A sewage treatment device based on electro-sorption

Abstract

The application relates to a sewage treatment equipment based on electro-sorption, which comprises a pretreatment water tank, which comprises a first water inlet, a filtering assembly and a first water outlet; the first water inlet is arranged along a first direction, the first water outlet is arranged along a second direction, and the first direction is perpendicular to the second direction; the filtering assembly is rotatably arranged around a first axis and is arranged at the first water outlet; the filtering assembly has at least three filtering surfaces and sealing edges, and at least two sealing edges are in sealing contact with the inner wall of the pretreatment water tank; the electro-sorption water tank is in communication with the first water outlet and comprises at least two electrodes and at least two scraper mechanisms; the scraper mechanisms are retractable along the first direction and are in abutment with the surfaces of the electrodes. The sewage treatment equipment based on electro-sorption can clean the filter screen and the electrodes in real time during the process of heavy metal sewage treatment, and the sewage treatment efficiency is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of heavy metal sewage treatment, and particularly relates to a sewage treatment equipment based on electric adsorption. BACKGROUND

[0002] Heavy metal wastewater treatment refers to a process of removing heavy metals in heavy metal wastewater and recycling or harmless treatment. Heavy metal wastewater is produced in many production processes in the industries of mining, metallurgy, machinery manufacturing, chemical industry, electronics, instruments and the like. The treatment methods of heavy metal wastewater mainly include physical methods such as adsorption and membrane separation, chemical methods such as chemical precipitation and electrochemistry, and biological methods such as microbial method and plant remediation. Electrolysis is one of the common heavy metal wastewater treatment methods. Under the action of an electric field, heavy metal ions migrate directionally and undergo oxidation-reduction reaction on the surface of an electrode, so that the heavy metals are enriched and removed. Electrolysis is widely used in the industry of wastewater treatment, such as for treating heavy metal wastewater containing cyanide, and removing cyanide and heavy metals in wastewater by electrolytic oxidation to decompose cyanide and form hydroxide precipitate of heavy metals.

[0003] In the prior art, when heavy metal wastewater is treated by using electrolysis, sludge is accumulated on a filter screen, and metal compounds after electrolysis are precipitated on an electrode. In order to ensure the treatment effect of heavy metal wastewater, the filter screen and the electrode need to be cleaned in time. However, in the prior art, when the filter screen and the electrode are cleaned, the treatment equipment generally needs to be stopped and the filter screen and the electrode need to be removed, which interrupts the wastewater treatment operation, affects the wastewater treatment efficiency, and the efficiency of cleaning the filter screen and the electrode is low. SUMMARY

[0004] In view of the above analysis, the present application aims to provide a sewage treatment equipment based on electric adsorption, which can clean the filter screen and the electrode in real time during heavy metal wastewater treatment, thereby improving the wastewater treatment efficiency.

[0005] The purpose of the present application is mainly achieved by the following technical solutions:

[0006] The present application provides a sewage treatment equipment based on electric adsorption, which comprises a pretreatment water tank, comprising: a first water inlet, a filter assembly and a first water outlet; the first water inlet is arranged along a first direction, and the first water outlet is arranged along a second direction, the first direction being perpendicular to the second direction; the filter assembly is rotatably arranged about a first axis and is arranged at the first water outlet; the filter assembly has at least three filter surfaces and sealing edges, and at least two sealing edges are in sealing contact with the inner wall of the pretreatment water tank; an electric adsorption water tank is in communication with the first water outlet and comprises at least two electrodes and at least two scraper mechanisms; the scraper mechanism is retractable along the first direction and abuts against the surface of the electrode.

[0007] According to the embodiment of the present application, the filtering assembly comprises: a roller shaft hinged to the inner wall of the pretreatment water tank; a roller coaxially arranged with the roller shaft; the roller is a prism with a regular polygonal cross section; each side of the roller is provided with an opening and communicates with the first water outlet; a plurality of filter screens are arranged on each side of the roller to form a plurality of filtering surfaces; and a plurality of sealing strips are arranged on each side edge of the roller to form a plurality of sealing edges.

