CN112408549A - Device and method for removing tannic acid in micro-polluted water body - Google Patents
Device and method for removing tannic acid in micro-polluted water body Download PDFInfo
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- CN112408549A CN112408549A CN202011197100.XA CN202011197100A CN112408549A CN 112408549 A CN112408549 A CN 112408549A CN 202011197100 A CN202011197100 A CN 202011197100A CN 112408549 A CN112408549 A CN 112408549A
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- tannic acid
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- TUSDEZXZIZRFGC-UHFFFAOYSA-N 1-O-galloyl-3,6-(R)-HHDP-beta-D-glucose Natural products OC1C(O2)COC(=O)C3=CC(O)=C(O)C(O)=C3C3=C(O)C(O)=C(O)C=C3C(=O)OC1C(O)C2OC(=O)C1=CC(O)=C(O)C(O)=C1 TUSDEZXZIZRFGC-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 239000001263 FEMA 3042 Substances 0.000 title claims abstract description 37
- LRBQNJMCXXYXIU-PPKXGCFTSA-N Penta-digallate-beta-D-glucose Natural products OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-PPKXGCFTSA-N 0.000 title claims abstract description 37
- LRBQNJMCXXYXIU-NRMVVENXSA-N tannic acid Chemical compound OC1=C(O)C(O)=CC(C(=O)OC=2C(=C(O)C=C(C=2)C(=O)OC[C@@H]2[C@H]([C@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)[C@@H](OC(=O)C=3C=C(OC(=O)C=4C=C(O)C(O)=C(O)C=4)C(O)=C(O)C=3)O2)OC(=O)C=2C=C(OC(=O)C=3C=C(O)C(O)=C(O)C=3)C(O)=C(O)C=2)O)=C1 LRBQNJMCXXYXIU-NRMVVENXSA-N 0.000 title claims abstract description 37
- 229940033123 tannic acid Drugs 0.000 title claims abstract description 37
- 235000015523 tannic acid Nutrition 0.000 title claims abstract description 37
- 229920002258 tannic acid Polymers 0.000 title claims abstract description 37
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 28
- 238000000034 method Methods 0.000 title claims abstract description 18
- 239000012528 membrane Substances 0.000 claims abstract description 82
- 239000007788 liquid Substances 0.000 claims abstract description 73
- 239000002994 raw material Substances 0.000 claims abstract description 67
- 238000009292 forward osmosis Methods 0.000 claims abstract description 45
- 230000002572 peristaltic effect Effects 0.000 claims abstract description 16
- 239000000243 solution Substances 0.000 claims description 32
- 230000004907 flux Effects 0.000 claims description 20
- 229920001864 tannin Polymers 0.000 claims description 6
- 235000018553 tannin Nutrition 0.000 claims description 6
- 239000001648 tannin Substances 0.000 claims description 6
- 238000001514 detection method Methods 0.000 claims description 3
- 238000005070 sampling Methods 0.000 claims description 3
- 239000012527 feed solution Substances 0.000 claims description 2
- 230000014759 maintenance of location Effects 0.000 abstract description 12
- 238000010521 absorption reaction Methods 0.000 abstract description 8
- 230000008569 process Effects 0.000 abstract description 4
- 238000005265 energy consumption Methods 0.000 abstract description 2
- 239000003344 environmental pollutant Substances 0.000 description 4
- 231100000719 pollutant Toxicity 0.000 description 4
- 230000008859 change Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 229930013930 alkaloid Natural products 0.000 description 1
- 150000003797 alkaloid derivatives Chemical class 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 229910001385 heavy metal Inorganic materials 0.000 description 1
- 150000002500 ions Chemical class 0.000 description 1
- 230000003204 osmotic effect Effects 0.000 description 1
- 150000008442 polyphenolic compounds Chemical class 0.000 description 1
- 235000013824 polyphenols Nutrition 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000001223 reverse osmosis Methods 0.000 description 1
- 230000001988 toxicity Effects 0.000 description 1
- 231100000419 toxicity Toxicity 0.000 description 1
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Classifications
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- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F1/00—Treatment of water, waste water, or sewage
- C02F1/44—Treatment of water, waste water, or sewage by dialysis, osmosis or reverse osmosis
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
-
- C—CHEMISTRY; METALLURGY
- C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
- C02F2101/00—Nature of the contaminant
- C02F2101/30—Organic compounds
- C02F2101/34—Organic compounds containing oxygen
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- Physics & Mathematics (AREA)
- Chemical & Material Sciences (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Life Sciences & Earth Sciences (AREA)
- General Physics & Mathematics (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- Health & Medical Sciences (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Hydrology & Water Resources (AREA)
- Engineering & Computer Science (AREA)
