Wastewater treatment system

Abstract

The invention discloses a wastewater treatment system. The wastewater treatment system comprises a baffling pool, a first chemical distribution pipe, a circulating pool, a second chemical distribution pipe and a reduction assembly, the first chemical distribution pipe is used for providing a catalyst, the second chemical distribution pipe is used for providing an oxidizing agent, the circulating pool is connected with the liquid outlet end of the baffling pool, and a solution in the circulating pool can circularly flow; the reduction assembly is connected with the circulating pool and used for obtaining the solution in the circulating pool, conducting reduction treatment on the solution and conveying the solution subjected to reduction treatment back to the circulating pool. The stock solution and the catalyst are mixed in the flowing process of the baffling pool, and ferrous ions are fully hydrolyzed; in the circulating pool, a mixed solution of the stock solution and the catalyst is fully mixed with the oxidizing agent in the circulating flowing process of the solution, so that the stock solution is treated. The ferrous ions are mixed with the stock solution in the baffling area, so that a large amount of hydroxyl radicals can be prevented from being generated when the oxidant is input into the circulating pool, the condition that the hydroxyl radicals are vanished is avoided, the utilization rate of the catalyst and the oxidant is improved, and the medicine consumption is reduced.

Description

Technical Field

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

[0002] The Fenton reaction is carried out by the catalyst Fe 2+ Catalyze hydrogen peroxide to generate hydroxyl radicals (·OH), thereby initiating free radical reactions and degrading organic matter. The current Fenton reaction device usually mixes three streams of liquid, such as raw water, hydrogen peroxide, and ferrous sulfate, through a pipeline mixer or a water distribution device and then enters the reactor, and then adds stirring, aeration, and circulation to achieve full mixing of the raw water and the reagent. However, in its actual application process, short-circuiting occurs, that is, when the three streams of liquid are just mixed, hydrogen peroxide and Fe 2+ The mixing degree with raw water is low, and the concentrations of both in the mixed area are very high, while in Fe 2+ At high concentrations, hydrogen peroxide will quickly produce a large amount of active ·OH. The reaction of ·OH with the substrate is slow, and the unconsumed free ·OH accumulates. These ·OH react with each other to generate water, causing part of the initially generated ·OH to be destroyed, reducing the utilization rate of the catalyst and hydrogen peroxide and increasing drug consumption. Summary of the invention

[0003] Based on this, in order to solve the above technical problems, a wastewater treatment system is provided which can improve the utilization rate of catalyst and hydrogen peroxide and reduce the consumption of drugs.

[0004] The technical solution proposed in this application is: A wastewater treatment system, comprising: baffles; A first drug dispensing pipe is arranged at the liquid inlet end of the baffle tank and is used to provide a catalyst; A circulation pool connected to the liquid outlet of the baffle pool, wherein the solution in the circulation pool can circulate; A second drug distributing pipe is arranged in the circulation pool and spaced apart from the liquid outlet end of the baffle pool, and the second drug distributing pipe is used to provide an oxidant; The reduction component is connected to the circulation pool and is used to obtain the solution in the circulation pool and perform reduction treatment, and then transport the reduced solution back to the circulation pool.

[0005] Furthermore, the wastewater treatment system further comprises a guide tube and a circulation drive member, wherein the guide tube is arranged in the circulation pool to form a circulation channel in the circulation pool; the circulation drive member is arranged in the guide tube to guide the solution to circulate in the circulation channel; A first overflow port is provided at the liquid outlet end of the baffle tank, the first overflow port is communicated with the top of the circulation channel, and the second drug dispensing pipe is arranged at the bottom of the circulation channel.

[0006] Furthermore, the circulation driving member can guide the solution in the guide tube to flow toward the bottom of the circulation pool.

[0007] Furthermore, a second overflow port is provided on a side of the circulation pool away from the baffle pool; The liquid inlet end of the reduction component is communicated with the second overflow port, and the liquid outlet end of the reduction component is connected to the top of the circulation pool.

[0008] Furthermore, the reduction component includes a liquid inlet pipe, a reduction tower, a liquid return pump and a liquid return pipe. One end of the liquid inlet pipe is connected to the circulation pool, and the other end is connected to the reduction tower so that the liquid in the circulation pool enters the reduction tower. The reduction tower is used to perform reduction treatment on the solution. One end of the liquid return pump is connected to the reduction tower, and the other end is connected to the liquid return pipe. The end of the liquid return pipe away from the liquid return pump is connected to the circulation pool. The liquid return pump can guide the solution that has been reduced to be transported back to the circulation pool.

