Mu Yang, Yu Han-Qing, Chen Xi-Hua
Laboratory of Environmental Engineering, School of Chemistry, University of Science & Technology of China, Hefei, Anhui 230026, China.
Water Res. 2006 Nov;40(19):3596-602. doi: 10.1016/j.watres.2006.05.041. Epub 2006 Aug 7.
The rheological and fractal characteristics of the granular sludge in an upflow anaerobic sludge blanket (UASB) reactor were investigated in this study. The influences of sludge concentration and temperature on the rheological properties of the granular sludge were evaluated, and the Bingham model was adopted to describe its rheology. In addition, image analysis was used to determine the sludge fractal dimension. The results indicate that the UASB granular sludge showed a shear-thinning behavior. The relationships between the limiting viscosity and the sludge concentration, as well as the limiting viscosity and temperature could be respectively modeled using an exponential equation and Arrhenius equation well. The Bingham model was able to adequately describe the rheology of the granular sludge. The fractal dimension of the granular sludge, 2.79+/-0.03, was larger than that of some other aggregates, suggesting that the granular sludge were more compact and denser. Furthermore, the relationship between rheological and fractal properties of the granular sludge could be properly described with the model proposed by Shih et al. [1990. Scaling behavior of the elastic properties of colloidal. Phys. Rev. A 42, 4772-4779].
本研究对升流式厌氧污泥床（UASB）反应器中颗粒污泥的流变学和分形特征进行了研究。评估了污泥浓度和温度对颗粒污泥流变特性的影响，并采用宾汉模型描述其流变学。此外，利用图像分析确定污泥分形维数。结果表明，UASB颗粒污泥表现出剪切变稀行为。极限粘度与污泥浓度以及极限粘度与温度之间的关系分别可以用指数方程和阿伦尼乌斯方程很好地建模。宾汉模型能够充分描述颗粒污泥的流变学。颗粒污泥的分形维数为2.79±0.03，大于其他一些聚集体的分形维数，表明颗粒污泥更紧凑、更致密。此外，颗粒污泥的流变学和分形特性之间的关系可以用Shih等人[1990年。胶体弹性性质的标度行为。《物理评论A》42，4772 - 4779]提出的模型进行恰当描述。
