A device and method for detecting plasticizers in wastewater treatment

Abstract

The application 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 arranged on the support. The heater is used for heating the extraction liquid contained in the flask. The upper end of the flask is provided with a soxhlet extractor. The upper end of the soxhlet extractor is provided with a condenser tube. The soxhlet extractor comprises a tube body. The bottom of the tube body is provided with a tube bottom. The inside of the tube body is provided with a containing assembly. The containing assembly comprises a test tube. The test tube is used for containing a sample to be measured. The application designs the containing assembly. The solid sample evaporated in the test tube is not transferred. Instead, the extraction liquid cooled into droplets is caused to flow into the inside of the test tube and mix with the solid sample, so as to extract the plasticizer in the sample. Then, the bottom opening is opened, so that the extraction liquid flows into the tube body and finally flows into the flask, thereby completing the extraction. Finally, the content of the plasticizer is calculated.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of plasticizer detection, and more particularly to a plasticizer detection device and method for wastewater treatment. BACKGROUND

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

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

[0004] There are various methods for treating wastewater at present, such as physical method, chemical method, biological method, etc., and various methods have different treatment capabilities for pollutants in wastewater, and there are also significant differences in the removal efficiency of plasticizers.

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

[0006] When detecting the content of plasticizers, solid samples are needed, therefore, the wastewater needs to be evaporated to obtain residual solids, and the plasticizers are not volatile and remain in the solids, when the water in the test tube is completely evaporated, the residual solid sample will adhere to the wall, and if forcibly transferred, the sample will be lost, causing the detection result to be low. SUMMARY

[0007] The plasticizer detection device and method for wastewater treatment provided by the present application solve the problem that when the water in the test tube is completely evaporated, the residual solid sample will adhere to the wall, and if forcibly transferred, the sample will be lost, causing the detection result to be low.

[0008] To achieve the above object, the present application provides the following technical scheme: A plasticizer detection device for wastewater treatment, comprising a support, a heater and a flask are arranged on the support, the heater is used for heating the extraction liquid contained in the flask, a soxhlet extractor is installed at the upper end of the flask, and a condenser tube is installed 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, the test tube is used for containing a sample to be measured, the bottom of the test tube has a bottom opening, a plug rod is inserted at the middle of the containing assembly, a blocking plug is fixedly connected to the bottom end of the plug rod and inserted into the bottom opening to block the bottom opening; a linear drive component is installed on the support, and the linear drive component is used for driving the plug rod to ascend and descend.

[0009] In a preferred embodiment, the linear drive component comprises a motor one, a cam is fixedly connected to the output end of the motor one, the top end of the plug rod extends upwards above the condenser tube and is provided with a disc, the cam is located below the disc and is attached to the bottom surface of the disc, and when the motor one drives the cam to rotate, the cam pushes the disc upwards.

[0010] In a preferred embodiment, the plasticizer detection device further comprises a connecting assembly, the connecting assembly comprises a lower fixed plate and an upper fixed plate, the lower fixed plate is fixedly installed at the upper end of the tube body, and the upper fixed plate is installed at the upper end of the test tube; both ends of the upper fixed plate are fixedly installed with a latch, and the latch is downwardly and movably inserted into the lower fixed plate.

[0011] In a preferred embodiment, the plug rod is fixedly connected with a fixed block at the upper side position in the test tube, a spring is sleeved on the plug rod, and both ends of the spring are respectively in pressure contact with the fixed block and the upper fixed plate.

[0012] In a preferred embodiment, the containing assembly further comprises a movable sleeve sleeved on the plug rod, both ends of the movable sleeve below are fixedly connected with stirring blades, the lower surface of the stirring blade can be attached to the bottom of the inner side of the test tube, and the upper end of the movable sleeve is detachably connected with the lower surface of the fixed block.

[0013] In a preferred embodiment, the part of the plug rod below the fixed block is sequentially provided with an oval rod part and a round rod part from top to bottom, and the inner hole of the movable sleeve and the cross section of the oval rod part are both oval.

