Products
Nanofiltration (NF) Systems
Selective ion removal, softening, and colour reduction at lower operating pressures.
Overview
Nanofiltration (NF) membranes occupy the performance range between ultrafiltration and reverse osmosis — rejecting divalent ions (calcium, magnesium, sulphate), natural organic matter (NOM), colour, and hardness while passing monovalent ions (sodium, chloride) at higher rates. Operating at 5–20 bar feed pressure with water recovery of 75–90%, NF systems are used for water softening, colour removal, partial desalination, and organic matter reduction where full TDS removal is not required. Basiia packages NF systems as standalone units or as part of integrated membrane treatment trains.
Typical Applications
- Water softening — removal of hardness (Ca²⁺, Mg²⁺)
- Colour and NOM removal from surface water
- Sulphate removal for seawater injection (SWI) in oil reservoirs
- Partial desalination of brackish water
- Pharmaceutical and food-grade water production
- Dairy and beverage process water treatment
- Textile and dye wastewater treatment
- Pre-treatment for RO systems to reduce scaling potential
Key Features
Engineered for Performance
Divalent Ion Rejection
NF membranes achieve >95% rejection of divalent ions (Ca²⁺, Mg²⁺, SO₄²⁻) while passing monovalent ions at 40–60% — enabling selective softening and sulphate removal without full desalination.
Low Operating Pressure
Feed pressures of 5–20 bar (versus 10–80 bar for RO) reduce energy consumption and allow use of lower-cost pump and pressure vessel materials — making NF economical for large-volume softening and colour removal applications.
High Water Recovery
Water recovery of 75–90% reduces concentrate volume and disposal costs — with antiscalant dosing and pH adjustment to maximise recovery within scaling limits.
NOM & Colour Removal
Effective removal of natural organic matter (NOM), humic acids, and colour from surface water sources — reducing disinfection by-product (DBP) formation potential and meeting aesthetic water quality targets.
Sulphate Removal for SWI
Dedicated sulphate removal NF systems for seawater injection (SRI) applications in oil and gas — preventing barium and strontium sulphate scale in reservoir injection wells.
Skid-Mounted Package
Fully integrated skid with NF membrane array, high-pressure pump, antiscalant dosing, cartridge pre-filtration, CIP system, and PLC control — factory assembled and tested before shipment.
Applicable Standards
- ISO 9001
- ASME B31.3 (Process Piping)
- WHO Guidelines for Drinking-Water Quality (potable applications)
- Local environmental discharge regulations
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Get in Touch
Discuss Your Nanofiltration (NF) Systems Requirements
Our engineering team is available to review your project requirements and provide a technical proposal. Contact us to start the conversation.