A device and method for treating acidic heavy metal river wastewater

Abstract

The application relates to the technical field of wastewater treatment, in particular to a device and method for treating acid heavy metal river wastewater, which comprises an electrolytic cell, one end of the electrolytic cell is provided with a neutralization reaction tank, the other end of the neutralization reaction tank is provided with a coagulation reaction tank, the other end of the coagulation reaction tank is provided with a flocculation reaction tank, the other end of the flocculation reaction tank is provided with a sedimentation tank, and the other end of the sedimentation tank is provided with a filter tank; the cleaning mechanism is arranged, heavy metal atom deposits deposited on the surface of the cathode roller can be scraped off by the first scraper, the surface of the cathode roller is kept clean at all times, the effective contact area of the cathode roller and the wastewater can be guaranteed, the uniformity of the current on the surface of the cathode roller is guaranteed, the electrolytic cell can always maintain the original working efficiency, workers do not need to stop working for cleaning, the probability of the electrolytic cell stopping working is reduced, and the normal working efficiency of the electrolytic cell is guaranteed.

Description

Technical Field

[0001] This invention relates to the field of wastewater treatment technology, and in particular to an apparatus and method for treating acidic heavy metal river wastewater. Background Technology

[0002] The non-ferrous metals industry generates acidic wastewater with low pH and containing heavy metals during mining, beneficiation, and smelting processes. If left untreated, this wastewater can corrode infrastructure such as sewer pipes and hydraulic structures. The heavy metals can severely pollute surface water, groundwater, and soil, affecting the growth and reproduction of plants and animals and posing a significant threat to environmental quality and human health. Currently, most treatment methods involve acid-base neutralization and electrolytic precipitation to remove acidic substances and heavy metals from river wastewater.

[0003] Currently, after prolonged treatment of acidic heavy metal river wastewater, electrolytic precipitation devices easily produce a significant amount of precipitates at their cathodes. These precipitates affect the electrolysis efficiency of the device. When the precipitates accumulate to a certain level, the machine needs to be shut down to clean them. This not only delays the treatment of acidic heavy metal river wastewater but also increases the workload of the staff. Summary of the Invention

[0004] The purpose of this invention is to provide an apparatus and method for treating acidic heavy metal river wastewater in order to solve the above-mentioned problems, thereby improving the existing acidic heavy metal river wastewater treatment devices that require shutdown for cleaning and maintenance after a specified period of use, and thus cannot meet the requirements for continuous use.

[0005] The present invention achieves the above-mentioned objective through the following technical solution: a treatment device for acidic heavy metal river wastewater, comprising an electrolytic cell, a neutralization reaction tank installed at one end of the electrolytic cell, a coagulation reaction tank installed at the other end of the neutralization reaction tank, a flocculation reaction tank installed at the other end of the coagulation reaction tank, a sedimentation tank installed at the other end of the flocculation reaction tank, and a filter tank installed at the other end of the sedimentation tank; the electrolytic cell includes an anode tank, one end of which is fixedly connected to and communicates with an inlet pipe, and the other end of which is fixedly connected to and communicates with an outlet pipe communicating with the neutralization reaction tank; a cathode roller is rotatably connected to the top of the anode tank, one end of which is fixedly connected to a drive motor, the output shaft of which is fixedly connected to a cleaning mechanism in contact with the cathode roller, the other end of which is fixedly connected to and communicates with a centralized storage mechanism, and two filter mechanisms, respectively fixedly connected to and communicating with the inlet pipe and the outlet pipe, are fixedly connected to the surface of the centralized storage mechanism.

