The principle of ultrafiltration system in pure water equipment

In principle the authors water equipment ultrafiltration system: ultrafiltration process principle is the principle of a membrane separation, membrane ultrafiltration using a pressure-active, trapped water at ambient pressure and colloidal driving force effects, and the molecular weight is relatively particles The separation process of high matter, water and small solute particles through the membrane. Through the micropores on the outer surface of the membrane, materials with a molecular weight cut off of 3x10000-1x10000 can be selected. When the treated water passes through the surface of the membrane at a certain flow rate with the help of external pressure, water molecules and solutes with a molecular weight of less than 300-500 permeate the membrane, while particles and macromolecules larger than the membrane pores are intercepted due to the sieving effect. So that the water is purified. In other words, when the water passes through the ultrafiltration membrane, most of the colloidal silicon rich in the water can be removed, and at the same time a large amount of organic matter can be removed. The principle of ultrafiltration is not very complicated. In the ultrafiltration process, because the trapped impurities accumulate on the outer surface of the membrane, concentration polarization will occur. When the solute concentration on the membrane surface reaches a certain limit, a gel layer is formed, which makes the membrane's water permeability drop sharply. This restricts the use of ultrafiltration to a certain extent. For this reason, it is necessary to conduct experiments and research to determine the best skills and operating conditions, to minimize the impact of concentration polarization, and to make ultrafiltration a reliable reverse osmosis pretreatment method. 1. Ultrafiltration has effective removal characteristics for all kinds of colloids in water, so it can be considered to be extended to the pretreatment of condensate polishing and ion exchange desalination systems. 2. Compared with traditional pretreatment technology, ultrafiltration has simple system, convenient operation, small area, low investment, and excellent water quality, which can satisfy the water inlet requirements of various reverse osmosis devices. 3. Reasonable selection of cleaning technology and operating conditions can thoroughly control the problems caused by the concentration polarization of ultrafiltration, making this pretreatment method more reliable. In the process of ultrafiltration, the deep-water liquid flows through the surface of the membrane under pressure. The deep agent and small molecular solutes smaller than the membrane pores permeate the membrane and become purified liquid. Solutes and solute groups larger than the membrane pores are intercepted and flow with the water. Exhausted, it becomes a deep shrinking fluid. The ultrafiltration process is dynamic filtration, and the separation is completed in an active state. Ultrafiltration is one of the membrane separation technologies with pressure as the driving force. With the intention of separating macromolecules from small molecules, the pore size of the membrane is between 20-1000A°. The hollow fiber ultrafilter has the advantages of high filling density in the unit dissolver and small floor space.