Ultrafiltration (UF)
Ⅰ. Filtration principle
The ultrafiltration process can be understood as a screening process related to the size of the membrane pore diameter. Driven by the pressure difference between the two sides of the membrane, the ultrafiltration membrane is used as the filtration medium. Under a certain pressure, when the raw liquid flows through the membrane surface, many small pores on the surface of the ultrafiltration membrane allow only water and small molecules to pass through and become permeate, while substances with a volume larger than the pore diameter of the membrane surface are trapped on the inlet side of the membrane and become concentrated liquid, thus achieving the purpose of purification, separation, and concentration of the raw liquid.
Ⅱ. Characteristics of ultrafiltration membrane separation technology
Compared to other membrane separation technologies such as reverse osmosis membranes and gas separation membranes, the separation process of ultrafiltration has the following significant characteristics:
1. It is carried out at room temperature and low pressure, resulting in low energy consumption and thus low operating costs for the equipment.
2. The equipment is small in size and simple in structure, so the investment cost is low.
3. The ultrafiltration separation process is simply the pressurized delivery of liquid, with a simple process flow and easy operation and management.
4. The ultrafiltration membrane is a uniform and continuous body made of polymer materials, and it is filtered by pure physical methods, so that the material does not undergo qualitative changes during the separation process. And there will be no impurities falling off during use, ensuring the purity of the ultrafiltrate.
The above characteristics determine the wide application of ultrafiltration membrane, from the purification of ordinary household drinking water to large-scale applications in high-tech fields. Therefore, ultrafiltration membrane separation technology is a membrane separation technology with broad development prospects.
III. Technical Parameters
Nature Company has selected the SKS-N-8060 ultrafiltration membrane element from the German THINKS brand. Its structure employs an internal pressure hollow fiber ultrafiltration membrane. Specific parameters are as follows：
| Membrane form |
Internal pressure hollow fiber |
| Membrane materials |
PVDF synthetic material |
| Shell material |
UPVC |
| Membrane pore size |
0.05µm |
| Outer diameter * inner diameter of filaments |
1.5mm*0.9 mm |
| The component models |
SKS-N-8060 |
| Effective membrane area (m2) |
51 |
| Nominal outer diameter of film (mm) |
225 |
| Pure water transmittance (25°C) |
6.5 |
| Component water volume （L） |
30 |
| Maximum inlet pressure |
3.0 bar |
| Produced water turbidity |
≤0.1NTU |
| Water production SDI |
≤3 |
| TOC Removal rate |
0%~60% |
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