A pH adjustment treatment system for arsenic-containing wastewater

Abstract

This utility model discloses a pH adjustment and treatment system for arsenic-containing wastewater, including an adjustment tank and a storage tank connected to the top of the adjustment tank by a drug inlet pipe. An inlet pipe and an outlet pipe are connected to the top of one side and the other side of the adjustment tank, respectively. A detection tube arranged in an inverted L-shape is installed inside the adjustment tank. The horizontal section of the detection tube, away from the vertical section, is connected to the inlet pipe. An outlet is located at the bottom of the vertical section. One side of the vertical section is fitted to the inner wall of the other side of the adjustment tank. A front pH meter with a probe inserted into the vertical section of the detection tube is detachably connected to the adjustment tank. A middle pH meter and a rear pH meter with probes located inside the adjustment tank and separated by a second filter screen are detachably connected sequentially at the top and rear of the adjustment tank. The middle pH meter is covered by a cleaning component and a bottom cover. A lifting mechanism for driving the cleaning component to rise and fall is installed on the top of the adjustment tank. An opening for the first filter screen is located at the top of the bottom cover. The system offers high overall adjustment accuracy, long probe lifespan, and easy probe disassembly, replacement, and cleaning.

Description

Technical Field

[0001] This utility model belongs to the field of arsenic-containing wastewater treatment technology, and more specifically, it relates to a pH adjustment treatment system for arsenic-containing wastewater. Background Technology

[0002] In recent years, the serious harm caused by arsenic-containing wastewater has become increasingly prominent, and the world has begun to pay more attention to this environmental problem. Arsenic and its compounds are highly toxic carcinogens. Therefore, if arsenic-containing wastewater is discharged directly without treatment, it can easily cause serious harm to human health and the ecological environment. At present, the commonly used method for arsenic removal in arsenic-containing wastewater is chemical precipitation. Among them, lime slurry is widely used for pH adjustment of arsenic-containing wastewater due to its low cost and good precipitate stability. Lime slurry is added to the wastewater according to the measured acidity or alkalinity and stirred to ensure that the lime slurry and wastewater are fully mixed and reacted to remove arsenic from the wastewater.

[0003] Existing methods for pH adjustment of arsenic-containing wastewater using lime slurry often employ a single pH meter to monitor a single point within the equalization tank. pH changes are manually monitored, and lime slurry is added based on experience. However, due to the considerable length of the equalization tank, manual monitoring and experience-based addition are prone to delays, leading to significant pH fluctuations and adjustment errors, resulting in low adjustment accuracy. Furthermore, current methods typically place the pH meter probe directly into the wastewater storage tank. During agitation, the rapid flow of the solution impacts the probe, and since the probe is usually fixed within the equalization tank, disassembly, replacement, and cleaning are inconvenient. Over time, suspended solids and scale from the wastewater can contaminate the probe, causing measurement distortion or probe corrosion, affecting overall adjustment accuracy and probe lifespan. In short, these methods suffer from low overall adjustment accuracy, short probe lifespan, and difficulty in disassembling, replacing, and cleaning the probe. Utility Model Content

[0004] To address the shortcomings of existing technologies, the purpose of this utility model is to provide a pH adjustment and treatment system for arsenic-containing wastewater, which has the advantages of high adjustment accuracy, long probe lifespan, and easy probe disassembly, replacement, and cleaning.

[0005] To achieve the above objectives, the present invention provides the following technical solution:

[0006] A pH adjustment system for arsenic-containing wastewater includes an adjustment tank and a storage tank for storing lime slurry. An inlet pipe and an outlet pipe are connected to the top of one side and the other side of the adjustment tank, respectively. An inlet pipe, equipped with an automatic regulating valve, connects the storage tank to the top of the adjustment tank. An inverted L-shaped detection tube is installed inside the adjustment tank. The horizontal section of the detection tube, away from the vertical section, is connected to the inlet pipe. An outlet is located at the bottom of the vertical section of the detection tube, and one side of the vertical section is fitted against the inner wall of the other side of the adjustment tank. The adjustment tank is detachably connected. A front pH meter with a probe inserted into the vertical section of a detection tube is provided. A middle pH meter and a rear pH meter, both with probes located inside the equalization tank, are detachably connected sequentially at the front and rear of the top of the equalization tank. The middle pH meter is covered with a cleaning component and a bottom cover. A lifting mechanism that drives the cleaning component to move up and down is installed on the top of the equalization tank. The bottom cover has an opening at its upper end, and a first filter screen is connected to the opening. A second filter screen that fits tightly against the other four sides of the equalization tank is provided between the rear pH meter and the middle pH meter.

[0007] Further configuration: The cleaning assembly includes a cleaning ring, an annular sponge, a soft brush, and an inverted U-shaped bracket. The annular sponge and the soft brush are fixedly connected to the inner side of the cleaning ring from top to bottom. The two vertical sections of the bracket pass through the top of the regulating tank and are fixedly connected to the upper sides of the cleaning ring. A groove for placing the cleaning ring is provided on the inner side of the top of the regulating tank. The drive end of the lifting mechanism is fixedly connected to one side of the horizontal section of the bracket. A through hole for the front pH meter to pass through is provided in the middle of the horizontal section of the bracket.

