Device and method for detecting plasticizer for wastewater treatment

Abstract

The invention discloses a plasticizer detection device and method for wastewater treatment, and particularly relates to the field of plasticizer detection.The plasticizer detection device comprises a support, a heater and a flask are arranged on the support, the heater is used for heating extraction liquid contained in the flask, and a Soxhlet extractor is installed at the upper end of the flask; a condensation pipe is mounted at the upper end of the Soxhlet extractor; the Soxhlet extractor comprises a tube body, a tube bottom is arranged at the bottom of the tube body, a containing assembly is arranged in the tube body, the containing assembly comprises a test tube, and the test tube is used for containing a sample to be detected. According to the invention, the containing assembly is designed, a solid sample evaporated in the test tube is not transferred, an extraction liquid cooled into liquid drops flows into the test tube and is mixed with the solid sample to extract a plasticizer in the sample, and the plasticizer flows into the tube body by opening the bottom opening and finally flows into the flask to complete extraction. And calculating to obtain the content of the plasticizer.

Description

Technical Field

[0001] The present invention relates to the technical field of plasticizer detection, and more specifically, to a plasticizer detection device and method for wastewater treatment. Background Art

[0002] Plasticizers in industrial wastewater and surface sewage enter water bodies through industrial and agricultural emissions and surface runoff. Due to their high stability, they are enriched in organisms and eventually enter the human body through drinking water and contaminated food chains, posing a serious threat to ecosystems and human health.

[0003] Plasticizers refer to a class of substances that can improve the properties of polymers, such as phthalates, aliphatic dibasic acid esters, etc. They are insoluble in water but can be miscible with most organic solvents such as ethanol, ether, and mineral oil.

[0004] There are currently many methods for treating wastewater, such as physical, chemical, and biological methods. Each method has different abilities to treat pollutants in wastewater, and there are also significant differences in the efficiency of removing plasticizers.

[0005] Detecting the concentration of plasticizers in industrial wastewater after treatment has key guiding significance for the development of key technologies for risk diagnosis and control of wastewater pollutant treatment, optimizing treatment processes and promoting resource recycling. Therefore, it is necessary to detect the concentration of plasticizers in wastewater after treatment.

[0006] When testing the plasticizer content, solid samples are required, so the wastewater needs to be evaporated to obtain residual solids. The plasticizer does not volatilize and remains in the solid. When the wastewater in the test tube is completely evaporated, the residual solid sample will adhere to the tube wall. If forced to transfer, it will lead to sample loss, resulting in low test results. Summary of the Invention

[0007] The present invention provides a device and method for detecting plasticizers for wastewater treatment, aiming to solve the problem that, after the wastewater in a test tube completely evaporates, the residual solid sample will adhere to the tube wall. Forcible transfer will lead to sample loss, resulting in low test results.

[0008] To achieve the above-mentioned objectives, the present invention provides the following technical solutions: a plasticizer detection device for wastewater treatment, comprising a bracket, on which a heater and a flask are provided, the heater is used to heat the extract contained in the flask, a Soxhlet extractor is installed at the upper end of the flask, and a condenser is installed at the upper end of the Soxhlet extractor; the Soxhlet extractor comprises a tube body, the bottom of the tube body is provided with a tube bottom, a holding assembly is provided inside the tube body, the holding assembly comprises a test tube, the test tube is used to hold a sample to be tested, the bottom of the test tube has a bottom opening, a rod is inserted in the middle of the holding assembly, the bottom end of the rod is fixedly connected to a sealing plug, the sealing plug is inserted in the bottom opening to seal the bottom opening; a linear drive component is installed on the bracket, and the linear drive component is used to drive the rod to rise and fall.

[0009] In a preferred embodiment, the linear drive component includes motor 1, the output end of motor 1 is fixedly connected to a cam, the top end of the insertion rod extends upward to the top of the condenser and is installed with a disc, the cam is located below the disc and the cam is in contact with the bottom surface of the disc, and when motor 1 drives the cam to rotate, the cam pushes the disc upward.

