CN118387997A - Electrosorption device for separating total dissolved solids in wastewater and wastewater treatment system - Google Patents

Abstract

The invention discloses an electric adsorption device and a wastewater treatment system for separating total dissolved solids in wastewater, relates to the technical field of wastewater treatment, and solves the problem that the electric adsorption device in the related art cannot separate various salts in the wastewater. The electric adsorption unit of the electric adsorption device at least comprises a first electric adsorption component, a pretreatment component and a second electric adsorption component, wherein the pretreatment component is used for separating charged cations from charged anions in first treated water, the polarity of a third external electric component of the pretreatment component is opposite to that of the first external electric component of the electric adsorption device for separating total dissolved solids in wastewater, and meanwhile, the polarity of the third external electric component is opposite to that of a second external electric component of the electric adsorption device for separating total dissolved solids in wastewater. The electric adsorption device not only can separate various salts in raw water, but also can reduce the use cost of the electric adsorption device for separating the total dissolved solids in wastewater.

Description

Electrosorption device for separating total dissolved solids in wastewater and wastewater treatment system

Technical Field

The invention relates to the technical field of wastewater treatment, and in particular to an electric adsorption device for separating total soluble solids in wastewater and a wastewater treatment system.

Background technique

Total dissolved solids (TDS) in wastewater indicates the dissolved solids content in wastewater. The higher the TDS value, the more dissolved solids are contained in the wastewater.

Wastewater treatment is the process of purifying wastewater so that it meets the water quality requirements for discharge into a water body or reuse. Wastewater treatment is widely used in various fields such as construction, agriculture, transportation, energy, petrochemicals, environmental protection, urban landscape, medical care, and catering.

Electro-Sorption Technology (EST), also known as capacitive deionization technology or capacitive deionization technology (CDI), has been gradually applied in wastewater treatment and other fields due to its high efficiency, low energy consumption and simple process. Electro-sorption technology can use the effect of electric field to separate and concentrate dissolved substances in wastewater, thereby achieving the purpose of wastewater purification and dissolved substance reuse.

The principle of electrosorption technology is: when raw water flows in the space formed by the cathode and anode, under the action of the electric field force, the charged particles in the water (ions, colloid particles, organic matter and bacteria, etc.) will migrate to the electrodes with opposite charges respectively, and be adsorbed by the electrodes and stored in the double electric layer, so as to separate the charged particles (impurities) from the water, and the desalted water flows out from the other end. When the electrode loses power or is reversed instantly, the charged particles enriched on the electrode will fall off from the electrode and be washed away under the action of the water flow or electric field force, and the electrode will be regenerated.

However, wastewater usually has a complex composition and contains a variety of salts. Using traditional electrosorption devices for wastewater treatment can usually only separate the salt from the water in the wastewater, but cannot separate different types of salts.

Summary of the invention

The invention discloses an electric adsorption device and a wastewater treatment system for separating soluble total solids in wastewater, so as to solve the technical problem that the electric adsorption device in the related art cannot separate various salts in wastewater.

In order to solve the above problems, the present invention adopts the following technical solutions:

A first aspect of the present invention provides an electrosorption device for separating total dissolved solids in wastewater.

The present invention provides an electrosorption device for separating total soluble solids in wastewater, comprising a plurality of electrosorption units, wherein the electrosorption unit comprises at least a first electrosorption component, a pretreatment component and a second electrosorption component, wherein the water inlet of the first electrosorption component is connected to the water outlet of raw water, the first electrosorption component is used to separate raw water into a first salt concentrate and a first treated water, the water outlet of the first electrosorption component is connected to the water inlet of the pretreatment component, the pretreatment component is used to separate charged cations from charged anions in the first treated water, the water outlet of the pretreatment component is connected to the water inlet of the second electrosorption component, and the water outlet of the pretreatment component is connected to the water outlet of the second electrosorption component. The water inlet is connected, and the charged cations and charged anions in the first treated water enter the water production channel and the concentration channel of the second electrosorption component respectively. The second electrosorption component is used to separate the first treated water into a second salt concentrate and a second treated water. The first electrosorption component also has a first external voltage component, the second electrosorption component also has a second external voltage component, and the pretreatment component also has a third external voltage component. The polarity of the third external voltage component is opposite to that of the first external voltage component, and the polarity of the third external voltage component is also opposite to that of the second external voltage component.

A second aspect of the present invention provides a wastewater treatment system.

The wastewater treatment system of the present invention comprises the electric adsorption device for separating the total soluble solids in wastewater as described in any one of the technical solutions of the present invention.

The technical solution adopted by the present invention can achieve the following beneficial effects:

The electric adsorption device for separating total soluble solids in wastewater of the present invention comprises a plurality of electric adsorption units, each of which comprises at least a first electric adsorption component and a second electric adsorption component. When there are two kinds of salts in the raw water, the first salt in the raw water can be separated by the action of the first electric adsorption component, and then the first treated water treated by the first electric adsorption component enters the second electric adsorption component, and the second salt in the raw water can be separated by the action of the second electric adsorption component, thereby obtaining treated produced water, and realizing the separation of water, the first salt and the second salt in the raw water. It can be seen that the electric adsorption device for separating total soluble solids in wastewater of the present invention can solve the technical problem that the electric adsorption device in the related art cannot separate multiple salts in the wastewater.

Furthermore, in the electrosorption device for separating soluble total solids in wastewater of the present invention, a pretreatment component is provided between the first electrosorption component and the second electrosorption component. The pretreatment component can separate the charged cations and the charged anions in the first treated water, and most of the separated charged cations enter the water production channel of the second electrosorption component, and most of the separated charged anions enter the concentration channel of the second electrosorption component. Therefore, during the treatment of the first treated water by the second electrosorption component, under the action of the second external voltage element, the charged cations in the water production channel only need to pass through one layer of cation selective exchange membrane to reach the concentration channel, and since most of the charged anions are distributed to the concentration channel, only a small amount of charged anions need to pass through two layers of anion selective exchange membranes. This method can reduce the replacement frequency of the anion selective exchange membrane in the second electrosorption component, which is beneficial to reducing the use cost of the electrosorption device for separating soluble total solids in wastewater.

