Extraction device for in-situ enrichment of environmental water pollutants

Abstract

The utility model discloses an extraction device for in-situ enrichment of environmental water pollutants, which comprises a shell, and the top end of the shell is connected with a buoy through a plurality of buoy connecting rods; an air stone is arranged in the shell, the bottom of the air stone is communicated with an opening end of a communicating pipe, the communicating pipe penetrates through the side wall of the shell, the other opening end of the communicating pipe is located on the outer side of the shell, the lower end of the shell is connected with an extraction tank, the bottom of the extraction tank is communicated with a net tank, cation exchange resin is arranged in the net tank, and the cation exchange resin is communicated with the net tank. A suction and extraction sheet made of a porous adsorbent is arranged in the extraction tank, and the net tank and the extraction tank are separated by the suction and extraction sheet. According to the device, the problems that in-situ rapid enrichment cannot be realized in the existing off-line treatment process and the device is interfered by metal salt ions are solved, the extraction efficiency and the detection accuracy are improved by eliminating ion interference and in-situ enrichment, and the device has portability and stability at the same time.

Description

Technical Field

[0001] This utility model belongs to the field of environmental monitoring, and specifically relates to an extraction device for in-situ enrichment of environmental water pollutants. Background Technology

[0002] With the widespread use of pharmaceuticals, agricultural chemicals, and personal care products, their residues and metabolites enter the aquatic environment through surface runoff and wastewater discharge, forming trace pollutants with biotoxicity, ranging in concentration from nanograms per liter to micrograms per liter. Although the concentrations of these pollutants are extremely low, they can pose a threat to ecosystems and human health through bioaccumulation, thus urgently requiring dynamic and long-term monitoring methods for pollution early warning.

[0003] Currently, environmental water pollutant detection technologies rely on offline laboratory processes (including sampling, transportation, and multi-stage pretreatment). This can lead to pollutant degradation or loss during transportation and treatment, making in-situ rapid enrichment impossible. Furthermore, metal salt ions in the water (such as Ca2+)... 2 Ion ions (such as Mg2+) can interfere with the enrichment of target pollutants, significantly reducing the adsorption efficiency of solid-phase extraction materials and thus decreasing the accuracy of detection results. Although existing technologies have attempted to improve this through modification of adsorption materials or optimization of flow channels, the synergistic technical bottleneck of "rapid on-site enrichment - elimination of ion interference - portable and stable device" has not yet been systematically resolved, which limits the practical application of dynamic monitoring of environmental water pollution. Utility Model Content

[0004] In order to overcome the shortcomings of the existing technology, the present invention aims to provide an extraction device for in-situ enrichment of environmental water pollutants, which solves the problems of in-situ rapid enrichment in offline treatment processes and interference of metal salt ions in water with the enrichment of target pollutants, thereby improving the adsorption efficiency and accuracy of the detection results of the extraction device, while achieving in-situ rapid enrichment and eliminating ion interference, and is both portable and stable.

[0005] This utility model is achieved through the following technical solution:

[0006] An extraction device for in-situ enrichment of environmental water pollutants includes a shell, the top of which is connected to floats via multiple float connecting rods; an air stone is disposed inside the shell, the bottom of which is connected to the open end of a connecting pipe, the connecting pipe passing through the side wall of the shell, with the other open end located outside the shell; an extraction tank is connected to the lower end of the shell, the bottom of which is connected to a mesh groove, a cation exchange resin is disposed in the mesh groove, and an extraction plate made of porous adsorbent is disposed in the extraction tank, the mesh groove and the extraction tank being separated by the extraction plate.

[0007] Furthermore, the bottom of the extraction tank is provided with a circular hole, the extraction tank is connected to the mesh groove through the circular hole, and the extraction plate completely covers the circular hole.

[0008] Furthermore, multiple fixing rods are fixedly connected to the inner wall of the housing, and the other end of the multiple fixing rods is fixedly connected to the tube body of the connecting pipe located inside the housing.

[0009] Furthermore, the float connecting rods are at least two in number.

[0010] Furthermore, the pore size of the gas stone is 50-100 μm.

[0011] Furthermore, an external air pump is connected to the open end of the connecting pipe located on the outside of the housing.

