CN112029592B - Alkaline cleaning agent for hollow fiber ultrafiltration membrane and preparation method and application thereof - Google Patents
Alkaline cleaning agent for hollow fiber ultrafiltration membrane and preparation method and application thereof Download PDFInfo
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- CN112029592B CN112029592B CN202010726533.3A CN202010726533A CN112029592B CN 112029592 B CN112029592 B CN 112029592B CN 202010726533 A CN202010726533 A CN 202010726533A CN 112029592 B CN112029592 B CN 112029592B
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- hollow fiber
- ultrafiltration membrane
- fiber ultrafiltration
- cleaning agent
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- 239000012528 membrane Substances 0.000 title claims abstract description 155
- 238000000108 ultra-filtration Methods 0.000 title claims abstract description 133
- 239000012510 hollow fiber Substances 0.000 title claims abstract description 128
- 239000012459 cleaning agent Substances 0.000 title claims abstract description 85
- 238000002360 preparation method Methods 0.000 title claims abstract description 11
- PEDCQBHIVMGVHV-UHFFFAOYSA-N Glycerine Chemical compound OCC(O)CO PEDCQBHIVMGVHV-UHFFFAOYSA-N 0.000 claims abstract description 66
- 238000004140 cleaning Methods 0.000 claims abstract description 66
- 229920000056 polyoxyethylene ether Polymers 0.000 claims abstract description 49
- 229940051841 polyoxyethylene ether Drugs 0.000 claims abstract description 49
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 46
- PMZURENOXWZQFD-UHFFFAOYSA-L Sodium Sulfate Chemical compound [Na+].[Na+].[O-]S([O-])(=O)=O PMZURENOXWZQFD-UHFFFAOYSA-L 0.000 claims abstract description 22
- 150000008442 polyphenolic compounds Chemical class 0.000 claims abstract description 22
- 235000013824 polyphenols Nutrition 0.000 claims abstract description 22
- 229910052938 sodium sulfate Inorganic materials 0.000 claims abstract description 22
- 235000011152 sodium sulphate Nutrition 0.000 claims abstract description 22
- 239000004721 Polyphenylene oxide Substances 0.000 claims abstract description 18
- 229920000570 polyether Polymers 0.000 claims abstract description 18
- 239000003223 protective agent Substances 0.000 claims abstract description 15
- 239000002270 dispersing agent Substances 0.000 claims abstract description 14
- 239000003795 chemical substances by application Substances 0.000 claims abstract description 12
- 230000000149 penetrating effect Effects 0.000 claims abstract description 12
- RCEAADKTGXTDOA-UHFFFAOYSA-N OS(O)(=O)=O.CCCCCCCCCCCC[Na] Chemical compound OS(O)(=O)=O.CCCCCCCCCCCC[Na] RCEAADKTGXTDOA-UHFFFAOYSA-N 0.000 claims abstract description 11
- 238000005406 washing Methods 0.000 claims description 76
- HEMHJVSKTPXQMS-UHFFFAOYSA-M Sodium hydroxide Chemical compound [OH-].[Na+] HEMHJVSKTPXQMS-UHFFFAOYSA-M 0.000 claims description 48
- CDBYLPFSWZWCQE-UHFFFAOYSA-L Sodium Carbonate Chemical compound [Na+].[Na+].[O-]C([O-])=O CDBYLPFSWZWCQE-UHFFFAOYSA-L 0.000 claims description 26
- 238000011001 backwashing Methods 0.000 claims description 20
- 239000000463 material Substances 0.000 claims description 20
- 241000196324 Embryophyta Species 0.000 claims description 17
- 238000002156 mixing Methods 0.000 claims description 15
- 230000007935 neutral effect Effects 0.000 claims description 15
- UIIMBOGNXHQVGW-UHFFFAOYSA-M Sodium bicarbonate Chemical compound [Na+].OC([O-])=O UIIMBOGNXHQVGW-UHFFFAOYSA-M 0.000 claims description 14
- 238000011010 flushing procedure Methods 0.000 claims description 14
- 238000000034 method Methods 0.000 claims description 14
- 229910000029 sodium carbonate Inorganic materials 0.000 claims description 13
- 239000003513 alkali Substances 0.000 claims description 11
- MTHSVFCYNBDYFN-UHFFFAOYSA-N diethylene glycol Chemical compound OCCOCCO MTHSVFCYNBDYFN-UHFFFAOYSA-N 0.000 claims description 10
- 229910000030 sodium bicarbonate Inorganic materials 0.000 claims description 7
- 235000017557 sodium bicarbonate Nutrition 0.000 claims description 7
- UIIMBOGNXHQVGW-DEQYMQKBSA-M Sodium bicarbonate-14C Chemical compound [Na+].O[14C]([O-])=O UIIMBOGNXHQVGW-DEQYMQKBSA-M 0.000 claims description 6
- 229910052708 sodium Inorganic materials 0.000 claims description 6
- 239000011734 sodium Substances 0.000 claims description 6
- 241001122767 Theaceae Species 0.000 claims description 5
- 238000001816 cooling Methods 0.000 claims description 5
- 229920001577 copolymer Polymers 0.000 claims description 5
- 239000008236 heating water Substances 0.000 claims description 5
- 239000007788 liquid Substances 0.000 claims description 4
- WXZMFSXDPGVJKK-UHFFFAOYSA-N pentaerythritol Chemical compound OCC(CO)(CO)CO WXZMFSXDPGVJKK-UHFFFAOYSA-N 0.000 claims description 4
- DGAQECJNVWCQMB-PUAWFVPOSA-M Ilexoside XXIX Chemical group C[C@@H]1CC[C@@]2(CC[C@@]3(C(=CC[C@H]4[C@]3(CC[C@@H]5[C@@]4(CC[C@@H](C5(C)C)OS(=O)(=O)[O-])C)C)[C@@H]2[C@]1(C)O)C)C(=O)O[C@H]6[C@@H]([C@H]([C@@H]([C@H](O6)CO)O)O)O.[Na+] DGAQECJNVWCQMB-PUAWFVPOSA-M 0.000 claims description 3
- 230000004907 flux Effects 0.000 abstract description 20
- 230000000694 effects Effects 0.000 abstract description 18
- 238000011084 recovery Methods 0.000 abstract description 13
- 230000008901 benefit Effects 0.000 abstract description 5
- 230000000052 comparative effect Effects 0.000 description 17
- 239000002994 raw material Substances 0.000 description 17
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 10
- 239000003344 environmental pollutant Substances 0.000 description 10
- 231100000719 pollutant Toxicity 0.000 description 10
