Convenient water flux tester

Abstract

The utility model discloses a convenient water flux tester which comprises a first conducting hose, a peristaltic pump, a second conducting hose, a pressure gauge, a third conducting hose and a filter, one end of the first conducting hose extends into liquid to be tested, and the other end of the first conducting hose is connected with an inlet of the peristaltic pump; an outlet of the peristaltic pump is connected with a second conducting hose, and the other end of the second conducting hose is connected with a pressure gauge; the other end of the pressure gauge is connected with a third conducting hose which is connected with a filter; and a membrane to be detected is placed in the filter. According to the utility model, the water fluxes of different membrane materials can be conveniently and quickly tested, an accurate water flux value can be obtained through simple calculation, and the water flux testing device has the advantages of convenience in operation, easiness in carrying, wide application range and the like.

Description

Technical Field

[0001] This utility model relates to the field of experimental instruments, and further to the field of membrane separation technology, specifically to a convenient water flux measuring instrument. Background Technology

[0002] Membrane separation technology boasts advantages such as safety, high efficiency, energy saving, and environmental friendliness, and has been widely used in fields such as gas purification, feed-liquid separation, wastewater treatment, seawater desalination, and material recovery. The development and production of high-flux, high-selectivity, low-cost, and long-life membrane materials has become a hot topic of competition in the industry, which also places higher demands on the performance testing processes and instruments for related membrane materials. Among the various performance indicators of membranes, water flux is a fundamental performance parameter of membrane materials, providing a direct way to measure and compare membrane permeation efficiency. Water flux refers to the volume of water passing through a unit membrane area per unit time under unit pressure, representing the membrane's water production capacity per unit time.

[0003] The core of membrane separation technology lies in the detection and characterization of properties such as water flux of membrane materials. Traditional water flux testing instruments for membrane materials, such as the GAOO PWF-20 water flux meter and the Moist-HG50-1N high-pressure membrane flux meter, have the following limitations: 1. They are expensive and the equipment is complex and bulky; 2. The operation process is cumbersome and time-consuming; 3. They are only suitable for clean single-phase fluids, and it is difficult to accurately control the water flow rate, resulting in inaccurate measurement results; 4. The types of media being tested and the working conditions of the media are greatly limited.

[0004] In view of the aforementioned limitations of traditional water flux measuring instruments, this utility model proposes a convenient water flux measuring instrument. It has the following characteristics: 1. The required equipment is inexpensive; 2. The equipment is simple to assemble, convenient to operate, and saves time and effort; 3. It has a wide range of applications, can measure various solutions, and provides accurate measurement results; 4. The equipment is not restricted by the operating environment and is easy to carry. Summary of the Invention

[0005] This invention provides a convenient water flux measuring instrument to solve the problems of cumbersome operation and bulky instruments in traditional instruments. This invention is low in cost, simple to use, easy to assemble, easy to operate, and has a wide range of applications. It can solve the problems of high cost, complex equipment, difficult assembly, cumbersome operation, and difficulty in carrying traditional water flux testing devices.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] A convenient water flux measuring instrument includes a first connecting hose (2), a peristaltic pump (3), a second connecting hose (4), a pressure gauge (5), a third connecting hose (6), a filter (7), and a membrane to be tested (8). The inlet of the peristaltic pump (3) is connected to the first connecting hose (2), the outlet of the peristaltic pump (3) is connected to the inlet of the pressure gauge (5) through the second connecting hose (4), and the outlet of the pressure gauge (5) is connected to the inlet of the filter (7) through the third connecting hose (6).

[0008] The membrane to be tested (8) is embedded in the filter (7), and the membrane to be tested (8) is replaceable.

[0009] The peristaltic pump (3) has adjustable flow rate and bidirectional drive function.

[0010] The beneficial effects of this utility model are:

[0011] 1. This utility model uses a peristaltic pump to adjust the rotation speed to precisely control the flow rate, which can achieve continuous and stable flow rate control and significantly improve the accuracy and reliability of water flux measurement results.

[0012] 2. The device is easy to operate. Simply adjust the speed knob and select the working mode. A single person can complete the water flux test under different conditions. Compared with traditional measurement methods, it is faster and more convenient, saving time and labor costs.

[0013] 3. The peristaltic pump has adjustable flow rate and bidirectional drive function, which can realize multiple working modes and cleaning functions. It not only improves the practicality and adaptability of the device, but also effectively maintains the device and extends its service life.

[0014] 4. The device of this utility model has a simple structure, low cost, and is easy to promote and apply in laboratories and production fields, providing an efficient and convenient solution for the accurate measurement of water flux. Attached Figure Description

[0015] Figure 1 This is a schematic diagram of the overall structure of this utility model.

[0016] The following are the labels in the attached diagram: 1-Test liquid; 2-First connecting hose; 3-Peristaltic pump; 4-Second connecting hose; 5-Pressure gauge; 6-Third connecting hose; 7-Filter; 8-Test membrane; 9-Receiver bottle.

[0017] Figure 2 The graph shows the water flux and rejection rate of 4-chlorophenol aqueous solution tested by nanofiltration membranes with different proportions.

[0018] The following figures illustrate the following: (a) UV absorbance before and after filtration of 4-chlorophenol aqueous solution using a 9:1 PMMA / PEG blend nanofiltration membrane; (b) PMMA / PEG ratio of 8.5:1.5; (c) PMMA / PEG ratio of 8:2; (d) PMMA / PEG ratio of 7.5:2.5; (e) PMMA / PEG ratio of 7:3; (f) Water flux and rejection rate of 4-chlorophenol aqueous solution using five different blend nanofiltration membrane ratios.

