Extracellular polymeric substances (EPSs) in activated sludge suspensions are the key substances leading to the membrane fouling. In order to understand the effect of EPSs on the membrane fouling, the actual EPSs solution extracted from activated sludge suspensions was used as the feed solution to conduct dead-end microfiltration experiment under different pressures by using different membranes. The flux (J), fouling resistances (R_m, R_p, R_c and R_total ) and the available membrane area (A/A₀ ) were used to describe the membrane fouling. The results showed that with the increase of pressure, J and R_total increased. R_p firstly increased and then kept constant, R_c always increased and became the dominant resistance. A/A₀ decreased from 1 to a constant. R_c plays a key role on R_total for different membranes under the same pressure. The sequence of the steady available membrane area (A _steady/A₀ ) for different pressures was: 63.0% (0.05MPa)> 56.5% (0.08MPa)> 53.6% (0.10MPa), and that for different membranes was: 80.1% (0.2μm PES) > 79.9% (0.1μm PES) > 78.4% (0.1μm PAN) > 53.6% (0.1μm PVDF).

活性污泥悬浮液中的细胞外聚合物（EPS）是导致膜污染的关键物质。为了了解EPSs对膜污染的影响，以从活性污泥悬浮液中提取的实际EPSs溶液作为进料溶液，使用不同的膜在不同压力下进行死端微滤实验。通量（J）、污染阻力（R _m、R _p、R _c 和R _total ）和可用膜面积（A/A ₀ ）用于描述膜污染。结果表明，随着压力的增加，J和R_总量 增加。R _p 先增大后保持不变， R _c 始终增大并成为主导电阻。A/A ₀ 从 1 减少到一个常数。R _c 在相同压力下对不同膜的_总R 起关键作用不同压力下稳定可用膜面积（ A _稳定/ A ₀ ）的顺序为：63.0%（0.05MPa）>56.5%（0.08MPa）>53.6%（0.10MPa），不同膜的可用面积为：80.1% (0.2μm PES) > 79.9% (0.1μm PES) > 78.4% (0.1μm PAN) > 53.6% (0.1μm PVDF)。