- 239000002253 acid Substances 0.000 description 7
- QAOWNCQODCNURD-UHFFFAOYSA-L Sulfate Chemical compound [O-]S([O-])(=O)=O QAOWNCQODCNURD-UHFFFAOYSA-L 0.000 description 5
- 230000035699 permeability Effects 0.000 description 5
- 230000002195 synergetic effect Effects 0.000 description 5
- 238000001514 detection method Methods 0.000 description 4
- 102000004169 proteins and genes Human genes 0.000 description 4
- 108090000623 proteins and genes Proteins 0.000 description 4
- 239000000126 substance Substances 0.000 description 4
- 239000005708 Sodium hypochlorite Substances 0.000 description 3
- 239000003153 chemical reaction reagent Substances 0.000 description 3
- KRKNYBCHXYNGOX-UHFFFAOYSA-N citric acid Chemical compound OC(=O)CC(O)(C(O)=O)CC(O)=O KRKNYBCHXYNGOX-UHFFFAOYSA-N 0.000 description 3
- 239000003292 glue Substances 0.000 description 3
- 229910021645 metal ion Inorganic materials 0.000 description 3
- 239000007800 oxidant agent Substances 0.000 description 3
- 230000001590 oxidative effect Effects 0.000 description 3
- 239000010865 sewage Substances 0.000 description 3
- -1 sodium fatty alcohol Chemical class 0.000 description 3
- SUKJFIGYRHOWBL-UHFFFAOYSA-N sodium hypochlorite Chemical compound [Na+].Cl[O-] SUKJFIGYRHOWBL-UHFFFAOYSA-N 0.000 description 3
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 description 2
- MHAJPDPJQMAIIY-UHFFFAOYSA-N Hydrogen peroxide Chemical compound OO MHAJPDPJQMAIIY-UHFFFAOYSA-N 0.000 description 2
- GRYLNZFGIOXLOG-UHFFFAOYSA-N Nitric acid Chemical compound O[N+]([O-])=O GRYLNZFGIOXLOG-UHFFFAOYSA-N 0.000 description 2
- DBMJMQXJHONAFJ-UHFFFAOYSA-M Sodium laurylsulphate Chemical compound [Na+].CCCCCCCCCCCCOS([O-])(=O)=O DBMJMQXJHONAFJ-UHFFFAOYSA-M 0.000 description 2
- 238000011109 contamination Methods 0.000 description 2
- 150000002191 fatty alcohols Chemical class 0.000 description 2
- 238000001914 filtration Methods 0.000 description 2
- 229910017604 nitric acid Inorganic materials 0.000 description 2
- 235000019333 sodium laurylsulphate Nutrition 0.000 description 2
- 230000005653 Brownian motion process Effects 0.000 description 1
- OFOBLEOULBTSOW-UHFFFAOYSA-N Propanedioic acid Natural products OC(=O)CC(O)=O OFOBLEOULBTSOW-UHFFFAOYSA-N 0.000 description 1
- NIXOWILDQLNWCW-UHFFFAOYSA-N acrylic acid group Chemical group C(C=C)(=O)O NIXOWILDQLNWCW-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000005537 brownian motion Methods 0.000 description 1
- 230000003139 buffering effect Effects 0.000 description 1
- 239000003599 detergent Substances 0.000 description 1
- 239000011976 maleic acid Substances 0.000 description 1
- 229940127554 medical product Drugs 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 150000003839 salts Chemical class 0.000 description 1
- 230000000087 stabilizing effect Effects 0.000 description 1
- VZCYOOQTPOCHFL-UHFFFAOYSA-N trans-butenedioic acid Natural products OC(=O)C=CC(O)=O VZCYOOQTPOCHFL-UHFFFAOYSA-N 0.000 description 1
- 238000010977 unit operation Methods 0.000 description 1
Classifications
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- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/83—Mixtures of non-ionic with anionic compounds
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D61/00—Processes of separation using semi-permeable membranes, e.g. dialysis, osmosis or ultrafiltration; Apparatus, accessories or auxiliary operations specially adapted therefor
- B01D61/14—Ultrafiltration; Microfiltration
- B01D61/145—Ultrafiltration
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D65/00—Accessories or auxiliary operations, in general, for separation processes or apparatus using semi-permeable membranes
- B01D65/02—Membrane cleaning or sterilisation ; Membrane regeneration
-
- 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
- B01D69/08—Hollow fibre membranes
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/02—Inorganic compounds ; Elemental compounds
- C11D3/04—Water-soluble compounds
- C11D3/044—Hydroxides or bases
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/02—Inorganic compounds ; Elemental compounds
- C11D3/04—Water-soluble compounds
- C11D3/10—Carbonates ; Bicarbonates
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/20—Organic compounds containing oxygen
- C11D3/2003—Alcohols; Phenols
- C11D3/2065—Polyhydric alcohols
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/20—Organic compounds containing oxygen
- C11D3/2068—Ethers
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/37—Polymers
- C11D3/3746—Macromolecular compounds obtained by reactions only involving carbon-to-carbon unsaturated bonds
- C11D3/3757—(Co)polymerised carboxylic acids, -anhydrides, -esters in solid and liquid compositions
- C11D3/3765—(Co)polymerised carboxylic acids, -anhydrides, -esters in solid and liquid compositions in liquid compositions
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/38—Products with no well-defined composition, e.g. natural products
- C11D3/382—Vegetable products, e.g. soya meal, wood flour, sawdust
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/164—Use of bases
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
- B01D—SEPARATION
- B01D2321/00—Details relating to membrane cleaning, regeneration, sterilization or to the prevention of fouling
- B01D2321/16—Use of chemical agents
- B01D2321/168—Use of other chemical agents
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/02—Anionic compounds
- C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