[0014] In a preferred embodiment, a motor two is installed on the support, the output wheel of the motor two is vertically and movably inserted into the upper end of the plug rod, the motor two is used for driving the plug rod to rotate, and the plug rod can vertically slide relative to the output wheel of the motor two.

[0015] In a preferred embodiment, the soxhlet extractor further comprises a steam pipe and a siphon pipe, the steam pipe connects the tube bottom and the upper end of the side of the tube body, and the siphon pipe connects the bottom of the tube body and the tube bottom and is upwardly bent.

[0016] The present application also provides a method for detecting plasticizer content, using the plasticizer detection device for wastewater treatment as described above, comprising the following steps:

[0017] Step one: weigh the empty holding assembly and record the mass , weigh the holding assembly containing the sample and record the mass ;

[0018] Step two: place a filter paper cylinder at the bottom of the tube body;

[0019] Step three: install the holding assembly inside the tube body, and add the extraction liquid to the inside of the flask;

[0020] Step four: use the heater to heat the extraction liquid inside the flask;

[0021] Step five: when the test tube contains a certain amount of mixture, use the linear drive component to drive the insertion rod and the plug to move upwards to open the bottom opening, so that the mixture enters the inside of the tube body, and the extraction liquid in the tube body flows into the flask through the siphon tube;

[0022] Step six: repeat step five 15-20 times;

[0023] Step seven: remove the holding assembly and dry it, then weigh it and record the mass ;

[0024] Step eight: calculate the plasticizer content according to the following formula :

[0025]

[0026] Wherein:

[0027] Marked as plasticizer content, expressed as a percentage by mass;

[0028] Marked as the mass of the empty holding assembly (7), ;

[0029] Marked as the mass of the holding assembly (7) containing the sample, ;

[0030] Marked as the mass of the holding assembly (7) and the residue inside it, .

[0031] In a preferred embodiment, in step one, the sample acquisition method is: take wastewater, evaporate water in a kettle, a crucible, then transfer to a test tube for further evaporation of water, until the water is completely evaporated.

[0032] The technical effects and advantages of the present application: the present application designs a containing assembly, does not transfer the solid sample evaporated in the test tube, but makes the cooling extraction liquid into droplets flow into the inside of the test tube to mix with the solid sample, extracts the plasticizer in the sample, and then flows into the tube body by opening the bottom opening, and finally flows into the flask to complete the extraction, and the content of the plasticizer is calculated. BRIEF DESCRIPTION OF DRAWINGS

[0033] Figure 1 It is a schematic diagram of the overall structure of the present application.

[0034] Figure 2 It is a schematic diagram of the local structure of the present application.

[0035] Figure 3 It is a schematic diagram of the local structure of the present application Figure 2 in the sectional view of the front view.

[0036] Figure 4 It is a schematic diagram of the local structure of the present application Figure 3 in A.

[0037] Figure 5 It is a schematic diagram of the installation of the movable sleeve and the stirring blade of the present application.

[0038] Figure 6 It is a schematic diagram of the local structure of the present application Figure 1 in B.

[0039] Figure 7 It is a front view of the present application Figure 5 .

[0040] Figure 8 It is a sectional view of the present application Figure 7 in C-C.

[0041] Figure 9 It is a flow chart of the plasticizer content detection method of the present application.

[0042] The reference signs are: 1, support; 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 tube; 6, filter paper cylinder; 7, containing assembly; 71, test tube; 711, bottom opening; 72, insertion rod; 720, fixed block; 721, elliptical rod part; 722, round rod part; 73, plugging plug; 74, spring; 75, movable sleeve; 76, stirring blade; 8, straight line driving part; 81, motor one; 82, cam; 83, disc; 9, connecting assembly; 91, lower fixed plate; 92, upper fixed plate; 93, bolt; 100, motor two. DETAILED DESCRIPTION

[0043] With reference to the accompanying drawings, the technical solutions in the embodiments of the present application will be clearly and completely described below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of the present application.

[0044] Plasticizers in industrial wastewater and surface sewage can pose a serious threat to the ecosystem and human health. Therefore, it is necessary to detect the content of plasticizers after wastewater treatment. The wastewater treatment process, detection device after wastewater treatment, and plasticizer content detection method are described below.

