Model to Quantify Removal and Inactivation of Microorganisms Occluded in Effluent Wastewater Particles Using Filtration and Disinfection Systems |
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| Authors: | Mary Kay Camarillo Frank J Loge Jeannie L Darby |
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| Affiliation: | 1Assistant Professor, Dept. of Civil Engineering, Univ. of the Pacific, 3601 Pacific Ave., Stockton, CA 95211 (corresponding author). E-mail: mcamarillo@pacific.edu
2Professor, Dept. of Civil and Environmental Engineering, Univ. of California–Davis, 1 Shields Ave., Davis, CA 95616.
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| 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 (N1), which is the average quantity of target microorganisms within the subset of particles that contain microorganisms, and the frequency of association (N2), 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, N1 and N2 for heterotrophic bacteria and aerobic endospores and N2 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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| Keywords: | Waste treatment Bacteria Particles Filters Disinfection Waste management |
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