- C11D1/14—Sulfonic acids or sulfuric acid esters; Salts thereof derived from aliphatic hydrocarbons or mono-alcohols
- C11D1/146—Sulfuric acid esters
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/02—Anionic compounds
- C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
- C11D1/29—Sulfates of polyoxyalkylene ethers
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/02—Anionic compounds
- C11D1/34—Derivatives of acids of phosphorus
- C11D1/345—Phosphates or phosphites
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D1/00—Detergent compositions based essentially on surface-active compounds; Use of these compounds as a detergent
- C11D1/66—Non-ionic compounds
- C11D1/72—Ethers of polyoxyalkylene glycols
-
- C—CHEMISTRY; METALLURGY
- C11—ANIMAL OR VEGETABLE OILS, FATS, FATTY SUBSTANCES OR WAXES; FATTY ACIDS THEREFROM; DETERGENTS; CANDLES
- C11D—DETERGENT COMPOSITIONS; USE OF SINGLE SUBSTANCES AS DETERGENTS; SOAP OR SOAP-MAKING; RESIN SOAPS; RECOVERY OF GLYCEROL
- C11D2111/00—Cleaning compositions characterised by the objects to be cleaned; Cleaning compositions characterised by non-standard cleaning or washing processes
- C11D2111/10—Objects to be cleaned
- C11D2111/12—Soft surfaces, e.g. textile
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Wood Science & Technology (AREA)
- Oil, Petroleum & Natural Gas (AREA)
- Organic Chemistry (AREA)
- Inorganic Chemistry (AREA)
- Health & Medical Sciences (AREA)
- Emergency Medicine (AREA)
- Water Supply & Treatment (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The alkaline cleaning agent comprises, by weight, 45-65 parts of water, 25-35 parts of a pH regulator, 2-8 parts of a chelating dispersant, 2-10 parts of a membrane protective agent, 0.5-1.5 parts of plant polyphenol, 6-11 parts of a non-ionic penetrating agent, 1.5-2.5 parts of glycerol block polyether, 3.2-5.1 parts of fatty alcohol-polyoxyethylene ether, 6.4-10.2 parts of fatty alcohol-polyoxyethylene ether sodium sulfate and 8.5-11.5 parts of lauryl sodium sulfate. The alkaline cleaning agent enables the hollow fiber ultrafiltration membrane to have higher membrane flux recovery rate and good cleaning effect after the hollow fiber ultrafiltration membrane is polluted and cleaned for multiple times. And the alkaline cleaning agent also has the advantages of simple and convenient preparation, convenient control and convenient use.
Description
Technical Field
The application relates to the technical field of cleaning agent processing, in particular to an alkaline cleaning agent for a hollow fiber ultrafiltration membrane, and a preparation method and application thereof.
Background
The ultrafiltration membrane is a microporous filtration membrane with a pore size specification of 0.001-0.02 μm, and is used in unit operations of biological products, medical products, sewage treatment and the like. When the hollow fiber ultrafiltration membrane is used in an MBR (membrane bioreactor) treatment system, raw water flows on the outer side or inner cavity of the hollow fiber under pressure to form an external pressure type and an internal pressure type respectively, ultrafiltration is a dynamic filtration process, clear water is discharged through the hollow fiber, and trapped substances can be discharged along with concentrated water, so that the aim of purifying a water body is fulfilled.
After the hollow fiber ultrafiltration membrane continuously operates for a period of time, pollutants in raw water inevitably pollute the ultrafiltration membrane, so that the hollow fiber ultrafiltration membrane needs to be cleaned regularly to keep the permeation flux of the hollow fiber ultrafiltration membrane and prolong the service life of the hollow fiber ultrafiltration membrane. The cleaning of the hollow fiber ultrafiltration membrane is divided into physical cleaning and chemical cleaning. The physical cleaning mode can quickly recover the water permeability of the hollow fiber ultrafiltration membrane to a certain degree in a short time, the membrane flux recovery rate is low, and the membrane flux reduction rate of the reused hollow fiber ultrafiltration membrane is high. The chemical cleaning mode is to clean pollutants on the surface of the hollow fiber ultrafiltration membrane by using chemical reagents, wherein the commonly used chemical reagents are hydrochloric acid, sodium hydroxide, sodium hypochlorite, hydrogen peroxide, citric acid and the like, and the chemical reagents can have a good removal effect on metal ions, inorganic salts and inorganic scale pollutants, but are difficult to remove organic proteins and the like, and the membrane flux recovery rate of the cleaned hollow fiber ultrafiltration membrane is low after the hollow fiber ultrafiltration membrane is polluted and cleaned for multiple times.
Disclosure of Invention
The alkaline cleaning agent for the hollow fiber ultrafiltration membrane is used for enabling the hollow fiber ultrafiltration membrane to have high membrane flux recovery rate after the hollow fiber ultrafiltration membrane is polluted and cleaned for multiple times, and has a good cleaning effect on the hollow fiber ultrafiltration membrane.
The second purpose of the application is to provide a preparation method of the alkaline cleaning agent for the hollow fiber ultrafiltration membrane, which has the advantages of simple preparation and convenient control.
The third purpose of the application is to provide the application of the alkaline cleaning agent for the hollow fiber ultrafiltration membrane, which has the advantage of simple and convenient use.
