The paper summarizes the results of a bench-scale study to evaluate the long-term disinfection efficiency of peracetic acid (PAA). Bacterial counts were repeated 5, 24, and 29 h after the end of the disinfection test, to simulate real re-growth conditions (no residual quenching) and, for the 5 h interval, the potential re-growth (quenching of residual PAA). Fecal coliforms, Escherichia coli, and total heterotrophic bacteria (THB) were enumerated by traditional plate count technique; THB were also enumerated by cytometry. After disinfection, the residual PAA concentration became negligible in about 5 to 11 h, depending on the tested doses. Microbial counts showed that no appreciable re-growth took place after 29 h for coliform group bacteria. For THB, the previously cited enumeration techniques gave different results in re-growth tests, especially for the lowest PAA doses. Indeed plate count technique evaluates the ability to form colonies, while cytometry enumerates intact membrane cells. No re-growth took place, even when no residual disinfectant was present, suggesting that bacteria are unable, even at the lowest doses, to repair damage caused by the PAA disinfecting action. PAA was found to be an efficient disinfecting agent, not only as a bacteriostatic, but also as a bactericide. © 2006 American Chemical Society.

Antonelli, M., Rossi, S., Mezzanotte, V., Nurizzo, C. (2006). Secondary effluent disinfection: PAA long term efficiency. ENVIRONMENTAL SCIENCE & TECHNOLOGY, 40(15), 4771-4775 [10.1021/es060273f].

Secondary effluent disinfection: PAA long term efficiency

MEZZANOTTE, VALERIA FEDERICA MARIA;
2006

Abstract

The paper summarizes the results of a bench-scale study to evaluate the long-term disinfection efficiency of peracetic acid (PAA). Bacterial counts were repeated 5, 24, and 29 h after the end of the disinfection test, to simulate real re-growth conditions (no residual quenching) and, for the 5 h interval, the potential re-growth (quenching of residual PAA). Fecal coliforms, Escherichia coli, and total heterotrophic bacteria (THB) were enumerated by traditional plate count technique; THB were also enumerated by cytometry. After disinfection, the residual PAA concentration became negligible in about 5 to 11 h, depending on the tested doses. Microbial counts showed that no appreciable re-growth took place after 29 h for coliform group bacteria. For THB, the previously cited enumeration techniques gave different results in re-growth tests, especially for the lowest PAA doses. Indeed plate count technique evaluates the ability to form colonies, while cytometry enumerates intact membrane cells. No re-growth took place, even when no residual disinfectant was present, suggesting that bacteria are unable, even at the lowest doses, to repair damage caused by the PAA disinfecting action. PAA was found to be an efficient disinfecting agent, not only as a bacteriostatic, but also as a bactericide. © 2006 American Chemical Society.
Articolo in rivista - Articolo scientifico
disinfection; bacterial re-growth; peracetic acid
English
2006
40
15
4771
4775
none
Antonelli, M., Rossi, S., Mezzanotte, V., Nurizzo, C. (2006). Secondary effluent disinfection: PAA long term efficiency. ENVIRONMENTAL SCIENCE & TECHNOLOGY, 40(15), 4771-4775 [10.1021/es060273f].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/1712
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