[0045] (I) Wastewater treatment process

[0046] Wastewater treatment is a combination of new composite adsorbent and advanced oxidation technology. The wastewater treatment device includes a composite adsorption module and an advanced oxidation module.

[0047] The composite adsorption module is filled with a new composite adsorbent, which is composed of biomass carbon source (such as straw, sawdust, fruit shell, etc. agricultural / forestry waste treated by carbonization, with high specific surface area and rich pore structure) and magnetic nanomaterial (such as , , with magnetic and chemical stability) by physical mixing or chemical synthesis process. The adsorbent is filled in a columnar or tank container to form a high-efficiency adsorption layer.

[0048] The advanced oxidation module adopts the combined technology of ultraviolet photocatalytic oxidation and Fenton oxidation, 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 (·OH) by exciting the photocatalyst under ultraviolet light irradiation. The Fenton oxidation unit: sets up dosing system and dosing system, which generates hydroxyl radicals by reacting with and , and enhances the oxidation effect.

[0049] Treatment method process:

[0050] Adsorption stage: After pretreatment, the wastewater flows into the composite adsorption module, and the new composite adsorbent captures the plasticizers and other pollutants in the water through physical adsorption, chemical adsorption, etc., so that the pollutants are enriched on the surface of the adsorbent.

[0051] Oxidation stage: the adsorbent saturated with adsorption enters the advanced oxidation module, first through ultraviolet light catalytic oxidation to produce strong oxidizing hydroxyl radicals, degrading adsorbed plasticizers and other pollutants; at the same time, H2O2 and FeSO4 are added and , starting the Fenton oxidation reaction, further decomposing the refractory plasticizers and other pollutants, and finally converting them into , and other substances.

[0052] Adsorbent regeneration: using the magnetic response characteristics of magnetic nanomaterials, the adsorbent is separated by an external magnetic field, and after cleaning it can be reused, reducing operating costs.

[0053] Taking the treatment of plasticizers in surface water as an example, the treatment is as follows:

[0054] (1) Device parameters: composite adsorption module filling capacity 100L, ultraviolet light power 500W, H2O2 addition concentration 30mg / L, FeSO4 addition concentration 80mg / L.

[0055] (2) Treatment process: surface water containing plasticizers (concentration 200ng / L) passes through the adsorption module at a flow rate of 8L / min, with a residence time of 15min.

[0056] (3) The adsorbent can be reused for 5 times after oxidation and regeneration.

[0057] (II) Plasticizer detection device and method for wastewater treatment

[0058] The core idea of the detection device is to extract plasticizers from solid samples, and calculate the content of plasticizers by the change of mass before and after the solid sample. Therefore, the solid sample needs to be obtained first. Specifically, the sample acquisition method is: taking wastewater, evaporating water in the retort and crucible, then transferring to the test tube for further evaporation of water, until the water is completely evaporated. Here, it needs to be noted that when the wastewater is transferred from the retort to the crucible and then to the test tube, the precipitate produced in the wastewater is also transferred together and cannot be left behind. However, when the water in the test tube is completely evaporated, it is not advisable to transfer it again, because the solid sample left without water will adhere to the wall and be difficult to completely transfer, causing the detection result to be smaller. Therefore, a test tube needs to be used directly for extraction.

[0059] Refer to the attached Figures 1-9In the plasticizer detection device for wastewater treatment provided in the embodiment, a support 1 is provided with a heater 2 and a flask 3, the heater 2 is used to heat the extraction liquid in the flask 3, the upper end of the flask 3 is provided with a soxhlet extractor 4, and the upper end of the soxhlet extractor 4 is provided with a condenser tube 5. The heater 2 is a water bath heater, the condenser tube 5 is a spherical condenser tube, and a test tube clamp 11 is arranged on the support 1 to clamp the condenser tube 5.

