The disinfection efficiencies of a commercial mixture of peracetic acid against Escherichia coli were studied in laboratory scale experiments. The joint and separate action of two disinfectant agents, hydrogen peroxide and peracetic acid, were evaluated in order to observe synergistic effects. A kinetic model for each component of the mixture and for the commercial mixture was proposed. Through simple mathematical equations, the model describes different stages of attack by disinfectants during the inactivation process. Based on the experiments and the kinetic parameters obtained, it could be established that the efficiency of hydrogen peroxide was much lower than that of peracetic acid alone. However, the contribution of hydrogen peroxide was very important in the commercial mixture. It should be noted that this improvement occurred only after peracetic acid had initiated the attack on the cell. This synergistic effect was successfully explained by the proposed scheme and was verified by experimental results. Besides providing a clearer mechanistic understanding of water disinfection, such models may improve our ability to design reactors.
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Research Article|
September 22 2015
Kinetic model of water disinfection using peracetic acid including synergistic effects
Marina J. Flores;
Marina J. Flores
1INTEC (UNL-CONICET), Güemes 3450, (3000) Santa Fe, Argentina
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Rodolfo J. Brandi;
Rodolfo J. Brandi
1INTEC (UNL-CONICET), Güemes 3450, (3000) Santa Fe, Argentina
2FICH (UNL), Ciudad Universitaria, Paraje El Pozo, (3000) Santa Fe, Argentina
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Alberto E. Cassano;
Alberto E. Cassano
1INTEC (UNL-CONICET), Güemes 3450, (3000) Santa Fe, Argentina
2FICH (UNL), Ciudad Universitaria, Paraje El Pozo, (3000) Santa Fe, Argentina
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Marisol D. Labas
1INTEC (UNL-CONICET), Güemes 3450, (3000) Santa Fe, Argentina
2FICH (UNL), Ciudad Universitaria, Paraje El Pozo, (3000) Santa Fe, Argentina
E-mail: mlabas@santafe-conicet.gov.ar
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Water Sci Technol (2016) 73 (2): 275–282.
Article history
Received:
July 05 2015
Accepted:
September 09 2015
Citation
Marina J. Flores, Rodolfo J. Brandi, Alberto E. Cassano, Marisol D. Labas; Kinetic model of water disinfection using peracetic acid including synergistic effects. Water Sci Technol 28 January 2016; 73 (2): 275–282. doi: https://doi.org/10.2166/wst.2015.491
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