CN110577859A - Cleaning agent for DTRO (draw texturing yarn) membrane and preparation and use methods thereof - Google Patents
Cleaning agent for DTRO (draw texturing yarn) membrane and preparation and use methods thereof Download PDFInfo
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- CN110577859A CN110577859A CN201910909787.6A CN201910909787A CN110577859A CN 110577859 A CN110577859 A CN 110577859A CN 201910909787 A CN201910909787 A CN 201910909787A CN 110577859 A CN110577859 A CN 110577859A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B3/00—Cleaning by methods involving the use or presence of liquid or steam
- B08B3/04—Cleaning involving contact with liquid
- B08B3/08—Cleaning involving contact with liquid the liquid having chemical or dissolving effect
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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
- C11D1/02—Anionic compounds
- C11D1/12—Sulfonic acids or sulfuric acid esters; Salts thereof
- C11D1/22—Sulfonic acids or sulfuric acid esters; Salts thereof derived from aromatic compounds
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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
- 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
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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
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/02—Inorganic compounds ; Elemental compounds
- C11D3/04—Water-soluble compounds
- C11D3/046—Salts
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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
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/02—Inorganic compounds ; Elemental compounds
- C11D3/04—Water-soluble compounds
- C11D3/06—Phosphates, including polyphosphates
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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
- 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
- C11D3/2006—Monohydric alcohols
- C11D3/201—Monohydric alcohols linear
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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
- 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
- C11D3/2006—Monohydric alcohols
- C11D3/2017—Monohydric alcohols branched
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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
- C11D3/00—Other compounding ingredients of detergent compositions covered in group C11D1/00
- C11D3/16—Organic compounds
- C11D3/26—Organic compounds containing nitrogen
- C11D3/30—Amines; Substituted amines ; Quaternized amines
-
- 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
- C11D3/26—Organic compounds containing nitrogen
- C11D3/33—Amino carboxylic acids
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- Oil, Petroleum & Natural Gas (AREA)
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- General Chemical & Material Sciences (AREA)
- Separation Using Semi-Permeable Membranes (AREA)
Abstract
The invention belongs to the field of sewage treatment agents, and particularly relates to a preparation method and a use method of a membrane cleaning agent. Aiming at the problems that the membrane for membrane treatment of the existing landfill leachate treatment system is polluted by sulfur and no special effective membrane cleaning agent exists, the invention provides a membrane cleaning agent, which comprises the following components: the membrane cleaning agent is suitable for nanofiltration, microfiltration, RO, DTRO and SRO systems, and can effectively remove organic and inorganic composite pollutants.
Description
Technical Field
The invention belongs to the field of sewage treatment agents, and particularly relates to a DTRO (draw texturing yarn) membrane cleaning agent and preparation and use methods thereof.
Background
The landfill leachate is high-concentration organic wastewater which has complex components and large water quality and water quantity change. The sources of the landfill leachate mainly comprise direct precipitation, surface runoff, surface irrigation, underground water, water of the garbage, water in a covering material and the garbageWater produced by biochemical reactions, and the like. The factors influencing the components of the landfill leachate mainly comprise: the garbage composition, the site climatic conditions, the hydrogeological rainfall conditions of the site, the landfill conditions, the landfill time and the like. The change of the water quality and the water quantity of the landfill leachate is large, and the change rule is complex. Chemical oxygen demand CODcr, biological oxygen demand BOD for five days5The content of ammonia nitrogen is high, and along with the extension of landfill time, organic nitrogen in the rubbish is converted into inorganic nitrogen, and the mass concentration of ammonia nitrogen is increased. With the start of the pollution control standard of domestic refuse landfill (GB16889-2008), the traditional landfill leachate treatment adopts a single biochemical treatment method, which can not meet the water outlet requirement, and people turn the attention to a more efficient membrane separation technology. The membrane separation technology applied to the treatment of percolate mainly comprises ultrafiltration, nanofiltration, microfiltration, Reverse Osmosis (RO), a disc tube type reverse osmosis membrane (DTRO), a super reverse osmosis membrane (SRO) and the like, and most of percolate treatment adopts two or more than two membrane combination processes to ensure that the quality of effluent reaches the standard.
