Electrolytic manganese wastewater treatment system

Abstract

The application relates to the technical field of wastewater treatment, and discloses an electrolytic manganese wastewater treatment system, which comprises a wastewater storage module, a detection module, a switching module, an ultragrain force ammonia removal module and a biochemical adjustment module. The wastewater storage module can store wastewater. The detection module is used for detecting the ammonia nitrogen concentration in the electrolytic manganese wastewater in the wastewater storage module. The switching module has an input port, a first output port and a second output port. The input port is in communication with the output end of the wastewater storage module. The ultragrain force ammonia removal module is provided with a wastewater outlet. The input end of the ultragrain force ammonia removal module is in communication with the first output port. The input end of the biochemical adjustment module is in communication with the second output port and the wastewater outlet. The electrolytic manganese wastewater with large ammonia nitrogen concentration fluctuation can be treated, and the treatment cost is reduced.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment equipment technology, specifically to an electrolytic manganese wastewater treatment system. Background Technology

[0002] Electrolytic manganese production generates a large amount of wastewater, the main pollutants of which are total manganese and ammonia nitrogen. This wastewater is characterized by high pollutant concentrations and complex composition. If discharged directly into water bodies without treatment, it will cause severe exceedances of pollutants such as total manganese and ammonia nitrogen, resulting in serious river pollution and ecological damage.

[0003] In related technologies, A / O (Anoxic / Oxic, biological denitrification) processes, stripping processes, chemical precipitation processes, and ion exchange processes are commonly used to treat ammonia nitrogen in wastewater. However, the ammonia nitrogen concentration in electrolytic manganese wastewater is high and fluctuates significantly, typically ranging from 200 mg / L to 3000 mg / L. None of the above-mentioned treatment processes can directly treat electrolytic manganese wastewater with such large fluctuations in ammonia nitrogen concentration; pretreatment or subsequent secondary treatment is required, which is costly. Utility Model Content

[0004] This application provides an electrolytic manganese wastewater treatment system that can treat electrolytic manganese wastewater with large fluctuations in ammonia nitrogen concentration and reduce treatment costs.

[0005] On the one hand, this application provides an electrolytic manganese wastewater treatment system, including a wastewater storage module, a detection module, a switching module, a high-gravity ammonia removal module, and a biochemical regulation module, the specific scheme of which is as follows.

[0006] Wastewater storage module, capable of storing wastewater;

[0007] The detection module is used to detect the ammonia nitrogen concentration in the electrolytic manganese wastewater in the wastewater storage module;

[0008] A switching module, which has an input port, a first output port, and a second output port, wherein the input port is connected to the output end of the wastewater storage module;

[0009] A supergravity ammonia removal module, wherein the supergravity ammonia removal module is provided with a wastewater outlet, and the input end of the supergravity ammonia removal module is connected to the first output port;

[0010] A biochemical regulation module, wherein the input end of the biochemical regulation module is connected to the second output port and the wastewater outlet.

[0011] Beneficial effects: First, electrolytic manganese wastewater is collected and stored in a wastewater storage module. Then, a detection module detects the ammonia nitrogen concentration in the electrolytic manganese wastewater. Based on whether the ammonia nitrogen concentration in the electrolytic manganese wastewater is greater than a set value (e.g., 400 mg / L), the connection state of the switching module is changed. Specifically, when the ammonia nitrogen concentration in the electrolytic manganese wastewater is greater than the set value, the input port of the switching module is connected to the first output port, so that the electrolytic manganese wastewater is first treated by the ultragravity deammoniation module to reduce the ammonia nitrogen content in the electrolytic manganese wastewater to below the set value. Then, it is treated by the biochemical adjustment module using the A / O process, so that the ammonia nitrogen content in the electrolytic manganese wastewater meets the standard and can be discharged.

[0012] For example, when the ammonia nitrogen concentration in the electrolytic manganese wastewater is less than the set value, the input port of the switching module is connected to the second output port, so that the electrolytic manganese wastewater is directly treated by the biochemical adjustment module using the A / O process, thereby ensuring that the ammonia nitrogen content in the electrolytic manganese wastewater meets the standard and is discharged.

[0013] By switching modules to select different treatment processes for electrolytic manganese wastewater with varying ammonia nitrogen concentrations, it is possible to treat electrolytic manganese wastewater with large fluctuations in ammonia nitrogen concentration and reduce treatment costs.

[0014] In an optional implementation, the switching module includes a first buffer pool, which is provided with an acid-base regulator addition port, an input port, a first output port, and a second output port.

[0015] In one optional embodiment, the ammonia removal module includes an ammonia removal separator, a first fan, and an absorption tower. The ammonia removal separator is provided with an ammonia outlet, a compressed air inlet, and a wastewater outlet. The ammonia outlet is connected to the gas inlet of the absorption tower, and the output of the first fan is connected to the compressed air inlet.

[0016] In one optional embodiment, the biochemical conditioning module includes a second blower and a biochemical conditioning tank, a hydrolysis acidification tank, an anaerobic tank, an aerobic tank, a secondary sedimentation tank, and a final sedimentation tank connected in sequence. The input end of the biochemical conditioning tank is connected to the wastewater outlet and the second output port, and the output end of the second blower is connected to the aerobic tank for aeration. The biochemical conditioning tank is provided with a conditioning agent port for adjusting the pH in the biochemical conditioning tank, and the anaerobic tank is provided with a nitrification liquid addition port for adding nitrification liquid.

