Arsenic-containing wastewater treatment device

Abstract

The present invention relates to the technical field related to water pollution control, and specifically discloses an arsenic-containing wastewater treatment device, comprising a bracket and a tank body fixedly mounted within the bracket, wherein a partition is fixedly mounted within the tank body; a liquid supply assembly for intermittently introducing an oxidant into the wastewater below the partition; a sampling assembly for intermittently sampling the wastewater; and a monitoring assembly for monitoring the status of the wastewater sample. The present invention allows for better control of the reaction rate of hydrogen peroxide with arsenic by introducing small amounts of hydrogen peroxide into the arsenic-containing wastewater multiple times, avoiding incomplete treatment due to an overly rapid reaction and overoxidation or other side reactions that may result from the addition of a large amount of hydrogen peroxide at one time, thereby ensuring the selectivity of the oxidation process. The device also prevents excess hydrogen peroxide from reacting with other substances in the wastewater, altering the pH value of the wastewater, and reducing the efficiency of subsequent pentavalent arsenic precipitation reactions or causing unstable precipitation.

Description

Technical Field

[0001] The present invention relates to the technical field related to water pollution control, and in particular to an arsenic-containing wastewater treatment device. Background Art

[0002] Arsenic is a toxic element that poses serious risks to humans and other organisms. Long-term exposure to arsenic-containing environments or drinking water with excessive arsenic levels can lead to symptoms of chronic arsenic poisoning, including skin pigmentation abnormalities, keratinization, skin cancer, and visceral cancer. Arsenic-containing wastewater primarily originates from industrial activities, such as wastewater discharged from factories producing sulfuric acid, phosphate fertilizers, smelting, and pesticides. Therefore, arsenic-containing wastewater requires rigorous treatment to reduce its arsenic content before discharge.

[0003] Most existing methods for treating arsenic-containing wastewater involve oxidizing trivalent arsenic in the wastewater into pentavalent arsenic using oxidants, and then removing it through coagulation and sedimentation. However, this method has relatively strict requirements on the pH value of the wastewater, and existing arsenic-containing wastewater treatment equipment cannot monitor in real time whether the trivalent arsenic in the wastewater is completely oxidized into pentavalent arsenic. This can easily cause excess oxidants in the wastewater to react with other substances, which may change the form of these substances and thus affect the pH value of the solution. Summary of the Invention

[0004] The object of the present invention is to provide an arsenic-containing wastewater treatment device to solve at least one technical problem existing in the above-mentioned prior art.

[0005] To achieve the above object, the present invention provides the following technical solution: an arsenic-containing wastewater treatment device, comprising a bracket and a tank body fixedly installed in the bracket, wherein a partition is fixedly installed in the tank body;

[0006] It also includes a liquid supply component, which is used to intermittently introduce an oxidant into the wastewater below the partition;

[0007] Also included is a sampling assembly for intermittently sampling the wastewater;

[0008] Also included is a monitoring component for monitoring the status of the wastewater sample.

[0009] The top of described sliding panel also is provided with an interlocking structure, and the interlocking structure of described sliding panel also is provided with an interlocking structure, and the interlocking structure of described sliding panel is that cam be connected with the interlocking structure of described sliding panel and the interlocking structure of described sliding panel.

[0010] Also included is an injection assembly for injecting the wastewater sample in the holder into the test tube.

[0011] Preferably, the injection assembly includes a sliding curved rod slidably mounted in a holder, a tension spring fixedly mounted between the holder and the inner wall of the tank and sleeved on the outer wall of the sliding curved rod, a piston slidably mounted on the inner wall of the holder, an L-shaped curved rod penetrating the holder and having one end fixedly connected to the sliding curved rod fixedly mounted on the outer wall of the piston, and a needle that can be inserted into the test tube from the side is fixedly connected to one end of the L-shaped curved rod;

[0012] It also includes a driving component, which is used to drive the L-shaped curved rod to perform reciprocating motion.

