Heavy metal wastewater treatment equipment and sewage purification method based on porous graphene

Abstract

The invention discloses heavy metal wastewater treatment equipment and a sewage purification method based on porous graphene, and relates to the technical field of heavy metal wastewater treatment.The heavy metal wastewater treatment equipment comprises a bottom plate, a wastewater treatment box is fixedly arranged above the bottom plate, and the heavy metal wastewater treatment equipment is characterized in that a bearing table is rotationally arranged below the wastewater treatment box; a plurality of filtering mechanisms are annularly mounted on the bearing table and can rotate along with the bearing table, each filtering mechanism comprises an arc-shaped filtering plate, a mounting table is fixedly arranged above the bottom plate, a cleaning mechanism is arranged on the mounting table and comprises a scraping plate and a guide column body, and the scraping plate can move along with the guide column body. And the moving track of the scraper is matched with the shape of the arc-shaped filter plate, so that the problems that the existing filter plate can be disassembled and cleaned only after the whole filtering task is completed, and the filter plate cannot be replaced and must bear long-time continuous use during the filtering operation are solved.

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, chromium, etc. 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, the 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 pad 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 card plates are rotated, and the top of the card plate is rotated from the card slot inside the two fixed blocks to the bottom of the two fixed rods. The filter plate is pulled out or inserted into the movable slot by holding the handle, which can facilitate the removal and installation of the filter plate when replacing and cleaning, and also avoids the impact of a lot of time required for dismantling and installing when replacing and cleaning the filter plate.

[0004] The above patents and prior art also have the following defects: when a large amount of wastewater containing heavy metals 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 the entire filtration task is completed, and 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 is fixedly arranged above the base plate, and is characterized in that: a bearing platform is rotatably arranged below the wastewater treatment box, a plurality of filtering mechanisms are installed in a ring shape on the bearing platform, and the plurality of filtering mechanisms can rotate with the bearing platform, the filtering mechanism comprises 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 comprises 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 opened at a position of the fixed platform corresponding to the containing box, the installation opening of the fixed platform is used to install the containing 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 a spacing is provided 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, a driving gear is fixedly connected to the output end of the driving motor, and the driving gear is meshingly connected to the gear ring, an annular installation groove is opened on the top of the bearing platform, and a plurality of filtering mechanisms are installed in the annular installation groove of the bearing platform.

[0009] Preferably, there are multiple filter holes on the arc filter plate, and an outer arc plate is fixedly connected to the side of the arc filter plate away from the inner bearing ring, and two outer connecting rods are symmetrically fixedly connected to the outer arc plate, and an inner arc plate is fixedly connected to the side of the arc filter plate close to the inner bearing ring, 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, two support rods are symmetrically fixedly connected to the bottom of the mounting platform, and the bottom of the support rods is fixedly connected to the bottom plate, and the cleaning mechanism can clean the filtering mechanism, and the cleaning mechanism includes an arc guide rail fixedly connected to the bottom of the mounting platform, and an arc rack is slidably connected to the outer side of the arc guide rail, 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 to a matching gear, and the matching gear is meshed with the arc rack, and an extension block is fixedly connected to the side of the arc rack, and a movable column is slidably connected to the inside of the extension block, 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, and an arc displacement opening is opened on the mounting platform, and the shape of the arc displacement opening is adapted to the movement trajectory of the movable column, and the movable column passes through the arc displacement opening, and the outer side of the movable column and the position above the mounting platform is fixedly connected to a guide column, and the guide column and the movable column are vertically arranged.

[0011] Preferably, four electric push rods are arranged under the mounting platform, and the fixed ends of the electric push rods are fixedly arranged 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 adapted for 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, and 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.

