Laboratory azo dye wastewater treatment device

Abstract

The utility model discloses a laboratory azo dye wastewater treatment device which comprises a wastewater tank and a Fenton reactor, and the wastewater tank is connected with a sewage pump; the Fenton reactor comprises a box body and a top cover; an organic glass plate is arranged at the bottom of the box body; an inner cavity of the box body serves as a reaction cavity; the top cover is provided with a first motor and a feeding port, and the first motor is connected with a first stirring blade; the upper part of the box is connected with a hydrogen peroxide solution container through a hydrogen peroxide solution filling pipe; the lower part of the reaction cavity is connected with a water outlet pump; the water outlet pump is connected with the magnetic separator through a first two-position three-way electromagnetic valve and a second two-position three-way electromagnetic valve; an outlet of the magnetic separator is connected with a discharge pipe; the device is simple in structure, a normal pollution discharge process or a backwashing recovery process can be realized by switching the conduction directions of the first two-position three-way electromagnetic valve and the second two-position three-way electromagnetic valve, separated magnetic biomass charcoal can be conveniently backwashed back to the reaction cavity through the backwashing recovery process, and efficient recovery and reutilization of the magnetic biomass charcoal are realized.

Description

Technical Field

[0001] The utility model relates to the technical field of environmental monitoring, in particular to a technology for treating wastewater containing azo dyes. Background Art

[0002] Some wastewater generated during environmental monitoring contains azo dyes. For example, when spectrophotometrically determining nitrogen oxides in ambient air, nitrite, and aniline in water, the reaction is typically carried out under acidic conditions, using naphthylethylenediamine hydrochloride as a color developer to generate a pink azo dye.

[0003] Azo dyes are harmful to human health and the environment. According to environmental regulations, wastewater containing azo compounds must be treated before discharge.

[0004] The Fenton reaction is an advanced oxidation process primarily used in water treatment and pollutant degradation. It involves the generation of hydroxyl radicals from hydrogen peroxide (H2O2) catalyzed by iron ions. These radicals possess strong oxidative power and are highly effective in degrading organic pollutants. Among the many advanced oxidation reactions for azo dyes, the Fenton method is highly favored for its low cost and low toxicity.

[0005] The Fenton reaction has been widely used in the treatment of azo dye wastewater, but its practical application is limited due to the difficulty in catalyst recovery and unstable catalytic activity. It also produces sludge containing pharmaceuticals, which can easily cause secondary pollution.

[0006] Magnetic biochar is synthesized from biochar (such as straw, sawdust and other agricultural and forestry waste), ferrous sulfate and ferric chloride. Studies have found that the porous properties of magnetic biochar can quickly adsorb azo dyes, and the magnetic ferric tetroxide it contains is composed of divalent iron (Fe +2 ) and ferric iron (Fe +3 ) After adding hydrogen peroxide (H2O2), Fe +2 It can immediately catalyze H2O2 to produce free radicals OH·, which has strong oxidizing properties and can completely degrade azo dyes into carbon dioxide, water and inorganic ions; at the same time, Fe +2 Convert Fe +3 , Fe +3 Reacts with H2O2 to regenerate Fe +2 , the magnetic carbon is regenerated. The reaction formula is as follows: .

[0007] Azo dyes adsorbed on magnetic biochar can be degraded in the Fenton reaction in about 1 hour. The traditional homogeneous Fenton reaction with the addition of ferrous salts must adjust the pH value of the sewage to about 3 to proceed effectively. The heterogeneous Fenton reaction induced by magnetic biochar catalysis has a wide pH range, and the magnetic biochar can be recycled after in situ regeneration; however, the recovery process of magnetic biochar is relatively difficult.