[0006] Preferably, the cleaning mechanism includes a connecting circular box fixedly connected to the top of the anode tank. A guide port is formed on the upper surface of the connecting circular box. A first scraper is fixedly connected to the inner wall of the guide port. The other end of the first scraper passes through the guide port and contacts the cathode roller. The length of the first scraper is greater than the length of the cathode roller. A first guide pipe, fixedly connected and communicating with a centralized storage mechanism, is fixedly connected to the other end of the connecting circular box. An auger conveyor shaft is rotatably connected to the inner wall of the connecting circular box. The other end of the auger conveyor shaft extends to the outside of the connecting circular box. First sprockets are fixedly connected to the other end of the auger conveyor shaft and the output shaft of the drive motor. A first chain meshes with the surface of one of the first sprockets and meshes with the other first sprocket. The two first sprockets are connected by the first chain. By setting up the cleaning mechanism, a material is deposited on the surface of the cathode roller. During the heavy metal atom removal process, the drive motor rotates the cathode roller. At this time, the first scraper scrapes off the heavy metal atom deposits on the surface of the cathode roller, keeping the surface of the cathode roller clean. This ensures the effective contact area between the cathode roller and the wastewater, guaranteeing not only the uniformity of the current on the cathode roller surface and allowing the electrolytic cell to maintain its original working efficiency, but also eliminating the need for personnel to stop cleaning, thus reducing the probability of electrolytic cell shutdown and ensuring normal working efficiency. Simultaneously, the drive motor drives the auger conveyor shaft through the first sprocket and the first chain to transport the metal atom deposits through the connecting round box into the first feed pipe. The first feed pipe then transports the metal atom deposits into the centralized storage mechanism. This ensures that the connecting round box can always hold the metal atom deposits, eliminating the need for personnel to stop cleaning, further ensuring the operating efficiency of the electrolytic cell.

[0007] Preferably, the lowest point of the connection between the connecting round box and the first guide pipe is flush with the lowest point inside the connecting round box, and the diameter of the auger conveyor shaft is the same as the inner diameter of the connecting round box. This can improve the effective conveying rate of the metal atom deposits inside the connecting round box into the first guide pipe by the auger conveyor shaft, thereby reducing the retention rate of metal atom deposits inside the connecting round box.

[0008] Preferably, a first filter screen is embedded in the lower surface of the connecting circular box. The cross-sectional shape of the first filter screen is arc-shaped, and the center point of the first filter screen coincides with the axis of the auger conveyor shaft. The first filter screen is located directly above the anode tank, and the size of the first filter screen is smaller than the size of the anode tank. This can filter out some of the water passing through the metal atom deposits, which can not only reduce the waste of water resources, but also reduce the amount of water retained inside the centralized storage mechanism, thereby reducing the cleaning burden on the staff later.

[0009] Preferably, the upper surface of the connecting round box is fixedly connected with two blocking blocks, both of which are fixedly connected to the first scraper. The blocking blocks are symmetrically distributed on both sides of the feed inlet. The height of the blocking blocks is greater than the height of the first scraper. This can prevent the metal atom precipitate scraped off by the first scraper from returning to the interior of the anode tank through the gap between the first scraper and the connecting round box, thereby achieving a good blocking effect.

[0010] Preferably, the centralized storage mechanism includes a mounting box fixedly connected to the other end of the first feed pipe. One end of the mounting box has a connecting cavity communicating with the bottom wall of the mounting box. A first collection box is inserted into the inner wall of the mounting box, and the other end of the first collection box extends to the outside of the mounting box. A second filter screen is embedded in the bottom of the first collection box. A second collection box is inserted into the inner wall of the connecting cavity, and the other end of the second collection box extends to the outside of the connecting cavity. By setting up a centralized storage mechanism, not only can the waste produced by the cleaning mechanism and the filtration mechanism be collected together, reducing the burden of subsequent waste cleaning for the staff, but the centralized storage mechanism can also separate the solid and liquid waste, eliminating the need for subsequent dehydration treatment of the waste by the staff, further reducing the burden of subsequent waste cleaning for the staff.

[0011] Preferably, the vertical inner wall of the connecting cavity is fixedly connected to and communicates with an exhaust fan, and the other end of the exhaust fan is fixedly connected to and communicates with a cyclone separator. A third collection box is inserted into the inner bottom wall of the cyclone separator, and the other end of the third collection box extends through to the outside of the cyclone separator. This not only accelerates the solid-liquid separation rate of the waste inside the first collection box, but also guides the waste inside the connecting round box and the mounting round box into the interior of the mounting box through airflow, thereby reducing the probability of waste remaining inside the connecting round box and the mounting round box. At the same time, the cyclone separator design can separate the water in the air discharged by the exhaust fan, so that the discharged air remains dry.

