On the modelling of the dynamic propagation of biological components in the secondary clarifier
Author
Summary, in English
When coupling a model of the biological reactor to a model of the settler, difficulties appear because of the different representations used for the particulate material. A combined model of the entire activated sludge process needs to include an algorithm for the dynamic propagation of the biological components of the particulate material through the secondary clarifier. In particular, this is of importance for an accurate description of the sludge that is recycled to the biological reactor. Two one-dimensional algorithms have been evaluated by means of numerical simulations. The first algorithm investigated is the one by Otterpohl and Freund in 1992 and some inherent problems of this method are discussed. For example, it will produce oscillating solutions as the number of layers in the settler model increases. Therefore, an alternative algorithm is proposed. It is based on a percentage vector that describes the different particulate biological components as fractions of the total suspended solids concentration. The vector is updated for every layer in the settler model by a robust numerical method. The algorithm is derived analytically, is computationally efficient and does not exhibit any oscillatory behaviour.
Department/s
- Industrial Electrical Engineering and Automation
- Mathematics (Faculty of Engineering)
- Partial differential equations
- Numerical Analysis
Publishing year
1996
Language
English
Pages
85-92
Publication/Series
Water Science and Technology
Volume
34
Issue
5
Links
Document type
Journal article
Publisher
IWA Publishing
Topic
- Mathematics
- Other Electrical Engineering, Electronic Engineering, Information Engineering
- Computational Mathematics
- Water Engineering
- Water Treatment
- Chemical Engineering
Keywords
- thickening
- suspended solids
- solids flux
- simulation
- secondary clarifier
- one-dimensional model
- mathematical modelling
- clarification
- Activated sludge
Status
Published
Research group
- Partial differential equations
- Numerical Analysis
ISBN/ISSN/Other
- ISSN: 0273-1223