[0008] Further configuration: The lifting mechanism includes a first lifting cylinder, a connecting plate, and a mounting base. The top rod of the first lifting cylinder is connected to one side of the horizontal section of the bracket through the connecting plate. The first lifting cylinder is detachably mounted on the top of the regulating pool through the mounting base.

[0009] Further configuration: The post-pH detector is also fitted with the cleaning component, and the top of the regulating tank is also equipped with the lifting mechanism that drives the cleaning component of the post-pH detector to move up and down.

[0010] Further configuration: The bottom cover includes a rotating cover, a fixed ring, and a set of connecting rods. The top of the rotating cover has a circular hole in the middle for the probes of the intermediate pH meter and the post pH meter to pass through. The top two sides of the rotating cover are rotatably connected to the bottom of the fixed ring. A U-shaped connecting part extends from one end of the set of connecting rods, and the other ends pass through the top of the regulating tank and are fixedly connected to the two sides of the fixed ring respectively. A cleaning sponge for cleaning the probe of the intermediate pH meter is connected inside the bottom of the rotating cover. A second lifting cylinder is detachably installed on the top of the regulating tank, and the top rod of the second lifting cylinder is detachably connected to the horizontal section of the connecting part.

[0011] Further configuration: The outer peripheral surfaces of the front pH meter, the intermediate pH meter, and the rear pH meter are all connected to external threaded blocks. The top and one side of the regulating tank are provided with threaded holes that are threadedly connected to the external threaded blocks. A first sealing ring is embedded between the outer wall of one side of the vertical section of the detection tube and the inner wall of one side of the regulating tank. A second sealing ring is provided between the external threaded block of the front pH meter and the outer wall of one side of the regulating tank.

[0012] Further configuration: A stirring mechanism is provided in the middle of the regulating tank. The stirring mechanism includes a stirring shaft and a motor that drives the stirring shaft to rotate. Several blades are evenly distributed from top to bottom on the stirring shaft. The second filter screen is located between the post-pH detector and the stirring mechanism. An L-shaped filter screen is detachably installed in the regulating tank between the post-pH detector and the second filter screen. The L-shaped filter screen, the first filter screen, and the second filter screen are all activated carbon filter screens. The water outlet pipe is located between the horizontal section of the L-shaped filter screen and the top of the regulating tank.

[0013] Further configuration: The bottom of the other side of the vertical section of the detection tube is provided with an inclined baffle that is inclined downward toward the side closer to the vertical section, and a channel for liquid to flow into the detection tube is formed between the bottom of the inclined baffle and the side of the vertical section of the detection tube; a water guiding part is provided in the bottom of the horizontal section of the detection tube, and the water guiding part is inclined downward toward the vertical section of the detection tube.

[0014] Further configuration: The top of the regulating tank is a cover plate, which is detachably connected to the upper end face of the regulating tank. The cover plate is detachably equipped with a set of nozzles for cleaning the probe of the intermediate pH meter, the probe of the post pH meter, and the stirring mechanism. A slag discharge port with an electric valve is provided on one side of the bottom of the regulating tank, and a slope is provided at the bottom of the regulating tank that is inclined downward toward the slag discharge port.

[0015] In summary, by installing a pre-pH meter, a mid-pH meter, and a post-pH meter, pH values ​​are measured at three points along the horizontal flow direction of wastewater within the equalization tank: near the inlet pipe, in the middle of the equalization tank, and near the outlet pipe. This improves the overall equalization accuracy. Furthermore, if one pH meter fails, the other two can continue measuring pH values, preventing the entire equalization system from being forced to shut down. The detection tube utilizes its horizontal section to slow the flow rate of wastewater entering from the inlet pipe, and its vertical section to prevent the rapidly flowing wastewater, stirred by the agitator, from impacting the probe of the pre-pH meter, thus protecting the meter and ensuring high overall equalization accuracy. The bottom cover and the... A first filter screen blocks the impact of rapidly flowing waste liquid on the probe of the intermediate pH meter while filtering the liquid to be tested entering the bottom cover, preventing contamination or scale buildup at the bottom of the intermediate pH meter probe, thus protecting the downstream pH meter and ensuring high overall adjustment accuracy. A second filter screen slows down and filters the rapidly flowing liquid near the outlet pipe, again protecting the downstream pH meter and ensuring high overall adjustment accuracy. When manual cleaning or replacement of the corresponding pH meter is required, simply remove the corresponding pH meter from one side or top of the adjustment tank. When automatic cleaning of the intermediate pH meter probe is required, activate the lifting mechanism. The drive end of the lifting mechanism drives the cleaning component to clean the upper section of the intermediate pH meter probe from top to bottom.

