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NF System


Nanofiltration membrane refers to a membrane with a "nanoscale pore size", which is interposed between the ultrafiltration membrane and the reverse osmosis membrane and has a certain rejection rate for the inorganic salt, ranging from 100 to 1000 daltons The Nanofiltration membrane is the main feature of the divalent ions, functional sugars, small molecules, peptides and other substances interception performance is higher than 98%, and for some monovalent ions, small molecules acid, alcohol, etc. 30-80% The separation performance of the solvent is often applied to the classification of solutes, the elution of low molecular substances in the solution and the adjustment of the ionic components, the separation of the solvent system and other substances, the purification and concentration process, the nanofiltration separation technology is also often Used to replace the traditional process of freeze-drying, film evaporation, ion exchange desalination, resin process concentration, and other processes. In general, nanofiltration technology has the following characteristics:

    1), the process at room temperature and low pressure, low energy consumption, no heating, no thermal effect and phase change, without adding any other material to achieve separation, enrichment, purification and grading purposes. It is particularly suitable for:

    2), suitable for the separation and concentration of heat-sensitive substances, in particular, need to maintain the original product odor, taste, shape, color and the physical and chemical properties of nutrients and the separation and concentration of food and chemical products is of great significance.

    3), can be very thin solute concentration recovery, constant volume constant concentration of desalination purification.

    4), nanofiltration device structure is simple, small footprint, less ancillary equipment required, easy installation, low cost, easy to insert the existing production process system, expand the capacity and increase the components easy; easy to clean, can be repeated for a long time

    5), reverse osmosis membrane packing density, low investment cost, simple operation, short start-up time, easy maintenance and repair, easy automatic control, low system energy consumption, short production cycle, easy operation and maintenance, low running cost;

    6), based on user needs, to determine the best system recovery and system desalination rate, resulting in high concentration or high purity of the material;

    7), the core membrane components using world famous brands, quality assurance, the appearance of the use of sanitary stainless steel, fully enclosed pipeline operation, on-site safety and health, to meet the GMP (or FDA) specification requirements;

Nanofu is a new type of separation technology developed on the basis of reverse osmosis. Although the history of market development is only 10 years old, it has been applied in the field of purification, concentration and concentration of water softening, antibiotics, polysaccharides and dyes, Can replace or partially replace the reverse osmosis membrane, bio-pharmaceutical and fine chemical industry to become an important energy efficient unit operation. A precursor of trihalomethanes (THM) in water can be removed with a nanofiltration membrane to prevent the formation of THM in water. In the food industry, has been used for whey enrichment, can be desalted, in addition to lactose and protein concentration at the same time, and has reached the level of industrialization. Can also be used for food decolorization, ammonia acid separation, peptide purification and concentration. In the wastewater treatment, with the nanofiltration membrane on the wood pulp extraction stage of the formation of waste liquid decolorization, decolorization rate of 98% or more. The nanosulfate can also be used to separate the metal sulphates and nitrates from the acidic solution, with a rejection rate of up to 95% for nickel sulfate. The application of nanofiltration equipment is also very early in the process of continuous accumulation and innovation, we have a lot of successful engineering experience, and these experiences continue to promote the application to the new production process, which can be applied The following areas

1). Biomedical separation, purification and purification;

    2). Electroplating, dye industry desalination concentrated recovery;

    3). Environmental protection industry and other areas of water treatment standards discharge or reuse;

    4). Food industry concentrated (fructose, oligosaccharides, fruit juice, etc.);

    5). Desalination, concentration (antibiotics, amino acids, organic acids, etc.) of biological fermentation broth;

    6). Waste acid, waste alkali recovery (from the column of column washing wastewater, chemical industry lye, printing industry lye, etc.).

At present, the most commonly used nanofiltration membrane is a plate structure, a roll structure and a tubular structure, in which the roll type nanofiltration membrane is the most common form and can be applied to the separation, purification and concentration of various difficult materials. The nanofiltration membrane is composed of a high-strength support layer, a transition layer and a film layer which are asymmetrically distributed to form a film roll, and the plurality of membrane pockets are wound onto the same center tube, and the liquid material Through the membrane into the membrane pocket after the flow into the product liquid center tube, in order to facilitate the product liquid in the membrane bag pressure flow, in the envelope-like membrane bag is covered with a layer of liquid material flow guide high-strength fabric support layer; So that the liquid evenly through the membrane surface and to the liquid flow to disturb, in the membrane bag and the membrane between the liquid channel to the folder with a network layer, with a strong pressure, working pressure up to 5Mpa, using Polyether sulfone polymer material, strong anti-pollution, can be a long time and efficient continuous operation, roll-type nanofiltration membrane core tube as shown below:

Nano filter use a wide range of production scale and quality requirements vary, so the device process is also different. The nanofiltration system can be connected in series and in parallel by single or multiple nanofiltration components and can be assembled into a variety of different applications. According to the purpose of different use, nanofiltration system can be divided into concentrated and separation type. According to the scale of production and product quality requirements, but also can be divided into continuous, intermittent two, and can be different levels and sections of the configuration. A complete reverse osmosis device, generally including the preparation of liquid, reverse osmosis membrane components, valves, piping and electrical control of three parts.


Membrane material


Membrane model


Filtration pressure


Filtration temperature


Filtration flux


monitor rate












0.6t / h


1.5 / 1.2 / 1.5



1.5t / h


3.5 / 1.3 / 1.6



5t / h


2.5 / 1.3 / 1.6



10t / h


3.5 / 1.5 / 1.8



15t / h


3.5 / 1.7 / 1.8



20t / h


4.5 / 1.8 / 2.2



25t / h


5.5 / 2.2 / 2.5



30t / h


5.5 / 2.5 / 2.8

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Ge Yi (Shanghai) Environmental Technology Co., Ltd.

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