Figure 3: Permeate flux decline with time (a) at four different feed pressures of 10 bar (○), 15 bar (σ), 20 bar (≤), and 30 bar (◊) for X20 membrane (Test conditions employed were suspended solid concentration : 1,072 mg/L, crossflow velocity : 2.0 m/s, temperature : 25 ± 1°C, and pH : 7.3 ± 0.2) (b) at three different feed temperatures 25°C (○), 30°C (σ), and 35°C (≤) for X20 membrane (Test conditions employed were suspended solid concentration : 1,072 mg/L, cross-flow velocity : 2.0 m/s, P :10 bar and pH : 7.3 ± 0.2).