in the practical application process, the conditions of sulfur pollution besides common organic pollution, inorganic pollution and microbial pollution are found when nanofiltration, RO, DTRO and SRO are used for treating the landfill leachate. The landfill leachate is bred and propagated by sulfate reducing bacteria in the anaerobic fermentation and biological treatment anaerobic stages of a landfill site, sulfate radicals are converted into sulfides, the sulfides are gradually oxidized into sulfur particles in an intermediate water tank and a membrane system after entering the membrane system, the sulfur particles are accumulated on the surfaces of a filter, a membrane channel and a membrane to form a compact pollution layer, and finally membrane fouling is caused, so that the operation efficiency and the service life of the membrane are seriously influenced. Aiming at the condition of sulfur pollution, the conventional acidic and alkaline cleaning agents lack pertinence at present, have poor cleaning effect and even cause membrane elements to be scrapped.
At present, the cleaning effect of the existing acidic cleaning agent and alkaline cleaning agent on sulfur pollution is poor.
Disclosure of Invention
The technical problem to be solved by the invention is as follows: the prior membrane used for membrane treatment of a landfill leachate treatment system is polluted, and the problem of no special and effective membrane cleaning agent is solved.
The technical scheme for solving the technical problems comprises the following steps: a membrane cleaning agent is provided. The membrane cleaning agent comprises the following components: 55-60 percent of deionized water, 3-9 percent of polyphosphate, 3-6 percent of chelating agent, 20 percent of sodium hydroxide, 5 percent of sodium carbonate, 1 percent of sodium dodecyl benzene sulfonate, 1-3 percent of small molecular alcohol and 1-3 percent of alcohol amine by mass,
The invention also provides a preparation method of the membrane cleaning agent, which comprises the following steps:
Weighing 55-60% of deionized water in a reaction kettle, starting a stirrer, introducing cooling water into a jacket, adding 3-9% of polyphosphate, 3-6% of chelating agent and 20-25% of sodium hydroxide, stirring and dissolving completely at a temperature lower than 40 ℃, then sequentially adding 5-10% of sodium carbonate, 1-3% of sodium dodecyl benzene sulfonate, 1-3% of small molecular alcohol and 1-3% of alcohol amine, stirring and dissolving completely, and thus obtaining the sodium dodecyl benzene sulfonate.
The invention also provides the application of the membrane cleaning agent, which is used for cleaning the membrane after filtering the garbage percolate. Further, the membrane comprises at least one of a nanofiltration membrane, a microfiltration membrane, a roll type reverse osmosis membrane, a disc tube type reverse osmosis membrane or a super reverse osmosis membrane.
Wherein, in the using method of the membrane cleaning agent, the mass concentration of the membrane cleaning agent is 2-5% when in use.
The invention has the beneficial effects that:
The membrane cleaning agent disclosed by the invention has the advantages that the removal effect on sulfur pollutants is improved, and organic matter blockage and microorganism blockage can be effectively cleaned; the cleaning agent disclosed by the invention adopts the anionic surfactant and the nonionic surfactant in a matching way, so that the synergistic effect and the salt resistance of the surfactants are improved, and the good emulsification and dispersion effects of the surfactants are still kept under the condition of high salt content. The membrane cleaning agent disclosed by the invention is suitable for nanofiltration, microfiltration, RO, DTRO and SRO systems, especially for a high-concentration wastewater membrane concentration treatment process, can effectively remove sulfur-containing organic-inorganic composite pollutants, is convenient to use, and can meet the use requirements of the cleaning equipment conditions of common membrane systems.
The chelating agent is added into the cleaning agent, and the cleaning agent mainly plays a role in complexing in cleaning and complexing with cations in pollutants to prevent the cations from forming insoluble compounds with organic matters, so that the cleaning agent plays a role in cleaning, stripping and dispersing. The chelating agent is preferably at least one of EDTA-2Na and EDTA-4Na in order to improve the chelating effect and reduce the cost, and various chelating agents can be used, such as ethylenediaminetetraacetic acid (EDTA), nitrilotriacetic acid (NTA), diethylenetriaminepentaacetic acid (DTPA), and hydroxyethylethanamine triacetic acid (HEDTA).
