Laboratory accident wastewater pretreatment device

Abstract

The utility model relates to the field of laboratory accident wastewater treatment, in particular to a laboratory accident wastewater pretreatment device which comprises an impurity removal mechanism, one end of a first PH (potential of hydrogen) adjusting tank is connected with a water inlet pipe for water coming from an accident lifting pump, and a first through hole for communicating the first PH adjusting tank with a Fenton reaction tank is formed in one end, far away from the water inlet pipe, of the first PH adjusting tank; a second through hole for communicating the Fenton reaction tank with the second PH adjusting tank is formed in one end, far away from the first PH adjusting tank, of the Fenton reaction tank, a third through hole for communicating the second PH adjusting tank with the coagulation tank is formed in one end, far away from the Fenton reaction tank, of the second PH adjusting tank, and a fourth through hole for communicating the coagulation tank with the flocculation tank is formed in one end, far away from the second PH adjusting tank, of the coagulation tank; feeding boxes are mounted in the first PH adjusting tank, the Fenton reaction tank, the second PH adjusting tank, the coagulating tank and the flocculating tank. The device can effectively remove impurities in accident wastewater.

Description

Technical Field

[0001] This utility model relates to the field of laboratory accident wastewater treatment, specifically to a laboratory accident wastewater pretreatment device. Background Technology

[0002] Statistics show that university chemistry labs generate several hundred to several thousand tons of wastewater annually, while regular high schools generate approximately several hundred tons. For the wastewater generated by university and high school chemistry labs in my country, the vast majority of high-concentration wastewater requires recycling and treatment, while low-concentration cleaning wastewater needs to be treated to meet discharge standards. Lab wastewater mainly consists of heavy metals, organic wastewater, waste acids, and alkalis. Wastewater treatment plants are generally designed with low-concentration cleaning wastewater as the influent water quality. Therefore, if high-concentration wastewater that should be recycled is accidentally discharged into a wastewater treatment plant, the influent concentration will inevitably exceed the design value, leading to insufficient wastewater treatment capacity and potentially causing environmental pollution incidents.

[0003] Therefore, the present invention aims to provide a laboratory accident wastewater pretreatment device with rapid reaction and high removal rate. Utility Model Content

[0004] To address the aforementioned problems, a laboratory accident wastewater pretreatment device is provided. By incorporating a purification mechanism, which includes a first pH adjustment tank, a Fenton reaction tank, a second pH adjustment tank, a coagulation tank, and a flocculation tank, these tanks are connected in sequence and remove heavy metals, organic wastewater, waste acid, alkali, and other impurities from the experimental wastewater through a series of reactions. This solves the problem of environmental pollution accidents caused by insufficient wastewater treatment capacity.

[0005] To address the problems of existing technologies, this utility model provides a laboratory accident wastewater pretreatment device, including a purification mechanism. The purification mechanism comprises a first pH adjustment tank, a Fenton reaction tank, a second pH adjustment tank, a coagulation tank, and a flocculation tank. One end of the first pH adjustment tank is connected to an inlet pipe for water supplied by an emergency booster pump. The end of the first pH adjustment tank away from the inlet pipe has a first through-hole connecting the first pH adjustment tank and the Fenton reaction tank. The end of the Fenton reaction tank away from the first pH adjustment tank has a second through-hole connecting the Fenton reaction tank and the second pH adjustment tank. The end of the second pH adjustment tank away from the Fenton reaction tank has a third through-hole connecting the second pH adjustment tank and the coagulation tank. The end of the coagulation tank away from the second pH adjustment tank has a fourth through-hole connecting the coagulation tank and the flocculation tank. Feeding boxes are installed in the first pH adjustment tank, the Fenton reaction tank, the second pH adjustment tank, the coagulation tank, and the flocculation tank.

