Advanced treatment device for pesticide wastewater

Abstract

The utility model discloses a pesticide wastewater advanced treatment device which comprises a first-stage oxidation tower, a second-stage main reaction tower and a third-stage delay reaction tower which are sequentially arranged, a water outlet of the first-stage oxidation tower is communicated with a water inlet of the second-stage main reaction tower, and a water outlet of the second-stage main reaction tower is communicated with a water inlet of the third-stage delay reaction tower; the primary oxidation tower comprises a first tower body, a water inlet pipe, a first hydrogen peroxide adding pipe and an ozone jet device, the water inlet pipe is communicated with the first tower body, the first hydrogen peroxide adding pipe is communicated with the water inlet pipe, and the ozone jet device is mounted on the first tower body to introduce ozone into the first tower body; the secondary main reaction tower comprises a second tower body, a sodium persulfate dosing pipe and an ozone aeration disc; the sodium persulfate dosing pipe is communicated with a water inlet of the second tower body; the ozone aeration disc is arranged at the bottom in the second tower body; the third-stage delay reaction tower comprises a third tower body and a second hydrogen peroxide adding pipe, and the second hydrogen peroxide adding pipe is communicated with a water inlet of the third tower body.

Description

Technical Field

[0001] This application relates to the field of wastewater treatment technology, and in particular to a device for deep treatment of pesticide wastewater. Background Technology

[0002] With the improvement of agricultural modernization in my country, the use of pesticides in agricultural production has also increased, driving the development of the pesticide industry. Wastewater is generated during pesticide production, including synthesis, intermediate production, and equipment cleaning. This wastewater contains unreacted raw materials, intermediate products, byproducts, and solvents (such as benzene compounds, sulfides, and chlorides). During pesticide use, pesticide residues after application flow into water bodies with rainwater or irrigation water. Wastewater is also generated during the cleaning of pesticide packaging containers and the disposal of expired or banned pesticides.

[0003] Pesticide wastewater, a type of difficult-to-treat, highly concentrated, toxic organic wastewater, is characterized by its complex composition, unstable water quality and quantity, and the presence of organic matter including pesticide components such as organophosphorus, organochlorine, and carbamates, which have acute or chronic toxicity to organisms. COD (Chemical Oxygen Demand) and BOD (Biochemical Oxygen Demand) can reach thousands to tens of thousands of mg / L. The wastewater contains persistent organic compounds such as halogenated hydrocarbons and heterocyclic compounds, which are difficult to treat using traditional biological methods. The production process often involves the use of acids, alkalis, or salts, resulting in high salt content in the wastewater (such as sodium chloride and sodium sulfate).

[0004] Currently, methods for treating pesticide wastewater mainly include ozone oxidation, the Fenton method, and electrocatalytic oxidation. However, these methods mostly suffer from high treatment costs, poor operational stability, difficulty in completely mineralizing pesticide molecules, and low oxidant utilization rates, failing to meet water quality requirements for the degradation of organic matter. Pesticide wastewater treatment is a key and challenging area in environmental protection, requiring a combined approach of technological upgrades, policy regulation, and industry transformation. Currently, a suitable process is urgently needed to address this issue. Utility Model Content

[0005] This invention provides a device for deep treatment of pesticide wastewater, which solves the technical problems of high cost, poor stability and low oxidant utilization rate in the existing pesticide wastewater treatment technology.

[0006] To achieve the above objectives, the technical solution provided by this utility model is as follows:

[0007] In a first aspect, this utility model provides a device for deep treatment of pesticide wastewater, comprising a primary oxidation tower, a secondary main reaction tower, and a tertiary delayed reaction tower arranged sequentially. The outlet of the primary oxidation tower is connected to the inlet of the secondary main reaction tower, and the outlet of the secondary main reaction tower is connected to the inlet of the tertiary delayed reaction tower. The primary oxidation tower includes a first tower body, an inlet pipe, a first hydrogen peroxide dosing pipe, and an ozone jet injector. The inlet pipe is connected to the first tower body, the first hydrogen peroxide dosing pipe is connected to the inlet pipe, and the ozone jet injector is installed on the first tower body to introduce ozone into the first tower body. The secondary main reaction tower includes a second tower body, a sodium persulfate dosing pipe, and an ozone aeration disc. The sodium persulfate dosing pipe is connected to the inlet of the second tower body, and the ozone aeration disc is disposed at the bottom of the second tower body. The tertiary delayed reaction tower includes a third tower body and a second hydrogen peroxide dosing pipe, the second hydrogen peroxide dosing pipe being connected to the inlet of the third tower body.

