CN114870642A - Preparation method of modified ceramic membrane for filter backwashing wastewater treatment - Google Patents
Preparation method of modified ceramic membrane for filter backwashing wastewater treatment Download PDFInfo
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- CN114870642A CN114870642A CN202210563691.0A CN202210563691A CN114870642A CN 114870642 A CN114870642 A CN 114870642A CN 202210563691 A CN202210563691 A CN 202210563691A CN 114870642 A CN114870642 A CN 114870642A
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- ceramic membrane
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- 239000012528 membrane Substances 0.000 title claims abstract description 83
- 239000000919 ceramic Substances 0.000 title claims abstract description 73
- 238000011001 backwashing Methods 0.000 title claims abstract description 29
- 238000004065 wastewater treatment Methods 0.000 title claims abstract description 23
- 238000002360 preparation method Methods 0.000 title claims abstract description 14
- SQGYOTSLMSWVJD-UHFFFAOYSA-N silver(1+) nitrate Chemical compound [Ag+].[O-]N(=O)=O SQGYOTSLMSWVJD-UHFFFAOYSA-N 0.000 claims abstract description 36
- 239000011248 coating agent Substances 0.000 claims abstract description 30
- 238000000576 coating method Methods 0.000 claims abstract description 30
- 239000011664 nicotinic acid Substances 0.000 claims abstract description 23
- 229910001961 silver nitrate Inorganic materials 0.000 claims abstract description 18
- 239000007788 liquid Substances 0.000 claims abstract description 16
- 238000004381 surface treatment Methods 0.000 claims abstract description 15
- 238000000034 method Methods 0.000 claims abstract description 14
- 239000003607 modifier Substances 0.000 claims abstract description 8
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims description 30
- 238000004140 cleaning Methods 0.000 claims description 12
- 239000000126 substance Substances 0.000 claims description 11
- 239000006087 Silane Coupling Agent Substances 0.000 claims description 8
- 238000005273 aeration Methods 0.000 claims description 8
- VYFYYTLLBUKUHU-UHFFFAOYSA-N dopamine Chemical compound NCCC1=CC=C(O)C(O)=C1 VYFYYTLLBUKUHU-UHFFFAOYSA-N 0.000 claims description 8
- LNTHITQWFMADLM-UHFFFAOYSA-N gallic acid Chemical compound OC(=O)C1=CC(O)=C(O)C(O)=C1 LNTHITQWFMADLM-UHFFFAOYSA-N 0.000 claims description 8
- 150000001412 amines Chemical class 0.000 claims description 7
- 150000008442 polyphenolic compounds Chemical class 0.000 claims description 7
- 235000013824 polyphenols Nutrition 0.000 claims description 7
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims description 5
- 239000007888 film coating Substances 0.000 claims description 5
- 238000009501 film coating Methods 0.000 claims description 5
- 239000000203 mixture Substances 0.000 claims description 5
- 229910052760 oxygen Inorganic materials 0.000 claims description 5
- 239000001301 oxygen Substances 0.000 claims description 5
- PIICEJLVQHRZGT-UHFFFAOYSA-N Ethylenediamine Chemical compound NCCN PIICEJLVQHRZGT-UHFFFAOYSA-N 0.000 claims description 4
- 229920002873 Polyethylenimine Polymers 0.000 claims description 4
- YCIMNLLNPGFGHC-UHFFFAOYSA-N catechol Chemical compound OC1=CC=CC=C1O YCIMNLLNPGFGHC-UHFFFAOYSA-N 0.000 claims description 4
- 229960003638 dopamine Drugs 0.000 claims description 4
- 229940074391 gallic acid Drugs 0.000 claims description 4
- 235000004515 gallic acid Nutrition 0.000 claims description 4
- NAQMVNRVTILPCV-UHFFFAOYSA-N hexane-1,6-diamine Chemical compound NCCCCCCN NAQMVNRVTILPCV-UHFFFAOYSA-N 0.000 claims description 4
- WSFSSNUMVMOOMR-UHFFFAOYSA-N Formaldehyde Chemical compound O=C WSFSSNUMVMOOMR-UHFFFAOYSA-N 0.000 claims description 3
- SXRSQZLOMIGNAQ-UHFFFAOYSA-N Glutaraldehyde Chemical compound O=CCCCC=O SXRSQZLOMIGNAQ-UHFFFAOYSA-N 0.000 claims description 3
- 239000008098 formaldehyde solution Substances 0.000 claims description 3
- 238000007654 immersion Methods 0.000 claims 1
- 239000002351 wastewater Substances 0.000 abstract description 9
- 238000000926 separation method Methods 0.000 abstract description 5
- 239000002028 Biomass Substances 0.000 abstract description 3
- 239000003344 environmental pollutant Substances 0.000 abstract description 3
- 230000004907 flux Effects 0.000 abstract description 3
- 239000002245 particle Substances 0.000 abstract description 3
- 231100000719 pollutant Toxicity 0.000 abstract description 3
- 238000011084 recovery Methods 0.000 abstract description 3
- 241000894006 Bacteria Species 0.000 abstract description 2
- 241000195493 Cryptophyta Species 0.000 abstract description 2
- 230000005484 gravity Effects 0.000 abstract description 2
- 230000014759 maintenance of location Effects 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 6
- 239000002105 nanoparticle Substances 0.000 description 3
- 239000008399 tap water Substances 0.000 description 3
- 235000020679 tap water Nutrition 0.000 description 3
