Three-stage filtration system based on membrane filtration

Abstract

The invention relates to the technical field of filtration systems, and discloses a three-stage filtration system based on membrane filtration, which comprises an electromagnetic valve control unit, a collection unit arranged on one side of the electromagnetic valve control unit, a power unit arranged on one side of the collection unit, a filtration unit arranged on one side of the power unit, and a sample treatment module arranged on one side of the filtration unit. The electromagnetic valve control unit is used for controlling a flowing path of fluid in the system; a collection unit for collecting and storing different fluids in the system; the power unit is used for providing power for flowing of the fluid; according to the device, removal of impurities in a water sample and enrichment of escherichia coli can be achieved at the same time, it can be ensured that the water sample is filtered step by step through the multiple stages of filtering assemblies, various impurities are effectively removed, it is ensured that escherichia coli is intercepted on the last fifth filtering assembly, and three electromagnetic valves and a peristaltic pump are used for controlling; the enrichment of escherichia coli can be realized, and a high-quality water sample is provided for subsequent detection.

Description

Technical Field

[0001] The invention relates to the technical field of filtration systems, in particular to a three-stage filtration system based on membrane filtration. Background Art

[0002] Currently, about half of the world's population faces severe water shortages at least part of the year. A quarter of the world's population faces "extremely high" water shortage pressures, and water utilization rates in these areas exceed 80%. As water resource problems become increasingly severe, intestinal parasitic infections and diarrheal diseases caused by waterborne pathogens have become the main causes of environmental illness and death. According to relevant WHO surveys, 80% of diseases and 50% of child deaths in the world are related to poor drinking water quality. Due to water pollution, 50 million children die each year, 35 million people suffer from cardiovascular disease, 70 million people suffer from stone disease, 90 million people suffer from hepatitis, and 30 million people die from liver cancer and gastric cancer. Since the infectious dose of most waterborne pathogens is very low, the presence of even one bacteria in the environment may pose a serious health risk. Taking E. coli as an example, according to the "National Standard of the People's Republic of China - Drinking Water Hygiene Standard", the concentration of E. coli in drinking water should be less than 1 CFU / 100mL. These strict standards require detection methods to be not only ultra-sensitive, but also quantitative and accurate.

[0003] The existing bacterial enrichment methods are cumbersome, expensive, and have low enrichment efficiency. For the plate culture method in the national standard, it often takes 16-24 hours to obtain results for enriching E. coli. Although the magnetic bead method has a high enrichment rate, its cost is much higher than the plate method. The membrane filter method is currently a relatively low-cost enrichment method, but the operation is relatively cumbersome. For this reason, a three-stage filtration system based on membrane filtration is proposed. Summary of the invention

[0004] The object of the present invention is to provide a three-stage filtration system based on membrane filtration to solve the problems raised in the above background technology.

[0005] To achieve the above object, the present invention provides the following technical solution: a three-stage filtration system based on membrane filtration, comprising a solenoid valve control unit, a collecting unit is provided on one side of the solenoid valve control unit, a power unit is provided on one side of the collecting unit, a filtration unit is provided on one side of the power unit, and a sample processing module is provided on one side of the filtration unit;

[0006] The solenoid valve control unit is used to control the flow path of the fluid in the system;

[0007] The collecting unit is used to collect and store different fluids in the system;

[0008] The power unit is used to provide power for the flow of the fluid;

[0009] The filtering unit is used to achieve step-by-step filtering from coarse filtration to fine filtration;

[0010] The sample processing module is used to process and guide the sample fluid;

[0011] The solenoid valve control unit includes a first solenoid valve, a second solenoid valve and a third solenoid valve;

[0012] The collection unit includes a cleaning liquid bottle, a bacterial liquid collection bottle, a sample bottle and a waste liquid bottle;

[0013] The power unit comprises a first peristaltic pump, a second peristaltic pump, a third peristaltic pump, a fourth peristaltic pump, a fifth peristaltic pump and a sixth peristaltic pump;

[0014] The filter unit includes a first filter component, a second filter component, a third filter component, a fourth filter component and a fifth filter component.