[0006] Preferably, the first pH adjustment tank, Fenton reaction tank, second pH adjustment tank, coagulation tank, and flocculation tank are all equipped with stirring mechanisms; the upper end of the first pH adjustment tank, Fenton reaction tank, second pH adjustment tank, coagulation tank, and flocculation tank is provided with an installation socket, and the upper end of the installation socket has an installation slot; a placement platform is inserted into the installation socket, and an installation block is provided below the placement platform. When the placement platform is inserted into the installation socket, the installation block is inserted into the installation slot; a motor is provided on the placement platform, and a through hole is provided at the center of the placement platform. The output shaft of the motor is connected to a stirring rod, and the stirring rod passes through the through hole into the placement platform.

[0007] Preferably, the mounting socket and the mounting block are provided with threaded holes. When the platform is inserted into the mounting socket, the threaded holes on the mounting block and the threaded holes on the mounting socket are positioned correspondingly. At this time, the platform and the mounting socket are fastened together by screwing in bolts.

[0008] Preferably, a sedimentation tank is provided at one end of the impurity removal mechanism; an outlet pipe is provided at the end of the flocculation tank away from the coagulation tank, and an inlet pipe is provided at one end of the sedimentation tank, with the outlet pipe and the inlet pipe connected by a connecting pipe; the sedimentation tank includes a water distribution tank, an inclined plate, and a sludge receiving tank; the inlet pipe is connected to the water distribution tank, and a plurality of water distribution holes are evenly provided at the bottom of the side wall of the water distribution tank; the inclined plate is provided at the end of the sedimentation tank away from the water distribution tank, and the inclined plate abuts against the end of the water distribution tank with the water distribution holes; the sludge receiving tank is located below the inclined plate in the sedimentation tank, and a discharge pipe is provided at the top of the side wall of the sludge receiving tank away from the water distribution tank.

[0009] Preferably, the sidewalls of the sludge receiving tank are inclined.

[0010] Preferably, a sludge discharge pipe is provided at the bottom of the sedimentation tank.

[0011] Preferably, the outer wall of the impurity removal mechanism is provided with a first connecting seat, and the outer wall of the sedimentation tank is provided with a second connecting seat. The second connecting seat has a slot that matches the shape of the first connecting seat. When the impurity removal mechanism is securely connected to the sedimentation tank, the first connecting seat is inserted into the slot of the second connecting seat. The first and second connecting seats have fixed slots. When the first and second connecting seats are inserted, the fixed slots on them overlap. A fixed rod is inserted into the fixed slot.

[0012] Preferably, a limiting block is provided inside the fixing slot of the first connecting seat; a limiting groove is formed on the circumferential surface of the fixing rod.

[0013] The advantages of this utility model compared to the prior art are:

[0014] 1. In this utility model, the sequential treatment of the wastewater by the first pH adjustment tank, the Fenton reaction tank, the second pH adjustment tank, the coagulation tank and the flocculation tank effectively removes pollutants such as organic matter and suspended solids, significantly improves water quality, meets the influent requirements of subsequent treatment processes, and effectively avoids environmental pollution accidents caused by the direct discharge of wastewater into the sewage treatment plant.

[0015] 2. In this utility model, a stirring mechanism is installed in each treatment tank. The stirring rod, driven by a motor, rotates in the wastewater, accelerating the mixing of wastewater and treatment agents, improving the uniformity and efficiency of the chemical reaction, thereby enhancing the effect and efficiency of wastewater treatment. Simultaneously, the platform for placing the stirring mechanism is connected to the mounting socket via mounting blocks and secured with bolts, ensuring the stability and reliability of the stirring mechanism and facilitating installation and disassembly.

[0016] 3. This utility model includes a sedimentation tank to further sedimentate the treated wastewater, effectively removing suspended particles and colloidal substances and further improving water quality. Attached Figure Description

[0017] Figure 1 This is a three-dimensional schematic diagram of a laboratory accident wastewater pretreatment device according to the present invention.

[0018] Figure 2 This is an exploded view of the impurity removal mechanism and sedimentation tank of a laboratory accident wastewater pretreatment device according to this utility model.

