Monitoring and treatment system for high-concentration ammonia-phenol wastewater

Abstract

The utility model discloses a high-concentration ammonia phenol wastewater monitoring and treatment system, and relates to the technical field of wastewater treatment. The high-concentration ammonia-phenol wastewater monitoring treatment system comprises a water inlet unit, a first treatment unit for performing Fenton reaction, a second treatment unit for performing oxidation reaction, a third treatment unit for performing oxidation reaction, a drainage unit and a control unit which are sequentially arranged and connected, the first processing unit, the second processing unit and the third processing unit are all provided with sensors and / or monitors connected with the control unit. By adopting the high-concentration ammonia-phenol wastewater monitoring and treatment system provided by the utility model, high-efficiency treatment of high-concentration ammonia-nitrogen wastewater can be realized, the dosage of chemicals and the like in the treatment process can be adjusted in real time, and stable effluent performance is ensured.

Description

Technical Field

[0001] The utility model relates to the technical field of wastewater treatment, and particularly relates to a monitoring and treatment system for high-concentration phenolic and ammonia wastewater. Background Art

[0002] Coking wastewater generated in the coking processes of coal chemical industry, petrochemical industry, etc. is rich in phenolic substances, tar, ammonia nitrogen and other substances, and has the characteristics of complex composition, high and fluctuating COD, high toxicity, and difficult degradation. The total phenolic content of high-concentration phenolic and ammonia wastewater is 800 mg / L to 3000 mg / L, the ammonia nitrogen content is 200 mg / L to 900 mg / L, and the COD content is 5000 mg / L to 20000 mg / L. Conventional electrocatalytic wastewater treatment devices can treat low-concentration phenolic and ammonia wastewater, but it is difficult for high-concentration phenolic and ammonia wastewater to meet the discharge standards after treatment, which causes great harm to the environment. Moreover, the reaction in the process of treating high-concentration phenolic and ammonia wastewater is complex, and problems such as incomplete reaction, reaction failure, and unstable effluent performance are likely to occur. Content of the Utility Model

[0003] The technical problem to be solved by the utility model is to provide a monitoring and treatment system for high-concentration phenolic and ammonia wastewater, which can realize the efficient treatment of high-concentration ammonia nitrogen wastewater, and can adjust the dosage of chemicals in the treatment process in real time to ensure stable effluent performance.

[0004] To solve the above technical problem, the utility model provides a monitoring and treatment system for high-concentration phenolic and ammonia wastewater, which includes an inlet unit, a first treatment unit for Fenton reaction, a second treatment unit for oxidation reaction, a third treatment unit for oxidation reaction, a drainage unit and a control unit, which are arranged and connected in sequence;

[0005] The first treatment unit includes a first Fenton reaction tank and a second Fenton reaction tank. Among them, a first H2O2 concentration sensor, an Fe 2+ concentration sensor, a Cu + concentration sensor and a first pH monitor connected to the control unit are arranged in the first Fenton reaction tank; a second H2O2 concentration sensor, a second pH monitor and a first ORP monitor connected to the control unit are arranged in the second Fenton reaction tank;

[0006] The second treatment unit includes a first electrocatalytic cell and a second electrocatalytic cell. A first conductivity meter and a second ORP monitor connected to the control unit are arranged in the first electrocatalytic cell; a second conductivity meter, a third ORP monitor and a TOC analyzer connected to the control unit are arranged in the second electrocatalytic cell;

[0007] The third processing unit includes a photocatalytic cell, and a dissolved oxygen concentration sensor and a light intensity monitor connected to the control unit are provided in the photocatalytic cell;

[0008] First COD monitors, second COD monitors, and third COD monitors connected to the control unit are respectively provided at the water outlet ends of the second Fenton reaction tank, the second electrocatalytic cell, and the photocatalytic cell.

[0009] As an improvement of the above solution, a fourth COD monitor, an ammonia nitrogen concentration sensor, a phenol concentration sensor, and a suspended solid concentration sensor connected to the control unit are provided in the drainage unit, and are respectively used for real-time detection of the COD concentration, ammonia nitrogen concentration, phenol concentration, and suspended solid concentration in the drainage unit.

[0010] As an improvement of the above solution, the first Fenton reaction tank is provided with a first chemical liquid dosing device, and the first chemical liquid dosing device includes an acid liquid dosing device, a ferrous dosing device, a cuprous dosing device, and a hydrogen peroxide dosing device; the first chemical liquid dosing device is provided with a liquid storage tank, a chemical agent dosing pump, an inlet valve, and an inlet pipeline; the liquid storage tank is connected to the first Fenton reaction tank through the inlet pipeline, and the chemical agent dosing pump and the inlet valve are arranged on the inlet pipeline.

