment unit (132) to pre-treat the primary pre-treated wastewater, and control the reverse electrodialysis unit (142) and the deodorization unit (144) to recycle the secondary pre-treated wastewater.

[0149] In this way, the present invention can efficiently treat and recycle wastewater with complex characteristics generated in a membrane manufacturing process by performing primary and secondary pretreatment and recycling treatment on the wastewater generated in the membrane manufacturing process.

[0150] In addition, the present invention can effectively process and recover colloidal ceramic particles, such as silica (SiO2) and alumina (Al2O3), enabling their recycling into high-value-added materials.

[0151] In addition, the present invention can effectively treat non-biodegradable organic substances and hazardous chemicals through complex treatment, and the treatment efficiency is improved, allowing for effective sludge treatment without outsourcing, thereby reducing costs.

[0152] In addition, the present invention reduces OPEX (operating costs) by implementing a zero-discharge system to minimize environmental burden and reducing water usage by recycling treated water as industrial water or cooling tower makeup water, and enables stable continuous operation through an automatic cleaning function and a process water discharge system.

[0153] In addition, the present invention can improve the working environment and prevent air pollution by removing volatile organic compounds (VOCs) and odors through a deodorizing device.

[0154] FIG. 6 is a diagram illustrating the treatment effect of a membrane wastewater treatment system according to one embodiment of the present invention.

[0155] As shown in FIG. 6, the membrane wastewater treatment system of the present invention uses 300V x 380Hz power, 6kgf / ㎠ or more compressed air, and 2 to 3kgf / ㎠ water supply as utilities, and as a special feature, the operating conditions are 15hr / day x 365 days / year, the automatic cleaning cycle is 4hr (EDR - CIP) (where CIP is automatic cleaning, which is Clean In Place in-situ cleaning), and EDR is Electrodialysis Reversal), the process water discharge cycle is 4hr (EDR - concentrated water / electrode water), and it can have a Dual Inline Package (DIP) configuration.

[0156] As a result of performing membrane wastewater treatment under these conditions, the present invention was able to achieve zero hazardous chemicals, zero outsourced treatment, reduced sludge outsourced treatment costs, reduced water usage, reduced OPEX, ROI of 3 years or less, and an ESG management system.

[0157] FIG. 7 is a diagram illustrating the control process of a control unit of a membrane wastewater treatment system according to one embodiment of the present invention.

[0158] As illustrated in FIG. 7, the membrane wastewater treatment system (100) of the present invention may include a first pretreatment unit (120) for first pretreatment of wastewater generated in a membrane manufacturing process, a second pretreatment unit (130) for second pretreatment of the first pretreated wastewater using a treatment method different from that of the first treatment unit (120), a recycling treatment unit (140) for recycling the second pretreated wastewater, and a control unit (150) for controlling the first and second pretreatment units (120, 130) and the recycling treatment unit (140).

[0159] Here, the control unit (150) receives a wastewater treatment request through a user terminal (10) or an external server (20), analyzes the characteristics of the wastewater stored in the collection tank, determines at least one of the first, second, and third treatment methods based on the results of the analyzed wastewater characteristics, controls the first pretreatment unit (120) to pretreat the wastewater using the determined first pretreatment method, controls the second pretreatment unit (130) to pretreat the wastewater when the wastewater pretreated in the first pretreatment is moved to the second pretreatment unit (130), and controls the recycling unit (140) to recycle the wastewater when the wastewater pretreated in the second pretreatment is moved to the recycling treatment unit (140).

[0160] Here, the control unit (150) can analyze the characteristics of wastewater based on the size and type of pollutants included in the wastewater and the content of the pollutants when analyzing the characteristics of wastewater.

[0161] For example, when determining the first pretreatment method, the control unit (150) can control the oxidation and reduction reaction treatment unit, the plasma treatment unit, and the ultrasonic treatment unit to all operate so that the first, second, and third treatment methods are all performed if the characteristic value of the analyzed wastewater is greater than or equal to a preset maximum standard value, and controls the oxidation and reduction reaction treatment unit, the plasma treatment unit, and the ultrasonic treatment unit to only operate so that only one of the first, second, and third treatment methods is performed if the characteristic value of the analyzed wastewater is less than a preset minimum standard value, and controls the oxidation and reduction reaction treatment unit, the plasma treatment unit, and the ultrasonic treatment unit to only operate so that two of the first, second, and third treatment methods are performed if the characteristic value of the analyzed wastewater is less than a preset maximum standard value and greater than or equal to a preset minimum standard value.

[0162] In some cases, the control unit (150) may determine the priority for the first, second, and third treatment methods based on the size and type of pollutants contained in the wastewater when the characteristic value of the analyzed wastewater is greater than or equal to a preset maximum reference value, and may control the order of operation of the oxidation and reduction reaction treatment unit, the plasma treatment unit, and the ultrasonic treatment unit according to the determined priority.