[0008] According to the embodiment of the present application, each side of the roller is a concave curved surface, and the axis of each curved surface is parallel to the first axis; and the sealing strips protrude relative to the filter screens.

[0009] According to the embodiment of the present application, the pretreatment water tank further comprises a cleaning operation port, and one of the sides of the roller is exposed at the cleaning operation port.

[0010] According to the embodiment of the present application, the pretreatment water tank and the electric adsorption water tank are arranged in a staggered manner along the first direction.

[0011] According to the embodiment of the present application, the electric adsorption water tank further comprises a second water inlet and a second water outlet arranged along a second direction; the second water inlet is connected with the first water inlet; and the at least two electrodes are parallel to each other, parallel to the first direction, and parallel to the second direction.

[0012] According to the embodiment of the present application, the electric adsorption water tank has an opening arranged along the first direction, and at least part of the scraper mechanism can be moved out of the electric adsorption water tank along the first direction.

[0013] According to the embodiment of the present application, the scraper mechanism comprises: a first driving assembly having a first telescopic end along a third direction; the third direction, the first direction and the second direction are perpendicular to each other in pairs; a second driving assembly connected with the first telescopic end and having a second telescopic end along the first direction; and a scraper assembly connected with the second telescopic end.

[0014] According to the embodiment of the present application, the scraper assembly comprises: a blade body extending along the second direction and inclined away from the opening direction relative to the electrode surface; and a slag tank extending along the second direction; one end of the slag tank along the third direction is connected with the blade body, and the other end is connected with the second telescopic end.

[0015] According to the embodiment of the present application, the electric adsorption water tank further comprises a water outlet filter screen arranged at the second water outlet.

[0016] Compared with the prior art, the technical scheme of the present application can at least achieve one of the following effects:

[0017] 1. The sewage treatment equipment based on electro-adsorption provided in the application, the pretreatment water tank can pretreat sewage, filter insoluble substances such as silt and sludge in the sewage, and the electro-adsorption water tank can electrolyze heavy metal pollutants in the sewage by electrolysis to adsorb them, thereby achieving the purpose of heavy metal sewage treatment.

[0018] 2. The pretreatment water tank in the embodiment of the application, the filter assembly is located at the first water outlet and can rotate, so that the sewage must pass through the filter assembly; meanwhile, the filter assembly can rotate, when the sludge on one filter surface accumulates to a certain degree, the filter assembly can be rotated to enable another filter surface to continue filtering, and the sludge accumulated on the previous filter surface is rotated away, so as to realize real-time cleaning of the sludge.

[0019] 3. The electro-adsorption water tank in the embodiment of the application, the electrolysis of heavy metal pollutants is realized by the electric field formed between the electrodes, so that heavy metal residues are deposited on the electrodes, and the scraper assembly can directly scrape the heavy metal residues on the electrodes from the electrodes, so as to realize real-time collection of the heavy metal residues.

[0020] In the application, the above technical solutions can be combined with each other to realize more preferred combination solutions. Other features and advantages of the application will be described in the subsequent description, and some advantages will become apparent from the description or be understood by implementing the application. The purposes and other advantages of the application can be realized and obtained from the contents specifically indicated in the description and the drawings. BRIEF DESCRIPTION OF DRAWINGS

[0021] The accompanying drawings are included to provide a further understanding of the embodiments and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and serve to explain the principles of the application.

[0022] Figure 1 It is a structural schematic view of the sewage treatment equipment based on electro-adsorption in the embodiment of the application.

[0023] Figure 2 It is a structural schematic view of the sewage treatment equipment based on electro-adsorption in the embodiment of the application.

[0024] Figure 3 It is a structural schematic view of the filter assembly in the embodiment of the application.