- 238000000108 ultra-filtration Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000002035 prolonged effect Effects 0.000 description 2
- 238000004064 recycling Methods 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 150000001299 aldehydes Chemical class 0.000 description 1
- 230000000844 anti-bacterial effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000003912 environmental pollution Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000000813 microbial effect Effects 0.000 description 1
- 229920000768 polyamine Polymers 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 238000000746 purification Methods 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910052709 silver Inorganic materials 0.000 description 1
- 239000004332 silver Substances 0.000 description 1
- -1 silver ions Chemical class 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D69/00—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor
- B01D69/02—Semi-permeable membranes for separation processes or apparatus characterised by their form, structure or properties; Manufacturing processes specially adapted therefor characterised by their properties
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D71/00—Semi-permeable membranes for separation processes or apparatus characterised by the material; Manufacturing processes specially adapted therefor
- B01D71/06—Organic material
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2323/00—Details relating to membrane preparation
- B01D2323/02—Hydrophilization
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
- Y02W10/00—Technologies for wastewater treatment
- Y02W10/10—Biological treatment of water, waste water, or sewage
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
A preparation method of a modified ceramic membrane for filter backwashing wastewater treatment relates to a preparation method of a separation membrane. The invention aims to solve the problems of high concentration of particle pollutants, high biomass content and serious membrane pollution in the backwashing wastewater of the existing filter tank, which causes the low service life of the membrane. The method comprises the following steps: firstly, preparing bionic coating liquid; conveying the bionic coating liquid to a ceramic membrane component in a ceramic membrane coating pool, and circularly flowing; thirdly, aerating; fourthly, silver nitrate treatment is used; and fifthly, carrying out surface treatment by using a modifier solution to obtain the modified ceramic membrane for filter backwashing wastewater treatment. The modified ceramic membrane for filter backwashing wastewater treatment prepared by the invention can realize gravity drive, and the permeation flux can reach 200Lm ‑2 h ‑1 The retention rate of turbidity, algae, bacteria and the like can reach more than 99.999 percent, and the recovery rate can reach more than 98 percent. The invention is suitable for processingAnd backwashing the wastewater in the filter.
Description
Technical Field
The invention relates to a preparation method of a separation membrane.
Background
Filter tank backwashing wastewater and the like in the water treatment process of a water plant are main sources of water plant wastewater, and account for 5% -10% of daily water yield of the water plant. Because the quantity of tap water plants and the water production scale in China are gradually increased, the water quantity of the tap water plants is huge, if the tap water plants can be recycled and utilized, raw water resources and water delivery engineering cost are saved, and environmental pollution caused by waste water discharge is reduced, so that sustainable development and effective utilization of water resources are realized. China is a large water-consuming country, the water supply amount of China is about 6000 hundred million tons every year, the equipment is popularized to save water, and the water saving amount can reach 180 hundred million tons to 600 hundred million tons per year at most. At present, the backwashing water recycling technology is still in a starting stage, a large-scale application example is provided, the technology is a commercial blue sea, and the growth space is huge.
The membrane technology is taken as a core technology of a third-generation water purification process, gradually enters the market, and can effectively realize the recycling of backwash water. However, the backwash water has high concentration of particle pollutants, high biomass content, serious membrane pollution and short service life.
Disclosure of Invention
The invention aims to solve the problems of high concentration of particle pollutants, high biomass content and serious membrane pollution in the existing filter backwashing wastewater, so that the service life of the membrane is short, and provides a preparation method of a modified ceramic membrane for filter backwashing wastewater treatment.