[0011] As an improvement of the above solution, the first H2O2 concentration sensor is arranged on one side of the first Fenton reaction tank close to the water outlet, and is used for real-time detection of the H2O2 concentration in the first Fenton reaction tank;

[0012] The Fe 2+ concentration sensor is arranged on one side of the first Fenton reaction tank far from the hydrogen peroxide dosing device, and is used for real-time detection of the Fe 2+ concentration in the first Fenton reaction tank;

[0013] The Cu + concentration sensor is arranged on one side of the first Fenton reaction tank far from the hydrogen peroxide dosing device, and is used for real-time detection of the Cu + concentration in the first Fenton reaction tank;

[0014] The first pH monitor is arranged in the middle of the first Fenton reaction tank, and is used for real-time detection of the pH in the first Fenton reaction tank;

[0015] The control unit is respectively connected to the chemical agent dosing pump and the inlet valve of the first chemical liquid dosing device.

[0016] As an improvement of the above solution, the second Fenton reaction tank is provided with a catalyst loading device and a second liquid medicine dosing device. The second liquid medicine dosing device includes an acid liquid dosing device and a hydrogen peroxide dosing device; the catalyst loading system is arranged inside the second Fenton reaction tank; the second liquid medicine dosing device is respectively provided with a liquid storage tank, a medicine dosing pump, a liquid inlet valve and a liquid inlet pipeline; the liquid storage tank is connected with the second Fenton reaction tank through the liquid inlet pipeline, and the medicine dosing pump and the liquid inlet valve are arranged on the liquid inlet pipeline.

[0017] As an improvement of the above solution, the second H2O2 concentration sensor is arranged on one side of the second Fenton reaction tank close to the water outlet, and is used for real-time detection of the H2O2 concentration in the second Fenton reaction tank;

[0018] The second pH monitor is arranged in the middle of the second Fenton reaction tank, and is used for real-time detection of the pH in the second Fenton reaction tank;

[0019] The first ORP monitor is arranged on one side of the catalyst loading device, and is used for real-time detection of the oxidation-reduction potential in the second Fenton reaction tank;

[0020] The first COD monitor is used for real-time detection of the COD content in the second Fenton reaction tank;

[0021] The control unit is respectively connected with the medicine dosing pump and the liquid inlet valve of the second liquid medicine dosing device.

[0022] As an improvement of the above solution, first intercepting membranes are arranged at both the water inlet and the water outlet of the second Fenton reaction tank;

[0023] The second Fenton reaction tank is further provided with a circulation pipeline, and second intercepting membranes are arranged at both the water inlet and the water outlet of the circulation pipeline;

[0024] The pore diameters of the first intercepting membrane and the second intercepting membrane are both smaller than the particle diameter of the catalyst loaded by the catalyst loading device.

[0025] As an improvement of the above solution, both the first electrocatalytic cell and the second electrocatalytic cell are provided with a power supply and a plurality of electrode groups arranged at intervals;

[0026] The first conductivity meter is arranged in the middle of the first electrocatalytic cell and the second electrocatalytic cell, and is used for real-time detection of the conductivity in the first electrocatalytic cell and the second electrocatalytic cell;

[0027] The second ORP monitor is arranged in the middle of the first electrocatalytic cell and the second electrocatalytic cell, and is used for real-time detection of the oxidation-reduction potential in the first electrocatalytic cell and the second electrocatalytic cell;

[0028] The TOC analyzer is disposed on one side of the second electrocatalytic cell near the water outlet for real-time detection of the total organic carbon content in the second electrocatalytic cell;

[0029] The second COD monitor is used for real-time detection of the COD content in the second electrocatalytic cell;

[0030] The control unit is respectively connected to the power supplies of the first electrocatalytic cell and the second electrocatalytic cell.

[0031] As an improvement to the above solution, the photocatalytic cell is provided with a light source and an aeration device. The light source is encapsulated in the photocatalytic cell, and the aeration device is disposed at the bottom of the photocatalytic cell;

[0032] A dissolved oxygen concentration sensor and a light intensity monitor are disposed in the photocatalytic cell, and a third COD monitor is disposed at the water outlet end of the photocatalytic cell;

[0033] The dissolved oxygen concentration sensor is disposed on one side of the photocatalytic cell near the aeration device for real-time detection of the dissolved oxygen concentration in the photocatalytic cell;

[0034] The light intensity monitor is disposed on one side of the photocatalytic cell near the light source for real-time detection of the light intensity of the light source;

[0035] The third COD monitor is used for real-time detection of the COD content in the photocatalytic cell;

[0036] The control unit is connected to the light source of the photocatalytic cell.

[0037] As an improvement to the above solution, the high-concentration para-aminophenol wastewater monitoring and treatment system further includes a wireless communication unit. The wireless communication unit is connected to the control unit for communicating with an external communication device;

[0038] A water inlet pump, a flow meter and a water inlet valve are disposed on the pipeline between the water inlet unit and the first Fenton reaction tank; the water inlet pump, the flow meter and the water inlet valve are respectively connected to the control unit.

