State Key Laboratory of Pollution Control and Resource Reuse, Nanjing University, Nanjing 210093, China.
J Environ Sci (China). 2009;21(12):1639-45. doi: 10.1016/s1001-0742(08)62467-5.
The process of using flat-sheet membrane for simultaneous sludge thickening and digestion (MSTD) was employed. The variations of sludge concentration and rheology were characterized and simulated. Based on mass balance analysis, mathematical models were developed and successfully used to predict and evaluate the variations of sludge concentration and the digestion efficiency in the MSTD process. The apparent viscosity of sludge could be modeled as functions of mixed liquor suspended solids and shear rates. The sludge in the MSTD process showed both shear-thinning and viscoplastic behaviour, and under various shear rates different rheological models could be chosen to predict their flow behaviour. It was also found that sludge concentration and viscosity had significant correlations with membrane fouling in the MSTD process.
采用平板膜进行同步污泥浓缩和消化（MSTD）的方法。分析并模拟了污泥浓度和流变性的变化。基于质量平衡分析，建立了数学模型，成功地用于预测和评价 MSTD 过程中污泥浓度和消化效率的变化。污泥的表观黏度可以表示为混合液悬浮固体和剪切速率的函数。MSTD 过程中的污泥表现出剪切稀化和黏塑行为，在不同的剪切速率下，可以选择不同的流变模型来预测其流动行为。还发现，污泥浓度和黏度与 MSTD 过程中的膜污染有显著的相关性。
