A heavy metal wastewater treatment equipment and a porous graphene-based sewage purification method

Abstract

The application discloses a heavy metal wastewater treatment equipment and a sewage purification method based on porous graphene, relates to the technical field of heavy metal wastewater treatment, and comprises a bottom plate, a wastewater treatment box fixedly arranged above the bottom plate, characterized in that a bearing table is rotationally arranged below the wastewater treatment box, a plurality of filter mechanisms are annularly installed on the bearing table and can rotate along with the bearing table, the filter mechanism comprises an arc-shaped filter plate, an installation table is fixedly arranged above the bottom plate, a cleaning mechanism is arranged on the installation table, the cleaning mechanism comprises a scraper and a guide column body, the scraper can move along with the guide column body, and the operation track of the scraper is adapted to the shape of the arc-shaped filter plate.

Description

Technical Field

[0001] The present invention relates to the technical field of heavy metal wastewater treatment, and in particular to heavy metal wastewater treatment equipment and a wastewater purification method based on porous graphene. Background Art

[0002] Heavy metal wastewater mainly comes from mining, metal smelting, electroplating, leather making, chemical industry, printing and dyeing and other industries. These wastewaters contain various heavy metal ions such as lead, mercury, cadmium, and chromium. These ions cannot be naturally degraded and are easily absorbed and enriched by organisms. Their toxicity is persistent and poses a serious threat to the ecosystem and human health. In order to meet the treatment needs of heavy metal wastewater, existing heavy metal wastewater treatment technologies are mainly divided into three categories: physical, chemical and biological methods.

[0003] Chinese patent CN220887161U discloses a heavy metal wastewater treatment unit: when the heavy metal wastewater and the reactant are fully reacted, the second forward and reverse motor is started by an external controller to drive the third transmission shaft and the connecting plate to rotate while driving the sealing gasket to move, so that the water and sediment reacted by the heavy metal wastewater and the reactant in the mixing barrel enter the top of the filter structure through the pouring port, and then the sediment is filtered through the filter plate. When the filter plate is replaced and cleaned, the filter plate needs to be taken out, the two clamping plates are rotated, and the top of the clamping plate is rotated from the clamping groove inside the two fixed blocks to the bottom of the two fixed rods. The filter plate is pulled out or inserted into the movable groove by holding the handle, which can facilitate the removal and installation of the filter plate during replacement and cleaning, and also avoids the impact of a lot of time required for dismantling and installation when replacing and cleaning the filter plate.

[0004] The above patents and prior art also have the following defects: when a large amount of heavy metal wastewater is injected into the mixing container, the mixing drum needs to maintain a long-term continuous operation state, which means that the filter plate also needs to perform the filtering function for a long time. The existing filter plate must be disassembled and cleaned after completing the entire filtering task. This means that during the filtering operation, the filter plate cannot be replaced and must withstand long-term continuous use. However, long-term uninterrupted use can easily lead to blockage inside the filter plate, thereby affecting its filtering performance; and the prior art requires the filter plate to be disassembled before it can be cleaned. Disassembling the filter plate for cleaning requires the mixing drum to be shut down, which not only affects production efficiency, but may also cause delays in production progress due to excessive downtime.

[0005] Therefore, the present application provides a heavy metal wastewater treatment equipment and a wastewater purification method based on porous graphene to meet the needs. Summary of the Invention

[0006] The purpose of this application is to provide a heavy metal wastewater treatment equipment and a wastewater purification method based on porous graphene, which solves the problem that the existing filter plate must be disassembled and cleaned only after completing the entire filtration task. During the filtration operation, the filter plate cannot be replaced and must withstand long-term continuous use.

[0007] To solve the above problems, the present application provides the following technical solutions: a heavy metal wastewater treatment equipment, a heavy metal wastewater treatment equipment, comprising: a base plate, a wastewater treatment box fixedly arranged above the base plate, characterized in that: a supporting platform is rotatably arranged below the wastewater treatment box, a plurality of filtering mechanisms are installed in a ring shape on the supporting platform, and the plurality of filtering mechanisms can rotate with the supporting platform, the filtering mechanism includes an arc-shaped filter plate, a mounting platform is fixedly arranged above the base plate, a cleaning mechanism is arranged on the mounting platform, the cleaning mechanism includes a scraper and a guide column, the scraper can follow the movement of the guide column, the running trajectory of the scraper is adapted to the shape of the arc-shaped filter plate, the filtering mechanism can be lifted, two sediment receiving mechanisms are symmetrically arranged below the mounting platform, and a cleaning mechanism is arranged at the bottom of the mounting platform.

