Ultrafiltration Membrane Filtration
Ultrafiltration membrane filtration (UF) is a low pressure membrane process for water treatment that is designed to remove turbidity causing particles including those comprised of suspended solids, bacteria, colloidal matter and proteins.
The main separation mechanism of UF membrane filtration is size exclusion or sieving and the graphic illustrates that UF effectively removes particles in the size range of less than 0.01 to 0.1 mm. Effective removal of these contaminants in a source water results in a filtrate well suited for further treatment by downstream reverse osmosis (RO).
The UF process is used in a wide variety of applications and industries and typical feed sources include seawater, surface, well and waste waters.
Superior to sand filters and traditional media filtration
As with most conventional filtration methods, sand filters and media filtration require consistent raw water quality to deliver quality effluent, which is not always possible. They also don't provide an absolute barrier. Traditional media filters typically remove particles to down to about 5 microns.
Ultrafiltration (UF), however, does not suffer from those limitations. This technology uses an ultrafiltration membrane barrier to exclude particles 0.02 to 0.05 microns, including bacteria, viruses, and colloids, meeting increasingly stringent water-quality standards around the world, and providing a stable, reliable, and consistent water quality.
UF offers:
* High and consistent product quality measured by turbidity (NTU) or silt density index (SDI).
* Tolerance to feedwater quality upsets.
* No use of pretreatment chemicals (polymer, coagulant, pH adjustment) and associated costs for sludge disposal.
* Small footprint and less weight than media filters.
When used as a pretreatment for reverse osmosis (RO) , UF also helps reduce fouling of the RO membranes, which can lead to:
* Reduced chemical cleaning frequency and consequently, lower operating costs and downtime.
* The potential to operate RO at higher flux, with fewer membranes and vessels — leading to lower capital cost for the RO system.
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