[0013] Preferably, the driving assembly includes a driving gear fixedly mounted on the outer wall of the driving shaft, and also includes a driven gear rotatably mounted on the top of the partition and meshing with the driving gear, a cam and a rotating handle are coaxially mounted on the top of the driven gear, the circular surface of the cam can be against the circular ring at the end of the L-shaped bent rod, a limit block is rotatably mounted on the top end face of the rotating handle, a regular polygonal through groove is provided in the center of the rotating disk, and a transverse groove is also provided at the end point of each regular polygon, and a plurality of test tubes are respectively mounted in the corresponding transverse grooves, and when the limit block rotates with the rotating handle, it can be rotated into the transverse groove and drive the rotating disk to rotate.

[0014] Preferably, the monitoring component includes an air bag fixed on the top of the test tube, a trigger device is provided above the air bag, and the trigger device is electrically connected to the liquid supply component.

[0015] Preferably, the test tube is made of a transparent material, and a monitor fixedly mounted on the top of the partition is provided below the test tube, and the monitor is electrically connected to the liquid supply component.

[0016] Preferably, a long stirring rod and a short stirring rod are fixedly installed on both sides of the rotating rod, and multiple sets of stirring fans are fixedly installed on the outer walls of the long stirring rod and the short stirring rod. The long stirring rod is connected to the inside of the tank body and the rotating box respectively through a water inlet pipe, and a filter is provided at the water inlet at the top of the long stirring rod.

[0017] Preferably, the liquid supply assembly includes a rotating ring rotatably mounted on the outer wall of the driving shaft, an annular groove is provided in the rotating ring, the annular groove of the rotating ring is connected to the external liquid supply equipment, the annular groove is connected to the rotating box through a liquid inlet pipe buried in the driving shaft, the stirring short rod is connected to the interior of the tank body through a liquid outlet pipe buried in the rotating rod and the stirring short rod, and a one-way liquid outlet valve is provided at the liquid outlet on the top surface of the stirring short rod.

[0018] Preferably, the water inlet on the top surface of the long stirring rod is arranged below the liquid level of the wastewater, and the liquid outlet on the top surface of the short stirring rod is arranged in the middle or bottom of the wastewater.

[0019] Preferably, pulleys capable of sliding in annular grooves provided on the inner wall of the tank body are rotatably mounted on both ends of the rotating rod.

[0020] Compared with the prior art, the present invention has the following beneficial effects:

[0021] 1. The present invention can better control the reaction rate of hydrogen peroxide and arsenic by introducing hydrogen peroxide into arsenic-containing wastewater in small amounts and multiple times, avoid incomplete treatment due to excessive reaction, and avoid excessive oxidation or other side reactions that may be caused by adding a large amount of hydrogen peroxide at one time, ensure the selectivity of the oxidation process, reduce waste, and reduce operational risks. Subsequently, the wastewater is sampled after each introduction of hydrogen peroxide through a sampling component, and the wastewater is monitored in real time in conjunction with a monitoring component to ensure that the introduction of hydrogen peroxide can be stopped in time after the trivalent arsenic in the wastewater is completely oxidized to pentavalent arsenic, thereby achieving the purpose of reducing waste and corrosion of treatment equipment and pipelines. At the same time, it is avoided that excessive hydrogen peroxide reacts with other substances in the wastewater, changes the pH value in the wastewater, and reduces the efficiency of the subsequent pentavalent arsenic precipitation reaction or makes the precipitation unstable.

[0022] Second, the present invention uses an eccentric rotation of the driving shaft inside the tank body to enable the rotating rod to stir the wastewater in the tank body, accelerate the oxidation of trivalent arsenic by hydrogen peroxide in the wastewater, and make the sample obtained by the sampling component more uniform, thereby avoiding distortion of the monitoring results due to the unevenness of the wastewater sample, thereby causing misjudgment of the reaction condition of the wastewater. The wastewater sample is injected into the test tube through the injection component for reaction detection, thereby achieving the purpose of real-time monitoring of the trivalent arsenic content of the wastewater, avoiding the introduction of excessive hydrogen peroxide causing the pH value in the wastewater to change, which affects the subsequent process of precipitating pentavalent arsenic. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the three-dimensional structure of the present invention;

[0024] Figure 2 Schematic diagram of the three-dimensional cross-sectional structure of the first embodiment of the present invention;

[0025] Figure 3 It is a cross-sectional schematic diagram of the present invention;

[0026] Figure 4 It is a cross-sectional view of the liquid injection component of the present invention;

[0027] Figure 5 This is a schematic diagram of the three-dimensional structure of the components inside the tank of the present invention;

[0028] Figure 6 This is a sectional view of the three-dimensional structure of the internal components of the tank body of the present invention;

[0029] Figure 7 This is a schematic diagram of the three-dimensional structure of the drive assembly of the present invention;

[0030] Figure 8 It is a schematic diagram of the three-dimensional cross-sectional structure of the second embodiment of the present invention.