[0008] Preferably, a fixed platform is fixedly provided on the top of the base plate, the fixed platform is annular, and an installation opening is provided on the fixed platform corresponding to the position of the holding box, the installation opening of the fixed platform is used to install the holding box, and a bearing platform is rotatably connected to the top of the fixed platform, the bearing platform includes an inner bearing ring and an outer bearing ring rotatably connected to the top of the fixed platform, the fixed platform, the inner bearing ring and the outer bearing ring are all coaxially arranged, and the inner bearing ring is on the inner side of the outer bearing ring, a plurality of connecting rods are fixedly connected between the inner bearing ring and the outer bearing ring, and there is a distance between the inner bearing ring and the outer bearing ring, the outer ring of the outer bearing ring is fixedly connected to a gear ring, a driving motor is fixedly provided on the top of the base plate, the output end of the driving motor is fixedly connected to a driving gear, the driving gear is meshed with the gear ring, an annular mounting groove is provided on the top of the bearing platform, and a plurality of filtering mechanisms are installed in the annular mounting groove of the bearing platform.

[0009] Preferably, there are multiple filter holes on the arc filter plate, and the side of the arc filter plate away from the inner bearing ring is fixedly connected to an outer arc plate, and two outer connecting rods are symmetrically fixedly connected to the outer arc plate. The side of the arc filter plate close to the inner bearing ring is fixedly connected to an inner arc plate, and two inner connecting rods are symmetrically fixedly connected to the inner arc plate. The bottom surface of the outer arc plate slides with the top surface of the outer bearing ring, and the bottom surface of the inner arc plate slides with the top surface of the inner bearing ring.

[0010] Preferably, the bottom of the mounting platform is symmetrically fixedly connected to two support rods, the bottom of the support rod is fixedly connected to the bottom plate, and the cleaning mechanism can clean the filter mechanism, the cleaning mechanism includes an arc guide rail fixedly connected to the bottom of the mounting platform, the outer side of the arc guide rail is slidably connected to the arc rack, a servo motor is fixedly provided on the top of the mounting platform, the output end of the servo motor passes through the mounting platform and is fixedly connected to a matching gear, the matching gear is meshed with the arc rack, the side of the arc rack is fixedly connected to an extension block, the interior of the extension block is slidably connected to a movable column, and the movable column passes through the extension block, the bottom of the movable column is fixedly connected to a scraper, the scraper is adapted to the arc filter plate, an arc displacement opening is opened on the mounting platform, the shape of the arc displacement opening is adapted to the movement trajectory of the movable column, the movable column passes through the arc displacement opening, the outer side of the movable column and the position above the mounting platform is fixedly connected to the guide column, and the guide column is vertically arranged to the movable column.

[0011] Preferably, four electric push rods are provided under the mounting platform, and the fixed ends of the electric push rods are fixedly provided on the top of the base plate. The positions of the four electric push rods correspond to the positions of the two outer connecting rods and the two inner connecting rods respectively, and the bottoms of the two outer connecting rods and the two inner connecting rods are provided with docking grooves.

[0012] Preferably, the sediment receiving mechanism includes a carrying plate, and two extension plates are symmetrically fixedly connected to the side of the carrying plate. The sediment receiving mechanism also includes two electric telescopic rods fixedly arranged on the top of the base plate, and the telescopic ends of the electric telescopic rods are fixedly connected to the corresponding extension plates. A receiving box is installed on the top of the carrying plate, and a receiving groove for adapting to the receiving box is provided on the top of the carrying plate. The bottom of the receiving box is installed in the receiving groove of the carrying plate, and the sides of the two receiving boxes close to each other are provided with notches, and the notches are used for the passage of the scraper.

[0013] The lifting mechanism is a kind of top driving mechanism, and its top is to be positioned at the top of lifting up and down of supporting ram, and support ... and support and and support and and support and and and support and and support and and and support and and and support and and support and and and support and and and support and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and and

[0014] Preferably, the cleaning mechanism is located inside one of the receiving boxes, and the cleaning mechanism includes a cleaning box fixedly arranged under the mounting platform, a fixing rod fixedly connected between the cleaning box and the mounting platform, a plurality of nozzles are installed on the side of the cleaning box close to the scraper, and the nozzles are arranged inclined toward the bottom of the scraper, and a water inlet pipe is fixedly arranged on the mounting platform, and the water inlet pipe is connected to the cleaning box.

[0015] Preferably, L-shaped brackets are fixedly connected to both sides of the wastewater treatment box, the bottom of the L-shaped bracket is fixedly connected to the bottom plate, and a storage box is fixedly provided on the top of the bottom plate and below the wastewater treatment box.

[0016] The method for purifying wastewater based on porous graphene comprises the following steps:

[0017] S1. Before pouring the heavy metal wastewater and the reactant into the wastewater treatment tank, a certain amount of porous graphene is added to the wastewater to pre-mix the porous graphene with the wastewater;

[0018] S2. Pour the pretreated wastewater and the reactant into the wastewater treatment tank to react. The porous graphene can adsorb heavy metal ions in the wastewater to form precipitates.