[0019] Figure 3 yes Figure 2 Enlarged view of a portion of point A in the middle.

[0020] Figure 4 yes Figure 2 Enlarged view of section B in the middle.

[0021] Figure 5 This is a three-dimensional schematic diagram of the sedimentation tank of a laboratory accident wastewater pretreatment device according to this utility model.

[0022] Figure 6 This is a partial sectional view of the sedimentation tank of a laboratory accident wastewater pretreatment device according to this utility model.

[0023] Figure 7 This is a three-dimensional schematic diagram of the first connecting seat and the second connecting seat of a laboratory accident wastewater pretreatment device according to this utility model.

[0024] Figure 8 This is a schematic diagram of a laboratory accident wastewater pretreatment device according to the present invention.

[0025] The diagram is labeled as follows: 1. Impurity removal mechanism; 11. First pH adjustment tank; 12. Fenton reaction tank; 13. Second pH adjustment tank; 14. Coagulation tank; 15. Flocculation tank; 2. Agitation mechanism; 21. Installation socket; 22. Placement platform; 23. Motor; 24. Agitator rod; 3. Sedimentation tank; 31. Water distribution tank; 32. Inclined plate; 33. Sludge collection tank; 34. Sludge discharge pipe; 4. First connecting seat; 41. Limiting block; 5. Second connecting seat; 6. Fixed insertion rod; 61. Limiting groove. Detailed Implementation

[0026] To further understand the features, technical means, and specific objectives and functions achieved by this utility model, the following detailed description of this utility model is provided in conjunction with the accompanying drawings and specific embodiments.

[0027] Reference Figures 1-8 As shown: A laboratory accident wastewater pretreatment device includes a purification mechanism 1, which comprises a first pH adjustment tank 11, a Fenton reaction tank 12, a second pH adjustment tank 13, a coagulation tank 14, and a flocculation tank 15. One end of the first pH adjustment tank 11 is connected to an inlet pipe for water supplied by an emergency booster pump. The end of the first pH adjustment tank 11 away from the inlet pipe has a first through hole connecting the first pH adjustment tank 11 to the Fenton reaction tank 12. The Fenton reaction tank 12 is located away from the first pH adjustment tank 11. One end of the first pH adjustment tank 11 is provided with a second through hole connecting the Fenton reaction tank 12 and the second pH adjustment tank 13. The end of the second pH adjustment tank 13 away from the Fenton reaction tank 12 is provided with a third through hole connecting the second pH adjustment tank 13 and the coagulation tank 14. The end of the coagulation tank 14 away from the second pH adjustment tank 13 is provided with a fourth through hole connecting the coagulation tank 14 and the flocculation tank 15. Feed boxes are installed in the first pH adjustment tank 11, the Fenton reaction tank 12, the second pH adjustment tank 13, the coagulation tank 14 and the flocculation tank 15.

[0028] Statistics show that university chemistry labs generate several hundred to several thousand tons of wastewater annually, while ordinary high schools generate approximately several hundred tons. If high-concentration wastewater that should be recycled is accidentally discharged into a wastewater treatment plant, the influent concentration will inevitably exceed the design value, leading to insufficient wastewater treatment capacity and potentially causing environmental pollution incidents. To address this problem, a laboratory accident wastewater pretreatment device is provided, the working principle of which is as follows:

[0029] The wastewater from the accident is first pumped in by a booster pump and enters the first pH adjustment tank 11 through the inlet pipe. In the first pH adjustment tank 11, acidic substances are added through a feeding box to adjust the pH value of the wastewater to between 2.0 and 3.0, to suit the subsequent advanced oxidation reaction conditions. After pH adjustment, the wastewater flows into the Fenton reactor 12 through the first through-hole between the first pH adjustment tank 11 and the Fenton reactor 12.

