Industrial Nanofiltration Membrane Elements

(0 reviews)

Get Price

(566) Views

(0) Contacts

Nanofiltration (NF) - A Pressure-driven Membrane Separation Process

Contact Company

Nanjing Junxin Environmental Technology Co., Ltd

Jiangsu, China

(1963) Views

(7) Contacts

Small molecule organic compounds like glucose and sucrose, as well as inorganic salts, are separated from solvents using a process called nanofiltration (NF). Nanofiltration is a developing area of membrane separation technology, commonly referred to as low-pressure reverse osmosis. Some inorganic salts and some solvents can pass across the membrane to achieve separation, which is between reverse osmosis and ultrafiltration.

The technical basis of the new membrane separation technology known as nanofiltration separation is comparable to mechanical sieving. The nanofiltration membrane, however, has a charge. This is a crucial factor in why it still performs well at very low pressures for desalination, and why the membrane's molecular weight cutoff of several hundred can also remove inorganic salts.

Principle of NF
In between reverse osmosis and ultrafiltration, there is a pressure-driven membrane separation method called nanofiltration. Nanofiltration membranes have pores that are only a few nanometers wide. Compared to other pressure-driven membrane separation techniques, it seems slow. Its development can be attributed to J.E. Cadotte's NS-300 membrane research in the late 1970s. Following that, nanofiltration quickly advanced, and the membrane stacker entered into general use in the middle of the 1980s. Reverse osmosis membranes like CA, CTA, aramid composite, and sulfonated polyethersulfone membranes are the main source of inspiration for nanofiltration membranes.
Small molecule organic compounds like glucose and sucrose, as well as inorganic salts, are separated from solvents using a process called nanofiltration (NF). Nanofiltration is a developing area of membrane separation technology, commonly referred to as low-pressure reverse osmosis. Some inorganic salts and some solvents can pass across the membrane to achieve separation, which is between reverse osmosis and ultrafiltration.
Small amounts of dissolved salts and water molecules pass through a selective semi-permeable membrane during nanofiltration, while other dissolved and colloid organic matter, bacteria, microorganisms, and other impurities are discharged with concentrated water. It can be used in a variety of process water stations for desalination, softening, and refinement of biochemical products, specialty foods, colors, etc.

Applications of Nanofiltration (NF)

The use of nanofiltration separation in the electronics, food, and pharmaceutical industries is increasing. Examples include the preparation of ultrapure water, high concentrations of fruit juice, peptide and amino acid separation, antibiotic concentration and purification, and whey protein concentration. while actually separating, such while coupling. The nanofiltration method, when compared to ultrafiltration or reverse osmosis, retains monovalent ions and organic compounds with molecular weights below 200 poorly, while removing organic compounds with molecular weights between 200 and 500 more thoroughly. The separation, classification, and concentration of substances with a relative molecular mass in the 100-level (such as dyes, antibiotics, peptides, polysaccharides, and other chemical and biological engineering products classification. and concentration), decolorization, and deodorization, among other processes, are the primary uses for the nanofiltration process based on this characteristic.

It is mostly used to remove soluble organics, synthetic detergents, odors, chroma, pesticides, and evaporation residues from drinking water, as well as hardness components such Ca and Mg ions, trihalomethane intermediates, and odor.

People aim to attain the recovery of valuable compounds while treating wastewater as environmental awareness of resource conservation and comprehensive resource use continue to rise. For instance, oligosaccharides and a little quantity of salt are included in around 1% of the effluent from soybean whey. 2% to 2.5% of six-carbon sugar and five-carbon sugar are found in the calcium sulfite waste liquid used to make chemical fiber pulp and paper pulp using the sulfate technique. A trace quantity of salt is also present in waste molasses from the sugar industry. NF separation is a green water treatment technology that, in some cases, can take the place of expensive and time-consuming procedures used in conventional sewage treatment.

In municipal sewage, electroplating wastewater, printing and dyeing wastewater, material separation, drug concentration, electrophoretic coating, and other related fields, UF (ultrafiltration), NF (nanofiltration), and RO (reverse osmosis) models cover roll, flat, and other membrane elements.

Benefits of Industrial Nanofiltration Membrane Elements

Resilience to high temperatures, acids, and alkalis.
widely utilized in a variety of sectors, including those that treat wastewater, produce food and beverages, use reclaimed water, and treat pharmaceuticals.
The size and form of the substance's molecules, which are typically in the range of 100-1000, can have an impact on whether or not it is rejected.
It has a higher rejection rate for divalent or polyvalent salts, typically exceeding 90%, and a lower rejection rate for monovalent salts like sodium chloride due to its selective separation properties.
Membrane components used in homes.
Membrane components used in homes Membrane components used in homes.
has an abundant water flux.
possesses high mechanical stability.
Water quality is excellent, and there is an anti-pollution wall. Pore size distribution is uniform.
Under various pressure conditions, high-pressure resistance can be applied.
The production of high-quality water is ensured by high-performance membrane components.

Technical Characteristics of Industrial Nanofiltration Membrane Elements

It can block organic molecules with a molecular weight more than 100 and multivalent ions while allowing monovalent ions and tiny molecules.
Ion permeation has several advantages over other sewage treatment methods, including the ability to operate in harsh conditions like high temperatures, acids, and alkalis, as well as resistance to pollution.
The device also has low operating pressure, a high membrane flux, and a low operating cost.
The NF membrane is mostly utilized in the treatment of wastewater that contains solvents because it is highly successful at removing color, hardness, and odd tastes from water.
Sugar, pulp, and paper have all used NF membrane with great success thanks to its unique separating capabilities.
Wastewater treatment for businesses including electroplating, machining, and catalyst recovery for chemical reactions.