[0017] In an optional embodiment, the biochemical conditioning module further includes a sludge tank and a second filter press. The secondary sedimentation tank is provided with a sludge discharge port. The input end of the sludge tank is connected to the sludge discharge port, and the output end of the sludge tank is connected to the input end of the second filter press. The second filter press is provided with a second filtrate outlet, which is connected to the final sedimentation tank; and / or, the secondary sedimentation tank is provided with a sludge discharge port, which is connected to the hydrolysis acidification tank.

[0018] In one optional embodiment, the aerobic tank is provided with a nitrification liquid outlet, which is connected to the nitrification liquid addition port.

[0019] In one optional embodiment, the wastewater storage module includes a liquid storage unit and a manganese removal unit. The output end of the liquid storage unit is connected to the input end of the manganese removal unit, and the output end of the manganese removal unit is connected to the input port. The liquid storage unit is used to store wastewater, and the manganese removal unit is used to remove manganese ions from the electrolytic manganese wastewater.

[0020] In an optional embodiment, the manganese removal unit includes a first filter press and a first reaction tank, a second reaction tank, and an inclined tube sedimentation tank connected in sequence. The input end of the first reaction tank is connected to the output end of the liquid storage unit. The inclined tube sedimentation tank is provided with a supernatant outlet and a sedimentation outlet. The first filter press is provided with a first filtrate outlet. The supernatant outlet is connected to the input port. The sedimentation outlet is connected to the input end of the first filter press. The first filtrate outlet is connected to the second reaction tank. The first reaction tank is provided with a precipitant addition port, and the second reaction tank is provided with a flocculant addition port.

[0021] In one optional embodiment, the liquid storage unit includes a second buffer tank and a third buffer tank, wherein the second buffer tank is used to store flushing water from the electrolysis workshop and the third buffer tank is used to store leachate from the tailings dam.

[0022] In an optional implementation, a controller is further included, which is connected to the switching module and the detection module. The controller is used to control a switching signal to the switching module based on the detection result of the detection module, so as to connect the input port with the first output port or the second output port. Attached Figure Description

[0023] To more clearly illustrate the technical solutions in the specific embodiments or related technologies of this application, the drawings used in the description of the specific embodiments or related technologies will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0024] Figure 1 This is a schematic diagram of an electrolytic manganese wastewater treatment system according to an embodiment of this application.

[0025] Explanation of reference numerals in the attached figures:

[0026] 1. Wastewater storage module; 2. Switching module; 3. Ultra-gravity ammonia removal module; 4. Biochemical regulation module;

[0027] 11. Liquid storage unit; 12. Manganese removal unit;

[0028] 111. Second buffer pool; 112. Third buffer pool;

[0029] 121. First reaction tank; 122. Second reaction tank; 123. Inclined tube settling tank; 124. First filter press; 1211. Precipitant addition port; 1221. Flocculant addition port; 1231. Supernatant outlet; 1232. Sediment outlet; 1241. First filtrate outlet;

[0030] 21. Input port; 22. First output port; 23. Second output port; 24. First buffer tank; 25. Acid-base regulator addition port;

[0031] 31. High-gravity ammonia removal separator; 311. Wastewater outlet; 312. Ammonia outlet; 313. Compressed air inlet; 32. First blower; 33. Absorption tower; 331. Dilute sulfuric acid inlet;

[0032] 41. Second blower; 42. Biological equalization tank; 421. Conditioner inlet; 43. Hydrolysis acidification tank; 44. Anaerobic tank; 441. Digestering liquid addition inlet; 45. Aerobic tank; 451. Nitrified liquid outlet; 46. Secondary sedimentation tank; 461. Sludge discharge outlet; 47. Final sedimentation tank; 48. Sludge tank; 49. Second filter press; 491. Second filtrate outlet. Detailed Implementation

[0033] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0034] In related technologies, electrolytic manganese production generates a large amount of electrolytic manganese wastewater. The main pollutants in this wastewater are total manganese and ammonia nitrogen, and the concentration of pollutants is high and the composition is complex. If it is discharged directly into water bodies without treatment, it will cause serious exceedances of pollutants such as total manganese and ammonia nitrogen, resulting in severe river pollution and damage to the ecological environment.

[0035] Ammonia nitrogen in wastewater is typically treated using A / O (Anoxic / Oxic, biological denitrification) processes, stripping processes, chemical precipitation processes, and ion exchange processes. However, the ammonia nitrogen concentration in electrolytic manganese wastewater is high and fluctuates significantly, typically ranging from 200 mg / L to 3000 mg / L. None of the aforementioned treatment processes can directly treat wastewater with such large fluctuations in ammonia nitrogen concentration.

[0036] To address the aforementioned issues, this application provides an electrolytic manganese wastewater treatment system that can treat electrolytic manganese wastewater with large fluctuations in ammonia nitrogen concentration and reduce treatment costs.

[0037] The following is combined with Figure 1 This describes an embodiment of the present application.

[0038] According to embodiments of this application, in one aspect, an electrolytic manganese wastewater treatment system is provided, such as... Figure 1 As shown, it includes a wastewater storage module 1, a detection module, a switching module 2, a high-gravity ammonia removal module 3, and a biochemical regulation module 4. The specific scheme is as follows.

[0039] Wastewater storage module 1 can store electrolytic manganese wastewater, which is convenient for collecting electrolytic manganese wastewater and processing it in batches. Specifically, the wastewater treatment module can be any container, as long as it can store electrolytic manganese wastewater.