[0013] Preferably, a lifting and returning mechanism is provided on the top of the mounting platform, and the lifting and returning mechanism can lift the guide column, movable column and scraper as a whole and return to the initial position, and the lifting and returning mechanism comprises an arc plate fixedly connected to the top of the mounting platform, and 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, and the track groove comprises an ascending section, a descending section, a descending section and an ascending section, and one end of the ascending section is connected with the descending section through the descending section, and the descending section is arranged downwardly inclined starting from near the ascending section, and the other end of the ascending section is connected with the descending section through the ascending section, and the ascending section is arranged upwardly inclined starting from near the descending section, and a closing block is arranged at the connection between the ascending section and the ascending section, and the end of the closing block is inclined, and a vertical fixed block is fixedly connected to the top of the mounting platform, and a rectangular opening is opened on one side of the arc plate near the fixed block, and the rectangular opening is connected with the ascending section and the ascending section, and 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.

[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 is 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.

[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 containing 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: S1. Before pouring the heavy metal wastewater and the reactant into the wastewater treatment tank, a certain amount of porous graphene is added into the wastewater to pre-mix the porous graphene with the wastewater; S2. Pour the pretreated wastewater and the reactant into a wastewater treatment tank for reaction. The porous graphene can adsorb heavy metal ions in the wastewater to form precipitates.

[0017] In summary, the technical effects and advantages of the present invention are as follows: 1. In the present invention, a plurality of filtering mechanisms are designed in the device, and the plurality of 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 used, 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 of filtering efficiency caused by long-term continuous use.

[0018] 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 arc-shaped filter plate to scrape off the sediment. After the 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 arc-shaped filter plate again. After the sediment on the scraper is rinsed clean, the scraper scrapes off the residual sediment on the arc-shaped filter plate again. In this way, the sediment on the arc-shaped filter plate is cleaned up without the need to disassemble the filter mechanism for cleaning.

[0019] 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, and the receiving box can be easily removed, cleaned and reinstalled. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the embodiments of the present application 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 application. For those skilled in the art, other drawings can be obtained based on these drawings without paying any creative work.

[0021] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention; Figure 2 It is a structural schematic diagram of another perspective of the present invention; Figure 3 It is a structural schematic diagram of the bearing platform and the fixing platform of the present invention; Figure 4 It is a structural schematic diagram of the filtering mechanism of the present invention; Figure 5 It is a schematic diagram of the bottom structure of the mounting platform of the present invention; Figure 6 For the present invention Figure 5 The enlarged structural diagram of part A in the middle; Figure 7 It is a schematic diagram of the top structure of the mounting platform of the present invention; Figure 8 For the present invention Figure 7 The enlarged structural diagram of part B in the middle; Fig. 9 It is a structural schematic diagram of the sediment receiving mechanism of the present invention.

[0022] In the figure: 1, bottom plate; 2, wastewater treatment box; 3, L-shaped bracket; 4, containing 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, bearing plate; 153, extension plate; 154, electric telescopic rod; 16, electric push rod. DETAILED DESCRIPTION

[0023] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0024] Example: Reference Figure 1-Figure 9 A heavy metal wastewater treatment equipment shown in the figure comprises: a base plate 1, a wastewater treatment box 2 is fixedly arranged above the base plate 1, L-shaped brackets 3 are fixedly connected to both sides of the wastewater treatment box 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 box 2. A liquid inlet pipe (not shown in the figure) is connected to the side of the wastewater treatment box 2, a stirring mechanism (not shown in the figure) is arranged inside the wastewater treatment box 2, a liquid outlet pipe is arranged at the bottom of the wastewater treatment box 2, and a containing box 4 is fixedly arranged at the top of the base plate 1 and below the wastewater treatment box 2.

[0025] The stirring mechanism includes a stirring motor fixedly arranged on the top of the wastewater treatment tank 2, the output end of the stirring motor penetrates the top of the wastewater treatment tank 2 and extends to the inside of the wastewater treatment tank 2, the output end of the stirring motor is fixedly connected to a fixed shaft, the fixed shaft is inside the wastewater treatment tank 2, and the outer side of the fixed shaft is fixedly connected to a plurality of stirring rods, and the plurality of stirring rods are vertically distributed. The heavy metal wastewater and the reactant are poured into the inside of the wastewater treatment tank 2 through the liquid inlet pipe on the side of the wastewater treatment tank 2, 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, so that the heavy metal wastewater and the reactant are fully contacted and the reaction speed is accelerated, and the heavy metal wastewater reacts with the reactant and generates a precipitate.

