A developing wastewater treatment system and method for treating waste with waste based on sludge biochar

Abstract

The present invention belongs to the field of organic wastewater treatment, discloses a developing wastewater treatment system and method based on sludge biochar for waste treatment, which is sequentially provided with a premixing tank, a nano-ozone bubble generator, a biochar catalytic reactor, a biochar filter bed stabilizer and a controller, wherein the premixing tank is connected to the nano-ozone bubble generator by a connecting pipe, the nano-ozone bubble generator is connected to the biochar catalytic reactor by a biochar catalytic reactor water inlet and its pipeline, the biochar catalytic reactor is connected to the biochar filter bed stabilizer by a water distributor pipeline, and the biochar filter bed sample port of the biochar filter bed stabilizer is connected to the controller water inlet of the controller. The present invention can solve the problems of current TMAH biological treatment difficulties, inaccurate analysis and detection, serious corrosion to urban pipe networks, high operating costs, relatively high energy consumption, large degree of manual intervention, and inconvenient management.

Description

Technical Field

[0001] The present invention relates to the field of organic wastewater treatment, and in particular to a developing wastewater treatment system and method based on sludge biochar for waste treatment. Background Art

[0002] Tetramethylammonium hydroxide (TMAH) is a primary component of the developer used in the manufacturing of thin-film liquid crystal displays (LCDs). With the booming development of this industry, a significant number of environmental pollution issues remain to be addressed. TMAH wastewater, in particular, has attracted widespread attention due to its high concentrations of organic nitrogen and carbon, high pH, and biotoxicity. Catalytic nano-ozone technology is a novel wastewater treatment technology that, compared to traditional biological treatment technologies, offers high efficiency, rapid response, a small footprint, ease of management, and a high degree of automation.

[0003] At present, there are still many problems in the treatment of TMAH wastewater in actual projects, such as: (1) Traditional biological treatment cannot effectively degrade TMAH. After the wastewater is discharged, the residual TMAH will corrode the urban pipe network and reduce the service life of the urban pipe network; (2) TMAH has a high antioxidant property and cannot be oxidized by the potassium dichromate method. When using chemical oxygen demand (COD) as its emission indicator, it is easy to misjudge, resulting in the COD value of residual organic matter in the final effluent water not meeting the emission standards. (3) Commonly used reaction equipment cannot operate continuously, the degree of manual intervention is high, management is inconvenient, and the cost is high. These problems limit the effective treatment of TMAH wastewater in actual projects. Summary of the Invention

[0004] In view of the many shortcomings of the existing technology in actual engineering applications, the purpose of the present invention is to provide a developer wastewater treatment system and method based on sludge biochar to treat waste with waste. The system mainly utilizes phenolic wastewater to neutralize tetramethylammonium hydroxide wastewater, so that the pH of the tetramethylammonium hydroxide wastewater is within an easily degradable range. At the same time, the easily degradable property of phenolic substances is utilized to induce the degradation of the tetramethylammonium hydroxide wastewater. At the same time, modified Ag and Fe3O4-loaded biochar molded fillers are used to catalyze nano-ozone, and the removal of sewage pollutants is achieved through the path of adsorption, oxidation, and reoxidation. The biochar filter bed stabilizer is used to adsorb, catalyze and remove residual ozone, and intelligent control is achieved through a controller to monitor and adjust the TOC of the effluent. The system solves the current problems of difficult TMAH biological treatment, inaccurate analysis and detection, serious corrosion to urban pipe networks, high operating costs, relatively high energy consumption, large degree of manual intervention, and inconvenient management.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions:

[0006] A developing wastewater treatment system based on sludge biochar for waste treatment comprises a premixing tank, a nano-ozone bubble generator, a biochar catalytic reaction tank, a biochar filter bed stabilizer and a controller, wherein the premixing tank is connected to the nano-ozone bubble generator via a connecting pipe, the nano-ozone bubble generator is connected to the biochar catalytic reaction tank via a water inlet of the biochar catalytic reaction tank and its pipe, the biochar catalytic reaction tank is connected to the biochar filter bed stabilizer via a water distributor pipe, and the biochar filter bed sample port of the biochar filter bed stabilizer is connected to the water inlet of the controller.

