The concentration and purification of oily wastewater were further realized by the reasonable combination of filter membranes with different pore sizes. The initial operating conditions of each combination is shown in Table 1.
Operation conditions of membrane combination
| Membrane combined (μm) . | Operating pressure (MPa) . | Oil condition content (%) . | Outlet velocity (mL/min) . | Material temperature (°C) . |
|---|---|---|---|---|
| 0.22–0.45 | 0.4 | 2 | 200 | 30 |
| 0.22–0.8 | 0.4 | 2 | 200 | |
| 0.45–0.8 | 0.3 | 3 | 250 | |
| 0.22–0.45–0.8 | 0.4 | 2 | 200 |
| Membrane combined (μm) . | Operating pressure (MPa) . | Oil condition content (%) . | Outlet velocity (mL/min) . | Material temperature (°C) . |
|---|---|---|---|---|
| 0.22–0.45 | 0.4 | 2 | 200 | 30 |
| 0.22–0.8 | 0.4 | 2 | 200 | |
| 0.45–0.8 | 0.3 | 3 | 250 | |
| 0.22–0.45–0.8 | 0.4 | 2 | 200 |