[0026] A fixing platform 5 is fixedly arranged on the top of the bottom plate 1. The fixing platform 5 is annular, and an installation opening is opened at the position of the fixing platform 5 corresponding to the position of the containing box 4. The installation opening of the fixing platform 5 is used to install the containing box 4. A bearing platform 6 is rotatably connected to the top of the fixing platform 5. The bearing platform 6 includes an inner bearing ring 61 and an outer bearing ring 62 rotatably connected to the top of the fixing platform 5. The fixing platform 5, the inner bearing ring 61, and the outer bearing ring 62 are all coaxially arranged, and the inner bearing ring 61 is located 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. The connecting rods 63 make the inner bearing ring 6 1 and the outer bearing ring 62 form a whole and can rotate at the same time. The outer ring of the outer bearing ring 62 is fixedly connected with a gear ring 621. A driving motor 7 is fixedly arranged on the top of the bottom plate 1. The output end of the driving motor 7 is fixedly connected with a 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 bearing platform 6, and the plurality of filtering mechanisms 9 can rotate with the bearing platform 6. An annular installation groove is opened on the top of the bearing platform 6 (referring to the combined structure of the inner bearing ring 61 and the outer bearing ring 62). The plurality of filtering mechanisms 9 are installed in the annular installation groove of the bearing platform 6. The bearing platform 6 is arranged below the wastewater treatment tank 2.

[0027] The filtering mechanism 9 includes an arc-shaped filter plate 91, on which a plurality of filtering holes 92 are provided. An outer arc-shaped plate 93 is fixedly connected to the side of the arc-shaped filter plate 91 away from the inner bearing ring 61, and two outer connecting rods 931 are symmetrically fixedly connected to the outer arc-shaped plate 93. An inner arc-shaped plate 94 is fixedly connected to the side of the arc-shaped filter plate 91 close to the inner bearing ring 61, 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 is slidably matched with the top surface of the outer bearing ring 62 (the trajectory of the sliding match is circular), and the bottom surface of the inner arc-shaped plate 94 is slidably matched with the top surface of the inner bearing ring 61 (the trajectory of the sliding match is circular).

[0028] Open the valve of the liquid outlet pipe of the wastewater treatment box 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 bearing ring 61 and the outer bearing ring 62 in turn and enters the interior of the containing box 4. When the wastewater treatment box 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 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 box 2, and continues to filter 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.

[0029] The filter mechanism 9 that has been used for a long time is prone to clogging, resulting in a decrease in the 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.

[0030] A mounting platform 10 is fixedly arranged above the bottom plate 1, and two support rods 11 are symmetrically fixedly connected to the bottom of the mounting platform 10, and the bottom of the support rods 11 is fixedly connected to the bottom plate 1. A cleaning mechanism 12 is arranged on the mounting platform 10, and the cleaning mechanism 12 can clean the filtering 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 arranged on the top of the mounting platform 10, and the servo motor 124 is fixedly arranged 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 with a matching gear 123, which is meshed with the arc-shaped rack 122. The side of the arc-shaped rack 122 is fixedly connected with an extension block 125, and the interior of the extension block 125 is slidably connected with a movable column 126, which passes through the extension block 125. The bottom of the movable column 126 is fixedly connected with a scraper 127, which 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 scraper 127 is adapted to the shape of the arc filter plate 91, and the installation platform 10 is provided with an arc displacement port 101. The shape of the arc displacement port 101 is adapted to the movement trajectory of the movable column 126. The movable column 126 runs through the arc displacement port 101. The outer side of the movable column 126 and the position above the installation 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 displacement opening 101. After the scraper 127 scrapes off the sediment on the arc filter plate 91, the guide column 128, the movable column 126 and the scraper 127 can be lifted up as a whole and return to the initial position (to prevent the contaminated scraper 127 from contacting the arc filter plate 91 again). After the sediment on the scraper 127 is rinsed clean, the scraper 127 scrapes off the residual sediment on the arc filter plate 91 again. In this way, the sediment on the arc filter plate 91 is cleaned up.