[0019] In summary, the technical effects and advantages of the present invention are as follows:

[0020] 1. In the present invention, multiple filtering mechanisms are designed in the equipment. The multiple filtering mechanisms are installed in a ring shape on the supporting platform and can rotate with the supporting platform. During the wastewater treatment process, different filtering mechanisms can be in working state in turn. When one filtering mechanism is in use, the other filtering mechanisms are in standby or cleaning state, so that each filtering mechanism has enough rest time for cleaning and maintenance, thereby avoiding the decrease in filtering efficiency caused by long-term continuous use.

[0021] 2. In the present invention, the equipment is equipped with a cleaning mechanism, which can automatically clean the filter mechanism. The scraper in the cleaning mechanism can move along the shape of the curved filter plate to scrape off the sediment. After cleaning is completed, the lifting return mechanism can lift the scraper and its related components and return them to the initial position, which can prevent the contaminated scraper from contacting the curved filter plate again. After the sediment on the scraper is rinsed clean, the scraper scrapes off the remaining sediment on the curved filter plate again. In this way, the sediment on the curved filter plate is cleaned up without the need to disassemble the filter mechanism for cleaning.

[0022] 3. In the present invention, a sediment receiving mechanism is designed in the equipment, including a carrying plate, a receiving box and other components, which can receive the sediment scraped off by the scraper. The receiving box can be easily removed, cleaned and reinstalled. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0024] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0025] Figure 2 A structural diagram of another perspective of the present invention;

[0026] Figure 3 It is a structural schematic diagram of the supporting platform and the fixing platform of the present invention;

[0027] Figure 4 It is a structural schematic diagram of the filtering mechanism of the present invention;

[0028] Figure 5 This is a schematic diagram of the bottom structure of the mounting platform of the present invention;

[0029] Figure 6 For the present invention Figure 5 A schematic diagram of the enlarged structure of part A;

[0030] Figure 7 This is a schematic diagram of the top structure of the mounting platform of the present invention;

[0031] Figure 8 For the present invention Figure 7 The enlarged structural diagram of part B in the middle;

[0032] Figure 9 It is a structural schematic diagram of the sediment receiving mechanism of the present invention.

[0033] In the figure: 1. bottom plate; 2. wastewater treatment box; 3. L-shaped bracket; 4. holding box; 5. fixing platform; 6. bearing platform; 61. inner bearing ring; 62. outer bearing ring; 621. gear ring; 63. connecting rod; 7. driving motor; 8. driving gear; 9. filtering mechanism; 91. arc filter plate; 92. filtering hole; 93. outer arc plate; 931. outer connecting rod; 94. inner arc plate; 941. inner connecting rod; 10. mounting platform; 101. arc displacement port; 11. supporting rod; 12. cleaning mechanism; 121. arc guide rail; 122. arc rack; 123. matching gear ; 124. Servo motor; 125. Extension block; 126. Movable column; 127. Scraper; 128. Guide column; 13. Cleaning mechanism; 131. Cleaning box; 132. Nozzle; 133. Water inlet pipe; 134. Fixed rod; 14. Lifting return mechanism; 141. Arc plate; 142. Upward section; 143. Downward section; 144. Ascending section; 145. Closing block; 146. Spring; 147. Fixed block; 15. Sediment receiving mechanism; 151. Receiving box; 152. Loading plate; 153. Extension plate; 154. Electric telescopic rod; 16. Electric push rod. DETAILED DESCRIPTION

[0034] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0035] Example: Reference Figures 1-9 The heavy metal wastewater treatment equipment shown in the figure includes: a base plate 1, a wastewater treatment tank 2 is fixedly arranged above the base plate 1, L-shaped brackets 3 are fixedly connected to both sides of the wastewater treatment tank 2, the bottom of the L-shaped bracket 3 is fixedly connected to the base plate 1, and the two L-shaped brackets 3 are used to support the wastewater treatment tank 2. The side of the wastewater treatment tank 2 is connected to a liquid inlet pipe (not shown in the figure), and a stirring mechanism is provided inside the wastewater treatment tank 2 (not shown in the figure). A liquid outlet pipe is provided at the bottom of the wastewater treatment tank 2, and a holding box 4 is fixedly provided at the top of the base plate 1 and below the wastewater treatment tank 2.