[0015] Preferably, the first solenoid valve, the second solenoid valve and the third solenoid valve are all provided with a first port, a second port and a third port.

[0016] Preferably, the sample processing module comprises an upper bracket and a lower bracket, flow channels are provided inside the upper bracket and the lower bracket, and a filter membrane is provided between the upper bracket and the lower bracket.

[0017] Preferably, as mentioned above: a sample liquid inlet and an enriched liquid outlet connected to the flow channel are respectively opened on the top of the upper support.

[0018] Preferably, as mentioned above: a waste liquid outlet connected to the flow channel is opened on one side of the bottom of the lower bracket.

[0019] Preferably, the liquid outlet of the cleaning liquid bottle is connected to the first port of the first solenoid valve, the second port of the first solenoid valve is connected to the first port of the second solenoid valve, and the third port of the first solenoid valve is connected to the liquid inlet of the bacteria liquid collection bottle.

[0020] Preferably, the above: the second port of the second solenoid valve is connected to the third port of the third solenoid valve, the third port of the second solenoid valve is connected to the liquid inlet end of the sample bottle, the first port of the third solenoid valve is respectively connected to the fourth filter assembly and one end of the fifth peristaltic pump, and the second port of the third solenoid valve is connected to one end of the fifth filter assembly.

[0021] Preferably, the liquid outlet of the sample bottle is connected to a first peristaltic pump, the liquid outlet of the first peristaltic pump is connected to a first filter component, the liquid outlet of the first filter component is connected to a second peristaltic pump, the liquid outlet of the second peristaltic pump is connected to a second filter component, and the liquid outlet of the second filter component is connected to a third peristaltic pump.

[0022] Preferably, the above-mentioned: the liquid outlet end of the third peristaltic pump is connected to the third filter component, the liquid outlet end of the third filter component is connected to the fourth peristaltic pump, the liquid outlet end of the fourth peristaltic pump is connected to the fourth filter component, the liquid outlet end of the fourth filter component is connected to the liquid level sensor, and the liquid outlet end of the liquid level sensor is connected to the liquid inlet end of the fifth peristaltic pump.

[0023] Preferably, the liquid outlet of the fifth peristaltic pump is connected to the fifth filter assembly, the liquid outlet of the fifth filter assembly is connected to the sixth peristaltic pump, and the liquid outlet of the sixth peristaltic pump is connected to a waste liquid bottle.

[0024] Compared with the prior art, the present invention adopts the above technical solution and has the following technical effects:

[0025] 1. The present invention can simultaneously achieve the removal of impurities and the enrichment of E. coli in water samples. The multi-stage filtration component can ensure that the water sample is filtered step by step to effectively remove various impurities, while ensuring that E. coli is retained on the last fifth filtration component. The three solenoid valves and peristaltic pump control can achieve the enrichment of E. coli and provide high-quality water samples for subsequent testing.

[0026] 2. By controlling the solenoid valve and peristaltic pump, the system can ensure that the remaining liquid in the pipeline circulates in the fifth filter component, continuously flushing the upper surface of the filter membrane, so that the previously trapped E. coli returns to the liquid, thereby achieving a high enrichment rate. The multi-stage filter component can effectively prevent clogging and extend its service life. At the same time, through circulating flushing and enrichment operations, the risk of clogging can be further reduced, allowing the system to be used multiple times and reducing maintenance costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0028] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0029] Figure 2 It is a schematic diagram of the flow channel distribution structure of the present invention;

[0030] Figure 3 It is a schematic diagram of the structure of the sample processing module of the present invention;

[0031] Figure 4 It is a schematic diagram of the front cross-sectional structure of the sample processing module of the present invention.