[0008] The existing method for recovering magnetic biochar involves injecting water containing the magnetic biochar into a recovery container. A magnetic field is then applied to the outer wall of the container, causing the magnetic biochar particles to adhere to the inner wall. The water is then drained from the container, leaving the magnetic biochar adsorbed on the inner wall for recycling. This recovery method is complex and inefficient. It is suitable for small volumes (1 liter) of wastewater in laboratories. For larger volumes of wastewater, recovery becomes more complex and inefficient. Utility Model Content

[0009] The purpose of the utility model is to provide a device for treating laboratory environmental monitoring azo dye wastewater based on magnetic biomass carbon adsorption and catalytic Fenton reaction. The magnetic biomass carbon can be easily recycled and reused without generating sludge waste.

[0010] To achieve the above-mentioned purpose, the laboratory azo dye wastewater treatment device of the present invention comprises a wastewater tank and a Fenton reactor, wherein the bottom of the wastewater tank is connected to a sewage pump; the Fenton reactor comprises a box body, and a top cover is provided on the top of the box body;

[0011] An organic glass plate is provided at the bottom of the box, and the inner cavity of the box serves as a reaction chamber; the outlet of the sewage pump is connected to the bottom of the reaction chamber through a pipeline;

[0012] The top cover is provided with a first motor and a magnetic biochar feeding port, and the output shaft of the first motor extends downward into the reaction chamber and is connected to a first stirring blade;

[0013] The upper part of the box is connected to a hydrogen peroxide solution container through a hydrogen peroxide solution filling pipe, and a dosing metering pump is provided on the hydrogen peroxide solution filling pipe;

[0014] The lower part of the reaction chamber is connected to a water outlet pump, the outlet of the water outlet pump is connected to a first two-position three-way solenoid valve, the first two-position three-way solenoid valve has an outlet and two selective inlets; the two selective inlets of the first two-position three-way solenoid valve are respectively connected to the backflush interface of the magnetic separator and the water outlet pump; the outlet of the first two-position three-way solenoid valve is connected to a second two-position three-way solenoid valve;

[0015] The second two-position three-way solenoid valve has three interfaces, a first interface of the second two-position three-way solenoid valve is connected to the first two-position three-way solenoid valve, a second interface of the second two-position three-way solenoid valve is connected to the inlet of the magnetic separator, and a third interface of the second two-position three-way solenoid valve is connected to the reaction chamber; the second two-position three-way solenoid valve controls its first interface to selectively connect to its second interface or its third interface;

[0016] The outlet of the magnetic separator is connected to a discharge pipe; the discharge pipe is connected to a recoil bypass pipe, a recoil pump is connected in series to the recoil bypass pipe, a first recoil solenoid valve is provided on the discharge pipe between both ends of the recoil bypass pipe, the outlet direction of the recoil pump is toward the magnetic separator, and a second recoil solenoid valve is provided on the recoil bypass pipe at the outlet of the recoil pump;

[0017] The recoil pump, the first recoil solenoid valve, the second recoil solenoid valve, the sewage pump, the first motor, the dosing metering pump, the first two-position three-way solenoid valve and the second two-position three-way solenoid valve are all connected to an electronic control device connected to a display screen.

[0018] It also includes a pH control mechanism, which includes an acid tank for containing acidic solution, an alkaline tank for containing alkaline solution, and a four-position four-way solenoid valve;

[0019] The first inlet of the four-position four-way solenoid valve is connected to the acid tank upward, and the second inlet of the four-position four-way solenoid valve is connected to the alkali tank upward; the first outlet of the four-position four-way solenoid valve is connected to the reaction chamber through a pipeline;

[0020] The second outlet of the four-position four-way solenoid valve is connected to the drainage box through a pipeline; a first pH sensor is suspended downward from the top cover through a connecting line, and the first pH sensor extends downward below the liquid level of the reaction chamber; the first pH sensor and the four-position four-way solenoid valve are respectively connected to the electronic control device.

[0021] The discharge pipe connected to the outlet of the magnetic separator leads to the drainage box. A cover is provided at the open top of the drainage box. A second pH sensor is suspended from the cover via a connecting line. The second pH sensor is located in the middle of the drainage box. A sewage pipe is connected to the bottom of the drainage box, and a sewage solenoid valve is provided on the sewage pipe.

