Guo Lisha, Zhang Daijun, Xu Danyu, Chen Yuan
Department of Environmental Science, Chongqing University, Chongqing, China.
Water Res. 2009 May;43(9):2383-90. doi: 10.1016/j.watres.2009.02.032. Epub 2009 Mar 5.
Particle Image Velocimetry (PIV) was used to study the settling of activated sludge flocs under turbulent flow conditions. Experimental results showed that a larger particle diameter led to a higher settling velocity while the higher turbulence intensity led to lower settling velocity. Based on the measurements a mathematical relation has been derived which correlates the settling velocity for individual sludge flocs under turbulent conditions through a modified Vesilind equation. Settling velocity shows a power-type relation to sludge particle diameter and an exponential-type relation with turbulence intensity and sludge concentration.
粒子图像测速技术（PIV）被用于研究湍流条件下活性污泥絮体的沉降。实验结果表明，较大的粒径导致较高的沉降速度，而较高的湍流强度导致较低的沉降速度。基于这些测量结果，通过修正的维西林德方程推导得出了一个数学关系式，该关系式将湍流条件下单个污泥絮体的沉降速度关联起来。沉降速度与污泥粒径呈幂次型关系，与湍流强度和污泥浓度呈指数型关系。
