A membrane-based passive sampler for the enrichment of pathogens in domestic sewage

Abstract

This utility model relates to the field of water sample collection technology, and discloses a membrane-type passive sampler for pathogen enrichment in domestic sewage. It includes: a shell, a pressure cap that mates with the shell, and a separator disposed inside the shell; the separator divides the interior of the shell into at least two independent receiving cavities, each containing a detachable adsorption module for pathogen enrichment. The capsule-type adsorption module allows for convenient replacement and diverse combinations of adsorption materials. One sampler can collect one or two different pathogens, or perform parallel sample collection, greatly improving sampling efficiency and data reliability. Simultaneously, the internal structure of the sampler's shell and the separator ensure the independence and loading stability of the samples, avoiding cross-contamination.

Description

Technical Field

[0001] This utility model relates to the field of water sample sampling technology, specifically to a membrane-type passive sampler for enriching pathogens in domestic sewage. Background Technology

[0002] Current water sampling mainly relies on on-site active sampling, i.e. instantaneous sampling. This method is highly flexible but has obvious limitations: it can only reflect instantaneous concentration, is not representative enough, is difficult to respond to emergency event tracking, and requires large sample size and repeated analysis for trace substances. The data is highly random and not conducive to accurately assessing concentration and trends.

[0003] Existing patent CN117129273A discloses a wastewater sampling device and method, in which an adsorbent is placed into a filling chamber, requiring the packing material to be covered with an outer membrane and rolled into a cylindrical shape and placed inside. Next, a gravity ball is placed in the sampler to submerge it in the water. However, in the aforementioned patent, the packing material loading process is complex, the placement stability is low, and it is not conducive to recovery. Furthermore, adding weights to make the sampler sink increases costs. Utility Model Content

[0004] The purpose of this invention is to provide a membrane-based passive sampler for the enrichment of pathogens in domestic sewage, in order to overcome the aforementioned shortcomings of the prior art.

[0005] To achieve the above objectives, this utility model provides the following technical solution: A membrane-type passive sampler for enriching pathogens in domestic sewage includes: a housing, a pressure cap that cooperates with the housing, and a partition disposed inside the housing; The separator divides the interior of the housing into at least two independent containment cavities, each of which is detachably provided with an adsorption module for enriching pathogens.

[0006] As a further improvement of one embodiment of the present invention, the outer shell and the pressure cap are assembled to form a streamlined shape.

[0007] As a further improvement of one embodiment of the present invention, the adsorption module is a detachable sealed chamber structure.

[0008] As a further improvement of one embodiment of the present invention, the adsorption module has a perforated structure on its chamber wall for water to pass through.

[0009] As a further improvement of one embodiment of the present invention, the adsorption module is assembled from at least two components through a mating structure.

[0010] As a further improvement of one embodiment of the present invention, the separator includes a support portion for supporting the adsorption module, the support portion being configured to maintain a gap between adjacent adsorption modules.

[0011] As a further improvement of one embodiment of the present invention, the receiving cavity is provided with a positioning structure for positioning the adsorption module; the positioning structure includes a fixed base, a first positioning groove formed on the fixed base, and a plurality of connecting holes located at the bottom of the positioning groove.

[0012] As a further improvement of one embodiment of the present invention, the outer casing includes a body and an end cap.

[0013] As a further improvement of one embodiment of the present invention, the main body is provided with an installation port for installing the cover, and the edge of the installation port is provided with a fixing structure for cooperating with the cover; The fixing structure includes a locking part near one of the end caps, a positioning part near the other end cap, and a positioning part located in the middle.

[0014] As a further improvement of one embodiment of the present invention, the pressure cap is provided with a mating structure adapted to the fixing structure; The mating structure includes a latch located at one end of the pressure cap, which slides into the engaging portion; it also includes a second positioning groove that engages with the positioning portion.

[0015] As a further improvement of one embodiment of the present invention, the outer shell and the pressure cap are provided with a mesh portion.