[0016] This invention employs a method that sequentially detects pH values ​​at three points along the horizontal flow direction of the waste liquid in the equalization tank. The pH meter is detachable and can be installed. It also automatically cleans and filters the pH meter, preventing the rapid flow of waste liquid from impacting and damaging the pH meter probe. At the same time, it avoids the easy contamination or adhesion of suspended solids and scale in the wastewater to the probe, thus preventing it from affecting the lifespan and accuracy of the pH meter probe. Overall, it has the advantages of high adjustment accuracy, long probe lifespan, and easy probe disassembly, replacement, and cleaning. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of Embodiment 1 of the present utility model;

[0018] Figure 2 This is a cross-sectional view of Embodiment 1 of the present utility model;

[0019] Figure 3 for Figure 2 A magnified view of part A;

[0020] Figure 4 for Figure 2 A magnified view of part B;

[0021] Figure 5 This is a partial structural schematic diagram of Embodiment 1 of the present utility model;

[0022] Figure 6 This is a cross-sectional view of Embodiment 2 of the present invention;

[0023] Figure 7 This is a cross-sectional view of Embodiment 3 of the present invention.

[0024] In the diagram: 1. Adjustment tank; 2. Medicine storage tank; 3. Inlet pipe; 4. Outlet pipe; 5. Medicine inlet pipe; 6. Automatic regulating valve; 7. Detection pipe; 8. Outlet; 9. Front pH meter; 10. Middle pH meter; 11. Rear pH meter; 12. Bottom cover; 13. Opening; 14. First filter screen; 15. Second filter screen; 16. Cleaning ring; 17. Annular sponge; 18. Soft brush; 19. Support; 20. Groove; 21. Through hole; 22. First lifting cylinder; 23. Connecting plate; 24. Mounting base; 25. Rotating cover; 26. Fixing ring; 27. Connecting rod; 28. Round hole; 29. ​​Cleaning sponge; 30. Second lifting cylinder; 31. External threaded block; 32. Threaded hole; 33. First sealing ring; 34. Second sealing ring; 35. Stirring shaft; 36. Blade; 37. Motor; 38. L-shaped filter screen; 39. Inclined baffle; 40. Channel; 41. Water guide; 42. Cover plate; 43. Nozzle; 44. Slag discharge port; 45. Slope. Detailed Implementation

[0025] To explain the technical content, objectives, and effects of this utility model in detail, the following description is provided in conjunction with the embodiments and accompanying drawings. It should be noted that the terms "upper" and "lower" used in the following description refer to the attached drawings. Figure 2 The direction in the middle, the words "bottom" and "top" refer to the attached Figure 2 The direction from the center of the central axis to the geometric center of a specific component, and the direction from "front" to "back" in the text, are the same as the horizontal direction AB from the inlet pipe to the outlet pipe of the regulating tank.

[0026] Please refer to Figures 1 to 7As shown, a pH adjustment system for arsenic-containing wastewater includes an adjustment tank 1 and a storage tank 2 for storing lime slurry. An inlet pipe 3 and an outlet pipe 4 are connected to the top of one side and the other side of the adjustment tank 1, respectively. An inlet pipe 5 connects the storage tank 2 to the top of the adjustment tank 1, and the inlet pipe 5 is equipped with an automatic regulating valve 6. A detection pipe 7 arranged in an inverted L-shape is installed inside the adjustment tank 1. The horizontal section of the detection pipe 7, away from the vertical section, is connected to the inlet pipe 3. An outlet 8 is located at the bottom of the vertical section of the detection pipe 7, and one side of the vertical section is fitted against the inner wall of the other side of the adjustment tank 1. A probe is detachably connected to the adjustment tank 1. A front pH meter 9 is installed in the vertical section of the detection tube 7. A middle pH meter 10 and a rear pH meter 11, with probes located inside the adjustment tank 1, are detachably connected to the top of the adjustment tank 1 in sequence. The middle pH meter 10 is covered with a cleaning component and a bottom cover 12. A lifting mechanism for driving the cleaning component to rise and fall is installed on the top of the adjustment tank 1. The bottom cover 12 has an opening 13 at the upper end, and the opening 13 is connected to a first filter screen 14. A second filter screen 15 is provided between the rear pH meter 11 and the middle pH meter 10, which is tightly fitted to the other four sides of the adjustment tank 1.

[0027] As described above, by setting up a front pH meter 9, a middle pH meter 10, and a rear pH meter 11, pH values ​​are measured at three locations arranged sequentially along the flow direction of wastewater in the equalization tank 1: near the inlet pipe 3, in the middle of the equalization tank 1, and near the outlet pipe 4. This improves the accuracy of pH adjustment. Furthermore, even if one of the pH meters fails, the entire equalization system can continue to operate, and the other two pH meters can still continue to measure pH values. The horizontal section of the detection tube 7 slows down the flow rate of the wastewater entering from the inlet pipe 3, while the vertical section of the detection tube 7 blocks the stirring action of the stirring mechanism. The rapidly flowing waste liquid impacts the probe of the front pH meter 9, affecting its detection accuracy and thus the overall adjustment accuracy. This serves to protect the front pH meter 9 and ensure high overall adjustment accuracy. The bottom cover 12 and the first filter screen 14 block the impact of the rapidly flowing waste liquid, stirred by the stirring mechanism, on the probe of the intermediate pH meter 10, thus protecting the rear pH meter 11 and ensuring high overall adjustment accuracy. After being slowed down and filtered by the first filter screen 14, the rapidly flowing liquid enters the bottom cover 12, facilitating the intermediate pH meter 10 probe to detect the pH value of the waste liquid in the middle of the adjustment tank 1.