[0012] Furthermore, the connecting pipe is a U-shaped connecting pipe.

[0013] Furthermore, the gas stone is made of ceramic or quartz material.

[0014] Furthermore, there are three fixing rods.

[0015] Compared with the prior art, the beneficial effects of this utility model are as follows:

[0016] This invention utilizes a buoyancy-gas driven circulation system formed by a float at the top, an air stone, and a connecting pipe. The float allows the device to float autonomously in the water, and the gas released by the air stone escapes through the gap between the float connecting rod and the shell, simultaneously generating a continuous water flow. The gas flow rate can reach 0.5-1.5 L / min, achieving in-situ rapid enrichment and shortening the enrichment time. The inlet trough at the end of the device is filled with cation exchange resin, which can preferentially adsorb Ca before the liquid to be tested enters the extraction tank. 2 Interfering ions such as Mg2+ and Mg2+ are eliminated, which improves the adsorption efficiency of the extraction plate and significantly improves the accuracy of subsequent detection. At the same time, the device adopts a modular assembly design, and the float, shell and extraction tank can be quickly disassembled and assembled. The total weight is less than 30g, which makes it easy to carry. In addition, the three fixed rods connected to the shell through the connecting pipe can ensure the stability of the device underwater, which can ensure the continuous operation of the device in complex water bodies such as rivers and lakes.

[0017] The gas stone used in this invention features a microporous gas release design (pore size 50-100μm), which can uniformly disperse gas bubbles and prevent the extraction plate from being washed away due to excessively high local flow rates. Simultaneously, this design also reduces the adhesion of algae or suspended matter to the inner wall of the shell, thereby extending the continuous operating cycle of the device. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of the extraction device of this utility model.

[0019] Figure 2 This is a front sectional view of the extraction device of this utility model.

[0020] Figure 3 This is an exploded view of the extraction device of this utility model.

[0021] Figure 4(a) is a top view of the extraction device of this utility model.

[0022] Figure 4(b) is a bottom view of the extraction device of this utility model.

[0023] Explanation of reference numerals in the attached diagram: 1. Float; 2. Float connecting rod; 3. Shell; 4. Air stone; 5. Connecting pipe; 6. Cation exchange resin; 7. Mesh trough; 8. Extraction plate; 9. Extraction tank; 10. Fixing rod. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] like Figure 1-2 As shown, this utility model proposes an extraction device for in-situ enrichment of environmental water pollutants, including a float 1, float connecting rods 2, a shell 3, an air stone 4, a connecting pipe 5, a cation exchange resin 6, a mesh trough 7, an extraction plate 8, an extraction tank 9, and a fixing rod 10; the top of the shell 3 is connected to two float connecting rods 2, and the other end of the two float connecting rods 2 is connected to a float 1, which provides buoyancy support to keep the device in a relatively stable position and attitude in the water; an air stone 4 is provided inside the lower end of the shell 3, and the air stone 4... The pore size is 50-100μm, and the material is ceramic or quartz. The gas stone 4 can drive the water outside the device to surge upward through the cation exchange resin by uniformly releasing air bubbles, so that the water sample to be tested continuously passes through the extraction plate, and the target analyte is enriched on the extraction plate. The bottom of the gas stone 4 is connected to the open end of the connecting pipe 5. The connecting pipe 5 is a U-shaped connecting pipe that extends outward through the shell 3. The other open end of the connecting pipe 5 is located outside the shell 3 and is connected to an external air pump. The connecting pipe 5 transmits the gas generated by the external air pump to the gas stone 4.

[0026] like Figure 3As shown in Figure 4(b), the lower end of the shell 3 is connected to an extraction tank 9. The bottom of the extraction tank 9 is provided with a circular hole. The extraction tank 9 is connected to the mesh tank 7 through the circular hole. An adsorption sheet 8 made of porous adsorbent is provided in the extraction tank 9. The mesh tank 7 and the extraction tank 9 are separated by the adsorption sheet 8. A cation exchange resin 6 is provided in the mesh tank 7.

[0027] As shown in Figure 4(a), three fixing rods 10 are fixedly connected to the inner wall of the housing 3, and the other end of the three fixing rods 10 is fixedly connected to the tube body of the connecting pipe 5 located inside the housing 3.

