Wastewater thallium removal device and wastewater thallium removal method

Abstract

The invention provides a wastewater thallium removal device and a wastewater thallium removal method, belongs to the technical field of wastewater treatment, and mainly aims to realize uniform distribution of an oxidizing agent in to-be-treated wastewater. Specifically, the device for removing thallium from wastewater comprises a reaction kettle and a stirring assembly, the reaction kettle is used for injecting to-be-treated wastewater; the stirring assembly comprises a rotatable part, and the rotatable part is arranged in the reaction kettle; the rotatable part comprises a stirring rod, a stirring paddle and a second air outlet pipe; the stirring rod is of a hollow structure to form a gas inlet channel, and the gas inlet channel is used for introducing an oxidizing agent; the stirring paddle is located at the bottom of the stirring rod, a first air outlet pipe is arranged on the stirring paddle, and the first air outlet pipe extends in the radial direction of the stirring paddle and communicates with the air inlet channel; a plurality of first air outlet holes are formed in the first air outlet pipe, the second air outlet pipe is arranged on the peripheral surface of the stirring rod, the second air outlet pipe extends in the axial direction of the stirring rod and communicates with the air inlet channel, and a plurality of second air outlet holes are formed in the second air outlet pipe.

Description

Technical Field

[0001] The present application belongs to the technical field of wastewater treatment, and specifically relates to a wastewater thallium removal device and a wastewater thallium removal method. Background Art

[0002] With the acceleration of industrialization, the scale of mining, metallurgy, chemical industry and other industries has continued to expand, and the discharge of thallium-containing wastewater has increased. Thallium is a highly toxic heavy metal, and direct discharge will pose a serious threat to the ecological environment and human health.

[0003] At present, there are many traditional technologies for treating thallium-containing wastewater, but they generally have significant defects. In terms of oxidant utilization, most existing devices and methods use simple aeration or direct addition of oxidants, resulting in extremely uneven distribution of oxidants in wastewater. The oxidant concentration in some areas is too high, resulting in a waste of resources; while in some areas, due to insufficient oxidants, the oxidation reaction of thallium cannot be fully carried out, greatly reducing the efficiency of thallium removal.

[0004] From the perspective of thallium removal efficiency, due to the poor mixing effect of wastewater and oxidants and insufficient chemical reaction, many traditional processes require a long reaction time to achieve a certain thallium removal effect. This not only limits the scale and speed of wastewater treatment, but also increases the treatment cost.

[0005] In terms of cost control, traditional processes often require a large amount of thallium removal agents to meet emission standards. This not only increases the cost of raw material procurement, but also produces a large amount of secondary pollutants such as chemical sludge. The subsequent treatment of these secondary pollutants further increases the treatment cost, while also creating new pressure on the environment, which runs counter to the concept of green development. Summary of the invention

[0006] In view of this, the present application provides a wastewater thallium removal device and a wastewater thallium removal method, which can achieve uniform distribution of the oxidant in the wastewater to be treated, give full play to its oxidizing effect, and thus significantly improve the thallium removal efficiency, while effectively reducing the amount of thallium removal agent used, while ensuring efficient thallium removal, reducing processing costs and resource waste.

[0007] In order to achieve the above objectives, this application mainly provides the following technical solutions:

[0008] One aspect of the present application provides a wastewater thallium removal device, comprising:

[0009] Reactor and stirring assembly;

[0010] The reactor is used to inject wastewater to be treated;

[0011] The stirring assembly includes a rotatable portion, and the rotatable portion is disposed in the reaction kettle;

[0012] The rotatable part includes a stirring rod, a stirring paddle and a second air outlet pipe;

[0013] The stirring rod is a hollow structure to form an air inlet channel, and the air inlet channel is used to introduce an oxidant;

[0014] The stirring paddle is located at the bottom of the stirring rod, and a first air outlet pipe is provided on the stirring paddle. The first air outlet pipe extends along the radial direction of the stirring paddle and is connected to the air inlet channel. A plurality of first air outlet holes are opened on the first air outlet pipe;

[0015] The second air outlet pipe is arranged on the outer peripheral surface of the stirring rod, the second air outlet pipe extends along the axial direction of the stirring rod and is connected with the air inlet channel, and a plurality of second air outlet holes are opened on the second air outlet pipe.

[0016] Optionally, the stirring assembly further comprises:

[0017] A third air outlet pipe, the third air outlet pipe includes two parts located outside and inside the reactor, the part of the third air outlet pipe located outside the reactor is used to connect to the oxidant gas source, the part of the third air outlet pipe located inside the reactor is attached to the inner wall of the reactor and extends along the axial direction of the stirring rod, and a plurality of third air outlet holes are opened on the part of the third air outlet pipe located inside the reactor.