[0060] As shown in Figure 3 , the soxhlet extractor 4 comprises a tube body 41, the bottom of the tube body 41 is provided with a tube bottom 42, the two sides of the tube body 41 are respectively provided with a steam pipe 43 and a siphon pipe 44, the steam pipe 43 communicates the tube bottom 42 with the upper end of the side of the tube body 41, the siphon pipe 44 communicates the bottom of the tube body 41 with the tube bottom 42, and the siphon pipe 44 is upwardly bent.

[0061] As shown in Figure 3 and Figure 4 , the inside of the tube body 41 is provided with a containing assembly 7, the containing assembly 7 comprises a test tube 71, the test tube 71 is used to contain the sample to be measured, the bottom of the test tube 71 is provided with a bottom opening 711, the middle of the containing assembly 7 is inserted with a plug rod 72, the bottom end of the plug rod 72 is fixedly connected with a blocking plug 73, and the blocking plug 73 is inserted in the bottom opening 711 to block the bottom opening 711.

[0062] As shown in Figure 1 and Figure 6 , the support 1 is provided with a linear driving component 8, and the linear driving component 8 is used to drive the plug rod 72 to ascend and descend. Specifically, the linear driving component 8 comprises a motor 81, the output end of the motor 81 is fixedly connected with a cam 82, the top end of the plug rod 72 extends to the upper side of the condenser tube 5 and is provided with a disc 83, the cam 82 is located below the disc 83 and is attached to 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, so that the disc 83 drives the plug rod 72 and the blocking plug 73 to move upward, thereby opening the bottom opening 711.

[0063] It should be noted that the disc 83 is composed of a nut and a disc piece, the nut is welded in the middle of the disc piece, and the disc 83 is threadedly connected to the top end of the plug rod 72 through the nut.

[0064] Further, as shown in Figure 3 and Figure 4 , the plasticizer detection device further comprises a connecting assembly 9, the connecting assembly 9 comprises a lower fixed plate 91 and an upper fixed plate 92, the lower fixed plate 91 is fixedly installed at the upper end of the tube body 41, the upper fixed plate 92 is installed at the upper end of the test tube 71, and the two ends of the upper fixed plate 92 are both fixedly provided with a latch 93, and the latch 93 is movably inserted in the lower fixed plate 91.

[0065] It should be noted that when the upper fixed plate 92 is installed on the lower fixed plate 91, the plug 93 is inserted into the hole on the lower fixed plate 91, and the connection mode of the test tube 71 with the upper fixed plate 92 can adopt threaded connection or use interference fit mode for installation.

[0066] Further, as shown in Figure 3 and Figure 4 , the plug rod 72 is fixedly connected with the fixed block 720 at the upper side inside the test tube 71, the spring 74 is sleeved on the plug rod 72, and the two ends of the spring 74 are respectively pressed with the fixed block 720 and the upper fixed plate 92.

[0067] It should be noted that when the plug rod 72 moves upward, it can be reset downward under the action of the spring 74.

[0068] In this embodiment, when detecting the content of plasticizer, the following steps are taken.

[0069] Step one: before obtaining the solid sample, weigh the empty holding assembly 7, and record the mass , after obtaining the solid sample, weigh the holding assembly 7 containing the sample, and record the mass .

[0070] Step two: as shown in Figure 3 and Figure 4 , place the filter paper cylinder 6 at the bottom of the tube body 41.

[0071] Step three: install the holding assembly 7 inside the tube body 41, add extraction liquid to the inside of the flask 3, the extraction liquid is ethanol or diethyl ether, etc., and assemble the device.

[0072] Step four: use the heater 2 to heat the extraction liquid inside the flask 3, the heated extraction liquid is evaporated, the steam flows upward to the condenser 5 through the steam pipe 43 and the hole on the upper end side wall of the test tube 71, and forms droplets after condensation in the condenser 5 and flows downward to the inside of the test tube 71, and contacts with the solid sample in the test tube 71, and extracts the plasticizer in the solid sample.

[0073] Step five: when the test tube 71 has a certain amount of mixture, use the linear drive component 8 to drive the plug rod 72 and the plug 73 to move upward to open the bottom opening 711, so that the mixture enters the inside of the tube body 41, when the liquid level in the tube body 41 exceeds the uppermost end of the siphon tube 44, the extraction liquid in the tube body 41 is filtered through the filter paper cylinder 6, and then flows into the flask 3 through the siphon tube 44 by siphon effect.