[0032] Explanation of the reference numerals: 101, first solenoid valve; 102, second solenoid valve; 103, third solenoid valve; 201, cleaning liquid bottle; 202, bacterial liquid collection bottle; 203, sample bottle; 204, waste liquid bottle; 301, first peristaltic pump; 302, second peristaltic pump; 303, third peristaltic pump; 304, fourth peristaltic pump; 305, fifth peristaltic pump; 306, sixth peristaltic pump; 401, liquid level sensor; 501, first filter component; 502, second filter component; 503, third filter component; 504, fourth filter component; 505, fifth filter component; 601, upper bracket; 602, lower bracket; 603, sample liquid inlet; 604, waste liquid outlet; 605, enriched liquid outlet; 606, flow channel; 607, filter membrane. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. 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 creative work are within the scope of protection of the present invention.

[0034] It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the conditions under which this application can be implemented. Therefore, they have no substantive technical significance. Any structural modification, change in proportional relationship or adjustment of size should still fall within the scope of the technical content disclosed in this application without affecting the effects and purposes that can be achieved by this application.

[0035] Example

[0036] See also Figure 1-4 , the present invention provides a technical solution: a three-stage filtration system based on membrane filtration, comprising a solenoid valve control unit, a collecting unit is provided on one side of the solenoid valve control unit, a power unit is provided on one side of the collecting unit, a filtering unit is provided on one side of the power unit, and a sample processing module is provided on one side of the filtering unit;

[0037] The solenoid valve control unit is used to control the flow path of the fluid in the system; the solenoid valve control unit includes a first solenoid valve 101, a second solenoid valve 102 and a third solenoid valve 103; the first solenoid valve 101, the second solenoid valve 102 and the third solenoid valve 103 are all provided with a first port, a second port and a third port.

[0038] A collecting unit, used to collect and store different fluids in the system; the collecting unit includes a cleaning liquid bottle 201, a bacterial liquid collection bottle 202, a sample bottle 203 and a waste liquid bottle 204;

[0039] A power unit is used to provide power for the flow of fluid; the power unit includes a first peristaltic pump 301, a second peristaltic pump 302, a third peristaltic pump 303, a fourth peristaltic pump 304, a fifth peristaltic pump 305 and a sixth peristaltic pump 306. The three solenoid valves and the peristaltic pump control can achieve the enrichment of Escherichia coli and provide high-quality water samples for subsequent detection;

[0040] The filtration unit is used to achieve step-by-step filtration from coarse filtration to fine filtration; the filtration unit includes a first filtration component 501, a second filtration component 502, a third filtration component 503, a fourth filtration component 504 and a fifth filtration component 505. The filter membrane 607 of the first filtration component 501 is 100 μm, the filter membrane 607 of the second filtration component 502 is 50 μm, the filter membrane 607 of the third filtration component 503 is 20 μm, the filter membrane 607 of the fourth filtration component 504 is 10 μm, and the filter membrane 607 of the fifth filtration component 505 is 0.2 μm. The multi-stage filtration component can ensure that the water sample is filtered step by step to effectively remove various impurities, while ensuring that Escherichia coli is retained on the last fifth filtration component 505.

[0041] The sample processing module is used to process and guide the sample fluid; the sample processing modules are respectively installed on the inner sides of the first filter component 501, the second filter component 502, the third filter component 503, the fourth filter component 504 and the fifth filter component 505. The sample processing module includes an upper bracket 601 and a lower bracket 602. The inner sides of the upper bracket 601 and the lower bracket 602 are both provided with flow channels 606. A filter membrane 607 is provided between the upper bracket 601 and the lower bracket 602. A sample liquid inlet 603 and an enriched liquid outlet 605 connected to the flow channel 606 are respectively provided on the top of the upper bracket 601. By controlling the solenoid valve and the peristaltic pump, the system can ensure that the remaining liquid in the pipeline circulates in the fifth filter component 505, continuously flushing the upper surface of the filter membrane 607, so that the previously trapped Escherichia coli returns to the liquid. A waste liquid outlet 604 connected to the flow channel 606 is provided on one side of the bottom of the lower bracket 602.