BRIEF DESCRIPTION OF THE DRAWINGS

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

FIG1 is a schematic diagram showing the principle of implementing salt separation by an electrosorption unit according to an embodiment of the present application;

FIG2 is a schematic diagram of the structure of an electric adsorption device for separating total soluble solids in wastewater according to an embodiment of the present application;

FIG3 is a schematic structural diagram of an electric adsorption device for separating total soluble solids in wastewater according to another embodiment of the present application;

FIG4 is a schematic diagram of the structure of an electrosorption unit according to an embodiment of the present application;

FIG5 is a cross-sectional view of an electrosorption unit according to an embodiment of the present application;

FIG6 is an enlarged view of portion A in FIG5 ;

FIG7 is an enlarged view of portion B in FIG5 ;

FIG8 is an enlarged view of portion C in FIG5 ;

FIG9 is an exploded view of an electrosorption unit according to an embodiment of the present application;

FIG10 is a schematic diagram of a first electrode plate according to an embodiment of the present application;

FIG11 is an enlarged view of portion D in FIG10 ;

FIG12 is a schematic diagram of a first current equalizing plate according to an embodiment of the present application;

FIG13 is a schematic diagram of a second electrode plate according to an embodiment of the present application;

FIG. 14 is a structural block diagram of a wastewater treatment system according to an embodiment of the present application.

In the figure: 10, an electric adsorption device for separating soluble total solids in wastewater; 11, a supporting frame; 11a, a baffle; 12, a hydraulic mechanism; 13, a pressure plate; 14, a guard plate; 15, a first connecting rod; 16, a fastening plate; 17, a second connecting rod; 18, a bolt; 20, a wastewater collection tank; 30, a first filter; 40, a raw water tank; 50, a second filter; 60, a water production tank; 70, a concentrated water tank; 71, a first concentrated water tank; 72, a second concentrated water tank; 100, an electric adsorption unit; 110, a first electric adsorption component; 111, a first external voltage device; 112, a first electrode chamber; 1121, a first outlet; 1122, a first inlet; 113, a second electrode chamber; 1131, a second outlet; 1132, a second inlet; 114, a first fluid channel; 115, a second fluid channel; 116, a first anion selective exchange membrane; 117, a first cation selective exchange membrane; 120, pretreatment component; 121, third external voltage device; 122, pretreatment chamber; 123, third anion selective exchange membrane; 124, third cation selective exchange membrane; 130, second electrosorption component; 131, second external voltage device; 132, third electrode chamber; 1321, third outlet; 1322, third inlet; 133, fourth electrode chamber; 1331, fourth outlet; 1332, fourth inlet; 134, third fluid channel; 135, fourth fluid channel; 136, second anion selective exchange membrane; 137, second cation selective exchange membrane; 140, flow guide; 141, water-facing surface; 150, first electrode plate; 160, second electrode plate; 170, first flow equalizing plate; 180, second flow equalizing plate; 190, flow equalizing structure; 191, first flow equalizing structure; 192, second flow equalizing structure; 1921, baffle.

Detailed ways

To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

The terms "first", "second", etc. in the specification and claims of this application are used to distinguish similar objects, and are not used to describe a specific order or sequence. It should be understood that the data used in this way can be interchangeable under appropriate circumstances, so that the embodiments of the present application can be implemented in an order other than those illustrated or described here, and the objects distinguished by "first", "second", etc. are generally of one type, and the number of objects is not limited. For example, the first object can be one or more. In addition, "and/or" in the specification and claims represents at least one of the connected objects, and the character "/" generally indicates that the objects associated with each other are in an "or" relationship.

In conjunction with Figures 1 to 14 , the electric adsorption device and wastewater treatment system for separating total soluble solids in wastewater provided in the embodiments of the present application are described in detail through specific embodiments and their application scenarios.

The first aspect of this embodiment provides a detailed description of the electric adsorption device of the present invention for separating total soluble solids in wastewater.

The electric adsorption device for separating total dissolved solids in wastewater in this embodiment includes a plurality of electric adsorption units 100, as shown in FIG. 2 and FIG. 3 .

As shown in FIG2 , the electrosorption device for separating soluble total solids in wastewater further includes a support frame 11, a hydraulic mechanism 12, a pressure plate 13, a guard plate 14 and a first connecting rod 15. A plurality of electrosorption units 100 are stacked in sequence to form a treatment assembly, and the guard plates 14 are located on both sides of the treatment assembly, and the guard plates 14 are slidably disposed on the support frame 11. The first connecting rod 15 is movably disposed in the mounting holes of the two guard plates 14. A baffle 11a is also disposed on one side of the support frame 11, and a hydraulic mechanism 12 is also disposed on the side of the support frame 11 opposite to the baffle 11a, and the hydraulic mechanism 12 is connected to the pressure plate 13, and the pressure plate 13 is slidably disposed on the support frame 11, and the hydraulic mechanism 12 can drive the pressure plate 13 to move toward the direction of the baffle 11a, so that the plurality of electrosorption units 100 can be clamped and fixed.

FIG3 shows another schematic diagram of a preferred embodiment of an electrosorption device for separating soluble total solids in wastewater. As shown in FIG3, the electrosorption device for separating soluble total solids in wastewater also includes a fastening plate 16 and a second connecting rod 17. A plurality of electrosorption units 100 are stacked in sequence to form a treatment assembly, the fastening plates 16 are located on both sides of the treatment assembly, the fastening plates 16 are provided with mounting holes, the second connecting rod 17 is installed in the mounting holes, and the ends of the second connecting rod 17 are provided with threaded structures, and the two fastening plates 16 can clamp and fix the plurality of electrosorption units 100 by means of bolts 18 sleeved on the threaded structures.

Preferably, the processing capacity of each electrosorption unit 100 can be determined based on actual needs. Preferably, each electrosorption unit 100 is independent of each other, and multiple electrosorption units 100 are arranged in parallel, so as to improve the wastewater treatment capacity of the electrosorption device for separating soluble total solids in wastewater.

The following is an explanation using the example of monovalent salt and divalent salt in wastewater.

Preferably, the electrosorption unit 100 includes at least a first electrosorption component 110, a pretreatment component 120, and a second electrosorption component 130, as shown in FIG1. More preferably, the water inlet of the first electrosorption component 110 is connected to the water outlet of the raw water, and the first electrosorption component 110 is used to separate the raw water into a first salt concentrate and a first treated water, and the water outlet of the first electrosorption component 110 is connected to the water inlet of the pretreatment component 120; the pretreatment component 120 is used to separate the charged cations from the charged anions in the first treated water, and the water outlet of the pretreatment component 120 is connected to the water inlet of the second electrosorption component 130, and the charged cations and charged anions in the first treated water enter the water production channel and the concentration channel of the second electrosorption component 130 respectively; the second electrosorption component 130 is used to separate the first treated water into a second salt concentrate and a second treated water, as shown in FIG1. Exemplarily, the first salt is a monovalent salt, and the second salt is a divalent salt.