[0031] In the figure: 1. bracket; 2. tank body; 3. mounting plate; 4. partition; 5. motor; 6. driving shaft; 7. driving gear; 8. driven gear; 9. cam; 10. rotating handle; 11. limit block; 12. tension spring; 13. sliding bent rod; 14. L-shaped bent rod; 15. holder; 16. rotating disk; 17. rotating box; 18. rotating rod; 19. pulley; 20. piston plate; 21. long stirring rod; 22. short stirring rod; 23. rotating ring; 24. test tube; 25. air bag; 26. filter screen; 27. monitor; 28. piston; 29. ​​liquid inlet pipe; 30. water inlet pipe; 31. liquid outlet pipe; 32. water supply pipe. DETAILED DESCRIPTION

[0032] The following will provide a clear and complete description of the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0033] See also Figures 1 to 8 , the present invention provides a technical solution: an arsenic-containing wastewater treatment device, comprising a bracket 1 and a tank body 2 fixedly installed in the bracket 1, a partition 4 fixedly installed in the tank body 2;

[0034] It also includes a liquid supply component, which is used to intermittently introduce an oxidant into the wastewater below the partition 4;

[0035] Also included is a sampling assembly, the sampling assembly being used for intermittently sampling the wastewater;

[0036] Also included is a monitoring component for monitoring the status of the wastewater sample.

[0037] When the device is in use, a small amount of oxidant (hydrogen peroxide is generally used as the oxidant) is first introduced into the wastewater below the partition 4 through the liquid supply component, and then the hydrogen peroxide is allowed to react with the trivalent arsenic in the wastewater to oxidize the trivalent arsenic into pentavalent arsenic, which helps to improve the removal efficiency of arsenic and reduce its toxicity. After standing for a period of time, the sampling component is driven to intermittently sample the wastewater, and the status of the sample is monitored by the monitoring component. Subsequently, a small amount of hydrogen peroxide is intermittently introduced into the wastewater during the intervals between the sampling of the wastewater by the sampling component until the monitoring component detects changes in the sample, thereby proving that the trivalent arsenic in the wastewater has been completely oxidized into pentavalent arsenic. At this time, the liquid supply component stops supplying liquid, the sampling component also stops sampling, and the next step of removing pentavalent arsenic from the wastewater begins.

[0038] In this way, by introducing hydrogen peroxide into the arsenic-containing wastewater in small amounts and multiple times, the reaction rate of hydrogen peroxide and arsenic can be better controlled, avoiding incomplete treatment due to excessive reaction and excessive oxidation or other side reactions that may be caused by adding a large amount of hydrogen peroxide at one time, ensuring the selectivity of the oxidation process, reducing waste and reducing operational risks. Subsequently, the wastewater is sampled after each introduction of hydrogen peroxide through the sampling component, and the wastewater is monitored in real time in conjunction with the monitoring component to ensure that the introduction of hydrogen peroxide can be stopped in time after the trivalent arsenic in the wastewater is completely oxidized to pentavalent arsenic, so as to achieve the purpose of reducing waste and corrosion of treatment equipment and pipelines, and at the same time avoid excessive hydrogen peroxide from reacting with other substances in the wastewater, changing the pH value in the wastewater, and reducing the efficiency of the subsequent pentavalent arsenic precipitation reaction or making the precipitation unstable.