[0031] Four electric push rods 16 are arranged below the mounting platform 10, and the fixed ends of the electric push rods 16 are fixedly arranged on the top of the bottom plate 1. The positions of the four electric push rods 16 correspond to the positions of the two outer connecting rods 931 and the two inner connecting rods 941, respectively. The bottoms of the two outer connecting rods 931 and the two inner connecting rods 941 are provided with docking grooves. When the sediment on the filter mechanism 9 is to be cleaned, when the filter mechanism 9 to be cleaned rotates to the position corresponding to the electric push rod 16, the operation of the drive motor 7 is stopped, and the electric push rod 16 is started, and the telescopic end of the electric push rod 16 rises, and then the telescopic end of the electric push rod 16 enters the corresponding docking groove, and the telescopic end of the electric push rod 16 continues to rise, and the arc filter plate 91 is lifted to the height position corresponding to the scraper 127 through the outer connecting rod 931 and the inner connecting rod 941, so that the scraper 127 can abut against the arc filter plate 91 when rotating.

[0032] Two sediment receiving mechanisms 15 are symmetrically arranged below the mounting platform 10, and the sediment receiving mechanism 15 includes a carrying plate 152, and two extension plates 153 are symmetrically fixedly connected to the side 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, and 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, and a receiving groove adapted to the receiving box 151 is opened 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, and the sides of the two receiving boxes 151 close to each other are opened with notches, and 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 arc filter plate 91 is lifted to the height position corresponding to the scraper 127, the top surfaces of the outer arc plate 93 and the inner arc 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 arc filter plate 91. The scraper 127 can enter the interior of the receiving box 151 from the top of the arc filter plate 91.

[0033] When preparing to clean the sediment on the filter mechanism 9, wait until the filter mechanism 9 that needs to be cleaned rotates to the position corresponding to the electric push rod 16, stop the operation of the drive motor 7, use the electric push rod 16 to lift the arc filter plate 91 to the height position corresponding to the scraper 127, and the top surfaces of the outer arc plate 93 and the inner arc 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 arc 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 lifted arc passage from the inside of one of the receiving boxes 151. The top of the filter plate 91, and with the movement of the scraper 127, 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 rinsed clean, 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 up, 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 descended, 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 waiting to be used again.

[0034] A lifting return mechanism 14 is provided on the top of the mounting platform 10. The lifting return 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 return mechanism 14 includes an arc plate 141 fixedly connected to the top of the mounting platform 10. The arc plate 141 is provided with a track groove on the side close to the guide column 128. The end of the guide column 128 is matched 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 the downward section 143 through the descending section. The descending section is inclined downward starting from the position close to the upward section 142. The other end of the upward section 142 is connected with the downward section 143 through the ascending section 144. The ascending section 144 is inclined upward starting from the downward section 143. A closing block 145 is provided at the connection between the upward 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 provided on one side of the arc plate 141 close to the fixed block 147. The rectangular opening is connected with the upward 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, and the spring 146 passes through the rectangular opening.

[0035] 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 descending section 143. As the servo motor 124 continues to operate, the scraper 127 pushes the sediment into the other receiving box 151. Then, the guide column 128 moves from the interior of the descending 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 arc 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 upward direction, 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.

[0036] 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.

[0037] When the scraper 127 returns to the 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, and 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, and the receiving box 151 is removed from the supporting plate 152. After the water and sediment in 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 continue to be used.

[0038] The method for purifying wastewater based on porous graphene comprises the following steps: S1. Before pouring the heavy metal wastewater and the reactant into the wastewater treatment tank 2, a certain amount of porous graphene is first added into the wastewater to pre-mix the porous graphene with the wastewater; 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.

[0039] 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, it is still possible for those skilled in the art to modify the technical solutions described in the aforementioned embodiments, or to 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 protection scope 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 its characteristics are: a bearing platform is rotatably arranged below the wastewater treatment box, a plurality of filtering mechanisms are installed in a ring shape on the bearing platform, and the plurality of filtering mechanisms can rotate with the bearing platform, the filtering mechanism comprises an arc-shaped filter plate, a mounting platform is fixedly arranged above the bottom plate, a cleaning mechanism is arranged on the mounting platform, the cleaning mechanism comprises a scraper and a guide column, the scraper can follow the movement of the guide column, the running track 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.