[0010] In a preferred embodiment, the plasticizer detection device also includes a connecting assembly, which includes a lower fixed plate and an upper fixed plate, the lower fixed plate is fixedly installed on the upper end of the tube body, and the upper fixed plate is installed on the upper end of the test tube, and both ends of the upper fixed plate are fixedly installed with pins, which are movably inserted into the lower fixed plate.

[0011] In a preferred embodiment, the insertion rod is fixedly connected to a fixing block at the upper side of the test tube, a spring is sleeved on the insertion rod, and two ends of the spring are respectively pressed against the fixing block and the upper fixing plate.

[0012] In a preferred embodiment, the containing assembly also includes a movable sleeve mounted on the insertion rod, and stirring blades are fixedly connected to both ends of the lower side of the movable sleeve. The lower surface of the stirring blades can fit into the bottom of the inner side of the test tube, and the upper end of the movable sleeve is detachably connected to the lower surface of the fixed block.

[0013] In a preferred embodiment, the portion of the insertion rod below the fixed block is composed of an elliptical rod portion and a round rod portion from top to bottom, and the inner hole of the movable sleeve and the cross-section of the elliptical rod portion are both elliptical.

[0014] In a preferred embodiment, a second motor is mounted on the bracket, and the output wheel of the second motor is vertically movably connected to the upper end of the insertion rod. The second motor is used to drive the insertion rod to rotate, and the insertion rod can slide vertically relative to the output wheel of the second motor.

[0015] In a preferred embodiment, the Soxhlet extractor further comprises a steam pipe and a siphon pipe, wherein the steam pipe connects the bottom of the pipe with the upper end of the side of the pipe body, and the siphon pipe connects the bottom of the pipe body with the bottom of the pipe, and the siphon pipe bends upward.

[0016] The present invention also provides a method for detecting plasticizer content, using the above-mentioned plasticizer detection device for wastewater treatment, comprising the following steps: Step 1: Weigh the empty container and record the mass , weigh the sample container and record the mass ; Step 2: Place the filter paper tube at the bottom of the tube; Step 3: Install the container assembly on the inside of the tube and add the extraction liquid into the flask; Step 4: Use a heater to heat the extract inside the flask; Step 5: When a certain amount of mixture is contained in the test tube, a linear drive component is used to drive the plunger and the sealing plug upward to open the bottom opening, allowing the mixture to enter the interior of the tube body. The extract in the tube body flows into the flask through the siphon tube; Step 6: Repeat step 5 15 to 20 times; Step 7: Take out the components, dry them, weigh them, and record the mass ; Step 8: Calculate the plasticizer content according to the following formula :

[0017] in: Marked as plasticizer content, expressed as mass percentage; The mass of the empty container (7), ; The mass of the sample containing component (7) is marked as ; Marked as the mass of the container (7) and the residue therein, .

[0018] In a preferred embodiment, in step 1, the sample acquisition method is: taking wastewater, evaporating the water in a cooking pot and a crucible, and then transferring the wastewater into a test tube to continue evaporating the water until the water is completely evaporated.

[0019] The technical effects and advantages of the present invention are as follows: The present invention designs a holding component so as not to transfer the solid sample evaporated inside the test tube. Instead, the plasticizer in the sample is extracted by allowing the extraction liquid cooled into droplets to flow into the interior of the test tube and mix with the solid sample. The bottom is then opened to allow the liquid to flow into the tube body and finally into the flask to complete the extraction, and the plasticizer content is obtained by calculation. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the overall structure of the present invention.

[0021] Figure 2 It is a schematic diagram of the local structure of the present invention.

[0022] Figure 3 For the present invention Figure 2 Schematic diagram of the partial structure of the sectional view of the main view.

[0023] Figure 4 For the present invention Figure 3 A magnified view of the local structure at point A.

[0024] Figure 5 This is a schematic diagram of the installation of the movable sleeve and stirring blade of the present invention.