[0040] The detection module is used to detect the ammonia nitrogen concentration in the electrolytic manganese wastewater in the wastewater storage module 1. Specifically, the detection module can be any one of an infrared ammonia nitrogen analyzer, a Karl Fischer volumetric ammonia nitrogen analyzer, or a Karl Fischer coulometric ammonia nitrogen analyzer, or other comprehensive measuring equipment with ammonia nitrogen concentration measurement function. More specifically, the detection module can detect the electrolytic manganese wastewater in the wastewater storage module 1, either at the output end of the wastewater storage module 1 or at the input end of the switching module 2.

[0041] like Figure 1 As shown, the switching module 2 has an input port 21, a first output port 22, and a second output port 23. The input port 21 is connected to the output end of the wastewater storage module 1.

[0042] like Figure 1As shown, the supergravity ammonia removal module 3 is equipped with a wastewater outlet 311, and the input end of the supergravity ammonia removal module 3 is connected to the first output port 22. Specifically, the supergravity ammonia removal module 3 utilizes the supergravity field to enhance the mass transfer and heat transfer process between gas and liquid, thereby achieving efficient separation and removal of ammonia nitrogen. It typically uses one or more high-speed rotating rotors, and the gas and liquid pass through the rotors in a counter-current spray manner to carry out material mass transfer.

[0043] like Figure 1 As shown, the input end of the biochemical regulation module 4 is connected to the second output port 23 and the wastewater outlet 311. Specifically, the biochemical regulation module 4 is a module that treats wastewater through the A / O process.

[0044] In specific wastewater treatment processes, such as Figure 1 As shown, the ammonia nitrogen concentration in the electrolytic manganese wastewater is detected by the detection module. When the ammonia nitrogen concentration in the electrolytic manganese wastewater is not less than 400 mg / L, the input port 21 of the switching module 2 is connected to the first output port 22, so that the electrolytic manganese wastewater first passes through the super gravity ammonia removal module 3 for ammonia removal treatment, so that the ammonia nitrogen concentration in the electrolytic manganese wastewater is reduced to below 400 mg / L. Then, the electrolytic manganese wastewater is treated by the biochemical regulation module 4 using the A / O process, so that the ammonia nitrogen content in the wastewater meets the standard before being discharged.

[0045] When the ammonia nitrogen concentration in the electrolytic manganese wastewater is less than 400 mg / L, the input port 21 of the switching module 2 is connected to the second output port 23, so that the electrolytic manganese wastewater is directly treated by the biochemical regulation module 4 using the A / O process, so that the ammonia nitrogen content in the wastewater meets the standard before being discharged.

[0046] In this embodiment, such as Figure 1 As shown, electrolytic manganese wastewater is first collected and stored in wastewater storage module 1. Then, the ammonia nitrogen concentration in the electrolytic manganese wastewater is detected by a detection module. Based on whether the ammonia nitrogen concentration in the electrolytic manganese wastewater is greater than a set value (e.g., 400 mg / L), the connection state of switching module 2 is changed. Specifically, when the ammonia nitrogen concentration in the electrolytic manganese wastewater is greater than the set value, the input port 21 of switching module 2 is connected to the first output port 22, so that the electrolytic manganese wastewater is first treated by the ultragravity deammoniation module 3 to reduce the ammonia nitrogen content in the electrolytic manganese wastewater to below the set value. Then, it is treated by the biochemical adjustment module 4 using the A / O process, so that the ammonia nitrogen content in the electrolytic manganese wastewater meets the standard and is discharged.

[0047] For example, when the ammonia nitrogen concentration in the electrolytic manganese wastewater is less than the set value, the input port 21 of the switching module 2 is connected to the second output port 23, so that the electrolytic manganese wastewater is directly treated by the biochemical adjustment module 4 using the A / O process, thereby ensuring that the ammonia nitrogen content in the electrolytic manganese wastewater meets the standard and is discharged.

[0048] By switching module 2, different treatment processes can be selected for electrolytic manganese wastewater with different ammonia nitrogen concentrations, which can treat electrolytic manganese wastewater with large fluctuations in ammonia nitrogen concentration and reduce treatment costs.

[0049] In one embodiment, such as Figure 1 As shown, the switching module 2 includes a first buffer tank 24, which is provided with an acid-base regulator addition port 25, an input port 21, a first output port 22, and a second output port 23. Specifically, the volume of the first buffer tank 24 can be selected and set according to actual needs. Valves can be installed on the first and second output ports 23 to control their opening and closing.

[0050] In this embodiment, the first buffer tank 24 is equipped with an acid-base regulator addition port 25. If the ammonia nitrogen content in the electrolytic manganese wastewater exceeds the set value, a pH regulator, such as sodium hydroxide, is added to adjust the pH value of the electrolytic manganese wastewater to about 11.5, so that the solid ammonium in the electrolytic manganese wastewater is converted into free ammonia, which facilitates subsequent ultragravity deammoniation separation.

[0051] In one embodiment, such as Figure 1 As shown, the ammonia removal module 3 under high gravity includes an ammonia removal separator 31, a first blower 32, and an absorption tower 33. The ammonia removal separator 31 under high gravity is provided with an ammonia outlet 312, a compressed air inlet 313, and a wastewater outlet 311. The ammonia outlet 312 is connected to the gas inlet of the absorption tower 33, and the output end of the first blower 32 is connected to the compressed air inlet 313.

