System for treatment of ro concentrate by electrosorption

Abstract

The application provides a system for treating RO concentrated water by using electro-sorption, which comprises a pretreatment unit, an RO treatment unit and an electro-sorption treatment unit; the electro-sorption treatment unit has a power module and a booster with an anode and a cathode; in the working stage, the water to be treated enters the RO treatment unit for desalination, at this time, the TDS (total dissolved solid amount) of the RO reverse osmosis concentrated water is in the range of about 5000-20000; the water after desalination enters the electro-sorption treatment unit, and deep physical salt separation is carried out in the electro-sorption treatment unit, the salt is adsorbed on the surface of the cathode, so that most of the salt in the RO concentrated water is removed. In the regeneration stage, too much salt adsorbed on the surface of the cathode will cause the voltage to rise, at this time, pulse voltage coupling ultrasonic regeneration is carried out, the salt adsorbed on the surface of the cathode is loosened and removed, and then discharged outside the system, so that the whole RO concentrated water desalination process is completed.

Description

Technical Field

[0001] This application relates to the field of water treatment technology, and in particular to a system for treating RO concentrate using electroadsorption. Background Technology

[0002] The concentrate produced by the RO system accounts for 20-40% of the influent and has a high salt content. High hardness The concentrate produced by the RO system is typically treated in the following ways: (1) Evaporation crystallization method, which has high energy consumption ( (2) Membrane concentration method, which is prone to scaling and fouling; (3) Activated carbon electrode adsorption method, which has a calcium and magnesium removal rate of only 45%; (4) Multi-stage series CDI system has excessively high energy consumption. ).

[0003] Therefore, there is an urgent need for a system that uses electroadsorption to treat RO concentrate, in order to solve the technical problems existing in the current technology to a certain extent. Utility Model Content

[0004] The purpose of this application is to provide a system for treating RO concentrate using electroadsorption, which reduces system energy consumption to a certain extent and improves the salt removal rate in the concentrate.

[0005] This application provides a system for treating RO concentrate using electroadsorption, comprising: The pretreatment unit stores the water to be treated. The RO treatment unit includes a conveying section, a reverse osmosis membrane, and a storage section. The conveying section can convey the water to be treated in the pretreatment unit to the reverse osmosis membrane. The reverse osmosis membrane is used to perform primary treatment on the conveyed water and can guide the qualified water to the storage section. An electro-adsorption treatment unit is provided, with its input end connected to the output end of the reverse osmosis membrane. Substandard water treated by the reverse osmosis membrane can be guided to the electro-adsorption treatment unit, which can perform secondary treatment on the substandard water. The electro-adsorption treatment unit has a power supply module and an enhancer with an anode and a cathode. During the working phase, when the power supply module supplies a first preset DC voltage to the enhancer, impurities in the substandard water can be adsorbed onto the cathode. During the regeneration phase, when the power supply module supplies a second preset pulse voltage to the enhancer, the impurities adsorbed onto the cathode can be removed.

[0006] In the above technical solution, the enhancer further includes: The shell has a cylindrical structure and surrounds a flow guiding cavity; the shell has an input port that communicates with the output end of the reverse osmosis membrane; A conductive rod is disposed in the flow guiding cavity; the conductive rod extends along the axial direction of the housing, and its two ends along the axial direction respectively abut against the upper end and the lower end of the housing; A flow guide plate is wound in a spiral shape around the conductive rod.

[0007] In the above technical solution, further, during the working phase, the first preset DC voltage is set between 1.0V and 1.4V; The negative terminal of the power supply module is electrically connected to the housing, so that the housing serves as the cathode; The positive terminal of the power supply module is electrically connected to the conductive rod formed on the housing.

[0008] In the above technical solution, further, during the regeneration stage: the second preset pulse voltage is set between 0.8V and 1.0V; The positive terminal of the power supply module is electrically connected to the housing; the negative terminal of the power supply module is electrically connected to the conductive rod formed on the housing.

[0009] In the above technical solution, the conductive rod is further made of graphene aerogel with a specific surface area greater than or equal to 1200. Its aperture is set between 2nm and 5nm.

[0010] In the above technical solution, the inner wall of the shell is further provided with an activated carbon fiber layer containing Ag nanoparticles. The particle size of the Ag nanoparticles is set between 20 nm and 50 nm.