[0074] Step six: repeat step five 15~20 times, so that the plasticizer in the sample is extracted into the extraction liquid.

[0075] Step seven: take out the holding assembly 7 and dry and weigh, record the mass ;

[0076] Step eight: calculate the plasticizer content according to the following formula :

[0077]

[0078] Wherein:

[0079] Marked as plasticizer content, expressed as mass percentage;

[0080] Marked as the mass of the empty holding assembly (7), ;

[0081] Marked as the mass of the holding assembly (7) containing the sample, ;

[0082] Marked as the mass of the holding assembly (7) and the residue therein, .

[0083] The above technical solution designs the holding assembly 7, without transferring the solid sample evaporated in the test tube 71, but by making the cooled extraction liquid droplets flow into the inside of the test tube 71 to mix with the solid sample, to extract the plasticizer in the sample, and then by opening the bottom opening 711 to make it flow into the pipe body 41, and finally into the flask 3 to complete the extraction, and the content of the plasticizer is calculated.

[0084] Referring to the drawings accompanying the specification Figures 3-8 The solid sample left in the test tube 71 after evaporation of wastewater is prone to caking after high temperature, which causes the liquid droplets to be retained on the surface during the first extraction, and needs to slowly penetrate downward, thus significantly reducing the extraction efficiency, therefore, it is necessary to improve the extraction speed. Stirring can be used, but if a fixed stirring device is provided, the stirring device needs to be designed at the bottom of the test tube 71, but in this way, due to the caking of the sample, a larger force is needed for initial stirring, which is easy to cause the test tube 71 and the upper fixed plate 92 to be installed to break or fall off, therefore, the following design is made in the embodiment.

[0085] Specifically, the holding assembly 7 further comprises a movable sleeve 75 sleeved on the insertion rod 72, both ends of the movable sleeve 75 below are fixedly connected with stirring blades 76, the lower surface of the stirring blades 76 can be attached to the bottom of the inside of the test tube 71, and the upper end of the movable sleeve 75 is detachably connected with the lower surface of the fixed block 720.

[0086] It should be noted that the movable sleeve 75 and the fixed block 720 can be fixed by magnetic attraction, and the magnet uses ferrite magnet.

[0087] Further, the bracket 1 is provided with a motor 100, and the output wheel of the motor 100 is vertically movably inserted into the upper end of the insertion rod 72. The motor 100 is used to drive the insertion rod 72 to rotate, and the insertion rod 72 can vertically slide relative to the output wheel of the motor 100.

[0088] It should be noted that the motor 100 is a speed reducer, and the upper end of the insertion rod 72 is in the shape of D, which is movably inserted into the output wheel of the speed reducer, so that the motor 100 can not only drive the insertion rod 72 to rotate, but also does not affect the linear driving part 8 to drive the insertion rod 72 to ascend. The bracket 1 is provided with a support frame 12 to support the linear driving part 8 and the motor 100.

[0089] In this embodiment, when the solid sample is obtained by using evaporation, the movable sleeve 75 and the fixed block 720 are fixed to each other, and when the sample is obtained and the detection is started, 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 part of the extraction liquid drops on the sample, the motor 100 is used to drive the insertion rod 72 to rotate, and the insertion rod 72 drives the movable sleeve 75 and the stirring blade 76 to rotate. The outer wall of the insertion rod 72 is smooth, which can easily rotate with the sample, and the stirring blade 76 continuously rotates on the upper surface of the sample to continuously scrape the upper surface of the sample. Under the joint action of the extraction liquid, the whole solid sample can be quickly mixed with the extraction liquid, so as to accelerate the extraction speed, and the installation between the test tube 71 and the upper fixed plate 92 is not affected.

[0090] Further, as shown in Figure 7 and Figure 8 , the part of the insertion rod 72 below the fixed block 720 is sequentially provided with an oval rod part 721 and a circular rod part 722 from top to bottom, and the inner hole of the movable sleeve 75 and the cross section of the oval rod part 721 are both in the shape of an ellipse.

