What is nanofiltration technology? What is the difference between nanofiltration and ultrafiltration

<> nanofiltration is a membrane separation technology between ultrafiltration and reverse osmosis, and the water purifiers on the market are mainly divided into ultrafiltration water purification, nanofiltration water purification and reverse osmosis water purification. Water purification capacity ultrafiltration is the lowest, reverse osmosis is the strongest, but nanofiltration is the healthiest permeation method for the human body. The ultrafiltration membrane is relatively backward, which is equivalent to drinking the good and bad things, and absorbing the beneficial and harmful ones.

The filtration pore size of ultrafiltration membrane can remove bacteria, colloids, organic matter, and viruses in water, but there is no way to remove scale and heavy metals. Reverse osmosis membrane is the mainstream technology of water purifiers on the market, the filtration pore size is microns, which can remove all impurities in the water, and the effluent is pure water. The second is a waste of electricity, which requires a booster pump to work; The third is that there is no nutrition, the water is filtered too pure, and it has become weakly acidic, and long-term drinking is not good for the human body. In between, you can think of a high-end restaurant salad with clean, fresh, organic, but raw vegetables are the best way to ensure their nutrient content.

This is like nanofiltration, which can retain substances larger than microns. Ultrafiltration membranes allow small molecule substances and dissolved solids (inorganic salts) to pass through, while retaining colloids, proteins, microorganisms and macromolecular organic compounds, retaining beneficial minerals and trace elements in water, compared with ultrafiltration and reverse osmosis, it has the characteristics of power saving, water saving, health and long life. I am currently using a nanofiltration water purifier, and I use the brand of Bishuiyuan.

Nanofiltration is a pressure-driven membrane separation process between reverse osmosis and ultrafiltration, with nanofiltration membranes ranging in pore size of a few nanometers. It occurs later than other pressure-driven membrane separation processes. Its appearance can be traced back to the late 70's with the research of Cadotte's NS-3 0 0 membrane, after which nanofiltration developed rapidly and membrane stackers were commercialized in the mid-80's.

Nanofiltration membranes are mostly derived from reverse osmosis membranes, such as CA, CTA membranes, aramid composite membranes and sulfonated polyethersulfone membranes.

Nanofiltration (NF) is used to separate substances with small relative molecular masses, such as inorganic salts or small organic molecules such as glucose and sucrose, from solvents. Nanofiltration, also known as low-pressure reverse osmosis, is an emerging field of membrane separation technology, and its separation performance is between reverse osmosis and ultrafiltration, allowing some inorganic salts and some solvents to pass through the membrane to achieve the separation effect. (from Encyclopedia).

First, the membrane pore size is different.

1. Nanofiltration: The pore size range of nanofiltration membrane is about a few nanometers.

2. Ultrafiltration: for the purpose of separating large molecules from small molecules, the membrane pore size is between 20 and 1000A°.

Second, the characteristics are different.

1. Nanofiltration: Nanofiltration membrane has excellent properties such as thermal stability, acid resistance, alkali resistance and solvent resistance, and plays an immeasurable role in the valuable substances of wastewater.

2. Ultrafiltration: Ultrafiltration components should be handled with care, and pay attention to protection, because ultrafiltration components are precision equipment, so be careful when using and installing, and handle them with care, and not to be broken. If the component is out of use, it should be rinsed with clean water first, and then disinfected and sterilized with formaldehyde aqueous solution, and sealed.

For example, in winter, the module should also be frost-proofed, otherwise the module may be scrapped.

Third, the application is different.

1. Nanofiltration: Nanofiltration is mainly used in the purification of drinking water and industrial water, wastewater purification and treatment, and the concentration of valuable components in process fluids.

2. Ultrafiltration: Ultrafiltration technology has become an indispensable and powerful tool in the fields of pharmaceutical industry, food industry, electronics industry and environmental protection.

Ultrafiltration is a pressurized membrane separation technology, that is, under a certain pressure, the small molecule solute and solvent pass through a special membrane with a certain pore size, so that the macromolecular solute can not be penetrated and remains on one side of the membrane, so that the macromolecular substances are partially purified.

The advantages of ultrafiltration technology are easy to operate, low cost, no need to add any chemical reagents, and the disadvantages are more obvious.

Nanofiltration is a new type of nano-scale separation membrane, which is a kind of filter membrane between ultrafiltration membrane and reverse osmosis membrane, which represents the latest achievements in the field of membrane separation, and is the first choice for drinking water treatment methods in developed countries such as the United States, Japan, France and other countries.

They have different filter pore sizes.