- Environmental & Geological Engineering (AREA)
- Water Supply & Treatment (AREA)
- Organic Chemistry (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention discloses a device and a method for removing tannic acid in micro-polluted water, wherein the device comprises a raw material liquid barrel, a forward osmosis membrane component and a liquid-drawing beaker, wherein the raw material liquid barrel is connected with the forward osmosis membrane component through a first peristaltic pump, and raw material liquid flows into the forward osmosis membrane component from the raw material liquid barrel and flows back to the raw material liquid barrel; the absorption liquid beaker is connected with the forward osmosis membrane component through a second peristaltic pump, and absorption liquid flows into the forward osmosis membrane component from the absorption liquid beaker and flows back to the absorption liquid beaker; the active layer of the forward osmosis membrane component faces to the raw material liquid, and tannic acid in the raw material liquid is trapped on the raw material liquid side of the forward osmosis membrane component. The method utilizes forward osmosis as a core process to remove the tannic acid, has the advantages of low energy consumption, simple equipment and light membrane pollution, can effectively purify the tannic acid in the water body, and has higher retention rate on the tannic acid.
Description
Technical Field
The invention relates to a device and a method for removing tannic acid in micro-polluted water, belonging to the technical field of water treatment.
Background
Tannin is widely present in a slightly polluted water body, as a common soluble and difficultly-degraded polyphenol pollutant, the common process can not remove a large amount of the tannin, the tannin not only can generate certain influence on the color of the water body, but also has certain toxicity, and in addition, the tannin can react with alkaloid and heavy metal ions in the water body to form insoluble composite pollutants, which threatens the safety of municipal water supply. The conventional reverse osmosis process needs a large amount of external force, the equipment is complex, and a large amount of tannic acid in the slightly polluted water body cannot be removed.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provide a device and a method for removing tannic acid in a slightly polluted water body.
In order to solve the technical problems, the invention provides a device for removing tannic acid in micro-polluted water, which comprises a raw material liquid barrel, a forward osmosis membrane component and a draw solution beaker, wherein the raw material liquid barrel is connected with the forward osmosis membrane component through a first peristaltic pump, and raw material liquid flows into the forward osmosis membrane component from the raw material liquid barrel and flows back to the raw material liquid barrel; the absorption liquid beaker is connected with the forward osmosis membrane component through a second peristaltic pump, and absorption liquid flows into the forward osmosis membrane component from the absorption liquid beaker and flows back to the absorption liquid beaker; the active layer of the forward osmosis membrane component faces to the raw material liquid, and tannic acid in the raw material liquid is trapped on the raw material liquid side of the forward osmosis membrane component.
Preferably, the two sides of the membrane of the forward osmosis membrane module adopt a cross flow mode, and the flow rate of the membrane surface is changed by the flow rate of the first peristaltic pump and the second peristaltic pump.
Preferably, a temperature controller for adjusting the temperature of the raw material liquid is arranged between the raw material liquid barrel and the forward osmosis membrane assembly, and the temperature controller is connected with a computer.
Preferably, the raw material liquid in the raw material liquid barrel is connected with a conductivity meter, and the conductivity meter is connected with a computer.
Preferably, the draw solution beaker is placed on an electronic balance, and the electronic balance is connected with a computer.
The invention also provides a method for removing tannic acid in the slightly polluted water body by using the device, which comprises the following steps: and adding the raw material liquid to be detected into the raw material liquid barrel, sampling the two sides of the forward osmosis membrane assembly every 1 hour after the test operation is stable, performing ultraviolet spectroscopic detection, detecting the content of tannic acid under the condition that the wavelength is 276nm, calculating to obtain the retention rate, and substituting the quality of the draw liquid into a formula to calculate to obtain the membrane flux.
