Ultrafiltration cup membrane pollution monitoring system based on diffuse reflection rate measurement

Abstract

The utility model discloses an ultrafiltration cup membrane pollution monitoring system based on diffuse reflection rate measurement, which belongs to the technical field of ultrafiltration and comprises an ultrafiltration cup, an optical fiber probe, a light source, an optical fiber spectrometer and a computer, the light source and the optical fiber spectrometer are respectively connected with the optical fiber probe, and the computer is connected with the optical fiber spectrometer. The ultrafiltration cup comprises a cup bottom and a cup body arranged above the cup bottom, a closed light-free space is formed in the cup body and the cup bottom, an optical fiber probe insertion tube is arranged in the center of the top of the cup body, and the free end of the optical fiber probe insertion tube extends to the bottom side in the cup body. According to the ultrafiltration cup membrane pollution monitoring system based on diffuse reflectance measurement, under the condition that a sample is not damaged, the diffuse reflectance of the sample is accurately measured by adopting the diffuse reflectance spectrometry, and the application of the diffuse reflectance spectrometry in the field of membrane pollution is realized.

Description

Technical Field

[0001] The utility model relates to the technical field of ultrafiltration, in particular to an ultrafiltration cup membrane pollution monitoring system based on diffuse reflectance measurement. Background Art

[0002] Nowadays, ultrafiltration technology is increasingly used in the field of drinking water treatment. However, the accompanying membrane contamination problem is still a potential problem that cannot be ignored in today's ultrafiltration process, and it is also the research focus of the future market of membrane treatment technology.

[0003] As a new UV-visible spectroscopy measurement method, diffuse reflectance can directly measure the spectrum of solid materials without changing the state of solid materials, and is suitable for direct analysis of solid samples. Different from the traditional UV-visible spectroscopy, which measures based on the principle that the absorbance of a substance is proportional to the thickness of the absorbing medium, it is generally only suitable for the analysis of liquid samples.

[0004] The principle of diffuse reflection test is that the analytical light emitted by the tester is irradiated vertically into the sample at an angle of 90°, and returns to the sample surface after multiple reflections, diffractions, refractions and absorptions. The analytical light interacts with the molecules inside the sample and carries the sample structure and composition information, which can be analyzed by the instrument to obtain the sample energy level structure and light absorption performance.

[0005] At present, UV-Vis diffuse reflectance spectroscopy has been widely used in the characterization of thin film samples, pearls, ceramic materials, paper, etc. However, although this technology has begun to be introduced into the research field of membrane pollution characterization, the corresponding detection methods and technical analysis are not mature and perfect enough.

[0006] Traditional ultrafiltration cups are sealed, non-porous and light-transmissive, and samples must be prepared before offline testing, so it is impossible to use a fiber optic spectrometer to measure samples in real time. In traditional measurement methods, pre-enrichment and elution are usually required, but in this method, the ultrafiltration membrane enriches the sample without elution and can be directly used for spectral detection.

[0007] In view of the above reasons, the utility model proposes an ultrafiltration cup membrane contamination monitoring system based on diffuse reflectance measurement to achieve offline characterization of membrane contamination. Utility Model Content

[0008] The purpose of the utility model is to provide an ultrafiltration cup membrane contamination monitoring system based on diffuse reflectance measurement. Without damaging the sample, the diffuse reflectance spectroscopy is used to accurately measure the diffuse reflectance of the sample with the help of an optical fiber probe, thereby realizing the use of diffuse reflectance spectroscopy in the field of membrane contamination.

[0009] To achieve the above object, the utility model provides an ultrafiltration cup membrane contamination monitoring system based on diffuse reflectance measurement, comprising an ultrafiltration cup, an optical fiber probe, a light source and an optical fiber spectrometer respectively connected to the optical fiber probe, and a computer connected to the optical fiber spectrometer;

[0010] The ultrafiltration cup includes a cup bottom and a cup body arranged above the cup bottom, the cup body and the inside of the cup bottom form a closed lightless space, a fiber optic probe cannula is arranged at the center of the top of the cup body, and the free end of the fiber optic probe cannula extends into the inside of the cup body.

[0011] Preferably, it further comprises an optical fiber, one end of which is connected to the optical fiber probe, and the other end of which is divided into an optical fiber input end and an optical fiber output end.

[0012] Preferably, the optical fiber input end is connected to the light source, the optical fiber output end is connected to the optical fiber spectrometer, and the signal transmission end of the optical fiber spectrometer is connected to the computer.

[0013] Preferably, the fiber optic probe is inserted into the cup body close to the inner wall of the fiber optic probe tube, and the end of the fiber optic probe away from the optical fiber contacts the sample arranged on the bottom of the cup, and the contact angle between the fiber optic probe and the sample is 90°.