[0039] Furthermore, the sampling assembly includes a mounting plate 3 fixedly mounted on the bottom of the tank body 2, a motor 5 is fixedly mounted on the bottom surface of the mounting plate 3, a driving shaft of the motor 5 that penetrates into the tank body 2 is fixedly connected to a driving shaft 6, and the driving shaft 6 is eccentrically arranged with the tank body 2, a portion of the driving shaft 6 that passes through the partition 4 is sealed and rotatably connected with a holder 15 fixedly mounted on the inner wall of the tank body 2, a rotating box 17 is fixedly mounted in the middle of the driving shaft 6, a piston plate 20 is slidably mounted in the rotating box 17, an annular groove is provided on the inner wall of the tank body 2, and the piston The outer wall of the plate 20 is fixedly installed with a rotating rod 18 that penetrates the rotating box 17 and has both ends respectively embedded in the annular groove and can contact and abut against the inner wall of the tank body 2. The rotating box 17 and the holder 15 are connected in one direction through the upper water pipe 32. The space on one side of the piston plate 20 is connected in one direction with the interior of the tank body 2 through the water inlet pipe 30 buried in the rotating rod 18. The inner wall of the tank body 2 is rotatably installed with a rotating disk 16. A plurality of test tubes 24 distributed in an annular shape are fixedly installed in the rotating disk 16. The test tubes 24 are T-shaped and contain detection reagents.

[0040] The device further includes an injection assembly for injecting the wastewater sample in the holder 15 into the test tube 24 .

[0041] According to the above embodiment, a specific embodiment of the sampling assembly is provided. When the rotating shaft of the motor 5 drives the driving shaft 6 to rotate together, it will drive the rotating box 17 to rotate together. The rotating rod 18 in the rotating box 17 slides in the annular groove provided on the inner wall of the tank body 2. Since the driving shaft 6 is eccentrically arranged, the rotating rod 18 will drive the piston plate 20 to slide in the rotating box 17 when it rotates. Figure 2 At this time, the piston plate 20 moves away from the water inlet pipe 30, so that the space on the right side of the piston plate 20 becomes larger and the internal air pressure decreases, thereby sucking the wastewater in the tank body 2 from the water inlet pipe 30 into the rotating box 17. As the rotating box 17 continues to rotate, the piston plate 20 moves in the opposite direction. Since the water inlet pipe 30 is in one-way communication with the interior of the tank body 2, the piston plate 20 can squeeze the wastewater sample into the holder 15 through the upper water pipe 32 when it moves. Then, the wastewater sample in the holder 15 is injected into the test tube 24 through the injection assembly. The detection reagent (preferably potassium permanganate solution) in the test tube 24 can detect whether the wastewater contains hydrogen peroxide. If the wastewater does not contain hydrogen peroxide, that is, the potassium permanganate solution does not react with the hydrogen peroxide to produce oxygen, it means that the trivalent arsenic in the wastewater has not been completely oxidized to pentavalent arsenic. The hydrogen peroxide introduced into the wastewater preferentially reacts with the trivalent arsenic in the wastewater before coming into contact with the potassium permanganate solution and has been consumed. If a large number of bubbles appear in the test tube, it means that the trivalent arsenic in the wastewater has been completely oxidized to pentavalent arsenic, and the remaining hydrogen peroxide has entered the test tube 24 and reacted with the potassium permanganate solution. At this time, the liquid supply component should be stopped immediately from introducing hydrogen peroxide into the wastewater.

[0042] In this way, the driving shaft 6 is eccentrically rotated inside the tank body 2, so that the rotating rod 18 can stir the wastewater in the tank body 2, accelerate the oxidation of trivalent arsenic by hydrogen peroxide in the wastewater, and make the sample obtained by the sampling assembly more uniform, thereby avoiding distortion of the monitoring result due to the unevenness of the wastewater sample, thereby causing misjudgment of the reaction condition of the wastewater. At the same time, the eccentric rotation is used to drive the piston plate 20 to slide back and forth in the rotating box 17, and the air pressure change in the rotating box 17 is used to sample the wastewater in the tank body 2 and transport the sample to the holder 15. The wastewater sample is injected into the test tube 24 through the injection assembly, so that the wastewater sample is combined with the detection reagent, thereby determining whether the trivalent arsenic in the wastewater is completely oxidized to pentavalent arsenic, thereby achieving the purpose of real-time monitoring of the trivalent arsenic content in the wastewater, and avoiding the introduction of excessive hydrogen peroxide that causes the pH value of the wastewater to change, thereby affecting the subsequent process of precipitating the pentavalent arsenic.