A preparation method of a modified ceramic membrane for filter backwashing wastewater treatment is completed according to the following steps:
firstly, preparing bionic coating liquid:
dispersing a solute into water by taking a polyphenol substance, an amine substance and a silane coupling agent as solutes to obtain a bionic coating solution;
conveying the bionic coating liquid to a ceramic membrane component in a ceramic membrane coating pool by a pump, and circularly flowing;
thirdly, aerating in the ceramic film coating pool to increase the oxygen content;
taking out the ceramic membrane module, cleaning the ceramic membrane module by using water, and placing the cleaned ceramic membrane module in a silver nitrate solution for surface treatment to obtain a silver nitrate-treated ceramic membrane module;
and fifthly, placing the ceramic membrane assembly treated by the silver nitrate into a modifier solution for surface treatment, taking out and cleaning to obtain the modified ceramic membrane for filter backwashing wastewater treatment.
The principle of the invention is as follows:
according to the invention, a bionic coating principle is utilized, a polyphenol-polyamine hydrophilic coating is combined on the surface of the ceramic, hydrophilic nanoparticles are introduced into the surface by further utilizing a silane coupling agent and the like, the surface hydrophilicity of the separation membrane is increased, silver ions are introduced into the surface, and Ag nanoparticles are generated through aldehyde reduction, so that the antibacterial effect is achieved; the method utilizes a surface bionic coating technology combined with a chemical grafting and nano particle preparation technology to construct a hydrophilic-antibacterial multi-stage pollution-resistant structure, so that the pollution-resistant characteristic of the ceramic membrane is improved, and the service life of the separation membrane is prolonged.
The invention has the advantages that:
the invention aims to develop a modified ceramic membrane for backwashing water treatment, which has obvious hydrophilicity and biological pollution resistance, can effectively kill microbial cells in backwashing water, and prevent membrane pollution; the modified ceramic membrane (separation membrane) for treating the backwashing wastewater of the filter tank, which is prepared by the invention, can realize gravity drive, and the permeation flux can reach 200Lm -2 h -1 The method has the advantages that the retention rate of turbidity, algae, bacteria and the like can reach more than 99.999 percent, the recovery rate can reach more than 98 percent, the pollution recovery rate can reach more than 98 percent, the cleaning period can reach more than one week, the operation cost is low, and the backwashing water can be efficiently recovered.
The invention is suitable for treating the backwashing wastewater of the filter tank.
Detailed Description
The following examples further illustrate the present invention but are not to be construed as limiting the invention. Modifications and substitutions to methods, steps or conditions of the present invention may be made without departing from the spirit of the invention.
The first embodiment is as follows: the embodiment provides a preparation method of a modified ceramic membrane for filter backwashing wastewater treatment, which is specifically completed by the following steps:
firstly, preparing bionic coating liquid:
dispersing a solute into water by taking a polyphenol substance, an amine substance and a silane coupling agent as solutes to obtain a bionic coating solution;
conveying the bionic coating liquid to a ceramic membrane component in a ceramic membrane coating pool by a pump, and circularly flowing;
thirdly, aerating in the ceramic film coating tank to increase the oxygen content;
taking out the ceramic membrane module, cleaning the ceramic membrane module by using water, and placing the cleaned ceramic membrane module in a silver nitrate solution for surface treatment to obtain a silver nitrate-treated ceramic membrane module;
and fifthly, placing the ceramic membrane assembly treated by the silver nitrate into a modifier solution for surface treatment, taking out and cleaning to obtain the modified ceramic membrane for filter backwashing wastewater treatment.
The second embodiment is as follows: the present embodiment differs from the present embodiment in that: the polyphenol substances in the step one are one or a mixture of dopamine, gallic acid and pyrocatechol. Other steps are the same as in the first embodiment.
The third concrete implementation mode: the present embodiment differs from the first or second embodiment in that: the amine substance in the step one is one or a mixture of ethylene diamine, hexamethylene diamine and polyethyleneimine. The other steps are the same as in the first or second embodiment.
The fourth concrete implementation mode is as follows: the difference between this embodiment and one of the first to third embodiments is as follows: the silane coupling agent in the first step is one or a mixture of KH550 and KH 560. The other steps are the same as those in the first to third embodiments.
The fifth concrete implementation mode: the difference between this embodiment and one of the first to fourth embodiments is: the mass ratio of the polyphenol substances, the amine substances and the silane coupling agents in the step one is (3-6): 1-4; the mass fraction of solute in the bionic coating liquid A is 1-10%. The other steps are the same as those in the first to fourth embodiments.