[0012] Preferably, one of the filtering mechanisms includes a mounting circular box fixedly connected to and communicating with the surface of the inlet pipe. A third filter screen is embedded in the mounting circular box at the communication point between the mounting circular box and the inlet pipe near the anode tank. A drive shaft is rotatably connected to the inner wall of the mounting circular box. The other end of the drive shaft extends to the outside of the mounting circular box. A second sprocket is fixedly connected to the other end of the drive shaft and the output shaft of a drive motor. A second chain is meshed with the surface of one of the second sprockets and meshes with the other second sprocket. The two second sprockets are connected by a drive chain. A cylindrical filter screen rotatably connected to the surface of the drive shaft and rotatably connected to the mounting circular box is rotatably connected to the surface of the cylindrical filter screen. Second scrapers distributed in a ring are fixedly connected to the surface of the cylindrical filter screen. One end of the third filter screen is connected to the... Adjacent to the second scraper, one end of the mounting round box is fixedly connected and communicates with a second guide pipe that is fixedly connected and communicates with the mounting box. The center point of the connection between the mounting round box and the second guide pipe is set on the same horizontal line as the highest point of the cylindrical filter screen. By setting up a filtration mechanism, solid impurities mixed in the wastewater can be filtered, making the wastewater entering and exiting the anode tank purer and reducing interference with electrolysis and neutralization reactions. At the same time, in conjunction with the drive motor and centralized storage mechanism, the filtered solid impurities can be transported into the centralized storage mechanism, enabling the filtration mechanism to operate normally. This reduces the problem of wastewater not being able to pass through normally due to excessive accumulation of impurities inside the filtration mechanism causing blockage.

[0013] Preferably, the cross-sectional shape of the cylindrical filter screen is conical, and the diameter of the cylindrical filter screen gradually decreases from the mounting box to the second guide pipe. This can reduce the friction between solid impurities and the cylindrical filter screen, allowing the airflow to more easily guide the solid impurities into the second guide pipe.

[0014] Preferably, the other end of the mounting box is fixedly connected to and communicates with a filter screen box, and the filter screen box and one end of the second guide tube are set on the same horizontal line. This can ensure that the air entering the mounting box remains clean and reduce the impact on the overall operation of the filtration mechanism.

[0015] The beneficial effects of this invention are:

[0016] 1. By setting up a cleaning mechanism, the first scraper can scrape off the heavy metal atom deposits deposited on the surface of the cathode roller, keeping the surface of the cathode roller clean at all times. This ensures the effective contact area between the cathode roller and the wastewater, not only ensuring the uniformity of the current on the cathode roller surface, but also allowing the electrolytic cell to maintain its original working efficiency. At the same time, it eliminates the need for staff to stop the machine for cleaning, thereby reducing the probability of electrolytic cell shutdown and ensuring the normal working efficiency of the electrolytic cell. Meanwhile, the drive motor can drive the auger conveyor shaft through the first sprocket and the first chain to transport the metal atom deposits through the connecting round box into the first feed pipe. The first feed pipe then transports the metal atom deposits into the centralized storage mechanism. This ensures that the connecting round box can always hold the metal atom deposits, eliminating the need for staff to stop the machine for centralized cleaning, further ensuring the operating efficiency of the electrolytic cell.

[0017] 2. By setting up a centralized storage mechanism, the waste produced by the cleaning and filtration mechanisms can be collected together, reducing the burden on staff for subsequent waste cleaning. In addition, the centralized storage mechanism can separate solid and liquid waste, eliminating the need for staff to dehydrate the waste afterward, further reducing the burden on staff for subsequent waste cleaning. At the same time, the design of the exhaust fan can not only accelerate the solid-liquid separation rate of waste inside the first collection box, but also guide the waste inside the connecting round box and the installation round box into the installation box through airflow, thereby reducing the probability of waste remaining inside the connecting round box and the installation round box.

[0018] 3. By setting up a filtration mechanism, solid impurities mixed in with the wastewater can be filtered out, making the wastewater entering and exiting the anode tank purer and reducing interference with electrolysis and neutralization processes. In conjunction with the drive motor and centralized storage mechanism, the filtered solid impurities can be transported into the centralized storage mechanism, ensuring the normal operation of the filtration mechanism. This reduces the problem of wastewater not being able to pass through properly due to excessive accumulation of impurities inside the filtration mechanism causing blockage. Attached Figure Description

[0019] Figure 1 This is a flowchart of the acidic heavy metal wastewater treatment process in this invention;

[0020] Figure 2 This is a schematic diagram of the electrolytic cell in this invention;

[0021] Figure 3 This is a schematic diagram showing a partial structure of the electrolytic cell in this invention;

[0022] Figure 4 This is a schematic diagram of the cleaning mechanism in this invention;

[0023] Figure 5This is a cross-sectional schematic diagram of the cleaning mechanism in this invention;

[0024] Figure 6 This is a cross-sectional schematic diagram of the connection between the circular box and the auger conveyor shaft in this invention;

[0025] Figure 7 This is a cross-sectional schematic diagram of the centralized storage mechanism in this invention;

[0026] Figure 8 This is a schematic diagram of the filtration mechanism in this invention;

[0027] Figure 9 This is a cross-sectional schematic diagram of a partial structure of the filtration mechanism in this invention;

[0028] Figure 10 This is a cross-sectional schematic diagram showing the arrangement of the second feed tube and the filter screen box in this invention.