[0039] Implementing the present utility model has the following beneficial effects:

[0040] 1. The high-concentration ammonia and phenol wastewater monitoring and treatment system provided by the present utility model includes a first treatment unit for Fenton reaction, a second treatment unit for oxidation reaction, and a third treatment unit for oxidation reaction. The first treatment unit includes a first Fenton reaction tank and a second Fenton reaction tank. The second treatment unit includes a first electrocatalytic cell and a second electrocatalytic cell. The third treatment unit includes a photocatalytic cell. Each treatment unit operates independently and cooperates with each other to improve the treatment effect of high-concentration ammonia nitrogen wastewater, efficiently degrade pollutants such as COD, ammonia nitrogen, and phenols, reduce chemical consumption, energy consumption, and sludge volume, and enhance the reaction economy.

[0041] 2. Sensors and / or monitors for data collection are provided in the first treatment unit, the second treatment unit, and the third treatment unit provided by the present utility model. They can collect the parameters required during the wastewater treatment process and adjust the reactions in the treatment units in real time according to the collected data. It has high control precision, fast reaction, simple operation, and stable effluent performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] Figure 1 is a schematic structural diagram of the high-concentration ammonia and phenol wastewater monitoring and treatment system provided by the present utility model;

[0043] Figure 2 is a schematic structural diagram of the first Fenton reaction tank provided by the present utility model;

[0044] Figure 3 is a schematic structural diagram of the second Fenton reaction tank provided by the present utility model;

[0045] Figure 4 is a schematic structural diagram of the first electrocatalytic cell provided by the present utility model;

[0046] Figure 5 is a schematic structural diagram of the second electrocatalytic cell provided by the present utility model;

[0047] Figure 6 is a schematic structural diagram of the photocatalytic cell provided by the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0048] To make the objectives, technical solutions, and advantages of the present utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings. It should be noted that the orientation terms such as up, down, left, right, front, back, inside, and outside that appear or will appear in the present utility model are only based on the drawings of the present utility model, and they do not specifically limit the present utility model.

[0049] Such as Figure 1As shown in the figure, an embodiment of the present utility model provides a high-concentration ammonia and phenol wastewater monitoring and treatment system, which includes an inlet unit 1, a first treatment unit 2 for Fenton reaction, a second treatment unit 3 for oxidation reaction, a third treatment unit 4 for oxidation reaction, a drainage unit 5, and a control unit 6 that are arranged and connected in sequence;

[0050] The first treatment unit 2 includes a first Fenton reaction tank 21 and a second Fenton reaction tank 22. Among them, a first H2O2 concentration sensor 211, an Fe 2+ concentration sensor 212, a Cu + concentration sensor 213, and a first pH monitor 214 are provided in the first Fenton reaction tank 21; a second H2O2 concentration sensor 221, a second pH monitor 222, and a first ORP monitor 223 are provided in the second Fenton reaction tank 22 and are connected to the control unit 6;

[0051] The second treatment unit 3 includes a first electrocatalytic cell 31 and a second electrocatalytic cell 32. Among them, a first conductivity meter 311 and a second ORP monitor 312 are provided in the first electrocatalytic cell 31 and are connected to the control unit 6; a second conductivity meter 321, a third ORP monitor 322, and a TOC analyzer 323 are provided in the second electrocatalytic cell 32 and are connected to the control unit 6;

[0052] The third treatment unit 4 includes a photocatalytic cell 41. A dissolved oxygen concentration sensor 411 and a light intensity monitor 412 are provided in the photocatalytic cell 41 and are connected to the control unit 6;

[0053] First COD monitors 224, second COD monitors 324, and third COD monitors 413 connected to the control unit 6 are respectively provided at the water outlet ends of the second Fenton reaction tank 22, the second electrocatalytic cell 32, and the photocatalytic cell 41.

[0054] The high-concentration ammonia and phenol wastewater monitoring and treatment system provided by the present utility model includes a first treatment unit 2 for Fenton reaction, a second treatment unit 3 for oxidation reaction, and a third treatment unit 4 for oxidation reaction. Each treatment unit operates independently and cooperates with each other to improve the treatment effect of high-concentration ammonia nitrogen wastewater, efficiently degrade pollutants such as COD, ammonia nitrogen, and phenols, reduce drug consumption, energy consumption, and sludge volume, and enhance the reaction economy; sensors and / or monitors for data collection are provided in each treatment unit to collect data such as reagent concentration, wastewater composition, and reaction process during the wastewater treatment process. A controller connected to the sensors and / or monitors adjusts and controls corresponding devices such as pumps and valves according to the collected data to achieve stable and automated treatment of high-concentration ammonia and phenol wastewater.

[0055] It is understandable that the control unit 6 can be a conventional controller in the art, such as a PLC controller, a DCS controller, etc. The sensors and / or monitors input the collected data into the control unit 6 through a signal converter, and the control unit 6 adjusts and controls the actions of the corresponding devices.

