Nanofiltration (NF) Water Treatment Equipment

Nanofiltration (NF) is a pressure-driven membrane separation technology between ultrafiltration and reverse osmosis, with a filtration accuracy of approximately 0.001-0.01 microns (1-10 nanometers) and a molecular weight cut-off (MWCO) typically between 200-1000 Daltons.

NF membranes carry a surface charge and have high rejection rates for divalent and multivalent ions (such as Ca²⁺, Mg²⁺, SO₄²⁻) — typically ≥90% — while having low rejection rates for monovalent ions (such as Na⁺, Cl⁻) — typically 20%-50%. NF enables selective desalination while removing organic matter, color, hardness, pesticide residues, etc., with operating pressure lower than reverse osmosis (approximately 0.5-1.0 MPa).

Main Components:

• Pre-treatment unit: Raw water tank, raw water pump, multi-media filter, activated carbon filter, water softener (optional), cartridge filter

• Nanofiltration unit: High-pressure pump, NF membrane modules (spiral-wound composite membranes), NF main frame

• Cleaning unit: Cleaning tank, cleaning pump, cleaning filter

• Control system: PLC automatic control, touch screen operation, online conductivity meter, flow meter, pressure gauge, automatic flushing function

Features:

• Selective desalination: removes divalent ions (hardness, sulfates) while retaining some monovalent ions

• Filtration accuracy between UF and RO (0.001-0.01μm)

• Operating pressure: 0.5-1.0 MPa, lower than RO (0.8-1.5 MPa)

• Efficient removal of organic matter, color, pesticides, antibiotics, and other trace contaminants

• Good softening effect, replacing traditional salt-regeneration softeners

• High recovery rate: 80%-85%

• Stable product water pH, no post-treatment adjustment required

Applications:

• Drinking water treatment: removes hardness, color, organic matter, and trace contaminants while retaining beneficial minerals

• Food & beverage industry: whey desalination, juice concentration, sugar syrup refining

• Pharmaceutical industry: antibiotic concentration, amino acid separation

• Chemical industry: dye desalination, chemical recovery

• Wastewater treatment: textile, printing and dyeing, electroplating wastewater reuse

• Seawater desalination pre-treatment: reduces RO feed water hardness