[0019] Figure 3 The graph shows the water flux and rejection rate of 2,4-dichlorophenol aqueous solution tested by nanofiltration membranes with different proportions.

[0020] The following figures illustrate the following: (a) UV absorbance before and after filtration of 2,4-dichlorophenol aqueous solution using a 9:1 PMMA / PEG blended nanofiltration membrane; (b) PMMA / PEG ratio of 8.5:1.5; (c) PMMA / PEG ratio of 8:2; (d) PMMA / PEG ratio of 7.5:2.5; (e) PMMA / PEG ratio of 7:3; (f) Water flux and rejection rate of 2,4-dichlorophenol aqueous solution using five different blended nanofiltration membranes. Detailed Implementation

[0021] To make the objectives, technical solutions, and advantages of this utility model clearer, the present utility model will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain this utility model and are not intended to limit this utility model.

[0022] In the description of this utility model, it should be understood that the terms "entrance" and "exit" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or component referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model.

[0023] like Figure 1As shown, the implementation method of this utility model is as follows: 1. Preparation: Install the membrane to be tested inside the filter, ensuring that the installation is firm and the seal is good. Put a certain amount of the liquid to be tested (such as water) into the container of the liquid to be tested, place the first conductive hose (2) below the surface of the liquid to be tested, and place the filtrate receiving bottle in a suitable position below the filter. 2. Start the device: Turn on the switch of the peristaltic pump and select the working mode (constant flow rate mode or variable flow rate mode) according to the experimental requirements. 3. Flow rate setting: If the constant flow rate mode is selected, set the required flow rate through the speed adjustment knob, for example, set it to X revolutions / minute (determined according to the specific experimental requirements). The peristaltic pump will draw the liquid to be tested according to the set number of revolutions. If the variable flow rate mode is selected, set the corresponding speed change program according to the flow rate change law of the experimental design. Under a specific pressure, the peristaltic pump will automatically adjust the number of revolutions according to the program. 4. Measurement process: The liquid to be tested is filtered through the membrane to be tested under the action of the peristaltic pump and flows into the filtrate receiving bottle. During the measurement process, the pressure gauge readings are monitored in real time, and the peristaltic pump speed is adjusted appropriately according to pressure changes to ensure stable measurement. Simultaneously, the liquid volume V (unit: L) flowing into the filtrate receiving bottle per unit time, the filtration time t (unit: h), the membrane pressure P (unit: bar), and the effective filtration area S (unit: m²) of the membrane under test are recorded. 5. Calculate water flux: Calculate the water flux J (unit: L / (m²·h·bar)) using the formula J = V / (S×t×P). 6. Clean the device: After the measurement is completed, press the forward / reverse control button to reverse the peristaltic pump and flush the pipes and filter for Y minutes (determined according to actual conditions) to keep the device clean and prepare for the next measurement.

[0024] Specific Implementation Example 1: As shown in the example Figure 1 Assemble the portable water flux measuring instrument as shown. Clean the instrument with pure water in a clockwise-counterclockwise-clockwise sequence. After cleaning, drain the water from the instrument. Then, install blended nanofiltration membranes with PMMA / PEG ratios of 9:1, 8.5:1.5, 8:2, 7.5:2.5, and 7:3 into the filter. Use a stopwatch to time the process and record the pressure on the pressure gauge. Measure the volume of the solution in the receiving bottle using a graduated cylinder. Measure the absorbance of the 4-chlorophenol aqueous solution before and after filtration using UV-Vis spectroscopy. Calculate the water flux and rejection rate of the blended nanofiltration membrane for the 4-chlorophenol aqueous solution using the formula.

[0025] Specific Implementation Example 2: As shown in the example Figure 1Assemble the portable water flux measuring instrument as shown. Clean the instrument with pure water in a clockwise-counterclockwise-clockwise sequence. After cleaning, drain the water from the instrument. Then, install blended nanofiltration membranes with PMMA / PEG ratios of 9:1, 8.5:1.5, 8:2, 7.5:2.5, and 7:3 into the filter. Use a stopwatch to time the process and record the pressure on the pressure gauge. Measure the volume of the solution in the receiving bottle using a graduated cylinder. Measure the absorbance of the 2,4-dichlorophenol aqueous solution before and after filtration using UV-Vis spectroscopy. Calculate the water flux and rejection rate of the blended nanofiltration membrane for the 2,4-dichlorophenol aqueous solution using the formula.

Claims

1. A convenient water flux measuring instrument, comprising a first connecting hose (2), a peristaltic pump (3), a second connecting hose (4), a pressure gauge (5), a third connecting hose (6), a filter (7), and a membrane to be tested (8), characterized in that, The inlet of the peristaltic pump (3) is connected to the first connecting hose (2), the outlet of the peristaltic pump (3) is connected to the inlet of the pressure gauge (5) through the second connecting hose (4), and the outlet of the pressure gauge (5) is connected to the inlet of the filter (7) through the third connecting hose (6).

2. The convenient water flux measuring instrument as described in claim 1, characterized in that, The membrane to be tested (8) is embedded in the filter (7).

3. The convenient water flux measuring instrument as described in claim 2, characterized in that, The test membrane (8) can be replaced.

4. The convenient water flux measuring instrument as described in claim 1, characterized in that, The peristaltic pump (3) has adjustable flow rate and bidirectional drive function.

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