[0056] In one embodiment, the high-concentration para-aminophenol wastewater monitoring and treatment system further includes a wireless communication unit 7. The wireless communication unit 7 is connected to the control unit 6 and is used for communicating with an external communication device. It is understandable that the wireless communication unit 7 can be a 4G wireless communication unit or a 5G wireless communication unit, and the external communication device can be a mobile phone and / or a tablet computer, but is not limited thereto. The control unit 6 acquires various information measured by the sensors and / or monitors during the wastewater treatment process, and sends it to the external communication device through the wireless communication module 7. The staff can view the real-time data of the wastewater monitoring and treatment system through the external communication device, and send control instructions to the control unit 6 through the wireless communication module 7, realizing remote control and supervision of the wastewater treatment, improving the operation management efficiency of the high-concentration para-aminophenol wastewater monitoring and treatment system, and ensuring the safe and stable operation of the high-concentration para-aminophenol wastewater monitoring and treatment system.

[0057] In one embodiment, as Figure 2 shown, the first Fenton reaction tank 21 is provided with a first chemical liquid dosing device. The first chemical liquid dosing device includes a first acid liquid dosing device 215, an iron dosing device 216, a copper dosing device 217, and a first hydrogen peroxide dosing device 218; each first chemical liquid dosing device is provided with a liquid storage tank, a chemical agent dosing pump, a liquid inlet valve, and a liquid inlet pipeline; the liquid storage tank is connected to the first Fenton reaction tank 21 through the liquid inlet pipeline, and the chemical agent dosing pump and the liquid inlet valve are arranged on the liquid inlet pipeline.

[0058] A Fenton reaction is carried out in the first Fenton reaction tank 21 to rapidly degrade macromolecular pollutants such as para-aminophenol. A sufficient amount of H2O2 and Fe 2+ need to be added to the first Fenton reaction tank 21 to quickly cut off the benzene ring structure and convert para-aminophenol into small molecule acids such as oxalic acid and acetic acid.

[0059] Specifically, the sensors and / or monitors in the first Fenton reaction tank 21 are arranged as follows:

[0060] The first H2O2 concentration sensor 211 is arranged on one side of the first Fenton reaction tank 21 close to the water outlet, and is used for real-time detection of the H2O2 concentration in the first Fenton reaction tank 21. Real-time detection of the H2O2 concentration in the first Fenton reaction tank 21 can avoid excessive or insufficient H2O2 in the first Fenton reaction tank 21. Excessive H2O2 may inhibit the Fenton reaction, and insufficient H2O2 will lead to incomplete degradation.

[0061] Fe 2+The concentration sensor 212 is arranged on one side of the first Fenton reaction tank 21 away from the first hydrogen peroxide dosing device 218 for real-time detection of the Fe 2+ concentration in the first Fenton reaction tank 21. By real-time detecting the Fe 2+ concentration in the first Fenton reaction tank 21, it is possible to avoid the excess or deficiency of Fe 2+ in the first Fenton reaction tank 21. Excess Fe 2+ may inhibit the Fenton reaction and increase the production of iron sludge (Fe(OH)3) at the same time. Insufficient Fe 2+ will lead to the stagnation of the reaction and the accumulation of H2O2.

[0062] Cu + The concentration sensor 213 is arranged on one side of the first Fenton reaction tank 21 away from the first hydrogen peroxide dosing device 218 for real-time detection of the Cu + concentration in the first Fenton reaction tank 21. By real-time detecting the Cu + concentration in the first Fenton reaction tank 21, the Cu + concentration and the Fe 2+ concentration are controlled at an appropriate ratio to optimize the •OH free radical yield.

[0063] The first pH monitor 214 is arranged in the middle of the first Fenton reaction tank 21 for real-time detection of the pH in the first Fenton reaction tank 21. By real-time detecting the pH in the first Fenton reaction tank 21, it is possible to avoid the pH in the first Fenton reaction tank 21 being too high or too low. When the pH is too high, Cu + and / or Fe 2+ will hydrolyze and precipitate, and when the pH is too low, the reaction will be inhibited.

[0064] The control unit 6 is respectively connected to the chemical dosing pump and the inlet valve of the first chemical dosing device. The control unit 6 adjusts the chemical dosing pumps and inlet valves of the first hydrogen peroxide dosing device 218, the ferrous dosing device 216, the cuprous dosing device 217 and the first acid dosing device 215 according to the data collected by the first H2O2 concentration sensor 211, the Fe 2+ concentration sensor 212, the Cu + concentration sensor 213 and the first pH monitor 214, so as to realize the precise monitoring and adjustment of the chemical dosing in the first Fenton reaction tank 21.

[0065] In one embodiment, as Figure 3As shown in the figure, the second Fenton reaction tank 22 is provided with a catalyst loading device 225 and a second liquid medicine adding device. The second liquid medicine adding device includes a second acid liquid adding device 226 and a second hydrogen peroxide adding device 227. The catalyst loading device 225 is arranged inside the second Fenton reaction tank 22. The second liquid medicine adding devices are all provided with a liquid storage tank, a medicine adding pump, an inlet valve and an inlet pipeline. The liquid storage tank is connected to the second Fenton reaction tank 22 through the inlet pipeline, and the medicine adding pump and the inlet valve are arranged on the inlet pipeline.

