Automatic classification and recovery device for laboratory waste liquid

Abstract

The utility model belongs to the technical field of environmental protection, and particularly relates to an automatic laboratory waste liquid classification and recovery device which comprises a double-layer rack, a waste liquid receiving tank, a detection unit, a main electromagnetic valve, a six-way liquid separator, branch electromagnetic valves and an intelligent controller. According to the device, through cooperative detection of the conductivity sensor, the pH sensor and the VOC sensor and auxiliary judgment of the oxidation-reduction potential sensor, intelligent classification of six types of waste liquid including organic acid, organic neutral, organic alkaline, inorganic acid, inorganic neutral and inorganic alkaline is achieved. According to the utility model, the automation, precision and safety of laboratory waste liquid recovery are realized, the classification accuracy is more than 98%, the problems of dangerousness of manual operation, inaccurate classification of a traditional device and the like are effectively solved, and the requirements of latest environmental protection specifications are met.

Description

Technical Field

[0001] This utility model belongs to the field of environmental protection technology, specifically relating to an automatic sorting and recycling device for laboratory waste liquid. Background Technology

[0002] During chemical experiments and analytical testing, laboratories generate large quantities of complex waste liquids daily, which may contain hazardous substances such as heavy metal ions, highly corrosive acids and alkalis, toxic organic compounds, and flammable solvents. According to the "National Hazardous Waste List," laboratory waste liquids belong to HW49 category hazardous waste. If discharged directly without proper classification and treatment, they will not only corrode drainage networks but may also harm human health through bioaccumulation, causing irreversible environmental pollution. Statistics show that a single liquid chromatography analysis can generate 200-500 mL of organic waste liquid, while university laboratories typically generate tens of tons of waste liquid annually, highlighting the urgent need for scientific management.

[0003] The current mainstream waste liquid recycling methods still rely on manual sorting. For example, the utility model patent with announcement number CN206350936U adopts a liquid separation structure with multiple tanks and manual valve control. Although this scheme can achieve basic sorting, it has significant defects: (1) Operators need to continuously judge the properties of waste liquid and manually switch the corresponding pipe valves. There is an exposure risk when dealing with highly toxic substances such as benzene series and cyanide; (2) For mixed waste liquids that form azeotropes such as toluene and concentrated sulfuric acid, the static treatment method that relies on gravity stratification is prone to incomplete separation. The residual mixed phase still has the risk of explosion; (3) There is a lack of real-time monitoring module. When strong oxidants and reducing waste liquids are accidentally discharged, it is impossible to give timely warning of possible violent reactions; (4) Traditional liquid collection bottles need to be replaced frequently. During the opening and closing process, there is a risk of fugitive emissions of volatile organic compounds.

[0004] In recent years, although some research has attempted to introduce automation technology, such as the utility model patent with publication number CN210385717U, which attempts to achieve automatic stratification using a float-type density sensor, it can only handle two-phase separation and cannot cope with complex systems containing suspended solids, emulsions, etc. While the invention patent with publication number CN112108033A introduces an image recognition module, in actual testing, the recognition error rate for dark liquids such as concentrated sulfuric acid-benzene mixtures is as high as 23%, and it lacks an anti-siphon structure, posing a risk of cross-contamination. Utility Model Content

[0005] The purpose of this invention is to provide an automatic sorting and recycling device for laboratory waste liquid, to solve the problems of existing adsorption columns having difficulty in regenerating adsorbents and poor separation effects on complex mixtures. To achieve the above objective, this invention adopts the following technical solution:

[0006] An automatic sorting and recycling device for laboratory waste liquid includes:

[0007] A double-layer platform includes a horizontally arranged upper platform, a lower platform, and four vertical support legs connecting the two. A circular slot is opened in the center of the upper platform.

[0008] Waste liquid receiving tank is fixed to the lower surface of the upper platform, and the bottom extends downward to form a funnel-shaped waste liquid collection tank. At least three detection holes are equally spaced on the circumferential sidewall of the waste liquid collection tank, and each detection hole is embedded with a waterproof sealing ring.

[0009] The detection unit includes a conductivity sensor, a pH sensor, and a VOC sensor, with each sensor probe extending into the inner cavity of the collecting tank through a sealing ring;

[0010] The main solenoid valve is vertically installed at the outlet directly below the waste liquid collection tank, with the valve body coaxially aligned with the collection tank.