The sixth specific implementation mode is as follows: the difference between this embodiment and one of the first to fifth embodiments is as follows: and the ceramic membrane component in the second step is an immersed component or a column type membrane component. The other steps are the same as those in the first to fifth embodiments.
The seventh embodiment: the difference between this embodiment and the first to sixth embodiments is: the aeration rate in the third step is 0.011-10L/min, and the aeration time is 0.5-48 h. The other steps are the same as those in the first to sixth embodiments.
The specific implementation mode is eight: the difference between this embodiment and one of the first to seventh embodiments is: the time of the circulating flow in the step two is 0.5-48 h. The other steps are the same as those in the first to seventh embodiments.
The specific implementation method nine: the difference between this embodiment and the first to eighth embodiments is: the concentration of the silver nitrate solution in the fourth step is 0.01 g/L-10 g/L; the surface treatment time in the fourth step is 5min to 60 min. The other steps are the same as those in the first to eighth embodiments.
The detailed implementation mode is ten: the difference between this embodiment and one of the first to ninth embodiments is as follows: the modifier solution in the fifth step is formaldehyde solution or glutaraldehyde solution; the concentration of the modifier solution in the step five is 0.01 g/L-10 g/L; and the surface treatment time in the fifth step is 5-60 min. The other steps are the same as those in the first to ninth embodiments.
The present invention will be described in detail with reference to examples.
The following examples were used to demonstrate the beneficial effects of the present invention:
example 1: a preparation method of a modified ceramic membrane for filter backwashing wastewater treatment is specifically completed according to the following steps:
firstly, preparing bionic coating liquid:
dispersing the solute into water by using gallic acid, polyethyleneimine and KH560 as solutes to obtain a bionic coating solution;
in the first step, the mass fraction of gallic acid in the solute is 40%, the mass fraction of polyethyleneimine is 40%, and the mass fraction of KH560 is 20%; the mass fraction of solute in the bionic coating liquid in the step one is 5%;
conveying the bionic coating liquid to a ceramic membrane component in a ceramic membrane coating pool by a pump, and circularly flowing;
the ceramic membrane component in the second step is an immersed component;
the time of the circulating flow in the step two is 10 h;
thirdly, aerating in the ceramic film coating tank to increase the oxygen content;
the aeration speed in the third step is 0.8L/min, and the aeration time is 10 h;
taking out the ceramic membrane module, cleaning the ceramic membrane module by using water, and placing the cleaned ceramic membrane module in silver nitrate solution with the concentration of 0.5g/L for surface treatment for 20min to obtain a silver nitrate-treated ceramic membrane module;
fifthly, placing the ceramic membrane module treated by the silver nitrate into a formaldehyde solution with the concentration of 0.5g/L for surface treatment for 20min, taking out and cleaning to obtain the modified ceramic membrane for the filter backwashing wastewater treatment.
Example 2: a preparation method of a modified ceramic membrane for filter backwashing wastewater treatment is specifically completed according to the following steps:
firstly, preparing bionic coating liquid:
using dopamine, ethylenediamine and KH560 as solutes, and dispersing the solutes into water to obtain a bionic coating solution;
in the first step, the mass fraction of dopamine in the solute is 30%, the mass fraction of ethylenediamine is 30%, and the mass fraction of KH560 is 40%; the mass fraction of solute in the bionic coating liquid in the step one is 5%;
conveying the bionic coating liquid to a ceramic membrane component in a ceramic membrane coating pool by a pump, and circularly flowing;
the ceramic membrane component in the second step is an immersed component;
the time of the circulating flow in the step two is 6 h;
thirdly, aerating in the ceramic film coating tank to increase the oxygen content;
the aeration speed in the third step is 1.2L/min, and the aeration time is 6 h;
taking out the ceramic membrane module, cleaning the ceramic membrane module by using water, and placing the cleaned ceramic membrane module in silver nitrate solution with the concentration of 0.5g/L for surface treatment for 15min to obtain a silver nitrate-treated ceramic membrane module;
and fifthly, placing the ceramic membrane module treated by the silver nitrate into a glutaraldehyde solution with the concentration of 0.5g/L for surface treatment for 15min, taking out and cleaning to obtain the modified ceramic membrane for filter backwashing wastewater treatment.
Comparative example 1: commercial ultrafiltration membranes were used.