The above object of the present application is achieved by the following technical solutions:
an alkaline cleaning agent for a hollow fiber ultrafiltration membrane comprises, by weight, 45-65 parts of water, 25-35 parts of a pH regulator, 2-8 parts of a chelating dispersant, 2-10 parts of a membrane protective agent, 0.5-1.5 parts of plant polyphenol, 6-11 parts of a non-ionic penetrating agent, 1.5-2.5 parts of glycerol block polyether, 3.2-5.1 parts of fatty alcohol-polyoxyethylene ether, 6.4-10.2 parts of fatty alcohol-polyoxyethylene ether sodium sulfate and 8.5-11.5 parts of lauryl sodium sulfate.
By adopting the technical scheme, after five times of pollution and five times of cleaning are carried out on the hollow fiber ultrafiltration membrane, the membrane flux recovery rate of the hollow fiber ultrafiltration membrane is between 78.47 and 81.30 percent, compared with the method for cleaning the hollow fiber ultrafiltration membrane by adopting the traditional acid washing and alkali washing, the membrane flux recovery rate of the hollow fiber ultrafiltration membrane is 71.10 percent, and the hollow fiber ultrafiltration membrane is cleaned by adopting the traditional acid washing, alkali washing, acid washing and oxidant, the membrane flux recovery rate of the hollow fiber ultrafiltration membrane is 77.90 percent.
More preferably, the pH regulator comprises sodium hydroxide, sodium carbonate and sodium bicarbonate, and the weight ratio of the sodium hydroxide, the sodium carbonate and the sodium bicarbonate is 10 (3-4) to (1-2).
By adopting the technical scheme, the pH regulator is optimized, so that the alkaline cleaning agent is alkaline, the pH value of the alkaline cleaning agent is buffered and stabilized by adding sodium carbonate and sodium bicarbonate, the viscosity of the alkaline cleaning agent is reduced, and the storage stability of the alkaline cleaning agent is improved.
More preferably, the fatty alcohol-polyoxyethylene ether is fatty alcohol-polyoxyethylene ether AEO-15, and the fatty alcohol-polyoxyethylene ether sodium sulfate is fatty alcohol-polyoxyethylene ether sodium sulfate AES-70.
More preferably, the weight ratio of the fatty alcohol-polyoxyethylene ether to the fatty alcohol-polyoxyethylene ether sodium sulfate is 1: 2.
By adopting the technical scheme, the fatty alcohol-polyoxyethylene ether AEO-15 and the fatty alcohol-polyoxyethylene ether sodium sulfate AES-70 have good compatibility, the hydrophilicity of the fatty alcohol-polyoxyethylene ether AEO-15 is increased, the removal of pollutants on the surface of the hollow fiber ultrafiltration membrane is facilitated through the synergistic effect of the fatty alcohol-polyoxyethylene ether AEO-15 and the fatty alcohol-polyoxyethylene ether sodium sulfate AES-70, and the cleaning effect of the alkaline cleaning agent on the hollow fiber ultrafiltration membrane is increased.
More preferably, the plant polyphenol is tea polyphenol.
More preferably, the non-ionic penetrant is an alkali-resistant penetrant OEP-70.
More preferably, the chelating dispersant is an acrylic maleic acid copolymer.
By adopting the technical scheme, tea polyphenol can be subjected to a complex reaction with protein, the acrylic acid maleic acid copolymer is subjected to a complex reaction with metal ions, the alkali-resistant penetrant OEP-70 has good permeability and can damage a glue layer formed by pollutants on the surface of the hollow fiber ultrafiltration membrane, and the cleaning effect of the alkali cleaning agent on the hollow fiber ultrafiltration membrane is improved by optimizing the plant polyphenol, the nonionic penetrant and the chelating dispersant.
More preferably, the membrane protective agent is one or more of glycerol, diethylene glycol and pentaerythritol.
By adopting the technical scheme, the glycerol, the diglycol and the pentaerythritol not only increase the uniformity of the alkaline cleaning agent, but also play a role in protecting the ultrafiltration membrane, increase the permeability of the alkaline cleaning agent and improve the use and cleaning effect of the alkaline cleaning agent on the ultrafiltration membrane.
The second application object of the present application is achieved by the following technical scheme:
the preparation method of the alkaline cleaning agent for the hollow fiber ultrafiltration membrane comprises the following steps:
s1, heating water to 50-70 ℃, adding a non-ionic penetrating agent, glycerol block polyether, fatty alcohol-polyoxyethylene ether sodium sulfate and lauryl sodium sulfate, and uniformly mixing to obtain a mixed material a;
s2, adding a chelating dispersant, a film protective agent and plant polyphenol into the mixed material a to obtain a mixed material b;
and S3, adding a pH regulator into the mixed material b, uniformly mixing, and cooling to obtain the alkaline cleaning agent.
By adopting the technical scheme, water is heated, so that the alkaline cleaning agent is conveniently prepared, the non-ionic penetrating agent, the glycerol block polyether, the fatty alcohol-polyoxyethylene ether sodium sulfate and the lauryl sodium sulfate are added into the water, then the chelating dispersant, the membrane protective agent and the plant polyphenol are added, so that the raw materials are conveniently mixed, the raw materials are uniformly mixed, and then the pH regulator is added, so that the alkaline cleaning agent is prepared.