[0052] In this embodiment, the high-gravity ammonia removal separator 31 separates the electrolytic manganese wastewater into fine water droplets through high-speed rotation. These droplets then come into full contact with the compressed gas introduced into the high-gravity ammonia removal separator 31 by the first blower 32 for atomization, thereby separating the free ammonia from the electrolytic manganese wastewater. The separated ammonia gas is then absorbed by sulfuric acid solution in the absorption tower 33 and finally produced as ammonium sulfate for reuse in the upstream workshop. The separated electrolytic manganese wastewater with reduced concentration is then fed into the biochemical adjustment module 4 for further treatment.

[0053] In one embodiment, such as Figure 1 As shown, the biochemical conditioning module 4 includes a second blower 41 and a biochemical conditioning tank 42, a hydrolysis acidification tank 43, an anaerobic tank 44, an aerobic tank 45, a secondary sedimentation tank 46, and a final sedimentation tank 47 connected in sequence. The input end of the biochemical conditioning tank 42 is connected to the wastewater outlet 311 and the second output port 23. The output end of the second blower 41 is connected to the aerobic tank 45 for aeration. The biochemical conditioning tank 42 is provided with a conditioning agent port 421 for adjusting the pH in the biochemical conditioning tank 42. The anaerobic tank 44 is provided with a nitrification liquid addition port for adding nitrification liquid.

[0054] In practical use, electrolytic manganese wastewater that has been treated by the supergravity deammoniation process, or electrolytic manganese wastewater with an ammonia nitrogen concentration lower than the set value, is introduced into the biological conditioning tank 42. Acid is added through the conditioning agent port 421 to adjust the pH of the wastewater to about 8.5. After the pH is adjusted, the electrolytic manganese wastewater enters the biological A2O system for treatment. The ammonia nitrogen in the electrolytic manganese wastewater is converted into nitrogen gas through nitrification and denitrification in the biological system and finally overflows from the system. The ammonia nitrogen in the wastewater meets the discharge standards.

[0055] In one embodiment, such as Figure 1 As shown, the biochemical adjustment module 4 also includes a sludge tank 48 and a second filter press 49. A sludge discharge port 461 is provided on the secondary sedimentation tank 46. The input end of the sludge tank 48 is connected to the sludge discharge port 461, and the output end of the sludge tank 48 is connected to the input end of the second filter press 49. A second filtrate outlet 491 is provided on the second filter press 49, and the second filtrate outlet 491 is connected to the final sedimentation tank 47. In this embodiment, by setting up the sludge tank 48 and the second filter press 49, the sludge settled in the secondary sedimentation tank 46 can be treated.

[0056] And / or, the secondary sedimentation tank 46 is provided with a sludge discharge port 461, which is connected to the hydrolysis acidification tank 43. In this embodiment, by directly connecting the sludge discharge port 461 to the hydrolysis acidification tank 43, the sludge can be returned to the hydrolysis acidification tank 43 for secondary utilization.

[0057] In one embodiment, such as Figure 1 As shown, the aerobic tank 45 is provided with a nitrification liquid outlet 451, which is connected to the nitrification liquid addition port. In this embodiment, by connecting the nitrification liquid outlet 451 on the aerobic tank 45 to the nitrification liquid addition port on the anaerobic tank 44, the nitrification liquid generated in the aerobic tank 45 can be returned to the anaerobic tank 44 for secondary utilization.

[0058] In one embodiment, such as Figure 1 As shown, the wastewater storage module 1 includes a liquid storage unit 11 and a manganese removal unit 12. The output end of the liquid storage unit 11 is connected to the input end of the manganese removal unit 12, and the output end of the manganese removal unit 12 is connected to the input port 21. The liquid storage unit 11 is used to store wastewater, and the manganese removal unit 12 is used to remove manganese ions from the electrolytic manganese wastewater.

[0059] Specifically, the process for removing manganese ions from electrolytic manganese wastewater is by precipitation; of course, other processes such as electrolysis and ion exchange can also be used.

[0060] In this embodiment, the manganese ions in the electrolytic manganese wastewater are first removed by the manganese removal unit 12, and then the subsequent ammonia removal and nitrogenization treatment is carried out. The process is simple and can simplify the subsequent treatment process.

[0061] In one embodiment, such as Figure 1 As shown, the manganese removal unit 12 includes a first filter press 124 and a first reaction tank 121, a second reaction tank 122, and an inclined tube sedimentation tank 123 connected in sequence. The input end of the first reaction tank 121 is connected to the output end of the storage unit 11. The inclined tube sedimentation tank 123 is provided with a supernatant outlet 1231 and a sedimentation outlet 1232. The first filter press 124 is provided with a first filtrate outlet 1241. The supernatant outlet 1231 is connected to the input port 21. The sedimentation outlet 1232 is connected to the input end of the first filter press 124. The first filtrate outlet 1241 is connected to the second reaction tank 122. The first reaction tank 121 is provided with a precipitant addition port 1211, and the second reaction tank 122 is provided with a flocculant addition port 1221.

[0062] In the specific treatment process, sodium carbonate is added to the first reaction tank 121 through the precipitant addition port 1211 to adjust the pH of the electrolytic manganese wastewater to 10.5, and to allow Mn, Mg, and Ca metal ions to combine with carbonate ions to produce carbonate precipitates, thereby removing them from the water.