[0029] In the diagram: 1. Electrolytic cell; 11. Anode tank; 12. Inlet pipe; 13. Outlet pipe; 14. Cathode roller; 15. Drive motor; 16. Cleaning mechanism; 161. Connecting round box; 162. Feed inlet; 163. First scraper; 164. First feed pipe; 165. Screw conveyor shaft; 166. First sprocket; 167. First chain; 168. First filter screen; 169. Blocking block; 17. Centralized storage mechanism; 171. Mounting box; 172. Connecting cavity; 173. First collection box; 74. Second filter screen; 175. Second collection box; 176. Exhaust fan; 177. Cyclone separator; 178. Third collection box; 18. Filtration mechanism; 181. Mounting round box; 182. Third filter screen; 183. Drive shaft; 184. Second sprocket; 185. Second chain; 186. Cylindrical filter screen; 187. Second scraper; 188. Second feed pipe; 189. Filter screen box; 2. Neutralization reaction tank; 3. Coagulation reaction tank; 4. Flocculation reaction tank; 5. Sedimentation tank; 6. Filtration tank. Detailed Implementation

[0030] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0031] In practical implementation: such as Figure 1-10As shown, a treatment device for acidic heavy metal river wastewater includes an electrolytic cell 1, a neutralization reaction tank 2 installed at one end of the electrolytic cell 1, a coagulation reaction tank 3 installed at the other end of the neutralization reaction tank 2, a flocculation reaction tank 4 installed at the other end of the coagulation reaction tank 3, a sedimentation tank 5 installed at the other end of the flocculation reaction tank 4, and a filter tank 6 installed at the other end of the sedimentation tank 5. The electrolytic cell 1 includes an anode tank 11, one end of which is fixedly connected to and connected to an inlet pipe 12, and the other end of which is fixedly connected to and connected to an outlet pipe 13 connected to the neutralization reaction tank 2. A cathode roller 14 is rotatably connected to the top of the anode tank 11, one end of which is fixedly connected to a drive motor 15, the output shaft of the drive motor 15 is fixedly connected to a cleaning mechanism 16 that contacts the cathode roller 14, the other end of the cleaning mechanism 16 is fixedly connected to and connected to a centralized storage mechanism 17, and two filter mechanisms 18 are fixedly connected to and connected to the inlet pipe 12 and the outlet pipe 13, respectively, on the surface of the centralized storage mechanism 17.

[0032] like Figure 4-7As shown, the cleaning mechanism 16 includes a connecting circular box 161 fixedly connected to the top of the anode tank 11. A guide port 162 is provided on the upper surface of the connecting circular box 161. A first scraper 163 is fixedly connected to the inner wall of the guide port 162. The other end of the first scraper 163 passes through the guide port 162 and contacts the cathode roller 14. The length of the first scraper 163 is greater than the length of the cathode roller 14. The other end of the connecting circular box 161 is fixedly connected to and communicates with a first guide pipe 164, which is fixedly connected to and communicates with the centralized storage mechanism 17. An auger conveyor shaft 165 is rotatably connected to the inner wall of the connecting round box 161. The other end of the auger conveyor shaft 165 extends to the outside of the connecting round box 161. The other end of the auger conveyor shaft 165 and the output shaft of the drive motor 15 are both fixedly connected to a first sprocket 166. One of the first sprockets 166 has a first chain 167 meshing with the other first sprocket 166. The two first sprockets 166 are connected by the first chain 167. The lowest point of the connecting round box 161 and the first guide pipe 164 are connected to the connecting round box 161. The lowest point inside the connecting box 161 is flush with the bottom, and the diameter of the auger conveyor shaft 165 is the same as the inner diameter of the connecting box 161. A first filter screen 168 is embedded in the lower surface of the connecting box 161. The cross-sectional shape of the first filter screen 168 is arc-shaped, and the center point of the first filter screen 168 coincides with the axis of the auger conveyor shaft 165. The first filter screen 168 is positioned directly above the anode tank 11, and the size of the first filter screen 168 is smaller than the size of the anode tank 11. When metal atom deposits fall above the first filter screen 168, at this time... Water entrained in the metal atom deposits passes through the first filter screen 168 under the action of gravity and falls back into the interior of the anode tank 11. At the same time, the auger conveyor shaft 165 continuously tumbles and displaces the metal atom deposits, accelerating the rate at which water leaves the metal atom deposits. Two blocking blocks 169 are fixedly connected to the upper surface of the connecting round box 161, and both are fixedly connected to the first scraper 163. The blocking blocks 169 are symmetrically distributed on both sides of the feed inlet 162, and the height of the blocking blocks 169 is greater than the height of the first scraper 163.