[0007] A stirring paddle is provided inside the premixing tank, which is connected to a stirring paddle motor. A tetramethylammonium hydroxide wastewater inlet and a phenol wastewater inlet are provided at the bottom of the premixing tank, and the two are arranged up and down.

[0008] The biochar catalytic reaction tank is equipped with a nano-ozone emitter at the bottom, connected to the water inlet of the biochar catalytic reaction tank. It is filled with biochar catalyst filler, and equipped with a pressure balance valve at the top and a pressure balance valve at the upper side. The pressure balance valve maintains a certain pressure in the biochar catalytic reaction tank, thereby maintaining the micro-nano ozone bubble state for a longer period of time, reducing the collision of nano-bubbles, and enhancing the dispersion and dissolution of ozone in the sewage, thereby improving the utilization rate of ozone.

[0009] Furthermore, the biochar catalyst filler is made by mixing dewatered sludge from a sewage treatment plant with a certain proportion of corn straw, silver nitrate, ferric nitrate and clay, and then pressing the mixture into a mold and calcining it under high temperature anaerobically.

[0010] Furthermore, the biochar catalyst filler is made of dewatered sludge from a sewage treatment plant mixed with a certain proportion of corn straw, wheat straw, and ZnCl2, activated and then anaerobic roasted and acid washed, with a specific surface area of about 890m 2 / g.

[0011] A water distributor is provided on the upper part of the biochar filter bed stabilizer, which is connected to the water inlet of the water distributor through a water distributor pipeline. A biochar filter bed is provided below the water distributor, which is filled with composite sludge porous biochar filler. A water collector is provided below the biochar filter bed, which is connected to the biochar filter bed drain port and the biochar filter bed sample port through a two-way electric water valve.

[0012] The controller is equipped with a fully automatic TOC analyzer, a control unit and an excessive sample retention device. The water inlet of the controller is connected to the water pump unit, and the water pump unit is connected to the water supply pipeline, the circulation pool and the return pipeline in sequence. The fully automatic TOC analyzer is connected to the circulation pool, the medication bottle, the waste liquid barrel and the control unit respectively. The Internet antenna is located above the control unit. The Internet antenna is a plug-in card type with a data transmission function. The line connected to the control unit is fixed to the controller through a wiring slot. The excessive sample retention device is connected to the water pump unit through a sample retention pipeline. A tool box and a cabinet air conditioner are provided inside the controller.

[0013] Furthermore, the premixing tank is provided with a pH value detector; a water pump and a solenoid valve are provided between the premixing tank and the nano-ozone bubble generator; a solenoid valve is provided between the nano-ozone bubble generator and the biochar catalytic reaction tank, the biochar filter bed stabilizer is provided with a liquid level sensor, and the tetramethylammonium hydroxide reservoir and the phenol wastewater reservoir are provided with a water pump and a liquid level sensor.

[0014] A method for treating developing wastewater by using sludge biochar to treat wastewater comprises the following steps:

[0015] Step (1): When the water levels of the tetramethylammonium hydroxide reservoir and the phenolic wastewater reservoir simultaneously reach the low water level line, the controller displays a water signal; when the water levels of the tetramethylammonium hydroxide reservoir and the phenolic wastewater reservoir simultaneously reach the high water level line, the tetramethylammonium hydroxide reservoir water pump starts operating, and the solenoid valve of the premixing tank is opened at the same time; when the inlet water level of the premixing tank reaches the low water level line, the tetramethylammonium hydroxide reservoir water pump stops, and the phenolic wastewater reservoir water pump starts operating; when the pH in the premixing tank reaches 6 to 9, the phenolic wastewater reservoir water pump stops, and the nano-ozone bubble generator is preheated at the same time;

