Disinfection by-product formation during UV/Chlorine treatment of pesticides in a novel UV-LED reactor at 285 nm and the mitigation impact of GAC treatment

Simple item page
dc.contributor.authorCarra, Irene
dc.contributor.authorLozano, Javier Fernandez
dc.contributor.authorAutin, Olivier
dc.contributor.authorBolton, James R.
dc.contributor.authorJarvis, Peter
dc.date.accessioned2020-01-16T10:45:27Z
dc.date.available2020-01-16T10:45:27Z
dc.date.issued2020-01-07
dc.description.abstractThe UV/Chlorine process has gained attention in recent years due to the high quantum yield and absorbance of the chlorine species. However, there are still many unknowns around its application as a treatment for drinking water. The potential for the formation of disinfection by-products (DBPs) is one of them. There are no studies reporting on the formation of trihalomethanes (THMs) or haloacetic acids (HAAs) in complex matrices, such as real source waters, at UV wavelengths tailored to the UV/Chlorine process, which has been possible thanks to the development of light emitting diodes (LEDs). In addition, consideration of mitigation measures that might be needed after UV/Chlorine treatment for full scale application have not been previously reported. Specifically, the novelty of this work resides in the use of an innovative reactor using UV-LEDs emitting at 285 nm for the removal of three pesticides (metaldehyde, carbetamide and mecoprop), the evaluation of THM, HAA and bromate formation in real water sources by UV/Chlorine treatment and the mitigation effect of subsequent GAC treatment. A new parameter, the applied optical dose (AOD), has been defined for UV reactors, such as the one in the present study, where the irradiated volume is non-uniform. The results showed the feasibility of using the UV/Chlorine process with LEDs, although a compromise is needed between pH and chlorine concentration to remove pesticides while minimising DBP formation. Overall, the UV/Chlorine process did not significantly increase THM or HAA formation at pH 7.9–8.2 at the studied wavelength. At acidic pH, however, THM formation potential increased up to 30% after UV/Chlorine treatment with concentrations up to 60 μg/L. HAA formation potential increased between 100 and 180%, although concentrations never exceeded 35 μg/L. In all cases, GAC treatment mitigated DBP formation, reducing THM formation potential to concentrations between 3 and 16 μg/L, and HAA formation potential between 4 and 30 μg/L.en_UK
dc.identifier.citationCarra I, Lozano JF, Autin O, et al., (2020) Disinfection by-product formation during UV/Chlorine treatment of pesticides in a novel UV-LED reactor at 285 nm and the mitigation impact of GAC treatment. Science of the Total Environment, Volume 712, April 2020, Article number 136413en_UK
dc.identifier.cris25809349
dc.identifier.issn0048-9697
dc.identifier.urihttps://doi.org/10.1016/j.scitotenv.2019.136413
dc.identifier.urihttp://dspace.lib.cranfield.ac.uk/handle/1826/14931
dc.language.isoenen_UK
dc.publisherElsevieren_UK
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.rights.urihttp://creativecommons.org/licenses/by-nc-nd/4.0/*
dc.subjectLight emitting diodes (LEDs)en_UK
dc.subjectTrihalomethanes (THM)en_UK
dc.subjectHaloacetic acids (HAA)en_UK
dc.subjectBromateen_UK
dc.subjectAdvanced oxidation process (AOP)en_UK
dc.subjectChlorineen_UK
dc.subjectActivated carbonen_UK
dc.subjectDrinking wateren_UK
dc.titleDisinfection by-product formation during UV/Chlorine treatment of pesticides in a novel UV-LED reactor at 285 nm and the mitigation impact of GAC treatmenten_UK
dc.typeArticleen_UK

Files

Original bundle
Now showing 1 - 1 of 1
Thumbnail Image
Name:
Disinfection_by-product_formation_during_UV-2020.pdf
Size:
1.28 MB
Format:
Adobe Portable Document Format
Description:
Download
License bundle
Now showing 1 - 1 of 1
No Thumbnail Available
Name:
license.txt
Size:
1.63 KB
Format:
Item-specific license agreed upon to submission
Description:
Download

Collections

Staff publications (SWEE)