[0033] like Figure 7As shown, the centralized storage mechanism 17 includes a mounting box 171 fixedly connected to the other end of the first guide pipe 164. One end of the mounting box 171 has a connecting cavity 172 communicating with the inner bottom wall of the mounting box 171. A first collection box 173 is inserted into the inner wall of the mounting box 171, and the other end of the first collection box 173 extends to the outside of the mounting box 171. A second filter screen 174 is embedded in the bottom of the first collection box 173. A second collection box 175 is inserted into the inner wall of the connecting cavity 172, and the other end of the second collection box 175 extends to the outside of the connecting cavity 172. An exhaust fan 176 is fixedly connected and communicated to the vertical inner wall of the connecting cavity 172, and the other end of the exhaust fan 176 is fixedly connected to the exhaust fan 176. A cyclone separator 177 is fixedly connected and connected to the cyclone separator 177. A third collection box 178 is inserted into the inner bottom wall of the cyclone separator 177, and the other end of the third collection box 178 extends to the outside of the cyclone separator 177. When the first guide pipe 164 and the second guide pipe 188 guide the waste into the installation box 171, the waste falls into the first collection box 173 under the action of gravity. At this time, the second filter screen 174 drains the water entrained in the waste. Then, the water enters the connecting cavity 172 under the action of gravity and falls into the second collection box 175. During this process, the exhaust fan 176 quickly draws out the air from the connecting cavity 172 and the installation box 171. At this time, the outside air is respectively... The material enters the connecting round box 161 and the mounting round box 181 through the feed inlet 162 and the filter box 189, respectively. Air is then guided into the first feed pipe 164 and the second feed pipe 188 from the connecting round box 161 and the mounting round box 181, respectively. The first feed pipe 164 and the second feed pipe 188 guide the air into the interior of the mounting box 171, ensuring that the air inside the mounting box 171 and the connecting cavity 172 remains balanced. Due to the continuous operation of the exhaust fan 176, the flowing air forms an airflow. This airflow through the connecting round box 161 and the first feed pipe 164 rapidly guides the metal atom deposit into the mounting box 171. The material is then transported through the mounting round box 181 and the first feed pipe 189. The airflow inside the second guide pipe 188 quickly guides solid impurities into the mounting box 171, which effectively reduces the probability of waste material retention inside the connecting round box 161, the first guide pipe 164, the mounting round box 181, and the second guide pipe 188. At the same time, the exhaust fan 176 guides the exhaust air into the cyclone separator 177. The cyclone separator 177 throws the water carried in the air onto the inner bottom wall of the cyclone separator 177. Then, the air that has lost moisture is discharged to the outside through the exhaust pipe of the cyclone separator 177. Meanwhile, the water on the inner wall of the cyclone separator 177 flows downward along the inner wall of the cyclone separator 177 under the action of gravity and is collected together by the third collection box 178.