The third objective of the present application is achieved by the following technical solutions:
an application of the alkaline cleaning agent for the hollow fiber ultrafiltration membrane is disclosed, wherein the alkaline cleaning agent is used for cleaning the hollow fiber ultrafiltration membrane; the cleaning method of the hollow fiber ultrafiltration membrane comprises the following steps:
a1, adding an alkaline cleaning agent into water, wherein the volume addition amount of the alkaline cleaning agent is 1-2%, and uniformly mixing to prepare a cleaning solution;
a2, backwashing the hollow fiber ultrafiltration membrane by using water, wherein the flushing flow is 60-80L/h, the flushing temperature is 30-40 ℃, and the pH value of outlet water is neutral;
a3, performing circulating back washing on the hollow fiber ultrafiltration membrane by using a washing liquid, wherein the washing flow is 100-120L/h, the washing pressure is 0.11-0.13MPa, the washing temperature is 70-90 ℃, and the washing time is 50-120 min;
a4, washing the hollow fiber ultrafiltration membrane with water, wherein the washing flow is 60-80L/h, the washing temperature is 30-40 ℃, and the pH value of the effluent is neutral.
By adopting the technical scheme, firstly, the ultrafiltration membrane is subjected to water backwashing, and most of pollutants on the surface of the hollow fiber ultrafiltration membrane are removed by the impact force of water; then, circulating back washing is carried out on the hollow fiber ultrafiltration membrane by utilizing a cleaning solution, the pollutants on the surface of the ultrafiltration membrane are cleaned by an alkaline cleaning agent in the cleaning solution, and the use amount of the cleaning solution is reduced because the cleaning solution is subjected to circulating treatment; and then washing the hollow fiber ultrafiltration membrane by using water to remove the residual cleaning solution on the surface of the hollow fiber ultrafiltration membrane and make the effluent of the hollow fiber ultrafiltration membrane neutral. In the cleaning method, the cleaning solution is heated and pressurized, so that Brownian motion among molecules in the cleaning solution is increased, the cleaning effect of the cleaning solution on the hollow fiber ultrafiltration membrane is improved, and the membrane flux recovery rate after the hollow fiber ultrafiltration membrane is cleaned is increased.
In summary, the present application has the following beneficial effects:
the alkaline cleaning agent for the hollow fiber ultrafiltration membrane has the advantages that the alkaline cleaning agent for the hollow fiber ultrafiltration membrane has high membrane flux recovery rate and good cleaning effect on the hollow fiber ultrafiltration membrane after the hollow fiber ultrafiltration membrane is polluted and cleaned for multiple times through the synergistic effect of raw materials.
Secondly, tea polyphenol can perform a complex reaction with protein, acrylic acid maleic acid copolymer and metal ions perform a complex reaction, the alkali-resistant penetrating agent OEP-70 has good permeability and destroys a glue layer formed by pollutants on the surface of the hollow fiber ultrafiltration membrane, the fatty alcohol-polyoxyethylene ether AEO-15 and the fatty alcohol-polyoxyethylene ether sodium sulfate AES-70 have good compatibility, the hydrophilicity of the fatty alcohol-polyoxyethylene ether AEO-15 is increased, and the cleaning effect of the alkaline cleaning agent on the hollow fiber ultrafiltration membrane is increased through the synergistic effect of the raw materials.
And thirdly, optimizing the pH regulator, adding sodium carbonate and sodium bicarbonate into the sodium hydroxide, wherein the sodium carbonate and the sodium bicarbonate play a role in buffering and stabilizing the pH value of the alkaline cleaning agent, reducing the viscosity of the alkaline cleaning agent and increasing the storage stability of the alkaline cleaning agent.
And fourthly, the application of the alkaline cleaning agent for the hollow fiber ultrafiltration membrane has good cleaning effect on the hollow fiber ultrafiltration membrane, and the alkaline cleaning agent does not need acid washing or oxidant washing in the cleaning process and has the advantage of simple and convenient use.
Detailed Description
The present application will be described in further detail with reference to examples.
TABLE 1 example the content of each raw material (unit: kg) of the tundish impact plate
| Raw materials | Example 1 | Example 2 | Example 3 |
| Water (W) | 45 | 55 | 65 |
| pH regulator | 25 | 35 | 35 |
| Chelating dispersants | 8 | 4 | 2 |
| Film protecting agent | 2 | 5 | 10 |
| Plant polyphenols | 0.5 | 1.1 | 1.5 |
| Non-ionic penetrant | 11 | 9 | 6 |
| Glycerol block polyether | 2.5 | 1.9 | 1.5 |
| Fatty alcohol polyoxyethylene ether | 3.2 | 4.4 | 5.1 |
| Sodium fatty alcohol Ether sulfate | 6.4 | 8.8 | 10.2 |
| Sodium dodecyl sulfate | 11.5 | 10.5 | 8.5 |
Raw materials
The non-ionic penetrant is alkali-resistant penetrant OEP-70, and the alkali-resistant penetrant OEP-70 is selected from Haian petrochemical plant of Jiangsu province; the glycerol block polyether is glycerol block polyether DF103T, and the glycerol block polyether DF103T is selected from the group consisting of Dow; the fatty alcohol-polyoxyethylene ether is fatty alcohol-polyoxyethylene ether AEO-15, and the fatty alcohol-polyoxyethylene ether AEO-15 is selected from Basff; the sodium fatty alcohol polyoxyethylene ether sulfate is sodium fatty alcohol polyoxyethylene ether sulfate AES-70, and the sodium fatty alcohol polyoxyethylene ether sulfate AES-70 is selected from North petrochemical Hezhou division; sodium lauryl sulfate is selected from Shanghai blue run chemical Co., Ltd; the chelating dispersant is acrylic acid maleic acid copolymer selected from Shanghai blue run chemical Co., Ltd; the plant polyphenol is tea polyphenol selected from Dewang chemical industry Co., Ltd.
Example 1
An alkaline cleaning agent for a hollow fiber ultrafiltration membrane is shown in table 1 in the raw material ratio.
Wherein the pH regulator comprises sodium hydroxide, sodium carbonate and sodium bicarbonate, and the weight ratio of the sodium hydroxide to the sodium carbonate to the sodium bicarbonate is 10:3: 1; the membrane protective agent is glycerol.