[0009] Furthermore, the reduction component also includes a circulation pipe, a first regulating valve and a second regulating valve, one end of the circulation pipe is connected to the end of the liquid return pump away from the reduction tower, and the other end of the circulation pipe is connected to the liquid inlet pipe, the first regulating valve is arranged on the liquid return pipe, and the second regulating valve is arranged on the circulation pipe to respectively adjust the flow of the liquid return pipe and the circulation pipe.

[0010] Furthermore, the reduction component includes a discharge pipe, a third regulating valve and a fourth regulating valve. The reduction tower is provided with a liquid outlet. The third regulating valve and the discharge pipe are both connected to the liquid outlet. The return liquid pump is connected to an end of the third regulating valve away from the reduction tower. The fourth regulating valve is arranged on the discharge pipe. The third regulating valve is used to adjust the flow of the return liquid pump, and the fourth regulating valve is used to adjust the flow of the discharge pipe.

[0011] Furthermore, the reduction component further comprises a filter and a check valve, and the filter and the check valve are sequentially arranged on the liquid inlet pipe along the solution conveying direction.

[0012] Furthermore, the reduction component also includes a sprayer, which is arranged in the circulation pool and connected to an end of the liquid return pipe away from the liquid return pump.

[0013] Furthermore, the reduction tower is provided with a liquid inlet space, a filler space and a buffer space arranged in sequence, the liquid inlet pipe is connected to the liquid inlet space, the liquid return pump is connected to the buffer space, and the filler space is filled with electron-rich fillers; The liquid inlet space is also provided with a reduction driving member, and the reduction driving member is used to guide the solution in the liquid inlet space to flow toward the filler space.

[0014] With the above-mentioned wastewater treatment system, the original wastewater liquid is input into the liquid inlet end of the baffle tank, and then flows into the circulation tank through the liquid outlet end of the baffle tank. The first drug distribution pipe inputs the catalyst into the original liquid, the original liquid and the catalyst are mixed during the flow of the baffle tank, and the ferrous ions are fully hydrolyzed; in the circulation tank, the second drug distribution pipe provides an oxidant, and during the circulation of the solution, the mixed solution of the original liquid and the catalyst is fully mixed with the oxidant to achieve the treatment of the original liquid. Since the ferrous ions are mixed with the original liquid in the baffle area, a large amount of hydroxyl radicals can be avoided when the oxidant is input into the circulation tank, and the hydroxyl radical annihilation can be avoided, thereby improving the utilization rate of the catalyst and the oxidant and reducing the drug consumption. At the same time, the ferrous ions are fully hydrolyzed, and the excessive decomposition of hydrogen peroxide due to insufficient hydrolysis can also be avoided to produce foam and scum, so there is no need to set up equipment such as scrapers and sprayers, thereby reducing equipment costs.

[0015] In addition, the reduction component can reduce the iron ions in the circulation pool to ferrous ions and transport the ferrous ions back to the circulation pool, so as to maintain the ferrous ion concentration in the circulation pool during the water treatment process, reduce the concentration of iron ions, improve the effect of catalytic oxidation, improve the utilization rate of hydrogen peroxide, and further reduce the input of catalysts to reduce drug consumption. Moreover, the reduction in the supply of catalysts can also reduce the amount of iron sludge in the later stage, which is convenient for later treatment. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The accompanying drawings are used to provide further understanding of the present application and constitute a part of the specification. They are used to explain the present application together with the embodiments of the present application and do not constitute a limitation of the present application.

[0017] Figure 1 A schematic diagram of the structure of a wastewater treatment system provided in one embodiment of the present application.

[0018] Description of labels: 11. Baffle tank; 12. First drug distribution pipe; 13. Circulation tank; 14. Second drug distribution pipe; 15. Reduction component; 16. Baffle plate; 17. Baffle drive; 18. First overflow port; 19. Guide tube; 20. Circulation drive; 21. Second overflow port; 22. Liquid inlet pipe; 23. Reduction tower; 231. Liquid inlet space; 232. Packing space; 233. Buffer space; 24. Liquid return pump; 25. Liquid return pipe; 26. Reduction drive; 27. Sprayer; 28. Filter; 29. ​​Check valve; 30. Booster pump; 31. Circulation pipe; 32. First regulating valve; 33. Second regulating valve; 34. Liquid discharge pipe; 35. Third regulating valve; 36. Fourth regulating valve; 37. Flow meter. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0020] 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 indicating orientations or positional relationships are 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.