[0034] like Figure 7-10As shown, one of the filtration mechanisms 18 includes a mounting box 181 fixedly connected to and communicating with the surface of the inlet pipe 12. A third filter screen 182 is embedded in the connection between the mounting box 181 and the inlet pipe 12 near the anode tank 11. A drive shaft 183 is rotatably connected to the inner wall of the mounting box 181. The other end of the drive shaft 183 extends to the outside of the mounting box 181. A second sprocket 184 is fixedly connected to the output shaft of the drive motor 15 at the other end of the drive shaft 183. A second chain 185 is meshed with the surface of one of the second sprockets 184 and meshes with the other second sprocket 184. The two second sprockets 184 are connected by a drive chain 185. A cylindrical filter screen 186 is rotatably connected to the surface of the drive shaft 183 and rotatably connected to the mounting box 181. A second scraper 187 distributed in a ring is fixedly connected to the surface of the cylindrical filter screen 186. One end of the filter screen 182 contacts the adjacent second scraper 187. One end of the mounting box 181 is fixedly connected to and communicates with the second guide pipe 188, which is fixedly connected to and communicates with the mounting box 171. The center point of the connection between the mounting box 181 and the second guide pipe 188 is set on the same horizontal line as the highest point of the cylindrical filter screen 186. The cross-sectional shape of the third filter screen 182 is arc-shaped, and the center point of the third filter screen 182 coincides with the axis of the drive shaft 183. The mounting box 181 in another filtration mechanism 18 is fixedly connected to and communicates with the surface of the liquid outlet pipe 13. The third filter screen 182 in another filtration mechanism 18 is embedded in the connection between the other mounting box 181 and the liquid outlet pipe 13 away from the anode tank 11. The cross-sectional shape of the cylindrical filter screen 186 is conical, and the diameter of the cylindrical filter screen 186 gradually decreases from the mounting box 181 to the second guide pipe 188.The other end of the mounting box 181 is fixedly connected to and communicates with a filter screen box 189. The filter screen box 189 and one end of the second feed pipe 188 are set on the same horizontal line. During the process of wastewater passing through the inlet pipe 12, the third filter screen 182 filters out solid impurities mixed in the wastewater, making the wastewater entering the anode tank 11 cleaner and reducing the interference of solid impurities on the normal operation of the anode tank 11 and the cathode roller 14. At the same time, it also makes the inside of the anode tank 11 cleaner. Meanwhile, the drive motor 15 drives the connected second sprocket 184 to rotate. The second sprocket 184 drives another second sprocket 184 to rotate through the connected second chain 185. The other second sprocket 184 drives the drive shaft. Rotation of drive shaft 183 drives the cylindrical filter screen 186 to rotate. The cylindrical filter screen 186 drives the second scraper 187 to scrape off the solid impurities adhering to the surface of the third filter screen 182. Adjacent second scrapers 187, in conjunction with the cylindrical filter screen 186 and the mounting box 181, convey the solid impurities upwards in an arc. When the solid impurities move above the wastewater, the wastewater carried within them is filtered by the cylindrical filter screen 186 and falls back into the wastewater below. When the solid impurities are moved to the connection point between the second guide pipe 188 and the mounting box 181, the airflow guides these solid impurities into the second guide pipe 188, which then guides them into the interior of the mounting box 171.

[0035] When the present invention is in use, after the worker transports the acidic heavy metal wastewater into the anode tank 11 through the inlet pipe 12, the heavy metal ions are reduced into heavy metal atoms under the action of the current. At this time, the anode inside the anode tank 11 pushes the heavy metal atoms in the wastewater toward the cathode roller 14. The heavy metal atoms are then deposited on the surface of the cathode roller 14. Then the remaining wastewater enters the outlet pipe 13 along the anode tank 11, and the outlet pipe 13 then guides the wastewater into the neutralization reaction tank 2.

[0036] During the deposition of heavy metal atoms on the surface of the cathode roller 14, the drive motor 15 drives the cathode roller 14 to rotate. At this time, the first scraper 163 scrapes off the heavy metal atom deposits on the surface of the cathode roller 14, keeping the surface of the cathode roller 14 clean. This ensures the effective contact area between the cathode roller 14 and the wastewater, which not only ensures the uniformity of the current on the surface of the cathode roller 14, but also allows the electrolytic cell 1 to maintain its original working efficiency. At the same time, it eliminates the need for staff to stop the machine for cleaning, thereby reducing the probability of the electrolytic cell 1 stopping and ensuring the normal working efficiency of the electrolytic cell 1.

[0037] During the process of scraping off heavy metal atomic deposits by the first scraper 163, the scraped heavy metal atomic deposits are guided into the connecting round box 161 through the feed inlet 162. At the same time, the drive motor 15 synchronously drives the connected first sprocket 166 to rotate. The first sprocket 166 drives another first sprocket 166 to rotate through the first chain 167. The other first sprocket 166 drives the auger conveyor shaft 165 to rotate. The auger conveyor shaft 165, in conjunction with the connecting round box 161, transports the metal atomic deposits into the first feed pipe 164. The first feed pipe 164 then guides the metal atomic deposits into the installation box 171. This ensures that the connecting round box 161 can always hold the metal atomic deposits, eliminating the need for staff to stop the machine for centralized cleaning, and further ensuring the operating efficiency of the electrolytic cell 1.