[0028] The second filter 15 slows down and filters the fast-flowing liquid near the outlet pipe 4, preventing the rapidly flowing waste liquid from impacting and damaging the probe of the downstream pH meter 11. It also prevents blockage of the outlet pipe 4, protecting the downstream pH meter 11 and ensuring high overall adjustment accuracy. When manual cleaning or replacement of the upstream pH meter 9, intermediate pH meter 10, and downstream pH meter 11 is required, simply remove the corresponding pH meter from one side or the top of the adjustment tank 1 for replacement or cleaning. For automatic cleaning of the probe of the intermediate pH meter 10, the cleaning component and lifting mechanism are activated. The lifting mechanism's drive end drives the cleaning component to clean the probe of the intermediate pH meter 10 sequentially from top to bottom, thus achieving automatic cleaning of the probe. The above filtration and cleaning operations prevent suspended solids and scale in the wastewater from easily contaminating the probe and affecting the lifespan and accuracy of the upstream pH meter 9 probe, further improving overall adjustment accuracy and extending the lifespan of the detection probe.

[0029] Furthermore, the cleaning assembly includes a cleaning ring 16, an annular sponge 17, a soft brush 18, and a U-shaped bracket 19. The annular sponge 17 and the soft brush 18 are fixedly connected to the inner side of the cleaning ring 16 from top to bottom. The two vertical sections of the bracket 19 pass through the top of the regulating tank 1 and are fixedly connected to the upper sides of the cleaning ring 16. A groove 20 for placing the cleaning ring 16 is provided on the inner side of the top of the regulating tank 1. The drive end of the lifting mechanism is fixedly connected to one side of the horizontal section of the bracket 19. A through hole 21 for the front pH meter 9 to pass through is provided in the middle of the horizontal section of the bracket 19.

[0030] As can be seen from the above description, when it is necessary to automatically clean the probe of the intermediate pH meter 10, the lifting mechanism is activated. The drive end of the lifting mechanism drives the support 19 to move downward, which drives the cleaning ring 16, the soft brush 18 and the ring sponge 17 to clean the outer peripheral surface of the upper section of the probe of the intermediate pH meter 10 from top to bottom. This achieves the function of automatically cleaning the probe of the intermediate pH meter 10 except for the bottom upper section. The groove 20 is used to place the cleaning ring 16, the ring sponge 17 and the soft brush 18 when the cleaning components are not needed, reducing the volume occupied by the cleaning components in the conditioning tank 1.

[0031] Furthermore, the lifting mechanism includes a first lifting cylinder 22, a connecting plate 23, and a mounting base 24. The top rod of the first lifting cylinder 22 is connected to one side of the horizontal section of the bracket 19 through the connecting plate 23. The first lifting cylinder 22 is detachably mounted on the top of the regulating pool 1 through the mounting base 24.

[0032] As described above, when the probe of the intermediate pH meter 10 needs to be automatically cleaned, the first lifting cylinder 22 is activated. The top rod of the first lifting cylinder 22 extends, causing the bracket 19 to move downwards. This causes the cleaning ring 16, soft brush 18, and annular sponge 17 to clean the upper section of the probe of the intermediate pH meter 10 from top to bottom. When the cleaning ring 16 descends to the top of the bottom cover 12, the top rod of the first lifting cylinder 22 retracts, causing the bracket 19 to move upwards. This causes the cleaning ring 16, soft brush 18, and annular sponge 17 to clean the upper section of the probe of the intermediate pH meter 10 from bottom to top until the cleaning ring 16 rises to the groove 20. This achieves the function of automatically cleaning the upper section of the probe of the intermediate pH meter 10.

[0033] Furthermore, the post-pH meter 11 is also fitted with a cleaning component, and a lifting mechanism that drives the cleaning component of the post-pH meter 11 to move up and down is also installed on the top of the regulating tank 1.

[0034] As can be seen from the above description, when it is necessary to automatically clean the probe of the pH meter 11, the cleaning steps are the same as those for cleaning the probe of the intermediate pH meter 10. The lifting mechanism corresponding to the pH meter 11 is activated. The driving end of the lifting mechanism drives the cleaning component to clean the probe of the pH meter 11 from top to bottom and then from bottom to top, thereby achieving the function of automatically cleaning the probe of the pH meter 11.

[0035] Furthermore, the bottom cover 12 includes a rotating cover 25, a fixing ring 26, and a set of connecting rods 27. The top of the rotating cover 25 has a circular hole 28 in the middle for the probes of the intermediate pH meter 10 and the rear pH meter 11 to pass through. The top two sides of the rotating cover 25 are rotatably connected to the bottom of the fixing ring 26. One end of the set of connecting rods 27 is provided with a U-shaped connecting part, and the other end passes through the top of the regulating tank 1 and is fixedly connected to the two sides of the fixing ring 26 respectively. A cleaning sponge 29 for cleaning the probe of the intermediate pH meter 10 is connected inside the bottom of the rotating cover 25. A second lifting cylinder 30 is detachably installed on the top of the regulating tank 1. The top rod of the second lifting cylinder 30 is detachably connected to the horizontal section of the connecting rod 27.