[0163] In another case, the control unit (150) may determine the priority of two selected treatment methods among the first, second, and third treatment methods based on the size and type of pollutants contained in the wastewater when the characteristic value of the analyzed wastewater is less than a preset maximum standard value and greater than or equal to a minimum standard value, and may control the order of operation of the treatment units corresponding to the two selected treatment methods among the oxidation and reduction reaction treatment unit, the plasma treatment unit, and the ultrasonic treatment unit according to the determined priority.

[0164] Meanwhile, the user terminal (10) may include both a standing device such as a PC (Personal Computer), Network TV, HBBTV (Hybrid Broadcast Broadband TV), Smart TV, and IPTV (Internet Protocol TV), and a mobile device or handheld device such as a smartphone, Tablet PC, Notebook, and PDA (Personal Digital Assistant).

[0165] In addition, the network connecting the separation membrane wastewater treatment system (100) of the present invention and the user terminal (10) or the separation membrane wastewater treatment system (100) of the present invention and the external server (20) includes both wired and wireless networks, and is a general term for a communication network that supports various communication standards or protocols for pairing or / and data transmission and reception between the separation membrane wastewater treatment system (100) of the present invention and the user terminal (10) or between the separation membrane wastewater treatment system (100) of the present invention and the external server (20).

[0166] These wired and wireless networks include all communication networks currently or to be supported in the future by standards, and can support all one or more communication protocols for them.

[0167] These wired / wireless networks may be formed by networks for wired connections such as Ethernet, USB (Universal Serial Bus), CVBS (Composite Video Banking Sync), Component, S-Video (analog), DVI (Digital Visual Interface), HDMI (High Definition Multimedia Interface), RGB, and D-SUB, and communication standards or protocols for them, and networks for wireless connections such as Bluetooth, RFID (Radio Frequency Identification), infrared communication (IrDA: infrared Data Association), UWB (Ultra Wideband), ZigBee, DLNA (Digital Living Network Alliance), WLAN (Wireless LAN) (Wi-Fi), Wibro (Wireless broadband), Wimax (World Interoperability for Microwave Access), HSDPA (High Speed ​​Downlink Packet Access), LTE / LTE-A (Long Term Evolution / LTE-Advanced), and Wi-Fi Direct, and communication standards or protocols for them.

[0168] Meanwhile, according to one embodiment of the present invention, the control unit (150) of the membrane wastewater treatment system (100) of the present invention may be composed of one or more cores and may include a processor for data analysis and deep learning, such as a central processing unit (CPU) of a computing device, a general purpose graphics processing unit (GPGPU), and a tensor processing unit (TPU).

[0169] The control unit (150) can read a computer program stored in memory and perform data processing for machine learning according to an embodiment of the present invention. The control unit (150) can perform operations for learning a neural network. The control unit (150) can perform calculations for learning a neural network, such as processing input data for learning in deep learning (DL), extracting features from input data, calculating errors, and updating the weights of the neural network using backpropagation. At least one of the CPU, GPGPU, and TPU of the processor (130) can process the learning of the network function. For example, the CPU and GPGPU can together process the learning of the network function and data classification using the network function. In addition, in an embodiment of the present invention, the control unit (150) of a plurality of computing devices can be used together to process the learning of the network function and data classification using the network function. In addition, the computer program executed in the computing device according to an embodiment of the present invention may be a CPU, GPGPU, or TPU executable program.

[0170] In addition, the membrane wastewater treatment system (100) of the present invention may further include an output unit and an input unit.

[0171] For example, the output section may include at least one of a liquid crystal display (LCD), a thin film transistor-liquid crystal display (TFT LCD), an organic light-emitting diode (OLED), a flexible display, and a 3D display. Some of these display modules may be configured to be transparent or light-transmitting so that the outside can be seen through them. This may be referred to as a transparent display module, and representative examples of transparent display modules include TOLED (Transparent OLED).

[0172] Additionally, the input unit may receive user input. The input unit may include keys and / or buttons on a user interface or physical keys and / or buttons for receiving user input. A computer program according to embodiments of the present disclosure may be executed in accordance with user input through the input unit.

[0173] In addition, the input unit may receive a signal by detecting the user's button operation or touch input, or receive the voice or movements of the user, etc., through a camera or microphone and convert them into an input signal. For this purpose, speech recognition technology or motion recognition technology may be used.

[0174] For example, the input unit can recognize user touch input. In some cases, the input unit may have the same configuration as the output unit. The input unit may be composed of a touch screen implemented to receive user selection input. The touch screen may use any one of the following methods: contact capacitive, infrared light detection, surface ultrasonic (SAW), piezoelectric, or resistive.