[0043] Furthermore, the injection assembly includes a sliding curved rod 13 slidably mounted in a holder 15, a tension spring 12 fixedly mounted between the holder 15 and the inner wall of the tank body 2 and sleeved on the outer wall of the sliding curved rod 13, a piston 28 slidably mounted on the inner wall of the holder 15, an L-shaped curved rod 14 fixedly mounted on the outer wall of the piston 28, which passes through the holder 15 and is fixedly connected to the sliding curved rod 13 at one end, and a needle that can be inserted into the test tube 24 from the side is fixedly connected to one end of the L-shaped curved rod 14;

[0044] It also includes a driving assembly, which is used to drive the L-shaped curved rod 14 to perform reciprocating motion.

[0045] According to the above embodiment, a specific embodiment of the injection assembly is provided. When the driving assembly drives the L-shaped curved rod 14 to move back and forth, it drives the piston 28 to move back and forth in the holder 15. Figure 6 At this time, the piston 28 moves to the right, pushing the wastewater sample in the holder 15 toward the needle. At the same time, the L-shaped curved rod 14 moves to the right, driving the sliding curved rod 13 to move together, pulling the tension spring 12 to stretch until the needle is inserted into the rubber stopper on the side of the test tube 24. Since the total amount of wastewater sample in the holder 15 is small, the piston 28 pushes the wastewater sample toward the needle for a distance, that is, after the needle is inserted into the test tube 24, the sample will be squeezed out from the needle into the test tube 24, avoiding the leakage of the wastewater sample and causing corrosion to the device itself. Then the driving assembly drives the L-shaped curved rod 14 to move to the left, and the sliding curved rod 13 also moves to the left under the action of the tension spring 12, completing the resetting of the injection assembly.

[0046] In this way, the L-shaped bent rod 14 is driven to move back and forth by the driving assembly, and the reciprocating movement of the piston 28 in the holder 15 can drive the needle to be inserted into or away from the test tube 24, and after the needle is inserted into the test tube 24, the wastewater sample is injected into the test tube 24 to complete the injection of the sample.

[0047] Furthermore, the drive assembly includes a driving gear 7 fixedly mounted on the outer wall of the driving shaft 6, and also includes a driven gear 8 rotatably mounted on the top of the partition 4 and meshing with the driving gear 7. A cam 9 and a rotating handle 10 are coaxially mounted on the top of the driven gear 8. The circular surface of the cam 9 can be abutted against the circular ring at the end of the L-shaped bent rod 14. A limit block 11 is rotatably mounted on the top end face of the rotating handle 10. A regular polygonal through groove is provided in the center of the rotating disk 16. A transverse groove is also provided at the end point of each regular polygon, and a plurality of test tubes 24 are respectively mounted in the corresponding transverse grooves. When the limit block 11 rotates with the rotating handle 10, it can be rotated into the transverse groove and drive the rotating disk 16 to rotate.

[0048] According to the above embodiment, a specific embodiment of a driving assembly is provided. When the motor 5 drives the driving shaft 6 to rotate eccentrically in the tank body 2, it drives the driving gear 7 and the driven gear 8 to rotate together. Figure 4 and Figure 7 At this time, the driven gear 8 drives the cam 9 and the rotating handle 10 to rotate together. When the circular surface of the cam 9 contacts the circular ring at the end of the L-shaped curved rod 14, the L-shaped curved rod 14 is driven to move to the left. When the circular surface of the cam 9 moves away from the circular ring at the end of the L-shaped curved rod 14, the L-shaped curved rod 14 is reset under the action of the tension spring 12, completing the reciprocating movement of the L-shaped curved rod 14. At the same time, the rotating handle 10 drives the limit block 11 to rotate into the horizontal groove in the rotating disk 16 and slide in the horizontal groove, driving the rotating disk 16 to rotate, completing the switching of the test tubes 24, so that the wastewater samples can be inserted into the test tubes 24 in turn, avoiding the detection reagent in a single test tube from being consumed too quickly.

[0049] In this way, by rotating the limit block 11 in and out of the transverse groove in the rotating disk 16 and driving the rotating disk 16 to rotate, the L-shaped curved rod 14 can drive the needle to insert into the gap of the test tube 24, drive the rotating disk 16 to rotate and switch the test tube 24 to separately detect wastewater samples at different stages.

