CN214312321U - Forward osmosis membrane water treatment teaching experiment device - Google Patents
Forward osmosis membrane water treatment teaching experiment device Download PDFInfo
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- CN214312321U CN214312321U CN202120630733.9U CN202120630733U CN214312321U CN 214312321 U CN214312321 U CN 214312321U CN 202120630733 U CN202120630733 U CN 202120630733U CN 214312321 U CN214312321 U CN 214312321U
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Abstract
A teaching experiment device for forward osmosis membrane water treatment comprises a raw material liquid measuring cup, a drawing liquid measuring cup, a peristaltic pump I, a peristaltic pump II and a membrane assembly, wherein the membrane assembly is composed of a forward osmosis membrane and a clamp thereof, the raw material liquid measuring cup, the peristaltic pump I and a membrane chamber cavity on one side of the membrane assembly form a loop, the drawing liquid measuring cup, the peristaltic pump II and a membrane chamber cavity on the other side of the membrane assembly form a loop, the peristaltic pump I is connected with a conductivity meter I and a photometer, the peristaltic pump II is connected with a conductivity meter II and a pressure meter, an electronic balance is arranged under the raw material liquid measuring cup in an auxiliary mode, and each measuring device is connected with a computer. The invention adopts a self-circulating draw solution processing mode, and learns and masters the working principle of the forward osmosis membrane by real-time data acquisition of multiple factors such as salinity, luminosity, water pressure, water temperature, flow and the like on two sides of the FO membrane through osmotic volume and mass change. The device and equipment structure designed by human engineering accords with the requirements of teaching experiments on opening all parameters, intuitive operation, obvious effect explanation, safety, low consumption and efficient space utilization.
Description
Technical Field
The invention belongs to the technical field of environment-friendly and chemical engineering teaching devices, and particularly relates to a forward osmosis membrane water treatment teaching experimental device.
Background
Forward osmosis is a natural phenomenon in which water molecules flow through a semipermeable membrane from a place where chemical potential is high to a place where chemical potential is low by the osmotic pressure of a salt solution. And water molecules in the low-concentration raw material liquid are obtained by using the high-concentration drawing liquid, so that the concentration and reduction treatment and treatment of the sewage are realized. The forward osmosis technology is a new low-carbon green technology and new material technology, and the unique low cost of the forward osmosis technology becomes a research hotspot of membrane technology materials in the 21 st century. The technology has the advantages of low energy consumption, low working pressure, low pollution, zero emission and the like, can be applied to a plurality of fields such as seawater desalination, drinking water purification, landfill leachate treatment, plant extract concentration, agricultural fertilizer water irrigation and utilization and the like in social production practice, and has important market economic value in the aspect of water quality desalination treatment technology.
The forward osmosis membrane technical device on the market at present has numerous and complicated application processes, and particularly, the forward osmosis membrane technical device needs special technical process and space obstacle to guarantee the concentrated water of the drawing liquid with high osmotic pressure, and is difficult to apply to classroom experiment teaching.
Disclosure of Invention
In order to overcome the defects of the prior art, the invention aims to provide a teaching experimental device for water treatment of a forward osmosis membrane, wherein a raw material solution and a drawing solution are respectively and continuously driven by a pump on two surfaces of a membrane component, forward osmosis change of water is generated due to different osmotic pressures, and indication is displayed by an electronic balance, so that the reduction treatment of the concentration of the raw material solution is realized. The invention has small volume, good mobility, visibility and open and adjustable operation parameters; the replacement of part liquid is convenient, the data display is clear and visual, and the method is suitable for teaching experiment application. Can meet the teaching experiment requirements in the school time. And, the experimental effect is showing, and desk-top design takes up an area of the space for a short time, and is safe high-efficient, has reached the purpose and the requirement of experiment teaching.
In order to achieve the purpose, the invention adopts the technical scheme that:
the utility model provides a teaching experiment device is handled to forward osmosis membrane water, includes raw materials liquid graduated flask 9, draws liquid graduated flask 10, peristaltic pump 1, peristaltic pump two 2 and membrane module 11, membrane module 11 comprises forward osmosis membrane and anchor clamps thereof, its characterized in that, raw materials liquid graduated flask 9, peristaltic pump 1 and one side diaphragm chamber cavity formation return circuit of membrane module 11, draw liquid graduated flask 10, peristaltic pump two 2 and the opposite side diaphragm chamber cavity formation return circuit of membrane module 11, peristaltic pump 1 is connected with conductometer 3 and photometer 5, peristaltic pump two 2 is connected with conductometer two 4 and pressure gauge 6, raw materials liquid graduated flask 9 is assisted and is equipped with electronic balance 7 down, conductometer 3, photometer 5, conductometer two 4, pressure gauge 6 and electronic balance 7 all connect computer 12.