[0042] The liquid outlet end of the cleaning liquid bottle 201 is connected to the first port of the first solenoid valve 101, the second port of the first solenoid valve 101 is connected to the first port of the second solenoid valve 102, the third port of the first solenoid valve 101 is connected to the liquid inlet end of the bacteria liquid collection bottle 202, the second port of the second solenoid valve 102 is connected to the third port of the third solenoid valve 103, the third port of the second solenoid valve 102 is connected to the liquid inlet end of the sample bottle 203, the first port of the third solenoid valve 103 is respectively connected to the fourth filter component 504 and one end of the fifth peristaltic pump 305, and the second port of the third solenoid valve 103 is connected to one end of the fifth filter component 505.

[0043] The liquid outlet of the sample bottle 203 is connected to the first peristaltic pump 301, the liquid outlet of the first peristaltic pump 301 is connected to the first filter assembly 501, the liquid outlet of the first filter assembly 501 is connected to the second peristaltic pump 302, the liquid outlet of the second peristaltic pump 302 is connected to the second filter assembly 502, the liquid outlet of the second filter assembly 502 is connected to the third peristaltic pump 303, the liquid outlet of the third peristaltic pump 303 is connected to the third filter assembly 503, the liquid outlet of the third filter assembly 503 is connected to the fourth peristaltic pump 304, the liquid outlet of the fourth peristaltic pump 304 is connected to the fourth filter assembly 504, the liquid outlet of the fourth filter assembly 504 is connected to the liquid level sensor 401, the liquid outlet of the liquid level sensor 401 is connected to the liquid inlet of the fifth peristaltic pump 305, and the multi-stage filter assembly can effectively prevent clogging and extend the service life. At the same time, the risk of clogging can be further reduced through cyclic flushing and enrichment operations.

[0044] The liquid outlet of the fifth peristaltic pump 305 is connected to the fifth filter assembly 505 , the liquid outlet of the fifth filter assembly 505 is connected to the sixth peristaltic pump 306 , and the liquid outlet of the sixth peristaltic pump 306 is connected to the waste liquid bottle 204 .

[0045] Working principle: When it is necessary to filter impurities in water, add 100mL of sample liquid into the sample bottle 203, turn on the first peristaltic pump 301, the second peristaltic pump 302, the third peristaltic pump 303, the fourth peristaltic pump 304, the fifth peristaltic pump 305 and the sixth peristaltic pump 306, and control their speed to 50rpm / min. The first solenoid valve 101, the second solenoid valve 102 and the third solenoid valve 103 remain in the initial state. At this time, the second port of the first solenoid valve 101, the second solenoid valve 102 and the third solenoid valve 103 are connected to the third port, so that the sample liquid is drawn from the sample bottle 203 into the pipeline. Then the sample liquid passes through the first filter component 501, the second filter component 502, the third filter component 503, the fourth filter component 504 and the fifth filter component 505 in sequence, and the impurities in the sample liquid are filtered out by the first filter component 501, the second filter component 502, the third filter component 503 and the fourth filter component 504, so that the Escherichia coli is trapped on the filter membrane 607 of the last fifth filter component 505, and finally the sample enters the inner side of the waste liquid bottle 204. When the liquid level sensor 401 detects that there is no liquid flowing, the speed of all peristaltic pumps returns to 0rpm / min, and the filtering stops;

[0046] When the sample liquid enters the sample processing module, it enters from the sample inlet 603 of the upper bracket 601, passes through the flow channel 606, and is intercepted by the filter membrane 607, and flows out from the waste liquid outlet 604;

[0047] When it is necessary to enrich the E. coli in the sample liquid, the second port of the third solenoid valve 103 is controlled to be connected to the first port, the fifth peristaltic pump 305 is turned on, the controller speed is 50rpm / min, the first peristaltic pump 301, the second peristaltic pump 302, the third peristaltic pump 303, the fourth peristaltic pump 304 and the sixth peristaltic pump 306 are in a closed state, the first solenoid valve 101 and the second solenoid valve 102 maintain the initial state, so that the second port of the first solenoid valve 101 and the second solenoid valve 102 are connected to the third port, and the process ends after 3 minutes. At this time, the remaining liquid in the pipeline circulates in the pipeline and the fifth filter component 505, thereby continuously flushing the upper surface of the filter membrane 607 in the fifth filter component 505, so that the previously trapped E. coli are returned to the liquid, thereby achieving bacterial enrichment;

