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Title: Assessing activated sludge morphology by laser and image analysis
Authors: Wu, Jun
Wheatley, Andrew D.
Keywords: Pollution
Sewage treatment
Sewage disposal
Waste management
Waste disposal
Issue Date: 2010
Publisher: © ICE Publishing
Citation: WU, J. and WHEATLEY, A.D., 2010. Assessing activated sludge morphology by laser and image analysis. Proceedings of the Institute of Civil Engineers - Water Management, 163(2), pp.139-145.
Abstract: An excess of filamentous bacteria is a common settlement problem affecting the activated sludge process. In this study activated sludge morphology was monitored by image analysis and laser scattering. These were compared with the conventional sludge volume index. Good correlations between the two optical techniques for floc size were found when the small and interfering particles (< 50 m) were removed from the analysis (activated sludge size 100–500 m). A simpler image analysis procedure was developed using common software and equipment available in most laboratories. This should enable reproducible microbial morphology measurements to be used more widely routinely to predict the onset of poor settlement. The image analysis was used to determine the standard index of filamentinduced poor settlement, namely the total extended filament length. The results in common with some previously noted work did not show a simple link between either floc size or total extended filament length and sludge volume index. A new indicator of excess filaments is suggested, based on the frequency of occurrence of just the long extended filaments (> 100 m) which was shown to give better prediction of poor settlement (bulking).
Description: This article was published in the Proceedings of the ICE - Water Management [© ICE Publishing]. Permission is granted by ICE Publishing to print one copy for personal use. Any other use of these PDF files is subject to reprint fees. The definitive version is available at: http://www.icevirtuallibrary.com/content/article/10.1680/wama.2010.163.3.139
Version: Published
DOI: 10.1680/wama.2010.163.3.139
URI: https://dspace.lboro.ac.uk/2134/15249
Publisher Link: http://dx.doi.org/10.1680/wama.2010.163.3.139
ISSN: 1741-7589
Appears in Collections:Published Articles (Architecture, Building and Civil Engineering)

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