The draw solution measuring cup 10 is provided with a magnetic stirrer 8.
The forward osmosis membrane can be made into a flat plate type or hollow fiber shape, the membrane component 11 is detachable, and a cavity of one side of the membrane component and a cavity of the other side of the membrane component are respectively provided with an outlet and an inlet.
The device integrally adopts a door-shaped frame structure, the membrane component 11 is positioned in the middle of the cross beam, the peristaltic pump I1 and the peristaltic pump II 2 are symmetrically positioned at two sides of the membrane component 11, and the raw material liquid measuring cup 9 and the liquid drawing cup 10 are respectively positioned in the operating space below the cross beam.
The invention also provides an experimental method using the forward osmosis membrane water treatment teaching experimental device, which adopts a working mode of fixed-volume self-circulation liquid drawing and comprises the following steps:
a peristaltic pump I1 sucks raw material liquid from a raw material liquid measuring cup 9 and sends the raw material liquid into a cavity (50x100 x 3mm) of a membrane chamber at one side of a membrane module 11, water molecules of the raw material liquid permeate from the cavity of the membrane chamber at one side to the cavity of the membrane chamber at the other side through a forward osmosis membrane, and the raw material liquid in the cavity of the membrane chamber at one side continuously flows to the raw material liquid measuring cup 9 in a circulating manner;
the peristaltic pump II 2 sucks the draw solution from the draw solution measuring cup 10 and sends the draw solution into a cavity (50x100 x 3mm) of the membrane module 11 at the other side of the membrane chamber, and the draw solution in the cavity of the membrane chamber at the other side and water molecules permeating through the forward osmosis membrane circulate and continuously flow to the draw solution measuring cup 10;
lasting for 1-2 hours, regularly collecting the conductance, luminosity, water pressure and flow at two sides of the forward osmosis membrane and the measurement data of the electronic balance 7 in the process, and transmitting the data to the computer 12.
The drawing liquid measuring cup 10 is provided with a magnetic stirrer 8 for self-circulation stirring and mixing.
The salinity (osmotic pressure) of the draw solution is higher than that of the raw material solution.
Compared with the prior art, the device has a door-shaped structure, is concise and intuitive, and is convenient for replacing the water containing measuring cup; the parts are convenient to detach and take, the overall design is compact, and the movement is convenient. The acrylic material is attractive and transparent, the practical safety performance is high, the flow principle is clear, and the acrylic material is suitable for auxiliary teaching, is helpful for students to understand the principle and master the latest science and technology; meanwhile, the raw material liquid and the drawing liquid are completely internally circulated, are zero and are not discharged externally, and the experimental effect is remarkable; in the using process of the device, the data of the conductivity meter, the photometer and the pressure meter can be transmitted to a computer in real time, so that manual operation is reduced, and the device is suitable for analysis, comparison, statistics and research; the device can be widely used for principle demonstration display and classroom experiment teaching of process methods, and can also be used as a scientific research platform.
Drawings
FIG. 1 is a schematic diagram of the present invention.
FIG. 2 is a diagram showing the variation of parameters of the raw material liquid according to the present invention.
Fig. 3 is a graph plotting the change in conductivity according to the present invention.
Detailed Description
The embodiments of the present invention will be described in detail below with reference to the drawings and examples.
As shown in figure 1, the forward osmosis membrane water treatment teaching experimental device integrally adopts a door-shaped frame structure, and the door-shaped open design is more favorable for observation and real-time operation in the experimental teaching process. The device comprises a raw material liquid measuring cup 9, a liquid drawing cup 10, a peristaltic pump I1, a peristaltic pump II 2 and a membrane assembly 11, wherein the membrane assembly 11 is detachable and comprises a forward osmosis membrane and a clamp thereof, the forward osmosis membrane can be made in a plate type or hollow fiber manufacturing mode, and a cavity of one side membrane chamber and a cavity of the other side membrane chamber are respectively provided with an outlet and an inlet.
The transparent square double-side four-outlet type membrane component provided by the invention has a membrane material which is a composite amide semi-permeable membrane assisted with a polyamide coating, and the membrane flux is 25L/m2h, setting the effective membrane area at 50x (50-100 mm) under the working condition that the volume of the raw material liquid is 2L. The teaching experiment runs for 1-2 hours, and the change of the osmotic pressure of the drawing liquid is ensured.