[0030] In Fenton reactor 12, ferrous ions and hydrogen peroxide are added via a feed box to initiate the Fenton reaction, which breaks down the structure of complex organic compounds such as alcohols and aromatics in the wastewater and reduces the chemical oxygen demand (COD). During the reaction, ferrous ions act as a catalyst, and hydrogen peroxide acts as an oxidant, working together to decompose the organic matter in the wastewater into smaller molecules or inorganic substances. The dosage is automatically controlled by an ORP meter to ensure the reaction proceeds under optimal conditions.

[0031] After treatment in Fenton reactor 12, the wastewater enters the second pH adjustment tank 13 through the third through-hole. In the second pH adjustment tank 13, alkaline substances are added via a feed box to adjust the pH of the wastewater to between 8.5 and 9.5, creating suitable conditions for subsequent coagulation and flocculation processes. Similarly, the dosage is automatically controlled by a pH meter to ensure accurate pH adjustment.

[0032] After adjusting the pH value, the wastewater enters coagulation tank 14. In coagulation tank 14, coagulants such as PAC (polyaluminum chloride) are added through the feeding box, causing the fine particles in the wastewater to coagulate into larger particles. This process helps improve the efficiency of subsequent flocculation and sedimentation.

[0033] Finally, the wastewater enters flocculation tank 15. In flocculation tank 15, flocculants such as PAM (polyacrylamide) are added through a feeding box to further enhance the agglomeration effect of the particles and form stable floc-like particles. These particles are more easily separated and removed during subsequent sedimentation.

[0034] Through the above treatment steps, pollutants such as organic matter and suspended solids in the accident wastewater are effectively removed, and the water quality is significantly improved, thereby meeting the influent requirements of subsequent treatment processes.

[0035] Reference Figures 1-7As shown: A stirring mechanism 2 is provided in the first pH adjustment tank 11, the Fenton reaction tank 12, the second pH adjustment tank 13, the coagulation tank 14, and the flocculation tank 15; an installation socket 21 is provided at the upper end of the first pH adjustment tank 11, the Fenton reaction tank 12, the second pH adjustment tank 13, the coagulation tank 14, and the flocculation tank 15, and an installation slot is provided at the upper end of the installation socket 21; a placement platform 22 is inserted into the installation socket 21, and an installation block is provided below the placement platform 22. When the placement platform 22 is inserted into the installation socket 21, the installation block is inserted into the installation slot; a motor 23 is provided on the placement platform 22, and a through hole is provided at the center of the placement platform 22. The output shaft of the motor 23 is connected to a stirring rod 24, and the stirring rod 24 passes through the through hole and through the placement platform 22.

[0036] The first pH adjustment tank 11, the Fenton reaction tank 12, the second pH adjustment tank 13, the coagulation tank 14, and the flocculation tank 15 are all equipped with a stirring mechanism 2. The stirring mechanism 2 is driven by a motor 23 to ensure that the chemical reaction in the tank can proceed uniformly and efficiently. When wastewater enters these treatment tanks, the stirring mechanism 2 starts to work. Through the rotation of the stirring rod 24 in the wastewater, it accelerates the mixing of wastewater and treatment agents, thereby improving treatment efficiency.

[0037] Reference Figures 1-4 As shown: The mounting socket 21 and the mounting block are provided with threaded holes. When the platform 22 is inserted into the mounting socket 21, the threaded holes on the mounting block and the threaded holes on the mounting socket 21 are aligned. At this time, the platform 22 and the mounting socket 21 are fastened together by screwing in bolts.

[0038] When the placement platform 22 needs to be installed onto the treatment tank, the operator first aligns the mounting block of the placement platform 22 with the mounting socket 21 and slowly inserts it. As the placement platform 22 is inserted, the threaded holes on the mounting block gradually align with the threaded holes on the mounting socket 21. Once fully aligned, the operator can use bolts to screw the placement platform 22 tightly onto the mounting socket 21.

