DESCRIPTION:
Membranes for nanofiltration
Nanofiltration (NF) retains multivalent ions (e.g., Ca²⁺, Mg²⁺, SO₄²⁻) and many organic molecules while showing moderate retention of monovalent salts. Typical uses include water softening, sulfate cut and color/NOM or micropollutant reduction.
STANDARD SPECIFICATION:
– Membrane: thin‑film composite polyamide
– Element sizes: 4″×40″ and 8″×40″; also 2.5″/1.8″ on request
– Typical rejection: MgSO₄ ≥ 97–99 %, hardness ≥ 90–98 %; NaCl ~ 20–60 % (type‑dependent)
– Design flux (20 °C): 20–40 LMH; operating pressure 6–25 bar
– pH operation 2–11 (CIP to 12); max temp 45 °C; free chlorine < 0.1 mg/L INDUSTRY USE CASES:
– Pesticide/micropollutant and color removal (NOM)
– Water softening and sulfate removal
– Partial desalination with improved energy profile vs RO
PRETREATMENT / INTEGRATION NOTES:
– Pretreatment to SDI15 ≤ 3; antiscalant selection per saturation indices
– Dechlorination to protect polyamide; define CIP windows
STANDARD SCOPE OF SUPPLY:
– NF elements and pressure vessels
– HP pump and chemical dosing (antiscalant/SBS)
– CIP system and SOPs
INLET REQUIREMENTS:
– Pretreatment to SDI15 ≤ 3 (≤ 2 preferred)
– Dechlorinated feed (free chlorine < 0.1 mg/L) OPTIONS:
– Low-fouling or high-rejection variants
– Antiscalant dosing and CIP system
HOMOLOGATIONS / STANDARDS:
– Skids CE-marked; pressure vessels PED/ASME
PACKAGING / DELIVERY:
– Elements sealed wet in original packaging
– Pressure vessels crated; CIP chemicals list provided
PRICE DISPLAY:
Price on request