The peristaltic pump I1 is connected with a conductivity meter I3 and a photometer 5, the peristaltic pump II 2 is connected with a conductivity meter II 4 and a pressure gauge 6, an electronic balance 7 is arranged below a raw material liquid measuring cup 9 in an auxiliary mode, and a magnetic stirrer 8 can be arranged on a liquid drawing cup 10. The first conductivity meter 3, the photometer 5, the second conductivity meter 4, the pressure meter 6 and the electronic balance 7 are all connected with a computer 12. Wherein, the raw material liquid measuring cup 9, the peristaltic pump I1 and the cavity of the membrane chamber at one side of the membrane component 11 form a loop, and the liquid drawing cup 10, the peristaltic pump II 2 and the cavity of the membrane chamber at the other side of the membrane component 11 form a loop.
The membrane module 11 is positioned in the middle of the cross beam, and the peristaltic pump I1, the conductivity meter I3, the photometer 5, the peristaltic pump II 2, the conductivity meter II 4 and the pressure gauge 6 are symmetrically positioned on two sides of the membrane module 11, namely a non-water operation electricity utilization area; the raw material liquid measuring cup 9 and the liquid drawing cup 10 are respectively positioned below the cross beam, namely a water experiment operation area.
The conductivity meter is EC-510, and adopts a wide-range conductivity electrode (such as 0-200ms/cm), so as to meet the working requirements of raw material liquid and drawing liquid with different concentrations; the pressure gauge adopts a digital sensitive pressure gauge HLGK-Y100 and can indicate the low-pressure and low-consumption operation condition of the forward osmosis membrane; the digital display type pressure gauge and the conductivity meter can intuitively and accurately read the conductivity value data of the pressure value and the salt concentration of the corresponding two liquid solutions. All electrical appliances including the peristaltic pump providing power use 24VDC experimental safety power, and the power of the whole experimental equipment is about 100 watts. The circulating water volume value of each peristaltic pump is about 0-550 ml/min, and the digital pump rotating speed (flow) is convenient for visual operation in the experiment teaching process.
The volume of raw materials liquid graduated flask 9 and draw liquid measure cup 10 can generally be taken 2L, and the graduated flask all has the scale to indicate, and its space is handheld to take conveniently, and electronic balance 7's weighing range and measurement accuracy can satisfy the weighing requirement of raw materials liquid, and the volume of raw materials liquid, quality physical index are accomplished by raw materials liquid graduated flask 9 scale and electronic balance 7. The magnetic stirrer 8 has adjustable power and is used for self-circulation mixing of the absorption liquid, and the device has the characteristic of high dynamic visualization of digital-to-analog conversion, thereby ensuring the modernization requirement of laboratory teaching.
The experimental method using the device is characterized in that the salinity (osmotic pressure) of the draw solution is higher than that of the raw material solution, a working mode of self-circulation draw solution with fixed volume is adopted, 2L of draw solution is selected, and a membrane component for experiments, such as a flat forward osmosis membrane (flux: 25L/m) is ensured under the condition of ensuring the working osmotic pressure of the forward osmosis membrane2h; flow rate of the raw material liquid film surface: 5 cm/s; size: 50x 50-100 mm; is suitable for the pH range of 2-11), can realize the obvious experimental effect even for 1-2 hours, and meets the experimental teaching requirements of common times.
After the pipeline is connected with systems such as a membrane assembly and the like, respectively starting up to extract raw material liquid and drawing liquid, simultaneously starting up the magnetic stirrer 8 to mix the drawing liquid, and respectively returning to the measuring cup for self-circulation operation, wherein the process specifically comprises the following steps:
the peristaltic pump I1 sucks raw material liquid from the raw material liquid measuring cup 9 and sends the raw material liquid into a cavity of a membrane chamber on one side of the membrane assembly 11, water molecules of the raw material liquid permeate from the cavity of the membrane chamber on one side to the cavity of the membrane chamber on the other side through the forward osmosis membrane and flow to the raw material liquid measuring cup 9, and circulation flow is continued.
The peristaltic pump II 2 sucks the drawing liquid from the liquid drawing liquid measuring cup 10 and sends the drawing liquid into the cavity of the membrane chamber on the other side of the membrane component 11, and the drawing liquid continuously flows back to the liquid drawing measuring cup 10 after drawing the permeating water molecules;
and (3) lasting for 1-2 hours, collecting the conductance, the water pressure and the flow of the two sides of the forward osmosis membrane and the measurement data of the electronic balance 7 at regular time in the process, and transmitting the data to the computer 12 for display.
The working condition parameters are as follows: flow system pressure 2x 10-3Mpa
5% NaCl (60-70ms/cm) is selected as the drawing liquid;
membrane modules (50x100mm membrane area);
membrane flux: 25L/M2H；
Controlling the flow of the raw material liquid: 27L/H;
controlling the flow of the drawing liquid: 13L/H;
and directly reading and collecting the weighing value by an electronic balance.
And recording experimental data of the raw material liquid and the drawing liquid end when the forward osmosis membrane system works and runs, and drawing a chart.