[0022] The second pH sensor and the sewage discharge electromagnetic valve are respectively connected to the electronic control device.

[0023] The magnetic separator comprises an upper shell and a lower shell which are communicated with each other. The outer cover of the lower shell is provided with an annular electromagnet which is connected with the electric control device. The recoil interface is communicated with the lower shell.

[0024] The utility model has the following advantages:

[0025] The utility model has a simple structure and can realize a normal sewage discharge process or a backwash recovery process by switching the conduction direction of the first two-position three-way solenoid valve and the second two-position three-way solenoid valve in conjunction with a backwash pump. The separated magnetic biochar can be conveniently backwashed back to the reaction chamber through the backwash recovery process, thereby realizing efficient recovery and reuse of the magnetic biochar.

[0026] According to the signal from the first pH sensor, by switching the working state (valve core position) of the four-position four-way solenoid valve, acidic solution or alkaline solution can be selectively added to the reaction chamber to adjust the pH value of the liquid in the reaction chamber to 3-3.5 (including both end values), thereby providing good acidic conditions for the Fenton reaction and improving the efficiency of the Fenton reaction.

[0027] According to the signal from the second pH sensor, by switching the working state (valve core position) of the four-position four-way solenoid valve, acidic solution or alkaline solution can be selectively added to the drain tank to adjust the pH value of the discharged liquid to about 7, thereby avoiding acidic and alkaline pollution to the environment.

[0028] The magnetic separator has a simple structure. When treated wastewater passes through the magnetic separator, the flow rate of the water in the upper shell of the magnetic separator slows down, and the annular electromagnet is energized, attracting the magnetic biochar in the magnetic separator and sinking it into the lower shell. After the water in the reaction chamber is drained, the outlet pump and various valves are closed, and the annular electromagnet is closed to stop adsorbing the magnetic biochar. The recoil pump and the second recoil solenoid valve are opened through the electronic control device, and the first recoil solenoid valve is closed. The states of the first, second, third, and second third solenoid valves are controlled so that the water outlet from the recoil pump passes through the recoil port of the magnetic separator, the first, second, third, and second third solenoid valves, and then enters the reaction chamber, realizing the recovery and reuse of the magnetic biochar. The entire recovery process does not require manual collection, making the recovery of magnetic biochar much more convenient and efficient than before. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 It is a structural diagram of the present utility model.

[0030] Figure 2 It is a schematic diagram of the electric control structure of the utility model. DETAILED DESCRIPTION

[0031] like Figure 1 and Figure 2 As shown, the laboratory azo dye wastewater treatment device of the present invention includes a wastewater tank 1 for containing wastewater to be treated and a Fenton reactor. The bottom of the wastewater tank 1 is connected to a sewage pump 2; the Fenton reactor includes a box body 3, and the top of the box body 3 is provided with a top cover 4;

[0032] An organic glass plate 5 is provided at the bottom of the box body 3, and the inner cavity of the box body 3 serves as a reaction chamber 7; the outlet of the sewage pump 2 is connected to the bottom of the reaction chamber 7 through a pipeline;

[0033] The top cover 4 is provided with a first motor 8 and a magnetic biochar feeding port 9. The output shaft of the first motor 8 extends downward into the reaction chamber 7 and is connected to a first stirring blade 10.

[0034] The upper portion of the box body 3 is connected to a hydrogen peroxide solution container 11 via a hydrogen peroxide solution filling pipe 35 , on which a dosing metering pump 12 is provided; the hydrogen peroxide solution container 11 is used to store hydrogen peroxide solution.

[0035] The lower part of the reaction chamber 7 is connected to a water outlet pump 13, the outlet of the water outlet pump 13 is connected to a first two-position three-way solenoid valve 14, and the first two-position three-way solenoid valve 14 has one outlet and two selective inlets; the two selective inlets of the first two-position three-way solenoid valve 14 are respectively connected to the backflush interface 15 of the magnetic separator and the water outlet pump 13; the outlet of the first two-position three-way solenoid valve 14 is connected to a second two-position three-way solenoid valve 16.

