Optimising activated sludge growth rate by intensifying hydrodynamic forces
✍ Scribed by G M Evans; G Liu
- Book ID
- 102325675
- Publisher
- Wiley (John Wiley & Sons)
- Year
- 2003
- Tongue
- English
- Weight
- 149 KB
- Volume
- 78
- Category
- Article
- ISSN
- 0268-2575
- DOI
- 10.1002/jctb.769
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✦ Synopsis
Abstract
In this study a Couette device was used to examine the influence of hydrodynamic forces on the overall behaviour of activated sludge. The specific growth rate of activated sludge increased with increasing specific energy dissipation rate, reaching a maximum rate at an energy input of approximately 40 m^2^ s^−3^, beyond which any further increases resulted in a reduction in the overall growth. At levels above about 250 m^2^ s^−3^ the specific growth rate was negligible. Experimental growth rates in the range 0.04–0.20 h^−1^ were obtained, depending on the energy input levels and substrate (glucose) concentration. A theoretical model successfully predicted both the decrease in the floc radius and microbial activity with increasing energy input into the system, and when combined was able to provide a reasonable prediction for the optimum specific energy dissipation rate to maximise the specific growth rate.
© 2003 Society of Chemical Industry