Influence of Turbulence Characteristics on the COD and NH3 N Degradation Capacity of Activated Sludge System
FENG Qian,WANG Chao and WANG Hui
DOI:10.11835/j.issn.1674-4764.2009.02.027
Received ,Revised , Accepted , Available online July 01, 2015
Volume ,2009,Pages 142-147
- Abstract
The distribution of turbulence intensity under different rotation speed was analyzed to seek micro indexes reflecting hydraulic conditions of active sludge system by PIV (Particle Image Velocimetry) in a stirring SBR (Sequencing Batch Reactor). Based on the SBR degradation capacity, flocs structure under different rotating speed of stirring paddle, the influences of turbulence intensity on the degradation capacity were studied, and the indexes of turbulence intensity in the main part of stirring zone and other parts were given. The results show that the specified degradation constant of the pollutants in the active sludge reactor increases firstly and then decreases with the increasing of turbulence intensity. The optimum indexes of turbulence intensity in the experiment are 1.4% of main part and 0.34% of other parts. The turbulence intensity indexes in the active sludge system reflect part differences of hydraulic conditions. The turbulence intensity has remarkable influence on the breaking up of active sludge in the main part of stirring zone, while it has good correlation with the collision and gathering of sludge flocs in other parts of the reactor.