Table 3 Hydrodynamic resistance of the membrane and their selectivity (repeated testing at 0.3 MPa)
Cycle number | Pristine membrane | Modified membrane ( m = 0.047) | ||
|---|---|---|---|---|
Selectivity, φ, % | Treatment with water after separation and cleaning, R , m −1 | Selectivity, φ, % | Treatment with water after separation and cleaning, R , m −1 | |
1 | 31 | 5.05 × 1013 | 34 | 2.53 × 1013 |
2 | 32 | 5.15 × 1013 | 35 | 2.66 × 1013 |
3 | 32 | 5.18 × 1013 | 36 | 2.68 × 1013 |
4 | 32 | 5.21 × 1013 | 36 | 2.69 × 1013 |
5 | 32 | 5.23 × 1013 | 36 | 2.70 × 1013 |
Chemical regeneration | ||||
6 | 32 | 5.07 × 1013 | 34 | 2.56 × 1013 |