| C 0 | solute concentration in the feed (kg/m3) |
| Cm | solute concentration in the membrane (kg/m3) |
| Cp | solute concentration in the permeate (kg/m3) |
| Cs | logarithmic average solute concentration between feeding and permeate (kg/m3) |
| FF | fouling factor (%) |
| Js | solute flux density (kg/m2s) |
| Jv | solvent flux density (kg/m2s) |
| Lp | solvent permeability coefficient (m/s) |
| L p0 | initial solvent permeability coefficient (m/s) |
| Lpf | final solvent permeability coefficient (m/s) |
| Ps | solute permeability coefficient (m/s) |
| r | rejection (dimensionless) |
| R | rejection coefficient (%) |
| Robs | observed rejection coefficient (%) |
| ΔP | operating pressure (Pa) |
| ΔП | osmotic pressure (Pa) |
| σ | reflection coefficient |
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