[0008] Furthermore, the secondary main reaction tower also includes a titanium-based catalytic grid, which is vertically installed inside the second tower body to support the catalyst.

[0009] Furthermore, the diameter of the bubbles aerated by the ozone aeration disc is 10μm to 30μm, and the gas-liquid ratio of ozone to wastewater is 1:5.

[0010] Furthermore, the three-stage delayed reaction tower also includes a hydrogen peroxide slow-release grid, which is installed at the bottom of the third tower body to allow hydrogen peroxide to be slowly released into the wastewater.

[0011] Furthermore, the mesh diameter of the hydrogen peroxide slow-release mesh is 10mm to 30mm.

[0012] Furthermore, the pesticide wastewater deep treatment device also includes a circulation unit. The first tower, the second tower, and the third tower are all equipped with the circulation unit to test the pH value of the wastewater in real time and add acid to the wastewater.

[0013] Furthermore, the circulation unit includes an overflow pipe, a circulation pump, a first reflux pipe, a second reflux pipe, a pH meter, and an acid dosing pipe. The overflow ports of the first tower body, the second tower body, and the third tower body are each connected to an overflow pipe. One end of the circulation pump is connected to the overflow pipe, and the other end is connected to the first reflux pipe and the second reflux pipe, respectively. The first tower body, the second tower body, and the third tower body are each connected to the end of a first reflux pipe, and the first tower body, the second tower body, and the third tower body are each connected to the end of a second reflux pipe. The pH meter and the acid dosing pipe are sequentially installed on both the first reflux pipe and the second reflux pipe, and both the first reflux pipe and the second reflux pipe are connected to an acid dosing pipe.

[0014] Furthermore, the pesticide wastewater deep treatment device also includes a COD detector, which is installed at the inlet of the first tower, the second tower, and the third tower to monitor the chemical oxygen demand of the wastewater.

[0015] Furthermore, the pesticide wastewater deep treatment device also includes an ORP detector, which is installed at the top of the first tower, the second tower, and the third tower to monitor the oxidation-reduction potential of the wastewater.

[0016] Furthermore, the three-stage delayed reaction tower also includes multiple baffles, which are installed sequentially at an angle within the third tower body.

[0017] This invention provides a deep treatment device for pesticide wastewater, comprising a primary oxidation tower, a secondary main reaction tower, and a tertiary delayed reaction tower arranged sequentially. Through a synergistic chain reaction of hydrogen peroxide, sodium persulfate, and ozone, under acidic conditions, hydrogen peroxide and sodium persulfate are jointly activated by ozone, forming a complete multi-stage catalytic oxidation deep treatment device. The aforementioned deep treatment device employs a three-stage reaction coupling optimization. Hydrogen peroxide and sodium persulfate form a free radical network under ozone activation, covering different oxidation potentials and reaction rates, achieving the stepwise degradation of pesticide molecules. In the primary oxidation tower, OH· attacks the C=C and CN bonds (ester bonds of pyrethroids) in pesticide molecules and also causes preliminary breakage of the benzene ring; SO4 is generated in the secondary main reaction tower. - • Oxidizes S / P-containing groups (P=S bonds in organophosphorus pesticides); the three-stage delayed reaction tower degrades residual organic matter with hydrogen peroxide, improving the utilization rate of the oxidant. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the structure of the pesticide wastewater deep treatment device in this embodiment of the present invention.