[0038] It should be noted that the anode tank 11, cathode roller 14, drive motor 15, exhaust fan 176, neutralization reaction tank 2, coagulation reaction tank 3, flocculation reaction tank 4, sedimentation tank 5, and filter tank 6 mentioned above are all devices with relatively mature existing technology. The specific models can be selected according to actual needs. At the same time, the power supply for the anode tank 11, cathode roller 14, drive motor 15, and exhaust fan 176 can be powered by the built-in power supply or by the mains power supply. The specific power supply method is selected according to the situation and will not be elaborated here.

[0039] like Figure 1-10 As shown, a method for treating acidic heavy metal river wastewater includes a treatment device for acidic heavy metal river wastewater as described above, and its operation steps are as follows:

[0040] First, the wastewater is fed into electrolytic cell 1. Under the action of electrolysis, the metal ions in the wastewater are reduced to metal atoms and separated from the wastewater.

[0041] 2. The wastewater from which heavy metal ions have been removed is transported into neutralization reaction tank 2, which contains alkali solution. The acidic substances in the wastewater react with the alkaline substances in the alkali solution to neutralize the wastewater until the pH value of the wastewater reaches a neutral value.

[0042] 3. The neutralized wastewater is transported into a coagulation reaction tank 3 containing flocculants. The flocculants coagulate water-soluble pollutants in the wastewater into tiny insoluble substances.

[0043] 4. The wastewater after being mixed with flocculant is transported into flocculation reaction tank 4 containing flocculant. The flocculant will coagulate the tiny insoluble substances in the wastewater into larger insoluble substances.

[0044] 5. The wastewater flocculated by the flocculant is transported to sedimentation tank 5, where larger insoluble substances in the wastewater settle under the action of gravity.

[0045] Six: The settled wastewater is transported to filter tank 6, which is equipped with a filtration device. The filtration device removes the insoluble substances mixed in with the wastewater, and then it can be discharged normally.

[0046] Furthermore, it should be understood that although this specification describes embodiments, not every embodiment contains only one independent technical solution. This narrative style is merely for clarity. Those skilled in the art should consider the specification as a whole, and the technical solutions in each embodiment can also be appropriately combined to form other embodiments that can be understood by those skilled in the art.

Claims

1. A treatment device for acidic heavy metal river wastewater, comprising an electrolytic cell (1), characterized in that: One end of the electrolytic cell (1) is equipped with a neutralization reaction tank (2), the other end of the neutralization reaction tank (2) is equipped with a coagulation reaction tank (3), the other end of the coagulation reaction tank (3) is equipped with a flocculation reaction tank (4), the other end of the flocculation reaction tank (4) is equipped with a sedimentation tank (5), and the other end of the sedimentation tank (5) is equipped with a filter tank (6). The electrolytic cell (1) includes an anode tank (11), one end of which is fixedly connected to and connected to an inlet pipe (12), and the other end of which is fixedly connected to and connected to an outlet pipe (13) connected to a neutralization reaction tank (2). A cathode roller (14) is rotatably connected to the top of the anode tank (11). A drive motor (15) is fixedly connected to one end of the cathode roller (14). A cleaning mechanism (16) that contacts the cathode roller (14) is fixedly connected to the output shaft of the drive motor (15). A centralized storage mechanism (17) is fixedly connected to the other end of the cleaning mechanism (16). Two filter mechanisms (18) are fixedly connected to and connected to the inlet pipe (12) and the outlet pipe (13) respectively. The cleaning mechanism (16) includes a connecting round box (161) fixedly connected to the top of the anode tank (11). The upper surface of the connecting round box (161) is provided with a guide port (162). A first scraper (163) is fixedly connected to the inner wall of the guide port (162). The other end of the first scraper (163) passes through the guide port (162) and contacts the cathode roller (14). The length of the first scraper (163) is greater than the length of the cathode roller (14). The other end of the connecting round box (161) is fixedly connected to and communicates with a centralized storage mechanism (17). The first guide tube (164) is rotatably connected to the inner wall of the connecting round box (161), and the other end of the auger conveying shaft (165) extends to the outside of the connecting round box (161). The other end of the auger conveying shaft (165) and the output shaft of the drive motor (15) are both fixedly connected to a first sprocket (166). The surface of one of the first sprockets (166) is meshed with a first chain (167) that meshes with the other first sprocket (166). The two first sprockets (166) are connected by the first chain (167). One of the filter mechanisms (18) includes a mounting box (181) fixedly connected to and communicating with the surface of the inlet pipe (12). A third filter screen (182) is embedded in the connection between the mounting box (181) and the inlet pipe (12) near the anode tank (11). A drive shaft (183) is rotatably connected to the inner wall of the mounting box (181). The other end of the drive shaft (183) extends to the outside of the mounting box (181). A second sprocket (184) is fixedly connected to the output shaft of the drive motor (15). A second chain (185) meshes with the surface of one of the second sprockets (184) and meshes with the other second sprocket (184). Two second sprockets (184) are connected by a second chain (185). The surface of the drive shaft (183) is rotatably connected to a cylindrical filter screen (186) that is rotatably connected to the mounting box (181). The surface of the cylindrical filter screen (186) is fixedly connected to a second scraper (187) that is distributed in a ring. One end of the third filter screen (182) is in contact with the adjacent second scraper (187). One end of the mounting box (181) is fixedly connected to and communicates with a second guide pipe (188) that is fixedly connected to and communicates with the mounting box (171). The center point of the connection between the mounting box (181) and the second guide pipe (188) is set on the same horizontal line as the highest point of the cylindrical filter screen (186).