[0036] The stirring mechanism includes a stirring motor fixedly mounted on the top of the wastewater treatment tank 2, an output end of the stirring motor passing through the top of the wastewater treatment tank 2 and extending into the interior of the wastewater treatment tank 2, a fixed shaft fixedly connected to the output end of the stirring motor, the fixed shaft being located inside the wastewater treatment tank 2, and a plurality of stirring rods fixedly connected to the outside of the fixed shaft, the plurality of stirring rods being vertically distributed. Heavy metal wastewater and reactants are poured into the interior of the wastewater treatment tank 2 through a liquid inlet pipe on the side of the wastewater treatment tank 2, and the stirring motor is started. The output end of the stirring motor drives the fixed shaft to rotate, and the fixed shaft drives the plurality of stirring rods to rotate, thereby allowing the heavy metal wastewater to fully contact the reactants and accelerating the reaction rate, causing the heavy metal wastewater and the reactants to react and generate a precipitate.

[0037] A fixed platform 5 is fixedly provided on the top of the bottom plate 1. The fixed platform 5 is annular, and an installation port is opened on the fixed platform 5 corresponding to the position of the holding box 4. The installation port of the fixed platform 5 is used to install the holding box 4. The top of the fixed platform 5 is rotatably connected to a bearing platform 6. The bearing platform 6 includes an inner bearing ring 61 and an outer bearing ring 62 rotatably connected to the top of the fixed platform 5. The fixed platform 5, the inner bearing ring 61, and the outer bearing ring 62 are all coaxially arranged, and the inner bearing ring 61 is on the inner side of the outer bearing ring 62. A plurality of connecting rods 63 are fixedly connected between the inner bearing ring 61 and the outer bearing ring 62. There is a spacing between the inner bearing ring 61 and the outer bearing ring 62, and the connecting rods 63 make the inner bearing ring 6 1 forms a whole with the outer carrying ring 62 and can rotate simultaneously. The outer ring of the outer carrying ring 62 is fixedly connected to the gear ring 621. The top of the base plate 1 is fixedly provided with a driving motor 7. The output end of the driving motor 7 is fixedly connected to the driving gear 8. The driving gear 8 is meshed with the gear ring 621. A plurality of filtering mechanisms 9 are annularly installed on the carrying platform 6, and the plurality of filtering mechanisms 9 can rotate with the carrying platform 6. The top of the carrying platform 6 (referring to the combined structure of the inner carrying ring 61 and the outer carrying ring 62) is provided with an annular mounting groove. The plurality of filtering mechanisms 9 are installed in the annular mounting groove of the carrying platform 6. The carrying platform 6 is arranged below the wastewater treatment tank 2.

[0038] The filtering mechanism 9 includes an arc-shaped filter plate 91, which starts with a plurality of filter holes 92. The side of the arc-shaped filter plate 91 away from the inner load-bearing ring 61 is fixedly connected to an outer arc-shaped plate 93, and two outer connecting rods 931 are symmetrically fixedly connected to the outer arc-shaped plate 93. The side of the arc-shaped filter plate 91 close to the inner load-bearing ring 61 is fixedly connected to an inner arc-shaped plate 94, and two inner connecting rods 941 are symmetrically fixedly connected to the inner arc-shaped plate 94. The bottom surface of the outer arc-shaped plate 93 slides with the top surface of the outer load-bearing ring 62 (the sliding fit trajectory is circular), and the bottom surface of the inner arc-shaped plate 94 slides with the top surface of the inner load-bearing ring 61 (the sliding fit trajectory is circular).

[0039] Open the valve of the liquid outlet pipe of the wastewater treatment tank 2, and the water and sediment produced by the reaction of heavy metal wastewater and reactant fall into one of the filter mechanisms 9 under the action of gravity, and the sediment is retained on this filter mechanism 9. The water passes through the filter mechanism 9 and the gap between the inner carrier ring 61 and the outer carrier ring 62 in turn and enters the interior of the holding box 4. When the wastewater treatment tank 2 is in a state of continuous operation for a long time, one of the filter mechanisms 9 is used for a long time. In order to avoid the decline of the filtering function of the filter mechanism 9 under long-term use, it is necessary to start the drive motor 7. The output end of the drive motor 7 drives the drive gear 8 to rotate, and the drive gear 8 drives the gear ring 621 to rotate. The gear ring 621 drives the carrier platform 6 and multiple filter mechanisms 9 to rotate until the next unused filter mechanism 9 rotates to the liquid outlet pipe position corresponding to the wastewater treatment tank 2 to continue filtering the sediment. The used filter mechanism 9 rotates to the cleaning position and is cleaned, and then continues to be put into use after cleaning.

[0040] The filter mechanism 9 that has been used for a long time is prone to clogging, resulting in a decrease in filtering efficiency. By rotating the use of multiple filter mechanisms 9, it can be ensured that each filter mechanism 9 has enough rest time for cleaning and maintenance, thereby maintaining its filtering efficiency; the filter mechanism 9 that has been used can also be cleaned without interrupting the processing flow, and there is no need to stop the machine to clean the filter mechanism 9 that has been used.