[0039] Reference Figures 5-8As shown: a sedimentation tank 3 is provided at one end of the impurity removal mechanism 1; an outlet pipe is provided at the end of the flocculation tank 15 away from the coagulation tank 14, and an inlet pipe is provided at one end of the sedimentation tank 3. The outlet pipe and the inlet pipe are connected by a connecting pipe; the sedimentation tank 3 includes a water distribution tank 31, an inclined plate 32, and a sludge receiving tank 33; the inlet pipe is connected to the water distribution tank 31, and several water distribution holes are evenly opened at the bottom of the side wall of the water distribution tank 31; the inclined plate 32 is located at the end of the sedimentation tank 3 away from the water distribution tank 31, and the inclined plate 32 is abutted against the end of the water distribution tank 31 where the water distribution holes are opened; the sludge receiving tank 33 is located below the inclined plate 32 inside the sedimentation tank 3, and a discharge pipe is provided at the top of the side wall of the sludge receiving tank 33 away from the water distribution tank 31.

[0040] Wastewater containing sediment first enters the distribution tank 31 inside the sedimentation tank 3 through the feed pipe, and then flows evenly into the sludge receiving tank 33 through several evenly distributed distribution holes on the bottom side wall of the distribution tank 31, obstructed by the inclined plate 32. Larger impurities gradually accumulate in the sludge receiving tank 33, while the clearer wastewater surges upward. Since the inclined plate 32 is set above the sludge receiving tank, the wastewater will be filtered again by the inclined plate 32, thus obtaining wastewater that meets the requirements.

[0041] Reference Figures 5-8 As shown: the sidewall of the sludge tank 33 is inclined.

[0042] Under the guidance of the inclined sidewall of the sludge receiving tank 33, the sediment is more likely to accumulate at the bottom of the sedimentation tank 3.

[0043] Reference Figure 5 As shown: The sedimentation tank 3 is equipped with a sludge discharge pipe 34 at the bottom.

[0044] When wastewater enters sedimentation tank 3, the suspended particles, colloidal substances, and flocs formed by coagulation and flocculation gradually settle to the bottom of the tank due to the slowed water flow. This forms a sludge layer, which can be discharged from the bottom of sedimentation tank 3 periodically or as needed through sludge discharge pipe 34.

[0045] Reference Figures 1-7 As shown: The outer wall of the impurity removal mechanism 1 is provided with a first connecting seat 4, and the outer wall of the sedimentation tank 3 is provided with a second connecting seat 5. The second connecting seat 5 has a slot that matches the shape of the first connecting seat 4. When the impurity removal mechanism 1 is securely connected to the sedimentation tank 3, the first connecting seat 4 is inserted into the slot of the second connecting seat 5. The first connecting seat 4 and the second connecting seat 5 have fixed slots. When the first connecting seat 4 and the second connecting seat 5 are inserted, the fixed slots on them coincide. A fixed rod 6 is inserted into the fixed slot.

[0046] When it is necessary to connect the sedimentation tank 3 to the impurity removal mechanism 1, the operator simply needs to accurately insert the first connecting seat 4 into the slot of the second connecting seat 5, so that the two can be tightly connected. For further fixation, the fixing rod 6 is inserted into the fixing slot, which can more firmly connect the impurity removal mechanism 1 and the sedimentation tank 3, thereby ensuring the stability and safety of the entire pretreatment device during operation.

[0047] Reference Figures 1-7 As shown: a limiting block 41 is provided inside the fixing slot of the first connecting seat 4; a limiting groove 61 is provided on the circumferential surface of the fixing rod 6.

[0048] The fixed insertion rod 6 is provided with a clearance area that is offset from the limiting block 41. The fixed insertion rod 6 can be smoothly inserted into the fixed slot through the clearance area. The limiting groove 61 is opened at the top of the clearance area. By rotating the fixed insertion rod 6, the limiting block 41 slides into the limiting groove 61, effectively preventing the fixed insertion rod 6 from coming out of the fixed slot.