[0021] The present application provides a wastewater treatment system, which treats wastewater through Fenton reaction; at the same time, the wastewater treatment system can reduce the mutual reaction of ·OH, thereby improving the utilization rate of catalyst and hydrogen peroxide and reducing drug consumption.

[0022] like Figure 1 As shown, the wastewater treatment system includes a baffle tank 11, a first drug distribution pipe 12, a circulation tank 13 and a second drug distribution pipe 14. The first drug distribution pipe 12 is arranged at the liquid inlet end of the baffle tank 11 for providing a catalyst. The stock solution is also transported to the liquid inlet end of the baffle tank 11. During the flow in the baffle tank 11, the catalyst and the stock solution are preliminarily mixed, and then the mixed solution is transported to the circulation tank 13.

[0023] The second drug dispensing pipe 14 is arranged in the circulation pool 13 and is spaced apart from the liquid outlet end of the baffle pool 11. The second drug dispensing pipe 14 is used to provide an oxidant, and the solution in the circulation pool 13 can circulate. It should be noted that the catalyst is a solution containing ferrous ions, and the oxidant is hydrogen peroxide. The catalyst is first preliminarily mixed with the stock solution in the baffle pool 11 to fully hydrolyze the ferrous ions, and then mixed with the oxidant in the circulation pool 13 to avoid the rapid and large-scale generation of ·OH, thereby avoiding the problem of hydroxyl extinction.

[0024] At the same time, the wastewater treatment system also includes a reduction component 15, which is connected to the circulation pool 13 and is used to obtain the solution in the circulation pool 13 and perform reduction treatment to reduce the iron ions (Fe 3+ ) is reduced to ferrous ions, and the reduction component 15 can also transport the reduced solution back to the circulation pool 13. In this way, the iron ions in the circulation pool 13 can be reduced to ferrous ions during the water treatment process, and the ferrous ions can be transported back to the circulation pool 13 to ensure that the concentration of ferrous ions meets the requirements and reduce the concentration of iron ions, thereby further improving the effect of catalytic oxidation and improving the utilization rate of hydrogen peroxide.

[0025] With the above-mentioned wastewater treatment system, the original wastewater solution is input into the liquid inlet end of the baffle tank 11, and then flows into the circulation tank 13 through the liquid outlet end of the baffle tank 11. The first drug distribution pipe 12 inputs the catalyst into the original solution, and the original solution and the catalyst are mixed during the flow of the baffle tank 11, and the ferrous ions are fully hydrolyzed; in the circulation tank 13, the second drug distribution pipe 14 provides an oxidant, and during the circulation of the solution, the mixed solution of the original solution and the catalyst is fully mixed with the oxidant to achieve the treatment of the original solution. Since the ferrous ions are mixed with the original solution in the baffle area, a large amount of hydroxyl radicals can be avoided when the oxidant is input into the circulation tank 13, and the hydroxyl radical annihilation can be avoided, thereby improving the utilization rate of the catalyst and the oxidant and reducing the drug consumption. At the same time, the ferrous ions are fully hydrolyzed, and the excessive decomposition of hydrogen peroxide due to insufficient hydrolysis can also be avoided to produce foam and scum, so there is no need to set up equipment such as scrapers and sprayers, thereby reducing equipment costs.

[0026] In addition, the reduction component 15 can reduce the iron ions in the circulation pool 13 to ferrous ions, and transport the ferrous ions back to the circulation pool 13, so that the concentration of ferrous ions in the circulation pool 13 can be maintained during the water treatment process, the concentration of iron ions can be reduced, the effect of catalytic oxidation can be improved, the utilization rate of hydrogen peroxide can be improved, and the input of catalyst can be further reduced to reduce drug consumption. Moreover, the reduction in the supply of catalyst can also reduce the amount of iron mud in the later stage, which is convenient for later treatment.

[0027] It can be understood that the first drug distribution tube 12 and the second drug distribution tube 14 can realize the gradual delivery of the catalyst and the oxidant. For example, multiple drug outlets can be opened on the first drug distribution tube 12 and the second drug distribution tube 14 to ensure that the catalyst and the oxidant are evenly delivered, and there will be no situation where the catalyst and the oxidant are stored in large quantities at the same time, resulting in the rapid generation and destruction of hydroxyl radicals.

