Membrane Flux Calculator
Calculate permeate flux, transmembrane pressure, and fouling indicators for membrane filtration systems (MF/UF/NF/RO).
Inputs
MGD
m²
bar
°C
Results
Permeate Flux
56.8 LMH
Specific Flux
113.6 LMH/bar
Fouling StatusLight Fouling
Temperature-Corrected Flux64 LMH (20°C)
Concentrate Flow0.2 MGD
Concentration Factor10×
Membrane Modules143
Pressure Vessels24
CIP Cleaning FrequencyEvery 14-30 days
Annual Energy Cost$4,796,962
Annual Membrane Cost$59,583
Concentrate Flow LPH31,541.67%
Specific Energy17.36
How to Use This Calculator
- Enter Feed Flow Rate (MGD) and Total Membrane Area (m²) installed in the system.
- Input Transmembrane Pressure (bar) — the operating pressure differential across the membrane.
- Set Water Temperature (°C) — flux increases with temperature; enter the design minimum for conservative sizing.
- Enter Recovery Rate (%) — the fraction of feed water converted to permeate.
- Review Permeate Flux (LMH) and Specific Flux (LMH/bar) to assess whether the system is operating within design parameters.
- Check Fouling Status and Temperature-Corrected Flux to identify if cleaning or backwash is needed.
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