Effects of aeration patterns on the flow field in wastewater aeration tanks

被引：62
作者：
Gresch, Markus [1 ,2 ]
Armbruster, Martin [3 ]
Braun, Daniel [2 ]
Gujer, Willi [1 ,2 ]
机构：
[1] Eawag, Swiss Fed Inst Aquat Sci & Technol, CH-8600 Dubendorf, Switzerland
[2] Swiss Fed Inst Technol, Inst Environm Engn, CH-8093 Zurich, Switzerland
[3] Hydrograv GmbH, D-01069 Dresden, Germany
来源：
WATER RESEARCH | 2011年 / 45卷 / 02期
基金：
瑞士国家科学基金会;
关键词：
Activated sludge process; Aeration; Ammonium; CFD; Reactor hydraulics; Reactive tracer; COMPUTATIONAL FLUID-DYNAMICS; OXYGEN-TRANSFER; BUBBLE-COLUMN; CFD SIMULATION; DIFFUSED AIR; CLEAN WATER; TURBULENCE; BEHAVIOR; OPTIMIZATION; REACTOR;
D O I：
10.1016/j.watres.2010.09.009
中图分类号：
X [环境科学、安全科学];
学科分类号：
08 ; 0830 ;
摘要：
Due to the high energy input of aeration, the spatial distribution of air diffusers largely determines the flow field in aeration tanks. This has consequences on the efficiency of the aeration system, the performance of the aeration tank and on tank operation and control. This paper deals with these effects applying both Computational Fluid Dynamics (CFD) enhanced with a biokinetic model and full scale validation using velocity and reactive tracer measurements with high temporal and spatial resolution. It is shown that small changes in the diffuser arrangement drastically change the overall flow field. Using different aeration patterns in the same tank may lead to large scale instabilities in the flow field that lower plant performance and produce strong variations in concentration signals impeding their use for plant control. CFD is a valuable tool to analyze the interaction of flow field and aeration and their effects on plant performance and operation. But, in complex flow situations experimental validation is needed and strongly suggested. (C) 2010 Elsevier Ltd. All rights reserved.
引用
收藏
页码：810 / 818
页数：9
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