[0025] Figure 6 For the present invention Figure 1 A magnified view of the local structure at point B in the middle.

[0026] Figure 7 For the present invention Figure 5 main view.

[0027] Figure 8 For the present invention Figure 7 Cross-sectional view at CC.

[0028] Figure 9 This is a flow chart of the plasticizer content detection method of the present invention.

[0029] The accompanying drawings are marked as follows: 1. bracket; 11. test tube clamp; 12. support frame; 2. heater; 3. flask; 4. Soxhlet extractor; 41. tube body; 42. tube bottom; 43. steam pipe; 44. siphon; 5. condenser; 6. filter paper tube; 7. holding assembly; 71. test tube; 711. bottom mouth; 72. insertion rod; 720. fixing block; 721. elliptical rod; 722. round rod; 73. sealing plug; 74. spring; 75. movable sleeve; 76. stirring blade; 8. linear drive component; 81. motor 1; 82. cam; 83. disc; 9. connecting assembly; 91. lower fixing plate; 92. upper fixing plate; 93. pin; 100. motor 2. DETAILED DESCRIPTION

[0030] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts shall fall within the scope of protection of the present invention.

[0031] Plasticizers in industrial wastewater and surface sewage pose a serious threat to ecosystems and human health. Therefore, it's necessary to test for plasticizer content in treated wastewater. The following describes the wastewater treatment process, post-treatment testing equipment, and methods for testing plasticizer content.

[0032] (1) Wastewater treatment process Wastewater treatment is achieved by combining new composite adsorbents with advanced oxidation technology. The wastewater treatment device includes a composite adsorption module and an advanced oxidation module.

[0033] The composite adsorption module is filled with a new composite material adsorbent, which is made of biomass carbon sources (such as straw, wood chips, fruit shells and other agricultural / forestry waste obtained by carbonization treatment, with high specific surface area and rich pore structure) and magnetic nanomaterials (such as 、 , with magnetic and chemical stability) are compounded through physical mixing or chemical synthesis. The adsorbent is filled in a column or tank container to form a high-efficiency adsorption layer.

[0034] The advanced oxidation module uses a combination of ultraviolet photocatalytic oxidation and Fenton oxidation technology, including an ultraviolet photocatalytic unit and a Fenton oxidation unit. The ultraviolet photocatalytic unit is equipped with an ultraviolet light source (such as a UV-C lamp) and a photocatalyst (such as 、 ), which generates hydroxyl radicals by irradiating the photocatalyst with ultraviolet light ( ). Fenton Oxidation Unit: Setup Dosing system and Dosing system, through and The reaction generates hydroxyl radicals, which enhance the oxidation effect.

[0035] Processing method flow: Adsorption stage: After pretreatment, the wastewater flows into the composite adsorption module. The new composite material adsorbent captures pollutants such as plasticizers in the water through physical adsorption, chemical adsorption, etc., so that the pollutants are enriched on the surface of the adsorbent.

[0036] Oxidation stage: The adsorbent saturated with adsorption enters the advanced oxidation module, where it first generates strong oxidizing hydroxyl radicals through ultraviolet catalytic oxidation to degrade pollutants such as adsorbed plasticizers. and , start the Fenton oxidation reaction, further decompose pollutants such as refractory plasticizers, and eventually convert them into 、 and other substances.

[0037] Adsorbent regeneration: Utilizing the magnetic response characteristics of magnetic nanomaterials, the adsorbent is separated through an external magnetic field and can be reused after cleaning, reducing operating costs.

[0038] Taking the treatment of plasticizers in surface water as an example, during treatment: (1) Device parameters: composite adsorption module filling volume 100L, UV power 500W, Dosage concentration 30mg / L, The dosage concentration is 80 mg / L.

[0039] (2) Treatment process: Surface water containing plasticizer (concentration 200 ng / L) passes through the adsorption module at a flow rate of 8 L / min and a residence time of 15 min.