A preparation method of an alkaline cleaning agent for a hollow fiber ultrafiltration membrane comprises the following steps:
s1, heating water to 70 ℃, adding a non-ionic penetrating agent, glycerol block polyether, fatty alcohol-polyoxyethylene ether sodium sulfate and lauryl sodium sulfate, and uniformly mixing to obtain a mixed material a;
s2, adding a chelating dispersant, a film protective agent and plant polyphenol into the mixed material a to obtain a mixed material b;
and S3, adding a pH regulator into the mixed material b, uniformly mixing, and cooling to obtain the alkaline cleaning agent.
Example 2
An alkaline cleaning agent for a hollow fiber ultrafiltration membrane is shown in table 1 in the raw material ratio.
Wherein the pH regulator comprises sodium hydroxide, sodium carbonate and sodium bicarbonate, and the weight ratio of the sodium hydroxide to the sodium carbonate to the sodium bicarbonate is 10:3.5: 1.5; the membrane protective agent is pentaerythritol.
A preparation method of an alkaline cleaning agent for a hollow fiber ultrafiltration membrane comprises the following steps:
s1, heating water to 60 ℃, adding a non-ionic penetrating agent, glycerol block polyether, fatty alcohol-polyoxyethylene ether sodium sulfate and lauryl sodium sulfate, and uniformly mixing to obtain a mixed material a;
s2, adding a chelating dispersant, a film protective agent and plant polyphenol into the mixed material a to obtain a mixed material b;
and S3, adding a pH regulator into the mixed material b, uniformly mixing, and cooling to obtain the alkaline cleaning agent.
Example 3
An alkaline cleaning agent for a hollow fiber ultrafiltration membrane is shown in table 1 in the raw material ratio.
Wherein the pH regulator comprises sodium hydroxide, sodium carbonate and sodium bicarbonate, and the weight ratio of the sodium hydroxide to the sodium carbonate to the sodium bicarbonate is 10:4: 2; the film protecting agent is diethylene glycol.
A preparation method of an alkaline cleaning agent for a hollow fiber ultrafiltration membrane comprises the following steps:
s1, heating water to 50 ℃, adding a non-ionic penetrating agent, glycerol block polyether, fatty alcohol-polyoxyethylene ether sodium sulfate and lauryl sodium sulfate, and uniformly mixing to obtain a mixed material a;
s2, adding a chelating dispersant, a film protective agent and plant polyphenol into the mixed material a to obtain a mixed material b;
and S3, adding a pH regulator into the mixed material b, uniformly mixing, and cooling to obtain the alkaline cleaning agent.
Example 4
An application of alkaline cleaning agent for hollow fiber ultrafiltration membrane is disclosed, wherein the alkaline cleaning agent is used for cleaning the hollow fiber ultrafiltration membrane.
The cleaning method of the hollow fiber ultrafiltration membrane comprises the following steps:
a1, adding an alkaline cleaning agent into water, wherein the volume addition amount of the alkaline cleaning agent is 1%, and uniformly mixing to prepare a cleaning solution;
a2, backwashing the hollow fiber ultrafiltration membrane by using water, wherein the flushing flow is 60L/h, the flushing temperature is 40 ℃, and the pH value of outlet water is neutral;
a3, performing circulating back washing on the hollow fiber ultrafiltration membrane by using a cleaning solution, wherein the washing flow is 100L/h, the washing pressure is 0.11MPa, the cleaning temperature is 90 ℃, and the cleaning time is 50 min;
a4, washing the hollow fiber ultrafiltration membrane with water at the washing flow rate of 60L/h and the washing temperature of 40 ℃ until the pH value of the effluent is neutral.
Example 5
An application of alkaline cleaning agent for hollow fiber ultrafiltration membrane is disclosed, wherein the alkaline cleaning agent is used for cleaning the hollow fiber ultrafiltration membrane.
The cleaning method of the hollow fiber ultrafiltration membrane comprises the following steps:
a1, adding an alkaline cleaning agent into water, wherein the volume addition amount of the alkaline cleaning agent is 1.5%, and uniformly mixing to prepare a cleaning solution;
a2, backwashing the hollow fiber ultrafiltration membrane by using water, wherein the flushing flow is 70L/h, the flushing temperature is 35 ℃, and the pH value of outlet water is neutral;
a3, performing circulating back washing on the hollow fiber ultrafiltration membrane by using a washing liquid, wherein the washing flow is 110L/h, the washing pressure is 0.12MPa, the washing temperature is 80 ℃, and the washing time is 90 min;
a4, washing the hollow fiber ultrafiltration membrane by water, wherein the washing flow is 70L/h, the washing temperature is 35 ℃, and the pH value of the effluent is neutral.
Example 6
An application of alkaline cleaning agent for hollow fiber ultrafiltration membrane is disclosed, wherein the alkaline cleaning agent is used for cleaning the hollow fiber ultrafiltration membrane.
The cleaning method of the hollow fiber ultrafiltration membrane comprises the following steps:
a1, adding an alkaline cleaning agent into water, wherein the volume addition amount of the alkaline cleaning agent is 2%, and uniformly mixing to prepare a cleaning solution;
a2, backwashing the hollow fiber ultrafiltration membrane by using water, wherein the flushing flow is 80L/h, the flushing temperature is 40 ℃, and the pH value of outlet water is neutral;
a3, performing circulating back washing on the hollow fiber ultrafiltration membrane by using a washing liquid, wherein the washing flow is 120L/h, the washing pressure is 0.13MPa, the washing temperature is 70 ℃, and the washing time is 120 min;
a4, washing the hollow fiber ultrafiltration membrane by water, wherein the washing flow is 80L/h, the washing temperature is 40 ℃, and the pH value of the effluent is neutral.
Comparative example 1
The difference between the comparative example and the example 2 is that plant polyphenol is not added in the raw materials of the alkaline cleaning agent.
Comparative example 2
The difference between the comparative example and the example 2 is that the raw material of the alkaline cleaning agent is not added with glycerol block polyether.