[0016] Step (2): After 5 minutes, the solenoid valve on the right side of the nano-ozone bubble generator is opened, the water pump is running, and at the same time, the solenoid valve on the left side of the biochar catalytic reaction tank is opened. The mixed wastewater passes through the nano-ozone bubble generator to generate micro-nano ozone bubble water, which is input into the biochar catalytic reaction tank. When the water level reaches the set water level line of the biochar catalytic reaction tank, the nano-ozone bubble generator stops running, and the solenoid valve on the left side of the biochar catalytic reaction tank is closed at the same time. The premixing tank is replenished with water according to the steps described in step (1);

[0017] Step (3): After the reaction has lasted for 30-60 minutes, the nano-ozone bubble generator is preheated and turned on, the biochar catalytic reaction tank is replenished with water, and the treated water enters the biochar filter bed stabilizer through the water distributor, and then enters the water distributor after passing through the activated carbon filter bed. After stabilization for 20-40 minutes, the two-way electric water valve is opened, and the sample water enters the controller;

[0018] Step (4): The sample water in the controller is pumped into the water supply pipeline through the water pump unit. After the sample water reaches the circulation pool, the fully automatic TOC analyzer senses the water signal and starts sampling and measuring. After the test is completed, the system records the data and uploads it to the cloud. If the water sample meets the standard, the biochar filter bed stabilizer will treat the water and discharge it. If it does not meet the standard, the cloud will issue a warning. At the same time, the substandard treated water will enter the excessive sample retention device for retention. The staff can manually test the excessive water samples, analyze the reasons for the non-compliance, and adjust the instruments and equipment in time. After the fully automatic TOC analyzer completes the sampling, the system enters the standby power saving state and waits for the water signal to appear in the water reservoir to repeat the above steps.

[0019] Preferably, the stirring rate of the premixing tank is 10 to 20 r / min.

[0020] Preferably, the ozone generation capacity of the nano-ozone bubble generator is 10 to 20 g / h.

[0021] Compared with the prior art, the present invention has the following beneficial effects:

[0022] 1. The present invention adopts sludge-based biochar catalyst molded filler combined with micro-nano ozone bubble catalytic technology. The sludge-based biochar catalyst molded filler has rich microporous and mesoporous structures, metal active sites, carbon defects and surface functional groups, among which Ag and Fe3O4 and organic structures play the main catalytic role. The three jointly catalyze, and the molded catalyst filler is evenly distributed in the biochar catalytic reaction tank, can fully contact with the nano ozone bubbles, and adsorb the ozone generated after the nano bubbles burst, greatly improving the gas-liquid mass transfer efficiency and ozone utilization rate of the system, thereby solving the problems of low ozone catalytic efficiency, low ozone utilization rate, high operating cost, serious ceramic membrane clogging, relatively high energy consumption, large degree of manual intervention, and inconvenient management in traditional ozone catalytic oxidation technology. In addition, compared with other catalysts, the sludge-based biochar catalyst molded filler used in the present invention has cheap and easy-to-obtain raw materials, simple preparation process, and excellent catalytic performance.

[0023] 2. The micro-nano ozone bubble catalytic technology used in the present invention produces micro-nano bubbles with small particle size, large specific surface area, long contact time and residence time. In addition, through pressure control, high pressure is formed inside the micro-nano ozone bubbles. The high temperature and high pressure generated locally when the bubbles break can effectively promote the generation of free radicals, thereby further improving the pollutant removal effect. The composite sludge porous biochar filler has a large specific surface area of about 890m 2 / g, the catalyst is rich in microporous and mesoporous structure and has strong adsorption capacity. It can effectively adsorb organic matter and residual ozone in sewage, fully and stably remove residual ozone, and remove part of nitrogen, phosphorus and TOC.