[0048] The remaining liquid in the pipeline flows in the fifth filter assembly 505 along the following trajectory: the liquid enters the sample inlet 603 of the upper support 601, passes through the flow channel 606, and simultaneously flushes away the E. coli trapped by the filter membrane 607, flows out from the enrichment liquid outlet 605 with the E. coli, enters from the second port of the third solenoid valve 103, and flows out from the first port of the third solenoid valve 103, and under the drive of the fifth peristaltic pump 305, returns to the sample inlet 603 of the upper support 601, and circulates multiple times in the entire pipeline;

[0049] When collecting the Escherichia coli enriched liquid, the second port of the first solenoid valve 101 is controlled to be connected to the third port, the second port of the second solenoid valve 102 is connected to the first port, the second port of the third solenoid valve 103 is connected to the third port, the fifth peristaltic pump 305 continues to keep the working state, and the speed of the fifth peristaltic pump 305 is controlled to be 50rpm / min. The remaining first peristaltic pump 301, the second peristaltic pump 302, the third peristaltic pump 303, the fourth peristaltic pump 304 and the sixth peristaltic pump 306 are all in the closed state. At this time, after the liquid flows out from the enriched liquid outlet 605, it enters through the second port of the third solenoid valve 103 and flows out from the third port of the third solenoid valve 103. The liquid reaches the second port of the second solenoid valve 102, flows out from the first port of the second solenoid valve 102, and finally reaches the second port of the first solenoid valve 101, flows out from the third port of the first solenoid valve 101, and finally the enriched liquid flows into the interior of the bacterial liquid collection bottle 202; the state of the solenoid valve and the peristaltic pump can be flexibly adjusted as needed to achieve different functions. For example, in the impurity removal stage, all peristaltic pumps are turned on and the solenoid valves remain in the initial state; in the enrichment stage, only specific peristaltic pumps and solenoid valves are turned on to achieve circulating flushing and enrichment operations.

[0050] The collection is completed after 3 minutes. At this time, the fifth filter assembly 505 and the bacterial liquid collection bottle 202 are connected, so that the enriched bacterial liquid can be discharged into the inner side of the bacterial liquid collection bottle 202, thereby realizing the collection of the E. coli enriched liquid.

[0051] In summary, the present invention can simultaneously remove impurities from water samples and enrich E. coli. The multi-stage filtration component can ensure that the water sample is filtered step by step, effectively removing various impurities, and at the same time ensuring that E. coli is retained on the last fifth filtration component 505. The three solenoid valves and peristaltic pump control can achieve the enrichment of E. coli and provide high-quality water samples for subsequent detection.

[0052] By controlling the solenoid valve and the peristaltic pump, the system can ensure that the remaining liquid in the pipeline circulates in the fifth filter assembly 505, continuously flushing the upper surface of the filter membrane 607, so that the previously trapped E. coli returns to the liquid, thereby achieving a high enrichment rate. The multi-stage filter assembly can effectively prevent clogging and extend the service life. At the same time, through the circulation flushing and enrichment operation, the risk of clogging can be further reduced, so that the system can be used multiple times and the maintenance cost can be reduced.

[0053] It will be appreciated by those skilled in the art that the features described in the various embodiments and / or claims of the present invention may be combined and / or combined in various ways, even if such combinations and / or combinations are not explicitly described in the present invention. In particular, the features described in the various embodiments and / or claims of the present invention may be combined and / or combined in various ways without departing from the spirit and teachings of the present invention. All of these combinations and / or combinations fall within the scope of the present invention.

