中文摘要：

以多生境膜生物反应器运行过程中活性污泥的流变性能为研究对象,考察污泥浓度（MLSS）和剪切速率（γ）对活性污泥流变特性的影响,以期揭示其中活性污泥的流变学特性,从而为优化其运行提供理论及实验基础。反应器系统在不排泥的情况下运行,持续运行105 d,反应器内生物质浓度从刚开始驯化的3 200 mg·L^-1累积到最终的12 500 mg·L^-1。在运行过程中,在常温下同步测定了污泥的动力黏度、极限黏度和上清液黏度。结果表明：随着剪切速率的增大,污泥黏度均减小,表现出剪切稀化的特性,非牛顿流体的特征十分明显;活性污泥极限黏度随MLSS、EPS增加而增大,在低质量浓度（〈8 000 mg·L^-1）下的活性污泥流变特性与Bingham模型十分吻合,而在高质量浓度（〉8 000 mg·L^-1）下的则近似于Ostwald de Vaele模型。

英文摘要：

The present work focused on the rheological properties of activated sludge during the operation of a multi-habitat membrane reactor（ MHMBR）. The effects of mixed liquor suspended solids（ MLSS） and shear rate on the rheological characteristics were investigated to reveal the rheological characteristics of activated sludge in the MHMBR and to provide a theoretical and experimental basis for optimizing the operation of this kind of MBR. The reactor was continuously operated for 105 days without discharging any sludge,which resulted in a large range of sludge concentrations,from the initial 3 200 mg·L^-1to the final 12 500 mg·L^-1. The dynamic and limiting viscosities of the sludge samples as well as the viscosity of the supernatant were measured simultaneously at ambient temperature during the entire operation. Sludge viscosity decreased with increasing shear rate,which indicated shear-thinning and non-Newtonian fluid characteristics. The limiting viscosity had a positive correlation with the concentrations of MLSS and extracellular polymeric substances. Furthermore,the rheological model was studied and the results showed that the rheological properties corresponded well with the Bingham model under lower sludge concentrations（ 8 000 mg·L^-1）. On the other hand,under a higher sludge concentration（ 8 000 mg·L^-1）,there was better agreement with the Ostwald de Vaele model.