More preferably, the first electroadsorption component 110 also has a first external voltage component 111, the second electroadsorption component 130 also has a second external voltage component 131, and the pretreatment component 120 also has a third external voltage component 121, the polarity of the third external voltage component 121 is opposite to the polarity of the first external voltage component 111, and the polarity of the third external voltage component 121 is also opposite to the polarity of the second external voltage component 131, as shown in Figure 1.

It can be seen that the opposite polarity mentioned here means that the placement position of the anode plate and the cathode plate of the third external voltage component 121 is opposite to the placement position of the anode plate and the cathode plate of the first external voltage component 111; at the same time, the placement position of the anode plate and the cathode plate of the third external voltage component 121 is also opposite to the placement position of the anode plate and the cathode plate of the second external voltage component 131, as shown in Figure 1.

Exemplarily, the working voltages of the first external voltage element 111 and the second external voltage element 131 can adopt the working voltage values in the prior art. Further, in order to ensure the separation effect of charged cations and charged anions in the first treated water, the working voltage of the third external voltage element 121 can be slightly greater than the working voltages of the first external voltage element 111 and the second external voltage element 131.

The electric adsorption device for separating total soluble solids in wastewater in this embodiment can separate the first salt in the raw water through the action of the first electric adsorption component 110, and then the first treated water treated by the first electric adsorption component 110 enters the second electric adsorption component 130, and the second salt in the raw water can be separated through the action of the second electric adsorption component 130, so that the treated produced water can be obtained, and the separation of water, the first salt and the second salt in the raw water can be achieved. It can be seen that the electric adsorption device for separating total soluble solids in wastewater in this embodiment can solve the technical problem that the electric adsorption device for separating total soluble solids in wastewater in the related art cannot separate multiple salts in the wastewater.

Since the service life of anion selective exchange membranes and cation selective exchange membranes is limited, when treating wastewater through an electrosorption device for separating total dissolved solids in wastewater, it is necessary to regularly replace the anion selective exchange membranes and cation selective exchange membranes, resulting in a high cost of using the electrosorption device for separating total dissolved solids in wastewater. In particular, for the form of multi-stage electrosorption component connection, the number of membranes that need to be replaced each time is greater. Taking the first electrosorption component 110 and the second electrosorption component 130 connected in series to achieve the separation of the first salt and the second salt in the wastewater as an example, the first electrosorption component 110 and the second electrosorption component 130 each contain two anion selective exchange membranes and one cation selective exchange membrane, and each time they are replaced, at least 6 ion selective exchange membranes need to be replaced, resulting in a high cost of replacing the membrane during the use of the electrosorption device for separating total dissolved solids in wastewater.

Regarding the method of connecting two-stage electrosorption components in series to achieve the separation of two salts in wastewater, since the anion selective exchange membrane and cation selective exchange membrane in each electrosorption component require specific anion selective exchange membranes and specific cation selective exchange membranes so that each stage of the electrosorption component can separate and concentrate specific salts, usually the specific anion selective exchange membranes and specific cation selective exchange membranes are more expensive than ordinary anion selective exchange membranes and cation selective exchange membranes, which further aggravates the problem of high membrane replacement cost during the use of the electrosorption device.

The present embodiment is an electrosorption device for separating soluble total solids in wastewater. A pretreatment component 120 is provided between the first electrosorption component 110 and the second electrosorption component 130. The pretreatment component 120 can separate the charged cations from the charged anions in the first treated water. Specifically, by controlling the voltage intensity of the third external voltage component 121 and/or providing a guide component, most of the separated charged cations can enter the water production channel, and most of the charged anions can enter the concentration channel, which is beneficial to reducing the use cost of the electrosorption device for separating soluble total solids in wastewater.

The specific analysis is as follows: in the case where the pretreatment component 120 is not set, the first treated water treated by the first electrosorption component 110 directly enters the water production channel and the concentration channel of the second electrosorption component 130, and the charged anions in the water production channel need to pass through a layer of anion selective exchange membrane to reach the chamber near the anode of the second external voltage component 131 (that is, the third electrode chamber 132), and then enter the chamber near the cathode of the second external voltage component 131 (that is, the fourth electrode chamber 133) through the circulation of the electrode liquid, and finally need to pass through a layer of anion selective exchange membrane to reach the concentration channel; the charged cations in the water production channel can reach the concentration channel by passing through a layer of cation selective exchange membrane, and the charged cations reaching the concentration channel combine with the charged anions reaching the concentration channel to form a second salt, thereby increasing the concentration of the second salt in the concentration channel, thereby achieving purification of the first treated water in the water production channel and concentration of the second salt in the concentration channel.

It can be seen from the movement trajectories of the charged anions and charged cations in the above-mentioned water production channel that when concentrating the second salt, the charged anions in the first treated water need to pass through two layers of anion selective exchange membranes, and the charged cations need to pass through one layer of cation selective exchange membrane.

The present embodiment is an electrosorption device for separating total soluble solids in wastewater. Through the action of the pretreatment component 120, when most of the separated charged cations enter the water production channel and most of the charged anions enter the concentration channel, only a small amount of charged anions need to pass through two layers of anion selective exchange membranes to reach the concentration channel, while most of the charged anions do not need to pass through two layers of anion selective exchange membranes to reach the concentration channel. When the membrane is replaced, the replacement frequency of the anion selective exchange membrane can be reduced, which is also beneficial to reducing the use cost of the electrosorption device for separating total soluble solids in wastewater.

The inventors found in their research that by setting the pretreatment component 120, the load of the cation selective exchange membrane in the second electrosorption component 130 may be increased to a certain extent, and the service life of the cation selective exchange membrane may be reduced. However, since the cation selective exchange membrane itself needs to pass cations, coupled with the shunting effect, the load increase of the cation selective exchange membrane is not obvious. Even if it is necessary to increase the replacement frequency of the cation selective exchange membrane and increase the use cost of the cation selective exchange membrane, compared with the cost reduction brought by the anion selective exchange membrane, the overall use cost of the electrosorption device for separating the total soluble solids in wastewater in this embodiment can still be reduced.

It should be noted that although the pretreatment component 120 increases the number of cations entering the water production channel, it can reduce the number of electrode reversals in the subsequent treatment process, thereby reducing the number of charged cations flowing back from the concentration channel to the water production channel.