[0063] Flocculant is added to the second reaction tank 122 through flocculant addition port 1221, causing the generated precipitate to settle and separate rapidly. Then, it is introduced into the inclined tube sedimentation device, and the supernatant enters the switching module 2 for further treatment. At this time, the Mn concentration in the supernatant has reached the national emission standard. The carbonate precipitate is discharged through the bottom of the inclined tube sedimentation tank and enters the first filter press 124 for compression. The filter cake is then pulled back to the upstream workshop for recycling.

[0064] In one embodiment, such as Figure 1 As shown, the liquid storage unit 11 includes a second buffer tank 111 and a third buffer tank 112. The second buffer tank 111 is used to store the flushing water of the electrolysis workshop, and the third buffer tank 112 is used to store the leachate from the tailings dam.

[0065] In specific applications, the wastewater from the electrolytic manganese industry mainly comes from the flushing water of the electrolytic workshop and the leachate from the tailings dam. The ammonia nitrogen in the flushing water of the electrolytic workshop is usually between 200 mg / L and 400 mg / L; the ammonia nitrogen in the leachate from the tailings dam is between 1000 mg / L and 2000 mg / L. By setting up a second buffer tank 111 and a third buffer tank 112 to store the flushing water of the electrolytic workshop and the leachate from the tailings dam separately, the amount of electrolytic manganese wastewater with an ammonia nitrogen content higher than the set value can be reduced, and the amount of electrolytic manganese wastewater treated by the ultragravity deammoniation module 3 can be reduced, thereby reducing the treatment cost.

[0066] In one embodiment, such as Figure 1As shown, it also includes a controller, which is connected to the switching module 2 and the detection module. The controller is used to control the switching module 2 to switch the input port 21 with the first output port 22 or the second output port 23 according to the detection result of the detection module.

[0067] Specifically, the controller can be a microcontroller, a computer host, or other unit with logic processing capabilities.

[0068] In this embodiment, the controller sends a switching signal to the switching module 2 based on the detection results of the detection module, so as to connect the input port 21 with the first output port 22 or the second output port 23. This is highly intelligent and can reduce manpower.

[0069] The above solution will be fully described below with a specific embodiment.

[0070] This embodiment provides an electrolytic manganese wastewater treatment system, such as... Figure 1 As shown, it includes a wastewater storage module 1, a detection module, a switching module 2, a high-gravity ammonia removal module 3, a biochemical regulation module 4, and a controller. The specific scheme is as follows.

[0071] Wastewater storage module 1 can store electrolytic manganese wastewater, which is convenient for collecting electrolytic manganese wastewater and processing it in batches. Specifically, the wastewater treatment module can be any container, as long as it can store electrolytic manganese wastewater.

[0072] More specifically, the wastewater storage module 1 includes a liquid storage unit 11 and a manganese removal unit 12. The output end of the liquid storage unit 11 is connected to the input end of the manganese removal unit 12, and the output end of the manganese removal unit 12 is connected to the input port 21. The liquid storage unit 11 is used to store wastewater, and the manganese removal unit 12 is used to remove manganese ions from the electrolytic manganese wastewater.

[0073] The liquid storage unit 11 includes a second buffer tank 111 and a third buffer tank 112. The second buffer tank 111 is used to store the flushing water of the electrolysis workshop, and the third buffer tank 112 is used to store the leachate from the tailings dam.

[0074] The manganese removal unit 12 includes a first filter press 124 and a first reaction tank 121, a second reaction tank 122, and an inclined tube sedimentation tank 123 connected in sequence. The input end of the first reaction tank 121 is connected to the output end of the storage unit 11. The inclined tube sedimentation tank 123 is provided with a supernatant outlet 1231 and a sedimentation outlet 1232. The first filter press 124 is provided with a first filtrate outlet 1241. The supernatant outlet 1231 is connected to the input port 21. The sedimentation outlet 1232 is connected to the input end of the first filter press 124. The first filtrate outlet 1241 is connected to the second reaction tank 122. The first reaction tank 121 is provided with a precipitant addition port 1211, and the second reaction tank 122 is provided with a flocculant addition port 1221.

[0075] The detection module is used to detect the ammonia nitrogen concentration in the electrolytic manganese wastewater in the wastewater storage module 1. Specifically, the detection module can be any one of an infrared ammonia nitrogen analyzer, a Karl Fischer volumetric ammonia nitrogen analyzer, or a Karl Fischer coulometric ammonia nitrogen analyzer, or other comprehensive measuring equipment with ammonia nitrogen concentration measurement function. More specifically, the detection module can detect the electrolytic manganese wastewater in the wastewater storage module 1, either at the output end of the wastewater storage module 1 or at the input end of the switching module 2.

[0076] The switching module 2 has an input port 21, a first output port 22, and a second output port 23. The input port 21 is connected to the output end of the wastewater storage module 1.

[0077] More specifically, the switching module 2 includes a first buffer pool 24, which is provided with an acid-base regulator addition port 25, an input port 21, a first output port 22, and a second output port 23. Specifically, the volume of the first buffer pool 24 can be selected and set according to actual needs; valves can be installed on the first and second output ports 23 to control their opening and closing.

[0078] The ammonia removal module 3 is equipped with a wastewater outlet 311, and the input end of the ammonia removal module 3 is connected to the first output port 22.