[0066] In the second Fenton reaction tank 22, heterogeneous Fenton reaction is carried out. Fe(Ⅲ), iron-containing minerals and some other transition metals such as Co, Cd, Cu, Ag, Mn, Ni, etc. are used to accelerate or replace Fe(Ⅱ) to catalyze H2O2. The heterogeneous Fenton reaction significantly enhances the oxidation and degradation ability of organic matters, and at the same time avoids the increase of COD in the treated wastewater caused by excessive use of Fe and the generation of secondary pollution. The •OH free radicals generated during the reaction process have strong oxidizing properties and can oxidize and decompose the organic matters in the water.

[0067] For the wastewater with high total phenol content and ammonia nitrogen content, the high-concentration phenol and ammonia wastewater monitoring and treatment system provided by the present utility model significantly improves the degradation effect of phenol and ammonia through the combined use of the first Fenton reaction tank 21 and the second Fenton reaction tank 22. In the first Fenton reaction tank 21, the Fenton reaction quickly destroys the benzene ring structure in the wastewater. In the second Fenton reaction tank 22, the heterogeneous Fenton reaction degrades the remaining macromolecular organic matters, which can significantly reduce the dosage of medicines while improving the degradation effect of phenol and ammonia.

[0068] Specifically, the sensors and / or monitors in the second Fenton reaction tank 22 are arranged as follows:

[0069] The second H2O2 concentration sensor 221 is arranged on one side of the second Fenton reaction tank 22 close to the water outlet, and is used for real-time detection of the H2O2 concentration in the second Fenton reaction tank 22. By real-time detecting the H2O2 concentration in the second Fenton reaction tank 22, it is avoided that the H2O2 in the second Fenton reaction tank 22 is excessive or insufficient. Excessive H2O2 will cause waste of medicines and may inhibit the catalyst activity at the same time, while insufficient H2O2 will lead to incomplete degradation.

[0070] The second pH monitor 222 is arranged in the middle of the second Fenton reaction tank 22, and is used for real-time detection of the pH in the second Fenton reaction tank 22. By real-time detecting the pH in the second Fenton reaction tank 22, it is avoided that the pH in the first Fenton reaction tank 21 is too high or too low. When the pH is too high, the dissolution of Fe on the catalyst surface decreases, and the catalyst activity drops. When the pH is too low, the reaction will be inhibited. 2+ The dissolution of Fe on the catalyst surface decreases, and the catalyst activity drops. When the pH is too low, the reaction will be inhibited.

[0071] The first ORP monitor 223 is provided on one side of the catalyst loading device 225 and is used to detect the redox potential in the second Fenton reaction tank 22 in real time. By detecting the redox potential in the second Fenton reaction tank 22 in real time, if the redox potential is too low, it indicates insufficient H2O2 or deactivated catalyst. When the ORP tends to be stable, it means that the pollutants are basically degraded.

[0072] The first COD monitor 224 is used to detect the COD content in the second Fenton reaction tank 22 in real time. When the COD content in the second Fenton reaction tank 22 reaches the preset standard, subsequent treatment is carried out.

[0073] The control unit 6 is respectively connected to the chemical dosing pump and the inlet valve of the second chemical dosing device. The control unit 6 adjusts the chemical dosing pump and the inlet valve of the second hydrogen peroxide dosing device 227 and the second acid dosing device 226 according to the data collected by the second H2O2 concentration sensor 221, the second pH monitor 222, and the first ORP monitor 223, so as to realize precise monitoring and adjustment of the chemical dosing in the second Fenton reaction tank 22.

[0074] In a preferred embodiment, first intercepting membranes are provided at both the inlet and outlet of the second Fenton reaction tank 22;

[0075] The second Fenton reaction tank 22 is also provided with a circulation pipeline 228, and second intercepting membranes are provided at both the inlet and outlet of the circulation pipeline 228;

[0076] The pore sizes of the first intercepting membrane and the second intercepting membrane are both smaller than the particle size of the catalyst loaded by the catalyst loading device 225. The setting of the first intercepting membrane and the second intercepting membrane can ensure that the catalyst will not be lost from the intercepting membrane during the external circulation of the wastewater.

[0077] In one embodiment, such as Figure 4 and Figure 5As shown in the figure, the first electrocatalytic cell 31 is provided with a power supply 313 and a plurality of electrode groups arranged at intervals. Each electrode group includes an anode plate 314 and a cathode plate 315. The positive pole of the power supply 313 is connected to the anode plate 314, and the negative pole of the power supply 313 is connected to the cathode plate 315. It can be understood that the arrangement of the second electrocatalytic cell 32 is basically the same as that of the first electrocatalytic cell 31. The second electrocatalytic cell 32 is provided with a power supply 325 and a plurality of electrode groups arranged at intervals. Each electrode group includes an anode plate 326 and a cathode plate 327. The positive pole of the power supply 325 is connected to the anode plate 326, and the negative pole of the power supply 325 is connected to the cathode plate 327. The first electrocatalytic cell 31 and the second electrocatalytic cell 32 mineralize small molecule acids. Both the first electrocatalytic cell 31 and the second electrocatalytic cell 32 are provided with a plurality of electrode plates, and the surface distance between the cathode and the anode becomes smaller, thereby increasing the surface current density in the electrocatalytic cell, ensuring the efficiency of decomposing wastewater in large quantities and for a long time. The equipment structure is simple and the operation is convenient. Under the action of the power supply, oxidation and reduction reactions occur on the anode and cathode of the wastewater respectively, converting it into non-toxic and non-polluting substances.

