Model to Quantify Removal and Inactivation of Microorganisms Occluded in Effluent Wastewater Particles Using Filtration and Disinfection Systems
Publication: Journal of Environmental Engineering
Volume 136, Issue 10
Abstract
A model is presented to quantify microbial occlusion in effluent particles and improve understanding of the removal and inactivation of occluded microorganisms in filtration and disinfection systems. Microbial occlusion in particles is described in the model as a function of the particle size distribution, the microbial density , which is the average quantity of target microorganisms within the subset of particles that contain microorganisms, and the frequency of association , which is the ratio of particles that contain at least one target microorganism. To demonstrate the model, undisinfected secondary effluent samples were collected from an extended aeration treatment facility and analyzed to determine values for the model variables, and for heterotrophic bacteria and aerobic endospores and for total coliform bacteria. Heterotrophic bacteria were present in most effluent particles (73–100%) at high densities (7–93 per particle), whereas aerobic endospores and total coliform bacteria were only present in a small percentage of effluent particles (0.1–6%) and the density of aerobic endospores in effluent particles was not appreciably higher than one per particle.
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Acknowledgments
This work was funded by the Water Environment Research Foundation, Project No. UNSPECIFIED04-HHE-5. All opinions, findings, conclusions, and recommendations expressed herein are entirely those of the writers and do not necessarily reflect the views of the funding agency.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 136 • Issue 10 • October 2010
Pages: 1153 - 1160
Copyright
© 2010 ASCE.
History
Received: Nov 14, 2009
Accepted: Feb 3, 2010
Published online: Feb 8, 2010
Published in print: Oct 2010
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