[0079] More specifically, the ammonia removal module 3 includes an ammonia removal separator 31, a first blower 32, and an absorption tower 33. The ammonia removal separator 31 is equipped with an ammonia outlet 312, a compressed air inlet 313, and a wastewater outlet 311. The ammonia outlet 312 is connected to the gas inlet of the absorption tower 33, and the output end of the first blower 32 is connected to the compressed air inlet 313.

[0080] The biochemical regulation module 4 has its input end connected to the second output port 23 and the wastewater outlet 311. Specifically, the biochemical regulation module 4 is a module that treats wastewater through the A / O process.

[0081] More specifically, the biochemical conditioning module 4 includes a second blower 41, a sludge tank 48, a second filter press 49, and a biochemical conditioning tank 42, a hydrolysis acidification tank 43, an anaerobic tank 44, an aerobic tank 45, a secondary sedimentation tank 46, and a final sedimentation tank 47 connected in sequence. The input end of the biochemical conditioning tank 42 is connected to the wastewater outlet 311 and the second output port 23. The output end of the second blower 41 is connected to the aerobic tank 45 for aeration. The biochemical conditioning tank 42 is equipped with a conditioning agent port 421 for adjusting the pH in the biochemical conditioning tank 42. The anaerobic tank 44 is equipped with a nitrification liquid addition port for adding nitrification liquid.

[0082] The secondary sedimentation tank 46 is provided with a sludge discharge port 461. The input end of the sludge tank 48 is connected to the sludge discharge port 461, and the output end of the sludge tank 48 is connected to the input end of the second filter press 49. The second filter press 49 is provided with a second filtrate outlet 491, and the second filtrate outlet 491 is connected to the final sedimentation tank 47. In this embodiment, by setting up the sludge tank 48 and the second filter press 49, the sludge settled in the secondary sedimentation tank 46 can be treated; and / or, the sludge discharge port 461 is connected to the hydrolysis acidification tank 43.

[0083] The aerobic tank 45 is provided with a nitrification liquid outlet 451, which is connected to the nitrification liquid addition port. In this embodiment, by connecting the nitrification liquid outlet 451 on the aerobic tank 45 to the nitrification liquid addition port on the anaerobic tank 44, the nitrification liquid generated in the aerobic tank 45 can be returned to the anaerobic tank 44 for secondary use.

[0084] The controller is connected to the switching module 2 and the detection module. Based on the detection results from the detection module, the controller sends a switching signal to the switching module 2 to connect the input port 21 to either the first output port 22 or the second output port 23. Specifically, the controller can be a microcontroller, a computer host, or other unit with logic processing capabilities.

[0085] The specific usage process is as follows, such as Figure 1 As shown.

[0086] S1. The electrolytic manganese wastewater is diverted into the second buffer tank 111 and the third buffer tank 112 according to the flushing water of the electrolysis workshop and the seepage liquid of the tailings dam. The second buffer tank 111 and the third buffer tank 112 are designed to store one day's worth of water for water quality homogenization and adjustment.

[0087] S2. Conduct water quality testing on the wastewater in the second buffer tank 111 and the third buffer tank 112 to determine the concentrations of Mn and ammonia nitrogen in the wastewater. Generally, the Mn ion concentration in the second buffer tank 111 is usually between 400 mg / L and 600 mg / L, and the ammonia nitrogen concentration is between 200 mg / L and 400 mg / L. The Mn ion concentration in the tailings dam leachate is between 1000 mg / L and 3000 mg / L, and the ammonia nitrogen concentration is between 1000 mg / L and 2000 mg / L.

[0088] S3. Prepare in advance a 10% sodium carbonate solution, a 30% liquid alkali solution, and a 2‰ polyacrylamide solution.

[0089] S4. Electrolytic manganese wastewater with an ammonia nitrogen concentration higher than 400 mg / L (electrolytic manganese wastewater in the third buffer tank 112) is pumped into the first reaction tank 121 via a booster pump. At the same time, sodium carbonate is added through the precipitant addition port 1211 using a dosing pump. Under the stirring of the agitator, the electrolytic manganese wastewater and sodium carbonate are quickly mixed, and the pH is adjusted to 9.5. Carbonate ions combine with manganese ions to produce manganese carbonate, thereby precipitating manganese from the wastewater.

[0090] S5. Electrolytic manganese wastewater flows from the first reaction tank 121 into the second reaction tank 122. Sodium hydroxide solution is added to the second reaction tank 122 through the flocculant addition port 1221. Under the stirring of the agitator, the electrolytic manganese wastewater and sodium hydroxide are quickly mixed. At the same time, the pH is adjusted to 10.5 so that the residual manganese and other metal ions in the water can further react with hydroxide ions to produce metal hydroxide precipitates that are separated from the water.

[0091] S6. Simultaneously, flocculant is added to the second reaction tank 122 to cause the manganese carbonate and other metal precipitates in the electrolytic manganese wastewater to flocculate from fine particles into large flocs, thereby accelerating the sedimentation rate of manganese carbonate and other metal precipitates.

[0092] S7. The turbid liquid of electrolytic manganese wastewater flows by gravity from the second reaction tank 122 into the inclined tube sedimentation tank 123. Under the action of gravity and inclined tube sedimentation, the precipitate in the turbid liquid settles rapidly and sinks into the cone at the bottom of the inclined tube sedimentation tank 123. The separated supernatant is discharged from the supernatant outlet 1231 at the top of the inclined tube sedimentation tank 123.