[0036] The second two-position, three-way solenoid valve 16 has three interfaces. The first interface of the second two-position, three-way solenoid valve 16 is connected to the first two-position, three-way solenoid valve 14. The second interface of the second two-position, three-way solenoid valve 16 is connected to the inlet of the magnetic separator. The third interface of the second two-position, three-way solenoid valve 16 is connected to the reaction chamber 7. The second two-position, three-way solenoid valve 16 controls its first interface to selectively connect to its second interface or third interface.

[0037] Water can flow from the second two-position three-way solenoid valve 16 to the magnetic separator (during normal drainage), and can also flow from the second two-position three-way solenoid valve 16 to the reaction chamber 7 (during backwashing).

[0038] The outlet of the magnetic separator is connected to a discharge pipe 17, which is connected to a recoil bypass pipe 42. A recoil pump 37 is connected in series to the recoil bypass pipe 42. A first recoil solenoid valve 38 is provided on the discharge pipe 17 between both ends of the recoil bypass pipe 42. The outlet direction of the recoil pump 37 faces the magnetic separator. A second recoil solenoid valve 39 is provided on the recoil bypass pipe 42 at the outlet of the recoil pump 37.

[0039] The backflush pump 37, the first backflush solenoid valve 38, the second backflush solenoid valve 39, the sewage pump 2, the first motor 8, the dosing metering pump 12, the water outlet pump 13, the first two-position three-way solenoid valve 14, and the second two-position three-way solenoid valve 16 are all connected to an electronic control device 19, which is connected to a display screen 20. The electronic control device 19 is a single-chip microcomputer or an integrated circuit.

[0040] The utility model has a simple structure and can realize a normal sewage discharge process or a backwash recovery process by switching the conduction direction of the first two-position three-way solenoid valve 14 and the second two-position three-way solenoid valve 16, in cooperation with the backwash pump 37. The separated magnetic biochar can be conveniently backwashed back to the reaction chamber 7 through the backwash recovery process, thereby realizing efficient recovery and reuse of the magnetic biochar.

[0041] The utility model also includes a pH control mechanism, which includes an acid tank 21 for containing an acidic solution, an alkali tank 22 for containing an alkaline solution, and a four-position four-way solenoid valve 23. In this embodiment, the acid tank 21 contains sulfuric acid solution, and the alkali tank 22 contains sodium hydroxide solution.

[0042] The first inlet of the four-position, four-way solenoid valve 23 is connected upward to the acid tank 21, and the second inlet of the four-position, four-way solenoid valve 23 is connected upward to the alkali tank 22. The first outlet of the four-position, four-way solenoid valve 23 is connected to the upper portion of the reaction chamber 7 via a pipeline. The outlet of the magnetic separator is connected to the discharge pipe 17, which leads to the drainage tank 25. The second outlet of the four-position, four-way solenoid valve 23 is also connected to the drainage tank 25 via a pipeline. When the four-position, four-way solenoid valve 23 is in the closed state, its valve core is in the position that closes all its inlets and outlets.

[0043] A first pH sensor 24 is suspended downward from the top cover 4 through a connecting line. The first pH sensor 24 extends downward to below the liquid level of the reaction chamber. The first pH sensor 24 and the four-position four-way solenoid valve 23 are respectively connected to the electronic control device 19.

[0044] According to the signal from the first pH sensor 24, by switching the working state (valve core position) of the four-position four-way solenoid valve 23, an acidic solution or an alkaline solution can be selectively added to the reaction chamber 7 to adjust the pH value of the liquid in the reaction chamber 7 to 3-3.5, thereby providing good acidic conditions for the Fenton reaction and improving the efficiency of the Fenton reaction.

