Segmentation assessment of activated sludge flocs at different magnifications for wastewater treatment

Activated sludge process form an important part of wastewater treatment plant with domestic effluent. The variations in the state of the process are appeared as those in the size and structure of flocs and filaments found in the wastewater samples from aeration tank of secondary treatment. The norma...

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Main Authors: Khan, M.B., Nisar, H., Ng, C.A., Salih, Y., Malik, A.S.
Format: Conference or Workshop Item
Published: Institute of Electrical and Electronics Engineers Inc. 2014
Online Access:https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946688775&doi=10.1109%2fICCSCE.2014.7072787&partnerID=40&md5=fd969930797443c7d690a76864e84753
http://eprints.utp.edu.my/31303/
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spelling my.utp.eprints.313032022-03-25T09:05:39Z Segmentation assessment of activated sludge flocs at different magnifications for wastewater treatment Khan, M.B. Nisar, H. Ng, C.A. Salih, Y. Malik, A.S. Activated sludge process form an important part of wastewater treatment plant with domestic effluent. The variations in the state of the process are appeared as those in the size and structure of flocs and filaments found in the wastewater samples from aeration tank of secondary treatment. The normal operation requires proper settling of flocs in the secondary clarifier, which is affected by problem of bulking and pin point flocs. Conventional physico-chemical methods take a lot of time to detect the abnormal operation, consequently leaving insufficient time for precautionary measures. Image processing and analysis of microscopic images can offer a time-efficient alternative to monitor the operation of activated sludge process. Segmentation is a necessary part of image processing and analysis for identification of regions of interest in the image, and its acceptable accuracy is pre-requisite of the morphological analysis. In this paper, three segmentation techniques, fuzzy cmeans, k-means and Otsu thresholding, were used to segment flocs in microscopic images of samples taken from aeration tank of activated sludge process. The performance of the segmentation algorithms was evaluated for images taken at four different objective magnifications of microscope, using metrics of global consistency error (GCE), random index (RI) and variation of information (VI). The performance metrics were evaluated by comparing the segmented images with the approximation of ground truth images. Finally, the effect of magnification was investigated on the image segmentation and analysis procedure and observed that the size of floc, perceptible to the image segmentation and analysis procedure is greater and more precise at higher magnification. © 2014 IEEE. Institute of Electrical and Electronics Engineers Inc. 2014 Conference or Workshop Item NonPeerReviewed https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946688775&doi=10.1109%2fICCSCE.2014.7072787&partnerID=40&md5=fd969930797443c7d690a76864e84753 Khan, M.B. and Nisar, H. and Ng, C.A. and Salih, Y. and Malik, A.S. (2014) Segmentation assessment of activated sludge flocs at different magnifications for wastewater treatment. In: UNSPECIFIED. http://eprints.utp.edu.my/31303/
institution Universiti Teknologi Petronas
building UTP Resource Centre
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Teknologi Petronas
content_source UTP Institutional Repository
url_provider http://eprints.utp.edu.my/
description Activated sludge process form an important part of wastewater treatment plant with domestic effluent. The variations in the state of the process are appeared as those in the size and structure of flocs and filaments found in the wastewater samples from aeration tank of secondary treatment. The normal operation requires proper settling of flocs in the secondary clarifier, which is affected by problem of bulking and pin point flocs. Conventional physico-chemical methods take a lot of time to detect the abnormal operation, consequently leaving insufficient time for precautionary measures. Image processing and analysis of microscopic images can offer a time-efficient alternative to monitor the operation of activated sludge process. Segmentation is a necessary part of image processing and analysis for identification of regions of interest in the image, and its acceptable accuracy is pre-requisite of the morphological analysis. In this paper, three segmentation techniques, fuzzy cmeans, k-means and Otsu thresholding, were used to segment flocs in microscopic images of samples taken from aeration tank of activated sludge process. The performance of the segmentation algorithms was evaluated for images taken at four different objective magnifications of microscope, using metrics of global consistency error (GCE), random index (RI) and variation of information (VI). The performance metrics were evaluated by comparing the segmented images with the approximation of ground truth images. Finally, the effect of magnification was investigated on the image segmentation and analysis procedure and observed that the size of floc, perceptible to the image segmentation and analysis procedure is greater and more precise at higher magnification. © 2014 IEEE.
format Conference or Workshop Item
author Khan, M.B.
Nisar, H.
Ng, C.A.
Salih, Y.
Malik, A.S.
spellingShingle Khan, M.B.
Nisar, H.
Ng, C.A.
Salih, Y.
Malik, A.S.
Segmentation assessment of activated sludge flocs at different magnifications for wastewater treatment
author_facet Khan, M.B.
Nisar, H.
Ng, C.A.
Salih, Y.
Malik, A.S.
author_sort Khan, M.B.
title Segmentation assessment of activated sludge flocs at different magnifications for wastewater treatment
title_short Segmentation assessment of activated sludge flocs at different magnifications for wastewater treatment
title_full Segmentation assessment of activated sludge flocs at different magnifications for wastewater treatment
title_fullStr Segmentation assessment of activated sludge flocs at different magnifications for wastewater treatment
title_full_unstemmed Segmentation assessment of activated sludge flocs at different magnifications for wastewater treatment
title_sort segmentation assessment of activated sludge flocs at different magnifications for wastewater treatment
publisher Institute of Electrical and Electronics Engineers Inc.
publishDate 2014
url https://www.scopus.com/inward/record.uri?eid=2-s2.0-84946688775&doi=10.1109%2fICCSCE.2014.7072787&partnerID=40&md5=fd969930797443c7d690a76864e84753
http://eprints.utp.edu.my/31303/
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