Comparative example 3
The difference between the comparative example and the example 2 is that no fatty alcohol-polyoxyethylene ether or sodium fatty alcohol-polyoxyethylene ether sulfate is added in the raw materials of the alkaline cleaning agent.
Comparative example 4
The alkaline cleaning agent for the hollow fiber ultrafiltration membrane is different from the alkaline cleaning agent in the embodiment 2 in that a non-ionic penetrating agent, glycerol block polyether, fatty alcohol-polyoxyethylene ether sodium sulfate and lauryl sodium sulfate are not added in the raw materials of the alkaline cleaning agent.
Comparative example 5
A method for cleaning a hollow fiber ultrafiltration membrane comprises the following steps:
a1, backwashing the hollow fiber ultrafiltration membrane by using water, wherein the flushing flow is 70L/h, the flushing temperature is 35 ℃, and the pH value of outlet water is neutral;
a2, performing circulating back washing on the hollow fiber ultrafiltration membrane by hydrochloric acid solution, wherein the concentration of the hydrochloric acid solution is 0.5%, the washing flow is 110L/h, the washing pressure is 0.12MPa, the washing temperature is 80 ℃, and the washing time is 45 min;
a3, performing circulating back washing on the hollow fiber ultrafiltration membrane by using a sodium hydroxide solution, wherein the concentration of the sodium hydroxide solution is 0.5%, the washing flow is 110L/h, the washing pressure is 0.12MPa, the washing temperature is 80 ℃, and the washing time is 45 min;
a4, washing the hollow fiber ultrafiltration membrane by water, wherein the washing flow is 70L/h, the washing temperature is 35 ℃, and the pH value of the effluent is neutral.
Comparative example 6
A method for cleaning a hollow fiber ultrafiltration membrane comprises the following steps:
a1, backwashing the hollow fiber ultrafiltration membrane by using water, wherein the flushing flow is 70L/h, the flushing temperature is 35 ℃, and the pH value of outlet water is neutral;
a2, carrying out circulating back washing on the hollow fiber ultrafiltration membrane by using a hydrochloric acid solution, wherein the concentration of the hydrochloric acid solution is 0.4%, the washing flow is 110L/h, the washing pressure is 0.12MPa, the washing temperature is 80 ℃, and the washing time is 35 min;
a3, performing circulating back washing on the hollow fiber ultrafiltration membrane by using a sodium hydroxide solution, wherein the concentration of the sodium hydroxide solution is 0.4%, the washing flow is 110L/h, the washing pressure is 0.12MPa, the washing temperature is 80 ℃, and the washing time is 35 min;
a4, performing circulating back washing on the hollow fiber ultrafiltration membrane by using a nitric acid solution, wherein the concentration of the nitric acid solution is 0.1%, the washing flow is 110L/h, the washing pressure is 0.12MPa, the washing temperature is 80 ℃, and the washing time is 10 min;
a5, performing circulating back washing on the hollow fiber ultrafiltration membrane by using a sodium hypochlorite solution, wherein the concentration of the sodium hypochlorite solution is 0.1%, the washing flow is 110L/h, the washing pressure is 0.12MPa, the washing temperature is 80 ℃, and the washing time is 10 min;
a6, washing the hollow fiber ultrafiltration membrane by water, wherein the washing flow is 70L/h, the washing temperature is 35 ℃, and the pH value of the effluent is neutral.
Detection of use effect of alkaline cleaner
The alkaline cleaning agent obtained in examples 1-3 and comparative examples 1-4 is used for cleaning the polluted hollow fiber ultrafiltration membrane by the application method of example 5, the alkaline cleaning agent is circularly used for continuous operation in the MBR, the hollow fiber ultrafiltration membrane is polluted and cleaned for multiple times, the water flux before and after the hollow fiber ultrafiltration membrane is cleaned is detected, and the detection result is shown in Table 2.
Wherein the initial water flux of the uncontaminated hollow fiber ultrafiltration membrane is 35.3L/m2h。
TABLE 2 test results
As can be seen from table 2, the alkaline cleaning agent of the present application has a membrane flux recovery rate of 96.03-96.88% after the hollow fiber ultrafiltration membrane is subjected to primary contamination and primary cleaning, and has a membrane flux recovery rate of 78.47-81.30% after the hollow fiber ultrafiltration membrane is subjected to five times of contamination and five times of cleaning, which shows that the alkaline cleaning agent has a good cleaning effect on the hollow fiber ultrafiltration membrane.
By comparing the example 2 with the comparative examples 1 to 4, it can be seen that the cleaning effect of the alkaline cleaning agent on the hollow fiber ultrafiltration membrane can be improved by adding the plant polyphenol, the glycerol block polyether, the fatty alcohol-polyoxyethylene ether and the fatty alcohol-polyoxyethylene ether sodium sulfate into the raw materials of the alkaline cleaning agent, which is probably because the plant polyphenol can perform a complex reaction with the protein; the glycerol block polyether has good permeability, can damage a glue layer formed by pollutants on the surface of the hollow fiber ultrafiltration membrane, increases the wettability of the hollow fiber ultrafiltration membrane, and also has good defoaming effect; the fatty alcohol-polyoxyethylene ether AEO-15 and the fatty alcohol-polyoxyethylene ether sodium sulfate AES-70 have good compatibility, the hydrophilicity of the fatty alcohol-polyoxyethylene ether AEO-15 is increased, and the cleaning effect of the alkaline cleaning agent on the hollow fiber ultrafiltration membrane is improved through the synergistic effect of the fatty alcohol-polyoxyethylene ether AEO-15 and the fatty alcohol-polyoxyethylene ether sodium sulfate AES-70. The raw materials of the alkaline cleaning agent are added with the nonionic penetrating agent, the glycerol block polyether, the fatty alcohol-polyoxyethylene ether sodium sulfate and the lauryl sodium sulfate, so that the cleaning effect of the alkaline cleaning agent on the hollow fiber ultrafiltration membrane is obviously improved, mainly due to the synergistic effect of the raw materials.
