The differences:
It all comes down to pore size. On the membrane separation scale, micro and ultrafiltration are coarser than nanofiltration and reverse osmosis, but are still finer than media filtration. Microfilter pores are within the range of 0.1 to 10 microns and ultrafiltration membrane pores within 0.01 to 0.1 microns. The method chosen for a treatment system is based on the size of the smallest particles that must be retained in the feed water. The difference in their pore size determines the applications for which ultrafiltration purification or microfiltration treatment process would be most applicable to be used for the specific application.It is also a part of an industrial Ro plant.
Removal:
Based on the pore size range of these two separation technologies, below is a list of some of the smallest pollutants that any technology is capable of removing or reducing raw water flows.
Microfiltration (MF):
- seaweed
- Bacterium
- Pathogenic protozoa ( Giardia lamblia and Crypotosporidium)
- Sediment (sand, clay, certain complex metals / particles)
Ultrafiltration:
All contaminants that MF can remove, plus:
- endotoxins
- Plastics
- silica
- Sludge
- Viruses
Applications:
Both microfiltration and UF treatment are useful for water / wastewater treatment in a wide range of industrial and commercial environments. This includes the processing of many types of end products. Below are just a few of the many possible applications for each membrane filter process.
Microfiltration:
- Cold sterilization of drinks and medicines
- Separate bacteria from water
- Clarification of fruit juices, wine or beer
- Petroleum refining
Ultra filtration:
- Lowering the sludge density index for reverse osmosis
- Virus removal from water
- Separation of oil / water emulsions
- Remove pathogens from milk
- Medical applications
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