Ultrafiltration Membrane
Water Requirements
Secondary reverse osmosis purified water Inlet conductivity should be ≤ 5μs/cm
Treatment effect
Produced water resistivity: ≥ 15MΩ
Working environment parameters
temperature:5-35℃ pH:6.0~9.0
Water production
0.5-50(m3/H)
Inlet pressure
≤ 0.6MPa
Operation Mode
Fully automatic
Introduction
Ultrafiltration is a sieving process that utilizes membrane (nanometer-level) separation technology. Driven by the pressure difference on both sides of the membrane and with the ultrafiltration membrane as the filtering medium,numerous tiny micropores densely distributed on the surface of the ultrafiltration membrane only allow water, small molecular substances and dissolved solids to pass through and become the permeate, while substances in the original liquid whose volumes are larger than the micropore diameters on the membrane surface are retained on the inlet side of the membrane and become the concentrated liquid. Thus, the purposes of purifying, separating and concentrating the original liquid are achieved. The filtration precision of ultrafiltration ranges from 0.002 to 0.1 micrometers, and the molecular weight cut-off is between 1,000 and 100,000.
Internal Pressure Ultrafiltration Membranes
These ultrafiltration membranes are made of modified PAN alloy materials. They possess outstanding separation performance, good antioxidant properties, thermal stability, and also have excellent mechanical properties and permanent hydrophilicity. Despite these advantages, there is a slight drawback in that their anti-fouling performance is somewhat inferior. To address this issue, we have overcome the above shortcomings through modifications to the materials and the membranes, making their performance even better.
The membrane filaments have high strength, with a breakage rate of less than three per thousand. There is a uniquely designed central tube support, which enables the membrane filaments to be evenly distributed and the water flow to be stable, thus prolonging the service life of the membrane filaments. The membranes are reliable in performance, and neither water washing nor chemical washing will affect their normal use. Depending on the water quality conditions, either dead-end filtration or cross-flow filtration can be chosen. Dead-end filtration has the advantages of energy conservation and high water utilization rate, while crossflow filtration can promptly discharge pollutants, reduce the frequency of membrane cleaning, and extend the service life of the membrane modules. Compared with traditional filtration methods, this system features a high degree of automation, occupies a small area (only half of that of traditional filtration methods), has high filtration precision, and can be unattended. It is an ideal choice for reverse osmosis pretreatment.
External Pressure Ultrafiltration Membranes
These ultrafiltration membranes are made of polyvinylidene fluoride (PVDF) material. Their most prominent feature is extremely high chemical stability. And this chemical stability determines their outstanding antioxidant ability and acid-alkali resistance. In order to ensure the normal operation of the membrane elements and stabilize the water flux, it is necessary to clean the membranes regularly. The most effective method is cleaning with oxidizing agents. However, oxidizing agents can cause damage to the membranes. The ability of polyvinylidene fluoride (PVDF) to tolerate oxidizing agents (such as sodium hypochlorite) is more than 10 times that of materials like polyethersulfone and polysulfone, thus greatly extending its service life.
Polyvinylidene fluoride also has extremely strong flexibility. The results of actual case investigations show that PVDF membranes have the advantage of the lowest breakage rate of membrane filaments. It has been increasingly widely used in the field of sewage treatment.
A brief introduction to the characteristics of PVDF membrane modules:
1.High antioxidant property and good tolerance to cleaning: High-quality polyvinylidene fluoride material determines the strong chemical stability of the membrane products. And the high chemical stability of the membrane enables it to withstand the cleaning with high-concentration oxidizing agents, which can effectively prevent the reproduction of microorganisms such as bacteria. It is made of polyvinylidene fluoride (PVDF) material, and its most prominent feature is extremely high chemical stability. And this chemical stability determines…
2.High flux: The product has a high porosity, which enables the membrane modules to have a high flux.
3.High strength and good flexibility: The membrane filaments have high strength and excellent flexibility. During the cleaning process, they are not prone to breakage.
4.High anti-fouling property: Through hydrophilic modification, the anti-fouling property of the product is greatly improved.
5.Good water production quality: Ultrafiltration membranes have a small nominal pore size. Therefore, when using this product, almost all suspended particles, microorganisms, colloids, pathogens and bacteria can be removed.
6.Long service life: The membrane modules usually adopt an external pressure structure that is not easily clogged, have a larger filtering area and a higher pollutant interception capacity, are easy to clean and can be cleaned more thoroughly. They can remove the pollution on the membrane surface in a timely manner, making the service life of the membrane longer.
Application
▪ Municipal sewage treatment and reuse;
▪ Water supply treatment in water supply plants;
▪ Treatment of domestic and commercial water;
▪ Concentration and purification in biopharmaceutical industry;
▪ Pretreatment of reverse osmosis systems;
▪ Preparation of industrial pure water and ultra-pure water;
▪ Industrial wastewater treatment;
▪ Sterilization and purification of water used in the food industry.