[0040] (3) The adsorbent can be reused 5 times after oxidation regeneration.

[0041] (2) Plasticizer detection device and method for wastewater treatment The core concept of this detection device is to extract the plasticizer from the solid sample, and calculate the plasticizer content through the mass change of the solid sample before and after. Therefore, it is necessary to obtain a solid sample first. Specifically, the sample acquisition method is: take the wastewater, evaporate the water through a cooking pot and a crucible, and then transfer it to a test tube to continue evaporating the water until the water is completely evaporated. Here, it should be noted that when the wastewater is transferred from the cooking pot to the crucible and then to the test tube, the precipitate produced in the wastewater is also transferred together, and no residue is allowed. When the water content of the wastewater in the test tube is completely evaporated, it should not be transferred again. The reason is that the remaining solid sample without water will adhere to the wall of the tube and is difficult to transfer completely, resulting in the problem of small test results. Therefore, it is necessary to use a test tube directly for extraction.

[0042] Refer to the instruction manual Figures 1-9 In this embodiment, a plasticizer detection device for wastewater treatment includes a support 1, on which are mounted a heater 2 and a flask 3. The heater 2 is used to heat the extract contained in the flask 3. A Soxhlet extractor 4 is mounted on the upper end of the flask 3, and a condenser 5 is mounted on the upper end of the Soxhlet extractor 4. The heater 2 is a water bath heater, and the condenser 5 is a spherical condenser. A test tube clamp 11 is mounted on the support 1 to hold the condenser 5.

[0043] like Figure 3 As shown, the Soxhlet extractor 4 includes a tube body 41, a tube bottom 42 is provided at the bottom of the tube body 41, and a steam pipe 43 and a siphon tube 44 are respectively provided on both sides of the tube body 41. The steam pipe 43 connects the tube bottom 42 with the upper end of the side of the tube body 41, and the siphon tube 44 connects the bottom of the tube body 41 with the tube bottom 42, and the siphon tube 44 is bent upward.

[0044] like Figure 3 and Figure 4As shown, a holding component 7 is provided inside the tube body 41, and the holding component 7 includes a test tube 71. The test tube 71 is used to hold the sample to be tested. The bottom of the test tube 71 has a bottom opening 711. An insertion rod 72 is inserted in the middle of the holding component 7. The bottom end of the insertion rod 72 is fixedly connected to a sealing plug 73. The sealing plug 73 is inserted into the bottom opening 711 to seal the bottom opening 711.

[0045] like Figure 1 and Figure 6 As shown, a linear drive component 8 is mounted on the bracket 1, and the linear drive component 8 is used to drive the insertion rod 72 to move up and down. Specifically, the linear drive component 8 includes a motor 1 81, and the output end of the motor 1 81 is fixedly connected to a cam 82. The top end of the insertion rod 72 extends upward to the top of the condenser tube 5 and is mounted with a disc 83. The cam 82 is located below the disc 83 and the cam 82 is in contact with the bottom surface of the disc 83. When the motor 1 81 drives the cam 82 to rotate, the cam 82 pushes the disc 83 upward, thereby driving the insertion rod 72 and the sealing plug 73 to move upward through the disc 83, thereby opening the bottom opening 711.

[0046] It should be noted that the disc 83 is composed of a nut and a disc. The nut is welded to the middle of the disc, and the disc 83 is threadedly connected to the upper end of the insertion rod 72 through the nut.

[0047] Furthermore, if Figure 3 and Figure 4 As shown, the plasticizer detection device also includes a connecting component 9, which includes a lower fixing plate 91 and an upper fixing plate 92. The lower fixing plate 91 is fixedly installed on the upper end of the tube body 41, and the upper fixing plate 92 is installed on the upper end of the test tube 71. Both ends of the upper fixing plate 92 are fixedly installed with pins 93, and the pins 93 are movably inserted into the lower fixing plate 91 downward.