Ultrafiltration membrane: can be retained.

microns between macromolecular substances and proteins. Ultrafiltration membranes allow the passage of small molecule substances and dissolved solids (inorganic salts), while colloids, proteins, microorganisms and macromolecular organic matter will be intercepted, and the cleavage molecular weight range used to represent the pore size of ultrafiltration membranes is generally between 1000-500000. Ultrafiltration membranes typically operate at pressures of 1-7 bar.

Nanofiltration membranes: substances that can retain nanometers (micrometers). The operating range of nanofiltration membrane is between ultrafiltration and reverse osmosis, the molecular weight of the retained organic matter is about 200-800MW, the ability to intercept dissolved salts is between 20% and 98%, and the removal rate of soluble monovalent ions is lower than that of ** ions.

The operating pressure of nanofiltration membranes is average.

Summary. Hello dear, it is a pleasure to answer <> for you

Nanofiltration water refers to the water produced with nanofiltration membrane as the core technology, and the pore size of the nanofiltration membrane is nanofiltration grade, which is between reverse osmosis (RO) and ultrafiltration membrane. Therefore, the water treatment technology that uses this membrane is called nanofiltration.

Nanofiltration membranes are capable of retaining substances with molecular weights of several hundred, with a rejection rate of 50% to 70% for NACI and up to 90% for some low-molecular-weight organic compounds. Because nanofiltration has a high efficiency in removing natural organic matter in water and can properly retain low molecular weight inorganic components, it has developed rapidly in water purification treatment.

Mineral water is not the same as nanofiltration water, but both are drinkable.

What is nanofiltration membrane technology? What kind of water is the water filtered by a nanofiltration membrane.

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Is mineral water the same as nanofiltration water?

What about people. Hello dear, it is a pleasure to answer <> for you

Nanofiltration water refers to the water produced with nanofiltration membrane as the core technology, and the pore size of the nanofiltration membrane is nanofiltration grade, which is between reverse osmosis (RO) and ultrafiltration membrane. Therefore, the water treatment technology that uses this membrane is called nanofiltration.

Nanofiltration membranes are capable of retaining substances with molecular weights of several hundred, with a rejection rate of 50% to 70% for NACI and up to 90% for some low-molecular-weight organic compounds. Because nanofiltration has a high efficiency in removing natural organic matter in water and can properly retain low molecular weight inorganic components, it has developed rapidly in water purification treatment.

Mineral water is not the same as nanofiltration water, but both are drinkable.

Is it better to have pure water or nanofiltration water?

What about people. Hello, pure water is equivalent to nanofiltration water, there is no good or bad.

Purified water has no minerals, while nanofiltration water retains minerals.

Hello, the rejection rate of some low molecular weight organic compounds can reach 90%. Due to the high efficiency of nanofiltration in removing natural organic matter in water, and the ability to properly retain low molecular weight inorganic components, there are not many minerals in fact, and the retention of minerals in nanofiltration water is only a propaganda method. If you want water with a lot of minerals, you can drink mineral water directly.

So what is the machine that can make mineral water?

Mineral water equipment uses ultrafiltration devices, which are usually used to produce mineral water and mountain spring water, which is a process that uses pressure as the driving force to separate impurities in the liquid by using different pore sizes of ultrafiltration membranes.

Nanofiltration membrane is a membrane separation technology that uses the pressure difference as the driving force and is between reverse osmosis and ultrafiltration, and the particle size of the trapped water is nano-scale.

The pore size is above 1 nm, generally 1-2 nm (1 nanometer (nm) = micrometer (um)). It is a functional semi-permeable membrane that allows solvent molecules or certain low molecular weight solutes or low-valent ions to pass through. It is a special and promising separation membrane species, it is named because it can intercept the size of the substance about nanometers, it retains the molecular weight of organic matter of about 150 500, the ability to intercept dissolved salts is between 2 98%, and the desalting of monovalent anionic salt solution is lower than that of ** anionic salt solution.

Nanofiltration is generally used to remove organic matter and pigments in surface water, hardness and radium in groundwater, and partially remove dissolved salts, and extract and concentrate useful substances in food and pharmaceutical production.

Nanofiltration (NF) is a membrane separation technology between ultrafiltration and reverse osmosis, with a molecular weight cut-off in the range of 80-1000 and a pore size of a few nanometers, so it is called nanofiltration. Based on the superior characteristics of nanofiltration separation technology, it has shown broad application prospects in many fields such as pharmaceutical, biochemical, and food industry. Features of the company's nanofiltration membrane system:

1. The system has high filtration accuracy, stable treatment effect, simple maintenance, beautiful appearance and precise manufacturing;

2. The system parameters are accurately controlled, the automatic control design is perfect, and it can be fully controlled according to customer requirements;

3. Rich experience in system design, and the design capabilities cover from laboratory equipment of tens of liters per hour to large-scale industrial systems of hundreds of tons per hour.