[0024] 3. The present invention adopts PLC or PC programming to control the system, which has a high degree of automation, small manual intervention, simple operation and maintenance, and can use the Internet function to remotely monitor and adjust the status of the equipment system. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 This is a schematic structural diagram of a developing wastewater treatment system based on sludge biochar for waste treatment according to the present invention;

[0026] Figure 2 This is a schematic structural diagram of the premixing tank and nano-ozone bubble generator of the present invention;

[0027] Figure 3 This is a schematic diagram of the structure of the biochar catalytic reaction tank of the present invention;

[0028] Figure 4 This is a schematic structural diagram of the biochar filter bed stabilizer of the present invention;

[0029] Figure 5 Schematic diagram of the controller structure of the present invention.

[0030] The reference numerals represent: 1 premixing tank; 2 nano-ozone bubble generator; 3 biochar catalytic reaction tank; 4 biochar filter bed stabilizer; 5 controller; 6 stirring paddle motor; 7 stirring paddle; 8 tetramethylammonium hydroxide wastewater inlet; 9 phenol wastewater inlet; 11 premixing tank outlet; 12 nano-ozone bubble generator inlet; 13 connecting pipe; 14 nano-ozone bubble generator outlet; 16 biochar catalyst filler; 17 nano-ozone bubble emitter; 18 biochar catalytic reaction tank inlet; 19 pressure balance valve; 20 biochar catalytic reaction Tank water outlet; 21 water distributor inlet; 22 water distributor pipeline; 23 water distributor; 25 water collector; 26 reaction tank bracket; 27 biochar filter bed; 28 two-way electric water valve; 29 biochar filter bed drain outlet; 30 biochar filter bed sample port; 31 controller water inlet; 32 water pump unit; 33 water supply pipeline; 34 circulation pool; 35 return water pipeline; 36 wiring trough; 37 control unit; 38 fully automatic TOC analyzer; 39 Internet antenna; 40 medicine bottle; 41 waste liquid bucket; 42 tool box; 43 sample retention pipeline; 44 excessive sample retention device; 45 cabinet air conditioner. DETAILED DESCRIPTION

[0031] The present invention is described in detail below by specific examples, but the scope of protection of the present invention is not limited. Unless otherwise specified, the experimental methods adopted in the present invention are all conventional methods, and the experimental equipment, materials, reagents, etc. used can be obtained from commercial channels.

[0032] Example 1

[0033] like Figure 1As shown, a developing wastewater treatment system based on sludge biochar for waste treatment includes a premixing tank 1, a nano-ozone bubble generator 2, a biochar catalytic reaction tank 3, a biochar filter bed stabilizer 4 and a controller 5.

[0034] like Figure 2 As shown, the premixing tank 1 is located on the left side of the entire catalytic reaction system, including a stirring paddle 7, a tetramethylammonium hydroxide wastewater inlet 8, a phenolic wastewater inlet 9, a premixing tank 10 and a premixing tank outlet 11, the stirring paddle 7 is located inside the premixing tank 10 and is connected to an external stirring paddle motor 6, the tetramethylammonium hydroxide wastewater inlet 8 and the phenolic wastewater inlet 9 are located on the right side of the premixing tank 1, and the two are arranged up and down, the premixing tank outlet 11 is located on the right side of the premixing tank 1, and is connected to the nano-ozone bubble generator water inlet 14 through a connecting pipe 13, and a water pump and a solenoid valve are provided between the premixing tank outlet 11 and the nano-ozone bubble generator water inlet 14. A nano-ozone bubble generator outlet 14 is provided on the right side of the nano-ozone bubble generator 2, and the nano-ozone bubble generator outlet 14 is sequentially connected to the nano-ozone bubble releaser 17 through a pipeline biochar catalytic reaction tank water inlet 18.