[0175] In this way, the present invention can efficiently treat and recycle wastewater with complex characteristics generated in a membrane manufacturing process by performing primary and secondary pretreatment and recycling treatment on the wastewater generated in the membrane manufacturing process.

[0176] In addition, the present invention can effectively process and recover colloidal ceramic particles, such as silica (SiO2) and alumina (Al2O3), enabling their recycling into high-value-added materials.

[0177] In addition, the present invention can effectively treat non-biodegradable organic substances and hazardous chemicals through complex treatment, and the treatment efficiency is improved, allowing for effective sludge treatment without outsourcing, thereby reducing costs.

[0178] In addition, the present invention reduces OPEX (operating costs) by implementing a zero-discharge system to minimize environmental burden and reducing water usage by recycling treated water as industrial water or cooling tower makeup water, and enables stable continuous operation through an automatic cleaning function and a process water discharge system.

[0179] In addition, the present invention can improve the working environment and prevent air pollution by removing volatile organic compounds (VOCs) and odors through a deodorizing device.

[0180] FIG. 8 is a diagram illustrating experimental result data of a membrane wastewater treatment system according to one embodiment of the present invention.

[0181] As shown in Fig. 8, the present invention measured the wastewater treatment performance by performing wastewater treatment based on raw wastewater (DC) generated during membrane manufacturing, calcium hydroxide Ca(OH)2, air degassing for about 7 hours, and reverse electrodialysis (EDR).

[0182] 0 min 5 min 10 min 11 min 15 min pH 12.4 11.4 2.5 9 2.3 2 2.0 1 TDS 27 40 56 110 87 9 21.9 Raw water measurement temperature 19.7 20.6 20.8 20.9 20.9

[0183] As shown in Table 1 above, it can be seen that the pH (hydrogen ion index) and TDS (total dissolved solids) of the wastewater gradually decrease over time. In other words, as shown in the experimental results of Figure 8, the present invention can efficiently treat and recycle wastewater with complex characteristics generated in the membrane manufacturing process by performing primary and secondary pretreatment and recycling treatments on the wastewater generated in the membrane manufacturing process.

[0184] FIG. 9 is a drawing showing a photograph of a recycled material analyzed according to the treatment results of a membrane wastewater treatment system according to one embodiment of the present invention.

[0185] As shown in FIG. 9, the membrane wastewater treatment system of the present invention can effectively treat and recover colloidal ceramic particles such as silica (SiO2), alumina (Al2O3), and sodium sulfate, and can be recycled into high-value-added materials.

[0186] Here, alumina particles can be recovered as a result of treating raw wastewater (DC) generated during the manufacture of separators, and sodium sulfate particles can be effectively recovered as a result of treating raw concentrated salt wastewater generated during the manufacture of secondary batteries.

[0187] As such, the present invention enables the recovery of high-value materials from wastewater, making recycling possible, and allows for the effective treatment of non-biodegradable organic substances and hazardous chemicals through complex treatment. Furthermore, the improved treatment efficiency enables effective sludge treatment without outsourcing, thereby reducing costs.

[0188] In addition, the present invention reduces OPEX (operating costs) by implementing a zero-discharge system to minimize environmental burden and reducing water usage by recycling treated water as industrial water or cooling tower makeup water, and enables stable continuous operation through an automatic cleaning function and a process water discharge system.

[0189] In addition, the present invention can improve the working environment and prevent air pollution by removing volatile organic compounds (VOCs) and odors through a deodorizing device.

[0190] Although embodiments of the present invention have been described above with reference to the attached drawings, those skilled in the art will understand that the present invention may be implemented in other specific forms without altering its technical concept or essential features. Therefore, the embodiments described above should be understood as illustrative in all respects and not restrictive.

[0191] The present invention can be used in a wastewater treatment system that treats wastewater generated in a membrane manufacturing process.