[0028] When using this device for extraction, first load the cation exchange resin 6 into the mesh trough 7, then place the extraction plate 8 into the extraction tank 9, install the extraction tank 9 on the shell 3, and connect the float 1 to the upper end of the shell through the float connecting rod 2. After assembly, connect the outer tube of the connecting pipe 5 to the external air pump and turn on the external air pump switch. Place the device in the ambient water body. The float 1 floats above the liquid surface, and the rest of the device is below the liquid surface. The gas enters the gas stone 4 through the connecting pipe 5 and is released from the gas stone 4. The gas moves upward and escapes from the gap between the float 1, the float connecting rod 2 and the shell 3.

[0029] The extraction plate 8 in this invention can be flexibly replaced with a material with a specific function (such as C18 bonded silica gel or molecularly imprinted polymer) according to the type of target pollutant, such as organochlorine pesticides or antibiotics, thereby expanding the application scenarios of the device; the cation exchange resin 6 can be replaced and adjusted according to the distribution of metal ions in the ambient water, improving the flexibility of the device.

[0030] This invention systematically solves the challenge of synergistic optimization of "timeliness, accuracy, and applicability" in in-situ detection of environmental water pollutants through the synergistic design of a passive buoyancy-driven structure and an ion interference pre-elimination module. A circular float is installed at the top of the device, allowing it to float autonomously on the water surface. Utilizing buoyancy, it achieves in-situ sampling and enrichment of environmental water pollutants, thereby improving the timeliness of environmental sample pretreatment. The end inlet integrates a cation exchange resin mesh, preferentially removing Ca before enrichment. 2 Interfering ions such as Mg2+ are used to improve the enrichment efficiency of target pollutants, thereby improving the accuracy of analysis and detection. An integrated process of "in-situ sampling-ion shielding-large volume enrichment" is formed, which breaks through the dependence of existing technologies on laboratory environment and complex equipment, and has no limitation on theoretical enrichment multiple, providing a lightweight and highly reliable solution for dynamic monitoring of environmental pollutants.

Claims

1. An extraction device for in-situ enrichment of environmental water pollutants, characterized in that, The device includes a shell (3), the top of which is connected to a float (1) via multiple float connecting rods (2); an air stone (4) is provided inside the shell (3), the bottom of which is connected to the opening end of a connecting pipe (5), the connecting pipe (5) passes through the side wall of the shell (3), and the other opening end is located outside the shell (3); an extraction tank (9) is connected to the lower end of the shell (3), the bottom of which is connected to a mesh groove (7), a cation exchange resin (6) is provided in the mesh groove (7), and an extraction sheet (8) made of porous adsorbent is provided in the extraction tank (9), the mesh groove (7) and the extraction tank (9) are separated by the extraction sheet (8).

2. The extraction device for in-situ enrichment of environmental water pollutants according to claim 1, characterized in that, The bottom of the extraction tank (9) is provided with a circular hole, and the extraction tank (9) is connected to the mesh tank (7) through the circular hole. The extraction plate (8) completely covers the circular hole.

3. The extraction device for in-situ enrichment of environmental water pollutants according to claim 1, characterized in that, Multiple fixing rods (10) are fixedly connected to the inner wall of the housing (3), and the other end of the multiple fixing rods (10) is fixedly connected to the tube body of the connecting pipe (5) located inside the housing (3).

4. An extraction device for in-situ enrichment of environmental water pollutants according to claim 1, characterized in that, The float connecting rod (2) consists of at least two rods.

5. An extraction device for in-situ enrichment of environmental water pollutants according to claim 1, characterized in that, The pore size of the gas stone (4) is 50-100 μm.

6. An extraction device for in-situ enrichment of environmental water pollutants according to claim 1, characterized in that, The opening end of the connecting pipe (5) located outside the housing (3) is connected to an external air pump.

7. An extraction device for in-situ enrichment of environmental water pollutants according to claim 1, characterized in that, The connecting pipe (5) is a U-shaped connecting pipe.

8. An extraction device for in-situ enrichment of environmental water pollutants according to claim 5, characterized in that, The gas stone (4) is made of ceramic or quartz.

9. An extraction device for in-situ enrichment of environmental water pollutants according to claim 3, characterized in that, There are 3 fixing rods (10).

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