[0050] Example 1:

[0051] Furthermore, the monitoring component includes an air bag 25 fixed on the top of the test tube 24. A trigger device is provided above the air bag 25. The trigger device is electrically connected to the liquid supply component.

[0052] According to the above embodiment, a specific embodiment of the detection component is provided. Since potassium permanganate solution is contained in the test tube 24, when the trivalent arsenic in the wastewater is completely oxidized to pentavalent arsenic, the excess hydrogen peroxide in the wastewater will enter the test tube 24 along with the sample and react with the potassium permanganate solution to produce oxygen and water, causing the airbag 25 connected to the top of the test tube 24 to expand. After the airbag 25 expands, it will squeeze the trigger device above (preferably a trigger switch). For details, see Figure 2At this time, the liquid supply component can be turned off by the trigger switch to stop the liquid supply component.

[0053] In this way, by continuously detecting whether there is any residual hydrogen peroxide in the wastewater sample, it is possible to determine whether the trivalent arsenic in the wastewater has been completely oxidized to pentavalent arsenic, and by shutting down the liquid supply component when excess hydrogen peroxide is detected, the purpose of preventing further excess hydrogen peroxide from affecting the pH value in the wastewater can be achieved.

[0054] Example 2:

[0055] Furthermore, the test tube 24 is made of a transparent material, and a monitor 27 fixedly mounted on the top of the partition 4 is provided below the test tube 24. The monitor 27 is electrically connected to the liquid supply component.

[0056] According to the above embodiment, a specific embodiment of a second detection component is provided. In this case, the detection reagent in the test tube 24 is preferably a color developer, such as mercuric bromide and cadmium reagent. When the wastewater sample enters the test tube 24, the color developer reacts with trivalent arsenic to form a colored complex. After the reaction, the generated complex will show a specific color, and the intensity of the color is proportional to the concentration of trivalent arsenic. At this time, the absorbance of the sample solution is compared with the standard curve through the monitor 27. The corresponding trivalent arsenic concentration is found on the standard curve according to the absorbance value, and the trivalent arsenic concentration in the wastewater sample can be detected. When no trivalent arsenic is detected in the wastewater or the impact of the trivalent arsenic concentration in the wastewater on the subsequent arsenic removal has been minimized, the liquid supply component can be closed by electrically connecting the monitor 27 to the liquid supply component, and the introduction of hydrogen peroxide into the tank 2 is stopped.

[0057] In this way, by directly detecting the concentration of trivalent arsenic in the wastewater sample, it is possible to more directly avoid excessive introduction of hydrogen peroxide into the wastewater, further reduce the possible excess of hydrogen peroxide in the wastewater, and thus reduce the possibility of hydrogen peroxide affecting the pH value of the wastewater.

[0058] Furthermore, a long stirring rod 21 and a short stirring rod 22 are fixedly installed on both sides of the rotating rod 18, and multiple sets of stirring fans are fixedly installed on the outer walls of the long stirring rod 21 and the short stirring rod 22. The long stirring rod 21 is connected to the interior of the tank body 2 and the rotating box 17 through the water inlet pipe 30, and a filter 26 is provided at the water inlet at the top of the long stirring rod 21.

[0059] According to the above embodiment, when the driving shaft 6 drives the rotating box 17 to rotate eccentrically, the rotating rod 18 will rotate in the tank body 2 while sliding back and forth. At this time, the rotating rod 18 drives the stirring long rod 21 and the stirring short rod 22 to rotate together while sliding back and forth, so that the stirring long rod 21 and the stirring short rod 22 can continuously perform irregular stirring in the wastewater, stirring the hydrogen peroxide introduced into the wastewater more evenly in the wastewater, further accelerating the reaction rate of hydrogen peroxide with trivalent arsenic in the wastewater, and the original water inlet is replaced by the top of the stirring long rod 21, and the filter 26 is used to block floating objects in the water to prevent floating objects from entering the pipeline and causing blockage of the pipeline, so that the sampling mechanism cannot take samples normally.

