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Table I.
COD retentions at limiting and critical fluxes during UF, NF and RO.
| Retention (%) | pH range | At limiting flux | At critical flux |
|---|---|---|---|
| UF | 3.7–6.0 | 56 ± 6 | 50 ± 4 |
| UF | 6.5–11.5 | 54 ± 4 | 40 ± 5 |
| NF | 3.7–11.5 | 99.2 ± 0.8 | 99.2 ± 0.7 |
| RO | 3.7–11.5 | > 99.9 | > 99.9 |