MS2 coliphage inactivation by Al/Fe PILC-activated Catalytic Wet Peroxide Oxidation: multiresponse statistical optimization

The optimization of the Catalytic Wet Peroxide Oxidation (CWPO) assisted by an Al/Fe-pillared clay (Al/Fe-PILC) was assessed in the inactivation of the MS2 coliphage in the presence of a synthetic surrogate of natural organic matter (NOM). The simultaneous effect of two experimental factors (i) H2O2...

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Bibliographic Details
Published in:Heliyon 2019-06, Vol.5 (6), p.e01892-e01892, Article e01892
Main Authors: Ordoñez-Ordoñez, Alejandra, Revelo-Romo, Dolly M., Garcia-Mora, Ana M., Hidalgo-Troya, Arsenio, Galeano, Luis-Alejandro
Format: Article
Language:English
Subjects:
Al/Fe-pillared clay
Analytical chemistry
Applied chemistry
Applied microbiology
CWPO
Drinking water quality
Environmental chemistry processes
Environmental science
Environmental technology
Materials chemistry
Microbiology
MS2 coliphage
Nanotechnology
Natural hazards
Response surface methodology
Statistical optimization
Water disinfection
Water pollution treatment
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Summary:The optimization of the Catalytic Wet Peroxide Oxidation (CWPO) assisted by an Al/Fe-pillared clay (Al/Fe-PILC) was assessed in the inactivation of the MS2 coliphage in the presence of a synthetic surrogate of natural organic matter (NOM). The simultaneous effect of two experimental factors (i) H2O2 dose - (H2O2)d (3.00–25.50 % of the H2O2 theoretically required for full mineralization) and (ii) catalyst concentration (0.33–2.60 g/L), and four non-controllable variables (covariates) (a) circumneutral pH (6.00–9.00), (b) temperature (5.00–25.0 °C), (c) synthetic NOM concentration (2.0–20.0 mg C/L) and (d) MS2 titer (104, 105 and 106 PFU/mL) was investigated by Response Surface Methodology (RSM). Every response was modeled and maximized: (1) MS2 inactivation, (2) fraction of reacted H2O2, (3) decolourization and (4) NOM mineralization. Multi-response optimization via desirability function based on responses (1) to (3) achieved excellent fitting (0.94 out of 1.0) and following set of optimal experimental conditions: 0.33 g Al/Fe-PILC/L, 3.36 % (H2O2)d ​(Feactive/H2O2) = 0.46, giving rise to 92.9 % of MS2 inactivation and 100 % of reacted H2O2 at pH 7.07, 25.0 +/- 0.1 °C, 16.06 mg C/L as starting NOM concentration, and MS2 titer of 106 PFU/mL after just 70 min ​of reaction.
ISSN:2405-8440
2405-8440
DOI:10.1016/j.heliyon.2019.e01892