Modelling the effect of shear history on activated sludge flocculation

被引：19

作者：

Biggs, C

Lant, P

Hounslow, M

机构：

[1] Univ Sheffield, Dept Chem & Proc Engn, Sheffield S1 3JD, S Yorkshire, England

[2] Univ Queensland, Dept Chem Engn, AWMC, St Lucia, Qld 4072, Australia

来源：

WATER SCIENCE AND TECHNOLOGY | 2003年 / 47卷 / 11期

关键词：

activated sludge flocs; aggregation; breakage; population balances; shear history;

D O I：

10.2166/wst.2003.0612

中图分类号：

X [环境科学、安全科学];

学科分类号：

08 ; 0830 ;

摘要：

The aim of this paper is to investigate the effect of shear history on activated sludge flocculation dynamics and to model the observed relationships using population balances. Activated sludge flocs are exposed to dramatic changes in the shear rate within the treatment process, as they pass through localised high and low mixing intensities within the aeration basin and are cycled through the different unit operations of the treatment process. We will show that shear history is a key factor in determining floc size, and that the floc size varies irreversibly with changes in shear rate. A population balance model of the flocculation process is also introduced and evaluated.

引用

页码：251 / 257

页数：7

共 12 条

[1] Activated sludge flocculation: On-line determination of floc size and the effect of shear [J].