[0011] The six-way distributor has a main interface at the top that connects to the outlet of the main solenoid valve, and six branch interfaces at the bottom that are distributed at equal angles. The six branch solenoid valves have inlets that connect to the six branch interfaces of the six-way distributor, and outlets that connect to the corresponding waste liquid tanks via corrosion-resistant hoses. The waste liquid tanks are classified into six types: organic acidic, organic neutral, organic alkaline, inorganic acidic, inorganic neutral, and inorganic alkaline.

[0012] The intelligent controller is electrically connected to the conductivity sensor, pH sensor, VOC sensor, main solenoid valve and six branch solenoid valves via shielded cables. It receives signals from the detection unit in real time and controls the on / off state of the main solenoid valve and the six branch solenoid valves.

[0013] Furthermore, the detection unit also includes a redox potential sensor, whose probe extends into the inner cavity of the collecting groove through the sealing ring.

[0014] Furthermore, the tip of each sensor probe is 1-5 mm from the bottom of the waste liquid collection tank.

[0015] Furthermore, the waste liquid receiving tank has an upper opening diameter larger than the diameter of the circular slot opened at the center of the upper platform; a ring-shaped spray pipe is concealed and fixed on the lower surface of the upper platform outside the circular slot, and a ring of spray holes is evenly opened on the ring-shaped spray pipe. The spray direction of the spray holes is inclined at 45° towards the inner wall of the waste liquid receiving tank, and the ring-shaped spray pipe is connected to the tap water pipeline through a high-pressure water pump.

[0016] Furthermore, the branch interface at the bottom of the six-way distributor has an axial angle of 15°-25° downwards from the vertical direction.

[0017] Furthermore, the bottom of the six-way distributor has an internal threaded hole, and a plug is screwed into the threaded hole. The end of the plug is a ball head, and the residual liquid volume is adjusted by adjusting the depth to which the plug is screwed in.

[0018] Furthermore, the organic acidic waste liquid tank is a stainless steel tank lined with polytetrafluoroethylene, the organic neutral waste liquid tank and the inorganic neutral waste liquid tank are stainless steel tanks without lining, the organic alkaline waste liquid tank is a high-density polyethylene tank, the inorganic acidic waste liquid tank is a quartz glass tank, and the inorganic alkaline waste liquid tank is a nylon 66 reinforced tank.

[0019] Furthermore, the waste liquid tank is equipped with a weighing sensor at the bottom, a liquid level alarm on the side wall, and a one-way valve cover at the top.

[0020] Furthermore, the intelligent controller includes an STM32F407 microprocessor and a six-channel relay array. The microprocessor communicates with each sensor via the Modbus protocol, and the output of the relay array is connected to each solenoid valve via an opto-isolation circuit.

[0021] Furthermore, the branch solenoid valve is a normally closed two-position two-way solenoid valve, the valve core uses a polytetrafluoroethylene sealing surface, and the valve body is connected to the branch interface of the six-way distributor via a quick-release clamp.

[0022] This invention has several significant advantages over existing technologies. In terms of classification performance, through the coordinated detection of conductivity, pH, and VOC sensors, combined with the precise control of an intelligent control system, it achieves automatic identification and classification of six types of waste liquids: organic acidic, organic neutral, organic alkaline, inorganic acidic, inorganic neutral, and inorganic alkaline. The classification accuracy rate can reach over 98%, which is 10 times more efficient than traditional manual classification methods. It can also effectively treat complex waste liquid systems containing suspended solids and emulsions.

[0023] In terms of safety, a fully enclosed waste liquid diversion system is adopted, eliminating the need for operators to come into contact with hazardous waste liquid throughout the process, thus fundamentally eliminating the risk of exposure to toxic substances. By setting up an anti-siphon structure and a nano-hydrophobic coating, the cross-contamination rate of waste liquid is controlled below 0.5%, while the physical isolation storage design of organic and inorganic waste liquids effectively avoids the occurrence of dangerous chemical reactions.

[0024] The structural design perfectly combines scientific principles with practicality. Modular component design facilitates maintenance and replacement, while the six-way distributor employs a 15°-25° inclined branch design to ensure residual waste liquid is below 0.1mL. The precise 1-5mm positioning of the sensor probe guarantees accurate detection data. The spray cleaning system enables the equipment to self-clean.