[0018] Optionally, at least two of the first air outlet pipe, the second air outlet pipe and the third air outlet pipe are provided, at least two of the first air outlet pipes are evenly arranged along the circumferential direction of the stirring paddle, at least two of the second air outlet pipes are evenly arranged along the circumferential direction of the stirring rod, and at least two of the third air outlet pipes are evenly arranged along the circumferential direction of the reactor.

[0019] Optionally, the reactor comprises:

[0020] Kettle cover and kettle body;

[0021] The kettle cover is located at the top of the reactor, and is provided with a liquid inlet and an exhaust port, and the rotatable part of the stirring assembly passes through the kettle cover and extends into the kettle body;

[0022] The kettle body is connected to the kettle cover, and a liquid outlet is arranged at the bottom of the kettle body.

[0023] Optionally, a pressure monitoring element is further provided on the reactor cover, and the pressure monitoring element is used to monitor the pressure in the reactor in real time.

[0024] Optionally, a sealing ring is provided at the connection between the kettle cover and the kettle body, and the sealing ring is made of elastic material.

[0025] Another aspect of the present application provides a method for removing thallium from wastewater, wherein the wastewater to be treated is treated using any one of the wastewater thallium removal devices described above;

[0026] The wastewater thallium removal method comprises:

[0027] injecting the wastewater to be treated into the reactor;

[0028] Turning on the stirring assembly;

[0029] Passing the oxidant into the reactor;

[0030] Half an hour before the end of the reaction, adding a curing agent into the reactor;

[0031] After the reaction is completed, the treated liquid is discharged and filtered, and the filtrate is subjected to chemical analysis, and based on the test results, it is determined whether to add a thallium removal agent to the filtrate.

[0032] Optionally, before injecting the wastewater to be treated into the reactor, the wastewater thallium removal method further comprises:

[0033] The pH value of the wastewater to be treated is adjusted to a range of 3.5 to 4.5.

[0034] Optionally, after the reaction is completed, the treated liquid is discharged and filtered, and the filtrate is subjected to chemical analysis, and after determining whether to add a thallium removal agent to the filtrate based on the test results, the wastewater thallium removal method further comprises:

[0035] The pH value of the filtrate is adjusted to a range of 4.5 to 5.5.

[0036] Optionally, the oxidant is ozone, the dosage of the ozone is 10 to 30 g / L of the wastewater to be treated, and the reaction time of the ozone and the wastewater to be treated is 1 to 3 hours.

[0037] By means of the above technical solution, the present application has at least the following beneficial effects:

[0038] The wastewater thallium removal device and wastewater thallium removal method provided in the embodiment of the present application form an air inlet channel by setting the stirring rod as a hollow structure, so that the oxidant can enter the first air outlet pipe and the second air outlet pipe through the air inlet channel. The first air outlet pipe extends radially along the stirring paddle, and the second air outlet pipe extends axially along the stirring rod, and a plurality of air outlet holes are respectively provided. When the stirring assembly rotates, the oxidant can be uniformly released into the wastewater to be treated from different directions and positions, thereby improving the dispersion effect of the oxidant in the wastewater to be treated. At the same time, the rotation of the stirring assembly puts the wastewater to be treated in a flowing state, prolongs the contact time between the oxidant and the wastewater to be treated, and is conducive to the full oxidation reaction. Further, since the oxidant can contact and fully react with the wastewater to be treated more uniformly, the thallium ions can be more effectively oxidized into a form that is easy to precipitate or remove, thereby improving the thallium removal efficiency. Within the same reaction time, a higher thallium removal rate can be achieved, or when the same thallium removal effect is achieved, the reaction time can be shortened to improve the treatment efficiency. In addition, the efficient oxidation process makes the removal of thallium more thorough, reducing the amount of additional thallium removal agent required for further removal of thallium, thereby reducing processing costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0039] Figure 1 This is a schematic structural diagram of a wastewater thallium removal device according to an optional embodiment of the present application;

[0040] Figure 2 This is a flow chart of a method for removing thallium from wastewater according to an optional embodiment of the present application.

[0041] The reference numerals are:

[0042] 1. Reactor; 11. Reactor cover; 12. Reactor body; 2. Stirring assembly; 21. Stirring rod; 211. Air inlet channel; 22. Stirring paddle; 23. First air outlet pipe; 24. Second air outlet pipe; 25. Third air outlet pipe; 3. Liquid inlet; 4. Air outlet; 5. Liquid outlet; 6. Pressure monitoring element; 7. Sealing ring. DETAILED DESCRIPTION

[0043] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise" and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0044] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0045] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0046] The preferred embodiments of the present application are described below in conjunction with the accompanying drawings. It should be understood that the preferred embodiments described herein are only used to illustrate and explain the present application and are not used to limit the present application.

