+86 18221094035

chirs@shchenmo.com

SHANGHAI CM

Get Quote

Nanofiltration Membranes (NF)

If you are looking for a professional nanofiltration membranes (nf) in China, then Shanghai CM can be your first choice. CM has been an expert nf membranes supplier in China since 2009.

Get a Solution Now Explore Products

Since 2009

60+ Countries

1000+ Clients

System Design

Support system customized design, please tell us your needs and we will provide you with the best solution

Advanced Nanofiltration System

State-of-the-art nanofiltration technology designed for optimal water treatment efficiency and reliability.

Custom System Blueprint

Tailored system designs engineered to meet specific industrial requirements and operational standards.

Production Lines and Warehouses

Our state-of-the-art manufacturing facilities and warehouses ensure quality production and efficient logistics management

Automated Production Line

High-efficiency automated systems for precision manufacturing

Quality Control Station

Rigorous testing and quality assurance processes

Assembly Workshop

Skilled technicians ensuring precise component assembly

Testing Laboratory

Advanced testing equipment for product validation

Warehouse Storage

Organized inventory management and storage systems

Logistics Center

Efficient packaging and shipping operations

Ready to Start Your Custom Project?

Contact our engineering team to discuss your specific requirements and get a tailored solution designed for your needs.

RO vs NF: Understanding the Difference

Explore the key differences between Reverse Osmosis and Nanofiltration membrane technologies

Key Distinction

Although RO and NF are very similar, they can be distinguished based on the size of particles each is capable of removing. Both technologies can remove finer contaminants than MF and UF, including hardness, nitrates, sulfates, TDS, heavy metals, radionuclides, and organic macromolecules.

Reverse Osmosis (RO)

Particle Removal Size

0.1 nm

Extremely fine filtration

RO is the best of all membrane filtration systems, with extremely small pore sizes. Developed in the 1950s, it's primarily used for desalination - producing drinking water from seawater or brackish water sources.

Key Applications:

Seawater desalination
Brackish water treatment
Industrial process water (printing industry)
Complete ion removal

Removes ALL ions regardless of size

Nanofiltration (NF)

Particle Removal Size

0.002-0.005 μm

Selective filtration

NF has a slightly coarser filtration effect than RO. This relatively new technology was developed primarily for drinking water production, offering selective removal capabilities.

Key Features:

Removes pesticide compounds
Filters organic macromolecules
Retains beneficial minerals
Selective ion removal

Removes: Divalent ions (Ca²⁺, SO₄²⁻)

Allows: Monovalent ions (Na⁺, Cl⁻)

Comparison Summary

Aspect	Reverse Osmosis (RO)	Nanofiltration (NF)
Pore Size	0.1 nm (smallest)	0.002-0.005 μm
Development Era	1950s (established)	Recent technology
Primary Use	Desalination	Drinking water production
Ion Selectivity	Removes all ions	Selective removal
Mineral Retention	No	Yes (beneficial minerals)

Nanofiltration Membrane Technology

Understanding the Filtration Principles and Ion Rejection Mechanisms

Advanced Separation Donnan Effect Ion Selectivity

What is Nanofiltration?

Nanofiltration membrane is a revolutionary separation technology that emerged in the late 1980s. With pore sizes ranging from 1-2nm, these membranes bridge the gap between reverse osmosis and ultrafiltration systems.

Pore Size

1-2nm

Molecular Weight Cutoff

100-2000Da

Filtration Principles

Nanofiltration operates through a combination of size exclusion and electrostatic interactions, making it highly effective for selective ion separation and molecular filtration.

Ion Rejection Performance

Divalent Ions (Higher Rejection)

Mg²⁺95%+

Ca²⁺95%+

Cu²⁺98%+

Fe²⁺98%+

Monovalent Ions (Lower Rejection)

Na⁺20-50%

K⁺15-40%

Cl⁻25-45%

NO₃⁻10-30%

Experimental Research Conclusions

Valence Impact

Ion valence significantly affects rejection rates. Cation valence has greater impact than anion valence on overall membrane performance.

Complex Ions

Nanofiltration membranes demonstrate higher rejection rates for complex ions compared to simple ionic species.

Shannon Radius

Ion rejection correlates with Shannon radius - anions follow the same pattern while cations show opposite behavior.

Industrial Applications

Water Treatment

Municipal and industrial water purification

Food Processing

Concentration and purification processes

Pharmaceutical

Drug purification and separation

Chemical Industry

Process separation and recovery

Learn More About Membrane Technology

Stay tuned for our next article featuring detailed experimental processes and specific ion rejection data from Blue Membrane Water Treatment.

SHANGHAI CM

Leading manufacturer of water treatment membranes and systems since 2009, serving over 60 countries worldwide.

Our Products

Quick Links

Stay Updated

Subscribe to our newsletter for the latest product updates and industry news.

Building 9, No. 1188 Jiangyue Road, Minhang District, Shanghai

+86 18221094035

chris@shchenmo.com