1) Adding feed liquid with salinity or color into the raw material liquid cup.
2) And checking that the equipment such as the pipeline connection, the circuit and the like of the system is normal.
3) 2L draw solution (5% NaCl) was used.
4) 1-2 time experiments.
5) Data recording quality, photometric values and conductometric values are shown in fig. 2, 3 and table 1.
For a typical printing and dyeing water sample with high salinity (time 0): the above parameters of the raw water and the draw solution were recorded at 10-minute intervals using NaCl draw solution having a conductivity value (70.2ms/cm) and the weight (1320g), conductivity value (1027. mu.s/cm), absorbance (0.372A), and are recorded in Table 1. By measuring the water flux of a forward osmosis membrane. And knowing the concentration and emission reduction effects of the raw water.
From the data in table 1, a plot 2 of the time interval trend of the decrease in mass of the stock solution and the increase in absorbance of the dye color is plotted.
From the data of table 1, a plot 3 is plotted of the time interval trend for increased feedstock conductivity and decreased draw conductivity.
Table 1: mass/photometric/conductivity-time change table
6) The experimental effect is illustrated by the concentration and reduction of the raw material liquid and the operation power consumption of the experiment.
7) Thinking question 1: the salinity (concentration) and absorbance value A of the raw material liquid can be changed. And calculating the actual membrane water flux L/h of the device.
8) Question of thinking 2: when seawater is selected as the draw solution, the seawater is diluted by water molecules during this cycle. Why: the concentrated brine produced by treating the diluted seawater with the reverse osmosis module can supplement the draw solution.
9) Question of thinking 3: how to understand the low carbon and energy saving of the forward osmosis membrane water treatment technology.
In addition, test solutions (waste liquid or sample) such as landfill leachate, pesticide production wastewater, plant extracts, heat-sensitive substance intermediates and the like can be selected, and open experiments are designed by the forward osmosis FO membrane treatment technology, so as to explain how to realize the operation of homogeneous concentration, sterilization and reduction treatment under the conditions of low pressure and low energy consumption.
In conclusion, the working principle of the forward osmosis membrane is learned and mastered by adopting a self-circulation water drawing mode and by acquiring real-time data of multiple factors such as salinity, luminosity, water pressure, water temperature, flow and the like on two sides of the FO membrane through osmotic volume and mass change. The device equipment structure designed by human engineering accords with the requirements of open parameters, intuitive operation, obvious test effect, safety, low consumption and efficient utilization of space in teaching experiments.
Claims (4)
1. The utility model provides a teaching experimental apparatus for forward osmosis membrane water treatment, includes former feed liquid graduated flask (9), draws liquid measure cup (10), peristaltic pump (1), peristaltic pump two (2) and membrane module (11), membrane module (11) comprises forward osmosis membrane and anchor clamps thereof, and its characterized in that, former feed liquid graduated flask (9), peristaltic pump (1) and one side diaphragm chamber cavity formation return circuit of membrane module (11), draw liquid graduated flask (10), peristaltic pump two (2) and the opposite side diaphragm chamber cavity formation return circuit of membrane module (11), peristaltic pump one (1) is connected with conductometer one (3) and photometer (5), peristaltic pump two (2) are connected with conductometer two (4) and pressure gauge (6), supplementary being equipped with electronic balance (7) under former feed liquid graduated flask (9), conductometer one (3), photometer (5), conductometer two (4), The pressure gauge (6) and the electronic balance (7) are both connected with a computer (12).
2. The water treatment teaching experiment device with forward osmosis membrane according to claim 1, wherein the draw solution measuring cup (10) is equipped with a magnetic stirrer (8).
3. The water treatment teaching experiment device with the forward osmosis membrane as claimed in claim 1, wherein the forward osmosis membrane is processed into a flat plate type or a hollow fiber type, the membrane module (11) is detachable, and the cavity of the membrane chamber on one side and the cavity of the membrane chamber on the other side are respectively provided with an outlet and an inlet.
4. The forward osmosis membrane water treatment teaching experiment device according to claim 1, wherein the device is of a door-shaped frame structure, the membrane module (11) is located in the middle of the beam, the peristaltic pump I (1) and the peristaltic pump II (2) are symmetrically located on two sides of the membrane module (11), and the raw material liquid measuring cup (9) and the liquid drawing cup (10) are located below the beam respectively.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120630733.9U CN214312321U (en) | 2021-03-29 | 2021-03-29 | Forward osmosis membrane water treatment teaching experiment device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202120630733.9U CN214312321U (en) | 2021-03-29 | 2021-03-29 | Forward osmosis membrane water treatment teaching experiment device |
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| CN214312321U true CN214312321U (en) | 2021-09-28 |
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