Ultrafiltration (UF) is a membrane separation technology which can purify and separate the solution. The ultrafiltration membrane system is a solution separation device which takes the ultrafiltration membrane as the filtration medium and the pressure difference on both sides of the membrane as the driving force. The ultrafiltration membrane only allows the solvent (such as water molecules), inorganic salts and small molecular organics in the solution to pass through, and intercepts the suspension, colloid, protein, microorganism and other macromolecular substances in the solution, so as to achieve the purpose of purification or separation.
Ultrafiltration is a membrane separation process with screening as the separation principle and pressure as the driving force. The filtration accuracy is in the range of 0.005-0.01 μ m, which can effectively remove particles, colloids, bacteria, heat sources and high molecular organic substances in water. It can be widely used in the separation, concentration and purification of substances. There is no phase transformation in the ultrafiltration process, and the operation at room temperature is particularly suitable for the separation of heat sensitive substances. It has good temperature, acid and alkali resistance and oxidation resistance. It can be used continuously for a long time under the condition of 60 ℃ and pH 2-11.
The ultrafiltration membrane can be divided into plate and frame type (plate type), hollow fiber type, nano membrane surface ultrafiltration membrane, tube type, roll type and other structures according to the structure type. Among them, hollow fiber ultrafiltration membrane is a more mature and advanced form of ultrafiltration technology. The outer diameter of the hollow fiber is 0.4-2.0mm, the inner diameter is 0.3-1.4mm. The wall of the hollow fiber tube is covered with micropores. The pore diameter is expressed by the molecular weight of the material that can be intercepted, and the intercepted molecular weight can reach thousands to hundreds of thousands. The raw water flows in the outer or inner cavity of the hollow fiber under pressure, forming the outer and inner pressure hollow ultrafiltration membranes respectively. Ultrafiltration is a dynamic filtration process. The entrapped substances can be removed with the concentrate without blocking the membrane surface, and can be operated continuously for a long time.
Advantage
A. Ultrafiltration membrane element adopts the products of famous membrane company, which ensures that customers get organic membrane element, so as to ensure the retention performance and membrane flux.
B. The system has the advantages of high recovery rate, high quality products, high efficiency separation, purification and high multiple concentration of materials.
C. There is no phase change in the treatment process, and there is no adverse effect on the components of the material. The separation, purification and concentration process is always at room temperature. It is especially suitable for the treatment of heat sensitive substances, completely avoiding the abuse of high temperature destroying the biological active substances, and effectively retaining the biological active substances and nutrients in the raw material system.
D. The system has low energy consumption and short production cycle. Compared with the traditional process equipment, the operation cost of the equipment is low, which can effectively reduce the production cost and improve the economic benefits of the enterprise.
E. The system has advanced process design, high degree of integration, compact structure, less floor space, simple operation and maintenance, and low labor intensity.
F. The system is made of sanitary pipe valve, which is clean on site and meets the requirements of GMP or FDA production specifications.
G. The control system can be personalized designed according to the user's specific use requirements, combined with advanced control software, on-site centralized monitoring of important process operation parameters, avoiding manual misoperation, and ensuring the long-term stable operation of the system.
application area
◆ mineral water: in the manufacturing of mineral water, ultrafiltration technology is applied. In the engineering design, according to the analysis report of the water source and quality of mineral water, the pore diameter and type of membrane will be specifically selected to design the ultrafiltration design.
◆ food: ultrafiltration technology is gradually adopted in the production of dairy products, juice, wine, condiment and other foods, such as separation of protein and low molecular weight lactose in milk or whey from water, clarification and sterilization of juice, removal of colored protein, polysaccharide and other colloidal impurities in wine, and removal of bacteria in soy sauce and vinegar. Compared with traditional methods, it shows economy, reliability and quality assurance Advantage.
◆ medicine: in pharmaceutical and biochemical production, it is often necessary to separate and purify the heat sensitive substances. Ultrafiltration technology shows its outstanding advantages. The separation and concentration of bioactive substances (such as enzymes, viruses, nucleic acids, special proteins, etc.) by ultrafiltration is quite suitable for drugs (such as alkaloids, hormones, etc.) extracted from driven and plants. There are often macromolecules or solid substances in the extract. In many cases, ultrafiltration can be used to separate and improve the quality of products.
◆ pure water and ultra pure water: primary purification of industrial water, RO pretreatment for preparation of pure water and ultra pure water, terminal treatment of pure water and ultra pure water.
◆ environmental protection: advanced treatment of industrial wastewater, urban reclaimed water recycling system, recovery of electrophoretic paint and oil products.
◆ fermentation: separation and purification of biochemical fermentation liquid, concentration and purification of enzyme, clarification and filtration of sugar and xylitol.