[0020] Figure label:

[0021] 10. Primary oxidation tower; 11. First tower body; 12. Inlet pipe; 13. First hydrogen peroxide dosing pipe; 14. Ozone jet injector;

[0022] 20. Secondary main reaction tower; 21. Second tower body; 22. Sodium persulfate dosing pipe; 23. Ozone aeration disc; 24. Titanium-based catalytic grid;

[0023] 30. Three-stage delayed reaction tower; 31. Third tower body; 32. Second hydrogen peroxide dosing pipe; 33. Hydrogen peroxide slow-release grid; 34. Baffle plate;

[0024] 41. Overflow pipe; 42. Circulation pump; 43. First return pipe; 44. Second return pipe; 45. pH meter; 46. Acid dosing pipe;

[0025] 50. COD detector; 60. ORP detector. Detailed Implementation

[0026] To enable those skilled in the art to better understand the technical solutions in this application, the technical solutions in the embodiments of this application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0027] It should be noted that when a component is referred to as being "fixed to" or "set on" another component, it can be directly on or indirectly set on the other component; when a component is referred to as being "connected to" another component, it can be directly connected to or indirectly connected to the other component.

[0028] It should be understood that the terms "length", "width", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.

[0029] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of this application, "a plurality of" or "several" means two or more, unless otherwise explicitly specified.

[0030] It should be noted that the structures, proportions, sizes, etc., shown in the accompanying drawings of this specification are only for the purpose of assisting those skilled in the art in understanding and reading the content disclosed in the specification, and are not intended to limit the conditions under which this application can be implemented. Therefore, they have no substantial technical significance. Any modifications to the structure, changes in the proportions, or adjustments to the size should still fall within the scope of the technical content disclosed in this application, provided that they do not affect the effects and purposes that this application can produce.

[0031] like Figure 1 As shown in the figure, this application provides a pesticide wastewater deep treatment device, including a primary oxidation tower 10, a secondary main reaction tower 20, and a tertiary delayed reaction tower 30 arranged sequentially. The outlet of the primary oxidation tower 10 is connected to the inlet of the secondary main reaction tower 20, and the outlet of the secondary main reaction tower 20 is connected to the inlet of the tertiary delayed reaction tower 30. The primary oxidation tower 10 includes a first tower body 11, an inlet pipe 12, a first hydrogen peroxide dosing pipe 13, and an ozone jet injector 14. The inlet pipe 12 is connected to the first tower body 11, the first hydrogen peroxide dosing pipe 13 is connected to the inlet pipe 12, and the ozone jet injector 14 is installed on the first tower body 11 to introduce ozone into the first tower body 11. The secondary main reaction tower 20 includes a second tower body 21, a sodium persulfate dosing pipe 22, and an ozone aeration disc 23. The sodium persulfate dosing pipe 22 is connected to the inlet of the second tower body 21. The ozone aeration disc 23 is located at the bottom of the second tower body 21. The tertiary extended reaction tower 30 includes a third tower body 31 and a second hydrogen peroxide dosing pipe 32. The second hydrogen peroxide dosing pipe 32 is connected to the inlet of the third tower body 31.

[0032] In this embodiment, the first tower body 11, the second tower body 21, and the third tower body 31 are connected in sequence. The first hydrogen peroxide dosing pipe 13 is connected to the inlet pipe 12, allowing hydrogen peroxide and wastewater to mix and enter the first tower body 11. The wastewater contains acid, making it acidic. An ozone injector 14 is installed on the tower wall of the first tower body 11 to facilitate the injection of ozone into the first tower body 11. In the primary oxidation tower 10, ozone and hydrogen peroxide combine; under acidic conditions, ozone reacts with hydrogen peroxide to generate superoxide radicals (·O2). - It further transforms into OH·, achieving the oxidative degradation of organic matter. It can also rapidly generate OH·, attacking the C=C and CN bonds (ester bonds of pyrethroids) in pesticide molecules, and causing the benzene ring to break initially.

[0033] In this embodiment, the sodium persulfate dosing pipe 22 is connected to the second tower 21, allowing sodium persulfate to mix with the wastewater treated by the first tower 11 before entering the second tower 21. An ozone aeration disc 23 is also installed inside the second tower 21 to aerate ozone. The secondary main reaction tower 20 primarily uses ozone to directly oxidize sodium persulfate to SO4. - Ozone is further converted into OH· and SO4. -• It has a longer half-life, oxidizes S / P-containing groups (P=S bonds in organophosphorus pesticides), and can penetrate into the interior of pollutants.

