| MD | Membrane distillation |
| SGMD | Sweeping gas membrane distillation |
| Th | Feed temperature (°C) |
| Qh | Feed flowrate (mL/min) |
| Ci | Feed concentration (g/L) |
| Qa | Sweeping gas flowrate (SCFH) |
| PTFE | Polytetrafluoroethylene |
| FD | Permeate flux (L·m−2·h−1) |
| S | Selectivity (%) |
| SG | Sweeping gas |
| SI | Severity index (%) |
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