[0016] This invention has the following advantages: By setting up a capsule-type adsorption module, the adsorption material can be easily replaced and combined in various ways. One sampler can collect one or two different pathogens, or perform parallel sample collection, which greatly improves sampling efficiency and data reliability. At the same time, the internal shell and partition structure of the sampler ensure the independence and loading stability of the samples and avoid cross-contamination. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in this utility model. For those skilled in the art, other drawings can be obtained based on these drawings.

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

[0019] Figure 2 This is a schematic diagram of the exploded structure of this utility model.

[0020] Figure 3 This is a schematic diagram of the assembly structure of the outer shell and the adsorption module of this utility model.

[0021] Figure 4 This is a schematic diagram of the internal structure of the outer shell of this utility model.

[0022] Figure 5 This is a schematic diagram of the cap structure of this utility model.

[0023] Figure 6 This is a schematic diagram of the two components constituting the adsorption module of this utility model.

[0024] Explanation of reference numerals in the attached figures: 100. Outer shell; 11. Receiving cavity; 12. Positioning structure; 121. Fixing base; 122. First positioning groove; 123. Connecting hole; 13. Main body; 131. Mounting port; 132. Fixing structure; 132a. Engaging part; 132b. Positioning part; 14. End cap; 200. Pressure cap; 21. Mating structure; 211. Bayonet; 212. Second positioning groove; 300. Separator; 31. Support part; 311. Protrusion; 400. Adsorption module; 41. Sealed chamber structure; 411. Upper filling chamber; 411a. First hole; 411b. First central hole; 411c. First mating part; 412. Lower filling chamber; 412a. Second hole; 412b. Second central hole; 412c. Second mating part; 42. Hole structure; 500. Grid part. Detailed Implementation

[0025] 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.

[0026] See Figures 1 to 6 As shown, this utility model provides a membrane-type enrichment passive sampler for pathogens in domestic sewage, which mainly includes a shell 100, a pressure cap 200 that is detachably fitted with the shell 100, a separator 300 disposed inside the shell 100, and two adsorption modules 400 that are detachably disposed inside the shell 100.

[0027] The outer shell 100, pressure cap 200, separator 300, and adsorption module 400 are preferably made of high-strength, high-wear-resistant nylon. Figure 1As shown, the outer shell 100 and the pressure cap 200 together form a streamlined shape such as a spindle, teardrop, or ellipse, which effectively reduces resistance in the water, prevents debris from getting tangled, and optimizes the flow field, allowing the water to flow more smoothly through the sampler and improving the enrichment efficiency of pathogens.

[0028] Specifically, such as Figure 4 As shown, the outer casing 100 includes a hollow, generally cylindrical body 13 and two end caps 14 that are detachable or integrally formed and connected to both ends of the body 13. A rectangular mounting opening 131 is provided on the side wall of the body 13 for installing and removing the internal adsorption module 400. Figure 2 and 3 As shown.

[0029] like Figures 1 to 4 As shown, each end cap 14 has a conical structure, with multiple holes evenly distributed on its conical surface and top. These holes together form a channel for water flow. Actual tests have shown that the size of the holes ensures sufficient water exchange while effectively preventing large particles or debris from entering the shell and causing blockage.

[0030] Both the outer casing 100 and the pressure cap 200 are provided with a mesh section 500 to increase the water-passing area. Furthermore, the end cap 14 of the outer casing 100 is thickened for attaching the sample rope. One end of the sampler is tightly bound and completely submerged in the water sample. Depending on the actual site conditions, the other end of the sample rope is fixed externally. The thickened design of the sampler, along with the fact that the density of nylon is higher than that of water, allows the sampler to self-immerse in the water without adding weight, reducing costs and unnecessary operational procedures.

[0031] like Figure 4 As shown, the shape of the pressure cap 200 is adapted to the mounting opening 131 on the main body 13. A locking portion 132a is provided on one long edge of the mounting opening 131, near one end cap 14. Positioning portions 132b are provided on the same long edge of the mounting opening 131, near the other end cap 14 and approximately in the middle. Correspondingly, a latch 211 adapted to the locking portion 132a is provided at one end of one long side of the pressure cap 200, and two second positioning grooves 212 adapted to the positioning portions 132b are also provided on the same long side.