In the membrane cleaning agent, the small molecular alcohol is at least one of ethanol or isopropanol. The small molecular alcohol mainly refers to alcohol with the carbon atom number less than 4, and after the carbon atom number exceeds 4, the alcohol has a relatively strong peculiar smell and is not suitable for being used as a film cleaning agent. In the small molecular alcohol, methanol is toxic and has a lower boiling point, the effect is not good, the boiling points of ethanol and isopropanol are moderate, no obvious toxicity exists, and the cost performance is high.
In the film cleaning agent, for better emulsification and dispersion, the alcohol amine is at least one of monoethanolamine, diethanolamine or triethanolamine; the alcohol amine has low toxicity, no carcinogenicity, no obvious peculiar smell and safe use.
In the membrane cleaning agent, in order to improve the decontamination, dispersion and emulsification capacity of the membrane cleaning agent, the polyphosphate is at least one of sodium tripolyphosphate, sodium hexametaphosphate or potassium pyrophosphate.
The invention also provides a preparation method of the membrane cleaning agent, which comprises the following steps:
Weighing 55-60% of deionized water in a reaction kettle, starting a stirrer, introducing cooling water into a jacket, adding 3-9% of polyphosphate, 3-6% of chelating agent and 20-25% of sodium hydroxide, stirring and dissolving completely at a temperature lower than 40 ℃, then sequentially adding 5-10% of sodium carbonate, 1-3% of sodium dodecyl benzene sulfonate, 1-3% of small molecular alcohol and 1-3% of alcohol amine, stirring and dissolving completely, and preparing to obtain the sodium dodecyl benzene sulfonate-containing aqueous solution
At present, no special cleaning agent specially used for cleaning sulfur pollution in a landfill leachate treatment system exists in the market. The existing membrane cleaning agent mainly considers the pollution blockage caused by cleaning organic matters or inorganic sediments (carbonate, metal oxide, sulfate) and the like, the organic matter pollution is mainly to strip the organic matters from a system and carry the organic matters out along with water flow, and the action mechanism is infiltration, stripping and dispersion; the inorganic pollution is mainly removed by an acid washing method.
However, sulfur pollution is different from organic pollution and inorganic pollution, and good cleaning effect cannot be achieved by adopting the two cleaning agents. When the membrane cleaning agent specially aiming at sulfur pollution is designed, the components (EDTA, polyphosphate, sodium dodecyl benzene sulfonate and the like) with good functions of infiltration, stripping and dispersion are selected, and the membrane cleaning agent has the effect of an alkaline cleaning agent and can clean organic pollution in a membrane. Meanwhile, the invention also particularly adds components such as alcohol ammonia, and the like, so that the speed of dissolving sulfur pollutants can be effectively improved, and the pollutants can be conveniently taken away from the system.
The membrane which is suitable for being cleaned by the cleaning agent is the membrane after filtering the garbage percolate, and is particularly suitable for cleaning a nanofiltration membrane, a microfiltration membrane, a roll type reverse osmosis membrane, a disc tube type reverse osmosis membrane or a super reverse osmosis membrane in a garbage percolate system.
the following examples are intended to illustrate specific embodiments of the present invention without limiting the scope of the invention to the examples.
Example 1
Weighing 55% of deionized water in a reaction kettle, starting a stirring device, starting jacket cooling water, firstly adding 4% of EDTA-4Na, 6% of sodium tripolyphosphate and 20% of sodium hydroxide, sequentially adding 5% of sodium carbonate, 3% of sodium dodecyl benzene sulfonate, 2% of ethanol and 5% of triethanolamine after completely dissolving at a temperature lower than 40 ℃, and stirring and completely dissolving to obtain a finished product.
Example 2
Weighing 60% of deionized water in a reaction kettle, starting a stirring device, starting jacket cooling water, firstly adding 5% of EDTA-2Na, 5% of sodium hexametaphosphate and 15% of sodium hydroxide, sequentially adding 10% of sodium carbonate, 1% of sodium dodecyl benzene sulfonate, 1% of isopropanol and 3% of diethanolamine after completely dissolving and the temperature is lower than 40 ℃, and stirring and dissolving completely to obtain a finished product.