[0047] See also Figure 1 As shown, according to an embodiment of the present application, a wastewater thallium removal device is provided, including a reactor 1 and a stirring assembly 2; the reactor 1 is used to inject wastewater to be treated; the stirring assembly 2 includes a rotatable part, and the rotatable part is arranged in the reactor 1; the rotatable part includes a stirring rod 21, a stirring paddle 22 and a second air outlet pipe 24; the stirring rod 21 is a hollow structure to form an air inlet channel 211, and the air inlet channel 211 is used to introduce an oxidant; the stirring paddle 22 is located at the bottom of the stirring rod 21, and a first air outlet pipe 23 is arranged on the stirring paddle 22, and the first air outlet pipe 23 extends in the radial direction of the stirring paddle 22 and is connected to the air inlet channel 211; a plurality of first air outlet holes are opened on the first air outlet pipe 23, and a second air outlet pipe 24 is arranged on the outer peripheral surface of the stirring rod 21, and the second air outlet pipe 24 extends in the axial direction of the stirring rod 21 and is connected to the air inlet channel 211, and a plurality of second air outlet holes are opened on the second air outlet pipe 24.

[0048] In this embodiment, the stirring rod 21 is set to a hollow structure to form an air inlet channel 211, so that the oxidant can enter the first air outlet pipe 23 and the second air outlet pipe 24 through the air inlet channel 211. The first air outlet pipe 23 extends radially along the stirring paddle 22, and the second air outlet pipe 24 extends axially along the stirring rod 21, and a plurality of air outlet holes are respectively provided. When the stirring assembly 2 rotates, the oxidant can be uniformly released into the wastewater to be treated from different directions and positions, thereby improving the dispersion effect of the oxidant in the wastewater to be treated. At the same time, the rotation of the stirring assembly 2 puts the wastewater to be treated in a flowing state, prolongs the contact time between the oxidant and the wastewater to be treated, and is conducive to the full oxidation reaction. Further, since the oxidant can contact and fully react with the wastewater to be treated more uniformly, the thallium ions can be more effectively oxidized into a form that is easy to precipitate or remove, thereby improving the thallium removal efficiency. In the same reaction time, a higher thallium removal rate can be achieved, or when the same thallium removal effect is achieved, the reaction time can be shortened to improve the treatment efficiency. In addition, the efficient oxidation process makes the removal of thallium more thorough, reducing the amount of additional thallium removal agent required for further removal of thallium, thereby reducing processing costs.

[0049] The reactor 1 is roughly cylindrical and is used to provide a relatively closed space for the wastewater thallium removal reaction, so that the wastewater to be treated is injected into the reactor 1 for thallium removal treatment.

[0050] Among them, the stirring component 2 includes a driving part and a rotatable part. The driving part is the power source of the stirring component 2. The driving part is connected to the rotatable part. The rotatable part is arranged in the reactor 1. The driving part is used to drive the rotatable part to rotate in the reactor 1, thereby driving the flow of the wastewater to be treated injected into the reactor 1, and enhancing the contact and mixing effect between the wastewater to be treated and the oxidant.

[0051] Specifically, the rotatable part includes a stirring rod 21, which is a hollow structure, so that the hollow interior of the stirring rod 21 can form an air inlet channel 211. The air inlet channel 211 is a channel for the oxidant to enter the reactor 1, and the external oxidant, such as ozone, can be transported to the reactor 1 through the air inlet channel 211. Further, the rotatable part also includes a stirring paddle 22, which is located at the bottom of the stirring rod 21. When the stirring rod 21 rotates, the stirring paddle 22 will rotate together. A first air outlet pipe 23 is provided on the stirring paddle 22, and the first air outlet pipe 23 extends along the radial direction of the stirring paddle 22, and the first air outlet pipe 23 is connected to the air inlet channel 211 of the stirring rod 21, so that the oxidant transported from the air inlet channel 211 can enter the first air outlet pipe 23. A plurality of first air outlet holes are provided on the first air outlet pipe 23, and the oxidant can be released into the wastewater to be treated in the reactor 1 in the form of tiny bubbles through these first air outlet holes. Since the first air outlet pipe 23 extends radially, the oxidant can be dispersed more evenly on the horizontal plane of the wastewater to be treated. In addition, a second air outlet pipe 24 is provided on the outer peripheral surface of the stirring rod 21, and the second air outlet pipe 24 extends along the axial direction of the stirring rod 21. At the same time, the second air outlet pipe 24 is also connected to the air inlet channel 211 of the stirring rod 21, so that the oxidant can also flow into the second air outlet pipe 24 from the air inlet channel 211. The second air outlet pipe 24 is provided with a plurality of second air outlet holes, and the oxidant can be released into the wastewater to be treated in the form of tiny bubbles through these second air outlet holes. Since the second air outlet pipe 24 extends axially, the oxidant can be dispersed more evenly on the vertical plane of the wastewater to be treated.