According to an optional embodiment, the first electrosorption component 110 has a first electrode chamber 112, a second electrode chamber 113, a first fluid channel 114 and a second fluid channel 115, as shown in FIG1 . Exemplarily, the first electrode chamber 112 is arranged close to the positive electrode of the first external voltage element 111, and the second electrode chamber 113 is arranged close to the negative electrode of the first external voltage element 111, as shown in FIG1 . The first fluid channel 114 and the second fluid channel 115 are located between the first electrode chamber 112 and the second electrode chamber 113, as shown in FIG1 . The first electrode chamber 112 and the second electrode chamber 113 are filled with electrode liquid, the first fluid channel 114 is used to pass raw water, and the second fluid channel 115 is used to pass pure water. Exemplarily, the electrode liquid in the first electrode chamber 112 and the second electrode chamber 113 is a saturated solution of the first salt to be separated. A first anion selective exchange membrane 116 is provided between the first electrode chamber 112 and the first fluid channel 114, and between the second fluid channel 115 and the second electrode chamber 113, and a first cation selective exchange membrane 117 is provided between the first fluid channel 114 and the second fluid channel 115, as shown in Figure 1. The first anion selective exchange membrane 116 and the first cation selective exchange membrane 117 are specific anion selective exchange membranes and cation selective exchange membranes. Exemplarily, the first anion selective exchange membrane 116 is a monovalent anion selective exchange membrane, and the first cation selective exchange membrane 117 is a monovalent cation selective exchange membrane. Accordingly, the first anion mentioned below is a monovalent anion, and the first cation is a monovalent cation.

As shown in FIG1 , after raw water is introduced into the first fluid channel 114 and pure water is introduced into the second fluid channel 115, the first anion in the raw water passes through the first anion selective exchange membrane 116 and enters the first electrode chamber 112, and then enters the second electrode chamber 113 under the circulation of the electrode liquid, and the first anion in the second electrode chamber 113 passes through the first anion selective exchange membrane 116 again and enters the second fluid channel 115; the first cation in the raw water passes through the first cation selective exchange membrane 117 and enters the second fluid channel 115, and the first cation and the first anion entering the second fluid channel 115 combine to form the first salt, and then are discharged from the outlet of the second fluid channel 115. It can be seen that the first treated water flowing from the outlet of the first fluid channel 114 is the water after the first salt is removed.

According to an optional embodiment, the first electrode chamber 112 has a first outlet 1121 and a first inlet 1122, and the second electrode chamber 113 has a second outlet 1131 and a second inlet 1132, as shown in FIG1. The first outlet 1121 is located at the upper end of the first electrode chamber 112, the first inlet 1122 is located at the lower end of the first electrode chamber 112, the second outlet 1131 is located at the upper end of the second electrode chamber 113, the second inlet 1132 is located at the lower end of the second electrode chamber 113, the first outlet 1121 is communicated with the second inlet 1132, and the first inlet 1122 is communicated with the second outlet 1131, as shown in FIG1.

Since the ion concentration in the raw water just entering the first fluid channel 114 is relatively high, the first anions that pass through the first anion selective exchange membrane 116 and enter the first electrode chamber 112 are distributed at a relatively high concentration at the top. The first outlet 1121 is located at the upper end of the first electrode chamber 112, and the second inlet 1132 is located at the lower end of the second electrode chamber 113, which helps to circulate more first anions to the second electrode chamber 113, and most of the first anions circulated to the second electrode chamber 113 are located below the second electrode chamber 113; at the same time, the concentration of the first anions above the second electrode chamber 113 is relatively low. When the electrode liquid of the second electrode chamber 113 is circulated to the first electrode chamber 112, the second outlet 1131 is located at the upper end of the second electrode chamber 113, which can minimize the first anions circulated to the first electrode chamber 112. In addition, most of the first anions circulating into the second electrode chamber 113 are located below the second electrode chamber 113 , which can prevent excessive first anions from reducing the electric field strength, thereby facilitating the first cations in the first fluid channel 114 to enter the second fluid channel 115 .

The preferred technical solution of this embodiment is an electric adsorption device for separating soluble total solids in wastewater. By limiting the entrance and exit positions of the first electrode chamber 112 and the second electrode chamber 113, the first anions can enter the second fluid channel 115 as much as possible, which helps to improve the concentration effect of the first salt in the second fluid channel 115 and increase the concentration multiple of the first salt.

According to an optional embodiment, the second electrosorption component 130 has a third electrode chamber 132, a fourth electrode chamber 133, a third fluid channel 134 and a fourth fluid channel 135, as shown in FIG1. Exemplarily, the third electrode chamber 132 is arranged near the positive electrode of the second external voltage element 131, and the fourth electrode chamber 133 is arranged near the negative electrode of the second external voltage element 131, as shown in FIG1. The third fluid channel 134 and the fourth fluid channel 135 are located between the third electrode chamber 132 and the fourth electrode chamber 133, as shown in FIG1. The third electrode chamber 132 and the fourth electrode chamber 133 are filled with electrode liquid, and the third fluid channel 134 and the fourth fluid channel 135 are used to pass the first treated water. Exemplarily, the electrode liquid in the third electrode chamber 132 and the fourth electrode chamber 133 is a saturated solution of the second salt to be separated. A second anion selective exchange membrane 136 is disposed between the third electrode chamber 132 and the third fluid channel 134 and between the fourth fluid channel 135 and the fourth electrode chamber 133 , and a second cation selective exchange membrane 137 is disposed between the third fluid channel 134 and the fourth fluid channel 135 , as shown in FIG. 1 .

The second anion selective exchange membrane 136 and the second cation selective exchange membrane 137 are specific anion selective exchange membranes and cation selective exchange membranes. Exemplarily, the second anion selective exchange membrane 136 is a divalent anion selective exchange membrane, and the second cation selective exchange membrane 137 is a divalent cation selective exchange membrane. Accordingly, the second anion mentioned below is a divalent anion, and the second cation is a divalent cation.

As shown in FIG1 , through the action of the pretreatment component 120, when most of the separated charged cations enter the third fluid channel 134 and most of the charged anions enter the fourth fluid channel 135, a small amount of second anions in the first treated water in the third fluid channel 134 pass through the second anion selective exchange membrane 136 to enter the third electrode chamber 132, and then enter the fourth electrode chamber 133 under the circulation of the electrode liquid, and the second anions in the fourth electrode chamber 133 pass through the second anion selective exchange membrane 136 again to enter the fourth fluid channel 135; a large amount of second cations in the first treated water in the third fluid channel 134 pass through the second cation selective exchange membrane 137 to enter the fourth fluid channel 135, and the second cations and second anions entering the fourth fluid channel 135 combine to form the second salt, and then are discharged from the outlet of the fourth fluid channel 135. It can be seen that the water flowing from the outlet of the third fluid channel 134 is the water after the second salt is removed.