Preferably, the calculation formula of the membrane flux is as follows:
wherein, JsIs the actual membrane flux, in L.m-2·h-1；mtAnd m0The final and initial masses of the draw solution, respectively, in g; t is time in units of h; a is the effective membrane area in m2Rho is water density and is 1 kg.L-1。
Preferably, the calculation formula of the retention rate is as follows:
wherein, Cg(t)And Cg(0)Respectively representing the concentration of the tannic acid in the raw material liquid at the time t and the initial time, wherein the unit is mg/L; vg(t)And Vg(0)The volumes of the raw material liquids at time t and the initial time, respectively, are expressed in units of L.
Preferably, the temperature of the raw material liquid is 20-30 ℃, the concentration is 10-40mg/L, and the pH value is 3-7.
Preferably, the concentration of the draw solution is 0.5-2M, and the membrane surface flow rate is 8-17 cm/s.
The invention achieves the following beneficial effects: the invention uses the osmotic pressure difference between the raw material liquid and the drawing liquid as the driving force to make the water molecules in the raw material liquid penetrate through the membrane and the pollutants are intercepted, thereby achieving the purpose of removing the pollutants. The method utilizes forward osmosis as a core process to remove the tannic acid, has the advantages of low energy consumption, simple equipment and light membrane pollution, can effectively purify the tannic acid in the water body, and has higher retention rate on the tannic acid.
Drawings
FIG. 1 is a schematic structural diagram of an apparatus for removing tannic acid from a slightly polluted water body according to the present invention.
Wherein: 1. a raw material liquid barrel; 2. a peristaltic pump; 3. a forward osmosis membrane module; 4. a temperature controller; 5. drawing a liquid beaker; 6. an electronic balance; 7. a peristaltic pump; 8. a computer; 9. a conductivity meter.
FIG. 2 is a graph showing the flux of the membranes and the retention of tannic acid by the forward osmosis membrane under the temperature-affected conditions of the raw material solutions of example 1.
FIG. 3 is a graph showing the membrane flux and tannin rejection rate of forward osmosis membrane under the influence of different concentrations of draw solution in example 2.
FIG. 4 is a graph showing the flux of the membrane and the rejection of tannic acid by the forward osmosis membrane under the influence of different concentrations of the raw material solution in example 3.
FIG. 5 is a graph showing the flux of the membrane and the rejection of tannic acid by the forward osmosis membrane under the influence of different membrane surface flow rates in example 4.
FIG. 6 is a graph showing the flux of the membranes and the retention of tannic acid by the forward osmosis membrane under the influence of pH of the different feed solutions of example 5.
Detailed Description
The invention is further described below with reference to the accompanying drawings. The following examples are only for illustrating the technical solutions of the present invention more clearly, and the protection scope of the present invention is not limited thereby.
As shown in fig. 1, the present invention provides an apparatus for removing tannic acid from a micro-polluted water body, comprising a raw material liquid barrel 1, a forward osmosis membrane module 3 and a draw solution beaker 5, wherein the raw material liquid barrel 1 is connected with the forward osmosis membrane module 3 through a first peristaltic pump 2, and the raw material liquid flows into the forward osmosis membrane module 3 from the raw material liquid barrel 1 and flows back to the raw material liquid barrel 1; the draw solution beaker 5 is connected with the forward osmosis membrane component 3 through a second peristaltic pump 7, and draw solution flows into the forward osmosis membrane component from the draw solution beaker 5 and flows back to the draw solution beaker 5; the active layer of the forward osmosis membrane module 3 faces the raw material solution side, and tannic acid in the raw material solution is trapped on the raw material solution side of the forward osmosis membrane module 3. The two sides of the forward osmosis membrane module 3 adopt a cross flow mode, and the flow rate of the membrane surface is changed by the flow rate of the first peristaltic pump 2 and the second peristaltic pump 7. A temperature controller 4 for adjusting the temperature of the raw material liquid is arranged between the raw material liquid barrel 1 and the forward osmosis membrane component 3, and the temperature controller 4 is connected with a computer 8. The raw material liquid in the raw material liquid barrel 1 is connected with a conductivity meter 9, and the conductivity meter 9 is connected with a computer 8. The draw solution beaker 5 is placed on an electronic balance 6, and the electronic balance 6 is connected with a computer 8.
