湍流条件下低浓度污泥沉降速度的实验研究

An experimental study of low concentration sludge settling velocity under turbulent condition.

作者信息

Guo Lisha, Zhang Daijun, Xu Danyu, Chen Yuan

机构信息

Department of Environmental Science, Chongqing University, Chongqing, China.

出版信息

Water Res. 2009 May;43(9):2383-90. doi: 10.1016/j.watres.2009.02.032. Epub 2009 Mar 5.

DOI:10.1016/j.watres.2009.02.032

PMID:19303622

Abstract

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.

摘要

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。