[0025] Figure 4 It is a structural schematic view of the scraper mechanism in the embodiment of the application.

[0026] Figure 5 It is a structural schematic view of the scraper assembly in the embodiment of the application.

[0027] Reference signs:

[0028] 1, pre-treatment water tank; 11, first water inlet; 12, first water outlet; 13, filter assembly; 13a, filter surface; 13b, sealing edge; 131, roller shaft; 132, roller; 133, filter screen; 134, sealing strip; 14, cleaning operation port; 15, partition plate;

[0029] 2, electro-adsorption water tank; 21, electrode; 22, scraper mechanism; 221, first driving assembly; 222, second driving assembly; 223, scraper assembly; 223a, scraper body; 223b, residue holding groove; 23, second water inlet; 24, second water outlet; 25, water outlet filter screen;

[0030] X, first direction; Y, second direction; Z, third direction. DETAILED DESCRIPTION

[0031] The preferred embodiments of the present application will be described in detail below with reference to the drawings, in which the figures present a part of the present application and are used to explain the principles of the present application together with the embodiments of the present application, but are not used to limit the scope of the present application.

[0032] In the description of the embodiments of the present application, it should be noted that unless otherwise explicitly specified and limited, the term "connected" should be understood in a broad sense, for example, it can be fixedly connected, or detachably connected, or integrally connected, which can be mechanically connected, or electrically connected, which can be directly connected, or indirectly connected through an intermediate medium. For those skilled in the art, the specific meaning of the above-mentioned term in the present application can be understood according to the specific circumstances.

[0033] The terms "top", "bottom", "above", "under" and "on" used throughout the description are relative positions of the components of the device, for example, the relative positions of the top and bottom substrates inside the device. It can be understood that the device is multifunctional, regardless of their orientation in space.

[0034] The applicant found that when treating heavy metal wastewater by electrolysis, the insoluble impurities in the wastewater are generally filtered first, and then the heavy metals are electrolyzed out. After continuously treating a certain amount of heavy metal wastewater, sludge will accumulate on the filter screen, affecting the filtering effect; heavy metal residues will accumulate on the electrode, affecting the electrolysis effect. When cleaning the filter screen and the electrode, the treatment of heavy metal wastewater needs to be temporarily suspended, the filter screen and the electrode are taken out, cleaned separately and then put back in to continue the treatment of heavy metal wastewater. Since the treatment of heavy metal wastewater needs to be temporarily suspended every time, and the filter screen and the electrode need to be taken out, the continuous treatment efficiency of heavy metal wastewater will be reduced.

[0035] In view of the above analysis, the applicant proposes a sewage treatment equipment based on electro-adsorption, comprising a pretreatment water tank and an electro-adsorption water tank. The pretreatment water tank is used to filter insoluble substances in heavy metal sewage, and the filter assembly is provided with at least three filter surfaces. When the sludge on one filter surface accumulates to a certain extent, the filter assembly can be rotated so that the new filter assembly can still be used for filtering, and the filter surface with accumulated sludge can be cleaned, thereby continuously filtering heavy metal sewage without stopping the heavy metal sewage treatment. At the same time, the electro-adsorption water tank is used to electrolyze heavy metal pollutants, and the scraper mechanism can scrape off the heavy metal residues deposited on the electrode, thereby continuously electrolyzing heavy metal sewage without stopping the heavy metal sewage treatment. Since the process of stopping heavy metal sewage treatment is omitted, the sewage treatment equipment based on electro-adsorption of the present application can improve the efficiency of continuous heavy metal sewage treatment.

[0036] Figure 1 A structural schematic diagram of the sewage treatment equipment based on electro-adsorption of the present application. Figure 2 A structural schematic diagram of the sewage treatment equipment based on electro-adsorption of the present application.