[0025] In terms of environmental performance, the separate storage of waste liquid is more conducive to subsequent professional treatment, reducing the fugitive emissions of volatile organic compounds by more than 95%, fully complying with the latest environmental protection standards such as HJ 1258-2022. The entire device is made of corrosion-resistant materials, has a long service life, low maintenance costs, and is suitable for the waste liquid treatment needs of various laboratories. Attached Figure Description

[0026] Figure 1 This is a schematic diagram of the structure of this utility model.

[0027] Figure 2 yes Figure 1 A magnified view of a portion of the image.

[0028] Figure 3 yes Figure 1 A magnified partial sectional view.

[0029] Figure 4 and 5 This is a schematic diagram of the waste liquid receiving tank of this utility model from different perspectives.

[0030] Figure 6 This is a schematic diagram of the structure of the six-way liquid separator of this utility model.

[0031] Figure 7 This is a schematic diagram of the structure of the annular spray pipe of this utility model. Detailed Implementation

[0032] The technical solutions of the present invention will be clearly and completely described below with reference to the accompanying drawings of the embodiments of the present invention.

[0033] like Figure 1-7 An automated laboratory waste liquid sorting and recycling device is shown, comprising:

[0034] The double-layer platform 100 includes a horizontally arranged upper platform 101, a lower platform 102, and four vertical support legs 103 connecting the two. A circular slot 1011 is opened in the center of the upper platform 101.

[0035] Waste liquid receiving tank 200 is fixed to the lower surface of the upper platform 101, and extends downward at the bottom to form a funnel-shaped waste liquid collecting tank 201. At least three detection holes 202 are equally spaced on the circumferential sidewall of the waste liquid collecting tank 201, and each detection hole is embedded with a waterproof sealing ring. The detection unit 300 includes a conductivity sensor 301, a pH sensor 302 and a VOC sensor 303, and each sensor probe extends into the inner cavity of the collecting tank 201 through the sealing ring.

[0036] The main solenoid valve 400 is vertically installed at the outlet directly below the waste liquid collection tank 201, with the valve body coaxially aligned with the collection tank 201; the six-way distributor 500 has a main interface 501 at the top connected to the outlet of the main solenoid valve 400, and six branch interfaces 502 distributed at equal angles at the bottom.

[0037] Six solenoid valves 600 have their inlets connected to the six branch interfaces 502 of a six-way liquid distributor 500, and their outlets are connected to the corresponding waste liquid tanks 700 via corrosion-resistant hoses 800. The waste liquid tanks are classified into six types: organic acidic, organic neutral, organic alkaline, inorganic acidic, inorganic neutral, and inorganic alkaline.

[0038] The intelligent controller 900 is electrically connected to the conductivity sensor 301, pH sensor 302, VOC sensor 303, main solenoid valve 400 and six branch solenoid valves 600 via shielded cables. It receives signals from the detection unit in real time and controls the on / off state of the main solenoid valve 400 and the six branch solenoid valves 600 respectively.

[0039] The working principle of the automatic waste liquid sorting and recycling device in this laboratory is as follows:

[0040] The waste liquid first enters the waste liquid receiving tank through a circular inlet on the upper platform, forming a stable liquid level in the funnel-shaped collection tank. At this time, conductivity, pH, and VOC sensors installed on the side wall of the collection tank simultaneously activate to detect and measure the ion concentration, acidity / alkalinity, and volatile organic compound content of the waste liquid, respectively. These detection data are transmitted to the intelligent controller in real time for analysis and processing.

[0041] This device uses a three-level judgment logic to accurately classify six types of waste liquids through the coordinated detection of conductivity, pH, and VOC sensors:

[0042] The first level of judgment (conductivity detection): The conductivity sensor first distinguishes between organic and inorganic waste liquids. When the detected conductivity is below 200 μS / cm, it is determined to be organic waste liquid; when the conductivity reaches or exceeds 500 μS / cm, it is determined to be inorganic waste liquid. This judgment is based on the characteristic that organic compounds generally have poor conductivity, while inorganic acid, alkali, and salt solutions have high conductivity.

[0043] The second level of judgment (VOC verification): For the ambiguous region of conductivity between 200-500 μS / cm, the VOC sensor plays a crucial verification role. When the detected VOC concentration exceeds 50 ppm, it is judged as organic waste liquid even if the conductivity is high; otherwise, it is judged as inorganic waste liquid. This design effectively solves the problem of misjudgment for some highly conductive organic solvents (such as saline organic solutions).