[0014] Preferably, the cup body and the cup bottom are connected via threads.

[0015] Preferably, the cup body and the cup bottom are both made of black, opaque photosensitive resin material.

[0016] Therefore, the utility model adopts an ultrafiltration cup membrane contamination monitoring system based on diffuse reflectance measurement with the above structure, which can be used to measure samples that are not suitable for sample preparation using a cuvette, including ultrafiltration membranes, mud, etc. The use of this ultrafiltration cup can achieve accurate diffuse reflectance measurement of samples by using diffuse reflectance spectroscopy with the help of an optical fiber probe coupled to an optical fiber spectrometer without damaging the sample, thereby realizing the application of diffuse reflectance spectroscopy in the field of membrane contamination and offline monitoring during sample processing, creating a precedent for diffuse reflection and membrane contamination detection.

[0017] The technical solution of the utility model is further described in detail below through the accompanying drawings and embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a structural schematic diagram of an embodiment of an ultrafiltration cup membrane contamination monitoring system based on diffuse reflectance measurement of the utility model;

[0019] Figure 2 This is a schematic diagram of the structure of the ultrafiltration cup of the utility model;

[0020] Figure 3 This is a top view of the ultrafiltration cup of the utility model;

[0021] Figure 4 This is a schematic diagram of the cup body of the ultrafiltration cup of the utility model;

[0022] Figure 5 This is a cross-sectional view of the cup body of the ultrafiltration cup of the utility model;

[0023] Reference numerals

[0024] 1. Ultrafiltration cup; 11. Cup body; 12. Cup bottom; 13. Fiber optic probe tube; 2. Fiber optic probe; 3. Light source; 4. Fiber optic spectrometer; 5. Computer; 6. Fiber optic input end; 7. Fiber optic output end. DETAILED DESCRIPTION

[0025] The technical solution of the utility model is further described below through the accompanying drawings and embodiments.

[0026] Unless otherwise defined, the technical terms or scientific terms used in the present invention shall have the usual meanings understood by persons with ordinary skills in the field to which the present invention belongs. The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different components. Words such as "include" or "comprise" and the like mean that the elements or objects appearing before the word include the elements or objects listed after the word and their equivalents, without excluding other elements or objects. Words such as "connect" or "connected" and the like are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0027] Example

[0028] The technical solutions in the embodiments of the present utility model will be described clearly and completely below in conjunction with the accompanying drawings.

[0029] like Figure 1-5As shown, an ultrafiltration cup membrane contamination monitoring system based on diffuse reflectance measurement includes an ultrafiltration cup 1, an optical fiber probe 2, a light source 3 and an optical fiber spectrometer 4 respectively connected to the optical fiber probe 2, and a computer 5 connected to the optical fiber spectrometer 4; the ultrafiltration cup 1 includes a cup bottom 12 and a cup body 11 arranged above the cup bottom 12, the cup body 11 is cylindrical, and the cup body 11 and the cup bottom 12 form a closed lightless space inside to eliminate the influence of ambient light, and diffuse reflection detection can be performed without any treatment of the sample, and an optical fiber probe cannula 13 is arranged at the center of the top of the cup body 11, and the free end of the optical fiber probe cannula 13 extends to the inside of the cup body 11. The optical fiber probe 2 is inserted into the cup body 11 close to the inner wall of the optical fiber probe cannula 13, the surface of the cup bottom 12 is a plane, and the end of the optical fiber probe 2 away from the optical fiber contacts the sample arranged on the cup bottom 12, so as to measure the diffuse reflectance of the sample, and the contact angle between the optical fiber probe 2 and the sample is 90°. The diameter of the optical fiber probe tube 13 is consistent with that of the optical fiber probe 2 , so that the optical fiber probe 2 and the optical fiber probe tube 13 fit tightly together, ensuring that the cup body 11 is a closed and light-free environment.

[0030] It also includes an optical fiber, one end of which is connected to the optical fiber probe 2, and the other end is divided into an optical fiber input end 6 and an optical fiber output end 7. The optical fiber input end 6 is connected to the light source 3, the optical fiber output end 7 is connected to the optical fiber spectrometer 4, and the signal transmission end of the optical fiber spectrometer 4 is connected to the computer 5.

[0031] The cup bottom 12 is a spiral cup bottom 12 , and is connected to the bottom of the cup body 11 by a thread, and can be rotated and tightened to prevent water leakage, thereby achieving a detachable sealed connection between the cup bottom 12 and the cup body 11 .

[0032] Due to the detection environment requirements of diffuse reflectivity, the cup body 11 and the cup bottom 12 are both made of black, opaque photosensitive resin material.