[0060] Furthermore, the liquid supply component includes a rotating ring 23 rotatably mounted on the outer wall of the driving shaft 6, and an annular groove is provided in the rotating ring 23. The annular groove of the rotating ring 23 is connected to the external liquid supply equipment, and the annular groove is connected to the rotating box 17 through the liquid inlet pipe 29 buried in the driving shaft 6. The stirring short rod 22 is connected to the interior of the tank body 2 through the liquid outlet pipe 31 buried in the rotating rod 18 and the stirring short rod 22, and a one-way liquid outlet valve is provided at the liquid outlet on the top surface of the stirring short rod 22.

[0061] According to the above embodiment, when the piston plate 20 squeezes the wastewater sample out of the rotating box 17, the space at the other end of the piston plate 20 will be increased, and hydrogen peroxide will be sucked from the rotating ring 23 from the external liquid supply device into the rotating box 17. At the same time as the piston plate 20 sucks the wastewater sample into the rotating box 17, hydrogen peroxide is squeezed out from the liquid outlet on the top surface of the stirring short rod 22 into the tank body 2, and the irregular stirring mentioned above is combined to evenly disperse the hydrogen peroxide in the wastewater, so that the hydrogen peroxide and the trivalent arsenic in the wastewater can fully react.

[0062] Furthermore, the water inlet on the top surface of the long stirring rod 21 is arranged below the liquid level of the wastewater, and the liquid outlet on the top surface of the short stirring rod 22 is arranged in the middle or bottom of the wastewater.

[0063] According to the above embodiment, since the heights of the long stirring rod 21 and the short stirring rod 22 are inconsistent, on the premise of enhancing irregular stirring to make the solution mixed more fully, the height inconsistency between the wastewater inlet and the hydrogen peroxide outlet can also be utilized, so that the trivalent arsenic in the wastewater will be completely oxidized to pentavalent arsenic before hydrogen peroxide is detected in the test tube, thereby avoiding accidental triggering of the trigger switch due to uneven concentration, causing the liquid supply component to terminate the supply prematurely.

[0064] Furthermore, pulleys 19 are rotatably mounted on both ends of the rotating rod 18 and are capable of sliding in annular grooves provided on the inner wall of the tank body 2 .

[0065] According to the above embodiment, when the rotating rod 18 slides in the annular groove, the friction between the rotating rod 18 and the inner wall of the tank body 2 can be eliminated by the pulley 19, thereby avoiding excessive friction causing the device to get stuck, or excessive friction heat causing excessive temperature changes in the wastewater, thereby affecting the subsequent precipitation of pentavalent arsenic.

[0066] The standard parts used in this embodiment can be purchased directly from the market, and the non-standard structural components recorded in the specification and drawings can also be directly processed according to existing technical common sense without any doubt. At the same time, the connection method of each component adopts the mature conventional means in the existing technology, and the machinery, parts and equipment all adopt conventional models in the existing technology, so no specific description will be given here.

