Inactivation of pathogenic microorganisms in freshwater using HSO5-/UV-A LED and HSO5-/Mn+/UV-A LED oxidation processes

WATER RESEARCH

卷:123

Article

Rodriguez-Chueca, Jorge^1,2  Silva, Tatiana³  Fernandes, Jose R.^4,5  Lucas, Marco S.^1,6  Puma, Gianluca Li⁶  Peres, Jose A.¹  Sampaio, Ana³ 

[1] UTAD Univ Tras Os Montes & Alto Douro, Dept Quim, Ctr Quim Vila Real, P-5000801 Quinta De Prados, Vila Real, Portugal

[2] Univ Rey Juan Carlos, ESCET, Dept Chem & Environm Technol, C Tulipan S-N, Madrid 28933, Spain

[3] UTAD, CITAB, Dept Biol & Ambiente, P-5000801 Quinta De Prados, Vila Real, Portugal

[4] UTAD Univ Tros Os Montes & Alto Douro, Dept Fis, P-5000801 Quinta De Prados, Vila Real, Portugal

[5] INESC TEC, Rua Campo Alegre 687, P-4169007 Oporto, Portugal

[6] Loughborough Univ, Dept Chem Engn, Environm Nanocatalysis & Photoreact Engn, Loughborough LE11 3TU, Leics, England

关键词: Peroxymonosulphate;    Microorganism inactivation;    UV-A LED;    Kinetic modelling;    PMS/Mn+/UV-A LED bacterial inactivation mechanism;   

DOI  :  10.1016/j.watres.2017.06.021

来源: Elsevier

【 摘 要 】

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 . 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 Horn 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. (C) 2017 Elsevier Ltd. All rights reserved.

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