[0033] During specific use, the PVDF ultrafiltration membrane is installed on the cup bottom 12 of the ultrafiltration cup 1, and then the cup bottom 12 and the cup body 11 are rotated and tightened, and then 150 ml of diluted algae liquid is added to the cup body 11 (the present embodiment takes algae liquid as an example, and other samples that need to be tested for membrane contamination can also be used), and the optical fiber probe 2 is inserted into the cup body 11 close to the inner wall of the optical fiber probe tube 13, and contacts with the algae liquid sample located on the cup bottom 12. The contact angle between the optical fiber probe 2 and the algae liquid sample is 90°, and the optical fiber spectrometer 4 and the computer 5 are started. The excitation light and emission light wavelengths of the optical fiber spectrometer 4 are set to two groups of parameters, one group of excitation light wavelengths are set to 400nm, and the emission light wavelength is set to 450nm; the other group of excitation light wavelengths are set to 610nm, and the emission light wavelength is set to 660nm. The excitation light and emission light slit widths are both set to 5nm, the recording time interval is 5s, and the data points are set to 5000. The pollutants on the ultrafiltration membrane only include phycocyanin, EOM, etc., wherein the excitation wavelength of membrane scattering is 400nm, and the emission wavelength is 450nm; the excitation wavelength of algae cell components is 610nm, and the emission wavelength is 660nm. The excitation light emitted by the excitation light source 3 on the light source 3 enters the optical fiber input end 6, and is irradiated onto the ultrafiltration membrane through the optical fiber probe 2. The excitation light is emitted from the optical fiber output end 7, and is connected to the computer 5 after entering the receiving end of the optical fiber spectrometer 4. The data obtained by the computer 5 is analyzed and processed, and the diffuse reflection data is obtained. After analysis, it is concluded that as the algae increase, the excitation light and emission light of the ultrafiltration membrane show a continuous downward trend, and the excitation light position of the algae decreases faster, while the emission light position decreases relatively slowly; if the scattered light at 400nm / 450nm can be used to measure the general membrane pollution, if the 610nm / 660nm decreases faster than the 400nm / 450nm, it can be judged that there is algae pollution.

[0034] Therefore, the utility model adopts the above-mentioned structure to monitor the ultrafiltration cup membrane pollution based on diffuse reflectance measurement. Without damaging the sample, the diffuse reflectance spectroscopy is used to accurately measure the diffuse reflectance of the sample, thereby realizing the application of diffuse reflectance spectroscopy in the field of membrane pollution.

[0035] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model rather than to limit it. Although the utility model has been described in detail with reference to the preferred embodiments, ordinary technicians in this field should understand that they can still modify or replace the technical solution of the utility model with equivalents, and these modifications or equivalent replacements cannot cause the modified technical solution to deviate from the spirit and scope of the technical solution of the utility model.

Claims

1. An ultrafiltration cup membrane contamination monitoring system based on diffuse reflectance measurement, characterized in that: It includes an ultrafiltration cup, an optical fiber probe, a light source and an optical fiber spectrometer respectively connected to the optical fiber probe, and a computer connected to the optical fiber spectrometer; The ultrafiltration cup includes a cup bottom and a cup body arranged above the cup bottom, the cup body and the inside of the cup bottom form a closed lightless space, a fiber optic probe cannula is arranged at the center of the top of the cup body, and the free end of the fiber optic probe cannula extends into the inside of the cup body.

2. The ultrafiltration cup membrane contamination monitoring system based on diffuse reflectance measurement according to claim 1 is characterized in that: It also includes an optical fiber, one end of which is connected to the optical fiber probe, and the other end of which is divided into an optical fiber input end and an optical fiber output end.

3. The ultrafiltration cup membrane contamination monitoring system based on diffuse reflectance measurement according to claim 2 is characterized in that: The optical fiber input end is connected to the light source, the optical fiber output end is connected to the optical fiber spectrometer, and the signal transmission end of the optical fiber spectrometer is connected to the computer.

4. The ultrafiltration cup membrane contamination monitoring system based on diffuse reflectance measurement according to claim 1 is characterized in that: The optical fiber probe is inserted into the cup body closely against the inner wall of the optical fiber probe tube, and one end of the optical fiber probe away from the optical fiber contacts the sample arranged on the bottom of the cup, and the contact angle between the optical fiber probe and the sample is 90°.

5. The ultrafiltration cup membrane contamination monitoring system based on diffuse reflectance measurement according to claim 1 is characterized in that: The cup body is connected to the cup bottom via threads.

6. The ultrafiltration cup membrane contamination monitoring system based on diffuse reflectance measurement according to claim 1 is characterized in that: The cup body and the cup bottom are both made of black, opaque photosensitive resin material.

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