[0011] In the above technical solution, the guide plate is further divided into a first guide section, a second guide section and a third guide section at equal intervals along the axial direction of the housing; The cross-sectional area of ​​the guide vane in the first guide section is set between 4mm and 6mm; The cross-sectional area of ​​the guide vane in the second guide section is set between 2mm and 4mm; The cross-sectional area of ​​the guide plate in the third guide section is set between 7mm and 9mm.

[0012] In the above technical solution, the system for treating RO concentrate using electroadsorption further includes a reflux unit; The reflux unit includes a reflux pipe, and the housing has an output port; One end of the return pipe is connected to the output hole of the housing and the other end is connected to the pretreatment unit; The return pipe can guide the qualified water, which is formed by the secondary treatment of the substandard water by the electro-adsorption treatment unit, to the pretreatment unit.

[0013] In the above technical solution, the reflux unit further includes a discharge pipe; The two ends of the discharge pipe are connected to the housing and the floor drain, respectively, and the substandard water formed after the substandard water is treated by the electro-adsorption treatment unit is discharged through the floor drain.

[0014] In the above technical solution, the reflux unit further includes an exhaust pipe; the two ends of the exhaust pipe are respectively connected to the pretreatment unit and the housing, which can guide the gas generated in the housing to the pretreatment unit.

[0015] Compared with the prior art, this application has the following beneficial effects: This application provides a system for treating RO concentrate using electroadsorption, comprising: The pretreatment unit stores the water to be treated. The RO treatment unit includes a conveying section, a reverse osmosis membrane, and a storage section. The conveying section can convey the water to be treated in the pretreatment unit to the reverse osmosis membrane. The reverse osmosis membrane is used to perform primary treatment on the conveyed water and can guide the qualified water to the storage section. An electro-adsorption treatment unit is provided, with its input end connected to the output end of the reverse osmosis membrane. Substandard water treated by the reverse osmosis membrane can be guided to the electro-adsorption treatment unit, which can perform secondary treatment on the substandard water. The electro-adsorption treatment unit has a power supply module and an enhancer with an anode and a cathode. During the working phase, when the power supply module supplies a first preset DC voltage to the enhancer, impurities in the substandard water can be adsorbed onto the cathode. During the regeneration phase, when the power supply module supplies a second preset pulse voltage to the enhancer, the impurities adsorbed onto the cathode can be removed.

[0016] In summary, during the operational phase, the water to be treated enters the RO treatment unit for desalination. At this time, the TDS (Total Dissolved Solids) of the RO concentrate is approximately 5000-20000. Within this range, the desalinated permeate enters the electro-adsorption treatment unit, where deep physical salt separation is performed. The salt is adsorbed onto the cathode surface, thereby removing most of the salt from the RO concentrate.

[0017] During the regeneration phase, excessive salt adsorbed on the cathode surface can cause the voltage to rise. At this point, pulsed voltage-coupled ultrasonic regeneration is performed to loosen and remove the salt adsorbed on the cathode surface and discharge it outside the system, thus completing the entire RO concentrate desalination process. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0019] Figure 1 The flowchart of the system for treating RO concentrate using electroadsorption provided by this application; Figure 2 A schematic diagram of the enhancer in the system for treating RO concentrate using electroadsorption provided by this application; Figure 3 A schematic diagram of the planar structure of the enhancer in the system for treating RO concentrate using electroadsorption provided by this application; Figure 4 for Figure 3 Sectional view of AA; Figure 5 for Figure 3 BB section view; Figure 6 for Figure 2 A bottom view; Figure 7 for Figure 2 Top view.

[0020] Reference numerals: 1-Pretreatment unit; 101-Water tank; 2-RO treatment unit; 201-Transfer section; 202-Reverse osmosis membrane; 203-Storage section; 204-Water pump; 205-Water tank; 3-Electroadsorption treatment unit; 301-Enhancer; 302-Housing; 303-Flow guiding cavity; 304-Input port; 305-Conductive rod; 306-Flow guiding plate; 307-Output port; 308-Electrode plate; 4-Return unit; 401-Return pipe; 402-Discharge pipe; 403-Exhaust pipe; 404-Floor drain. Detailed Implementation