[0048] It should be noted that when the upper fixing plate 92 is installed on the lower fixing plate 91, the pin 93 can be aligned with the hole on the lower fixing plate 91 and inserted. The connection method between the test tube 71 and the upper fixing plate 92 can be threaded connection or interference fit.

[0049] Furthermore, if Figure 3 and Figure 4 As shown, the insertion rod 72 is located at the upper side of the test tube 71 and is fixedly connected to a fixing block 720. A spring 74 is sleeved on the insertion rod 72, and both ends of the spring 74 are pressed against the fixing block 720 and the upper fixing plate 92 respectively.

[0050] It should be noted that after the insertion rod 72 moves upward, it can be reset downward under the action of the spring 74.

[0051] In this embodiment, the plasticizer content is detected according to the following steps.

[0052] Step 1: Before obtaining the solid sample, weigh the empty container 7 and record the mass After obtaining the solid sample, weigh the sample container 7 and record the mass .

[0053] Step 2: If Figure 3 and Figure 4 As shown, a filter paper tube 6 is placed at the bottom of the tube body 41.

[0054] Step 3: Install the containing component 7 on the inner side of the tube body 41, add the extraction liquid into the interior of the flask 3, the extraction liquid is ethanol or ether, and then assemble the device.

[0055] Step 4: Use heater 2 to heat the extract in flask 3. The heated extract is evaporated, and the steam flows upward to condenser 5 through steam pipe 43 and the holes on the upper side wall of test tube 71. After condensation in condenser 5, droplets are formed and flow downward to the inside of test tube 71, contacting the solid sample in test tube 71 to extract the plasticizer in the solid sample.

[0056] Step 5: When a certain amount of mixture is contained in the test tube 71, the linear drive component 8 is used to drive the insertion rod 72 and the sealing plug 73 to move upward to open the bottom opening 711, so that the mixture can enter the interior of the tube body 41. When the liquid level in the tube body 41 exceeds the uppermost end of the siphon tube 44, the extract in the tube body 41 is filtered through the filter paper tube 6 and then flows into the flask 3 through the siphon tube 44 by siphon action.

[0057] Step 6: Repeat step 5 15 to 20 times to extract all the plasticizers in the sample into the extract.

[0058] Step 7: Take out the container 7, dry it, weigh it, and record the mass ; Step 8: Calculate the plasticizer content according to the following formula :

[0059] in: Marked as plasticizer content, expressed as mass percentage; The mass of the empty container (7), ; The mass of the sample containing component (7) is marked as ; Marked as the mass of the container (7) and the residue therein, .

[0060] The above technical solution, by designing the holding component 7, does not transfer the solid sample evaporated inside the test tube 71. Instead, the plasticizer in the sample is extracted by allowing the extraction liquid cooled into droplets to flow into the interior of the test tube 71 and mix with the solid sample. The bottom opening 711 is then opened to allow the liquid to flow into the tube body 41 and finally into the flask 3 to complete the extraction, and the plasticizer content is obtained by calculation.

[0061] Refer to the instruction manual Figure 3-Figure 8 The solid sample remaining in the test tube 71 after evaporating the wastewater is prone to agglomeration after being exposed to high temperature, causing the droplets to remain on the surface during the first extraction and need to slowly penetrate downward, thereby significantly reducing the extraction efficiency. Therefore, it is necessary to increase its extraction speed. A stirring method can be used, but if a fixed stirring device is set, the stirring device needs to be designed at the bottom of the test tube 71. However, in this case, due to sample agglomeration, a large force is required for the initial stirring, which can easily cause the test tube 71 to break or fall off at the installation point of the upper fixed plate 92. Therefore, the following design is made in this embodiment.

[0062] Specifically, the containing component 7 also includes a movable sleeve 75 that is sleeved on the insertion rod 72. Both ends of the lower side of the movable sleeve 75 are fixedly connected with stirring blades 76. The lower surface of the stirring blade 76 can fit into the bottom of the inner side of the test tube 71. The upper end of the movable sleeve 75 is detachably connected to the lower surface of the fixed block 720.