[0093] S8. The sludge in the cone hopper at the bottom of the inclined tube sedimentation tank flows out from the sedimentation outlet 1232 and is pumped into the first filter press 124 for sludge-water separation by the sludge pump. The sludge cake separated by the first filter press 124 is mainly composed of manganese carbonate. The sludge cake is returned to the upstream workshop for reuse, and the filtrate of the first filter press 124 is returned to the second reaction tank 122.

[0094] S9. Electrolytic manganese wastewater flowing from the supernatant outlet 1231 at the top of the inclined tube settling tank 123 flows into the first buffer tank 24. It is then classified and treated according to the ammonia nitrogen test results of the raw water.

[0095] S10. When the raw water test result shows that the ammonia nitrogen concentration is >400mg / L, after the electrolytic manganese wastewater enters the first buffer tank 24, sodium hydroxide solution is added to the first buffer tank 24 through the acid-base regulator addition port 25 to adjust the pH of the electrolytic manganese wastewater to about 11.5-12, so that the ammonium in the electrolytic manganese wastewater is converted into free ammonia under alkaline conditions.

[0096] S11. Electrolytic manganese wastewater is pumped from the first buffer tank 24 into the high-gravity ammonia removal separator 31 via a centrifugal pump. The electrolytic manganese wastewater flows from top to bottom and is evenly distributed by the liquid distribution device. Inside the high-gravity ammonia removal separator 31, the electrolytic manganese wastewater is evenly thrown out by high-speed centrifugal force. After passing through the packing layer, the ammonia-containing wastewater flows downward. A large amount of air is continuously supplied to the stripping tower by the first blower 32. The gas and liquid are fully contacted in the equipment. Under alkaline conditions and the action of aerodynamics, the partial pressure of ammonia in the wastewater can be reduced to the maximum extent, and the transfer rate of free ammonia from the wastewater can be accelerated. The free ammonia dissolved in the water passes through the gas-liquid interface and transfers to the gas phase, so that the free ammonia content in the water gradually decreases, thereby achieving the purpose of removing ammonia nitrogen.

[0097] S12. The ammonia-containing gas escaping from the top of the supergravity ammonia removal separator 31 enters the absorption tower 33. The absorption tower 33 uses 50% sulfuric acid as the absorbent. The absorbent enters the top of the absorption tower 33 through the dilute sulfuric acid inlet 331 via a circulating pump and is sprayed from top to bottom. When passing through the packing layer of the absorption tower 33, the contact area between the sulfuric acid solution and the ammonia-containing gas is increased.

[0098] S13. The ammonia-containing gas comes into countercurrent contact with the sulfuric acid solution flowing from top to bottom in the absorption tower 33, causing all the ammonia in the gas phase to be converted into ammonium sulfate solution. The concentration of ammonium sulfate in the absorption liquid is detected. Once the specified concentration is reached, the gas is discharged from the absorption tower 33, and the sulfuric acid solution is replenished. The ammonium sulfate solution is sent back to the upstream workshop for reuse. At the same time, the excess gas is discharged in compliance with standards through the chimney at the top of the tail gas tower.

[0099] S14. The electrolyte wastewater after ammonia removal flows out from the bottom of the super gravity ammonia removal separator 31. At this time, the ammonia nitrogen concentration in the wastewater is less than 300 mg / L. The wastewater is pumped into the biochemical conditioning tank 42 by a booster pump, and the pH of the wastewater is adjusted to 8.5 by adding dilute sulfuric acid through the conditioning agent port 421.

[0100] S15. After pH adjustment, the wastewater enters the hydrolysis acidification tank 43 via a booster pump. In the hydrolysis acidification tank 43, it mixes with the water in the system to neutralize the influent ammonia nitrogen concentration. In the hydrolysis acidification tank 43, the large molecular organic matter in the wastewater is further decomposed, and the organic nitrogen is ammonified.

[0101] S16. Wastewater enters the anaerobic tank 44 from the hydrolysis acidification tank 43. The dissolved oxygen in the anaerobic tank 44 is controlled below 0.2 mg / L. In the anaerobic tank 44, nitrate nitrogen in the water is converted into nitrogen gas by denitrifying bacteria. During this process, organic matter in the water is decomposed and utilized. At the same time, the COD (Chemical Oxygen Demand) of the wastewater can be reduced. This process will also produce a certain amount of alkalinity.

[0102] S17. Wastewater flows from anaerobic tank 44 into aerobic tank 45. Aerobic tank 45 is aerated by a second blower 41 to control dissolved oxygen at 2 mg / L to 4 mg / L. Under the action of nitrifying bacteria in aerobic tank 45, NH3 is reduced... 4+ Oxidized to NO 2- and NO 3- At the same time, it consumes the alkalinity produced in anaerobic pond 44.

[0103] S18. The nitrified water is returned to the anaerobic tank 44 via the return pump at the end of the aerobic tank 45. The return ratio is controlled at 150% to 200% for denitrification.

[0104] After the mixed liquor from S19 and aerobic tank 45 enters the secondary sedimentation tank 46, it undergoes sludge-water separation through vortex flow. The supernatant flows into the final sedimentation tank 47 through the overflow weir, while the mixed liquor with higher sludge concentration at the bottom flows back to the hydrolysis acidification tank 43 through the sludge discharge port 461 to ensure the sludge concentration of the system. Alternatively, depending on the sludge concentration of the system, it can be discharged into the sludge tank 48 and discharged from the system through filter press dewatering.