[0041] A mounting platform 10 is fixedly provided above the base plate 1, and two support rods 11 are symmetrically fixedly connected to the bottom of the mounting platform 10. The bottom of the support rod 11 is fixedly connected to the base plate 1. A cleaning mechanism 12 is provided on the mounting platform 10. The cleaning mechanism 12 can clean the filter mechanism 9. The cleaning mechanism 12 includes an arc-shaped guide rail 121 fixedly connected to the bottom of the mounting platform 10, and an arc-shaped rack 122 is slidably connected to the outer side of the arc-shaped guide rail 121. A servo motor 124 is fixedly provided on the top of the mounting platform 10. The servo motor 124 is fixedly provided on the top of the mounting platform 10. The output end of the servo motor 124 passes through the mounting platform 10 and is fixedly connected to a matching gear 123. The matching gear 123 is meshed with the arc-shaped rack 122. The side of the arc-shaped rack 122 is fixedly connected to an extension block 125. The interior of the extension block 125 is slidably connected to a movable column 126, and the movable column 126 passes through the extension block 125. The bottom of the movable column 126 is fixedly connected to a scraper 127. The scraper 127 is adapted to the arc-shaped filter plate 91, and the running track of the scraper 127 is consistent with the arc-shaped filter plate 91. The shape of the scraper 127 is adapted to the shape of the curved filter plate 91, and the scraper 127 is used to scrape off the sediment on the curved filter plate 91. The mounting platform 10 is provided with an arc-shaped displacement port 101. The shape of the arc-shaped displacement port 101 is adapted to the movement trajectory of the movable column 126. The movable column 126 passes through the arc-shaped displacement port 101. The outer side of the movable column 126 and the position above the mounting platform 10 are fixedly connected with a guide column 128. The guide column 128 is vertically arranged with the movable column 126. The guide column 128 and the movable column 126 are integrally arranged in the water. The scraper 127 moves in a horizontal direction along the arc-shaped displacement port 101. After the scraper 127 scrapes the sediment on the arc-shaped filter plate 91, the guide column 128, the movable column 126, and the scraper 127 can be lifted as a whole and return to the initial position (to prevent the contaminated scraper 127 from contacting the arc-shaped filter plate 91 again). After the sediment on the scraper 127 is rinsed clean, the scraper 127 scrapes the remaining sediment on the arc-shaped filter plate 91 again. In this way, the sediment on the arc-shaped filter plate 91 is cleaned.

[0042] Four electric push rods 16 are provided below the mounting platform 10. The fixed ends of the electric push rods 16 are fixed to the top of the base plate 1. The positions of the four electric push rods 16 correspond to the positions of the two outer engagement rods 931 and the two inner engagement rods 941, respectively. The bottoms of the two outer engagement rods 931 and the two inner engagement rods 941 are each provided with a docking groove. When preparing to clean the sediment on the filter mechanism 9, the drive motor 7 is stopped when the filter mechanism 9 to be cleaned rotates to the position corresponding to the electric push rod 16. The electric push rod 16 is then started, causing the telescopic end of the electric push rod 16 to rise. The telescopic end of the electric push rod 16 then enters the corresponding docking groove and continues to rise. The outer engagement rods 931 and the inner engagement rods 941 lift the curved filter plate 91 to the height corresponding to the scraper 127, allowing the scraper 127 to abut against the curved filter plate 91 during rotation.

[0043] Two sediment receiving mechanisms 15 are symmetrically arranged below the mounting platform 10. The sediment receiving mechanism 15 includes a carrying plate 152. Two extension plates 153 are symmetrically fixedly connected to the side surfaces of the carrying plate 152. The sediment receiving mechanism 15 also includes two electric telescopic rods 154 fixedly arranged on the top of the base plate 1. The telescopic ends of the electric telescopic rods 154 are fixedly connected to the corresponding extension plates 153. A receiving box 151 is installed on the top of the carrying plate 152. A receiving groove for adapting to the receiving box 151 is provided on the top of the carrying plate 152. The bottom of the receiving box 151 is installed in the receiving groove of the carrying plate 152. Notches are provided on the sides of the two receiving boxes 151 that are close to each other. The notches are used for the passage of the scraper 127. The telescopic end of the electric telescopic rod 154 is in an extended state in the initial state. When the curved filter plate 91 is lifted to the height position corresponding to the scraper 127, the top surfaces of the outer curved plate 93 and the inner curved plate 94 are flush with the top surface of the receiving box 151, and there is no gap between the receiving box 151 and the curved filter plate 91. The scraper 127 can enter the interior of the receiving box 151 from the top of the curved filter plate 91.