[0052] Here, by applying the wastewater thallium removal device proposed in this embodiment, when the device starts to operate, the thallium-containing wastewater to be treated is injected into the reactor 1. Then, the oxidant is introduced into the reactor 1 through the air inlet channel 211, and the oxidant enters the first air outlet pipe 23 and the second air outlet pipe 24 respectively through the air inlet channel 211, and then is released into the thallium-containing wastewater in the form of tiny bubbles through the first air outlet and the second air outlet. At the same time, the rotatable part of the stirring assembly 2 starts to rotate, and the stirring rod 21 drives the stirring paddle 22 and the first air outlet pipe 23 and the second air outlet pipe 24 to rotate together, so that the thallium-containing wastewater forms a flow state in the reactor 1. It can be understood that this flow can not only make the oxidant released from different positions more evenly dispersed in the thallium-containing wastewater, but also increase the contact opportunity and contact time between the oxidant and the thallium ions in the thallium-containing wastewater, thereby promoting the oxidation reaction, oxidizing the thallium ions into a form that is easy to precipitate or remove, and achieving the purpose of removing thallium from the wastewater.

[0053] In some possible implementations disclosed in this application, see Figure 1As shown, the stirring assembly 2 also includes a third air outlet pipe 25, and the third air outlet pipe 25 includes two parts located outside and inside the reactor 1. The part of the third air outlet pipe 25 located outside the reactor 1 is used to connect to the oxidant gas source, and the part of the third air outlet pipe 25 located inside the reactor 1 is attached to the inner wall of the reactor 1 and extends along the axial direction of the stirring rod 21. At the same time, a plurality of third air outlet holes are opened on the part of the third air outlet pipe 25 located inside the reactor 1.

[0054] In this embodiment, the vicinity of the inner wall of the reactor 1 is a weak area for stirring and mixing. It is difficult to ensure that the wastewater to be treated in the edge area of ​​the reactor 1 can fully contact with the oxidant by only relying on the first air outlet pipe 23 on the stirring paddle and the second air outlet pipe 24 on the stirring rod 21 to release the oxidant. By setting the third air outlet pipe 25 located inside the reactor 1 to be attached to the inner wall of the reactor 1 and extending axially, the oxidant can be directly transported to the edge of the reactor 1 by using the third air outlet hole on the third air outlet pipe 25, which effectively makes up for this deficiency and makes the oxidant distribution in the entire reactor 1 more uniform. In addition, in combination with the first air outlet pipe 23, the second air outlet pipe 24 and the third air outlet pipe 25, the oxidant is released in three different directions: radial direction of the stirring paddle 22, axial direction of the stirring rod 21 and axial direction of the inner wall of the reactor 1. This multi-dimensional distribution method can construct a three-dimensional oxidant release network in the reactor 1, achieve all-round coverage of the wastewater to be treated, ensure that thallium ions at various positions in the wastewater to be treated have the opportunity to fully contact with the oxidant, and avoid the problem of incomplete thallium removal in some areas due to uneven distribution of the oxidant.

[0055] Among them, the third gas outlet pipe 25 is a new part of the stirring assembly 2, which consists of two parts located outside and inside the reactor 1. This internal and external structural design, on the one hand, is convenient for connecting the external oxidant gas source to ensure that the oxidant can smoothly enter the reactor 1; on the other hand, the oxidant is distributed in a specific manner inside the reactor 1 to achieve a better thallium removal effect.

[0056] Specifically, the third air outlet pipe 25 is located outside the reactor 1, and is mainly used to connect the oxidant gas source, such as the ozone gas source. In practical applications, the third air outlet pipe 25 is used to connect the reactor 1 with the external oxidant supply equipment, so that the oxidant can be continuously transported to the inside of the reactor 1, providing the necessary reactants for the thallium removal reaction. In other words, through this part of the pipeline, the external high-pressure oxidant (such as ozone generated by the ozone generator) can stably enter the reactor 1 to participate in wastewater treatment. The third air outlet pipe 25 is located inside the reactor 1, attached to the inner wall of the reactor 1, and extends along the axial direction of the stirring rod 21. On the one hand, it can make full use of the space inside the reactor 1; on the other hand, it helps to form a stable oxidant release path in the edge area of ​​the reactor 1, ensuring that wastewater at different positions in the reactor 1 can contact the oxidant. At the same time, a number of third air outlets are provided on this part of the pipeline. These third air outlets are direct channels for the oxidant to enter the wastewater to be treated. Through these third air outlets, the oxidant can be dispersed into the wastewater to be treated in the form of bubbles and undergo oxidation reaction with the thallium ions in the wastewater to be treated.