[0035] like Figure 3 As shown, the biochar catalytic reaction tank 3 is provided with a biochar catalyst filler 16, a pressure balancing valve 19 and a biochar catalytic reaction tank water outlet 20. The biochar catalyst filler 16 is located inside the biochar catalytic reaction tank 15, the pressure balancing valve 19 is located above the biochar catalytic reaction tank 15, and the biochar catalytic reaction tank water outlet 20 is located at the upper right of the biochar catalytic reaction tank 15 and is connected to the water inlet 21 of the water distributor of the biochar filter bed stabilizer 4;

[0036] like Figure 4 As shown, the biochar filter bed stabilizer 4 is provided with a biochar filter bed stabilization tank 24, a water distributor 23, a water collector 25 and a biochar filter bed 27. The water distributor 23 is located above the biochar filter bed stabilization tank 24 and is connected to the water distributor water inlet 21 through the water distributor pipeline 22. A biochar filter bed 27 is provided below the water distributor 23. A water collector 25 is provided below the biochar filter bed 27. The water collector 25 is respectively connected to the biochar filter bed drain port 29 and the biochar filter bed sample port 30 through a two-way electric water valve 28. The biochar filter bed sample port 30 is connected to the controller water inlet 31 through a pipeline.

[0037] The controller 5 is provided with a fully automatic TOC analyzer 38, a control unit 37 and an excessive sample retention device 44. The water inlet 31 of the controller is connected to the water pump unit 32, and the water pump unit 32 is connected to the water supply pipeline 33, the circulation pool 34 and the return water pipeline 35 in sequence. The fully automatic TOC analyzer 38 is connected to the circulation pool 34, the medication bottle 40, the waste liquid bucket 41 and the control unit 37 respectively. The Internet antenna 39 is located above the control unit 37. The control unit 37 line is fixed to the left side of the controller 5 through the wiring slot 36. The excessive sample retention device 44 is connected to the water pump unit 32 through the sample retention pipeline 43. A toolbox 42 and a cabinet air conditioner 45 are provided inside the controller 5.

[0038] The above-mentioned developing wastewater treatment system based on sludge biochar was used to treat a certain tetramethylammonium hydroxide wastewater:

[0039] A certain tetramethylammonium hydroxide wastewater has a TMAH concentration of about 200 mg / L, a TOC concentration of about 267 mg / L, and a phenol wastewater concentration of 200 mg / L. They are discharged into the reservoir respectively. When the water level in the reservoir reaches the low water level line, the controller 5 displays a water signal. When the water level in the reservoir reaches the high water level line, the water pump of the tetramethylammonium hydroxide reservoir starts to operate. At the same time, the solenoid valve of the premixing tank 1 opens. When the inlet water level of the premixing tank 1 reaches the low water level line, the water pump of the tetramethylammonium hydroxide reservoir stops and the water pump of the phenol wastewater reservoir starts to operate. When the pH in the premixing tank 1 reaches 6-9, the water pump of the phenol wastewater reservoir stops and the nano-ozone bubble generator 2 is preheated.

[0040] Step 2) After 5 minutes, the solenoid valve on the right side of the nano-ozone bubble generator 2 is opened to start the water pump. At the same time, the solenoid valve on the left side of the biochar catalytic reaction tank 3 is opened. The mixed wastewater passes through the nano-ozone bubble generator 2 to generate micro-nano ozone bubble water, which is input into the biochar catalytic reaction tank 3. When the water level reaches the set water level line of the biochar catalytic reaction tank 3, the nano-ozone bubble generator 2 stops running, the above valves are closed at the same time, and the premixing tank is replenished with water according to the above steps.

[0041] Step 3) After 30-60 minutes of reaction, the nano-ozone bubble generator 2 is preheated and turned on, and the biochar catalytic reactor is replenished with water. The treated water enters the biochar filter bed stabilizer 4 through the water distributor 23, then enters the activated carbon filter bed and enters the water distributor 23. After stabilization for 20-40 minutes, the two-way electric water valve is opened, and the sample water enters the controller 5.

