Membrane Filtration – Ultrafiltration (UF)
UF membranes have pore sizes of approx. 0.005-0.05 micron. They facilitate the removal of molecules with higher molecular weights (e.g. proteins), while allowing dissolved ions and molecules with low molecular weights to pass. This means that conventional UF membranes can capture all microbes and bacteria, and also viruses.
Ultrafiltration has occupied an established position in the drinking water treatment sector. It allows the safe, high-quality conversion of differing types of raw water into drinking water. Moreover, ultrafiltration is steadily gaining in importance in the wastewater treatment sector. For example, as a rule the MBR process (membrane bioreactor) consists of an ultrafiltration system in tandem with a biological reactor, which replace conventional post-treatment.
WABAG has employed ultrafiltration plants on several occasions for drinking water treatment. As one of the main treatment phases, the process even allows the treatment of wastewater. Following a series of process stages (e.g. ozonation, active carbon filtration), in Windhoek, Namibia, ultrafiltration secures the high quality of drinking water, which is largely produced from municipal wastewater.
WABAG has also repeatedly used ultrafiltration for industrial water treatment. The cleaned water meets the strictest purity level demands, e.g. requirements for water reuse.
The company has already completed several MBR plants for the municipal wastewater sector. In such plants, the effectiveness of the biological degradation of organic matter is enhanced and the membrane filtered run-off is practically free of suspended substances, bacteria and viruses.
Ultrafiltration is also used as a safe pre-treatment prior to reverse osmosis.
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