[0037] Please refer to Figure 1 and Figure 2 The present application provides a sewage treatment equipment based on electro-adsorption, comprising a pretreatment water tank 1 and an electro-adsorption water tank 2; wherein the pretreatment water tank 1 comprises a first water inlet 11, a filter assembly 13 and a first water outlet 12; the first water inlet 11 is arranged along a first direction X, and the first water outlet 12 is arranged along a second direction Y, the first direction X being perpendicular to the second direction Y; the filter assembly 13 is rotatably arranged around a first axis and is arranged at the first water outlet 12; the filter assembly 13 has at least three filter surfaces 13a and sealing edges 13b, and at least two sealing edges 13b are in sealing contact with the inner wall of the pretreatment water tank 1; the electro-adsorption water tank 2 is in communication with the first water outlet 12 and comprises at least two electrodes 21 and at least two scraper mechanisms 22; the scraper mechanism 22 is extendable along the first direction X and is in abutment with the surface of the electrode 21.

[0038] In the present application, the pretreatment water tank 1 is also provided with a partition plate 15, which divides the internal space of the pretreatment water tank 1 into an upper space and a lower space, the inner wall of the upper space comprising the inner surface of the partition plate 15 and the inner wall of the pretreatment water tank 1 above the partition plate 15; the filter assembly 13 is arranged in the upper space and at least two sealing edges 13b are in sealing contact with the inner wall of the upper space. Exemplarily, the partition plate 15 comprises an integral structure of a circular arc plate and a connecting plate, the radial section of the circular arc plate being a convex arc, and the connecting plate is obliquely connected to the inner wall of the upper space, and the filter assembly 13 is rotatably arranged in the space formed by the circular arc plate.

[0039] When the electro-adsorption-based sewage treatment device according to the embodiments of the present application is arranged on a horizontal plane, the first direction X can be a vertical direction, and the second direction Y and the third direction Z can be two horizontal directions perpendicular to each other.

[0040] In the embodiments of the present application, the pretreatment water tank 1 is used to filter the heavy metal sewage, and insoluble substances in the heavy metal sewage are filtered to form sludge accumulated on the filter assembly 13. The first water inlet 11 is arranged along the first direction X, so that the heavy metal sewage can pass through the filter assembly 13 along the first direction X. Considering that the first direction X can be a vertical direction, the filtered sludge is accumulated on the filter assembly 13.

[0041] The filter assembly 13 has at least three filter surfaces 13a, and each filter surface 13a can independently filter the heavy metal sewage. For example, the filter assembly 13 has six filter surfaces 13a, and each filter surface 13a corresponds to a central angle of 60°, and the corresponding central angle of the circular arc plate of the partition plate 15 is 240°. When the sludge accumulated on the filter surface 13a that is filtering the heavy metal sewage reaches a certain degree, it can be considered that the accumulation of the sludge will affect the normal use of the filter surface 13a. At this time, the filter assembly 13 can be rotated by a certain angle, such as 60°, and the filter surface 13a that has not accumulated sludge after rotation can continue to filter the heavy metal sewage. At the same time, considering the viscous flow characteristics of the sludge, the sludge will be rotated away with the filter assembly 13, so that the excessive sludge on the filter surface 13a can be cleaned without affecting the continuous filtration of the heavy metal sewage.

[0042] In the filter assembly 13, at least two sealing edges 13b are in sealing contact with the inner wall of the pretreatment water tank 1, which can ensure that when the filter assembly 13 is rotated, the heavy metal sewage will not directly enter the electro-adsorption water tank 2 from the gap between the filter assembly 13 and the inner wall of the pretreatment water tank 1, so that the electro-adsorption-based sewage treatment device according to the embodiments of the present application has good filtration capacity for heavy metal sewage.

[0043] In addition, the first water inlet 11 is arranged along the first direction X, and considering that the first direction X can be a vertical direction, the heavy metal sewage entering from the first water inlet 11 can pass through the filter assembly 13 with a certain impact force by means of gravitational potential energy, so that the filter assembly 13 can filter out the insoluble substances in the heavy metal sewage.