[0021] The following detailed embodiments are provided to aid the reader in gaining a comprehensive understanding of the methods, apparatus, and / or systems described herein. However, various changes, modifications, and equivalents of the methods, apparatus, and / or systems described herein will be apparent upon understanding the disclosure of this application. For example, the order of operations described herein is merely illustrative and is not limited to the order presented herein; rather, changes that will be apparent upon understanding the disclosure of this application are possible, except for operations that must occur in a specific order. Furthermore, descriptions of features known in the art may be omitted for clarity and brevity. The features described herein may be implemented in different forms and should not be construed as limited to the examples described herein. Rather, the examples described herein are provided only to illustrate some of the many possible ways of implementing the methods, apparatus, and / or systems described herein that will be apparent upon understanding the disclosure of this application. Throughout this specification, when an element (such as a layer, region, or substrate) is described as being "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, it may be directly "on" another element, "connected to" another element, "bonded to" another element, "on" another element, or "covering" another element, or there may be one or more other elements in between. Conversely, when an element is described as being "directly on" another element, "directly connected to" another element, "directly bonded to" another element, "directly on" another element, or "directly covering" another element, there may be no other elements in between. As used herein, the term "and / or" includes any one of the relevant items listed and any combination of any two or more of them. Although terms such as "first," "second," and "third" may be used herein to describe individual components, members, regions, layers, or portions, these components, members, regions, layers, or portions are not limited by these terms. More precisely, these terms are used only to distinguish one component, element, region, layer, or part from another. Therefore, without departing from the teachings of the examples described herein, the first component, element, region, layer, or part referred to as such in the examples may also be referred to as the second component, element, region, layer, or part. For ease of description, spatial relational terms such as “above,” “upper,” “below,” and “lower” may be used herein to describe the relationship between one element and another, as shown in the accompanying drawings. Such spatial relational terms are intended to include not only the orientation depicted in the drawings but also the different orientations of the device in use or operation. For example, if the device in the drawings is flipped, an element described as being “above” or “upper” relative to another element will subsequently be “below” or “lower” relative to that other element.Therefore, the term "above" includes both "above" and "below" depending on the spatial orientation of the device. The device may also be positioned in other ways (e.g., oscillating 90 degrees or in other orientations), and the spatial relational terms used herein will be interpreted accordingly. The terminology used herein is for describing various examples only and is not intended to limit this disclosure. Unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. The terms "comprising," "including," and "having" enumerate the stated features, quantities, operations, components, elements, and / or combinations thereof, but do not exclude the presence or addition of one or more other features, quantities, operations, components, elements, and / or combinations thereof. Variations in the shapes shown in the figures may occur due to manufacturing techniques and / or tolerances. Therefore, the examples described herein are not limited to the specific shapes shown in the figures but include changes in shape that occur during manufacturing. The features of the examples described herein may be combined in various ways that will be apparent upon understanding the disclosure of this application. Furthermore, although the examples described herein have a wide variety of constructions, other constructions are possible as will be apparent upon understanding the disclosure of this application.

[0022] The existing methods for treating the concentrate generated by RO systems are as follows: (1) Evaporation crystallization, which has high energy consumption ( (2) Membrane concentration method, which is prone to scaling and fouling; (3) Activated carbon electrode adsorption method, which has a calcium and magnesium removal rate of only 45%; (4) Multi-stage series CDI system has excessively high energy consumption. To address the shortcomings of existing methods, this application provides a system for treating RO concentrate using electroadsorption, which is described below. Figures 1-7 The application is described in detail.

[0023] Combination Figure 1 As shown, the system for treating RO concentrate using electroadsorption includes a pretreatment unit 1, which contains multiple water tanks 101, each storing water to be treated. Note: The water tanks 101 are large enough and numerous enough to store a sufficient amount of water to be treated.

[0024] Still combined Figure 1 As shown, the system for treating RO concentrate using electroadsorption also includes an RO treatment unit 2. The RO treatment unit 2 has a conveying section 201, a reverse osmosis membrane 202, and a storage section 203. The conveying section 201 can convey the water to be treated in the pretreatment unit 1 to the reverse osmosis membrane 202. Optionally, the conveying section 201 is a water pump 204, that is, the water to be treated in the water tank 101 is extracted to the reverse osmosis membrane 202 by the water pump 204.

[0025] In this process, the water to be treated passes through the reverse osmosis membrane 202, where it retains dissolved salts, colloids, microorganisms, and other impurities, thus achieving primary treatment of the water. The treated water that meets the standards is then guided to the storage section 203, which is a water tank 205.

[0026] Still combined Figure 1 As shown, the system for treating RO concentrate using electro-adsorption also includes an electro-adsorption treatment unit 3. The input end of the electro-adsorption treatment unit 3 is connected to the output end of the reverse osmosis membrane 202. The substandard water after being treated by the reverse osmosis membrane 202 can be guided to the electro-adsorption treatment unit 3. The electro-adsorption treatment unit 3 can perform secondary treatment on the substandard water and remove the salt from the substandard water.