Exemplarily, the water flowing out of the outlet of the third fluid channel 134 can also be circulated into the second fluid channel 115, so that the electric adsorption device for separating total dissolved solids in wastewater of this embodiment does not need to add additional water when in use.

According to an optional embodiment, the third electrode chamber 132 has a third outlet 1321 and a third inlet 1322, and the fourth electrode chamber 133 has a fourth outlet 1331 and a fourth inlet 1332, as shown in Figure 1. The third outlet 1321 is located at the upper end of the third electrode chamber 132, the third inlet 1322 is located at the lower end of the third electrode chamber 132, the fourth outlet 1331 is located at the upper end of the fourth electrode chamber 133, the fourth inlet 1332 is located at the lower end of the fourth electrode chamber 133, the third outlet 1321 is connected to the fourth inlet 1332, and the third inlet 1322 is connected to the fourth outlet 1331, as shown in Figure 1.

Through the action of the pretreatment component 120, when most of the separated charged cations enter the third fluid channel 134 and most of the charged anions enter the fourth fluid channel 135, since the ion concentration in the first treated water just entering the third fluid channel 134 is relatively high, the second anions that pass through the second anion selective exchange membrane 136 and enter the third electrode chamber 132 have a relatively high distribution concentration at the top. The third outlet 1321 is located at the upper end of the third electrode chamber 132, and the fourth inlet 1332 is located at the lower end of the fourth electrode chamber 133, which helps to circulate more second anions to the fourth electrode chamber 133, and most of the second anions circulated to the fourth electrode chamber 133 are located below the fourth electrode chamber 133; at the same time, the concentration of the second anions above the fourth electrode chamber 133 is relatively small. When the electrode liquid of the fourth electrode chamber 133 is circulated to the third electrode chamber 132, the fourth outlet 1331 is located at the upper end of the fourth electrode chamber 133, which can minimize the second anions circulated to the third electrode chamber 132.

The preferred technical solution of this embodiment is an electric adsorption device for separating soluble total solids in wastewater. By limiting the entrance and exit positions of the third electrode chamber 132 and the fourth electrode chamber 133, the second anions can enter the fourth fluid channel 135 as much as possible, which helps to improve the concentration effect of the second salt in the fourth fluid channel 135 and increase the concentration multiple of the second salt.

It is known that each circulation route also has a circulation pump, which is not shown in FIG. 1 .

According to an optional embodiment, the side of the third external voltage element 121 close to the third electrode chamber 132 is a negative electrode, and the side of the third external voltage element 121 close to the fourth electrode chamber 133 is a positive electrode, as shown in Figure 1. Under the action of the third external voltage element 121, the charged cations in the first treated water move toward the direction close to the negative electrode of the third external voltage element 121, and the charged anions in the first treated water move toward the direction close to the positive electrode of the third external voltage element 121, so that the charged cations and charged anions in the first treated water can be separated.

Preferably, the pretreatment component 120 has a pretreatment chamber 122, and a third anion selective exchange membrane 123 is provided on the side of the pretreatment chamber 122 close to the negative electrode of the third external voltage element 121, and a third cation selective exchange membrane 124 is provided on the side of the pretreatment chamber 122 close to the positive electrode of the third external voltage element 121. As shown in FIG1 , electrode liquid chambers are also provided on both sides of the pretreatment chamber 122, and electrode liquid is stored in the electrode liquid chambers.

Exemplarily, the third anion selective exchange membrane 123 can be a monovalent anion selective exchange membrane, specifically, the first anion selective exchange membrane 116 in the first electrosorption component 110 is extended to the pretreatment chamber 122; the third cation selective exchange membrane 124 can be a monovalent cation selective exchange membrane, specifically, the first cation selective exchange membrane 117 in the first electrosorption component 110 is extended to the pretreatment chamber 122.

Exemplarily, the third anion selective exchange membrane 123 can be a divalent anion selective exchange membrane, specifically, the second anion selective exchange membrane 136 in the second electrosorption component 130 is extended to the pretreatment chamber 122; the third cation selective exchange membrane 124 can be a divalent cation selective exchange membrane, specifically, the second cation selective exchange membrane 137 in the second electrosorption component 130 is extended to the pretreatment chamber 122.

After the first treated water enters the pretreatment chamber 122, under the action of the third external voltage element 121, the charged cations in the first treated water move toward the direction close to the negative electrode of the third external voltage element 121. Since the third anion selective exchange membrane 123 is provided on the side of the pretreatment chamber 122 close to the negative electrode of the third external voltage element 121, the charged cations in the first pretreatment water cannot pass through the third anion selective exchange membrane 123 and enter the electrode liquid chamber, so the charged cations in the first pretreatment water can enter the third fluid channel 134 with the water flow. Similarly, under the action of the third external voltage element 121, the charged anions in the first treated water move toward the direction close to the positive electrode of the third external voltage element 121. Since the third cation selective exchange membrane 124 is provided on the side of the pretreatment chamber 122 close to the positive electrode of the third external voltage element 121, the charged anions in the first pretreatment water cannot pass through the third cation selective exchange membrane 124 and enter the electrode liquid chamber, so the charged anions in the first pretreatment water can enter the fourth fluid channel 135 with the water flow.

Without limitation, the third anion selective exchange membrane 123 may not be provided between the first electrode plate 150 and the first current balancing plate 170, and between the second current balancing plate 180 and the second electrode plate 160 in the pretreatment component 120, and the third cation selective exchange membrane 124 may not be provided between the first current balancing plate 170 and the second current balancing plate 180. At this time, the charged particles enriched on the electrode may fall off the electrode and be washed away by the power failure, instantaneous reverse connection or voltage change of the third external voltage element 121, so that the charged cations and charged anions in the first treated water can enter the second electric adsorption component 130, and the electrode can also be regenerated.

Preferably, the electric adsorption device for separating dissolved total solids in wastewater further includes a flow guide 140, as shown in FIG1 . The flow guide 140 is located at the outlet of the pretreatment component 120, at the inlet of the second electric adsorption component 130, or between the pretreatment component 120 and the second electric adsorption component 130. The projection of the flow guide 140 in the first direction is located in the third fluid channel 134, and the first direction is a direction perpendicular to the central axis of the third fluid channel 134. As shown in FIG1 , the first direction is also a horizontal direction.

If there is no guide member 140, the first treated water discharged from the pretreatment component 120 will all enter the third fluid channel 134. The preferred technical solution of this embodiment is used for the electric adsorption device for separating the total dissolved solids in wastewater. By setting the guide member 140, and the projection of the guide member 140 in the first direction is located in the third fluid channel 134, part of the first treated water entering the third fluid channel 134 can be intercepted, so that part of the first treated water discharged from the pretreatment component 120 enters the third fluid channel 134, and part enters the fourth fluid channel 135.

