What is a Nanofiltration (NF) System?
Nanofiltration is a membrane process that removes particles, organic molecules, and divalent ions (e.g., Ca²⁺, Mg²⁺, SO₄²⁻) from water, while allowing monovalent ions (e.g., Na⁺, Cl⁻) to pass. It operates at lower pressures than RO, targeting selective separation.
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![Nano Filtration]()
Nano Filtration1.Size & Charge Exclusion: Rejects divalent ions (Ca²⁺, Mg²⁺, SO₄²⁻) and organics >200 Da via steric hindrance and electrostatic repulsion.view more
2.Low-Pressure Operation: Requires only 5–15 bar (70–220 psi) – 40% lower energy vs.... -
![Nano Filtration Membrane]()
Nano Filtration Membrane1.Size & Charge Exclusion: Rejects divalent ions (Ca²⁺, Mg²⁺, SO₄²⁻) and organics >200 Da via steric hindrance and electrostatic repulsion.view more
2.Low-Pressure Operation: Requires only 5–15 bar (70–220 psi) – 40% lower energy vs....
Advantages of NF
Targeted Removal
Efficiently eliminates hardness, heavy metals, and micropollutants (pesticides, PFAS).
01
Lower Energy
30–50% less pressure than RO (5–20 bar).
02
Reduced Scaling
Softens water without ion-exchange resins.
03
Color/Organics Reduction
Removes >90% of natural organic matter (NOM).
04
Minimal Chemical Use
Physical separation with limited additives.
05
- Pore Size: ~1 nm (between RO and UF).
- Charge-Based Separation: Rejects ions via electrostatic repulsion.
- Flux Rate: Higher permeability than RO membranes.
- pH Tolerance: Stable across a wide pH range (2–11).
- Automatic Operation: Integrated CIP (clean-in-place) systems.
- Spiral-Wound NF: Standard industrial configuration.
- Hollow Fiber NF: Higher packing density; fouling-resistant.
- Tubular NF: Handles high-solids/high-viscosity feeds.
- Hybrid NF-RO: Combines NF pre-treatment with RO for optimized desalination.
- Solar-Driven NF: Off-grid operation using solar energy.
Applications
Drinking Water
Hardness removal, NOM/color reduction.
Wastewater Reuse
Industrial effluent polishing (textile, pharma).
Food & Beverage
Dairy processing (lactose removal), juice concentration.
Textile Industry
Dye/salt separation from wastewater.
Pharmaceuticals
Purification of active ingredients.
Mining
Selective metal recovery (e.g., Li⁺, Co²⁺).
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