[0045] A cover plate 36 is provided at the open top of the drainage box 25, and a second pH sensor 26 is suspended from the cover plate 36 through a connecting line. The second pH sensor 26 is located in the middle of the drainage box 25; a sewage pipe 27 is connected to the bottom of the drainage box 25, and a sewage solenoid valve 28 is provided on the sewage pipe 27; the second pH sensor 26 and the sewage solenoid valve 28 are respectively connected to the electronic control device 19.

[0046] A second motor 40 is mounted on the cover plate 36. The output shaft of the second motor 40 extends downward into the drainage tank 25 and is connected to a second stirring blade 41. The second motor 40 is connected to the electronic control device 19. Before discharge, the second motor 40 is turned on to rotate the second stirring blade 41, thereby uniformizing the pH of the discharged water.

[0047] According to the signal of the second pH sensor 26, by switching the working state (valve core position) of the four-position four-way solenoid valve 23, acidic solution or alkaline solution can be selectively added to the drainage tank 25 to adjust the pH value of the discharged liquid to about 7. The four-position four-way solenoid valve 23 is closed, the addition of acid and alkaline solution is stopped, and the second motor 40 is turned off to avoid acid and alkaline pollution to the environment.

[0048] The magnetic separator includes an upper shell 29 and a lower shell 30 that are connected to each other. The outer cover of the lower shell 30 is provided with an annular electromagnet 32, which is connected to the electronic control device 19; the recoil interface 15 is connected to the lower shell 30;

[0049] The magnetic separator has a simple structure. When the treated wastewater passes through the magnetic separator, the flow rate of the water in the upper shell of the magnetic separator becomes slow, and the annular electromagnet 32 ​​is energized to adsorb the magnetic biochar in the magnetic separator and sink it into the lower shell 30.

[0050] The connection states of the first two-position three-way solenoid valve 14 and the second two-position three-way solenoid valve 16 are switched, and the backflushing pump 37 is used to allow a small amount of water from the drainage tank 25 to carry the magnetic biochar through the backflushing interface 15 through the first two-position three-way solenoid valve 14 and the second two-position three-way solenoid valve 16 into the reaction chamber 7 of the Fenton reactor, thereby realizing the recovery and reuse of the magnetic biochar. The entire recovery process does not require manual collection. Compared with the past, the process of recovering the magnetic biochar is very convenient and efficient.

[0051] During normal treatment of wastewater containing azo dyes, the sewage pump 2 is turned on by the electronic control device 19 to send the wastewater to be treated in the wastewater tank 1 into the reaction chamber 7. After the wastewater is added, the sewage pump 2 is turned off.

[0052] The dosing metering pump 12 is turned on by the electronic control device 19. The side wall of the tank 3 is preferably provided with a scale line indicating the water level. By observing the water level on the scale line, the hydrogen peroxide solution required for the Fenton reaction is added to the reaction chamber 7 in a corresponding quantitative manner. The staff adds the magnetic biochar required for the Fenton reaction to the reaction chamber 7 through the magnetic biochar feeding port 9.

[0053] The first motor 8 is turned on by the electronic control device 19, so that the first stirring blade 10 stirs the liquid and magnetic biochar in the reaction chamber 7, promoting the magnetic biochar to fully adsorb the azo dye, facilitating the efficient Fenton reaction and oxidatively degrading the azo dye.

[0054] The staff monitors the signal from the first pH sensor 24 via the display 20. When the pH value of the waste liquid in the reaction chamber 7 exceeds 3.5, the staff controls the four-position, four-way solenoid valve 23 via the electronic control device 19 to open its first inlet and first outlet, thereby injecting an acidic solution into the reaction chamber 7. The pH value of the waste liquid in the reaction chamber 7 drops to 3, at which point the four-position, four-way solenoid valve 23 is closed to stop the injection. When the pH value of the waste liquid in the reaction chamber 7 drops below 3.0, the staff controls the four-position, four-way solenoid valve 23 via the electronic control device 19 to open its second inlet and first outlet, thereby injecting an alkaline solution into the reaction chamber 7. The pH value of the waste liquid in the reaction chamber 7 reaches 3, at which point the four-position, four-way solenoid valve 23 is closed to stop the injection. By injecting the acidic or alkaline solution, the pH value in the reaction chamber 7 is controlled between 3 and 3.5, ensuring that the acidic conditions for the Fenton reaction to degrade azo dyes remain within the optimal range and preventing the dissolution of iron salts in the magnetic biochar in an environment with a pH value below 3.

