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RISS 인기검색어
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- 저자 : Imminger, Stefanie (검색결과 1 건)
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Lee, Yunho,Imminger, Stefanie,Czekalski, Nadine,von Gunten, Urs,Hammes, Frederik Elsevier 2016 Water research Vol.101 No.-
<P><B>Abstract</B></P> <P>Inactivation kinetics of autochthonous bacteria during ozonation of wastewater effluents were investigated using cultivation-independent flow cytometry (FCM) with total cell count (TCC) and intact cell count (ICC) and intracellular adenosine triphosphate (ATP) analysis. The principles of the methods including ozone inactivation kinetics were demonstrated with laboratory-cultured <I>Escherichia coli</I> spiked into filtered and sterilized wastewater effluent. Both intracellular ATP and ICC decreased with increasing ozone doses, with ICC being the more conservative parameter. The log-inactivation levels (−log(N/N<SUB>0</SUB>) of <I>E. coli</I> reached the method detection limits for FCM (∼3) and ATP (∼1.7) at specific ozone doses of ≥0.5 gO<SUB>3</SUB>/gDOC. During ozonation of four real wastewater effluents, the log-inactivation of autochthonous bacteria with FCM ICC was 0.3–1.0 for 0.25 gO<SUB>3</SUB>/gDOC and increased to 1.1–2.1 for 0.5 gO<SUB>3</SUB>/gDOC, but remained at a similar level of 1.5–2.8 for a further increase of the specific ozone doses to 1.0 and 1.5 gO<SUB>3</SUB>/gDOC. The FCM data also showed that autochthonous bacteria were composed of communities with high and low ozone reactivity. The inactivation levels measured with intracellular ATP were reasonably correlated to ICC (r<SUP>2</SUP> = 0.8). Overall, FCM and ATP measurements were demonstrated to be useful tools to monitor the inactivation of autochthonous bacteria during ozonation of municipal wastewater effluents.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Ozone inactivation kinetics of wastewater effluent studied by FCM, ATP and cultivation. </LI> <LI> For <I>E. coli</I>, inactivation was in order of cultivation, ATP, and FCM-ICC. </LI> <LI> FCM and ATP were useful for measuring inactivation of autochthonous wastewater bacteria. </LI> <LI> 0.5 gO<SUB>3</SUB>/gDOC resulted in over 99% decrease of cell viability by FCM and ATP analysis. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>
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