Test example 1
The membrane cleaning experiment was carried out on the membrane treating agents prepared in examples 1 and 2, and the specific procedures were as follows:
The dissolution experiment was performed with the contaminants retrieved from the membrane elements of a landfill leachate project, formulated with desalted water, and the concentration of the contaminants was made to be 0.2%. The concentration of the used cleaning agent is 3% of the total weight of the cleaning water, and the specific experimental method and the phenomenon are as follows:
In order to enable the experiment to be closer to the actual operation working condition on site, the film taken back on site is selected for dissection, the pollutants attached to the unit area are sampled, dried, weighed, calculated and counted to obtain the total weight of the pollutants, and then the total weight of the pollutants is removed from the volume of the cleaning solution in the cleaning water tank to obtain 0.2% of pollutants.
the method for investigating the dissolving effect of the pollutants comprises the following steps: weighing 0.2 g of pollutants by using 100g of cleaning solution, filtering by using filter paper with constant weight after the dissolution experiment is finished, washing insoluble substances by using 100ml of desalted water for three times, drying the undissolved parts and the filter paper, weighing, and deducting the constant weight of the filter paper to obtain the weight of the insoluble substances, thereby calculating the dissolution rate.
The table represents different film cleaning agent use effect tables
| Serial number | Name of medicament | Concentration of contaminants | Dissolution temperature | Dissolution time | Dissolution rate |
| 1 | blank sample | 0.2% | 35-40℃ | 10min | 2.1% |
| 2 | Conventional pickling agent | 0.2% | 35-40℃ | 10min | 4.6% |
| 3 | Conventional alkaline detergent | 0.2% | 35-40℃ | 10min | 13.4% |
| 4 | Example 1 | 0.2% | 35-40℃ | 10min | 88.5% |
| 5 | Example 2 | 0.2% | 35-40℃ | 10min | 72.9% |
Test example 2
The membrane cleaning agent is taken for verification, and the specific steps are as follows:
(1) and after the water washing of the online cleaning equipment is finished, desalted water is supplemented, a cleaning cycle is established, and the existence of leakage, the running condition of the equipment and the like is checked. And (3) after the inspection is finished, the dispensing work is started, desalted water for cleaning is heated to 35-40 ℃, the opening of the return valve of the cleaning pump is opened to the maximum, the cleaning agent is added into the cleaning water tank, the preparation concentration is 3%, the mixture is uniformly mixed, the pH value is sampled and tested, after the pH value reaches a set range (11-13), the opening of the return valve of the cleaning pump is closed, the cleaning solution enters the membrane element, and the water inlet pressure is adjusted to the required pressure condition.
(2) The washing process the pH, temperature of the washing reflux was tested every 10 minutes and the membrane flux changes were recorded. Controlling the temperature at 35-40 ℃, controlling the pH at 11-13, circularly soaking for 10 minutes in 50 minutes, carrying out soaking overnight in 6-8 periods (the total alkali washing time is about 6-8 hours), circularly running for 30 minutes the next day, finishing alkali washing, and carrying out water washing.
(3) If the color of the cleaning liquid is darker or dirtier in the cleaning process, a part of the cleaning liquid in the cleaning water tank can be drained, and the desalted water and the cleaning agent can be supplemented in time.
(4) When the cleaning flux, pH, chroma and the like are basically stable, the cleaning end point can be regarded as the cleaning end point, the cleaning liquid is drained, and the cleaning liquid is washed by desalted water until the pH value is neutral, and the washing can be finished.
(5) After the cleaning is finished, the system can be normally put into operation or acid cleaning can be carried out subsequently, but before the acid cleaning, the system must be thoroughly washed, and unnecessary damage to the membrane element caused by acid-base neutralization reaction is avoided.
The garbage leachate treatment system is cleaned according to the method: reverse osmosis design capacity of 13m3Per, treatment Capacity before cleaning 10m3H, water yield of 8m3H; after cleaning, the processing capacity was 12.5m3H, water yield of 10m3H is used as the reference value. The water yield after cleaning is increased by 2m3The lifting amplitude is 25%, and the expected cleaning effect is achieved.