[0032] During installation, align the latch 211 of the cover 200 with the engaging part 132a, and then rotate the cover 200 downward with the engaging part 132a as the axis, so that the positioning part 132b slides into the second positioning groove 212. The cover 200 is then tightly fixed to the mounting port 131 by fastening screws (not shown in the figure) or a snap-fit ​​mechanism, forming a sealed and stable overall structure to prevent the cover 200 from slipping off.

[0033] In addition, such as Figure 2 and 3 As shown, the separator 300 is fixedly installed in the central area inside the housing 100. It mainly includes an arc-shaped support 31 protruding from the inner wall of the main body 13 of the housing 100 towards the center. The curvature of this arc-shaped support 31 matches the curvature of the outer wall of the adsorption module 400, providing stable support for one end of the adsorption module 400. An arc-shaped protrusion 311 further protrudes upwards from the support 31. When two adsorption modules 400 are placed side-by-side, this arc-shaped protrusion 311 fits precisely into the gap between the two modules, ensuring that they will not contact or collide under fluid impact or vibration, thereby preventing cross-contamination and maintaining sample independence and stability.

[0034] The separator 300 divides the interior of the housing 100 into two completely independent and symmetrical receiving cavities 11. Each receiving cavity 11 is provided with a positioning structure 12 for precisely positioning the adsorption module 400.

[0035] Specifically, such as Figure 3 and 4 As shown, the positioning structure 12 includes a fixing seat 121 fixed inside the receiving cavity 11. The fixing seat 121 is a circular block with a circular first positioning groove 122 formed in the direction facing the partition 300 in the central region of the outer casing 100. The shape of this groove matches the shape of the other end of the adsorption module 400, thus restricting the axial movement of the adsorption module 400. Multiple through holes 123 are also formed through the fixing seat 121, ensuring that water can circulate freely within the receiving cavity 11 and fully contact the entire surface of the adsorption module 400.

[0036] like Figure 6 As shown, in this embodiment, the adsorption module 400 is a detachable, sealed capsule-shaped chamber structure. Each adsorption module 400 is assembled from an upper packing chamber 411 and a lower packing chamber 412 via a mating structure 21.

[0037] The upper packing chamber 411 has a plurality of first holes 411a evenly distributed on its circumferential outer wall surface, with a first central hole 411b penetrating through its bottom center. A first mating part 411c is provided at the edge of its opening; in this embodiment, the first mating part 411c is an annular groove. The lower packing chamber 412 also has a plurality of second holes 412a evenly distributed on its circumferential outer wall surface, with a second central hole 412b penetrating through its bottom center. A second mating part 412c is provided at the edge of its opening; in this embodiment, the second mating part 412c is a protruding retaining ring, and the retaining ring is adapted to the annular groove.

[0038] The first hole 411a, the second hole 412a, the first central hole 411b, and the second central hole 412b on the bulkhead together form the perforation structure 42 through which the water supply body passes, allowing sewage to flow into the interior of the bulkhead and fully contact the adsorbent material, while the adsorbent material is effectively encapsulated inside the bulkhead and will not leak. However, the diameter of the first hole 411a and the second hole 412a on the bulkhead is smaller than that of the holes on the outer shell 100 and the end cap 14, and in this embodiment, the hole roughly corresponds to the enrichment membrane.

[0039] During assembly, the upper packing chamber 411 and the lower packing chamber 412 are aligned, and pressure is applied to tightly fit the first mating part 411c (annular groove) and the second mating part 412c (locking ring) together, forming a sealed capsule. Of course, the upper packing chamber 411 and the lower packing chamber 412 can also be fitted together by threads, magnetic attraction, etc. The capsule is filled with a specific adsorbent material (not shown in the figure) for enriching pathogens. The adsorbent material can be selected according to the target pathogen. However, the loading method needs to be adjusted according to the properties of the adsorbent material. For example, granular powder packing materials such as activated carbon and polymers require storage containers to ensure that the packing material does not overflow and cause loss when in contact with the sample.