[0044] Third-level judgment (pH sub-classification): After determining the organic / inorganic category, the pH sensor performs the final classification: Organic waste liquid sub-classification:

[0045] pH < 3: Organic acidic waste liquid (such as waste liquid containing organic acids or acidic organic solvents)

[0046] pH ≤ 11: Neutral organic waste liquid (such as pure organic solvents or neutral organic matter)

[0047] pH > 11: Organic alkaline waste liquid (such as waste liquid containing organic alkali)

[0048] Inorganic waste liquid classification:

[0049] pH < 3: Inorganic acidic waste liquid (such as strong acid solution)

[0050] pH ≤ 11: Inorganic neutral waste liquid (such as salt solution)

[0051] pH > 11: Inorganic alkaline waste liquid (such as strong alkaline solutions)

[0052] The judgment logic also incorporates multiple safeguards:

[0053] Data cross-validation: When the conductivity and VOC detection results contradict each other, the system automatically initiates the retest procedure.

[0054] Buffer delay design: Sensor data must be held stably for 2 seconds before the classification instruction is triggered.

[0055] Abnormal Handling: Unidentified waste liquid is automatically diverted to an emergency collection tank.

[0056] This three-level judgment system not only ensures classification accuracy (actual accuracy rate > 98%), but also adapts to the complex and ever-changing characteristics of waste liquid in the laboratory, and has significant advantages over single-parameter detection methods.

[0057] After sorting, the system first opens the main solenoid valve, followed by a delayed opening of the corresponding branch solenoid valves. Under gravity, the waste liquid flows through a six-way distributor, through angled branch interfaces at specific angles and corrosion-resistant hoses, and finally into the appropriate waste liquid storage tank. The entire sorting process is sequentially controlled to ensure the accuracy of the waste liquid flow direction.

[0058] After the work is completed, the system executes an automatic reset procedure. First, the branch solenoid valves are closed, then the main solenoid valve is closed after a delay, and finally the cleaning system is activated to spray and clean the waste liquid receiving tank. All operations are completed automatically in a closed environment, effectively avoiding the dangers of manual operation and the risk of cross-contamination. The system also has periodic self-testing and calibration functions to ensure continuous and stable operating performance.

[0059] In another preferred embodiment, the detection unit 300 further includes an oxidation-reduction potential sensor 304, whose probe extends through a sealing ring into the inner cavity of the collection tank 201. The oxidation-reduction potential (ORP) sensor 304 plays a crucial role in safety monitoring and waste liquid characteristic identification in this device. By measuring the oxidation-reduction potential (in mV) of the waste liquid, this sensor can accurately determine the activity intensity of oxidizing or reducing substances present in the waste liquid. The potential difference generated by the electron exchange reaction on its platinum electrode surface, after benchmark comparison with an Ag / AgCl reference electrode, can detect potential changes in the range of -1500mV to +1500mV, with a measurement accuracy of ±10mV. When an ORP value > +800mV is detected, it indicates the presence of strong oxidizing substances (such as concentrated nitric acid, chromic acid, etc.), and the system will automatically classify it into a dedicated collection container and trigger the cooling system; when the ORP value < -500mV, it indicates the presence of strong reducing substances (such as sodium sulfide, sulfite, etc.), and inert gas protection measures will be activated. This sensor can also identify potential hazardous chemical reaction risks. When it detects a drastic fluctuation in the ORP value within a short period (Δ > 200 mV / s), it will immediately cut off the waste liquid pathway and initiate an emergency treatment procedure. The sensor probe is protected by a perfluorosulfonic acid ion exchange membrane (Nafion membrane), which ensures a fast measurement response time (< 5 seconds) and effectively prevents organic matter from contaminating the electrode. Combined with the controller's built-in ORP-pH correlation algorithm, it significantly improves the accuracy of identifying special waste liquids containing heavy metals, cyanides, and other contaminants.

[0060] In another preferred embodiment, the tip of each sensor probe is 1-5 mm from the bottom of the waste liquid collection tank 201. By limiting the distance between the sensor tip and the bottom of the tank to 1-5 mm, stable readings can be obtained under various flow conditions. If the distance is too close, it is easily affected by sediment, and if the distance is too far, small flow rates of waste liquid may not be able to contact the probe. This optimized design significantly improves the detection accuracy.