[0105] The wastewater in S20 and final sedimentation tank 47 was ultimately discharged in compliance with standards.

[0106] S21. When the ammonia nitrogen concentration in the raw water is <400mg / L (such as the electrolytic manganese wastewater in the second buffer tank 111), the wastewater directly enters the biological treatment system after passing through steps S1 to S9 and then directly enters the biological treatment system starting from step S14; finally, the manganese and ammonia nitrogen in the system meet the discharge standards.

[0107] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and all such modifications and variations fall within the scope defined by the appended claims.

Claims

1. A wastewater treatment system for electrolytic manganese, characterized in that, include: Wastewater storage module (1) is capable of storing wastewater; The detection module is used to detect the ammonia nitrogen concentration in the electrolytic manganese wastewater in the wastewater storage module (1); The switching module (2) has an input port (21), a first output port (22) and a second output port (23), and the input port (21) is connected to the output end of the wastewater storage module (1); A super gravity ammonia removal module (3) is provided with a wastewater outlet (311), and the input end of the super gravity ammonia removal module (3) is connected to the first output port (22); The biochemical regulation module (4) is connected to the second output port (23) and the wastewater outlet (311) at its input end.

2. The electrolytic manganese wastewater treatment system according to claim 1, characterized in that, The switching module (2) includes a first buffer pool (24), which is provided with an acid-base regulator addition port (25), an input port (21), a first output port (22) and a second output port (23).

3. The electrolytic manganese wastewater treatment system according to claim 1, characterized in that, The supergravity ammonia removal module (3) includes a supergravity ammonia removal separator (31), a first fan (32), and an absorption tower (33). The supergravity ammonia removal separator (31) is provided with an ammonia outlet (312), a compressed air inlet (313), and a wastewater outlet (311). The ammonia outlet (312) is connected to the gas input end of the absorption tower (33), and the output end of the first fan (32) is connected to the compressed air inlet (313).

4. The electrolytic manganese wastewater treatment system according to any one of claims 1 to 3, characterized in that, The biochemical conditioning module (4) includes a second blower (41) and a biochemical conditioning tank (42), a hydrolysis acidification tank (43), an anaerobic tank (44), an aerobic tank (45), a secondary sedimentation tank (46), and a final sedimentation tank (47) connected in sequence. The input end of the biochemical conditioning tank (42) is connected to the wastewater outlet (311) and the second output port (23). The output end of the second blower (41) is connected to the aerobic tank (45) for aeration. The biochemical conditioning tank (42) is provided with a regulator port (421) for adjusting the pH in the biochemical conditioning tank (42). The anaerobic tank (44) is provided with a nitrification liquid addition port for adding nitrification liquid.

5. The electrolytic manganese wastewater treatment system according to claim 4, characterized in that, The biochemical regulation module (4) also includes a sludge tank (48) and a second filter press (49). The secondary sedimentation tank (46) is provided with a sludge discharge port (461). The input end of the sludge tank (48) is connected to the sludge discharge port (461). The output end of the sludge tank (48) is connected to the input end of the second filter press (49). The second filter press (49) is provided with a second filtrate outlet (491). The second filtrate outlet (491) is connected to the final sedimentation tank (47). And / or, the secondary sedimentation tank (46) is provided with a sludge discharge port (461), which is connected to the hydrolysis acidification tank (43).

6. The electrolytic manganese wastewater treatment system according to claim 4, characterized in that, The aerobic tank (45) is provided with a nitrification liquid outlet (451), which is connected to the nitrification liquid addition port.

7. The electrolytic manganese wastewater treatment system according to any one of claims 1 to 3, characterized in that, The wastewater storage module (1) includes a liquid storage unit (11) and a manganese removal unit (12). The output end of the liquid storage unit (11) is connected to the input end of the manganese removal unit (12), and the output end of the manganese removal unit (12) is connected to the input port (21). The liquid storage unit (11) is used to store wastewater, and the manganese removal unit (12) is used to remove manganese ions from electrolytic manganese wastewater.

8. The electrolytic manganese wastewater treatment system according to claim 7, characterized in that, The manganese removal unit (12) includes a first filter press (124) and a first reaction tank (121), a second reaction tank (122), and an inclined tube sedimentation tank (123) connected in sequence. The input end of the first reaction tank (121) is connected to the output end of the liquid storage unit (11). The inclined tube sedimentation tank (123) is provided with a supernatant outlet (1231) and a sedimentation outlet (1232). The first filter press (124) is provided with a first filtrate outlet (1241). The supernatant outlet (1231) is connected to the input port (21). The sedimentation outlet (1232) is connected to the input end of the first filter press (124). The first filtrate outlet (1241) is connected to the second reaction tank (122). The first reaction tank (121) is provided with a precipitant addition port (1211). The second reaction tank (122) is provided with a flocculant addition port (1221).

9. The electrolytic manganese wastewater treatment system according to claim 7, characterized in that, The liquid storage unit (11) includes a second buffer tank (111) and a third buffer tank (112). The second buffer tank (111) is used to store the flushing water of the electrolysis workshop, and the third buffer tank (112) is used to store the tailings dam leakage liquid.

10. The electrolytic manganese wastewater treatment system according to any one of claims 1 to 3, characterized in that, It also includes a controller, which is connected to the switching module (2) and the detection module. The controller is used to control the switching module (2) to switch according to the detection result of the detection module, so as to connect the input port (21) with the first output port (22) or the second output port (23).

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