[0078] For the wastewater treated by the first treatment unit 2, the high-concentration para-aminophenol wastewater monitoring and treatment system provided by the present utility model significantly improves the COD removal rate through the combined use of the first electrocatalytic cell 31 and the second electrocatalytic cell 32. After the first treatment unit 2 treats the wastewater, stubborn organic substances such as oxalic acid and acetic acid remain in the wastewater, and substances with biological toxicity such as chlorophenol and nitrophenol may also be contained. In the first electrocatalytic cell 31, high current density is used for rapid oxidation to rapidly degrade residual organic substances and substances with biological toxicity. In the second electrocatalytic cell 32, low current density is used for refined treatment to deeply mineralize small molecule acids. The total energy consumption is reduced by 20% - 30% compared with single-stage treatment, and at the same time, the electrode life can be extended.

[0079] Specifically, the sensors and / or monitors in the first electrocatalytic cell 31 and the second electrocatalytic cell 32 are arranged as follows:

[0080] The first conductivity meter 311 is arranged in the middle of the first electrocatalytic cell 31, and the second conductivity meter 321 is arranged in the middle of the second electrocatalytic cell 32, for real-time detection of the conductivity in the first electrocatalytic cell 31 and the second electrocatalytic cell 32. By real-time detecting the conductivity in the first electrocatalytic cell 31 and the second electrocatalytic cell 32, if the conductivity is too low, a higher voltage is required, resulting in increased energy consumption, and if the conductivity is too high, side reactions will occur.

[0081] The second ORP monitor 312 is disposed in the middle of the first electrocatalytic cell 31, and the third ORP monitor 322 is disposed in the middle of the second electrocatalytic cell 32, for real-time detection of the oxidation-reduction potential in the first electrocatalytic cell 31 and the second electrocatalytic cell 32. The oxidation-reduction potential in the first electrocatalytic cell 31 and the second electrocatalytic cell 32 is detected in real time. If the oxidation-reduction potential is too low, the current needs to be adjusted to ensure the content of the oxidant.

[0082] The TOC analyzer 323 is disposed on one side of the second electrocatalytic cell 32 close to the water outlet, for real-time detection of the total organic carbon content in the second electrocatalytic cell 32. The total organic carbon content in the second electrocatalytic cell 32 is detected in real time. If the TOC removal rate is too low, the reaction time needs to be extended. When the TOC approaches the baseline, it indicates that the pollutants are thoroughly mineralized.

[0083] The second COD monitor 324 is used for real-time detection of the COD content in the second electrocatalytic cell 32. When the COD content in the second electrocatalytic cell 32 reaches the preset standard, subsequent treatment is carried out.

[0084] The control unit 6 is respectively connected to the power supplies of the first electrocatalytic cell 31 and the second electrocatalytic cell 32. The control unit 6 adjusts the power supplies of the first electrocatalytic cell 31 and / or the second electrocatalytic cell 32 according to the data collected by the first conductivity meter 311, the second ORP monitor 312, the second conductivity meter 321, the third ORP monitor 322, and the TOC analyzer 323, so as to realize the precise monitoring and adjustment of the anodic oxidation reaction in the first electrocatalytic cell 31 and the second electrocatalytic cell 32.

[0085] In one embodiment, as Figure 6 shown, the photocatalytic cell 41 is provided with a light source 414 and an aeration device 415. The light source 414 is encapsulated in the photocatalytic cell 41. The light source 414 can be an ultraviolet lamp. The aeration device 415 is disposed at the bottom of the photocatalytic cell 41. The photocatalytic cell 41 is used for thoroughly oxidizing the electrocatalyzed wastewater to remove residual organic matter so as to meet the discharge standard.

[0086] Specifically, the sensors and / or monitors in the photocatalytic cell 41 are arranged as follows:

[0087] The dissolved oxygen concentration sensor 411 is disposed on one side of the photocatalytic cell 41 close to the aeration device 415, for real-time detection of the dissolved oxygen concentration in the photocatalytic cell 41. The dissolved oxygen concentration in the photocatalytic cell 41 is detected in real time. A higher dissolved oxygen concentration can promote the generation of more superoxide radicals, thereby enhancing the photocatalytic degradation efficiency. An appropriate dissolved oxygen concentration also helps to prevent the passivation and inactivation of the photocatalyst and maintain the high efficiency of the photocatalytic reaction.