Detection of alkaline detergent usage
The hollow fiber ultrafiltration membrane is used for continuous operation and application in MBR of a certain sewage treatment plant in Shanghai, pollutants in sewage pollute the hollow fiber ultrafiltration membrane, the application methods of examples 4-6 and comparative examples 5-6 are used for cleaning the polluted hollow fiber ultrafiltration membrane, the cleaned hollow fiber ultrafiltration membrane is circularly used for continuous operation in MBR, the hollow fiber ultrafiltration membrane is polluted five times, then the water flux of the hollow fiber ultrafiltration membrane before and after being cleaned five times is detected, and the detection result is shown in Table 3.
The alkaline cleaners used in examples 4 to 6 were the alkaline cleaners prepared in example 2.
TABLE 3 test results
| Detecting items | Water flux/(L/m) before washing2h) | Water flux/(L/m) after cleaning2h) | Membrane flux recovery/(%) |
| Example 4 | 16.2 | 28.4 | 80.45 |
| Example 5 | 16.3 | 28.7 | 81.30 |
| Example 6 | 16.2 | 28.8 | 81.59 |
| Comparative example 5 | 16.1 | 25.1 | 71.10 |
| Comparative example 6 | 16.3 | 27.5 | 77.90 |
As can be seen from Table 3, the alkaline cleaning agent disclosed by the application has the membrane flux recovery rate of 80.45-81.59% after five times of pollution and five times of cleaning of the hollow fiber ultrafiltration membrane, and shows that the alkaline cleaning agent has a good cleaning effect on the hollow fiber ultrafiltration membrane.
By comparing the example 5 with the comparative examples 5-6, the example 5 adopts the cleaning method, the comparative example 5 adopts the traditional acid cleaning and alkali cleaning to clean the hollow fiber ultrafiltration membrane, and the comparative example 6 adopts the traditional acid cleaning, alkali cleaning, acid cleaning and oxidant cleaning to clean the hollow fiber ultrafiltration membrane, so that the cleaning method can be seen to obviously improve the cleaning effect on the hollow fiber ultrafiltration membrane.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.
Claims (4)
1. The application of the alkaline cleaning agent for the hollow fiber ultrafiltration membrane is characterized in that: the alkaline cleaning agent is used for cleaning the hollow fiber ultrafiltration membrane; the cleaning method of the hollow fiber ultrafiltration membrane comprises the following steps:
a1, adding an alkaline cleaning agent into water, wherein the volume addition amount of the alkaline cleaning agent is 1-2%, and uniformly mixing to prepare a cleaning solution;
a2, backwashing the hollow fiber ultrafiltration membrane by using water, wherein the flushing flow is 60-80L/h, the flushing temperature is 30-40 ℃, and the pH value of outlet water is neutral;
a3, performing circulating back washing on the hollow fiber ultrafiltration membrane by using a washing liquid, wherein the washing flow is 100-120L/h, the washing pressure is 0.11-0.13MPa, the washing temperature is 70-90 ℃, and the washing time is 50-120 min;
a4, washing the hollow fiber ultrafiltration membrane with water, wherein the washing flow is 60-80L/h, the washing temperature is 30-40 ℃, and the pH value of the effluent is neutral;
the alkaline cleaning agent for the hollow fiber ultrafiltration membrane comprises, by weight, 45-65 parts of water, 25-35 parts of a pH regulator, 2-8 parts of a chelating dispersant, 2-10 parts of a membrane protective agent, 0.5-1.5 parts of plant polyphenol, 6-11 parts of a non-ionic penetrating agent, 1.5-2.5 parts of glycerol block polyether, 3.2-5.1 parts of fatty alcohol-polyoxyethylene ether, 6.4-10.2 parts of fatty alcohol-polyoxyethylene ether sodium sulfate and 8.5-11.5 parts of lauryl sodium sulfate;
the fatty alcohol-polyoxyethylene ether is fatty alcohol-polyoxyethylene ether AEO-15, the fatty alcohol-polyoxyethylene ether sodium sulfate is sodium aliphatate AES-70, and the weight ratio of the fatty alcohol-polyoxyethylene ether to the fatty alcohol-polyoxyethylene ether sodium sulfate is 1: 2;
the plant polyphenol is tea polyphenol, and the non-ionic penetrant is alkali-resistant penetrant OEP-70;
the film protective agent is one or more of glycerol, diethylene glycol and pentaerythritol.
2. The application of the alkaline cleaning agent for the hollow fiber ultrafiltration membrane according to claim 1 is characterized in that: the pH regulator comprises sodium hydroxide, sodium carbonate and sodium bicarbonate, wherein the weight ratio of the sodium hydroxide to the sodium carbonate to the sodium bicarbonate is 10 (3-4) to 1-2.
3. The application of the alkaline cleaning agent for the hollow fiber ultrafiltration membrane according to claim 1 is characterized in that: the chelating dispersant is acrylic acid-maleic acid copolymer.
4. The application of the alkaline cleaning agent for the hollow fiber ultrafiltration membrane according to claim 1 is characterized in that: the preparation method of the alkaline cleaning agent for the hollow fiber ultrafiltration membrane comprises the following steps:
s1, heating water to 50-70 ℃, adding a non-ionic penetrating agent, glycerol block polyether, fatty alcohol-polyoxyethylene ether sodium sulfate and lauryl sodium sulfate, and uniformly mixing to obtain a mixed material a;
s2, adding a chelating dispersant, a film protective agent and plant polyphenol into the mixed material a to obtain a mixed material b;
and S3, adding a pH regulator into the mixed material b, uniformly mixing, and cooling to obtain the alkaline cleaning agent.
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