Claims

A collection tank for collecting and storing wastewater generated during the membrane manufacturing process; A first pretreatment unit for primary pretreatment of wastewater stored in the above-mentioned collection tank; A second pretreatment unit that performs a second pretreatment of the above-mentioned first-stage pretreated wastewater using a treatment method different from that of the first treatment unit; A recycling treatment unit that recycles the above secondary pretreated wastewater; and, It includes a control unit that controls the first and second pretreatment units and the recycling treatment unit, and The above first preprocessing unit is, It includes an oxidation and reduction reaction treatment unit that pretreats the wastewater using a first treatment method utilizing an oxidizing agent and a reducing agent, a plasma treatment unit that pretreats the wastewater using a second treatment method utilizing plasma, and an ultrasonic treatment unit that pretreats the wastewater using a third treatment method utilizing ultrasound. The above control unit is, A membrane wastewater treatment system characterized by determining at least one of the first, second, and third treatment methods based on the characteristics of the wastewater, and controlling at least one of the oxidation and reduction reaction treatment unit, the plasma treatment unit, and the ultrasonic treatment unit to pre-treat the wastewater using the determined treatment method. In Article 1, The above oxidation and reduction reaction treatment unit is, A membrane wastewater treatment system characterized by decomposing at least a portion of organic matter contained in the wastewater and removing at least a portion of salt contained in the wastewater by gasifying it through oxidation and reduction reactions utilizing the oxidizing agent and the reducing agent according to the control signal of the control unit. In Article 1, The above plasma treatment unit is, A membrane wastewater treatment system characterized by decomposing at least a portion of organic matter contained in the wastewater through active species including electrons, ions, and radicals generated in the plasma according to a control signal of the control unit, ultraviolet rays, and shock waves. In Article 1, The above ultrasonic processing unit is, A membrane wastewater treatment system characterized by decomposing at least a portion of organic matter and colloids contained in the wastewater through ultrasonic irradiation according to a control signal of the control unit. In Article 1, The above first preprocessing unit is, A membrane wastewater treatment system characterized by further including a solid treatment unit that performs at least one of a chemical treatment method for removing solids by coagulating impurities through chemical treatment of wastewater stored in the collection tank and a mechanical treatment method for removing solids by filtering impurities through mechanical treatment of wastewater stored in the collection tank. In Article 5, The solid treatment unit of the first pretreatment unit above is, A membrane wastewater treatment system characterized by including a CC (Chemical Coagulation) device that performs the above chemical treatment method and an APF (Automatic Pressure Filter) device that performs the above mechanical treatment method. In Article 5, The above control unit is, A membrane wastewater treatment system characterized by determining at least one of the chemical treatment method and the mechanical treatment method based on the characteristics of the wastewater, and controlling the solid treatment unit to remove solids from the wastewater using the determined treatment method. In Article 1, The above second preprocessing unit is, A membrane filtration treatment unit that performs secondary pretreatment of the primary pretreated wastewater using a fourth treatment method utilizing an ultrafine filtration membrane; and, A membrane wastewater treatment system characterized by including a buffer tank that temporarily stores the secondary pretreated wastewater and supplies it to the recycling treatment unit at a constant flow rate. In Article 8, The above membrane filtration treatment unit is, A membrane wastewater treatment system characterized by performing secondary pretreatment of the wastewater using a membrane filtration method that removes organic matter, colloids, and solids contained in the primary pretreated wastewater using the ultrafine filtration membrane according to a control signal of the control unit. In Article 8, The above membrane filtration treatment unit is, A membrane wastewater treatment system characterized by being connected to the return water inlet pipe of the above-mentioned collection tank and returning a portion of the above-mentioned secondary pretreated wastewater to the above-mentioned collection tank through the return water inlet pipe. In Article 1, The above recycling processing unit is, A reverse electrodialysis unit for separating and removing salts contained in the above wastewater into cations and anions; and, A membrane wastewater treatment system characterized by including a deodorizing unit that removes odor components of contaminated air generated from the above wastewater. In Article 11, The above-mentioned reverse electrodialysis unit is, A membrane wastewater treatment system characterized by separating and removing salts contained in the secondary pretreated wastewater into cations and anions according to a control signal of the control unit, and removing scale and contamination generated on the cation exchange membrane and anion exchange membrane by reversing the polarity of the electrodes at regular intervals to perform recycling treatment of the wastewater. In Article 11, The above-mentioned reverse electrodialysis unit is, A membrane wastewater treatment system characterized by being connected to the return water inlet pipe of the above-mentioned collection tank and returning a portion of the recycled treated wastewater to the above-mentioned collection tank through the return water inlet pipe. In Article 1, The above control unit is, A membrane wastewater treatment system characterized by receiving a wastewater treatment request through a user terminal or an external server, analyzing the characteristics of the wastewater stored in the collection tank, determining at least one of the first, second, and third treatment methods based on the results of the analyzed wastewater characteristics, controlling the first pretreatment unit to pretreat the wastewater using the determined first pretreatment method, controlling the second pretreatment unit to pretreat the wastewater when the wastewater pretreated in the first method is moved to the second pretreatment unit, and controlling the recycling unit to recycle the wastewater when the wastewater pretreated in the second method is moved to the recycling treatment unit. In a membrane wastewater treatment method of a membrane wastewater treatment system, A step of collecting and storing wastewater generated in the membrane manufacturing process; A step of primary pre-treating the above-mentioned stored wastewater; A step of secondarily pretreating the above-mentioned first-stage pretreated wastewater; and It includes the step of recycling the above-mentioned secondary pretreated wastewater, and The above first preprocessing step is, A membrane wastewater treatment method characterized by determining at least one of a first treatment method using an oxidizing agent and a reducing agent, a second treatment method using plasma, and a third treatment method using ultrasound based on the characteristics of the wastewater, and performing a first pretreatment of the wastewater using the determined treatment method.

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