The modified ceramic membrane for filter backwash wastewater treatment prepared in examples 1-2 and the commercial ultrafiltration membrane in comparative example 1 were used to treat filter backwash wastewater, and the treatment effect and performance are shown in table 1;
TABLE 1
As can be seen from Table 1, the modified ceramic membrane for filter backwashing wastewater treatment prepared by the method has greatly improved permeation flux, improved pollution resistance, greatly prolonged cleaning period, excellent performance, greatly reduced operation cost and wide application prospect compared with a commercial ultrafiltration membrane.
Finally, it should be noted that: the above examples are only intended to illustrate the technical solution of the present invention, but not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit of the corresponding technical solutions of the embodiments of the present invention.
Claims (10)
1. A preparation method of a modified ceramic membrane for filter backwashing wastewater treatment is characterized by comprising the following steps:
firstly, preparing bionic coating liquid:
dispersing a solute into water by taking a polyphenol substance, an amine substance and a silane coupling agent as solutes to obtain a bionic coating solution;
conveying the bionic coating liquid to a ceramic membrane component in a ceramic membrane coating pool by a pump, and circularly flowing;
thirdly, aerating in the ceramic film coating tank to increase the oxygen content;
taking out the ceramic membrane module, cleaning the ceramic membrane module by using water, and placing the cleaned ceramic membrane module in a silver nitrate solution for surface treatment to obtain a silver nitrate-treated ceramic membrane module;
and fifthly, placing the ceramic membrane assembly treated by the silver nitrate into a modifier solution for surface treatment, taking out and cleaning to obtain the modified ceramic membrane for filter backwashing wastewater treatment.
2. The method according to claim 1, wherein the polyphenols in step one are a mixture of one or more of dopamine, gallic acid and catechol.
3. The method according to claim 1, wherein the amine is a mixture of one or more of ethylenediamine, hexamethylenediamine and polyethyleneimine.
4. The method according to claim 1, wherein the silane coupling agent in step one is selected from the group consisting of KH550 and KH 560.
5. The method for preparing a modified ceramic membrane for filter backwash wastewater treatment according to claim 1, wherein in the first step, the mass fraction of the polyphenols in the solute is 30-60%, the mass fraction of the amines in the solute is 30-60%, and the mass fraction of the silane coupling agent in the solute is 10-40%; the mass fraction of solute in the bionic coating liquid in the step one is 1-10%.
6. The method according to claim 1, wherein the ceramic membrane module in step two is an immersion module or a column module.
7. The preparation method of the modified ceramic membrane for filter backwashing wastewater treatment according to claim 1, wherein the aeration rate in the third step is 0.011-10L/min, and the aeration time is 0.5-48 h.
8. The method for preparing a modified ceramic membrane for filter backwashing wastewater treatment according to claim 1, wherein the time of the circulating flow in the second step is 0.5-48 hours.
9. The preparation method of the modified ceramic membrane for filter backwash wastewater treatment according to claim 1, wherein the concentration of the silver nitrate solution in the fourth step is 0.01g/L to 10 g/L; the surface treatment time in the fourth step is 5min to 60 min.
10. The method for preparing a modified ceramic membrane for filter backwash wastewater treatment according to claim 1, wherein the modifier solution in the fifth step is formaldehyde solution or glutaraldehyde solution; the concentration of the modifier solution in the step five is 0.01 g/L-10 g/L; and the surface treatment time in the fifth step is 5-60 min.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210563691.0A CN114870642B (en) | 2022-05-23 | 2022-05-23 | Preparation method of modified ceramic membrane for filter tank backwash wastewater treatment |
| PCT/CN2022/095247 WO2023225943A1 (en) | 2022-05-23 | 2022-05-26 | Preparation method for modified ceramic membrane for treating filter tank backwashing wastewater |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210563691.0A CN114870642B (en) | 2022-05-23 | 2022-05-23 | Preparation method of modified ceramic membrane for filter tank backwash wastewater treatment |
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| Publication Number | Publication Date |
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| CN114870642A true CN114870642A (en) | 2022-08-09 |
| CN114870642B CN114870642B (en) | 2023-09-12 |
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| CN202210563691.0A Active CN114870642B (en) | 2022-05-23 | 2022-05-23 | Preparation method of modified ceramic membrane for filter tank backwash wastewater treatment |
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| CN (1) | CN114870642B (en) |
| WO (1) | WO2023225943A1 (en) |
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| Publication number | Publication date |
|---|---|
| CN114870642B (en) | 2023-09-12 |
| WO2023225943A1 (en) | 2023-11-30 |
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