[0040] Specifically, in this embodiment, firstly, an adsorption module 400 filled with corresponding adsorption material is selected according to the type of pathogen to be monitored. Two different or identical adsorption modules 400 are placed into two receiving cavities 11 respectively. One end of the module is supported and spaced by the support portion 31 and protrusion 311 of the separator 300, and the other end is embedded in the first positioning groove 122 of the fixing seat 121 to complete the positioning. The pressure cap 200 is covered and fastened, and the entire sampler is suspended in the domestic sewage body to be monitored by means of connecting parts such as ropes.

[0041] During the flow of wastewater, it enters the sampler through the holes in the end cap 14, the mesh section 500 of the outer shell 100 and the pressure cap 200, passes through various pore structures 42 on the walls of the adsorption module 400, and comes into contact with the internal adsorption material, where the target pathogen is specifically captured and enriched. After the sampling time is completed according to the sampling settings, the sampler is retrieved. The pressure cap 200 is opened, the adsorption module 400 is removed, placed in a self-sealing bag, and stored at low temperature for transport to the laboratory. The upper and lower packing chambers are disassembled to remove the adsorption material enriched with pathogens for subsequent molecular biology or microbiological analysis. The overall structure of the sampler and the adsorption module 400 can be cleaned and reused after the experiment.

[0042] In this embodiment, the sampler can be widely applied to various aquatic environments such as domestic sewage pipe networks, confluence points, and sewage treatment plants, enabling real-time monitoring of target pathogens around the clock and avoiding the randomness of active sampling. Its onboard adsorption material can enrich pathogens on-site, simplifying laboratory pretreatment steps and significantly reducing manpower and time costs while ensuring high accuracy.

[0043] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A membrane-based enrichment passive sampler for pathogen in domestic sewage, characterized in that, The application relates to a pathogen enrichment device, which comprises a shell, a cover matched with the shell, and a partition arranged in the shell. The partition divides the shell into at least two independent accommodating cavities, and each accommodating cavity is detachably provided with an adsorption module for enriching pathogen. The shell and the cover are assembled to form a streamlined shape.

2. The membrane-based enrichment passive sampler for pathogen in domestic wastewater according to claim 1, characterized in that: The adsorption module is a detachable sealed cabin structure.

3. The membrane-based enrichment passive sampler for pathogen in domestic wastewater according to claim 1, characterized in that: Holes are arranged on the cabin wall of the adsorption module for water body to pass through.

4. The membrane-based enrichment passive sampler for pathogen in domestic wastewater according to claim 3, characterized in that: The adsorption module is assembled by at least two components through matching structures.

5. The membrane-based enrichment passive sampler for pathogen in domestic wastewater according to claim 4, characterized in that: The partition comprises a supporting part for supporting the adsorption module, and the supporting part is configured to keep a spacing between adjacent adsorption modules.

6. The membrane-based enrichment passive sampler for pathogen in domestic wastewater according to claim 1, characterized in that: Positioning structures are arranged in the accommodating cavities for positioning the adsorption modules; the positioning structures comprise fixing seats, first positioning grooves arranged on the fixing seats, and a plurality of communication holes arranged at the bottom of the positioning grooves.

7. The membrane-based enrichment passive sampler for pathogen in domestic wastewater according to claim 1, characterized in that: The shell comprises a main body and an end cover.

8. The membrane-based enrichment passive sampler for pathogen in domestic wastewater according to claim 1, characterized in that: An installation port for installing the cover is arranged on the main body, and a fixing structure matched with the cover is arranged on the edge of the installation port.

9. The membrane-based enrichment passive sampler for pathogen in domestic wastewater according to claim 8, characterized in that: The fixing structure comprises a clamping part close to one end cover, a positioning part close to the other end cover, and a positioning part arranged at the middle position. A matching structure matched with the fixing structure is arranged on the cover.

10. The membrane-based enrichment passive sampler for pathogen in domestic sewage according to claim 9, characterized in that: The matching structure comprises a bayonet arranged at one end of the cover, and the bayonet is slidably matched with the clamping part; and a second positioning groove matched with the positioning part is further arranged. Mesh parts are arranged on the shell and the cover.

11. The membrane-based enrichment passive sampler for pathogen in domestic wastewater according to claim 1, characterized in that: ​

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