[0044] When the filter mechanism 9 is ready to be cleaned, the filter mechanism 9 that needs to be cleaned rotates to the position of the corresponding electric push rod 16, and the driving motor 7 is stopped. The electric push rod 16 is used to lift the curved filter plate 91 to the height position of the corresponding scraper 127, and the top surfaces of the outer curved plate 93 and the inner curved plate 94 are flush with the top surface of the receiving box 151, and there is no gap between the receiving box 151 and the curved filter plate 91. In the initial state, the scraper 127 is inside one of the receiving boxes 151, and the servo motor 124 is started. The output end of the servo motor 124 drives the matching gear 123 to rotate, and the matching gear 123 drives the arc rack 122 and the extension block 125 to rotate as a whole. The extension block 125 drives the guide column 128, the movable column 126, and the scraper 127 to rotate as a whole. The movable column 126 runs along the trajectory of the arc displacement port 101, and the scraper 127 enters the raised arc path from the inside of one of the receiving boxes 151. The top of the filter plate 91 is cleaned, and as the scraper 127 moves, the scraper 127 scrapes the sediment on the top of the curved filter plate 91 until the scraper 127 enters the interior of another receiving box 151, and the scraper 127 pushes the sediment into the interior of this receiving box 151. Then the guide column 128, the movable column 126, and the scraper 127 are lifted as a whole and return to the initial position, and then the sediment adhering to the scraper 127 is washed away, and the scraper 127 scrapes the residual sediment on the curved filter plate 91 again. In this way, until the sediment on the curved filter plate 91 is cleaned, the electric push rod 16 is started, the telescopic end of the electric push rod 16 is shortened, and the telescopic end of the electric push rod 16 drives the corresponding outer connecting rod 931 and the inner connecting rod 941 to descend, and then the corresponding curved filter plate 91 is lowered until the corresponding curved filter plate 91 is reinstalled in the annular mounting groove of the supporting platform 6, and this curved filter plate 91 is ready to be used again.

[0045] A lifting and returning mechanism 14 is provided on the top of the mounting platform 10. The lifting and returning mechanism 14 can lift the guide column 128, the movable column 126, and the scraper 127 as a whole and return them to the initial position. The lifting and returning mechanism 14 includes an arc-shaped plate 141 fixedly connected to the top of the mounting platform 10. A track groove is provided on the side of the arc-shaped plate 141 near the guide column 128. The end of the guide column 128 is cooperated and arranged inside the track groove. The track groove includes an upward section 142, a downward section 143, a descending section, and an upward section 144. One end of the upward section 142 is connected to one end of the downward section 143 through the descending section. The descending section is inclined downward starting from the upward section 142. The other end of the ascending section 142 is connected to the descending section 143 through the ascending section 144. The ascending section 144 is inclined upward starting from near the descending section 143. A closing block 145 is provided at the connection between the ascending section 142 and the ascending section 144. The end of the closing block 145 is inclined. A vertical fixed block 147 is fixedly connected to the top of the mounting platform 10. A rectangular opening is opened on one side of the arc plate 141 close to the fixed block 147. The rectangular opening is connected to the ascending section 142 and the ascending section 144. The closing block 145 is slidably set in the rectangular opening, and a spring 146 is fixedly connected between the closing block 145 and the fixed block 147. The spring 146 passes through the rectangular opening.

[0046] When the scraper 127 moves from the receiving box 151 at the initial position toward the other receiving box 151, the guide column 128 moves in the downward section 143. As the servo motor 124 continues to operate, the scraper 127 pushes the sediment into the interior of the other receiving box 151. Then, the guide column 128 moves from the interior of the downward section 143 to the interior of the ascending section 144, and rises under the action of the inclined groove wall of the ascending section 144. The guide column 128 drives the movable column 126 and the scraper 127 to rise, and the scraper 127 is out of contact with the curved filter plate 91. During the movement of the guide column 128 in the ascending section 144, the guide column 128 conflicts with the inclined end of the closing block 145, forcing the closing block 145 to move closer to the fixed block 147. The guide column 128 moves in the opposite direction inside the upward section 142, and the spring 146 is compressed until the guide column 128 is out of contact with the closing block 145, and the guide column 128 completely enters the interior of the upward section 142. The closing block 145 returns to its original position under the action of the rebound force of the spring 146, and the closing block 145 closes the connection between the upward section 142 and the ascending section 144. Then, the rotation direction of the output end of the servo motor 124 is changed, so that the guide column 128 moves in the opposite direction inside the upward section 142. After the guide column 128 moves to the other end in the upward section 142, it enters the descending section 143 again through the descending section, so that the guide column 128, the movable column 126, and the scraper 127 return to their initial positions as a whole, and then the sediment adhering to the scraper 127 is cleaned at the initial position.

