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Title: Evaluation of different shape parameters to distinguish between flocs and filaments in activated sludge images
Authors: Cenens, C ×
Jenné, R
Van Impe, Jan #
Issue Date: 2002
Publisher: I W A PUBLISHING
Series Title: Water science and technology vol:45 issue:4-5 pages:85-91
Conference: date:Katholieke Univ Leuven, Dept Food & Microbial Technol, BioTeC, B-3001 Heverlee, Belgium
Abstract: The ratio of flocs to filaments in activated sludge waste water treatment plants is of extreme importance for the overall performance of the plant. In order to control this ratio the individual concentrations of flocs and filaments need to be measurable. However, no sensors which can measure these concentrations are currently available. It is proposed that by means of image analysis techniques the ratio of flocs to filaments can be determined. Combination of this ratio with the total biomass concentration results in the individual floc and filament concentration. This contribution focuses on the last step of the image analysis procedure, i.e., the classification of objects as either floc or filament. Five different shape parameters, i.e., aspect ratio, roundness, form factor, fractal dimension and reduced radius of gyration, are evaluated and compared. The results indicate that the form factor is the least suitable and the reduced radius of gyration the most suitable shape parameter to accurately classify flocs and filaments in activated sludge images.
ISSN: 0273-1223
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Bio- & Chemical Systems Technology, Reactor Engineering and Safety Section
× corresponding author
# (joint) last author

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