Cleaning a landfill leachate treatment system II according to the method: the reverse osmosis design treatment capacity is 15m3Per, treatment capacity before cleaning of 12m3H, water yield of 8m3h; after cleaning, the processing capacity was 14m3h, water yield of 11m3H is used as the reference value. The water yield is increased by 3m after cleaning3The lifting amplitude is 37.5 percent, and the expected cleaning effect is achieved.
Claims (8)
1. The membrane cleaning agent is characterized by comprising the following components: according to the mass fraction, 55-60% of deionized water, 3-9% of polyphosphate, 3-6% of chelating agent, 20-25% of sodium hydroxide, 5-10% of sodium carbonate, 1-3% of sodium dodecyl benzene sulfonate, 1-3% of small molecular alcohol and 1-3% of alcohol amine.
2. The film cleaning agent according to claim 1, wherein: the chelating agent is at least one of EDTA-2Na or EDTA-4 Na.
3. The film cleaning agent according to claim 1, wherein: the small molecular alcohol is at least one of ethanol or isopropanol.
4. The film cleaning agent according to claim 1, wherein: the alcohol amine is at least one of monoethanolamine, diethanolamine or triethanolamine.
5. The film cleaning agent according to claim 1, wherein: the polyphosphate is at least one of sodium tripolyphosphate, sodium hexametaphosphate or potassium pyrophosphate.
6. The method for preparing a membrane cleaning agent according to claim 1, comprising the steps of:
Weighing 55-60% of deionized water in a reaction kettle, starting a stirrer, introducing cooling water into a jacket, adding 3-9% of polyphosphate, 3-6% of chelating agent and 20-25% of sodium hydroxide, stirring and dissolving completely at a temperature lower than 40 ℃, then sequentially adding 5-10% of sodium carbonate, 1-3% of sodium dodecyl benzene sulfonate, 1-3% of small molecular alcohol and 1-3% of alcohol amine, stirring and dissolving completely, and thus obtaining the sodium dodecyl benzene sulfonate.
7. Use of the membrane cleaning agent according to claim 1, wherein: used for cleaning the membrane after filtering the landfill leachate.
8. Use of a membrane cleaning agent according to claim 6, characterized in that: the membrane comprises at least one of a nanofiltration membrane, a microfiltration membrane, a roll type reverse osmosis membrane, a disc tube type reverse osmosis membrane or a super reverse osmosis membrane.
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| CN201910909787.6A CN110577859A (en) | 2019-09-25 | 2019-09-25 | Cleaning agent for DTRO (draw texturing yarn) membrane and preparation and use methods thereof |
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| CN201910909787.6A CN110577859A (en) | 2019-09-25 | 2019-09-25 | Cleaning agent for DTRO (draw texturing yarn) membrane and preparation and use methods thereof |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114621833A (en) * | 2022-03-08 | 2022-06-14 | 河北源清环保科技有限公司 | Liquid phosphorus-free alkaline membrane cleaning agent and preparation method thereof |
| CN116272389A (en) * | 2022-12-26 | 2023-06-23 | 杭州尚善若水环保科技有限公司 | Composite efficient membrane cleaning agent and preparation method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108939926A (en) * | 2018-09-03 | 2018-12-07 | 成都水医生化学品科技有限责任公司 | Cleaning agents of membrane and its preparation and application |
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- 2019-09-25 CN CN201910909787.6A patent/CN110577859A/en active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108939926A (en) * | 2018-09-03 | 2018-12-07 | 成都水医生化学品科技有限责任公司 | Cleaning agents of membrane and its preparation and application |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114621833A (en) * | 2022-03-08 | 2022-06-14 | 河北源清环保科技有限公司 | Liquid phosphorus-free alkaline membrane cleaning agent and preparation method thereof |
| CN116272389A (en) * | 2022-12-26 | 2023-06-23 | 杭州尚善若水环保科技有限公司 | Composite efficient membrane cleaning agent and preparation method thereof |
| CN116272389B (en) * | 2022-12-26 | 2023-09-08 | 杭州尚善若水环保科技有限公司 | Composite efficient membrane cleaning agent and preparation method thereof |
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