[0044] The heavy metal sewage filtered by the pretreatment water tank 1 enters the electro-adsorption water tank 2 through the first water outlet 12 and is subjected to electrolysis. The electro-adsorption water tank 2 implements the electrolysis process through the electrodes 21. At least two electrodes 21 are connected to the positive and negative electrodes respectively and are immersed in the heavy metal sewage. The heavy metal solutes in the heavy metal sewage are subjected to electrolysis and are deposited on the electrodes 21 to form heavy metal residues, thereby achieving the purpose of removing heavy metals. When the heavy metal residues on the electrodes 21 accumulate to a certain extent, it can be considered that the heavy metal residues will affect the electrolysis process. At this time, the scraper mechanism 22 scrapes off the heavy metal residues on the electrodes 21 along the first direction X and collects them, thereby cleaning the excessive heavy metal residues on the electrodes 21 without affecting the continuous electrolysis of the heavy metal sewage.

[0045] Through the rotatable filter assembly 13 in the pretreatment water tank 1 and the movable scraper mechanism 22 in the electro-adsorption water tank 2, the sewage treatment equipment based on electro-adsorption of the embodiment of the present application can clean the sludge on the filter assembly 13 and the heavy metal residues on the electrodes 21 while continuously treating the heavy metal sewage, thereby improving the treatment efficiency of the heavy metal sewage.

[0046] It should be noted that the heavy metal sewage after electrolysis still contains a certain amount of other pollutants, such as organic pollutants, and should be subjected to subsequent organic sewage treatment.

[0047] Figure 3 A structural schematic view of the filter assembly of the embodiment of the present application.

[0048] Further, please refer to Figure 3 , in combination with Figure 1 and Figure 2 , the filter assembly 13 comprises a roller shaft 131, a roller drum 132, a plurality of filter screens 133 and a plurality of sealing strips 134. The roller shaft 131 is hinged to the inner wall of the pretreatment water tank 1. The roller drum 132 is coaxially arranged with the roller shaft 131. The roller drum 132 is a prism with a regular polygonal cross section. Each side of the roller drum 132 is provided with an opening and is in communication with the first water outlet 12. The plurality of filter screens 133 are arranged on each side of the roller drum 132 to form a plurality of filter surfaces 13a. The plurality of sealing strips 134 are arranged on each side edge of the roller drum 132 to form a plurality of sealing edges 13b.

[0049] The roller 131 and the drum 132 are coaxially arranged and can synchronously rotate. The drum 132 is a prism with a regular polygon interface, and each side is provided with a filter screen 133 to form a filtering surface 13a. During the filtering of the heavy metal sewage on one of the filtering surfaces 13a, if the sludge on the filter screen 133 is too much, the drum 132 is rotated, and the filtering surface 13a corresponding to the side is opened, so that the filtering surface 13a corresponding to the next side filters the heavy metal sewage. At the same time, the filter screen 133 storing the sludge can be cleaned. It should be noted that after the drum 132 is rotated, the filter screen 133 storing the sludge is exposed relative to the side wall of the pretreatment water tank 1, so as to facilitate the cleaning of the sludge. The sealing strip 134 is located at the side edge of the drum 132 and is used for sealing between the side edge of the drum 132 and the inner wall of the pretreatment water tank 1. When the drum 132 rotates, the sealing strip 134 can prevent the heavy metal sewage from leaking out from between the side edge of the drum 132 and the inner wall of the pretreatment water tank 1, so that the filter screen 133 storing the sludge can be cleaned smoothly.

[0050] Further, referring to Figures 1 to 3 , each side of the drum 132 is a concave curved surface, and the axis of each curved surface is parallel to the first axis; and the sealing strip 134 protrudes relative to the filter screen 133.