[0036] As described above, under the stirring action of the stirring mechanism, the waste liquid rotates and flows rapidly, causing the rotating cover 25 to rotate at the bottom of the fixed ring 26, thereby buffering the impact of the waste liquid on the rotating cover 25 and extending the service life of the bottom cover 12. When it is necessary to clean the bottom of the probe of the intermediate pH meter 10, it is only necessary to activate the second lifting cylinder 30. The top rod of the second lifting cylinder 30 extends, causing the connecting part and the connecting rod part 27 to move upward, which in turn causes the fixed ring 26 and the rotating cover 25 to move upward by a preset value. At this time, the bottom of the rotating cover 25... The cleaning sponge 29 inside contacts the bottom of the probe of the intermediate pH meter 10. Then, under the stirring action of the stirring mechanism, the waste liquid drives the rotating cover 25 to rotate, which in turn drives the cleaning sponge 29 to rotate and clean the bottom of the probe of the intermediate pH meter 10. After cleaning for a certain period of time, the second lifting cylinder 30 is closed, the top rod of the second lifting cylinder 30 retracts, which drives the connecting part and the connecting rod part 27 to move downward, which in turn drives the fixed ring part 26 and the rotating cover part 25 to move downward and reset, thus achieving the function of automatically cleaning the bottom of the probe of the intermediate pH meter 10.

[0037] Furthermore, the outer peripheral surfaces of the front pH meter 9, the intermediate pH meter 10, and the rear pH meter 11 are all connected with external threaded blocks 31. The top of the regulating tank 1 and one side of the regulating tank 1 are provided with threaded holes 32 that are threadedly connected to the external threaded blocks 31. A first sealing ring 33 is embedded between the outer wall of one side of the vertical section of the detection tube 7 and the inner wall of one side of the regulating tank 1. A second sealing ring 34 is provided between the external threaded block 31 of the front pH meter 9 and the outer wall of one side of the regulating tank 1.

[0038] As can be seen from the above description, when it is necessary to disassemble, replace or clean the corresponding pH meter, simply unscrew the external threaded block 31 of the corresponding pH meter from the threaded hole 32 on the top or side of the corresponding regulating tank 1. This allows the front pH meter 9, the middle pH meter 10 and the rear pH meter 11 to be disassembled, replaced and cleaned. The first sealing ring 33 and the second sealing ring 34 prevent waste liquid from flowing from the vertical section of the detection tube 7 to the space between the outer wall of the vertical section of the detection tube 7 and the inner wall of the regulating tank 1, or to the outside of the regulating tank 1, thus ensuring the airtightness between the probe of the front pH meter 9 and the regulating tank 1.

[0039] Furthermore, a stirring mechanism is provided in the middle of the regulating tank 1. The stirring mechanism includes a stirring shaft 35 and a motor 37 that drives the stirring shaft 35 to rotate. Several blades 36 are evenly distributed from top to bottom on the stirring shaft 35. The second filter screen 15 is located between the rear pH meter 11 and the stirring mechanism. An L-shaped filter screen 38 is detachably installed in the regulating tank 1 between the rear pH meter 11 and the second filter screen 15. The L-shaped filter screen 38, the first filter screen 14, and the second filter screen 15 are all activated carbon filters. The water outlet pipe 4 is located between the horizontal section of the L-shaped filter screen 38 and the top of the regulating tank 1.

[0040] As described above, when lime slurry needs to enter the regulating tank 1 through the feed tank, the motor 37 is started. The motor 37 drives the stirring shaft 35 to rotate, thereby driving the blades 36 to mix the waste liquid and lime slurry in the regulating tank 1 evenly. The mixture passes through the L-shaped filter screen 38, which is used to slow down and filter the fast-flowing liquid that is close to the outlet pipe 4. This further prevents the fast-flowing waste liquid from impacting and damaging the probe of the pH meter 11. At the same time, it prevents the outlet pipe 4 from becoming blocked, thus protecting the pH meter 11, ensuring high overall regulation accuracy, and ensuring smooth discharge from the outlet pipe 4.

[0041] Furthermore, the bottom of the other side of the vertical section of the detection tube 7 is provided with an inclined baffle 39 that is inclined downward toward the side of the vertical section. A channel 40 for liquid to flow into the detection tube 7 is formed between the bottom of the inclined baffle 39 and the side of the vertical section of the detection tube 7. A water guiding part 41 is provided in the bottom of the horizontal section of the detection tube 7. The water guiding part 41 is inclined downward toward the vertical section of the detection tube 7.

[0042] As described above, the inclined baffle 39 is used to block the impact of the rapidly flowing liquid under the stirring action of the stirring mechanism on the probe of the front pH meter 9, and at the same time slows down the waste liquid, thus protecting the front pH meter 9 and ensuring the overall adjustment accuracy. The water guide section 41 is used to ensure that all the waste liquid in the horizontal section of the detection tube 7 from the water inlet pipe 3 flows quickly into the vertical section of the detection tube 7. After being slowed down, the waste liquid enters the vertical section of the detection tube 7 through the channel 40, which facilitates the probe of the front pH meter 9 to automatically detect the pH value of the waste liquid in the adjustment tank 1 near the water inlet pipe 3.