[0047] A cleaning mechanism 13 is provided at the bottom of the mounting platform 10. The cleaning mechanism 13 is located inside one of the receiving boxes 151. The cleaning mechanism 13 includes a cleaning box 131 fixedly provided below the mounting platform 10. A fixing rod 134 is fixedly connected between the cleaning box 131 and the mounting platform 10. A plurality of nozzles 132 are installed on the side of the cleaning box 131 close to the scraper 127, and the nozzles 132 are inclined toward the bottom of the scraper 127. A water inlet pipe 133 is fixedly provided on the mounting platform 10, and the water inlet pipe 133 is connected to the cleaning box 131.

[0048] When the scraper 127 returns to its initial position, water is supplied to the interior of the cleaning box 131 through the water supply device connected to the water inlet pipe 133, and water is sprayed to the bottom of the scraper 127 through multiple nozzles 132 to clean the scraper 127. The water and the washed sediment are received by the corresponding receiving box 151. After the corresponding receiving box 151 contains a certain amount of water and sediment, the electric telescopic rod 154 is started. The telescopic end of the electric telescopic rod 154 drives the extension plate 153, the supporting plate 152, and the receiving box 151 to descend as a whole until the receiving box 151 is separated from the cleaning mechanism 13 and the scraper 127. The receiving box 151 is removed from the supporting plate 152, and after the water and sediment inside the receiving box 151 are poured out, the receiving box 151 is reinstalled on the supporting plate 152, and then the receiving box 151 is raised and can be continued to be used.

[0049] The method for purifying wastewater based on porous graphene comprises the following steps:

[0050] S1. Before pouring the heavy metal wastewater and the reactants into the wastewater treatment tank 2, a certain amount of porous graphene is first added to the wastewater to pre-mix the porous graphene with the wastewater;

[0051] S2. Pour the pretreated wastewater and the reactant into the wastewater treatment tank 2 to react. The porous graphene can adsorb heavy metal ions in the wastewater to form precipitates.

[0052] Finally, it should be noted that the above is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or make equivalent substitutions for some of the technical features therein. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A heavy metal wastewater treatment device, comprising: A bottom plate, a wastewater treatment box is fixedly arranged above the bottom plate, and the feature is that: a bearing platform is rotatably arranged below the wastewater treatment box, a plurality of filtering mechanisms are annularly installed on the bearing platform, and the plurality of filtering mechanisms can rotate together with the bearing platform, the filtering mechanism includes a curved filter plate, a mounting platform is fixedly arranged above the bottom plate, a cleaning mechanism is arranged on the mounting platform, the cleaning mechanism includes a scraper, a guide column and a curved guide rail fixedly connected to the bottom of the mounting platform, the scraper can follow the movement of the guide column, the running trajectory of the scraper is adapted to the shape of the curved filter plate, the filtering mechanism can be lifted, two sediment receiving mechanisms are symmetrically arranged below the mounting platform, and a cleaning mechanism is provided at the bottom of the mounting platform; The supporting platform includes an inner supporting ring, a plurality of filter holes are formed on the arc-shaped filter plate, an outer arc-shaped plate is fixedly connected to the side of the arc-shaped filter plate away from the inner supporting ring, two outer connecting rods are symmetrically fixedly connected to the outer arc-shaped plate, and an inner arc-shaped plate is fixedly connected to the side of the arc-shaped filter plate close to the inner supporting ring, two inner connecting rods are symmetrically fixedly connected to the inner arc-shaped plate; The outer side of the arc guide rail is slidably connected with an arc rack, and a servo motor is fixedly arranged on the top of the mounting platform, and the output end of the servo motor passes through the mounting platform and is fixedly connected with a matching gear, which is meshed with the arc rack, and the side of the arc rack is fixedly connected with an extension block, and the interior of the extension block is slidably connected with a movable column, and the movable column passes through the extension block, and the bottom of the movable column is fixedly connected to a scraper, and the scraper is adapted to the arc filter plate. An arc displacement port is provided on the mounting platform, and the shape of the arc displacement port is adapted to the motion trajectory of the movable column. The movable column passes through the arc displacement port, and the outer side of the movable column and the position above the mounting platform are fixedly connected to the guide column, and the guide column and the movable column are arranged vertically; Four electric push rods are set under the mounting platform. The fixed ends of the electric push rods are fixed on the top of the base plate. The positions of the four electric push rods correspond to the positions of the two outer connecting rods and the two inner connecting rods respectively. The bottoms of the two outer connecting rods and the two inner connecting rods are provided with docking grooves. A lifting and returning mechanism is provided on the top of the mounting platform, which can lift the guide column, movable column and scraper as a whole and return them to their initial positions; The sediment receiving mechanism includes a receiving box, the cleaning mechanism is located inside one of the receiving boxes, and the cleaning mechanism includes a plurality of nozzles; By rotating the use of multiple filter mechanisms, it is ensured that each filter mechanism has enough rest time for cleaning and maintenance, thereby maintaining the filtration efficiency, and the filter mechanism that has been used can be cleaned without interrupting the processing flow, without stopping the machine to clean the filter mechanism that has been used.