[0091] It should be noted that the movable sleeve 75 slides on the oval rod part 721. By being provided in the shape of an ellipse, the oval rod part 721 can drive the movable sleeve 75 to rotate, and can ensure that the oval rod part 721 is smooth, so that the sample can be washed away by the extraction liquid. The cross section of the circular rod part 722 is circular, which can ensure that the circular rod part 722 can be easily separated from the sample when rotating.

[0092] Finally, the above description is only the preferred embodiment of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A plasticizer detection device for wastewater treatment, characterized in that: Includes a support (1), on which a heater (2) and a flask (3) are provided. The heater (2) is used to heat the extract liquid 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) includes a tube body (41), a tube bottom (42) is provided at the bottom of the tube body (41), and a holding component (7) is provided inside the tube body (41). The holding component (7) includes a test tube (71) for holding the sample to be tested. The bottom of the test tube (71) has a bottom opening (711). A rod (72) is inserted into the middle of the holding component (7). A sealing plug (73) is fixedly connected to the bottom end of the rod (72). The sealing plug (73) is inserted into the bottom opening (711) to seal the bottom opening (711). The Soxhlet extractor (4) also includes a steam pipe (43) and a siphon pipe (44). The steam pipe (43) connects the bottom of the pipe (42) and the upper end of the side of the pipe body (41). The siphon pipe (44) connects the bottom of the pipe body (41) and the bottom of the pipe (42), and the siphon pipe (44) bends upward. A linear drive component (8) is installed on the bracket (1), which is used to drive the rod (72) to rise and fall.

2. The 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 which is fixedly connected to a cam (82). The top end of the plug (72) extends upward to the top of the condenser (5) and is mounted on 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 (81) drives the cam (82) to rotate, the cam (82) pushes the disc (83) upward.

3. The plasticizer detection device for wastewater treatment according to claim 1, characterized in that: The plasticizer detection device also includes a connecting assembly (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).

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

5. The plasticizer detection device for wastewater treatment according to claim 4, characterized in that: The holding assembly (7) also includes a movable sleeve (75) fitted on the insert rod (72). Both ends of the movable sleeve (75) are fixedly connected to stirring blades (76). The lower surface of the stirring blades (76) can fit against 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 fixing block (720). A second motor (100) is installed on the bracket (1). The output wheel of the second motor (100) is vertically and movably inserted into the upper end of the insert rod (72). The second motor (100) is used to drive the insert rod (72) to rotate, and the insert rod (72) can slide vertically relative to the output wheel of the second motor (100).

6. The plasticizer detection device for wastewater treatment according to claim 5, characterized in that: The portion of the insert (72) located below the fixing block (720) consists 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.

7. A method for detecting plasticizer content, using a plasticizer detection device for wastewater treatment as described in claim 6, characterized in that, Includes the following steps: Step 1: Weigh the empty container (7) and record the mass. Weigh the container (7) containing the sample and record the mass. ; Step 2: Place the filter paper tube (6) at the bottom of the tube body (41); Step 3: Install the container (7) inside the tube (41) and add the extract into the flask (3); Step 4: Heat the extract inside the flask (3) using heater (2); Step 5: When there is a certain amount of mixture in the test tube (71), use the linear drive component (8) to drive the insert (72) and the sealing plug (73) to move upward to open the bottom opening (711) so that the mixture enters the inside of the tube body (41). The extract in the tube body (41) flows into the flask (3) through the siphon tube (44). Step Six: Repeat Step Five 15-20 times; Step 7: Remove the container (7), dry it, weigh it, and record the mass. ; Step 8: Calculate the plasticizer content using the following formula. : in: The plasticizer content is indicated as a percentage by mass. The mass of the empty container component (7), ; The mass of the container (7) containing the sample is marked. ; The mass of the container (7) and the residue therein is marked. .

8. The method for detecting plasticizer content according to claim 7, characterized in that, In step one, the sample acquisition method is as follows: take wastewater, evaporate the water through a cooking pot and crucible, and then transfer it to a test tube (71) to continue evaporating the water until the water is completely evaporated.

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