[0051] The sludge has certain viscous flow characteristics, and when the drum 132 rotates, the sludge can still fall off the filter screen 133. The side of the drum 132 is formed as a concave curved surface, and the sealing strip 134 protrudes relative to the filter screen 133, so that the filtering surface 13a is also formed as a concave curved surface, thereby increasing the contact area of the sludge and reducing the possibility of sludge falling off. In addition, the concave filtering surface 13a can also store more sludge, reducing the frequency of rotation of the drum 132.

[0052] Further, referring to Figures 1 to 3 , the pretreatment water tank 1 further comprises a cleaning operation port 14, one side of the drum 132 is exposed at the cleaning operation port 14, and the cleaning operation port 14 is used for cleaning the sludge on the filter screen 133. Among them, the cleaning operation port 14 can be directly exposed to the outside of the pretreatment water tank 1; or the cleaning operation port 14 is provided with a door that can be opened and closed, and the door is opened when cleaning is needed and closed when cleaning is not needed.

[0053] The filter screen 133, which has accumulated sludge after the rotation of the roller 132, can be moved to the cleaning operation opening 14, and the sludge on the filter screen 133 can be cleaned manually or automatically. For example, the sludge can be sucked from the filter screen 133 by a suction device, considering that the sludge has a certain viscous flow characteristic. During the cleaning of the filter screen 133, the sealing rib 13b can prevent the heavy metal sewage from leaking from the side rib of the roller 132 to the cleaning operation opening 14 at the side wall of the pretreatment water tank 1, so as to ensure the smooth cleaning of the filter screen 133.

[0054] Further referring to Figures 1 to 2 , the pretreatment water tank 1 and the electric adsorption water tank 2 are arranged in the first direction X.

[0055] Considering that the first direction X can be a vertical direction, the pretreatment water tank 1 is arranged at a high position, and the electric adsorption water tank 2 is arranged at a low position, so that the filtered heavy metal sewage can enter the electric adsorption water tank 2 by using the gravitational potential energy of the heavy metal sewage.

[0056] Further referring to Figures 1 to 2 , the electric adsorption water tank 2 further comprises a second water inlet 23 and a second water outlet 24 arranged in a second direction Y; the second water inlet 23 is connected with the first water outlet 12; the at least two electrodes 21 are parallel to each other, parallel to the first direction X, and parallel to the second direction Y.

[0057] The second water inlet 23 and the second water outlet 24 are arranged in the second direction Y, so that the heavy metal sewage in the electric adsorption water tank 2 flows in the second direction Y. The two electrodes 21 are parallel to each other, forming a parallel plate electric field, and are parallel to the first direction X and the second direction Y, that is, the two electrodes 21 form a parallel plate electric field in the third direction Z. The heavy metal sewage flowing in the second direction Y directly flows through the two electrodes 21, is electrolyzed under the action of the electric field, and is deposited on the electrodes 21 to form heavy metal residues.

[0058] Further referring to Figures 1 to 2 , the electric adsorption water tank 2 has an opening arranged in the first direction X, and at least part of the scraper mechanism 22 can be moved out of the electric adsorption water tank 2 in the first direction X.

[0059] When the heavy metal residues deposited on the electrodes 21 are too much, the heavy metal residues on the electrodes 21 are scraped off by the scraper mechanism 22 and collected. The scraper mechanism 22 collecting the heavy metal residues continues to move in the first direction X and moves out of the water surface of the heavy metal sewage on the electric adsorption water tank 2, and at this time, the heavy metal residues on the scraper mechanism 22 can be cleaned manually or automatically.

[0060] Figure 4 It is a structural schematic view of the scraper mechanism of the embodiment of the present application.

[0061] Further, referring to Figure 4 The scraper mechanism 22 comprises a first driving assembly 221, a second driving assembly 222 and a scraper assembly 223. The first driving assembly 221 has a first telescopic end along a third direction Z. The third direction Z, the first direction X and the second direction Y are perpendicular to each other. The second driving assembly 222 is connected with the first telescopic end and has a second telescopic end along the first direction X. The scraper assembly 223 is connected with the second telescopic end.