[0061] In another preferred embodiment, the waste liquid receiving tank 200 has an upper opening diameter larger than the diameter of the circular slot 1011 opened at the center of the upper platform 101; an annular spray pipe 1000 is concealed and fixed on the lower surface of the upper platform 101 outside the circular slot 1011, and a ring of spray holes 1001 are evenly opened on the annular spray pipe 1000. The spray direction of the spray holes 1001 is inclined at 45° towards the inner wall of the waste liquid receiving tank 200. The annular spray pipe 1000 is connected to a tap water pipeline through a high-pressure water pump 1002. The core function of the annular spray pipe 1000 is to realize the automated cleaning of the waste liquid receiving tank 200. After the waste liquid is discharged, the high-pressure water pump 1002 is started (working pressure 0.3~0.5MPa), and high-pressure water is sprayed through the evenly distributed spray holes 1001. The spray nozzles are angled at 45° towards the inner wall of the tank, creating a spiral rinsing flow that effectively removes residual waste liquid and sediment. Actual measurements show that a single rinse (lasting 5-8 seconds) removes 99.7% of the residue, preventing cross-contamination between different batches of waste liquid. The spray pipes are embedded in an annular groove on the lower surface of the upper platform 101, with only the nozzles protruding slightly by 0.5mm, protecting the pipes from corrosion and preventing exposed parts from interfering with operation.

[0062] In another preferred embodiment, the branch interface 502 at the bottom of the six-way distributor 500 is inclined downwards at an angle of 15°-25° to the vertical direction. This 15°-25° inclination angle design maintains the waste liquid at an optimal flow rate of 0.2-0.5 m / s, preventing droplet adhesion to the wall and avoiding excessive turbulence. Combined with the subsequent plugging adjustment structure, the residual amount can be controlled below 0.05 mL.

[0063] In another preferred embodiment, the six-way distributor 500 has an internally threaded hole at its bottom, and a plug 503 is screwed into the threaded hole. The end of the plug 503 is a ball head, and the residual liquid volume is adjusted by adjusting the depth to which the plug 503 is screwed in. Users can flexibly control the residual liquid volume in the branch pipe according to the viscosity characteristics of the waste liquid. The ball head design ensures a reliable line contact seal with the pipe wall.

[0064] In another preferred embodiment, the organic acidic waste liquid tank is a stainless steel tank lined with polytetrafluoroethylene (PTFE), the organic neutral waste liquid tank and the inorganic neutral waste liquid tank are stainless steel tanks without linings, the organic alkaline waste liquid tank is a high-density polyethylene (HDPE) tank, the inorganic acidic waste liquid tank is a quartz glass tank, and the inorganic alkaline waste liquid tank is a nylon 66 reinforced tank. Special materials are selected for different types of waste liquids; for example, PTFE lining resists organic acid corrosion, quartz glass is resistant to hydrofluoric acid, and nylon 66 resists strong alkali corrosion. All materials have been verified through a 168-hour immersion test to ensure long-term reliability.

[0065] In another preferred embodiment, the waste liquid tank 700 is equipped with a weighing sensor at the bottom, a liquid level alarm on the side wall, and a one-way valve cover at the top. This integrated triple monitoring system, comprising a weighing sensor, a photoelectric liquid level alarm, and a one-way valve cover, can monitor the waste liquid level in real time and prevent VOCs from escaping. The data is transmitted to a monitoring terminal via a wireless module, enabling remote intelligent management.

[0066] In another preferred embodiment, the intelligent controller 900 includes an STM32F407 microprocessor and a six-channel relay array. The microprocessor communicates with each sensor via the Modbus protocol, and the output of the relay array is connected to each solenoid valve via an opto-isolation circuit. The design, employing an industrial-grade STM32F407 main controller combined with opto-isolation and Modbus communication, allows for stable operation in environments with strong electromagnetic interference, supports a long-distance communication distance of 1200m, and meets the needs of various laboratory environments.

[0067] In another preferred embodiment, the branch solenoid valve 600 is a normally closed two-position two-way solenoid valve with a PTFE sealing surface for the valve core. The valve body is connected to the branch interface 502 of the six-way distributor 500 via a quick-release clamp. The 304 stainless steel self-tightening clamp design enables quick disassembly and assembly with one hand, allowing valve replacement to be completed within 30 seconds. This is 5 times more efficient than traditional flange connections, significantly simplifying the maintenance process.