[0027] Specifically, the electro-adsorption treatment unit 3 has a power supply module and an enhancer 301 with an anode and a cathode. During the operation phase: when the power supply module supplies a first preset DC voltage to the enhancer 301, impurities in the substandard water can be adsorbed onto the cathode; during the regeneration phase: when the power supply module supplies a second preset pulse voltage to the enhancer 301, the impurities adsorbed onto the cathode can be removed.

[0028] Furthermore, in combination Figure 4 As shown, the enhancer 301 includes a housing 302, which has a cylindrical structure and can be a cylindrical tube, and is surrounded by a flow guiding cavity 303. The housing 302 has an input hole 304 that communicates with the output end of the reverse osmosis membrane 202. The substandard water discharged from the reverse osmosis membrane 202 can be guided into the housing 302 through the input hole 304.

[0029] Furthermore, it still combines Figure 4 As shown, the enhancer 301 also includes a conductive rod 305, which is disposed in the flow guiding cavity 303. The conductive rod 305 extends along the axial direction of the housing 302, and its two ends along the axial direction respectively abut against the upper end and the lower end of the housing 302.

[0030] Furthermore, in combination Figure 4 and Figure 5 As shown, the enhancer 301 also includes a guide plate 306, which is spirally wound around the conductive rod 305.

[0031] In this embodiment, during the working phase, the first preset DC voltage is set between 1.0V and 1.4V, preferably 1.2V. The negative terminal of the power supply module is electrically connected to the housing 302, so that the housing 302 serves as the cathode; the positive terminal of the power supply module is electrically connected to the conductive rod 305 formed on the housing 302 (in the actual connection process, an electrode 308 is provided at the position of the conductive rod on the housing).

[0032] During the working phase, the water to be treated enters RO treatment unit 2 for desalination. At this time, the TDS (Total Dissolved Solids) of the RO reverse osmosis concentrate is approximately 5000-20000. Within this range, the desalinated permeate enters the electro-adsorption treatment unit 3, where deep physical salt separation is performed. The salt is adsorbed onto the cathode surface, thereby removing most of the salt from the RO concentrate.

[0033] In this embodiment, during the regeneration phase: the second preset pulse voltage is set between 0.8V and 1.0V, preferably 0.8V. The positive terminal of the power supply module is electrically connected to the housing 302; the negative terminal of the power supply module is electrically connected to the conductive rod 305 formed on the housing 302.

[0034] During the regeneration phase, excessive salt adsorbed on the cathode surface can cause a voltage increase. At this point, pulsed voltage-coupled ultrasonic regeneration is performed to loosen and remove the salt adsorbed on the cathode surface before it is discharged outside the system, thus completing the entire RO concentrate desalination process.

[0035] In summary, the above-mentioned structure increases regeneration efficiency to 92%, extends electrode life by 3 times, increases processing speed by 40%, and reduces energy consumption by 18%; it also improves... Adsorption capacity.

[0036] Optionally, the conductive rod 305 is made of graphene aerogel with a specific surface area greater than or equal to 1200. Its aperture is set between 2nm and 5nm.

[0037] Optionally, the inner wall of the shell 302 is attached with an activated carbon fiber layer containing Ag nanoparticles; the particle size of the Ag nanoparticles is set between 20 nm and 50 nm.

[0038] The aforementioned guide vanes 306 are equally divided into a first guide section, a second guide section, and a third guide section along the axial direction of the housing 302. The cross-sectional area of ​​the guide vanes 306 in the first guide section is between 4mm and 6mm; the cross-sectional area of ​​the guide vanes 306 in the second guide section is between 2mm and 4mm; and the cross-sectional area of ​​the guide vanes 306 in the third guide section is between 7mm and 9mm.

[0039] In this embodiment, combined with Figure 1As shown, the system for treating RO concentrate using electro-adsorption also includes a reflux unit 4; the reflux unit 4 includes a reflux pipe 401, and the housing 302 has an output hole 307; one end of the reflux pipe 401 is connected to the output hole 307 of the housing 302 and the other end is connected to the pretreatment unit 1; the reflux pipe 401 can guide the qualified water formed after the electro-adsorption treatment unit 3 performs secondary treatment on the substandard water to the pretreatment unit 1.

[0040] In addition, the reflux unit 4 also includes a discharge pipe 402, the two ends of which are connected to the housing 302 and the floor drain 404 respectively, so that the substandard water formed after the substandard water is treated by the electro-adsorption treatment unit 3 can be discharged through the floor drain 404.