More preferably, the water-facing surface 141 of the guide member 140 is an inclined structure, as shown in Figures 1 and 7. The water-facing surface 141 of the guide member 140, that is, the side of the guide member 140 facing upward, is an inclined structure. Specifically, the water-facing surface 141 is inclined downward, which is conducive to guiding a portion of the first treated water discharged from the pretreatment component 120 into the fourth fluid channel 135. More preferably, the guide member 140 is located on a side close to the second cation selective exchange membrane 137, as shown in Figures 1 and 7. Exemplarily, the width of the guide member 140 in the third fluid channel 134 satisfies: L ₁ ≤1/2L, wherein L ₁ is the width of the guide member 140 in the third fluid channel 134, and L is the width of the third fluid channel 134. As shown in FIG. 1 and FIG. 7 , the width of the guide member 140 in the third fluid channel 134 satisfies: L ₁ ≤ 1/2L, so that most of the first treated water discharged from the pretreatment component 120 can enter the third fluid channel 134, and a small part can enter the fourth fluid channel 135, so that the liquid in the fourth fluid channel 135 is less, which helps to increase the concentration of the second salt in the fourth fluid channel 135.

According to an optional embodiment, the electrosorption unit 100 includes a first electrode plate 150, a second electrode plate 160, a first current equalizing plate 170 and a second current equalizing plate 180. Exemplarily, the first electrode plate 150 and the second electrode plate 160 are basic structural members that can provide a mounting base for the electrodes. Specifically, the first electrode plate 150 and the second electrode plate 160 can provide a mounting base for the electrodes in the first electrosorption component 110, the pretreatment component 120 and the second electrosorption component 130. Exemplarily, the electrodes in the first electrosorption component 110, the pretreatment component 120 and the second electrosorption component 130 can be, but are not limited to, graphite electrodes.

In some embodiments, the first current balancing plate 170 and the second current balancing plate 180 are located between the first electrode plate 150 and the second electrode plate 160, as shown in Figures 4 to 9. Preferably, the first electrode plate 150, the second electrode plate 160, the first current balancing plate 170 and the second current balancing plate 180 are plate-like structures that penetrate the first electric adsorption component 110, the pretreatment component 120 and the second electric adsorption component 130.

Preferably, in the portion located at the first electro-adsorption component 110, a first anion selective exchange membrane 116 is provided between the first electrode plate 150 and the first current balancing plate 170, a first cation selective exchange membrane 117 is provided between the first current balancing plate 170 and the second current balancing plate 180, and a first anion selective exchange membrane 116 is provided between the second current balancing plate 180 and the second electrode plate 160, as shown in FIGS. 4 and 9. Thus, a first electrode chamber 112 is formed between the first electrode plate 150 and the first current balancing plate 170; a first fluid channel 114 is formed between the first anion selective exchange membrane 116 and the first cation selective exchange membrane 117 close to the first electrode plate 150, and the first current balancing plate 170 is located in the first fluid channel 114; a second fluid channel 115 is formed between the first anion selective exchange membrane 116 and the first cation selective exchange membrane 117 close to the second electrode plate 160, and the second current balancing plate 180 is located in the second fluid channel 115; and a second electrode chamber 113 is formed between the second current balancing plate 180 and the second electrode plate 160.

Preferably, in the portion located at the second electro-adsorption component 130, a second anion selective exchange membrane 136 is further provided between the first electrode plate 150 and the first current balancing plate 170, a second cation selective exchange membrane 137 is further provided between the first current balancing plate 170 and the second current balancing plate 180, and a second anion selective exchange membrane 136 is further provided between the second current balancing plate 180 and the second electrode plate 160, as shown in Figures 8 and 9. Thereby, a third electrode chamber 132 is formed between the first electrode plate 150 and the first current balancing plate 170; a first fluid channel 114 is formed between the second anion selective exchange membrane 136 and the second cation selective exchange membrane 137 close to the first electrode plate 150, and the first current balancing plate 170 is located in the first fluid channel 114; a second fluid channel 115 is formed between the second anion selective exchange membrane 136 and the second cation selective exchange membrane 137 close to the second electrode plate 160, and the second current balancing plate 180 is located in the second fluid channel 115; and a fourth electrode chamber 133 is formed between the second current balancing plate 180 and the second electrode plate 160.

More preferably, a flow balancing structure 190 is provided on the first electrode plate 150, the second electrode plate 160, the first flow balancing plate 170 and the second flow balancing plate 180, and the flow balancing structure 190 is located at the entrance and/or exit of each chamber, as shown in Figures 9 to 13. When the flow balancing structure 190 is located at the entrance of each chamber, the flow balancing structure 190 can make the water flow entering each chamber evenly distributed; when the flow balancing structure 190 is located at the exit of each chamber, the flow balancing structure 190 can make the water flow in each chamber evenly flow out, thereby facilitating the improvement of the wastewater treatment effect and the improvement of the wastewater treatment efficiency.

According to an optional embodiment, the current balancing structure 190 includes a first current balancing structure 191, as shown in Figures 10 and 11. Preferably, the first current balancing structure 191 is a groove structure and/or a slot-less structure, and the first current balancing structure 191 located at the entrance and exit of each chamber gradually increases in width and gradually decreases in depth from away from each chamber side to close to each chamber side. Exemplarily, the first current balancing structure 191 located on the first electrode plate 150 and the second electrode plate 160 is a groove structure, and the first current balancing structure 191 located on the first current balancing plate 170 and the second current balancing plate 180 is a slot-less structure.

When the first flow-equalizing structure 191 is located at the entrance of each chamber, the water flow entering the entrance passes through the side with a smaller width of the first flow-equalizing structure 191, and then gradually flows to the side with a larger width. In addition, the depth of the first flow-equalizing structure 191 gradually decreases and the squeezing effect of the membrane can "flatten" the water flow entering the first flow-equalizing structure 191, thereby achieving uniform distribution of the water flow. When the first flow-equalizing structure 191 is located at the outlet of each chamber, the water flow passes through the side with a larger width of the first flow-equalizing structure 191, and then gradually flows to the side with a smaller width, thereby achieving uniform water flow at each outlet to achieve uniform water discharge.

In some optional embodiments, along the direction in which the electrode liquid enters the second electrode chamber 113, the flow direction of the first flow-equalizing structure 191 on the second electrode plate 160 is inclined toward the direction close to the second fluid channel 115. Exemplarily, the notch of the first flow-equalizing structure 191 faces the second fluid channel 115, and the depth of the first flow-equalizing structure 191 gradually decreases along the direction in which the electrode liquid enters the second electrode chamber 113. In this way, after the electrode liquid enters the second electrode chamber 113, it has a component velocity toward the second fluid channel 115, which is beneficial for the charged anions in the electrode liquid to enter the second fluid channel 115.