[0028] In addition, the reduction component 15 transports ferrous ions to the circulation pool 13 , which does not cause an excessively high concentration of ferrous ions. Instead, it maintains the ferrous ion concentration in the circulation pool 13 at an appropriate concentration and reduces the concentration of iron ions in the circulation pool 13 .

[0029] In one embodiment, the baffle 11 is provided with a baffle plate 16 to form a baffle channel, the liquid inlet end of the baffle channel is located at the bottom of the baffle 11, and the liquid outlet end is located at the top of the baffle 11. At the same time, the liquid inlet end of the baffle 11 is also located at its own bottom, and the liquid outlet end is located at its own top, and the first drug dispensing tube 12 and the opening for the raw liquid input are both opened at the bottom of the baffle 11.

[0030] Furthermore, the wastewater treatment system further includes a baffle driving member 17, which is disposed at the bottom of the baffle area and is used to guide the solution at the bottom of the baffle pool 11 through the baffle channel and transported to the top of the baffle area, and then flows into the circulation pool 13. In practical applications, the liquid outlet end of the baffle pool 11, i.e. Figure 1 A first overflow port 18 is provided at the top of the middle baffle pool 11, and the first overflow port 18 is connected to the top of the circulation pool 13, and the second drug distribution pipe 14 is arranged at the bottom of the circulation pool 13. In this way, the second drug distribution pipe 14 can evenly transport the oxidant, and this arrangement can further prevent the oxidant from directly contacting the mixed solution that has just entered the circulation pool 13, and avoid the annihilation of hydroxyl radicals during the water treatment process.

[0031] In one embodiment, the wastewater treatment system also includes a guide tube 19 and a circulation drive 20. The guide tube 19 is arranged in the circulation pool 13 to form a circulation flow channel in the circulation pool 13; the circulation drive 20 is arranged in the guide tube 19 to guide the solution to circulate in the circulation flow channel.

[0032] like Figure 1 As shown, there are spacings between the top, bottom and side of the guide tube 19 and the inner wall of the circulation pool 13, so as to form a circulation channel in the circulation pool 13. It can be understood that the interior of the guide tube 19 itself also constitutes a part of the circulation channel. At the same time, in other embodiments, the formation of the circulation channel can also be achieved in other ways, such as providing a partition in the circulation pool 13 to form a circulation channel connected end to end, which is not limited here.

[0033] Preferably, the circulation drive member 20 can guide the solution in the guide tube 19 to flow toward the bottom of the circulation pool 13, and is simultaneously arranged at the bottom of the circulation pool 13 in combination with the second drug distribution tube 14. In this way, a certain impact will be generated during the flow of the solution toward the second drug distribution tube 14, so that the oxidant output by the second drug distribution tube 14 is diffused by the impact and circulates with the solution, thereby improving the uniformity of the oxidant distribution, thereby further avoiding the rapid generation of a large number of hydroxyl radicals.

[0034] In one embodiment, a second overflow port 21 is provided on one side of the circulation pool 13 away from the baffle pool 11. The liquid inlet end of the reduction component 15 is connected to the second overflow port 21, and the liquid outlet end of the reduction component 15 is connected to the top of the circulation pool 13. In this way, the liquid inlet end and the liquid outlet end of the reduction component 15 are spaced apart from each other, ensuring that the ferrous ions transported back by the reduction component 15 are evenly mixed with the solution in the circulation pool 13, and are transported to the reduction component 15 after the catalytic action is completed, so as to avoid being directly transported to the liquid inlet end of the reduction component 15, thereby improving the utilization rate of the ferrous ions in the reduction component 15.

[0035] In one embodiment, the reduction component 15 includes a liquid inlet pipe 22, a reduction tower 23, a liquid return pump 24 and a liquid return pipe 25. One end of the liquid inlet pipe 22 is connected to the circulation pool 13, and the other end is connected to the reduction tower 23, so that the solution in the circulation pool 13 flows into the reduction tower 23; the reduction tower 23 is used to perform reduction treatment on the solution to reduce the iron ions in the solution to ferrous ions; one end of the liquid return pump 24 is connected to the reduction tower 23, and the other end is connected to the liquid return pipe 25. The end of the liquid return pipe 25 away from the liquid return pump 24 is connected to the circulation pool 13, so that the liquid return pump 24 guides the solution in the reduction tower 23 that has been reduced and transported back to the circulation pool 13.