[0034] In this embodiment, the second hydrogen peroxide dosing pipe 32 is connected to the inlet of the third tower 31, and hydrogen peroxide is introduced into the wastewater treated by the secondary main reaction tower 20 in the third tower 31. The hydrogen peroxide degrades the residual organic matter and improves the utilization rate of the oxidant.

[0035] The pesticide wastewater deep treatment device provided in this application includes a primary oxidation tower 10, a secondary main reaction tower 20, and a tertiary delayed reaction tower 30 arranged sequentially. Through a synergistic chain reaction of hydrogen peroxide, sodium persulfate, and ozone, under acidic conditions, hydrogen peroxide and sodium persulfate are jointly activated by ozone, forming a complete multi-stage catalytic oxidation deep treatment device. The ozone ejector 14 can be a Venturi ejector.

[0036] The aforementioned advanced treatment device employs a three-stage reaction coupling optimization. Hydrogen peroxide and sodium persulfate form a free radical network under ozone activation, covering different oxidation potentials and reaction rates to achieve the stepwise degradation of pesticide molecules. In the first-stage oxidation tower 10, OH· attacks the C=C and CN bonds (ester bonds of pyrethroids) in pesticide molecules and also causes the benzene ring to break initially. SO4 is generated in the second-stage main reaction tower 20. - • Oxidizes S / P-containing groups (P=S bonds in organophosphorus pesticides); the three-stage delayed reaction tower 30 degrades residual organic matter with hydrogen peroxide, improving the utilization rate of the oxidant.

[0037] In some embodiments, the secondary main reaction tower 20 further includes a titanium-based catalytic grid 24, which is vertically installed inside the second tower body 21 to support the catalyst. In this embodiment, the second tower body 21 is provided with a titanium-based catalytic grid 24, on which a Fe2O3-MnO2 bimetallic oxide is supported as a catalyst with a particle size of 50 nm to 100 nm. The above-mentioned bimetallic oxide catalyst supported on the titanium-based catalytic grid 24 can increase the contact area between the catalyst and the wastewater, promoting the ozone oxidation of sodium persulfate reaction in the second tower body 21.

[0038] In some embodiments, the diameter of the bubbles aerated by the ozone aeration disc 23 is 10μm to 30μm, and the gas-liquid ratio of ozone to wastewater is 1:5. In this embodiment, ozone is aerated into the second tower 21 through the ozone aeration disc 23, and the mass transfer efficiency of ozone reaches over 85%. The ozone aeration disc 23 is a micro / nano bubble generator.

[0039] In some embodiments, the three-stage delayed reaction tower 30 further includes a hydrogen peroxide slow-release grid 33, which is installed at the bottom of the third tower body 31 to allow hydrogen peroxide to be slowly released into the wastewater. In this embodiment, the hydrogen peroxide slow-release grid 33 is a stainless steel mesh coated with polyvinyl alcohol. The slow-release grid, placed at the bottom of the third tower body 31, slows the rate at which hydrogen peroxide is released into the wastewater, thereby ensuring more thorough oxidation of organic matter. Specifically, the mesh diameter of the hydrogen peroxide slow-release grid 33 is 10mm to 30mm.

[0040] In some embodiments, the pesticide wastewater deep treatment device further includes a circulation unit. The first tower 11, second tower 21, and third tower 31 are all equipped with circulation units to monitor the pH value of the wastewater in real time and add acid to the wastewater. In this embodiment, circulation units are installed outside the first tower 11, second tower 21, and third tower 31 to monitor the pH value of the wastewater in real time. Then, based on the set and measured pH values ​​of the wastewater, acid is added to the towers to maintain pH stability within the towers, thereby ensuring the continuous reaction within the wastewater.