[0049] The impurity removal unit 1 includes a first pH adjustment tank 11, a Fenton reaction tank 12, a second pH adjustment tank 13, a coagulation tank 14, and a flocculation tank 15. Wastewater is first drawn in by an emergency booster pump and enters the first pH adjustment tank 11 through an inlet pipe. An acidic substance is added through a feed box, adjusting the pH of the wastewater to a range suitable for the Fenton reaction. Subsequently, the wastewater flows into the Fenton reaction tank 12, where ferrous ions and hydrogen peroxide are added to initiate the Fenton reaction, breaking down the organic matter structure in the wastewater and reducing the chemical oxygen demand (COD).

[0050] After treatment by the Fenton reaction, the wastewater enters the second pH adjustment tank 13, where alkaline substances are added to adjust the pH to a suitable range for coagulation and flocculation. Next, the wastewater enters the coagulation tank 14, where coagulants such as PAC are added to coagulate fine particles into larger particles. Finally, the wastewater enters the flocculation tank 15, where flocculants such as PAM are added to further enhance the coagulation effect, forming stable floc-like particles.

[0051] To ensure uniform and efficient chemical reactions within each tank, a stirring mechanism 2 is installed in each tank. Driven by a motor 23, the stirring rod 24 rotates within the wastewater, accelerating the mixing of the wastewater and treatment agents and improving treatment efficiency. The platform 22 of the stirring mechanism 2 is connected to the mounting socket 21 via mounting blocks and secured with bolts, ensuring the stability and reliability of the stirring mechanism 2.

[0052] The treated wastewater flows out of the flocculation tank 15 through the effluent pipe, enters the sedimentation tank 3 through the connecting pipe and the feed pipe, and finally, the water treated by sedimentation is discharged from the pretreatment device in an orderly manner through the discharge pipe.

[0053] To securely connect the sedimentation tank 3 to the impurity removal mechanism 1, a first connecting seat 4 is provided on the outer wall of the impurity removal mechanism 1, and a second connecting seat 5 is provided on the outer wall of the sedimentation tank 3. The first connecting seat 4 can be inserted into the slot of the second connecting seat 5 to achieve a tight connection. For further fixation, fixing slots are also provided on the first connecting seat 4 and the second connecting seat 5, into which the fixing rod 6 can be inserted. The fixing rod 6 has a clearance area that is offset from the limiting block 41, allowing the fixing rod 6 to be smoothly inserted into the fixing slot. Then, by rotating the fixing rod 6, the limiting block 41 slides into the limiting groove 61, effectively preventing the fixing rod 6 from coming out of the fixing slot, thus ensuring the stability and safety of the connection between the impurity removal mechanism 1 and the sedimentation tank 3.

[0054] In summary, the laboratory accident wastewater pretreatment device achieves effective pretreatment of wastewater through the coordinated operation of its various components, providing a strong guarantee for subsequent treatment or discharge.

[0055] The above embodiments only illustrate one or more implementations of this utility model, and their descriptions are relatively specific and detailed, but they should not be construed as limiting the scope of this utility model. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this utility model, and these all fall within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the appended claims.

Claims

1. A laboratory accident wastewater pretreatment device comprising a decontamination mechanism (1), characterized in that, The impurity removal mechanism (1) comprises a first PH adjusting tank (11), a Fenton reaction tank (12), a second PH adjusting tank (13), a coagulation tank (14) and a flocculation tank (15); One end of the first PH adjusting tank (11) is connected with a water inlet pipe for accident wastewater, and the first PH adjusting tank (11) is provided with a first through hole at the end away from the water inlet pipe, which communicates the first PH adjusting tank (11) with the Fenton reaction tank (12); the Fenton reaction tank (12) is provided with a second through hole at the end away from the first PH adjusting tank (11), which communicates the Fenton reaction tank (12) with the second PH adjusting tank (13); the second PH adjusting tank (13) is provided with a third through hole at the end away from the Fenton reaction tank (12), which communicates the second PH adjusting tank (13) with the coagulation tank (14); and the coagulation tank (14) is provided with a fourth through hole at the end away from the second PH adjusting tank (13), which communicates the coagulation tank (14) with the flocculation tank (15). The first PH adjusting tank (11), the Fenton reaction tank (12), the second PH adjusting tank (13), the coagulation tank (14) and the flocculation tank (15) are all provided with a feeding box.