[0042] Step 4) The sample water in the controller 5 is pumped into the water supply pipeline 33 via the water pump unit 32. After the sample water reaches the circulation pool 34, the fully automatic TOC analyzer 38 senses the water signal and begins sampling and testing. After the test is completed, the system records the data and uploads it to the cloud. If the water sample meets the standards, the biochar filter bed stabilizer 4 treats the water and discharges it. If it does not meet the standards, the cloud issues a warning and analyzes the reasons for the non-compliance, reminding staff to adjust the parameters. At the same time, the non-compliant treated water enters the excess sample retention device 44 for retention. After the water quality monitor completes the sampling, the system enters the standby power-saving state and waits for the water signal to appear in the water reservoir to repeat the above steps.

[0043] After treatment with the above process parameters, the TMAH removal rate was about 86.45%, the TOC removal rate was about 65.3%, and the phenol removal rate was about 89.7%.

[0044] The above description is only a preferred specific embodiment of the present invention and does not limit the present invention to this. Any modifications, equivalent substitutions and improvements made by technicians familiar with this technical field within the technical scope and principles disclosed in the present invention should be covered by the protection scope of the present invention.

Claims

1. A tetramethylammonium hydroxide wastewater treatment system based on sludge biochar to treat waste, characterized by: A premixing tank (1), a nano-ozone bubble generator (2), a biochar catalytic reaction tank (3), a biochar filter bed stabilizer (4) and a controller (5) are sequentially provided. The premixing tank (1) and the nano-ozone bubble generator (2) are connected via a connecting pipe (13). The nano-ozone bubble generator (2) and the biochar catalytic reaction tank (3) are connected via a water inlet (18) of the biochar catalytic reaction tank and its pipe. The biochar catalytic reaction tank (3) and the biochar filter bed stabilizer (4) are connected via a water distributor pipe (22). The biochar filter bed sample port (30) of the biochar filter bed stabilizer (4) is connected to the controller (5). The controller water inlet (31) of the premixing tank (5) is connected, a tetramethylammonium hydroxide wastewater inlet (8) and a phenol wastewater inlet (9) are provided at the bottom of the premixing tank (1), and the two are arranged up and down. A nano-ozone bubble releaser (17) is provided at the bottom of the biochar catalytic reaction tank (3), and the nano-ozone bubble releaser (17) is connected to the water inlet (18) of the biochar catalytic reaction tank; the interior of the biochar catalytic reaction tank (3) is filled with a biochar catalyst filler (16), and the biochar catalyst filler (16) is made of dewatered sludge from a sewage treatment plant mixed with corn straw, silver nitrate, ferric nitrate and clay, and then anaerobic calcined at high temperature.

2. The tetramethylammonium hydroxide wastewater treatment system based on sludge biochar as claimed in claim 1 is characterized in that: A stirring paddle (7) is provided inside the premixing tank (1), and the stirring paddle (7) is connected to the stirring paddle motor (6).

3. The tetramethylammonium hydroxide wastewater treatment system based on sludge biochar as claimed in claim 1 is characterized in that: A pressure balancing valve (19) is provided on the top of the biochar catalytic reaction tank (3); and a biochar catalytic reaction tank water outlet (20) is provided on the upper side of the biochar catalytic reaction tank (3).

4. The tetramethylammonium hydroxide wastewater treatment system based on sludge biochar as claimed in claim 1 is characterized in that: A water distributor (23) is provided on the upper part of the biochar filter bed stabilizer (4), and the water distributor (23) is connected to the water distributor water inlet (21) through a water distributor pipeline (22). A biochar filter bed (27) is provided below the water distributor (23), and the biochar filter bed (27) is filled with a composite sludge porous biochar filler. A water collector (25) is provided below the biochar filter bed (27), and the water collector (25) is connected to the biochar filter bed drain port (29) and the biochar filter bed sample port (30) through a two-way electric water valve (28).