[0036] Preferably, the reduction tower 23 is provided with a liquid inlet space 231, a filler space 232 and a buffer space 233 arranged in sequence, one end of the liquid inlet pipe 22 is connected to the second overflow port 21, and the other end is connected to the liquid inlet space 231, so that the solution in the circulation pool 13 flows into the liquid inlet space 231; the filler space 232 is filled with electron-rich fillers, such as modified iron oxides, carbon materials, metal organic frameworks, etc., to reduce the solution passing through the filler space 232, and reduce the iron ions to ferrous ions; the reduced solution enters the buffer space 233, and the return liquid pump 24 is connected to the buffer space 233, so as to pump the reduced solution in the buffer space back to the circulation pool 13.

[0037] In order to enable the solution entering the reduction tower 23 to flow in sequence along the liquid inlet space 231, the packing space 232 and the buffer space 233, a reduction driving member 26 is also provided in the liquid inlet space 231. The reduction driving member 26 is used to guide the solution in the liquid inlet space 231 to flow toward the packing space 232, that is, to make the solution flow from the liquid inlet space 231 into the packing space 232 and the buffer space 233 in sequence.

[0038] It should be noted that, in this embodiment, the baffle drive 17, the circulation drive 20 and the reduction drive 26 all include a drive motor and a paddle, and the drive motor is used to drive the paddle to rotate, and the solution is guided to flow in a preset direction during the rotation of the paddle. For example, in the reduction tower 23, the liquid inlet space 231 is located at the bottom of the reduction tower 23, the buffer space 233 is located at the top of the reduction state, and the filler space 232 is located between the two. The rotation of the paddle in the reduction drive 26 can guide the solution to flow upward.

[0039] Furthermore, the reduction component 15 also includes a sprayer 27, which is arranged in the circulation pool 13 and connected to the end of the return pipe 25 away from the return pump 24, so as to evenly spray the reduced solution into the circulation pool 13, thereby ensuring the catalytic oxidation effect while avoiding the generation of a large amount of hydroxyl radicals in a short time.

[0040] In one embodiment, the reduction assembly 15 further includes a filter 28 and a check valve 29, which are sequentially arranged on the liquid inlet pipe 22 along the solution delivery direction to filter the solution flowing into the reduction tower 23 while avoiding solution reflux, remove foam and impurities, and prevent impurities from entering and blocking the filler in the filler space 232. Optionally, the filter 28 is a bag filter, and the filtration pore size is 0.1~1μm. Further, in order to ensure or increase the pressure of the solution delivered to the reduction tower 23, a booster pump 30 can be provided between the filter 28 and the circulation pool 13.

[0041] In one embodiment, the reduction assembly 15 further includes a circulation pipe 31, a first regulating valve 32 and a second regulating valve 33. One end of the circulation pipe 31 is connected to the end of the liquid return pump 24 away from the reduction tower 23, and the other end of the circulation pipe 31 is connected to the liquid inlet pipe 22, and the connection is located between the check valve 29 and the reduction tower 23. The first regulating valve 32 is arranged on the liquid return pipe 25, and the second regulating valve 33 is arranged on the circulation pipe 31 to adjust the flow of the liquid return pipe 25 and the circulation pipe 31 respectively.

[0042] It should be explained that the solution entering the liquid return pipe 25 will flow into the circulation pool 13, and the solution entering the circulation pipe 31 will return to the reduction tower 23 through the liquid inlet pipe 22 for circulation. By setting the circulation pipe 31, the solution can be split at the liquid return pipe 25 and the circulation pipe 31, that is, part of the solution is transported back to the circulation pool 13, and part of the solution is transported back to the reduction tower 23 for circulation, thereby improving the degree of reduction of the solution; at the same time, since the solution in the reduction tower 23 overflows into the second overflow port 21 of the circulation pool 13, the solution flow rate is limited. In order to avoid a large difference between the solution flow rate of the overflow into the reduction tower 23 and the solution flow rate transported back to the circulation pool 13, the circulation pipe 31 and the regulating valve are set to adjust the flow rate.