[0043] Furthermore, the top of the equalization tank 1 is a cover plate 42, which is detachably connected to the upper end face of the equalization tank 1. A set of nozzles 43 for cleaning the probe of the intermediate pH meter 10, the probe of the post pH meter 11, and the stirring mechanism are detachably installed on the cover plate 42. A slag discharge port 44 with an electric valve is provided on one side of the bottom of the equalization tank 1, and a slope 45 is provided at the bottom of the equalization tank 1 that is inclined downward toward the slag discharge port 44.

[0044] As can be seen from the above description, when it is necessary to clean the probe of the intermediate pH meter 10, the probe of the post pH meter 11, and the stirring mechanism, it is only necessary to connect the nozzle 43 with an external water source and use an external water pump to draw water into the nozzle 43. The nozzle 43 cleans the probe of the intermediate pH meter 10, the probe of the post pH meter 11, and the stirring mechanism. After cleaning, the water falls through the slope 45 to the slag discharge port 44. The electric valve is opened, and the wastewater after cleaning is discharged from the slag discharge port 44 to the outside of the equalization tank 1. Since the top of the equalization tank 1 is a removable cover plate 42, when it is necessary to clean the inside of the tank or replace the structure on the cover plate 42, it is only necessary to remove the cover plate 42.

[0045] Reference Figures 1 to 5 The first embodiment provided by this utility model is as follows:

[0046] A pH adjustment treatment system for arsenic-containing wastewater includes an adjustment tank 1 and a storage tank 2 for storing lime slurry. An inlet pipe 3 is connected to the top of one side of the adjustment tank 1, and an outlet pipe 4 is connected to the other side. A chemical inlet pipe 5 connects the storage tank 2 to the top of the adjustment tank 1. The chemical inlet pipe 5 is equipped with an automatic regulating valve 6. A stirring mechanism is located in the middle of the adjustment tank 1. The stirring mechanism includes a stirring shaft 35 and a motor 37 that drives the stirring shaft 35 to rotate. The stirring shaft 35 has several blades 36 evenly distributed from top to bottom. To control the liquid level in the adjustment tank 1, a liquid level sensor (not shown in the figure) can be installed inside the adjustment tank 1. The top of the adjustment tank 1 is a cover plate 42, which is detachably connected to the upper surface of the adjustment tank 1.

[0047] The regulating tank 1 is equipped with an inverted L-shaped detection tube 7. The horizontal section of the detection tube 7 is connected to the inlet pipe 3 on the side away from the vertical section. The bottom of the vertical section of the detection tube 7 is provided with an outlet 8, and one side of the vertical section is attached to the inner wall of the other side of the regulating tank 1. The regulating tank 1 is detachably connected to a front pH meter 9 with a probe inserted into the vertical section of the detection tube 7. The bottom of the other side of the vertical section of the detection tube 7 is provided with an inclined baffle 39 that is inclined downward toward the side closer to its vertical section. A channel 40 for liquid to flow into the detection tube 7 is formed between the bottom of the inclined baffle 39 and one side of the vertical section of the detection tube 7. A water guide part 41 is provided in the bottom of the horizontal section of the detection tube 7. The water guide part 41 is inclined downward toward the vertical section of the detection tube 7.

[0048] The top of the equalization tank 1 is detachably connected to an intermediate pH meter 10 and a rear pH meter 11, both with probes located inside the equalization tank 1. The intermediate pH meter 10 is covered with a cleaning component and a bottom cover 12. A lifting mechanism for driving the cleaning component to rise and fall is installed on the top of the equalization tank 1. The bottom cover 12 has an opening 13 at its upper end, and the opening 13 is connected to a first filter screen 14. A second filter screen 15 is provided between the rear pH meter 11 and the intermediate pH meter 10, which is in close contact with the other four sides of the equalization tank 1. The second filter screen 15 is located between the rear pH meter 11 and the stirring mechanism. An L-shaped filter screen 38 is detachably installed inside the equalization tank 1, located between the rear pH meter 11 and the second filter screen 15. The L-shaped filter screen 38, the first filter screen 14, and the second filter screen 15 are all activated carbon filters. The water outlet pipe 4 is located between the horizontal section of the L-shaped filter screen 38 and the top of the equalization tank 1.

[0049] The cleaning assembly includes a cleaning ring 16, an annular sponge 17, a soft brush 18, and a U-shaped bracket 19. The annular sponge 17 and the soft brush 18 are fixedly connected to the inner side of the cleaning ring 16 from top to bottom. The two vertical sections of the bracket 19 pass through the top of the regulating tank 1 and are fixedly connected to the upper sides of the cleaning ring 16. A groove 20 for placing the cleaning ring 16 is provided on the inner side of the top of the regulating tank 1. The drive end of the lifting mechanism is fixedly connected to one side of the horizontal section of the bracket 19. A through hole 21 for the front pH meter 9 to pass through is provided in the middle of the horizontal section of the bracket 19.