[0041] Furthermore, the circulation unit includes an overflow pipe 41, a circulation pump 42, a first reflux pipe 43, a second reflux pipe 44, a pH meter 45, and an acid dosing pipe 46. The overflow ports of the first tower body 11, the second tower body 21, and the third tower body 31 are respectively connected to an overflow pipe 41. One end of the circulation pump 42 is connected to the overflow pipe 41, and the other end is respectively connected to the first reflux pipe 43 and the second reflux pipe 44. The first tower body 11, the second tower body 21, and the third tower body 31 are respectively connected to the end of a first reflux pipe 43, and the first tower body 11, the second tower body 21, and the third tower body 31 are respectively connected to the end of a second reflux pipe 44. A pH meter 45 and an acid dosing pipe 46 are sequentially installed on the first reflux pipe 43 and the second reflux pipe 44, and both the first reflux pipe 43 and the second reflux pipe 44 are connected to an acid dosing pipe 46.

[0042] In this embodiment, the circulation unit is equipped with an overflow pipe 41 and two return pipes. The overflow pipe 41 is located at the top of the tower. The two return pipes are connected to the tower at a position lower than the connection position of the overflow pipe 41 to the tower, but higher than the inlet. The connection positions of the two return pipes to the tower are also different. The two return pipes are spaced apart on the tower. By setting two return pipes and installing a pH meter 45 and an acid dosing pipe 46 on each return pipe, acid can be dynamically added to the tower according to the real-time changes in the acidity of the wastewater, and the added acid can be quickly mixed to different positions in the tower, thereby quickly achieving uniform and stable pH value within the tower and maintaining the acidity within the tower within a set range. The pH value range within the tower is 3 to 5.

[0043] In some embodiments, the pesticide wastewater deep treatment device also includes a COD detector 50. COD detectors 50 are installed at the inlets of the first tower 11, the second tower 21, and the third tower 31 to monitor the chemical oxygen demand of the wastewater. In this embodiment, the COD detector 50 is installed at the inlet of the tower and can detect the COD of the influent online in real time. It can also adjust the dosage of hydrogen peroxide or sodium persulfate according to a set algorithm to achieve precise control of the oxidant.

[0044] In some embodiments, the pesticide wastewater deep treatment device also includes an ORP detector 60. ORP detectors 60 are installed at the top of the first tower 11, the second tower 21, and the third tower 31 to monitor the oxidation-reduction potential of the wastewater. In this embodiment, the ORP detector 60 is located at the top of the tower and can detect the oxidation-reduction potential of the wastewater inside the tower in real time online, and adjust the dosage of hydrogen peroxide or sodium persulfate according to a set algorithm.

[0045] In some embodiments, the three-stage delayed reaction tower 30 further includes multiple baffles 34, which are sequentially installed at an angle within the third tower body 31. In this embodiment, multiple baffles 34 are installed within the third tower body 31 at an angle to the inner wall of the third tower body 31, which can extend the flow path of the wastewater, delay the reaction, and improve the utilization rate of the oxidant. The multiple baffles 34 are located above the hydrogen peroxide slow-release grid 33.

[0046] In the pesticide wastewater deep treatment device of this application embodiment, the raw wastewater enters the primary oxidation tower 10, and acid is added by the circulation unit to maintain the acidic environment inside the tower. Hydrogen peroxide enters the first tower body 11 through the first hydrogen peroxide dosing pipe 13, and mixes thoroughly with ozone through the ozone ejector 14. Under acidic conditions, the ozone reacts with the hydrogen peroxide to generate superoxide radicals (·O2). - The oxidative degradation of organic matter is achieved by rapidly generating OH·, which is suitable for ring-opening reactions (such as the initial cleavage of benzene rings). It has specific mechanisms of action for different organic compounds, thus achieving the removal and detoxification of pollutants in water. This process is a continuously effective promoting reaction and does not produce inorganic sludge.

[0047] After being treated by the primary oxidation tower 10, the wastewater enters the secondary main reaction tower 20. Inside the second tower body 21, the Fe2O3-MnO2 bimetallic oxide catalyst supported on the titanium-based catalytic grid 24 and the bubbles aerated by the ozone aeration disc 23 directly oxidize sodium persulfate to produce SO4. - ·, SO4 - • It oxidizes sulfur / phosphorus-containing groups and has a longer half-life, allowing it to penetrate into the interior of pollutants.