[0062] The first driving assembly 221 has a first telescopic end along the third direction Z, and the second driving assembly 222 is connected with the first telescopic end. The first driving assembly 221 drives the second driving assembly 222 and the scraper assembly 223 along the third direction Z, so that the scraper assembly 223 can approach or move away from the electrode 21. Exemplarily, the first driving assembly 221 can be a telescopic cylinder. The scraper assembly 223 is connected with the second telescopic end. The second driving assembly 222 drives the scraper assembly 223 along the first direction X, so that the scraper assembly 223 can implement the action of scraping off heavy metal residues. Exemplarily, the second driving assembly 222 can adopt the form of a sliding rail and a sliding block.

[0063] When scraping off the heavy metal residues on the electrode 21, the first driving assembly 221 makes the second driving assembly 222 approach the electrode 21, and makes the scraper assembly 223 abut against the electrode 21. The second driving assembly 222 drives the scraper assembly 223 to move along the first direction X, so as to scrape off the heavy metal residues on the electrode 21. The scraper assembly 223 continues to move along the first direction X and moves out of the opening of the electric adsorption water tank 2, so as to clean the heavy metal residues scraped off on the scraper.

[0064] Figure 5 A structural schematic view of the scraper assembly of the embodiment of the present application.

[0065] Further, referring to Figure 5 The scraper assembly 223 comprises a blade body 223a and a residue containing groove 223b. The blade body 223a extends along the second direction Y and is inclined away from the opening direction relative to the surface of the electrode 21. The residue containing groove 223b extends along the second direction Y. One end of the residue containing groove 223b along the third direction Z is connected with the blade body 223a, and the other end is connected with the second telescopic end.

[0066] The scraper assembly 223 is moved along the first direction X to scrape the heavy metal residues on the electrode 21. The conductor of the scraper assembly 223 extends along the second direction Y and is inclined away from the opening direction relative to the surface of the electrode 21. When the scraper assembly 223 is moved, the blade body 223a can shovel the heavy metal residues on the surface of the electrode 21 to ensure that the heavy metal residues can be scraped smoothly. The residue collecting groove 223b is used to collect the scraped heavy metal residues. The residue collecting groove 223b is connected to the blade body 223a at one end along the third direction Z and connected to the second telescopic end at the other end. The heavy metal residues shovelled by the conductor will slide into the residue collecting groove 223b along the inclined direction of the blade body 223a. When the scraper assembly 223 is moved out of the opening of the electro-adsorption water tank 2, only the heavy metal residues in the residue collecting groove 223b need to be cleaned.

[0067] It should be noted that after the heavy metal residues in the residue collecting groove 223b are cleaned, the heavy metal residues can be recycled to recover heavy metals from the heavy metal residues.

[0068] Further, referring to Figure 1 and Figure 2 , the electro-adsorption water tank 2 further comprises a water outlet filter screen 25 located at the second water outlet 24.

[0069] Considering that the heavy metal residues can be washed off from the electrode 21 by the flow of heavy metal sewage, the water outlet filter screen 25 can be arranged at the second water outlet 24 to ensure that the water flowing out of the second water outlet 24 contains almost no insoluble substances. At this time, the sewage obtained can still contain organic pollutants, which need to be further purified.