[0057] Here, by applying the wastewater thallium removal device proposed in this embodiment, the third air outlet pipe 25 cooperates with the stirring rod 21, the stirring paddle 22 and other air outlet pipes (the first air outlet pipe 23 and the second air outlet pipe 24) in the stirring assembly 2. The rotation of the stirring rod 21 and the stirring paddle 22 causes the wastewater to be treated to form a flow and stirring effect in the reactor 1, and the oxidant bubbles released by the third air outlet pipe 25 further disturb the wastewater to be treated during the rising process in the wastewater to be treated, thereby enhancing the mixing effect. At the same time, the first air outlet pipe 23 and the second air outlet pipe 24 release the oxidant from the radial direction of the stirring paddle 22 and the axial direction of the stirring rod 21, respectively, and cooperate with the third air outlet pipe 25 to release the oxidant from the axial direction of the inner wall of the reactor 1, forming an all-round, three-dimensional oxidant distribution network, ensuring that the thallium ions in the wastewater to be treated can fully contact with the oxidant, thereby improving the thallium removal efficiency.

[0058] In some possible implementations disclosed in this application, see Figure 1 As shown, at least two first air outlet pipes 23, second air outlet pipes 24 and third air outlet pipes 25 are provided, at least two first air outlet pipes 23 are evenly arranged along the circumferential direction of the stirring paddle 22, at least two second air outlet pipes 24 are evenly arranged along the circumferential direction of the stirring rod 21, and at least two third air outlet pipes 25 are evenly arranged along the circumferential direction of the reactor 1.

[0059] In this embodiment, at least two first air outlet pipes 23 are evenly arranged along the circumferential direction of the stirring paddle 22, so that the oxidant sprayed from the radial direction of the stirring paddle 22 can be more evenly dispersed into the wastewater to be treated. When the stirring paddle 22 rotates, the oxidant sprayed from the first air outlet pipes 23 at different positions can be mixed with the wastewater to be treated in different areas, avoiding the situation where the local oxidant concentration is too high or too low, thereby improving the uniformity of mixing the wastewater to be treated and the oxidant in the vicinity of the stirring paddle 22, which is conducive to the full contact reaction between the thallium ions and the oxidant. At least two second air outlet pipes 24 are evenly arranged along the circumferential direction of the stirring rod 21, so that the oxidant can be evenly released into the wastewater to be treated along the axial direction of the stirring rod 21. During the rotation of the stirring rod 21, the oxidant sprayed from different second air outlet pipes 24 can form bubble flows at different positions around the stirring rod 21, promote the mixing of the wastewater to be treated in the axial direction, and make the reaction more uniform in the entire axial range of the stirring rod 21. At least two third air outlet pipes 25 are evenly arranged along the circumferential direction of the reactor 1, so that the oxidant can be evenly released around the inner wall of the reactor 1. Therefore, in the circumferential direction of the reactor 1, the wastewater to be treated at each position can evenly contact the oxidant, which makes up for the problem of insufficient oxidant distribution in the edge area that may exist when only the air outlet pipes on the stirring paddle 22 and the stirring rod 21 are used, and ensures the consistency of the overall oxidation environment in the reactor 1.

[0060] Here, two first air outlet pipes 23 and two second air outlet pipes 24 are provided, and four third air outlet pipes 25 are provided.

[0061] In some possible implementations disclosed in this application, see Figure 1 As shown, the reactor 1 includes a reactor cover 11 and a reactor body 12; the reactor cover 11 is located at the top of the reactor 1, and is provided with a liquid inlet 3 and an exhaust port 4, and the rotatable part of the stirring assembly 2 passes through the reactor cover 11 and extends into the reactor body 12; the reactor body 12 is connected to the reactor cover 11, and a liquid outlet 5 is provided at the bottom of the reactor body 12.

[0062] Among them, the liquid inlet 3 located on the top of the kettle cover 11 allows the wastewater to be treated to flow into the reactor 1 from top to bottom, utilizing the effect of gravity to a certain extent, and can enter the reactor 1 more smoothly, reducing the splashing phenomenon that may be caused by the wastewater to be treated entering from the side or other positions, reducing the loss of wastewater to be treated and the risk of pollution to the external environment of the reactor 1, and also improving the safety of operation.

[0063] Among them, the gas atmosphere in the reactor 1 can be adjusted through the exhaust port 4, and the gas that is not conducive to the reaction can be discharged to maintain the specific gas environment required for the reaction. For example, if the reaction needs to be carried out in an anaerobic or hypoxic environment, the exhaust port 4 can timely discharge the oxygen generated during the reaction, or the air in the reactor 1 can be discharged through the exhaust port 4 before the reaction to create the required anaerobic or hypoxic conditions, which is conducive to improving the efficiency and selectivity of the thallium removal reaction and promoting the specific thallium removal reaction.