[0063] It should be noted that the movable sleeve 75 and the fixed block 720 can be fixed by magnetic attraction, and the magnet used is a ferrite magnet.

[0064] Furthermore, a second motor 100 is installed on the bracket 1, and the output wheel of the second motor 100 is vertically movably connected to the upper end of the insertion rod 72. The second motor 100 is used to drive the insertion rod 72 to rotate, and the insertion rod 72 can slide vertically relative to the output wheel of the second motor 100.

[0065] It should be noted that motor 2 100 is a reduction motor, and the upper end of the insertion rod 72 is D-shaped and movably connected to the output wheel of the reducer, so that motor 2 100 can not only drive the insertion rod 72 to rotate, but also does not affect the linear drive component 8 to drive the insertion rod 72 to rise and fall. A support frame 12 is set on the bracket 1 to support the linear drive component 8 and motor 2 100.

[0066] In this embodiment, when obtaining a solid sample by evaporation, the movable sleeve 75 and the fixed block 720 are fixed to each other. After obtaining the sample and beginning testing, a tool (such as an iron rod) is used to push the stirring blade 76 downward to separate it from the fixed block 720. After a portion of the extract drips onto the sample, the motor 100 is used to rotate the insertion rod 72, which in turn rotates the movable sleeve 75 and the stirring blade 76. The outer wall of the insertion rod 72 is smooth, allowing it to easily separate from the sample and rotate on its own. The stirring blade 76 continuously rotates on the upper surface of the sample, continuously scraping the sample surface. Under the interaction with the extract, the entire solid sample can be quickly mixed with the extract, thereby accelerating the extraction speed without affecting the installation between the test tube 71 and the upper fixed plate 92.

[0067] Furthermore, if Figure 7 and Figure 8 As shown, the portion of the insertion rod 72 located below the fixed block 720 is composed of an elliptical rod portion 721 and a round rod portion 722 from top to bottom. The inner hole of the movable sleeve 75 and the cross-section of the elliptical rod portion 721 are both elliptical.

[0068] It should be noted that the movable sleeve 75 slides on the elliptical rod 721. Through the elliptical setting, the elliptical rod 721 can drive the movable sleeve 75 to rotate, and can ensure that the elliptical rod 721 is smooth, and the sample stained can be washed off by the extraction liquid. The cross-section of the round rod 722 is circular, which can ensure that the round rod 722 can be easily separated from the sample when rotating.

[0069] Finally: The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A plasticizer detection device for wastewater treatment, characterized by: The invention comprises a support (1), wherein a heater (2) and a flask (3) are provided on the support (1), wherein the heater (2) is used to heat the extract contained in the flask (3), a Soxhlet extractor (4) is installed at the upper end of the flask (3), and a condenser (5) is installed at the upper end of the Soxhlet extractor (4); The Soxhlet extractor (4) comprises a tube body (41), a tube bottom (42) is provided at the bottom of the tube body (41), a holding assembly (7) is provided inside the tube body (41), the holding assembly (7) comprises a test tube (71), the test tube (71) is used to hold a sample to be tested, the bottom of the test tube (71) has a bottom opening (711), a plug (72) is inserted into the middle of the holding assembly (7), a sealing plug (73) is fixedly connected to the bottom end of the plug (72), and the sealing plug (73) is inserted into the bottom opening (711) to seal the bottom opening (711); A linear drive component (8) is mounted on the bracket (1), and the linear drive component (8) is used to drive the insertion rod (72) to move up and down.

2. A plasticizer detection device for wastewater treatment according to claim 1, characterized in that: The linear drive component (8) includes a motor (81), the output end of the motor (81) is fixedly connected to a cam (82), the top end of the insertion rod (72) extends upward to the top of the condenser (5) and is installed with a disc (83), the cam (82) is located below the disc (83) and the cam (82) fits the bottom surface of the disc (83), and when the motor (81) drives the cam (82) to rotate, the cam (82) pushes the disc (83) upward.