[0050] The lifting mechanism includes a first lifting cylinder 22, a connecting plate 23, and a mounting base 24. The top rod of the first lifting cylinder 22 is connected to one side of the horizontal section of the bracket 19 through the connecting plate 23. The first lifting cylinder 22 is detachably mounted on the top of the regulating pool 1 through the mounting base 24.

[0051] The bottom cover 12 includes a rotating cover 25, a fixing ring 26, and a set of connecting rods 27. The top of the rotating cover 25 has a circular hole 28 in the center for the probes of the intermediate pH meter 10 and the rear pH meter 11 to pass through. The top two sides of the rotating cover 25 are rotatably connected to the bottom of the fixing ring 26. A U-shaped connecting portion extends from one end of each of the connecting rods 27, and the other ends pass through the top of the regulating tank 1 and are fixedly connected to both sides of the fixing ring 26. A cleaning sponge 29 for cleaning the probe of the intermediate pH meter 10 is connected inside the bottom of the rotating cover 25. A second lifting cylinder 30 is detachably installed on the outside of the top of the regulating tank 1, and the top rod of the second lifting cylinder 30 is detachably connected to the horizontal section of the connecting rods 27. Additionally, water inside the bottom cover 12 will splash out during rotation. To facilitate the bottom cover 12... To better drain the water inside, several drainage holes (not shown in the figure) can be opened at the bottom of the bottom cover 12. After the second lifting cylinder 30 drives the bottom cover 12 to rise, the probe is used to squeeze the cleaning sponge 29 to discharge the residual liquid through the drainage holes.

[0052] The outer circumferential surfaces of the front pH meter 9, the intermediate pH meter 10, and the rear pH meter 11 are all connected with external threaded blocks 31. The top of the regulating tank 1 and one side of the regulating tank 1 are provided with threaded holes 32 that are threadedly connected to the external threaded blocks 31. A first sealing ring 33 is embedded between the outer wall of one side of the vertical section of the detection tube 7 and the inner wall of one side of the regulating tank 1. A second sealing ring 34 is provided between the external threaded block 31 of the front pH meter 9 and the outer wall of one side of the regulating tank 1.

[0053] Example 2 differs from Example 1 in that, as Figure 6 As shown, the post-pH detector 11 is also covered with a cleaning component, and a lifting mechanism that drives the cleaning component of the post-pH detector 11 to move up and down is also installed on the top of the regulating tank 1.

[0054] Example 3 differs from Example 1 in that, as Figure 7 As shown, a set of nozzles 43 for cleaning the probe of the intermediate pH meter 10, the probe of the post pH meter 11 and the stirring mechanism are detachably installed on the cover plate 42. A slag discharge port 44 with an electric valve is provided on one side of the bottom of the regulating tank 1. A slope 45 is provided at the bottom of the regulating tank 1, which is inclined downward toward the slag discharge port 44.

[0055] In summary, compared with the prior art, this utility model has the advantages of high adjustment accuracy, long probe service life, and easy probe disassembly, replacement, and cleaning. The working process is as follows: Arsenic-containing wastewater enters the regulating tank 1 through the inlet pipe 3. The wastewater flows from one side of the horizontal section of the detection pipe 7 through the inlet pipe 3 to the other side for buffering and deceleration, and then enters the vertical section of the detection pipe 7. The pH value of the wastewater in the vertical section of the detection pipe 7 is automatically detected by the front pH detector 9. After the wastewater level in the regulating tank 1 reaches the preset value, the detection result of the front pH detector 9 is sent to the external controller. The external controller controls the automatic regulating valve 6 to open, and the lime slurry in the storage tank 2 enters the regulating tank 1 through the inlet pipe 5 until the front pH detector 9, the intermediate pH detector 10, and the rear pH detector 11 detect the pH value. When the pH of the wastewater in the equalization tank 1 is adjusted to the preset value of about 6-8, the outlet pipe 4 is opened. The adjusted wastewater is then discharged from the outlet pipe 4 after being filtered by the second filter screen 15 and the L-shaped filter screen 38. This utility model adopts a method of sequentially detecting the pH value at three points along the horizontal flow direction of the waste liquid in the equalization tank 1. All three pH detectors are detachable and installable. The pH detectors are automatically cleaned and filtered using the detection tube 7, bottom cover 12, first filter screen 14, second filter screen 15, cleaning components, lifting mechanism, and L-shaped filter screen 38. This avoids the impact damage to the probe of the pH detector caused by the rapidly flowing waste liquid. At the same time, it prevents suspended solids and scale in the wastewater from easily contaminating or adhering to the probe, thereby affecting the service life and detection accuracy of the probe of the front pH detector 9.

[0056] The above description is merely a preferred embodiment of this utility model. The protection scope of this utility model is not limited to the above embodiments. All technical solutions falling within the scope of this utility model's concept are protected. It should be noted that for those skilled in the art, any improvements and modifications made without departing from the principle of this utility model should also be considered within the protection scope of this utility model.