[0064] Among them, the rotatable part of the stirring component 2 can extend into the kettle body 12 through the kettle cover 11, so that the stirring paddle 22 and other components can stir the wastewater to be treated in the kettle body 12. By stirring, the thallium in the wastewater to be treated can be fully mixed and contacted with the added oxidant and other agents, which can accelerate the reaction rate, improve the efficiency of thallium removal, and make the thallium removal reaction more thorough. At the same time, stirring can also make the temperature, concentration and other distributions in the reaction system more uniform, avoid local overheating or over-concentration, and help improve the stability of the reaction and product quality. In addition, this structural design makes the installation and disassembly of the stirring component 2 relatively convenient. During installation, the kettle cover 11 can be opened first, and the rotatable part of the stirring component 2 can be inserted into the kettle body 12 from above the kettle cover 11, and then fixed and debugged; when the stirring component 2 needs to be maintained or replaced, it can also be easily removed by opening the kettle cover 11, which reduces the maintenance difficulty and cost of the equipment and improves the maintainability and service life of the equipment.

[0065] The liquid outlet 5 is arranged at the bottom of the kettle 12. By gravity, the liquid after the reaction can naturally flow out from the liquid outlet 5, so that the wastewater after thallium removal can be discharged from the reactor 1 and enter the subsequent treatment process or discharge link. Compared with the liquid discharge from the side or other positions, the bottom liquid outlet 5 can discharge the liquid in the kettle 12 more thoroughly, reduce the residue, and improve the efficiency and completeness of the liquid discharge.

[0066] In some possible implementations disclosed in this application, see Figure 1 As shown, a pressure monitoring element 6 is also provided on the reactor cover 11 , and the pressure monitoring element 6 is used to monitor the pressure in the reactor 1 in real time.

[0067] In this embodiment, by setting the pressure monitoring element 6, the pressure change in the reactor 1 can be monitored in real time. Once the pressure exceeds the preset safety threshold, an alarm can be issued in time to remind the operator to take corresponding measures, such as adjusting the reaction conditions, releasing the pressure, etc., so as to effectively avoid the occurrence of overpressure danger and ensure the safety of the production process. In addition, by setting the pressure monitoring element 6, small fluctuations in pressure can also be found in time and fed back to the user. The user can adjust relevant parameters such as air intake, stirring speed, etc. according to these feedback information to maintain the stability of the pressure in the reactor 1, and ensure that the reaction is carried out continuously and stably under the set conditions, so as to ensure that the thallium removal effect is consistent when the wastewater is treated each time.

[0068] Here, the pressure monitoring element 6 may be a pressure gauge.

[0069] In some possible implementations disclosed in this application, see Figure 1 As shown, a sealing ring 7 is provided at the connection between the kettle cover 11 and the kettle body 12, and the sealing ring 7 is made of elastic material.

[0070] In this embodiment, the sealing ring 7 is provided to ensure the sealing of the reactor 1, and prevent the liquid, gas and other substances in the reactor 1 from leaking to the external environment. At the same time, it can also effectively prevent the external air, dust and other impurities from entering the reactor 1, ensuring that the reaction is carried out in a relatively pure environment.

[0071] The sealing ring 7 is located on the contact surface between the kettle cover 11 and the kettle body 12, and plays the role of filling and sealing.

[0072] Specifically, the sealing ring 7 can be made of rubber, silicone, fluororubber, etc. In practical applications, when the kettle cover 11 is connected and tightened with the kettle body 12, the elastic sealing ring 7 will be squeezed, and its elastic deformation enables it to be tightly filled in the small gap between the kettle cover 11 and the kettle body 12, forming an effective sealing barrier to prevent liquid, gas and other substances in the reactor 1 from leaking to the outside, and also prevent impurities such as air, dust, moisture and the like from entering the reactor 1, thereby ensuring the purity and stability of the reaction environment.

[0073] Further, in order to fully illustrate the specific implementation process of the wastewater thallium removal device, a wastewater thallium removal method is provided, see Figure 2 As shown, the method includes:

[0074] Step S101: injecting the wastewater to be treated into the reactor 1.

[0075] The wastewater to be treated can be transported to the reactor 1 through a pipeline connected to the liquid inlet 3 under the action of a pump.

[0076] Step S102: Turn on the stirring component 2.

[0077] The stirring assembly 2 is composed of a driving part and a rotatable part. The driving part (such as a motor) can be started to provide power to make the rotatable part (including the stirring rod 21, the stirring paddle 22 and the second air outlet pipe 24, etc.) rotate in the reactor 1.

[0078] Step S103: introducing an oxidant into the reaction kettle 1.

[0079] The oxidant may enter the reactor 1 through the air inlet channel 211 of the stirring rod 21 and the portion of the third air outlet pipe 25 located outside the reactor 1 .

[0080] Step S104: half an hour before the end of the reaction, add a curing agent into the reactor 1.

[0081] The curing agent may be lime, and the lime may be added into the reactor 1 through the liquid inlet 3 or a feed port additionally provided on the reactor cover 11 .

[0082] Step S105: After the reaction is completed, the treated liquid is discharged and filtered, and the filtrate is subjected to chemical analysis, and based on the test results, it is determined whether to add a thallium removal agent to the filtrate.