[0048] After being treated by the secondary main reaction tower 20, the wastewater enters the tertiary extended reaction tower 30. The flow path is extended by the baffle 34 set in the third tower body 31, and the bottom is equipped with a hydrogen peroxide slow-release grid 33 to extend the reaction time, improve the utilization rate of oxidant, and ensure complete mineralization.

[0049] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A device for deep treatment of pesticide wastewater, characterized in that: It includes a primary oxidation tower, a secondary main reaction tower, and a tertiary delayed reaction tower arranged in sequence. The outlet of the primary oxidation tower is connected to the inlet of the secondary main reaction tower, and the outlet of the secondary main reaction tower is connected to the inlet of the tertiary delayed reaction tower. The primary oxidation tower includes a first tower body, an inlet pipe, a first hydrogen peroxide dosing pipe, and an ozone jet injector. The inlet pipe is connected to the first tower body, the first hydrogen peroxide dosing pipe is connected to the inlet pipe, and the ozone jet injector is installed on the first tower body to introduce ozone into the first tower body. The secondary main reaction tower includes a second tower body, a sodium persulfate dosing pipe, and an ozone aeration disc. The sodium persulfate dosing pipe is connected to the water inlet of the second tower body. The ozone aeration disc is located at the bottom of the second tower body. The three-stage delayed reaction tower includes a third tower body and a second hydrogen peroxide dosing pipe, the second hydrogen peroxide dosing pipe being connected to the water inlet of the third tower body.

2. The pesticide wastewater deep treatment device according to claim 1, characterized in that, The secondary main reaction tower also includes a titanium-based catalytic grid, which is vertically installed inside the second tower body to support the catalyst.

3. The pesticide wastewater deep treatment device according to claim 1, characterized in that, The ozone aeration disc produces bubbles with a diameter of 10μm to 30μm, and the gas-liquid ratio of ozone to wastewater is 1:

5.

4. The pesticide wastewater deep treatment device according to claim 1, characterized in that, The three-stage delayed reaction tower also includes a hydrogen peroxide slow-release grid, which is installed at the bottom of the third tower body to allow hydrogen peroxide to be slowly released into the wastewater.

5. The pesticide wastewater deep treatment device according to claim 4, characterized in that, The mesh diameter of the hydrogen peroxide slow-release mesh is 10mm to 30mm.

6. The pesticide wastewater deep treatment device according to any one of claims 1 to 5, characterized in that, The pesticide wastewater deep treatment device also includes a circulation unit. The first tower, the second tower, and the third tower are all equipped with the circulation unit to test the pH value of the wastewater in real time and add acid to the wastewater.

7. The pesticide wastewater deep treatment device according to claim 6, characterized in that, The circulation unit includes an overflow pipe, a circulation pump, a first reflux pipe, a second reflux pipe, a pH meter, and an acid dosing pipe. The overflow ports of the first tower body, the second tower body, and the third tower body are each connected to an overflow pipe. One end of the circulation pump is connected to the overflow pipe, and the other end is connected to the first reflux pipe and the second reflux pipe, respectively. The first tower body, the second tower body, and the third tower body are each connected to the end of a first reflux pipe, and the first tower body, the second tower body, and the third tower body are each connected to the end of a second reflux pipe. The pH meter and the acid dosing pipe are sequentially installed on both the first reflux pipe and the second reflux pipe, and both the first reflux pipe and the second reflux pipe are connected to an acid dosing pipe.

8. The pesticide wastewater deep treatment device according to any one of claims 1 to 5, characterized in that, The pesticide wastewater deep treatment device also includes a COD detector. The COD detector is installed at the inlet of the first tower, the second tower, and the third tower to monitor the chemical oxygen demand of the wastewater.

9. The pesticide wastewater deep treatment device according to any one of claims 1 to 5, characterized in that, The pesticide wastewater deep treatment device also includes an ORP detector. The ORP detector is installed at the top of the first tower, the second tower, and the third tower to monitor the oxidation-reduction potential of the wastewater.

10. The pesticide wastewater deep treatment device according to any one of claims 1 to 5, characterized in that, The three-stage delayed reaction tower also includes multiple baffles, which are installed sequentially at an angle inside the third tower body.

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