[0070] In summary, the embodiment of the present application provides a sewage treatment equipment based on electro-adsorption. The pre-treatment water tank can pre-treat the sewage to filter the insoluble substances such as silt and sludge in the sewage. The electro-adsorption water tank can electrolyze the heavy metal pollutants in the sewage by electrolysis to adsorb them to achieve the purpose of heavy metal sewage treatment. In the pre-treatment water tank, the filter assembly is located at the first water outlet and can rotate to ensure that the sewage passes through the filter assembly. Meanwhile, the filter assembly can rotate, and when the sludge on one filter surface accumulates to a certain extent, the filter assembly can be rotated to enable the other filter surface to continue filtering, and the sludge accumulated on the previous filter surface is rotated away to facilitate real-time cleaning of the sludge. In the electro-adsorption water tank, the electric field formed between the electrodes is used to electrolyze the heavy metal pollutants to make the heavy metal residues precipitate on the electrodes. Meanwhile, the scraper assembly can directly scrape the heavy metal residues on the electrodes to facilitate real-time collection of the heavy metal residues.

[0071] The above merely provides the preferred embodiments of the present application, and the protection scope of the present application is not limited thereto, and any changes or substitutions easily conceived by those skilled in the art within the technical scope disclosed by the present application shall be covered within the protection scope of the present application.

Claims

1. An electric adsorption-based sewage treatment apparatus, characterized by comprising: The utility model relates to a water purifier, comprising: a pre-treatment water tank comprising a first water inlet, a filter assembly and a first water outlet; the first water inlet is arranged along a first direction, the first water outlet is arranged along a second direction, the first direction is perpendicular to the second direction; the filter assembly is rotatably arranged around a first axis and is arranged at the first water outlet; the filter assembly has at least three filter surfaces and sealing edges, at least two of the sealing edges are in sealing contact with the inner wall of the pre-treatment water tank; the filter assembly comprises: a roller shaft hinged to the inner wall of the pre-treatment water tank; a roller drum coaxially arranged with the roller shaft; the roller drum is a prism with a regular polygonal cross section; each side surface of the roller drum is provided with an opening and is in communication with the first water outlet; a plurality of filter screens are located on each side surface of the roller drum to form a plurality of filter surfaces; a plurality of sealing strips are located on each side edge of the roller drum to form a plurality of sealing edges; each side surface of the roller drum is a concave curved surface, and the axis of each curved surface is parallel to the first axis; the sealing strips protrude relative to the filter screens; an electro-adsorption water tank in communication with the first water outlet, comprising at least two electrodes and at least two scraper mechanisms; the scraper mechanisms are retractable along the first direction and abut against the surface of the electrodes.

2. The electro-adsorption based sewage treatment apparatus according to claim 1, characterized by, The pre-treatment water tank further comprises a cleaning operation port, one of the side surfaces of the roller drum is exposed at the cleaning operation port.

3. The electro-adsorption based sewage treatment apparatus according to claim 1, wherein The pre-treatment water tank and the electro-adsorption water tank are arranged in a staggered manner along the first direction.

4. The electro-adsorption based sewage treatment apparatus according to claim 1, wherein The electro-adsorption water tank further comprises a second water inlet and a second water outlet arranged along the second direction; the second water inlet is connected to the first water outlet; the at least two electrodes are parallel to each other, parallel to the first direction and parallel to the second direction.

5. The electro-adsorption based sewage treatment apparatus according to claim 4, wherein The electro-adsorption water tank has an opening arranged along the first direction, and at least part of the scraper mechanisms can move out of the electro-adsorption water tank along the first direction.

6. The electro-adsorption based sewage treatment apparatus according to claim 5, wherein The scraper mechanism comprises: a first driving assembly having a first retractable end along a third direction; the third direction, the first direction and the second direction are perpendicular to each other in pairs; a second driving assembly connected to the first retractable end and having a second retractable end along the first direction; a scraper assembly connected to the second retractable end.

7. The electro-adsorption based sewage treatment apparatus according to claim 6, wherein The scraper assembly comprises: a blade body extending along the second direction; a slag holding groove extending along the second direction; one end of the slag holding groove along the third direction is connected to the blade body, and the other end is connected to the second retractable end.

8. The electro-adsorption based sewage treatment apparatus as claimed in claim 4, wherein, The electro-adsorption water tank further comprises a water outlet filter screen located at the second water outlet.

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