The invention also provides a method for removing tannic acid in the slightly polluted water body by using the device, which comprises the following steps: adding the raw material liquid to be detected into the raw material liquid barrel 1, sampling at two sides of the forward osmosis membrane assembly 3 every 1 hour after the test operation is stable, performing ultraviolet light splitting detection, detecting the content of tannic acid under the condition that the wavelength is 276nm, calculating to obtain the rejection rate, and substituting the quality of the drawn liquid into a formula to calculate to obtain the membrane flux. The calculation formula of the membrane flux is as follows:
wherein, JsIs the actual membrane flux, in L.m-2·h-1；mtAnd m0The final and initial masses of the draw solution, respectively, in g; t is time in units of h; a is the effective membrane area in m2Rho is water density and is 1 kg.L-1。
The calculation formula of the retention rate is as follows:
wherein, Cg(t)And Cg(0)Respectively representing the concentration of the tannic acid in the raw material liquid at the time t and the initial time, wherein the unit is mg/L; vg(t)And Vg(0)The volumes of the raw material liquids at time t and the initial time, respectively, are expressed in units of L.
The temperature of the raw material liquid is 20-30 ℃, the concentration is 10-40mg/L, and the pH value is 3-7. The concentration of the drawing liquid is 0.5-2M. The flow rate of the membrane surface is 8-17 cm/s.
Example 1
When the temperature of the raw material liquid is 20, 25 and 30 ℃, the membrane flux is increased along with the increase of the temperature, the retention rate is about 99.7 percent, and the change is not obvious.
Example 2
When the concentration of the draw solution is 0.5, 1 and 2mol/L, the membrane flux is obviously increased along with the increase of the concentration of the draw solution, and the rejection rate is slightly reduced and maintained at about 99.7 percent.
Example 3
When the concentration of the raw material liquid is 10, 25 and 40mg/L, the membrane flux is reduced along with the increase of the concentration of the raw material liquid, the retention rate is slightly improved and is maintained at about 99.7-99.8%.
Example 4
When the flow velocity of the membrane surface is 8.3 cm/s, 12.5 cm/s and 16.7cm/s, the flux of the membrane is increased along with the increase of the flow velocity of the membrane surface, and the rejection rate is reduced and is more than 99.75 percent.
Example 5
At pH values of 3.1, 5.6 and 7.0, the membrane flux is highest at pH value of 5.6, the retention rate is above 99.7% and the change is not obvious.
The above examples all show that the membrane flux can be increased along with the increase of temperature, the increase of concentration of the draw solution, the reduction of concentration of the raw material solution and the increase of flow velocity of the membrane surface, the retention rate of the forward osmosis membrane to the tannic acid is above 99.7%, and the retention effect is good.
The above description is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present invention, and these modifications and variations should also be regarded as the protection scope of the present invention.
Claims (10)
1. The device for removing tannic acid in micro-polluted water is characterized by comprising a raw material liquid barrel (1), a forward osmosis membrane component (3) and a draw liquid beaker (5), wherein the raw material liquid barrel (1) is connected with the forward osmosis membrane component (3) through a first peristaltic pump (2), and raw material liquid flows into the forward osmosis membrane component (3) from the raw material liquid barrel (1) and flows back to the raw material liquid barrel (1); the draw solution beaker (5) is connected with the forward osmosis membrane component (3) through a second peristaltic pump (7), and draw solution flows into the forward osmosis membrane component from the draw solution beaker (5) and flows back to the draw solution beaker (5); the active layer of the forward osmosis membrane component (3) faces the raw material solution, and tannic acid in the raw material solution is trapped on the raw material solution side of the forward osmosis membrane component (3).