2. A heavy metal wastewater treatment equipment according to claim 1, characterized in that: A fixed platform is fixedly provided on the top of the base plate. The fixed platform is annular, and an installation opening is provided on the fixed platform corresponding to the position of the holding box. The installation opening of the fixed platform is used to install the holding box. The top of the fixed platform is rotatably connected to a bearing platform. The bearing platform includes an inner bearing ring and an outer bearing ring rotatably connected to the top of the fixed platform. The fixed platform, the inner bearing ring and the outer bearing ring are all coaxially arranged, and the inner bearing ring is on the inner side of the outer bearing ring. A plurality of connecting rods are fixedly connected between the inner bearing ring and the outer bearing ring. There is a distance between the inner bearing ring and the outer bearing ring. The outer ring of the outer bearing ring is fixedly connected to a gear ring. A driving motor is fixedly provided on the top of the base plate. The output end of the driving motor is fixedly connected to a driving gear. The driving gear is meshed with the gear ring. An annular mounting groove is provided on the top of the bearing platform, and a plurality of filtering mechanisms are installed in the annular mounting groove of the bearing platform.

3. A heavy metal wastewater treatment equipment according to claim 2, characterized in that: The bottom surface of the outer arc plate is in sliding cooperation with the top surface of the outer bearing ring; the bottom surface of the inner arc plate is in sliding cooperation with the top surface of the inner bearing ring.

4. The heavy metal wastewater treatment equipment according to claim 1, characterized in that: Two support rods are symmetrically fixedly connected to the bottom of the mounting platform, and the bottoms of the support rods are fixedly connected to the bottom plate. The cleaning mechanism can clean the filter mechanism.

5. The heavy metal wastewater treatment equipment according to claim 1, characterized in that: The sediment receiving mechanism also includes a carrying plate and two electric telescopic rods fixedly arranged on the top of the base plate. Two extension plates are symmetrically fixedly connected to the side of the carrying plate. The telescopic ends of the electric telescopic rods are fixedly connected to the corresponding extension plates. A receiving box is installed on the top of the carrying plate. A receiving groove for adapting to the receiving box is opened on the top of the carrying plate. The bottom of the receiving box is installed in the receiving groove of the carrying plate. Notches are opened on the sides of the two receiving boxes close to each other, and the notches are used for the passage of the scraper.

6. The heavy metal wastewater treatment equipment according to claim 1, characterized in that: The lifting return mechanism includes an arc plate fixedly connected to the top of the mounting platform, a track groove is opened on the side of the arc plate near the guide column, and the end of the guide column is cooperated and arranged inside the track groove, the track groove includes an ascending section, a descending section, a descending section, and an ascending section, one end of the ascending section is connected with the descending section through the descending section, the descending section is inclined downward starting from near the ascending section, the other end of the ascending section is connected with the descending section through the ascending section, the ascending section is inclined upward starting from near the descending section, a closing block is provided at the connection between the ascending section and the ascending section, the end of the closing block is inclined, a vertical fixed block is fixedly connected to the top of the mounting platform, a rectangular opening is opened on one side of the arc plate near the fixed block, the rectangular opening is connected with the ascending section and the ascending section, the closing block is slidably arranged in the rectangular opening, and a spring is fixedly connected between the closing block and the fixed block, and the spring passes through the rectangular opening.

7. The heavy metal wastewater treatment equipment according to claim 1, characterized in that: The cleaning mechanism also includes a cleaning box fixedly arranged under the mounting platform, a fixing rod fixedly connected between the cleaning box and the mounting platform, a plurality of nozzles are installed on the side of the cleaning box close to the scraper, and the nozzles are inclined toward the bottom of the scraper, and a water inlet pipe is fixedly arranged on the mounting platform, and the water inlet pipe is connected to the cleaning box.

8. The heavy metal wastewater treatment equipment according to claim 1, characterized in that: L-shaped brackets are fixedly connected to both sides of the wastewater treatment box, the bottom of the L-shaped bracket is fixedly connected to the bottom plate, and a holding box is fixedly provided on the top of the bottom plate and below the wastewater treatment box.

9. A method for purifying wastewater based on porous graphene, using a heavy metal wastewater treatment device according to any one of claims 1 to 8, characterized in that: The following steps are involved: S1. Before pouring the heavy metal wastewater and the reactant into the wastewater treatment tank, a certain amount of porous graphene is added to the wastewater to pre-mix the porous graphene with the wastewater; S2. Pour the pretreated wastewater and the reactant into the wastewater treatment tank to react. The porous graphene can adsorb heavy metal ions in the wastewater to form precipitates.

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