4. The system process design verification is strict, and the design is rigorous and standardized.

Membrane element science: What are the performance advantages of nanofiltration membranes?

This may be easier to understand.

Nanofiltration membranes can remove organic matter, three-way substances, disinfection by-products, volatile organic compounds, and the application of direct drinking water through pipelines.

One reason why many people choose nanofiltration is the ability to trap particles between microns. It allows macromolecules and dissolved solids (inorganic salts) to pass through, but retains suspended solids, bacteria, and large molecular weight colloids. The operating pressure of nanofiltration membrane is lower than that of reverse osmosis, but it is more expensive than reverse osmosis, so the general household water purifier is mainly ultrafiltration and reverse osmosis water dispenser.

In the industry, to see the specific requirements of water, if you want to meet the requirements of pure water, you must use reverse osmosis.

Nanofiltration: abbreviated as NF, refers to the filtration accuracy of the membrane is 1 nanometer, under a certain pressure, water molecules and a part of the monovalent potassium ions and sodium ions that are beneficial to the human body can pass through the nanofiltration membrane, so as to separate water from harmful impurities such as scale, heavy metals, and antibiotics. Mineral water is mineral water that retains a portion of the mineral ions that are beneficial to the human body.

The difference between ultrafiltration membranes and nanofiltration membranesUltrafiltration membranes

Ultrafiltration (UF).

Ultrafiltration can intercept particles and impurities between microns, ultrafiltration membranes allow small molecule substances and dissolved solids (inorganic salts) to pass through, but will effectively block colloids, proteins, microorganisms and macromolecular organic matter, the cleavage molecular weight used to characterize ultrafiltration membranes is generally between 1,000 100,000, and the operating pressure on both sides of the reverse osmosis membrane is generally .

Nanofiltration membranes

Nanofiltration (NF).

Nanofiltration is a special and promising separation membrane species, it is named because it can intercept the size of the substance about 1 nanometer (micron), the operating interval of nanofiltration is between ultrafiltration and reverse osmosis, it intercepts the molecular weight of organic matter is about 200 400, the ability to retain dissolved salts is between 20 98%, and the removal rate of monovalent anionic salt solution is lower than that of ** anionic salt solution, such as sodium chloride and calcium chloride The removal rate is 20 80%, and the removal rate of magnesium sulfate and sodium sulfate is 90 98%. Nanofiltration membranes are generally used to remove organic matter and color of surface water, remove the hardness and radioactive radium of well water, partially remove dissolved salts, concentrate food and separate useful substances in pharmaceuticals, etc., and the operating pressure of nanofiltration membrane is generally .

Nanofiltration membranes

The pore size of the filter is different, and the pore size from large to small is microfiltration, ultrafiltration, nanofiltration, reverse osmosis, and nanofiltration is smaller than the pore size of microfiltration, that is, the filtration accuracy is a little higher, and reverse osmosis is currently the highest filtration accuracy.

Pure water and ultrafiltration are recommended, and nanofiltration is something that some miscellaneous brands can fool customers.

Mr. Suzhou Water Environmental Protection Zhang Kun Thank you for your attention, and send me a private message if you have any questions.

Nanofiltration works on the principle of bai.

Membrane separation is based on the use of membranes to the components of the DU mixture.

Zhi selects the difference in osmotic performance, and uses the external energy or chemical potential difference capacity as the driving force to separate, classify, purify and enrich two-component or multi-component mixed gases or liquids. The membrane process in which the membrane pore size is at the nanometer level and is suitable for separating dissolved components with a molecular weight of 100 1000 and a molecular size of about 1 nm is called nanofiltration (NF). The transmembrane differential pressure required for NF membrane separation is generally MPa, which is lower than the differential pressure required to achieve the same permeation energy with a reverse osmosis membrane.

Depending on the operating pressure and separation boundaries, NF can be qualitatively placed between reverse osmosis and ultrafiltration, and NF is sometimes referred to as it"Low-pressure reverse osmosis"or"Loose reverse osmosis"。70s of the 20th century J e.

Cadotte's study of NS-300 membranes is the beginning of the study of NF membranes. At that time, it was used by the Israeli desalination company"Mixed filtration"to denote the process of membrane separation between reverse osmosis and ultrafiltration, and later American companies called this membrane technology nanofiltration, which has been used to this day. After that, NF developed rapidly, and membrane modules were commercialized in the mid-80s.

At present, NF has become one of the research hotspots in the field of membrane separation in the world.