2. The apparatus for removing tannic acid from a micro-polluted water body according to claim 1, wherein the forward osmosis membrane module (3) adopts a cross flow mode on both sides of the membrane, and the flow rate of the membrane surface is changed by the flow rate of the first peristaltic pump (2) and the second peristaltic pump (7).
3. The apparatus for removing tannic acid from a micro-polluted water body according to claim 1, wherein a temperature controller (4) for adjusting the temperature of the raw material liquid is arranged between the raw material liquid barrel (1) and the forward osmosis membrane module (3), and the temperature controller (4) is connected with the computer (8).
4. The apparatus for removing tannic acid from a body of slightly polluted water according to claim 1, wherein the raw material liquid in the raw material liquid barrel (1) is connected with a conductivity meter (9), and the conductivity meter (9) is connected with a computer (8).
5. The apparatus for the removal of tannins from bodies of micro-polluted water according to claim 1, characterized in that said draw solution beaker (5) is placed on an electronic balance (6), said electronic balance (6) being connected to a computer (8).
6. A method for removing tannic acid from a body of micro-polluted water by using the apparatus of any one of claims 1 to 5, comprising: adding the raw material liquid to be detected into the raw material liquid barrel (1), sampling two sides of the positive osmosis membrane component (3) every 1 hour after the test operation is stable, carrying out ultraviolet light splitting detection, detecting the content of tannic acid under the condition that the wavelength is 276nm, calculating the rejection rate, and substituting the quality of the drawing liquid into a formula to calculate the membrane flux.
7. The method of claim 6, wherein the membrane flux is calculated by the formula:
wherein, JsIs the actual membrane flux, in L.m-2·h-1；mtAnd m0The final and initial masses of the draw solution, respectively, in g; t is time in units of h; a is the effective membrane area in m2(ii) a Rho is water density and is 1 kg.L-1。
8. The method of claim 6, wherein the rejection rate is calculated by the formula:
wherein, Cg(t)And Cg(0)Respectively representing the concentration of the tannic acid in the raw material liquid at the time t and the initial time, wherein the unit is mg/L; vg(t)And Vg(0)The volumes of the raw material liquids at time t and the initial time, respectively, are expressed in units of L.
9. The method of claim 6, wherein the feed solution has a temperature of 20-30 ℃, a concentration of 10-40mg/L, and a pH of 3-7.
10. The method of claim 6, wherein the draw solution concentration is 0.5-2M and the membrane surface flow rate is 8-17 cm/s.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011197100.XA CN112408549A (en) | 2020-10-30 | 2020-10-30 | Device and method for removing tannic acid in micro-polluted water body |
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| CN202011197100.XA CN112408549A (en) | 2020-10-30 | 2020-10-30 | Device and method for removing tannic acid in micro-polluted water body |
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| CN112408549A true CN112408549A (en) | 2021-02-26 |
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| CN202011197100.XA Pending CN112408549A (en) | 2020-10-30 | 2020-10-30 | Device and method for removing tannic acid in micro-polluted water body |
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Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205495362U (en) * | 2016-03-30 | 2016-08-24 | 西安皓海嘉水处理科技有限责任公司 | Positive osmotic membrane performance detection device |
| CN106925119A (en) * | 2017-03-10 | 2017-07-07 | 山东大学 | Poly-epoxy succinic acid is used as drawing application of the liquid in positive infiltration |
-
2020
- 2020-10-30 CN CN202011197100.XA patent/CN112408549A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN205495362U (en) * | 2016-03-30 | 2016-08-24 | 西安皓海嘉水处理科技有限责任公司 | Positive osmotic membrane performance detection device |
| CN106925119A (en) * | 2017-03-10 | 2017-07-07 | 山东大学 | Poly-epoxy succinic acid is used as drawing application of the liquid in positive infiltration |
Non-Patent Citations (3)
| Title |
|---|
| 夏圣骥 等: ""正渗透膜有机污染的实验研究"" * |
| 夏圣骥 等: "正渗透膜有机污染的实验研究", 《水处理技术》 * |
| 董秉直 等: "《饮用水膜法处理新技术》", 30 September 2015, 同济大学出版社 * |
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Application publication date: 20210226 |