In a further optional embodiment, along the direction in which the electrode liquid flows out of the second electrode chamber 113, the flow direction of the first flow-equalizing structure 191 on the second electrode plate 160 is inclined in the direction away from the second fluid channel 115. Exemplarily, the notch of the first flow-equalizing structure 191 faces the second fluid channel 115, and the depth of the first flow-equalizing structure 191 gradually increases along the direction in which the electrode liquid flows out of the second electrode chamber 113. This is beneficial to prevent the charged anions in the second electrode chamber 113 from flowing out of the second fluid channel 115, and further to prevent the charged anions in the second electrode chamber 113 from circulating with the electrode liquid into the first electrode chamber 112.

Preferably, the flow balancing structure 190 includes a second flow balancing structure 192, as shown in Figures 10 and 11. The second flow balancing structure 192 is a water balancing structure formed by a plurality of baffles 1921 arranged at intervals, a channel is formed between two adjacent baffles 1921, and the thickness of the baffles 1921 gradually increases from both ends to the middle, as shown in Figure 11. When the first flow balancing structure 191 is located at the entrance or exit of each chamber, the water flow entering the chamber or the water flow flowing out of the chamber first passes through the second flow balancing structure 192, and the water flow can be evenly dispersed into the channel formed between two adjacent baffles 1921 through the blocking effect of the baffle 1921, thereby achieving uniform entry or uniform outflow of the water flow.

The preferred technical solution of this embodiment is an electric adsorption device for separating dissolved total solids in wastewater, and the flow-equalizing structure 190 may include only the first flow-equalizing structure 191, or only the second flow-equalizing structure 192, or both the first flow-equalizing structure 191 and the second flow-equalizing structure 192. When the flow-equalizing structure 190 includes both the first flow-equalizing structure 191 and the second flow-equalizing structure 192, the second flow-equalizing structure 192 is located on the side with a larger width of the first flow-equalizing structure 191, thereby facilitating further strengthening the effect of the water flow entering the chamber uniformly or the water flow flowing out of the chamber uniformly.

The second aspect of this embodiment describes the wastewater treatment system of the present invention in detail.

The wastewater treatment system of this embodiment includes an electric adsorption device 10 for separating total dissolved solids in wastewater according to any one of the technical solutions in this embodiment, as shown in FIG14. Without limitation thereto, the wastewater treatment system of this embodiment also includes a wastewater collection tank 20, a first filter 30, a raw water tank 40, a second filter 50, a water production tank 60 and a concentrated water tank 70. The concentrated water tank 70 includes at least a first concentrated water tank 71 and a second concentrated water tank 72, as shown in FIG14.

The wastewater collection tank 20 is used to collect wastewater to be treated. The wastewater collection tank 20 is connected to the first filter 30, so that the wastewater to be treated can be filtered once through the first filter 30, as shown in Figure 14. The first filter 30 is preferably a gravity flow multi-media filter. The first filter 30 is also connected to the raw water tank 40, and the wastewater filtered by the first filter 30 enters the raw water tank 40 for collection, as shown in Figure 14.

The raw water pool 40 is connected to the second filter 50, so that the wastewater in the raw water pool 40 can be secondary filtered through the second filter 50, as shown in Figure 14. The second filter 50 is preferably a security filter.

The second filter 50 is also connected to the electric adsorption device 10 for separating the total dissolved solids in the wastewater, so that the salt in the wastewater can be separated by the electric adsorption device 10 for separating the total dissolved solids in the wastewater, as shown in Figure 14. The electric adsorption device 10 for separating the total dissolved solids in the wastewater is also connected to the water production tank 60 and the concentrated water tank 70, so that the water produced by the electric adsorption device 10 for separating the total dissolved solids in the wastewater can enter the water production tank 60 for collection, the first salt concentrate separated by the electric adsorption device 10 for separating the total dissolved solids in the wastewater enters the first concentrated water tank 71 for collection, and the separated second salt concentrate enters the second concentrated water tank 72 for collection, as shown in Figure 14.

The wastewater treatment system of this embodiment includes the electrosorption device 10 for separating the total soluble solids in the wastewater according to any one of the technical solutions in this embodiment. The electrosorption device 10 for separating the total soluble solids in the wastewater can achieve graded concentration of various salts in the wastewater, and can also improve the concentration efficiency of the first salt.

It should be noted that, in this article, the terms "comprise", "include" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, an element defined by the sentence "comprises one..." does not exclude the presence of other identical elements in the process, method, article or device including the element. In addition, it should be noted that the scope of the method and device in the embodiment of the present application is not limited to performing functions in the order shown or discussed, and may also include performing functions in a substantially simultaneous manner or in reverse order according to the functions involved, for example, the described method may be performed in an order different from that described, and various steps may also be added, omitted, or combined. In addition, the features described with reference to certain examples may be combined in other examples.

The above description is only a specific implementation mode of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed by the present invention, which should be covered by the protection scope of the present invention.

Claims (10)

1. An electro-adsorption device for separating dissolved total solids in wastewater, comprising a plurality of electro-adsorption units (100), the electro-adsorption units (100) comprising at least a first electro-adsorption module (110), a pretreatment module (120) and a second electro-adsorption module (130), wherein,

The water inlet of the first electric adsorption component (110) is communicated with the raw water outlet, the first electric adsorption component (110) is used for separating raw water into a first salt concentrated solution and first treated water, the water outlet of the first electric adsorption component (110) is communicated with the water inlet of the pretreatment component (120), the pretreatment component (120) is used for separating charged cations and charged anions in the first treated water, the water outlet of the pretreatment component (120) is communicated with the water inlet of the second electric adsorption component (130), the charged cations and the charged anions in the first treated water respectively enter a water production channel and a concentration channel of the second electric adsorption component (130), the second electric adsorption component (130) is used for separating the first treated water into a second salt concentrated solution and second treated water, and

The first electro-absorption component (110) is further provided with a first external electric component (111), the second electro-absorption component (130) is further provided with a second external electric component (131), the pretreatment component (120) is further provided with a third external electric component (121), the polarity of the third external electric component (121) is opposite to that of the first external electric component (111), and meanwhile, the polarity of the third external electric component (121) is opposite to that of the second external electric component (131).

