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What is ultrafiltration?
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Reverse osmosis membranes RO
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Industrial Reverse Osmosis Membrane – KeenSen BW-4040 Industrial Reverse Osmosis Membrane – KeenSen ULP-4040HF Reverse Osmosis Membrane – KeenSen 100 GPD Reverse Osmosis Membrane – KeenSen 50 GPD Hydron FRPV Series Membrane Carriers LG Reverse Osmosis Membranes Residential reverse osmosis membranes Hydron BW reverse osmosis membranes
It is a separation process based on a porous membrane with openings between 0.01 and 0.1 microns.
Ultrafiltration membranes are more closed compared to microfiltration , but more open than nanofiltration and Reverse osmosis RO The membranes work with low pressure, which results in lower operating costs. In addition, they are very effective as a pretreatment for Reverse osmosis RO , and they also have a backwash system, which gives them a longer life.
Ultrafiltration uses hydrostatic pressure to force water through a semi-permeable membrane. The type of membranes that constitute ultrafiltration can be spirals that use cross-flow separation, hollow fiber membranes and tubular. The ultrafiltration system works to remove contaminants with molecular weights of 300 to 500’000 Dalton (1) .
The membranes remove very small particles, such as chlorine-resistant organisms, bacteria, organics, sediments, high molecular weight solutes and other suspended solids. As in microfiltration , ultrafiltration is mostly applied as a pre-treatment for Reverse osmosis RO , as well as a stand-alone treatment.
Ultrafiltration has a wide filed of application, working as a pretreatment and in processes where excellent quality water is needed. It also a fundamental part in the separation of food grade emulsions, specifically in the processes of milk, serum, cheese, etc. Some examples of its main applications are:
Whey protein concentration.
Concentration of vegetable proteins such as oats, canola or soya.
Starch recovery.
Water Treatment
Fruit juice, wine and beer clarification.
Starch recovery.
Remember that:
1 mm = 1000 μm
1 μm = 1000 nanometers (nm)
1 nm = 10 Angstroms (Å)
Cheryan, M . MEMBRANE SEPARATIONS | Ultrafiltration. Reference Module in Chemistry, Molecular Sciences and Chemical Engineering. s.l. : Elsevier, 2013.
Last modified: March 26, 2021
