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  4. Enhancing solar disinfection of water in PET bottles by optimized in-situ formation of iron oxide films. From heterogeneous to homogeneous action modes with H2O2 vs. O-2 - Part 1: Iron salts as oxide precursors
 
research article

Enhancing solar disinfection of water in PET bottles by optimized in-situ formation of iron oxide films. From heterogeneous to homogeneous action modes with H2O2 vs. O-2 - Part 1: Iron salts as oxide precursors

Shekoohiyan, Sakine
•
Rtimi, Sami  
•
Moussavi, Gholamreza
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February 15, 2019
Chemical Engineering Journal

Solar disinfection (SODIS) is a WHO-accepted intervention method for improving water sources in developing countries. Despite its effectiveness, the limitations of long exposure and bacterial regrowth risk demand further improvement of the practice. In this work, we have generated an iron oxide film on the inner surface of PET bottles used in SODIS, to generate further pathways of solar-mediated inactivation, namely a semiconductor mode of action and controlled iron leaching in the system, which both have demonstrated bactericidal capacity. More specifically, in this Part 1, the deposition process using Fe salts has been scrutinized, assessing the use of various homogeneous Fe precursors (FeCl3 , FeSO4 and Fe-2(SO4)(3)), amounts of iron (0.5-20 g/L) and deposition time (1-8 h) to find the delicate balance among deposition layer thickness and light penetration. At the optimal conditions (4 h deposition, 1 g/L FeCl3 ) SODIS was enhanced, reducing 60% the exposure time; a simple washing step brought a further reduction (70%), while eliminating regrowth in volumes from 330 up to 1500 mL reactors. A robust process and reactor was attained, able to reuse its precursor solution almost 10 times and the reactor in 5 consecutive tests, without the need for re-deposition. The modification also proved to be an invaluable iron source to fuel the photo-Fenton process, when H2O2 as an electron acceptor was added to the system. The improvement induced by the heterogeneous photo-Fenton process was around 80% compared to the SODIS/H2O2 process in plain PET bottles and exceeded 85% when compared to SODIS, while being durable to the high oxidative conditions. Finally, in the view of application in drinking water treatment, the process performed well in the lightly acidic region, due to the physicochemical implications of natural waters' pH in iron cycling.

  • Details
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Type
research article
DOI
10.1016/j.cej.2018.09.219
Web of Science ID

WOS:000450105700021

Author(s)
Shekoohiyan, Sakine
Rtimi, Sami  
Moussavi, Gholamreza
Giannakis, Stefanos  
Pulgarin, Cesar  
Date Issued

2019-02-15

Publisher

ELSEVIER SCIENCE SA

Published in
Chemical Engineering Journal
Volume

358

Start page

211

End page

224

Subjects

Engineering, Environmental

•

Engineering, Chemical

•

Engineering

•

solar disinfection (sodis)

•

semiconductor

•

photo-fenton

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bacterial inactivation

•

iron films

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municipal waste-water

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advanced oxidation processes

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photo-fenton processes

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natural organic-acids

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zero-valent iron

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near-neutral ph

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escherichia-coli

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bacterial inactivation

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photocatalytic disinfection

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aqueous-solution

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
GPAO  
Available on Infoscience
January 23, 2019
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/153950
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