[0088] The light intensity monitor 412 is provided on one side of the photocatalytic cell 41 close to the light source 414 for real-time detection of the light intensity of the light source 414. The light intensity in the photocatalytic cell 41 is detected in real time. Excessive light intensity may cause excessive absorption and scattering of photons, reducing the utilization efficiency of light energy, while too low light intensity will result in incomplete photocatalytic reactions.

[0089] The third COD monitor 413 is used for real-time detection of the COD content in the photocatalytic cell 41. When the COD content in the photocatalytic cell 41 reaches the preset standard, subsequent treatment is carried out.

[0090] The control unit 6 is connected to the light source 414 of the photocatalytic cell 41. The control unit 6 adjusts the intensity and position of the light source 414 according to the data collected by the dissolved oxygen concentration sensor 411 and the light intensity monitor 412, realizing precise monitoring and adjustment of the photocatalytic reaction in the photocatalytic cell 41.

[0091] In one embodiment, a fourth COD monitor 511, an ammonia nitrogen concentration sensor 512, a phenol concentration sensor 513, and a suspended solid concentration sensor 514 connected to the control unit 6 are provided in the drainage unit 5. The fourth COD monitor 511, the ammonia nitrogen concentration sensor 512, the phenol concentration sensor 513, and the suspended solid concentration sensor 514 are all provided in the middle of the drainage unit 5, and are respectively used for real-time detection of the COD concentration, ammonia nitrogen concentration, phenol concentration, and suspended solid concentration in the drainage unit 5.

[0092] In addition, a feed water pump, a flow meter, and a feed water valve are provided on the pipeline between the water inlet unit 1 and the first Fenton reaction tank 21; the feed water pump, the flow meter, and the feed water valve are respectively connected to the control unit 6.

[0093] By using the high-concentration para-aminophenol wastewater monitoring and treatment system provided by the present utility model, efficient treatment of high-concentration para-aminophenol wastewater can be realized, and the dosage of chemicals during the treatment process can be adjusted in real time to ensure stable effluent performance. For the high-concentration para-aminophenol wastewater treated by the high-concentration para-aminophenol wastewater monitoring and treatment system provided by the present utility model, when discharged, the COD removal rate can reach more than 85%, the total phenol removal rate can reach more than 90%, and the ammonia nitrogen removal rate can reach more than 90%.

[0094] The above are the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the principle of the present utility model, several improvements and refinements can be made, and these improvements and refinements are also regarded as the protection scope of the present utility model.

Claims

1. A high-concentration ammonia and phenol wastewater monitoring and treatment system, characterized in that, It includes an inlet unit, a first treatment unit for performing Fenton reaction, a second treatment unit for performing oxidation reaction, a third treatment unit for performing oxidation reaction, a drainage unit and a control unit, which are arranged and connected in sequence; The first processing unit includes a first Fenton reaction tank and a second Fenton reaction tank. Among them, a first H2O2 concentration sensor, an Fe 2+ concentration sensor, a Cu + concentration sensor, and a first pH monitor are provided in the first Fenton reaction tank; a second H2O2 concentration sensor, a second pH monitor, and a first ORP monitor are provided in the second Fenton reaction tank and are connected to the control unit; The second treatment unit includes a first electrocatalytic cell and a second electrocatalytic cell. Among them, a first conductivity meter and a second ORP monitor connected to the control unit are arranged in the first electrocatalytic cell; a second conductivity meter, a third ORP monitor and a TOC analyzer connected to the control unit are arranged in the second electrocatalytic cell; The third treatment unit includes a photocatalytic cell, and a dissolved oxygen concentration sensor and a light intensity monitor connected to the control unit are arranged in the photocatalytic cell; First COD monitors, second COD monitors and third COD monitors connected to the control unit are respectively arranged at the water outlet ends of the second Fenton reaction tank, the second electrocatalytic cell and the photocatalytic cell.

2. The high-concentration ammonia and phenol wastewater monitoring and treatment system according to claim 1, wherein A fourth COD monitor, an ammonia nitrogen concentration sensor, a phenol concentration sensor and a suspended solid concentration sensor connected to the control unit are arranged in the drainage unit, which are respectively used for real-time detection of the COD concentration, ammonia nitrogen concentration, phenol concentration and suspended solid concentration in the drainage unit.

3. The high-concentration para-aminophenol wastewater monitoring and treatment system according to claim 1, wherein The first Fenton reaction tank is provided with a first chemical solution dosing device. The first chemical solution dosing device includes an acid solution dosing device, an iron(II) dosing device, a copper(I) dosing device and a hydrogen peroxide dosing device; each of the first chemical solution dosing devices is provided with a liquid storage tank, a chemical agent dosing pump, an inlet valve and an inlet pipeline; the liquid storage tank is connected to the first Fenton reaction tank through the inlet pipeline, and the chemical agent dosing pump and the inlet valve are arranged on the inlet pipeline.