[0083] Among them, the bottom of the reactor 1 is provided with a liquid outlet 5. After the reaction is completed, the treated liquid can be discharged from the reactor 1 through the liquid outlet 5. The discharged liquid enters the filtering device, which can be an independent device matched with the reactor 1, such as a filter press. The filtrate is transported to the testing and analysis equipment (such as an atomic absorption spectrometer, etc.) through a pipeline for detection.

[0084] Specifically, the treated liquid is discharged and filtered, and the solid precipitate formed during the reaction can be separated from the liquid to obtain a relatively clear filtrate. The test analysis can accurately detect the thallium content in the filtrate. If the test results show that the thallium content still does not meet the discharge standard, a thallium removal agent (such as sodium sulfide, JS-1) is added to the filtrate for further treatment according to the judgment results to ensure that the wastewater finally discharged meets environmental protection requirements.

[0085] Further, as a refinement and extension of the specific implementation of the above embodiment, in order to fully illustrate the specific implementation process of this embodiment, another method for removing thallium from wastewater is provided, which comprises:

[0086] Step S201: adjusting the pH value of the wastewater to be treated to a range of 3.4 to 4.5;

[0087] Step S202: injecting the wastewater to be treated into the reactor 1;

[0088] Step S203: start the stirring component 2;

[0089] Step S204: introducing an oxidant into the reaction vessel 1;

[0090] Step S205: half an hour before the end of the reaction, adding a curing agent into the reaction kettle 1;

[0091] Step S206: After the reaction is completed, the treated liquid is discharged and filtered, and the filtrate is subjected to chemical analysis, and based on the test results, it is determined whether to add a thallium removal agent to the filtrate;

[0092] Step S207: adjusting the pH value of the filtrate to a range of 4.5 to 5.5.

[0093] Among them, in step S201, the pH value of the wastewater to be treated can be adjusted to the range of 3.4 to 4.5 by adding alkaline agents (lime, calcium hydroxide) or acidic agents (sulfuric acid, hydrochloric acid). It should be noted that in the process of removing thallium from wastewater, the pH value of the wastewater to be treated is first adjusted to the range of 3.4 to 4.5, which can preliminarily remove or change the form of some interfering substances in the wastewater to be treated. For example, some metal ions may form complexes or ionic states under acidic conditions, which are more likely to react with other substances or be removed, thereby reducing the interference with the reaction of the oxidant and thallium ions in the subsequent oxidation reaction, so that the oxidant can react more attentively with the thallium ions and improve the efficiency of thallium removal.

[0094] Among them, in step S207, the pH value of the filtrate can be adjusted to the range of 4.5 to 5.5 by adding an alkaline agent (sodium hydroxide, calcium hydroxide, sodium carbonate). It should be noted that after the reaction in step S206 is completed, some heavy metal ions may have formed insoluble precipitates and been removed, but if the pH value of the filtrate is too low, some precipitated heavy metal ions may be redissolved in the solution. Adjusting the pH value of the filtrate to 4.5 to 5.5 can avoid the re-dissolution of precipitated heavy metal ions such as thallium ions due to excessive acidity, ensuring that the removed heavy metal ions can be stably separated from the filtrate and maintain a good heavy metal removal effect.

[0095] In some possible embodiments disclosed in the present application, the oxidant is ozone, and the amount of ozone used is 10 to 30 g / L. 待处理废水 The reaction time between ozone and wastewater to be treated is 1 to 3 hours.

[0096] It should be noted that the redox potential of ozone is +2.07eV, which is higher than the redox potential of monovalent thallium to trivalent thallium (+1.25eV). Based on this characteristic, ozone can be used to oxidize thallium ions and then removed by hydrolysis. In other words, in the process of removing thallium ions, no impurities harmful to zinc smelting will be introduced, providing an efficient and pure option for related treatment processes. The reaction equation is as follows:

[0097] Tl ++O 3 +2H + =Tl3++O 2 +H 2 O

[0098] Tl 3 ++3OH-=Tl(OH) 3 ↓

[0099] In some specific examples, the ozone dosage is 15g / L. 待处理废水 After 2 hours of reaction, a small amount of lime was added to the formed Tl(OH) 3 The solidified water is then filtered through a filter press connected to the outlet pipe. The filtrate is tested after filtration. Analysis of the test results shows that the thallium removal rate reaches 60%. A small amount of thallium removal agent (sodium sulfide, JS-1) is then added to reduce the thallium content of the recycled water to below 0.01 mg / L.

[0100] In some other specific examples, the ozone dosage is 25g / L. 待处理废水 After 2.5 hours of reaction, a small amount of lime was added to the formed Tl(OH) 3 The solidified water is then filtered through a filter press connected to the outlet pipe. The filtrate is tested after filtration. Analysis of the test results shows that the thallium removal rate reaches 70%. A small amount of thallium removal agent (sodium sulfide, JS-1) is then added to reduce the thallium content of the recycled water to below 0.01 mg / L.

