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DC Field | Value | Language |
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dc.contributor.author | Mecha, Achisa C. | - |
dc.contributor.author | Onyango, Maurice S. | - |
dc.contributor.author | Ochieng, Aoyi | - |
dc.contributor.author | Momba, Maggy N. B. | - |
dc.date.accessioned | 2021-08-10T11:42:17Z | - |
dc.date.available | 2021-08-10T11:42:17Z | - |
dc.date.issued | 2019 | - |
dc.identifier.uri | https://doi.org/10.4491/eer.2019.432 | - |
dc.identifier.uri | http://ir.mu.ac.ke:8080/jspui/handle/123456789/5000 | - |
dc.description.abstract | Microbial water pollution is a key concern leading to waterborne diseases. This study evaluated the disinfection of wastewater using ozonation. The following aspects were investigated: inactivation efficiency against Escherichia coli, Salmonella species, Shigella species, and Vibrio cholerae; modelling of inactivation kinetics using disinfection models; and evaluation of microbial regrowth studies. 99% bacterial inactivation was obtained within 15 min, irrespective of the water matrix, showing the strong oxidizing potential of ozone. The disinfection data were fitted into the log-linear and Weibull models. The survival curves were non-linear and fitted the Weibull model (fractional bias and normalized mean square error equal to 0.0), especially at high bacterial concentrations (106 CFU/mL). The inactivation occurred in two stages: an initial rapid stage (15 min) and a final slow stage exhibiting a tailing mechanism (15-45 min) probably as a result of the self-defence mechanisms adopted by the bacteria to limit oxidative stress. Considering the pattern of survival curves, no significant differences (p> 0.05) were observed among the four tested bacterial species; thus showing that ozone was effective against all the bacteria tested. There was minimal bacterial regrowth in the treated samples 24 h after ozone disinfection with reactivation values of 0-5% obtained. | en_US |
dc.language.iso | en | en_US |
dc.publisher | Korean Society of Environmental Engineers | en_US |
dc.subject | Water pollution | en_US |
dc.subject | Water Treatment | en_US |
dc.title | Modelling inactivation kinetics of waterborne pathogens in municipal wastewater using ozone | en_US |
dc.type | Article | en_US |
Appears in Collections: | School of Engineering |
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