2. A laboratory accident wastewater pretreatment device according to claim 1, characterized in that The first PH adjusting tank (11), the Fenton reaction tank (12), the second PH adjusting tank (13), the coagulation tank (14) and the flocculation tank (15) are all provided with a stirring mechanism (2). The upper end of the first PH adjusting tank (11), the Fenton reaction tank (12), the second PH adjusting tank (13), the coagulation tank (14) and the flocculation tank (15) is provided with a mounting socket (21), and the upper end of the mounting socket (21) is provided with a mounting slot. The mounting socket (21) is inserted with a placement platform (22), and the placement platform (22) is provided with a mounting block below; when the placement platform (22) is inserted with the mounting socket (21), the mounting block is inserted into the mounting slot. The placement platform (22) is provided with a motor (23), and the center of the placement platform (22) is provided with a through hole; the output shaft of the motor (23) is connected with a stirring rod (24), and the stirring rod (24) passes through the placement platform (22) through the through hole.

3. A laboratory accident wastewater pretreatment device according to claim 2, characterized in that The mounting socket (21) and the mounting block are provided with threaded holes; when the placement platform (22) is inserted into the mounting socket (21), the threaded holes of the mounting block and the mounting socket (21) correspond in position; at this time, the placement platform (22) and the mounting socket (21) are fastened and connected by rotating the bolts into the threaded holes.

4. A laboratory accident wastewater pretreatment device according to claim 1, characterized in that, One end of the impurity removal mechanism (1) is provided with a sedimentation tank (3); The end of the flocculation tank (15) away from the coagulation tank (14) is provided with a water outlet pipe, and one end of the sedimentation tank (3) is provided with a feeding pipe; the water outlet pipe and the feeding pipe are communicated through a connecting pipeline. The sedimentation tank (3) comprises a water distribution tank (31), an inclined plate (32) and a pollution receiving groove (33). The feeding pipe is communicated with the water distribution tank (31), and a plurality of water distribution holes are uniformly arranged at the bottom of the side wall of the water distribution tank (31). The inclined plate (32) is arranged at one end of the sedimentation tank (3) far from the water distribution tank (31), and the inclined plate (32) is abutted against one end of the water distribution tank (31) provided with the water distribution hole. The pollution absorption groove (33) is located below the inclined plate (32) in the sedimentation tank (3). The pollution absorption groove (33) is provided with a discharge pipeline at the top of the side wall far from the water distribution tank (31).

5. A laboratory accident wastewater pretreatment device according to claim 4, characterized in that The side wall of the pollution absorption groove (33) is arranged in an inclined manner.

6. A laboratory accident wastewater pretreatment device according to claim 4, characterized in that The sedimentation tank (3) is provided with a sludge discharge pipe (34) at the bottom.

7. A laboratory accident wastewater pretreatment device according to claim 4, characterized in that The outer side wall of the impurity removal mechanism (1) is provided with a first connecting seat (4), the outer side wall of the sedimentation tank (3) is provided with a second connecting seat (5), and the second connecting seat (5) is provided with a slot matching the shape of the first connecting seat (4); When the impurity removal mechanism (1) is stably connected with the sedimentation tank (3), the first connecting seat (4) is inserted into the slot of the second connecting seat (5); The first connecting seat (4) and the second connecting seat (5) are provided with fixing slots; When the first connecting seat (4) and the second connecting seat (5) are inserted, the fixing slots on the first connecting seat (4) and the second connecting seat (5) are coincided; A fixing rod (6) is inserted into the fixing slot.

8. A laboratory accident wastewater pretreatment device according to claim 7, characterized in that The fixing slot of the first connecting seat (4) is provided with a limiting block (41) inside; The circumferential surface of the fixing rod (6) is provided with a limiting slot (61) matching the shape of the limiting block (41).

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