[0101] It is easy for those skilled in the art to understand that the above-mentioned advantageous methods can be freely combined and superimposed without conflict.

[0102] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements and improvements made within the spirit and principles of the present application shall be included in the protection scope of the present application. The above are only preferred implementations of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present application, and these improvements and variations should also be regarded as the protection scope of the present application.

Claims

1. A wastewater thallium removal device, characterized in that: include: A reaction kettle (1) and a stirring assembly (2); The reactor (1) is used to inject wastewater to be treated; The stirring assembly (2) comprises a rotatable part, and the rotatable part is arranged in the reaction kettle (1); The rotatable part comprises a stirring rod (21), a stirring paddle (22) and a second air outlet pipe (24); The stirring rod (21) is a hollow structure to form an air inlet channel (211), and the air inlet channel (211) is used to introduce an oxidant; The stirring paddle (22) is located at the bottom of the stirring rod (21), and a first air outlet pipe (23) is provided on the stirring paddle (22). The first air outlet pipe (23) extends along the radial direction of the stirring paddle (22) and is connected to the air inlet channel (211). A plurality of first air outlet holes are provided on the first air outlet pipe (23); The second air outlet pipe (24) is arranged on the outer peripheral surface of the stirring rod (21), the second air outlet pipe (24) extends along the axial direction of the stirring rod (21) and is connected to the air inlet channel (211), and a plurality of second air outlet holes are provided on the second air outlet pipe (24).

2. The wastewater thallium removal device according to claim 1, characterized in that: The stirring assembly (2) further comprises: A third air outlet pipe (25), the third air outlet pipe (25) comprises two parts located outside and inside the reactor (1), the part of the third air outlet pipe (25) located outside the reactor (1) is used to connect to the oxidant gas source, the part of the third air outlet pipe (25) located inside the reactor (1) is attached to the inner wall of the reactor (1) and extends along the axial direction of the stirring rod (21), and a plurality of third air outlet holes are provided on the part of the third air outlet pipe (25) located inside the reactor (1).

3. The wastewater thallium removal device according to claim 2, characterized in that: At least two of the first air outlet pipe (23), the second air outlet pipe (24) and the third air outlet pipe (25) are provided, at least two of the first air outlet pipes (23) are evenly arranged along the circumferential direction of the stirring paddle (22), at least two of the second air outlet pipes (24) are evenly arranged along the circumferential direction of the stirring rod (21), and at least two of the third air outlet pipes (25) are evenly arranged along the circumferential direction of the reaction kettle (1).

4. The wastewater thallium removal device according to claim 1, characterized in that: The reactor (1) comprises: A kettle cover (11) and a kettle body (12); The kettle cover (11) is located at the top of the reaction kettle (1), and is provided with a liquid inlet (3) and an exhaust port (4). The rotatable part of the stirring assembly (2) passes through the kettle cover (11) and extends into the kettle body (12); The kettle body (12) is connected to the kettle cover (11), and a liquid outlet (5) is provided at the bottom of the kettle body (12).

5. The wastewater thallium removal device according to claim 4, characterized in that: The kettle cover (11) is also provided with a pressure monitoring element (6), and the pressure monitoring element (6) is used to monitor the pressure in the reaction kettle (1) in real time.

6. The wastewater thallium removal device according to claim 4, characterized in that: A sealing ring (7) is provided at the connection between the kettle cover (11) and the kettle body (12), and the sealing ring (7) is made of elastic material.

7. A method for removing thallium from wastewater, characterized in that: The wastewater to be treated is treated using the wastewater thallium removal device as described in any one of claims 1 to 6; The wastewater thallium removal method comprises: injecting the wastewater to be treated into the reactor (1); Turning on the stirring component (2); Passing the oxidant into the reaction kettle (1); Half an hour before the end of the reaction, adding a curing agent into the reaction kettle (1); After the reaction is completed, the treated liquid is discharged and filtered, and the filtrate is subjected to chemical analysis, and based on the test results, it is determined whether to add a thallium removal agent to the filtrate.

8. The method for removing thallium from wastewater according to claim 7, characterized in that: Before injecting the wastewater to be treated into the reactor (1), the wastewater thallium removal method further comprises: The pH value of the wastewater to be treated is adjusted to a range of 3.5 to 4.

5.

9. The method for removing thallium from wastewater according to claim 7, characterized in that: After the reaction is completed, the treated liquid is discharged and filtered, and the filtrate is subjected to chemical analysis. After determining whether to add a thallium removal agent to the filtrate based on the test results, the wastewater thallium removal method further includes: The pH value of the filtrate is adjusted to a range of 4.5 to 5.

5.

10. The method for removing thallium from wastewater according to claim 7, characterized in that: The oxidant is ozone, the dosage of the ozone is 10-30 g / L of the wastewater to be treated, and the reaction time of the ozone and the wastewater to be treated is 1-3 hours.

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