[0041] In addition, the reflux unit 4 also includes an exhaust pipe 403, the two ends of which are connected to the pretreatment unit 1 and the housing 302 respectively, and can guide the gas generated in the housing 302 to the pretreatment unit 1.

[0042] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit them. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of the embodiments of this application.

Claims

1. A system for treating RO concentrate using electroadsorption, characterized in that, include: The pretreatment unit stores the water to be treated. The RO treatment unit includes a conveying section, a reverse osmosis membrane, and a storage section. The conveying section can convey the water to be treated in the pretreatment unit to the reverse osmosis membrane. The reverse osmosis membrane is used to perform primary treatment on the conveyed water and can guide the qualified water to the storage section. An electro-adsorption treatment unit is provided, with its input end connected to the output end of the reverse osmosis membrane. Substandard water treated by the reverse osmosis membrane can be guided to the electro-adsorption treatment unit, which can perform secondary treatment on the substandard water. The electro-adsorption treatment unit has a power supply module and an enhancer with an anode and a cathode. During the working phase, when the power supply module supplies a first preset DC voltage to the enhancer, impurities in the substandard water can be adsorbed onto the cathode. During the regeneration phase, when the power supply module supplies a second preset pulse voltage to the enhancer, the impurities adsorbed onto the cathode can be removed.

2. The system for treating RO concentrate using electroadsorption according to claim 1, characterized in that, The enhancer includes: The shell has a cylindrical structure and surrounds a flow guiding cavity; the shell has an input port that communicates with the output end of the reverse osmosis membrane; A conductive rod is disposed in the flow guiding cavity; the conductive rod extends along the axial direction of the housing, and its two ends along the axial direction respectively abut against the upper end and the lower end of the housing; A flow guide plate is wound in a spiral shape around the conductive rod.

3. The system for treating RO concentrate using electroadsorption according to claim 2, characterized in that, During the working phase, the first preset DC voltage is set between 1.0V and 1.4V; The negative terminal of the power supply module is electrically connected to the housing, so that the housing serves as the cathode; The positive terminal of the power supply module is electrically connected to the conductive rod formed on the housing.

4. The system for treating RO concentrate using electroadsorption according to claim 3, characterized in that, During the regeneration phase: the second preset pulse voltage is set between 0.8V and 1.0V; The positive terminal of the power supply module is electrically connected to the housing; the negative terminal of the power supply module is electrically connected to the conductive rod formed on the housing.

5. The system for treating RO concentrate using electroadsorption according to claim 3 or 4, characterized in that, The conductive rod is made of graphene aerogel with a specific surface area greater than or equal to 1200. Its aperture is set between 2nm and 5nm.

6. The system for treating RO concentrate using electroadsorption according to claim 3 or 4, characterized in that, The inner wall of the shell is attached with an activated carbon fiber layer containing Ag nanoparticles. The particle size of the Ag nanoparticles is set between 20 nm and 50 nm.

7. The system for treating RO concentrate using electroadsorption according to claim 2, characterized in that, The guide vane is divided into a first guide section, a second guide section, and a third guide section at equal intervals along the axial direction of the housing; The cross-sectional area of ​​the guide vane in the first guide section is set between 4mm and 6mm; The cross-sectional area of ​​the guide vane in the second guide section is set between 2mm and 4mm; The cross-sectional area of ​​the guide plate in the third guide section is set between 7mm and 9mm.

8. The system for treating RO concentrate using electroadsorption according to claim 2, characterized in that, The system for treating RO concentrate using electroadsorption also includes a reflux unit; The reflux unit includes a reflux pipe, and the housing has an output port; One end of the return pipe is connected to the output hole of the housing and the other end is connected to the pretreatment unit; The return pipe can guide the qualified water, which is formed by the secondary treatment of the substandard water by the electro-adsorption treatment unit, to the pretreatment unit.

9. The system for treating RO concentrate using electroadsorption according to claim 8, characterized in that, The reflux unit also includes a discharge pipe; The two ends of the discharge pipe are connected to the housing and the floor drain, respectively, and the substandard water formed after the substandard water is treated by the electro-adsorption treatment unit is discharged through the floor drain.

10. The system for treating RO concentrate using electroadsorption according to claim 8, characterized in that, The recirculation unit also includes an exhaust pipe; The two ends of the exhaust pipe are respectively connected to the pretreatment unit and the housing, which can guide the gas generated in the housing to the pretreatment unit.

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