4. The high-concentration ammonia and phenol wastewater monitoring and treatment system according to claim 3, characterized in that, The first H2O2 concentration sensor is arranged on one side of the first Fenton reaction tank close to the water outlet, and is used for real-time detection of the H2O2 concentration in the first Fenton reaction tank; The Fe 2+ concentration sensor is arranged on one side of the first Fenton reaction tank away from the hydrogen peroxide dosing device and is used to detect the Fe 2+ concentration in real time in the first Fenton reaction tank; The Cu + concentration sensor is disposed on a side of the first Fenton reaction tank away from the hydrogen peroxide dosing device for real-time detection of the Cu + concentration in the first Fenton reaction tank; The first pH monitor is arranged in the middle of the first Fenton reaction tank, and is used for real-time detection of the pH in the first Fenton reaction tank; The control unit is respectively connected to the chemical agent dosing pump and the inlet valve of the first chemical solution dosing device.

5. The high-concentration para-aminophenol wastewater monitoring and treatment system according to claim 1, characterized in that The second Fenton reaction tank is provided with a catalyst loading device and a second chemical solution dosing device. The second chemical solution dosing device includes an acid solution dosing device and a hydrogen peroxide dosing device; the catalyst loading device is arranged in the second Fenton reaction tank; each of the second chemical solution dosing devices is provided with a liquid storage tank, a chemical agent dosing pump, an inlet valve and an inlet pipeline; the liquid storage tank is connected to the second Fenton reaction tank through the inlet pipeline, and the chemical agent dosing pump and the inlet valve are arranged on the inlet pipeline.

6. The high-concentration para-aminophenol wastewater monitoring and treatment system according to claim 5, characterized in that, The second H2O2 concentration sensor is arranged on one side of the second Fenton reaction tank close to the water outlet, and is used for real-time detection of the H2O2 concentration in the second Fenton reaction tank; The second pH monitor is arranged in the middle of the first Fenton reaction tank, and is used for real-time detection of the pH in the second Fenton reaction tank; The first ORP monitor is arranged on one side of the catalyst loading device, and is used for real-time detection of the oxidation-reduction potential in the second Fenton reaction tank; The first COD monitor is used to detect the COD content in the second Fenton reaction tank in real time; The control unit is respectively connected to the chemical agent dosing pump and the inlet valve of the second chemical agent dosing device.

7. The high-concentration para-aminophenol wastewater monitoring and treatment system according to claim 5, characterized in that First intercepting membranes are provided at both the water inlet and the water outlet of the second Fenton reaction tank; The second Fenton reaction tank is further provided with a circulation pipeline, and second intercepting membranes are provided at both the water inlet and the water outlet of the circulation pipeline; The pore sizes of the first intercepting membrane and the second intercepting membrane are both smaller than the particle size of the catalyst loaded by the catalyst loading device.

8. The high-concentration para-aminophenol wastewater monitoring and treatment system according to claim 1, characterized in that, Both the first electrocatalytic cell and the second electrocatalytic cell are provided with a power supply and a plurality of electrode groups arranged at intervals; The first conductivity meter is arranged in the middle of the first electrocatalytic cell and the second electrocatalytic cell, and is used to detect the conductivity in the first electrocatalytic cell and the second electrocatalytic cell in real time; The second ORP monitor is arranged in the middle of the first electrocatalytic cell and the second electrocatalytic cell, and is used to detect the oxidation-reduction potential in the first electrocatalytic cell and the second electrocatalytic cell in real time; The TOC analyzer is arranged on one side of the second electrocatalytic cell close to the water outlet, and is used to detect the total organic carbon content in the second electrocatalytic cell in real time; The second COD monitor is used to detect the COD content in the second electrocatalytic cell in real time; The control unit is respectively connected to the power supplies of the first electrocatalytic cell and the second electrocatalytic cell.

9. The high-concentration para-aminophenol wastewater monitoring and treatment system according to claim 1, wherein, The photocatalytic cell is provided with a light source and an aeration device. The light source is encapsulated in the photocatalytic cell, and the aeration device is arranged at the bottom of the photocatalytic cell; A dissolved oxygen concentration sensor and a light intensity monitor are arranged in the photocatalytic cell, and a third COD monitor is arranged at the water outlet end of the photocatalytic cell; The dissolved oxygen concentration sensor is arranged on one side of the photocatalytic cell close to the aeration device, and is used to detect the dissolved oxygen concentration in the photocatalytic cell in real time; The light intensity monitor is arranged on one side of the photocatalytic cell close to the light source, and is used to detect the light intensity of the light source in real time; The third COD monitor is used to detect the COD content in the photocatalytic cell in real time; The control unit is connected to the light source of the photocatalytic cell.

10. The high-concentration para-aminophenol wastewater monitoring and treatment system according to claim 1, characterized in that, The high-concentration para-aminophenol wastewater monitoring and treatment system further includes a wireless communication unit. The wireless communication unit is connected to the control unit and is used for communicating with an external communication device; A water inlet pump, a flow meter and a water inlet valve are arranged on the pipeline between the water inlet unit and the first Fenton reaction tank; the water inlet pump, the flow meter and the water inlet valve are respectively connected to the control unit.

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