[0055] After the azo dye is adsorbed by the magnetic biochar, the azo dye on the magnetic biochar is degraded by hydrogen peroxide under the catalysis of ferrous ions. The reaction time in the reaction chamber 7 is greatly shortened compared to when only ordinary catalysts (catalysts containing ferrous ions) are used without using magnetic biochar, and can be controlled to about 1 hour, significantly improving the reaction speed.

[0056] After the reaction, the wastewater in the reaction chamber becomes colorless (or its absorbance is close to zero as measured by a visible light spectrophotometer). The operator then shuts off the first motor 8 via the electronic control device 19, stopping stirring. Simultaneously, the annular electromagnet, the outlet pump 13, and the first backflush solenoid valve 38 on the discharge pipe 17 are opened. The first two-position, three-way solenoid valve 14 selectively connects the outlet pump 13 with the second two-position, three-way solenoid valve 16, and the second two-position, three-way solenoid valve 16 selectively connects the first two-position, three-way solenoid valve 14 with the magnetic separator, allowing the reacted liquid to enter the magnetic separator. As the water flow slows, the magnetic field generated by the annular electromagnet 32 ​​draws most of the magnetic biochar downward, causing it to sink into the lower housing 30. The liquid, free of most of the magnetic biochar, continues through the magnetic separator outlet and the discharge pipe 17 into the drain tank 25. After the outlet pump 13 delivers the liquid from the reaction chamber 7 to the drain tank 25, the outlet pump 13 and all valves are closed.

[0057] Before pH adjustment of the water in the drainage tank 25, the annular electromagnet 32 ​​is turned off to prevent the magnetic biochar from adsorbing it. The electronic control device 19 then opens the backwash pump 37 and the second backwash solenoid valve 39, closes the first backwash solenoid valve 38, and controls the conduction states of the first, second, third, and fourth solenoid valves 14, 16. This allows the water from the backwash pump 37 to flow through the backwash port 15 of the magnetic separator, the first, second, third, and fourth solenoid valves 14, 16, and then into the reaction chamber 7. This water, carrying the magnetic biochar particles in the lower housing 30, flows back into the reaction chamber 7, enabling convenient and rapid recovery and reuse of the magnetic biochar particles. Once the backwash water entering the reaction chamber changes from black (water containing magnetic biochar is black) to colorless, all valves and pumps are closed, preparing for the next treatment of wastewater containing azo dyes. Since the amount of magnetic biochar added is small (about 0.5 grams per liter of wastewater), it is concentrated in the lower shell of the magnetic separator after magnetic adsorption, and the amount of water used for backwashing is very small.

[0058] The operator monitors the signal from the second pH sensor 26 on the display 20. When the pH value of the liquid in the drain tank 25 deviates from 7, the operator operates the four-position, four-way solenoid valve 23 accordingly, adding an acidic or alkaline solution to the drain tank 25 until the pH value of the liquid in the drain tank 25 reaches approximately 7. The electronic control device 19 then opens the drain solenoid valve 28, draining the treated liquid. Because the liquid is neutralized before discharge, pH contamination of the environment is avoided.

[0059] The above embodiments are only used to illustrate rather than limit the technical solutions of the present invention. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that the present invention can still be modified or replaced by equivalents. Any modification or partial replacement that does not depart from the spirit and scope of the present invention should be included in the scope of the claims of the present invention.

