Understanding the differences between membrane types is crucial for selecting the right treatment solution. This guide compares ultrafiltration, microfiltration, nanofiltration, and reverse osmosis.

Membrane Separation Spectrum

Membranes are classified by pore size:

• Microfiltration (MF): 0.1-1.0 micron – bacteria, suspended solids
• Ultrafiltration (UF): 0.01-0.1 micron – viruses, proteins, colloids
• Nanofiltration (NF): 0.001-0.01 micron – multivalent ions, color
• Reverse Osmosis (RO): less than 0.001 micron – monovalent ions, dissolved salts

Application Guide

Microfiltration (MF)

• Prefiltration for finer membranes
• Clarification of surface water
• Bacteria and algae removal
• Low pressure operation (0.1-0.3 bar)

Ultrafiltration (UF)

• MBR membrane protection
• Protein concentration
• Wastewater polishing
• Drinking water treatment
• Operating pressure: 0.3-1.5 bar

Nanofiltration (NF)

• Hardness removal (partial)
• Color and organics removal
• Dairy applications
• Operating pressure: 3-15 bar

Reverse Osmosis (RO)

• Seawater desalination
• Brackish water treatment
• Ultrapure water production
• Pharmaceutical water (WFI)
• Operating pressure: 15-80 bar

Selection Criteria

Choose based on:

• Required rejection rate
• Feed water quality
• Flow rate requirements
• Operating pressure limits
• Recovery rate targets

Need help selecting the right membrane? Our engineers can recommend the optimal solution.

Email: sale@yixingenviroequipment.com