2. The electro-adsorption device for separating total dissolved solids from wastewater of claim 1 wherein the first electro-adsorption assembly (110) has a first electrode chamber (112), a second electrode chamber (113), a first fluid passage (114) and a second fluid passage (115), the first electrode chamber (112) being disposed proximate to the positive electrode of the first external electrical component (111), the second electrode chamber (113) being disposed proximate to the negative electrode of the first external electrical component (111), the first fluid passage (114) and the second fluid passage (115) being located between the first electrode chamber (112) and the second electrode chamber (113), wherein,

Electrode liquid is filled in the first electrode chamber (112) and the second electrode chamber (113), raw water is introduced into the first fluid channel (114), pure water is introduced into the second fluid channel (115), a first anion selective exchange membrane (116) is arranged between the first electrode chamber (112) and the first fluid channel (114) and between the second fluid channel (115) and the second electrode chamber (113), and a first cation selective exchange membrane (117) is arranged between the first fluid channel (114) and the second fluid channel (115).

3. The electro-adsorption device for separating total dissolved solids from wastewater of claim 2 wherein the first electrode chamber (112) has a first outlet (1121) and a first inlet (1122), the second electrode chamber (113) has a second outlet (1131) and a second inlet (1132), and

The first outlet (1121) is located at the upper end of the first electrode chamber (112), the first inlet (1122) is located at the lower end of the first electrode chamber (112), the second outlet (1131) is located at the upper end of the second electrode chamber (113), the second inlet (1132) is located at the lower end of the second electrode chamber (113), the first outlet (1121) is communicated with the second inlet (1132), and the first inlet (1122) is communicated with the second outlet (1131).

4. The electro-adsorption device for separating total dissolved solids in wastewater of claim 1 wherein the second electro-adsorption assembly (130) has a third electrode chamber (132), a fourth electrode chamber (133), a third fluid passage (134) and a fourth fluid passage (135), the third electrode chamber (132) being disposed proximate to the positive electrode of the second external electrical component (131), the fourth electrode chamber (133) being disposed proximate to the negative electrode of the second external electrical component (131), the third fluid passage (134) and the fourth fluid passage (135) being located between the third electrode chamber (132) and the fourth electrode chamber (133), wherein,

Electrode liquid is filled in the third electrode chamber (132) and the fourth electrode chamber (133), first treatment water is introduced into the third fluid channel (134) and the fourth fluid channel (135), a second anion selective exchange membrane (136) is arranged between the third electrode chamber (132) and the third fluid channel (134) and between the fourth fluid channel (135) and the fourth electrode chamber (133), and a second cation selective exchange membrane (137) is arranged between the third fluid channel (134) and the fourth fluid channel (135).

5. The electro-adsorption device for separating total dissolved solids from wastewater of claim 4 wherein the third electrode chamber (132) has a third outlet (1321) and a third inlet (1322), the fourth electrode chamber (133) has a fourth outlet (1331) and a fourth inlet (1332), and

The third outlet (1321) is located at the upper end of the third electrode chamber (132), the third inlet (1322) is located at the lower end of the third electrode chamber (132), the fourth outlet (1331) is located at the upper end of the fourth electrode chamber (133), the fourth inlet (1332) is located at the lower end of the fourth electrode chamber (133), the third outlet (1321) is communicated with the fourth inlet (1332), and the third inlet (1322) is communicated with the fourth outlet (1331).

6. The electro-adsorption device for separating total dissolved solids from wastewater of claim 4 wherein said third external electrical component (121) is negative on a side adjacent said third electrode chamber (132), said third external electrical component (121) is positive on a side adjacent said fourth electrode chamber (133), and

The electric adsorption device for separating total dissolved solids in wastewater further comprises a flow guide piece (140), wherein the flow guide piece (140) is positioned at the outlet of the pretreatment component (120), at the inlet of the second electric adsorption component (130) or between the pretreatment component (120) and the second electric adsorption component (130), the projection of the flow guide piece (140) in a first direction is positioned in the third fluid channel (134), the upstream surface (141) of the flow guide piece (140) is of an inclined surface structure, and the first direction is a direction perpendicular to the central axis of the third fluid channel (134).

7. The electro-adsorption device for separating total dissolved solids from wastewater of claim 1, wherein the pretreatment assembly (120) has a pretreatment chamber (122), a third anion selective exchange membrane (123) is disposed on a side of the pretreatment chamber (122) adjacent to a negative electrode of the third external electric component (121), and a third cation selective exchange membrane (124) is disposed on a side of the pretreatment chamber (122) adjacent to a positive electrode of the third external electric component (121).

8. The electro-adsorption device for separating total dissolved solids from wastewater of any one of claims 1-7 wherein the electro-adsorption unit (100) comprises a first electrode plate (150), a second electrode plate (160), a first flow equalization plate (170) and a second flow equalization plate (180), the first flow equalization plate (170) and the second flow equalization plate (180) being located between the first electrode plate (150) and the second electrode plate (160), wherein,

A first anion selective exchange membrane (116) is arranged between the first electrode plate (150) and the first current sharing plate (170), a first cation selective exchange membrane (117) is arranged between the first current sharing plate (170) and the second current sharing plate (180), and a first anion selective exchange membrane (116) is arranged between the second current sharing plate (180) and the second electrode plate (160);

A second anion selective exchange membrane (136) is further arranged between the first electrode plate (150) and the first current-sharing plate (170), a second cation selective exchange membrane (137) is further arranged between the first current-sharing plate (170) and the second current-sharing plate (180), and a second anion selective exchange membrane (136) is further arranged between the second current-sharing plate (180) and the second electrode plate (160);

And the first electrode plate (150), the second electrode plate (160), the first current equalizing plate (170) and the second current equalizing plate (180) are provided with current equalizing structures (190), and the current equalizing structures (190) are positioned at the inlet and/or the outlet of each chamber.

9. The electro-adsorption device for separating total dissolved solids from wastewater of claim 8, wherein the flow equalizing structure (190) comprises a first flow equalizing structure (191), the first flow equalizing structure (191) is a groove structure and/or a groove-lack structure, and the first flow equalizing structure (191) at the inlet and the outlet of each chamber has a width gradually increasing from the side far from each chamber to the side near each chamber, and a depth gradually decreasing from the first flow equalizing structure (191); and/or

The flow equalizing structure (190) comprises a second flow equalizing structure (192), the second flow equalizing structure (192) is a water equalizing structure formed by a plurality of baffles (1921) arranged at intervals, a channel is formed between two adjacent baffles (1921), and the thickness of the baffles (1921) is gradually increased from two ends to the middle.

10. A wastewater treatment system comprising an electro-adsorption device according to any one of claims 1 to 9 for separating total dissolved solids from wastewater.