2. A heavy metal wastewater treatment equipment according to claim 1, characterized in that: A fixed platform is fixedly arranged on the top of the bottom plate. The fixed platform is annular, and an installation opening is opened at the position of the fixed platform corresponding to the containing box, and the installation opening of the fixed platform is used to install the containing box. A bearing platform is rotatably connected to the top of the fixed platform, and 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 located 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 spacing between the inner bearing ring and the outer bearing ring. A gear ring is fixedly connected to the outer ring of the outer bearing ring, and a driving motor is fixedly arranged on the top of the bottom plate. A driving gear is fixedly connected to the output end of the driving motor, and the driving gear is meshingly connected to the gear ring. An annular installation groove is opened on the top of the bearing platform, and a plurality of filtering mechanisms are installed in the annular installation groove of the bearing platform.

3. A heavy metal wastewater treatment equipment according to claim 2, characterized in that: There are multiple filter holes on the arc filter plate. 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.

4. A 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 bottom of the support rods is fixedly connected to the bottom plate. The cleaning mechanism can clean the filtering mechanism, and the cleaning mechanism includes an arc guide rail fixedly connected to the bottom of the mounting platform, and an arc rack is slidably connected to the outer side of the arc guide rail. 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 to a matching gear, and the matching gear is meshed with the arc rack. An extension block is fixedly connected to the side of the arc rack, and a movable column is slidably connected to the inside of the extension block, and the movable column passes through the extension block. 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 opening is opened on the mounting platform, and the shape of the arc displacement opening is adapted to the motion trajectory of the movable column. The movable column passes through the arc displacement opening, and the outer side of the movable column and the position above the mounting platform is fixedly connected to a guide column, and the guide column and the movable column are vertically arranged.

5. A heavy metal wastewater treatment equipment according to claim 3, characterized in that: Four electric push rods are arranged under the mounting platform, and the fixed ends of the electric push rods are fixedly arranged 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 docking grooves are provided at the bottoms of the two outer connecting rods and the two inner connecting rods.

6. A heavy metal wastewater treatment equipment according to claim 1, characterized in that: 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 bottom 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 adapted 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, and 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.

7. A heavy metal wastewater treatment equipment according to claim 4, characterized in that: The top of the mounting platform is provided with a lifting and returning mechanism, which can lift the guide column, the movable column and the scraper as a whole and return them to the initial position. The lifting and returning mechanism comprises an arc plate fixedly connected to the top of the mounting platform, a track groove is opened on the side of the arc plate close to the guide column, and the end of the guide column is cooperatively arranged in the track groove, the track groove comprises 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 arranged downwardly inclined starting from the ascending section, the other end of the ascending section is connected with the descending section through the ascending section, the ascending section is arranged upwardly inclined starting from the descending section, a closing block is arranged at the connection between the ascending section and the ascending section, the end of the closing block is arranged obliquely, a vertical fixed block is fixedly connected with the top of the mounting platform, a rectangular opening is opened on the side of the arc plate close to 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.

8. A heavy metal wastewater treatment equipment according to claim 6, characterized in that: The cleaning mechanism is located inside one of the receiving boxes. The cleaning mechanism includes a cleaning box fixedly arranged under the mounting platform. A fixing rod is 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. A water inlet pipe is fixedly arranged on the mounting platform, and the water inlet pipe is connected to the cleaning box.

9. A 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 containing box is fixedly arranged on the top of the bottom plate and below the wastewater treatment box.

10. A method for purifying wastewater based on porous graphene, using a heavy metal wastewater treatment device as described in any one of claims 1 to 9, 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 into the wastewater to pre-mix the porous graphene with the wastewater; S2. Pour the pretreated wastewater and the reactant into a wastewater treatment tank for reaction. The porous graphene can adsorb heavy metal ions in the wastewater to form precipitates.

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