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Ultrafiltration

Ultrafiltration

OVERVIEW

During ultrafiltration membrane screening with pressure difference on both sides of the membrane and ultrafiltration membrane as a filter medium, when stock solution flows through the membrane surface under certain pressure, only water and small molecular substances can flow through numerous micro-pores which are densely distributed on the surface of the ultrafiltration membrane to form permeate. However, substances in stock solution of which the volume is larger than the diameter of the micro-pores on the membrane surface are intercepted at the fluid inlet side of the membrane to form condensate for the purpose of purification, separation and condensation of the stock solution.

Application of ultrafiltration technology.

Early industrial ultrafiltration technology is applied for wastewater and sewage treatment. With the development of ultrafiltration technology, ultrafiltration technology has been applied in many fields at present, mainly including food industry, beverage industry, dairy industry, biological fermentation, bio-pharmaceutical, pharmaceutical chemical industry, biologics, traditional Chinese preparation, clinical medicine, printing and dyeing wastewater, food industry wastewater treatment, resource recovery and environment engineering.

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Requirements on the quality of feed water

Opacity Granulation Suspension PH value Temperature Counter purge water
< 5 degree < 5 μm <3-5 mg/L 2 - 13 < 45℃ Ultuaflitration

The scope of application of ultrafilteration

Regular substances Relative dimensions Regular substances Relative dimensions Regular substances Relative dimensions
Water soluble salt 3 - 12 Colloid silicon/particle 80 - 2 *102 Red blood cell 5* 104 - 105
Metallic ions 2 - 7 Protein 102 - 3 * 105 Pollen 105 - 106
Sugar 8 - 25 Lacquer paint 105 - 5* 104 Flour 104 - 106
Carbon black 102 - 103 Bacteria 3 * 105 * 105 MIST 100
Virus 102 - 105 Yeast cell 105 - 5 * 105    
The diameter of ultrafilteration membrane microspore is 10 - 10000A.
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