Claims

1. A laboratory azo dye wastewater treatment device, comprising a wastewater tank and a Fenton reactor, wherein the bottom of the wastewater tank is connected to a sewage pump; the Fenton reactor comprises a box body, and the top of the box body is provided with a top cover; the device is characterized by: An organic glass plate is provided at the bottom of the box, and the inner cavity of the box serves as a reaction chamber; the outlet of the sewage pump is connected to the bottom of the reaction chamber through a pipeline; The top cover is provided with a first motor and a magnetic biochar feeding port, and the output shaft of the first motor extends downward into the reaction chamber and is connected to a first stirring blade; The upper part of the box is connected to a hydrogen peroxide solution container through a hydrogen peroxide solution filling pipe, and a dosing metering pump is provided on the hydrogen peroxide solution filling pipe; The lower part of the reaction chamber is connected to a water outlet pump, the outlet of the water outlet pump is connected to a first two-position three-way solenoid valve, the first two-position three-way solenoid valve has an outlet and two selective inlets; the two selective inlets of the first two-position three-way solenoid valve are respectively connected to the backflush interface of the magnetic separator and the water outlet pump; the outlet of the first two-position three-way solenoid valve is connected to a second two-position three-way solenoid valve; The second two-position three-way solenoid valve has three interfaces, a first interface of the second two-position three-way solenoid valve is connected to the first two-position three-way solenoid valve, a second interface of the second two-position three-way solenoid valve is connected to the inlet of the magnetic separator, and a third interface of the second two-position three-way solenoid valve is connected to the reaction chamber; the second two-position three-way solenoid valve controls its first interface to selectively connect to its second interface or its third interface; The outlet of the magnetic separator is connected to a discharge pipe; the discharge pipe is connected to a recoil bypass pipe, a recoil pump is connected in series to the recoil bypass pipe, a first recoil solenoid valve is provided on the discharge pipe between both ends of the recoil bypass pipe, the outlet direction of the recoil pump is toward the magnetic separator, and a second recoil solenoid valve is provided on the recoil bypass pipe at the outlet of the recoil pump; The water outlet pump, the backwash pump, the first backwash solenoid valve, the second backwash solenoid valve, the sewage pump, the first motor, the dosing metering pump, the first two-position three-way solenoid valve and the second two-position three-way solenoid valve are all connected to an electronic control device connected to a display screen.

2. The laboratory azo dye wastewater treatment device according to claim 1, characterized in that: It also includes a pH control mechanism, which includes an acid tank for containing acidic solution, an alkaline tank for containing alkaline solution, and a four-position four-way solenoid valve; The first inlet of the four-position four-way solenoid valve is connected to the acid tank upward, and the second inlet of the four-position four-way solenoid valve is connected to the alkali tank upward; the first outlet of the four-position four-way solenoid valve is connected to the reaction chamber through a pipeline; The discharge pipe connected to the outlet of the magnetic separator leads to the drainage box, and the second outlet of the four-position four-way solenoid valve is connected to the drainage box through a pipeline; a first pH sensor is suspended downward from the top cover through a connecting line, and the first pH sensor extends downward to below the liquid level of the reaction chamber; the first pH sensor and the four-position four-way solenoid valve are respectively connected to the electronic control device.

3. The laboratory azo dye wastewater treatment device according to claim 2, characterized in that: A cover plate is provided at the open top of the drainage box, and a second pH sensor is suspended from the cover plate via a connecting line. The second pH sensor is located in the middle of the drainage box; a sewage pipe is connected to the bottom of the drainage box, and a sewage solenoid valve is provided on the sewage pipe; a second motor is provided on the cover plate, and the output shaft of the second motor extends downward into the drainage box and is connected to a second stirring blade; The second pH sensor, the second motor and the sewage discharge solenoid valve are respectively connected to the electronic control device.

4. The laboratory azo dye wastewater treatment device according to any one of claims 1 to 3, characterized in that: The magnetic separator comprises an upper shell and a lower shell which are communicated with each other. The outer cover of the lower shell is provided with an annular electromagnet which is connected with the electric control device. The recoil interface is communicated with the lower shell.

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