3. A plasticizer detection device for wastewater treatment according to claim 1, characterized in that: The plasticizer detection device further comprises a connecting assembly (9), the connecting assembly (9) comprising a lower fixing plate (91) and an upper fixing plate (92), the lower fixing plate (91) being fixedly mounted on the upper end of the tube body (41), the upper fixing plate (92) being mounted on the upper end of the test tube (71), and latches (93) being fixedly mounted on both ends of the upper fixing plate (92), the latches (93) being movably inserted downwardly into the lower fixing plate (91).

4. A plasticizer detection device for wastewater treatment according to claim 3, characterized in that: The insertion rod (72) is located at an upper position inside the test tube (71) and is fixedly connected to a fixing block (720). A spring (74) is sleeved on the insertion rod (72), and two ends of the spring (74) are respectively pressed against the fixing block (720) and the upper fixing plate (92).

5. A plasticizer detection device for wastewater treatment according to claim 4, characterized in that: The containing assembly (7) further comprises a movable sleeve (75) sleeved on the insertion rod (72), and both ends below the movable sleeve (75) are fixedly connected to stirring blades (76), and the lower surface of the stirring blades (76) can fit with the bottom of the inner side of the test tube (71), and the upper end of the movable sleeve (75) is detachably connected to the lower surface of the fixed block (720).

6. A plasticizer detection device for wastewater treatment according to claim 5, characterized in that: The portion of the insertion rod (72) located below the fixed block (720) comprises an elliptical rod portion (721) and a round rod portion (722) from top to bottom, and the inner hole of the movable sleeve (75) and the cross-section of the elliptical rod portion (721) are both elliptical.

7. A plasticizer detection device for wastewater treatment according to claim 6, characterized in that: The bracket (1) is provided with a second motor (100), the output wheel of the second motor (100) is vertically movably connected to the upper end of the insertion rod (72), the second motor (100) is used to drive the insertion rod (72) to rotate, and the insertion rod (72) can slide vertically relative to the output wheel of the second motor (100).

8. The plasticizer detection device for wastewater treatment according to claim 1, characterized in that: The Soxhlet extractor (4) further comprises a steam pipe (43) and a siphon pipe (44), wherein the steam pipe (43) connects the tube bottom (42) and the upper end of the side of the tube body (41), and the siphon pipe (44) connects the bottom of the tube body (41) and the tube bottom (42), and the siphon pipe (44) is bent upward.

9. A method for detecting plasticizer content, using the plasticizer detection device for wastewater treatment according to claim 1, characterized in that: The following steps are involved: Step 1: Weigh the empty container (7) and record the mass , weigh the sample container (7) and record the mass ; Step 2: Place a filter paper tube (6) at the bottom of the tube body (41); Step 3: Install the holding component (7) on the inner side of the tube body (41) and add the extraction liquid into the interior of the flask (3); Step 4: Use the heater (2) to heat the extract in the flask (3); Step 5: When a certain amount of the mixture is contained in the test tube (71), the linear drive component (8) is used to drive the insertion rod (72) and the sealing plug (73) to move upward to open the bottom opening (711), so that the mixture enters the interior of the tube body (41), and the extract in the tube body (41) flows into the flask (3) through the siphon (44); Step 6: Repeat step 5 15 to 20 times; Step 7: Take out the container (7), dry it, weigh it, and record the mass. ; Step 8: Calculate the plasticizer content according to the following formula : in: Marked as plasticizer content, expressed as mass percentage; The mass of the empty container (7), ; The mass of the sample containing component (7) is marked as ; Marked as the mass of the container (7) and the residue therein, .

10. A method for detecting plasticizer content according to claim 9, characterized in that: In step 1, the sample acquisition method is: taking wastewater, evaporating the water through a cooking pot and a crucible, and then transferring the wastewater to a test tube (71) to continue evaporating the water until the water is completely evaporated.

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