Table 2.
Characteristic properties of UF, NF, and RO membranes.
| Membrane type | Parameters | Specification |
|---|---|---|
| UF | Material | Polyether sulfone |
| Type | Capillary multi bores x 7 | |
| Diameter bores ID | 0.9 mm | |
| Diameter fiber OD | 4.2mm | |
| MWCO | 100KD | |
| Surface area | 50 m2 | |
| Maximum temperature | 40°C | |
| Maximum pressure | 7.5bar | |
| Membrane back wash pressure | 0.5-1bar | |
| Operator pH range | 3-10 | |
| Back wash pH range | 1-13 | |
| Disinfection chemicals | ||
| Hypo chloride (NaOCl) | 50-200 mgL−1 | |
| Hydrogen peroxide (H2O2) | 100-200 mgL−1 | |
|
| ||
| NF (DOW Film Tec 2.5 x 40) | Model | NF 270-2540 |
| Permeate Flow rate | 3.2 m3/day | |
| Active surface area | 28 ft2 (3.2 m2) | |
| Applied pressure | 4.8 bar | |
| Stabilized salt rejection | > 97% | |
|
| ||
| RO (DOW Film) | Model | TW 30-3812-40 |
| Membrane type | Thin film composite (filmtech) | |
| Permeate Flow rate | 83.2 m3/day | |
| Active surface area | 28 ft2 (3.2 m2) | |
| Maximum operating pressure | 1.0 bar | |
| Stabilized salt rejection | 99.5% | |
| pH range continuous operation | 3-10 | |
| pH range short term cleaning | 1-12 | |