Claims

1. A three-stage filtration system based on membrane filtration, characterized in that: It comprises an electromagnetic valve control unit, a collecting unit is provided on one side of the electromagnetic valve control unit, a power unit is provided on one side of the collecting unit, a filtering unit is provided on one side of the power unit, and a sample processing module is provided on one side of the filtering unit; The solenoid valve control unit is used to control the flow path of the fluid in the system; The collecting unit is used to collect and store different fluids in the system; The power unit is used to provide power for the flow of the fluid; The filtering unit is used to achieve step-by-step filtering from coarse filtration to fine filtration; The sample processing module is used to process and guide the sample fluid; The solenoid valve control unit comprises a first solenoid valve (101), a second solenoid valve (102) and a third solenoid valve (103); The collection unit comprises a cleaning liquid bottle (201), a bacterial liquid collection bottle (202), a sample bottle (203) and a waste liquid bottle (204); The power unit comprises a first peristaltic pump (301), a second peristaltic pump (302), a third peristaltic pump (303), a fourth peristaltic pump (304), a fifth peristaltic pump (305) and a sixth peristaltic pump (306); The filter unit comprises a first filter component (501), a second filter component (502), a third filter component (503), a fourth filter component (504) and a fifth filter component (505).

2. A three-stage filtration system based on membrane filtration according to claim 1, characterized in that: The first solenoid valve (101), the second solenoid valve (102) and the third solenoid valve (103) are each provided with a first port, a second port and a third port.

3. A three-stage filtration system based on membrane filtration according to claim 2, characterized in that: The sample processing module comprises an upper support (601) and a lower support (602), wherein flow channels (606) are provided inside the upper support (601) and the lower support (602), and a filter membrane (607) is provided between the upper support (601) and the lower support (602).

4. A three-stage filtration system based on membrane filtration according to claim 3, characterized in that: The top of the upper support (601) is provided with a sample liquid inlet (603) and an enriched liquid outlet (605) respectively connected to the flow channel (606).

5. A three-stage filtration system based on membrane filtration according to claim 4, characterized in that: A waste liquid outlet (604) connected to the flow channel (606) is provided on one side of the bottom of the lower support (602).

6. A three-stage filtration system based on membrane filtration according to claim 5, characterized in that: The liquid outlet of the cleaning liquid bottle (201) is connected to the first port of the first solenoid valve (101), the second port of the first solenoid valve (101) is connected to the first port of the second solenoid valve (102), and the third port of the first solenoid valve (101) is connected to the liquid inlet of the bacterial liquid collection bottle (202).

7. A three-stage filtration system based on membrane filtration according to claim 6, characterized in that: The second port of the second solenoid valve (102) is connected to the third port of the third solenoid valve (103), the third port of the second solenoid valve (102) is connected to the liquid inlet end of the sample bottle (203), the first port of the third solenoid valve (103) is respectively connected to the fourth filter component (504) and one end of the fifth peristaltic pump (305), and the second port of the third solenoid valve (103) is connected to one end of the fifth filter component (505).

8. A three-stage filtration system based on membrane filtration according to claim 7, characterized in that: The liquid outlet of the sample bottle (203) is connected to a first peristaltic pump (301), the liquid outlet of the first peristaltic pump (301) is connected to a first filter component (501), the liquid outlet of the first filter component (501) is connected to a second peristaltic pump (302), the liquid outlet of the second peristaltic pump (302) is connected to a second filter component (502), and the liquid outlet of the second filter component (502) is connected to a third peristaltic pump (303).

9. A three-stage filtration system based on membrane filtration according to claim 8, characterized in that: The liquid outlet of the third peristaltic pump (303) is connected to the third filter assembly (503), the liquid outlet of the third filter assembly (503) is connected to the fourth peristaltic pump (304), the liquid outlet of the fourth peristaltic pump (304) is connected to the fourth filter assembly (504), the liquid outlet of the fourth filter assembly (504) is connected to the liquid level sensor (401), and the liquid outlet of the liquid level sensor (401) is connected to the liquid inlet of the fifth peristaltic pump (305).

10. A three-stage filtration system based on membrane filtration according to claim 9, characterized in that: The liquid outlet of the fifth peristaltic pump (305) is connected to the fifth filter assembly (505), the liquid outlet of the fifth filter assembly (505) is connected to the sixth peristaltic pump (306), and the liquid outlet of the sixth peristaltic pump (306) is connected to the waste liquid bottle (204).

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