Microbial populations were studied by plate counts and flow cytometry along the polishing sequence of a wastewater plant. The comparison between plate count and flow cytometry showed comparable trends, but plate counts detected less than 10% of the total intact bacteria counted by flow cytometry. Six months monitoring showed that, in spite of the high ozone doses, the disinfection effect of ozonation was insignificant. This is in agreement with the variability of ozone demand, not only related to chemical oxygen demand or total suspended solids. Membrane-intact bacterial population decreased after ozonation, slightly regrew between ozone and biological activated carbon (BAC), and sharply increased after BAC, probably for damaged bacteria regrowth and saprophytes release; BAC effluent had the highest bacterial counts. Preliminary investigations on the effluent microbial composition showed that the beta Proteobacteria subclass is the most represented in the BAC effluent, whereas the alpha subclass is the most sensitive to ozone effect

Mezzanotte, V., Ghiani, A., Sgorbati, S., Citterio, S. (2004). Analysis of microbiological characteristics of wastewater along the polishing sequence of a treatment plant. WATER ENVIRONMENT RESEARCH, 76(5), 463-467 [10.2175/106143004X151545].

Analysis of microbiological characteristics of wastewater along the polishing sequence of a treatment plant

MEZZANOTTE, VALERIA FEDERICA MARIA;SGORBATI, SERGIO;CITTERIO, SANDRA
2004

Abstract

Microbial populations were studied by plate counts and flow cytometry along the polishing sequence of a wastewater plant. The comparison between plate count and flow cytometry showed comparable trends, but plate counts detected less than 10% of the total intact bacteria counted by flow cytometry. Six months monitoring showed that, in spite of the high ozone doses, the disinfection effect of ozonation was insignificant. This is in agreement with the variability of ozone demand, not only related to chemical oxygen demand or total suspended solids. Membrane-intact bacterial population decreased after ozonation, slightly regrew between ozone and biological activated carbon (BAC), and sharply increased after BAC, probably for damaged bacteria regrowth and saprophytes release; BAC effluent had the highest bacterial counts. Preliminary investigations on the effluent microbial composition showed that the beta Proteobacteria subclass is the most represented in the BAC effluent, whereas the alpha subclass is the most sensitive to ozone effect
Articolo in rivista - Articolo scientifico
ozonation, biological activated carbon,flow cytometry, fluorescence microscopy, plate count
English
2004
76
5
463
467
none
Mezzanotte, V., Ghiani, A., Sgorbati, S., Citterio, S. (2004). Analysis of microbiological characteristics of wastewater along the polishing sequence of a treatment plant. WATER ENVIRONMENT RESEARCH, 76(5), 463-467 [10.2175/106143004X151545].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/1717
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