[0043] Furthermore, the reduction component 15 further includes a drain pipe 34, a third regulating valve 35 and a fourth regulating valve 36. The reduction tower 23 is provided with a liquid outlet, which is located at the top of the reduction tower 23 and is connected to the buffer space 233. The third regulating valve 35 and the drain pipe 34 are both connected to the liquid outlet. The drain pipe 34 is used to discharge the solution in the buffer space 233 to the next process, such as solid-liquid separation by alkali adjustment, that is, the drain pipe 34 serves as the outlet of the wastewater treatment system. The return pump 24 is connected to one end of the third regulating valve 35 away from the reduction tower 23, and the fourth regulating valve 36 is arranged on the drain pipe 34. In this way, the flow of the return pump 24 and the drain pipe 34 can be adjusted respectively by the third regulating valve 35 and the fourth regulating valve 36.

[0044] It should be explained that, for the wastewater treatment system, the raw liquid will continue to flow into the baffle tank 11. In order to maintain a stable amount of solution, the solution can be discharged through the drain pipe 34. At the same time, the flow rate of the reflux solution and the flow rate of the discharged solution are respectively controlled by the third regulating valve 35 and the fourth regulating valve 36, which can further ensure that the inflow and discharge amounts of the solution remain balanced.

[0045] Preferably, in order to facilitate the flow rate adjustment, the wastewater treatment system further includes a plurality of flow meters 37, and the return pipe 25, the circulation pipe 31 and the discharge pipe 34 are all provided with flow meters 37; of course, the flow meter 37 can also be provided between the return pump 24 and the third regulating valve 35, and this is not limited here. As an example, the ratio range of the flow rate of the discharge pipe 34, the flow rate of the return pipe 25 and the flow rate of the circulation pipe 31 is: 1: (1-2): (2-8).

[0046] As mentioned above, the structure of the wastewater treatment system provided by this application has been explained, and how these components work together to complete the wastewater treatment process is an important part of further interpreting the value of this application. Figure 1 The process flow of the wastewater treatment system in the above embodiment is described as follows: The stock solution enters the bottom of the baffle tank 11 and flows upward along the baffle channel under the action of the baffle drive 17. At the same time, the first drug distribution pipe 12 evenly inputs the catalyst into the bottom of the baffle tank 11, the catalyst and the stock solution are mixed in the baffle channel, the ferrous ions are fully hydrolyzed, and the mixed solution flows into the circulation tank 13 through the first overflow port 18.

[0047] After the mixed solution in the circulation pool 13 has submerged the guide tube 19, the circulation drive 20 is started to drive the solution in the circulation pool 13 to circulate; at the same time, the oxidant is evenly input into the circulation pool 13 through the second drug distribution pipe 14, and the circulation of the solution is coordinated, so that the oxidant generates evenly distributed hydroxyl radicals under the action of fully hydrolyzed ferrous ions, thereby achieving the degradation of organic matter.

[0048] During the degradation process, the solution containing iron ions enters the liquid inlet pipe 22 through the second overflow port 21, enters the liquid inlet space 231 after being pressurized and filtered, and enters the packing space 232 under the synergistic action of the reduction drive 26, fully contacts the packing in the packing space 232 for reduction treatment, and the reduced solution enters the buffer space 233. The solution in the buffer space 233 is divided, that is, discharged through the drain pipe 34, returned to the circulation pool 13 through the return pipe 25, and returned to the reduction tower 23 through the circulation pipe 31 for circulation.

[0049] In summary, the composition and process flow of the wastewater treatment system provided in the present application have been described, and Table 1 below can reflect the advantages of the wastewater treatment system provided in the present application compared with the traditional Fenton reaction device.

[0050] Table 1 It should be noted that the data in Table 1 are related data obtained by treating wastewater containing a certain type of carbonate ester generated by the battery production industry using a traditional Fenton reaction device (the traditional device in Table 1) and a wastewater treatment system provided by the present application (the present application in Table 1). The daily water treatment volume of both devices is 100L, and the COD (Chemical Oxygen Demand) of the stock solution is 3000mg / L.

[0051] As can be seen from the data in Table 1, the wastewater treatment system provided by the present application effectively reduces the consumption of hydrogen peroxide and ferrous ions. At the same time, for ferrous ions, since the reduction component 15 can reduce ferrous ions to ferrous ions for reuse, the addition amount of ferrous ions is further reduced (the first day is the commissioning operation), and the effluent COD is also due to the traditional device. In other words, the wastewater treatment system provided by the present application reduces the consumption of hydrogen peroxide and ferrous ions and reduces costs while the treatment effect is better than that of the traditional device. In addition, since the catalyst and oxidant in the present application are more evenly distributed, the rate of catalytic oxidation can be increased and the processing time can be shortened.

