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Title: Inactivation of pathogenic microorganisms in freshwater using HSO5−/UV-A LED and HSO5−/Mn+/UV-A LED oxidation processes
Authors: Rodriguez-Chueca, Jorge
Silva, Tania
Fernandes, Jose R.
Lucas, Marco S.
Puma, Gianluca
Peres, Jose A.
Sampaio, Ana
Keywords: Peroxymonosulphate
Microorganism inactivation
Kinetic modelling
PMS/Mn+/UV-A LED bacterial inactivation mechanism
Issue Date: 2017
Publisher: © Elsevier
Citation: RODRIGUEZ-CHUECA, J. ... et al, 2017. Inactivation of pathogenic microorganisms in freshwater using HSO5−/UV-A LED and HSO5−/Mn+/UV-A LED oxidation processes. Water Research, 123, pp. 113-123.
Abstract: Freshwater disinfection using photolytic and catalytic activation of peroxymonosulphate (PMS) through PMS/UV-A LED and PMS/Mn+/UV-A LED [Mn+ = Fe2+ or Co2+] processes was evaluated through the inactivation of three different bacteria: Escherichia coli (Gram-negative), Bacillus mycoides (sporulated Gram-positive), Staphylococcus aureus (non-sporulated Gram-positive), and the fungus Candida albicans. Photolytic and catalytic activation of PMS were effective in the total inactivation of the bacteria using 0.1 mM of PMS and Mn+ at neutral pH (6.5), with E. coli reaching the highest and the fastest inactivation yield, followed by S. aureus and B. mycoides. With B. mycoides, the oxidative stress generated through the complexity of PMS/Mn+/UV-A LED combined treatments triggered the formation of endospores. The treatment processes were also effective in the total inactivation of C. albicans, although, due to the ultrastructure, biochemistry and physiology of this yeast, higher dosages of reagents (5 mM of PMS and 2.5 mM of Mn+) were required. The rate of microbial inactivation markedly increased through catalytic activation of PMS particularly during the first 60 s of treatment. Co2+ was more effective than Fe2+ to catalyse PMS decomposition to sulphate radicals for the inactivation of S. aureus and C. albicans. The inactivation of the four microorganisms was well represented by the Hom model. The Biphasic and the Double Weibull models, which are based on the existence of two microbial sub-populations exhibiting different resistance to the treatments, also fitted the experimental results of photolytic activation of PMS.
Description: This paper was accepted for publication in the journal Water Research and the definitive published version is available at http://dx.doi.org/10.1016/j.watres.2017.06.021
Sponsor: The authors are grateful to European Investment Funds by FEDER/COMPETE/POCI (POCI-01-0145-FEDER-006958) and National Funds by FCT under the projects UID/AGR/04033/2013 and UID/QUI/00616/2013. Project INNOFOOD - INNOvation in the FOOD sector through the valorization of food and agro-food by-products -NORTE-07-0124-FEDER-0000029, Project INTERACT e Integrative Research in Environment, Agro-Chains and Technology - NORTE- 01-0145-FEDER-000017 and Project INNOVINE & WINE - Innovation Platform of Vine and Wine - NORTE-01-0145-FEDER-000038. Jorge Rodriguez-Chueca also acknowledges the funding provided by the Spanish Ministry of Economy and Competitiveness (MINECO) through the Juan de la Cierva-formacion grant (No FJCI- (2014-20195). Marco S. Lucas also acknowledges the funding provided by the European Union's Horizon 2020 research and innovation programme under the Marie Sklodowska-Curie grant agreement No 660969.
Version: Accepted for publication
DOI: 10.1016/j.watres.2017.06.021
URI: https://dspace.lboro.ac.uk/2134/25909
Publisher Link: http://dx.doi.org/10.1016/j.watres.2017.06.021
ISSN: 0043-1354
Appears in Collections:Published Articles (Chemical Engineering)

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