[0067] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. An arsenic-containing wastewater treatment device, comprising a bracket (1) and a tank (2) fixedly mounted in the bracket (1), characterized in that: A partition (4) is fixedly installed in the tank body (2); It also includes a liquid supply component, which is used to intermittently introduce an oxidant into the wastewater below the partition (4); Also included is a sampling assembly for intermittently sampling the wastewater; Also included is a monitoring component for monitoring the status of the wastewater sample; The sampling assembly includes a mounting plate (3) fixedly mounted on the bottom of the tank body (2), a motor (5) fixedly mounted on the bottom surface of the mounting plate (3), a driving shaft of the motor (5) that penetrates into the tank body (2) is fixedly connected to a driving shaft (6), and the driving shaft (6) and the tank body (2) are eccentrically arranged, a portion of the driving shaft (6) that penetrates the partition (4) is sealed and rotatably connected to a holder (15) fixedly mounted on the inner wall of the tank body (2), a rotating box (17) is fixedly mounted in the middle of the driving shaft (6), a piston plate (20) is slidably mounted in the rotating box (17), an annular groove is provided on the inner wall of the tank body (2), and the A rotating rod (18) is fixedly installed on the outer wall of the piston plate (20), which penetrates the rotating box (17) and has both ends respectively embedded in the annular groove and can contact and abut against the inner wall of the tank body (2). The rotating box (17) and the holder (15) are in one-way communication through the upper water pipe (32). The space on one side of the piston plate (20) is in one-way communication with the inside of the tank body (2) through the water inlet pipe (30) buried in the rotating rod (18). A rotating disk (16) is rotatably installed on the inner wall of the tank body (2). A plurality of test tubes (24) distributed in an annular shape are fixedly installed in the rotating disk (16). The test tubes (24) are T-shaped and contain detection reagents. Also included is an injection assembly for injecting the wastewater sample in the holder (15) into the test tube (24); The injection assembly includes a sliding curved rod (13) slidably mounted in a holder (15), a tension spring (12) fixedly mounted between the holder (15) and the inner wall of the tank body (2) and sleeved on the outer wall of the sliding curved rod (13), a piston (28) slidably mounted on the inner wall of the holder (15), an L-shaped curved rod (14) penetrating the holder (15) and having one end fixedly connected to the sliding curved rod (13) fixedly mounted on the outer wall of the piston (28), and a needle capable of being inserted into the test tube (24) from the side fixedly connected to one end of the L-shaped curved rod (14); It also includes a driving assembly, which is used to drive the L-shaped curved rod (14) to perform reciprocating motion; A long stirring rod (21) and a short stirring rod (22) are fixedly mounted on both sides of the rotating rod (18), and multiple groups of stirring fans are fixedly mounted on the outer walls of the long stirring rod (21) and the short stirring rod (22). The long stirring rod (21) is connected to the interior of the tank body (2) and the rotating box (17) through a water inlet pipe (30), and a filter screen (26) is provided at the water inlet at the top of the long stirring rod (21); The liquid supply assembly comprises a rotating ring (23) rotatably mounted on the outer wall of the driving shaft (6), an annular groove is provided in the rotating ring (23), the annular groove of the rotating ring (23) is communicated with an external liquid supply device, the annular groove is communicated with the inside of the rotating box (17) through a liquid inlet pipe (29) buried in the driving shaft (6), the stirring short rod (22) is communicated with the inside of the tank body (2) through a liquid outlet pipe (31) buried in the rotating rod (18) and the stirring short rod (22), and a one-way liquid outlet valve is provided at the liquid outlet on the top surface of the stirring short rod (22).

2. The arsenic-containing wastewater treatment device according to claim 1, characterized in that: The driving assembly comprises a driving gear (7) fixedly mounted on the outer wall of the driving shaft (6), and a driven gear (8) rotatably mounted on the top of the partition (4) and meshing with the driving gear (7). A cam (9) and a rotating handle (10) are coaxially mounted on the top of the driven gear (8). The circular surface of the cam (9) can abut against the circular ring at the end of the L-shaped curved rod (14). A limit block (11) is rotatably mounted on the top end face of the rotating handle (10). A regular polygonal through groove is provided at the center of the rotating disk (16). The through groove further comprises a transverse groove at the end point of each regular polygon, and a plurality of test tubes (24) are respectively mounted in the corresponding transverse grooves. When the limit block (11) rotates with the rotating handle (10), it can be rotated into the transverse groove and drive the rotating disk (16) to rotate.

3. The arsenic-containing wastewater treatment device according to any one of claims 1-2, characterized in that: The monitoring component comprises an air bag (25) fixed on the top of the test tube (24), a trigger device is provided above the air bag (25), and the trigger device is electrically connected to the liquid supply component.

4. The arsenic-containing wastewater treatment device according to any one of claims 1-2, characterized in that: The test tube (24) is made of a transparent material. A monitor (27) fixedly mounted on the top of the partition (4) is provided below the test tube (24). The monitor (27) is electrically connected to the liquid supply component.

5. The arsenic-containing wastewater treatment device according to claim 4, characterized in that: The water inlet on the top surface of the long stirring rod (21) is arranged below the wastewater liquid level, and the liquid outlet on the top surface of the short stirring rod (22) is arranged in the middle or bottom of the wastewater.

6. The arsenic-containing wastewater treatment device according to claim 1, characterized in that: Pulleys (19) that can slide in annular grooves formed on the inner wall of the tank body (2) are rotatably mounted on both ends of the rotating rod (18).

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