Evaluation of different shape parameters to distinguish between flocs and filaments in activated sludge images

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 c...

Full description

Saved in:
Bibliographic Details
Published in:Water science and technology 2002-01, Vol.45 (4-5), p.85-91
Main Authors: CENENS, C, JENNE, R, VAN IMPE, J. F
Format: Article
Language:English
Subjects:
Activated sludge
Activated Sludge Process
Applied sciences
Aspect ratio
Biological and medical sciences
Biological treatment of waters
Biomass
Biotechnology
Environment and pollution
Evaluation
Exact sciences and technology
Filaments
Flocculation
Fractals
Fundamental and applied biological sciences. Psychology
General purification processes
Gyration
Image analysis
Image classification
Image processing
Image Processing, Computer-Assisted
Industrial applications and implications. Economical aspects
Parameters
Particle Size
Pollution
Roundness
Sewage - chemistry
Shape
Sludge
Wastewater
Wastewater treatment
Wastewater treatment plants
Wastewaters
Water Microbiology
Water Purification - methods
Water Purification - standards
Water treatment
Water treatment and pollution
Water treatment plants
Citations: Items that cite this one
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary: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
1996-9732
DOI:10.2166/wst.2002.0558