[0052] Although the embodiments of the present application 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 the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the appended claims and their equivalents.

Claims

1. A wastewater treatment system, characterized in that: include: baffles; A first drug dispensing pipe is arranged at the liquid inlet end of the baffle tank and is used to provide a catalyst; A circulation pool connected to the liquid outlet of the baffle pool, wherein the solution in the circulation pool can circulate; A second drug distributing pipe is arranged in the circulation pool and spaced apart from the liquid outlet end of the baffle pool, and the second drug distributing pipe is used to provide an oxidant; The reduction component is connected to the circulation pool and is used to obtain the solution in the circulation pool and perform reduction treatment, and then transport the reduced solution back to the circulation pool.

2. The wastewater treatment system according to claim 1, characterized in that: The wastewater treatment system further comprises a guide tube and a circulation drive member, wherein the guide tube is arranged in the circulation pool to form a circulation channel in the circulation pool; the circulation drive member is arranged in the guide tube to guide the solution to circulate in the circulation channel; A first overflow port is provided at the liquid outlet end of the baffle tank, the first overflow port is communicated with the top of the circulation channel, and the second drug dispensing pipe is arranged at the bottom of the circulation channel.

3. The wastewater treatment system according to claim 2, characterized in that: The circulation driving member can guide the solution in the guide tube to flow toward the bottom of the circulation pool.

4. The wastewater treatment system according to claim 2, characterized in that: A second overflow port is provided on a side of the circulation pool away from the baffle pool; The liquid inlet end of the reduction component is communicated with the second overflow port, and the liquid outlet end of the reduction component is connected to the top of the circulation pool.

5. The wastewater treatment system according to claim 1, characterized in that: The reduction component includes a liquid inlet pipe, a reduction tower, a liquid return pump and a liquid return pipe. One end of the liquid inlet pipe is connected to the circulation pool, and the other end is connected to the reduction tower, so that the liquid in the circulation pool enters the reduction tower. The reduction tower is used to perform reduction treatment on the solution. One end of the liquid return pump is connected to the reduction tower, and the other end is connected to the liquid return pipe. The end of the liquid return pipe away from the liquid return pump is connected to the circulation pool. The liquid return pump can guide the solution that has been reduced to be transported back to the circulation pool.

6. The wastewater treatment system according to claim 5, characterized in that: The reduction component also includes a circulation pipe, a first regulating valve and a second regulating valve. One end of the circulation pipe is connected to an end of the liquid return pump away from the reduction tower, and the other end of the circulation pipe is connected to the liquid inlet pipe. The first regulating valve is arranged on the liquid return pipe, and the second regulating valve is arranged on the circulation pipe to respectively adjust the flow rates of the liquid return pipe and the circulation pipe.

7. The wastewater treatment system according to claim 6, characterized in that: The reduction component includes a discharge pipe, a third regulating valve and a fourth regulating valve. The reduction tower is provided with a liquid outlet. The third regulating valve and the discharge pipe are both connected to the liquid outlet. The liquid return pump is connected to an end of the third regulating valve away from the reduction tower. The fourth regulating valve is arranged on the discharge pipe. The third regulating valve is used to adjust the flow rate of the liquid return pump. The fourth regulating valve is used to adjust the flow rate of the discharge pipe.

8. The wastewater treatment system according to claim 5, characterized in that: The reduction component further comprises a filter and a check valve, and the filter and the check valve are sequentially arranged on the liquid inlet pipe along the solution conveying direction.

9. The wastewater treatment system according to claim 5, characterized in that: The reduction component further comprises a sprayer, which is arranged in the circulation pool and connected to an end of the liquid return pipe away from the liquid return pump.

10. The wastewater treatment system according to claim 5, characterized in that: The reduction tower is provided with a liquid inlet space, a filler space and a buffer space arranged in sequence, the liquid inlet pipe is connected to the liquid inlet space, the liquid return pump is connected to the buffer space, and the filler space is filled with electron-rich fillers; The liquid inlet space is also provided with a reduction driving member, and the reduction driving member is used to guide the solution in the liquid inlet space to flow toward the filler space.

Images