5. The tetramethylammonium hydroxide wastewater treatment system based on sludge biochar as claimed in claim 4 is characterized in that: The controller (5) is provided with a fully automatic TOC analyzer (38), a control unit (37) and an excessive sample retainer (44). The water inlet (31) of the controller is connected to the water pump unit (32). The water pump unit (32) is connected to the water supply pipeline (33), the circulation pool (34) and the return water pipeline (35) in sequence. The fully automatic TOC analyzer (38) is connected to the circulation pool (34), the medication bottle (40), the waste liquid barrel (41) and the control unit (37) respectively. The Internet antenna (39) is located above the control unit (37). The Internet antenna (39) is a plug-in card type. The line connected to the control unit (37) is fixed to the controller (5) through the wiring slot (36). The excessive sample retainer (44) is connected to the water pump unit (32) through the sample retaining pipeline (43). The controller (5) is provided with a tool box (42) and a cabinet air conditioner (45) inside.

6. A method for treating tetramethylammonium hydroxide wastewater based on sludge biochar, characterized by: The wastewater treatment system according to claim 5 comprises the following steps: Step (1): When the water levels of the tetramethylammonium hydroxide reservoir and the phenol wastewater reservoir reach the low water level line at the same time, the controller (5) displays a water signal; when the water levels of the tetramethylammonium hydroxide reservoir and the phenol wastewater reservoir reach the high water level line at the same time, the water pump of the tetramethylammonium hydroxide reservoir starts to operate, and at the same time, the solenoid valve of the premixing tank (1) opens; when the inlet water level of the premixing tank (1) reaches the low water level line, the water pump of the tetramethylammonium hydroxide reservoir stops, and the water pump of the phenol wastewater reservoir starts to operate; when the pH in the premixing tank (1) reaches 6-9, the water pump of the phenol wastewater reservoir stops, and at the same time, the nano-ozone bubble generator (2) is preheated; Step (2): After 5 minutes, the right electromagnetic valve of the nano-ozone bubble generator (2) is opened, the water pump is running, and at the same time, the left electromagnetic valve of the biochar catalytic reaction tank (3) is opened, and the mixed wastewater passes through the nano-ozone bubble generator (2) to generate micro-nano ozone bubble water, which is input into the biochar catalytic reaction tank (3). When the water level reaches the set water level line of the biochar catalytic reaction tank (3), the nano-ozone bubble generator (2) stops running, and the left electromagnetic valve of the biochar catalytic reaction tank (3) is closed at the same time, and the premixing tank (1) is replenished with water according to the steps described in step (1); Step (3): After 30-60 minutes of reaction, the nano-ozone bubble generator (2) is preheated and turned on, the biochar catalytic reaction tank (3) is replenished with water, and the treated water enters the biochar filter bed stabilizer (4) through the water distributor (23), and then enters the water collector (25) after passing through the biochar filter bed (27). After stabilization for 20-40 minutes, the two-way electric water valve (28) is opened, and the sample water enters the controller (5); Step (4): The sample water in the controller (5) is pumped into the water supply pipe (33) through the water pump unit (32). After the sample water reaches the circulation pool (34), the fully automatic TOC analyzer (38) senses the water signal and starts sampling and measuring. After the test is completed, the system records the data and uploads it to the cloud. If the water sample meets the standard, the biochar filter bed stabilizer (4) will treat the water and discharge it. If it does not meet the standard, the cloud will issue a warning. At the same time, the substandard treated water will enter the excessive sample retention device (44) for retention. The staff can manually test the excessive water samples and analyze the reasons for the non-compliance, and adjust the instruments and equipment in time. After the fully automatic TOC analyzer (38) completes the sample measurement, the system enters the standby power saving state and waits for the water signal to appear in the water reservoir to repeat steps (1)-(4) again.

7. The method for treating tetramethylammonium hydroxide wastewater based on sludge biochar as claimed in claim 6, wherein: The stirring rate of the premixing tank (1) is 10-20 r / min.

8. The method for treating tetramethylammonium hydroxide wastewater based on sludge biochar as claimed in claim 6, wherein: The nano-ozone bubble generator (2) produces ozone in an amount of 10-20 g / h.

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