2. The treatment device for acidic heavy metal river wastewater according to claim 1, characterized in that: The lowest point of the connection between the connecting round box (161) and the first guide tube (164) is flush with the lowest point inside the connecting round box (161), and the diameter of the auger conveyor shaft (165) is the same as the inner diameter of the connecting round box (161).

3. The treatment device for acidic heavy metal river wastewater according to claim 1, characterized in that: The lower surface of the connecting round box (161) is embedded with a first filter screen (168). The cross-sectional shape of the first filter screen (168) is arc-shaped. The center point of the first filter screen (168) coincides with the axis of the auger conveyor shaft (165). The first filter screen (168) is located directly above the anode groove (11). The size of the first filter screen (168) is smaller than the size of the anode groove (11).

4. The treatment device for acidic heavy metal river wastewater according to claim 1, characterized in that: The upper surface of the connecting round box (161) is fixedly connected with two blocking blocks (169), both of which are fixedly connected to the first scraper (163). The blocking blocks (169) are symmetrically distributed on both sides of the feed inlet (162), and the height of the blocking blocks (169) is greater than the height of the first scraper (163).

5. The treatment device for acidic heavy metal river wastewater according to claim 1, characterized in that: The centralized storage mechanism (17) includes a mounting box (171) fixedly connected to the other end of the first feed tube (164). One end of the mounting box (171) is provided with a connecting cavity (172) communicating with the bottom wall of the mounting box (171). A first collection box (173) is inserted into the inner wall of the mounting box (171). The other end of the first collection box (173) extends to the outside of the mounting box (171). A second filter screen (174) is embedded in the bottom of the first collection box (173). A second collection box (175) is inserted into the inner wall of the connecting cavity (172). The other end of the second collection box (175) extends to the outside of the connecting cavity (172).

6. The treatment device for acidic heavy metal river wastewater according to claim 5, characterized in that: The vertical inner wall of the connecting cavity (172) is fixedly connected to and connected to an exhaust fan (176). The other end of the exhaust fan (176) is fixedly connected to and connected to a cyclone separator (177). A third collection box (178) is inserted into the inner bottom wall of the cyclone separator (177). The other end of the third collection box (178) extends through to the outside of the cyclone separator (177).

7. The treatment device for acidic heavy metal river wastewater according to claim 1, characterized in that: The cross-sectional shape of the cylindrical filter screen (186) is conical, and the diameter of the cylindrical filter screen (186) gradually decreases from the mounting box (181) to the second guide tube (188).

8. The treatment device for acidic heavy metal river wastewater according to claim 1, characterized in that: The other end of the mounting box (181) is fixedly connected to and communicates with a filter screen box (189), and the filter screen box (189) and one end of the second guide tube (188) are set on the same horizontal line.

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