Ultrafiltration membrane technology is a membrane permeation separation technology that is capable of purifying, separating, or concentrating solutions, between microfiltration and nanofiltration. Ultrafiltration membranes are effective barriers for suspended particles and colloidal substances. At the same time, ultrafiltration membranes can also achieve effective removal of two insects, algae, bacteria, viruses and aquatic organisms, so as to achieve the purpose of purification, separation and concentration of solutions. Compared with traditional techniques, ultrafiltration membrane technology has many advantages such as low energy consumption, low operating pressure, high separation efficiency, large flux, and recyclable useful substances in water treatment. It is widely used in drinking water purification, domestic wastewater recovery, and oily wastewater. In the water treatment of pulp wastewater, seawater desalination, etc. Here, this article briefly describes the application of ultrafiltration membrane technology in environmental engineering water treatment for reference.
The basic principle of ultrafiltration membrane technology
UltraFiltration (UF) is the solution under pressure, the solvent and some low-molecular-weight solutes pass through the membrane pores to the other side of the membrane, and the polymer solute or other emulsified micelle groups are trapped to realize the solution from the solution. The purpose of separation. The retention mechanism is mainly sieving action, but sometimes the chemical properties of the membrane surface (electrostatic action of the membrane) also play a role in retention. In the ultrafiltration separation, after a certain pressure is applied to the feed liquid, three methods of high-molecular substances, colloidal substances being adsorbed on the surface of the membrane and micropores, blocked in the pores, and retained and mechanical sieving of the membrane surface are performed in three ways. Ultrafiltration membranes stop, while water, inorganic salts, and low-molecular substances penetrate the membrane.
The ultrafiltration membrane technology has a cut-off molecular weight range of about 500-500000, a corresponding pore diameter of about 0.002-0.1 μm, an operating static pressure difference of generally 0.1-0.5 MPa, and a diameter of the separated component of about 0.005-10 μm.
Ultrafiltration membrane technology features
The removal efficiency of impurities is high, and the quality of produced water is much better than traditional methods.
Completely eliminate or greatly reduce the use of chemical agents and avoid secondary pollution.
The system is easy to automate and has high reliability. The operation is simple and the facilities only have to be turned on and off.
Has good chemical stability, acid, alkali and hydrolysis resistance, can be widely used in various fields.
The heat-resistant temperature can reach 140°C. It can be sterilized with ultra-high temperature steam and ethylene oxide. It can be used in a wide range of pH. It can be used under strong acid and alkali and various organic solvents.
With high filtration accuracy, it can effectively remove 99.99% of harmful substances such as colloids, bacteria and suspended matters in water.
Compared with the conventional water treatment system, the cost of domestic sewage is filtered by ultrafiltration to make the treated water better and reused. However, due to the fact that the general technology cannot meet the standard, ultrafiltration technology can fully treat the wastewater.
Application of Ultrafiltration Membrane Technology in Water Treatment
Drinking water purification
At present, with the increasing seriousness of water pollution in China, new water quality problems have emerged in China, such as Giardia and Cryptosporidium (two bugs), leeches and red worms, algae pollution, and odors and algal toxins. Problems, biological stability of water, etc. When the ultrafiltration membrane technology is applied to the purification of drinking water, it can remove microorganisms including water fleas, algae, protozoa, bacteria and even viruses in the water, and cause pathogenic microorganisms, turbidity, natural organic substances, trace organic substances in the water. Pollutants, ammonia nitrogen, etc. have better treatment effects and can meet people's requirements for water quality.
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