Ultrafiltration (UF)
I. Principle of filtration
Ultrafiltration process can be understood as the screening process related to membrane aperture size, driven by the pressure difference on both sides of the membrane, ultrafiltration membrane as the filter medium, under certain pressure, when the original fluid flow through the membrane surface, ultrafiltration membrane surface with many tiny pores allow only water and small molecules through and become through the liquid, and concentrate in the volume is greater than the membrane surface micro aperture that substance is trapped on the inlet side of the membrane, liquid becomes, thus realize the concentrate of purification, separation and enrichment.
Ⅱ.Characteristics of ultrafiltration membrane separation technology
Compared with other membrane separation technologies such as reverse osmosis membrane and gas separation membrane, the separation process of ultrafiltration has the following significant characteristics:
1、The separation is performed 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 process of ultrafiltration separation is simply pressurized liquid transportation with simple technological process and easy operation and management.
4、Ultrafiltration membrane (UF) is a homogeneous continuum made of polymer materials. It is filtered by pure physical method, and the substance does not change in the process of separation. And in the use process will not have any impurity to fall off, guarantees the ultrafiltrate pure.
The above characteristics determine that the application of ultrafiltration membrane is very extensive, from the purification of ordinary household drinking water to the high-tech field has a large scale of application, so the ultrafiltration membrane separation technology is a membrane separation technology with broad development prospects.
Iii. Technical parameters
The company chooses the German THINKS brand SKS-N-8060 ultrafiltration membrane element, whose structure is hollow fiber ultrafiltration membrane under internal pressure. The 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% |