Claims

1. A pH adjustment and treatment system for arsenic-containing wastewater, characterized in that: The system includes an equalization tank and a storage tank for storing lime slurry. The equalization tank has an inlet pipe connected to the top of one side and an outlet pipe to the other. An inlet pipe, equipped with an automatic regulating valve, connects the storage tank to the top of the equalization tank. An inverted L-shaped detection tube is installed inside the equalization tank. The horizontal section of the detection tube, away from the vertical section, connects to the inlet pipe. An outlet is located at the bottom of the vertical section of the detection tube, and one side of the vertical section is flush with the inner wall of the other side of the equalization tank. A front pH meter with a probe inserted into the vertical section of the detection tube is detachably connected to the equalization tank. A middle pH meter and a rear pH meter, both with probes located inside the equalization tank, are detachably connected sequentially to the top of the equalization tank. The middle pH meter is covered by a cleaning component and a bottom cover. A lifting mechanism for driving the cleaning component is installed outside the top of the equalization tank. An opening is located at the top of the bottom cover, connected to a first filter screen. A second filter screen, flush with the other four sides of the equalization tank, is located between the rear and middle pH meters.

2. The pH adjustment and treatment system for arsenic-containing wastewater according to claim 1, characterized in that: The cleaning assembly includes a cleaning ring, a ring-shaped sponge, a soft brush, and an inverted U-shaped support. The ring-shaped sponge and the soft brush are fixedly connected to the inner side of the cleaning ring from top to bottom. The two vertical sections of the support pass through the top of the regulating tank and are fixedly connected to the upper sides of the cleaning ring. A groove for placing the cleaning ring is provided on the inner side of the top of the regulating tank. The drive end of the lifting mechanism is fixedly connected to one side of the horizontal section of the support. A through hole for the front pH meter to pass through is provided in the middle of the horizontal section of the support.

3. The pH adjustment and treatment system for arsenic-containing wastewater according to claim 2, characterized in that: The lifting mechanism includes a first lifting cylinder, a connecting plate, and a mounting base. The top rod of the first lifting cylinder is connected to one side of the horizontal section of the bracket through the connecting plate. The first lifting cylinder is detachably mounted on the top of the regulating pool through the mounting base.

4. The pH adjustment and treatment system for arsenic-containing wastewater according to claim 3, characterized in that: The post-pH detector is also fitted with the cleaning component, and the top of the regulating tank is also equipped with the lifting mechanism that drives the cleaning component of the post-pH detector to move up and down.

5. The pH adjustment and treatment system for arsenic-containing wastewater according to claim 1, characterized in that: The bottom cover includes a rotating cover, a fixed ring, and a set of connecting rods. The top of the rotating cover has a circular hole in the middle for the probes of the intermediate pH meter and the post pH meter to pass through. The top two sides of the rotating cover are rotatably connected to the bottom of the fixed ring. A U-shaped connecting part extends from one end of the set of connecting rods, and the other ends of each rod pass through the top of the regulating tank and are fixedly connected to the two sides of the fixed ring. A cleaning sponge for cleaning the probe of the intermediate pH meter is connected inside the bottom of the rotating cover. A second lifting cylinder is detachably installed on the top of the regulating tank, and the top rod of the second lifting cylinder is detachably connected to the horizontal section of the connecting part.

6. The pH adjustment and treatment system for arsenic-containing wastewater according to claim 1, characterized in that: The outer circumferential surfaces of the front pH meter, the intermediate pH meter, and the rear pH meter are all connected to external threaded blocks. The top and one side of the regulating tank are provided with threaded holes that are threadedly connected to the external threaded blocks. A first sealing ring is embedded between the outer wall of one side of the vertical section of the detection tube and the inner wall of one side of the regulating tank. A second sealing ring is provided between the external threaded block of the front pH meter and the outer wall of one side of the regulating tank.

7. The pH adjustment and treatment system for arsenic-containing wastewater according to claim 1, characterized in that: A stirring mechanism is provided in the middle of the regulating tank. The stirring mechanism includes a stirring shaft and a motor that drives the stirring shaft to rotate. Several blades are evenly distributed from top to bottom on the stirring shaft. The second filter screen is located between the post-pH detector and the stirring mechanism. An L-shaped filter screen is detachably installed in the regulating tank between the post-pH detector and the second filter screen. The L-shaped filter screen, the first filter screen, and the second filter screen are all activated carbon filter screens. The water outlet pipe is located between the horizontal section of the L-shaped filter screen and the top of the regulating tank.

8. The pH adjustment and treatment system for arsenic-containing wastewater according to claim 7, characterized in that: The bottom of the other side of the vertical section of the detection tube is provided with an inclined baffle that is inclined downward toward the side closer to the vertical section. A channel for liquid to flow into the detection tube is formed between the bottom of the inclined baffle and the side of the vertical section of the detection tube. A water guiding part is provided in the bottom of the horizontal section of the detection tube. The water guiding part is inclined downward toward the vertical section of the detection tube.

9. The pH adjustment and treatment system for arsenic-containing wastewater according to claim 7, characterized in that: The top of the regulating tank is a cover plate, which is detachably connected to the upper end face of the regulating tank. The cover plate is detachably equipped with a probe for cleaning the intermediate pH meter, the probe of the post pH meter, and a set of nozzles for the stirring mechanism. A slag discharge port with an electric valve is provided on one side of the bottom of the regulating tank, and a slope is provided at the bottom of the regulating tank that is inclined downward toward the slag discharge port.

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