[0068] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. An automatic sorting and recycling device for laboratory waste liquid, characterized in that, include: The double-layer platform (100) includes a horizontally arranged upper platform (101), a lower platform (102) and four vertical support legs (103) connecting the two. A circular slot (1011) is opened in the center of the upper platform (101). Waste liquid receiving tank (200) is fixed to the lower surface of the upper platform (101), and the bottom extends downward to form a funnel-shaped waste liquid collection tank (201). At least three detection holes (202) are opened at equal intervals on the circumferential sidewall of the waste liquid collection tank (201), and each detection hole is embedded with a waterproof sealing ring. The detection unit (300) includes a conductivity sensor (301), a pH sensor (302) and a VOC sensor (303), with each sensor probe extending into the inner cavity of the collecting groove (201) through a sealing ring; The main solenoid valve (400) is vertically installed at the outlet directly below the waste liquid collection tank (201), with the valve body coaxially aligned with the collection tank (201); The six-way distributor (500) has a main interface (501) at the top connected to the outlet of the main solenoid valve (400), and six branch interfaces (502) distributed at equal angles at the bottom. Six solenoid valves (600) are connected to the six branch interfaces (502) of a six-way distributor (500) at their inlets, and to the corresponding waste liquid tanks (700) at their outlets via corrosion-resistant hoses (800). The waste liquid tanks are classified into six types: organic acidic, organic neutral, organic alkaline, inorganic acidic, inorganic neutral, and inorganic alkaline. The intelligent controller (900) is electrically connected to the conductivity sensor (301), pH sensor (302), VOC sensor (303), main solenoid valve (400) and six branch solenoid valves (600) via shielded cables. It receives signals from the detection unit in real time and controls the opening and closing of the main solenoid valve (400) and the six branch solenoid valves (600) respectively.

2. The automatic laboratory waste liquid sorting and recycling device according to claim 1, characterized in that, The detection unit (300) also includes a redox potential sensor (304), whose probe extends through the sealing ring into the cavity of the converging groove (201).

3. The automatic laboratory waste liquid sorting and recycling device according to claim 1 or 2, characterized in that, The end of each sensor probe is 1-5 mm away from the bottom of the waste liquid collection tank (201).

4. The automatic laboratory waste liquid sorting and recycling device according to claim 1, characterized in that, The diameter of the upper opening of the waste liquid receiving tank (200) is larger than the diameter of the circular slot (1011) opened in the center of the upper platform (101); a ring spray pipe (1000) is concealed and fixed on the lower surface of the upper platform (101) outside the circular slot (1011). A ring of spray holes (1001) is evenly opened on the ring spray pipe (1000). The spray direction of the spray holes (1001) is inclined at 45° towards the inner wall of the waste liquid receiving tank (200). The ring spray pipe (1000) is connected to the tap water pipeline through a high-pressure water pump (1002).

5. The automatic laboratory waste liquid sorting and recycling device according to claim 1, characterized in that, The branch interface (502) at the bottom of the six-way distributor (500) is inclined downward at an angle of 15°-25° to the vertical direction.

6. The automatic laboratory waste liquid sorting and recycling device according to claim 1, characterized in that, The bottom of the six-way distributor (500) has an internal threaded hole, and a plug (503) is screwed into the threaded hole. The end of the plug (503) is a ball head. The residual liquid volume is adjusted by adjusting the depth of the plug (503) screwed in.

7. The automatic laboratory waste liquid sorting and recycling device according to claim 1, characterized in that, Organic acidic waste liquid tanks are stainless steel tanks lined with polytetrafluoroethylene; organic neutral waste liquid tanks and inorganic neutral waste liquid tanks are stainless steel tanks without linings; organic alkaline waste liquid tanks are high-density polyethylene tanks; inorganic acidic waste liquid tanks are quartz glass tanks; and inorganic alkaline waste liquid tanks are nylon 66 reinforced tanks.

8. The automatic laboratory waste liquid sorting and recycling device according to claim 1, characterized in that, The waste liquid tank (700) is equipped with a weighing sensor at the bottom, a liquid level alarm on the side wall, and a one-way valve cover on the top.

9. The automatic laboratory waste liquid sorting and recycling device according to claim 1, characterized in that, The intelligent controller (900) includes an STM32F407 microprocessor and a six-channel relay array. The microprocessor communicates with each sensor via the Modbus protocol, and the output of the relay array is connected to each solenoid valve via an opto-isolation circuit.

10. The automatic laboratory waste liquid sorting and recycling device according to claim 1, characterized in that, The branch solenoid valve (600) is a normally closed two-position two-way solenoid valve. The valve core is made of polytetrafluoroethylene sealing surface. The valve body is connected to the branch interface (502) of the six-way distributor (500) by a quick-release clamp.

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