Abstract
In light of the rising presence of contaminants of emerging concern in water streams, in recent decades, advanced oxidation processes have received significant research interest, as the generation of oxidative radicals allows for the effective degradation of recalcitrant compounds. This review paper provides insights into the most relevant generation methods of several oxidative species, with a main emphasis on hydroxyl, sulfate, chlorine and iodine radicals. Understanding the strengths and pitfalls of each generation route is essential to set the baseline for future industrial applications. To this end, this review presents a comprehensive summary of how different techniques result in distinct radical types, and in addition to the principles and mechanisms of formation, the environmental and economic aspects behind the different methods are discussed.
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Abbreviations
- AFT:
-
Anodic Fenton treatment
- AOP(s):
-
Advanced oxidation process(es)
- BDD:
-
Boron-doped diamond
- CDRs:
-
Chlorine-derived radicals
- CECs:
-
Contaminants of emerging concern
- COD:
-
Chemical oxygen demand
- DSAs:
-
Dimensionally stable anodes
- eAOPs:
-
Electrochemical advanced oxidation processes
- EDDS:
-
[S,S]-Ethylene-diamine-disuccinic acid
- EDTA:
-
Ethylene-diamine-tetra-acetic acid
- EE2:
-
Ethinylestradiol
- FCE:
-
Freeze concentration effect
- FFA:
-
Furfuryl alcohol
- GAC:
-
Granular activated carbon
- LGSFY:
-
Light green SF yellowish
- MMO:
-
Mixed metal oxide
- NOM:
-
Natural organic matter
- PDS:
-
Peroxydisulfate
- PFOA:
-
Perfluorooctanoic acid
- PMS:
-
Peroxymonosulfate
- PPCP(s):
-
Pharmaceuticals and personal care product(s)
- RNS:
-
Reactive nitrogen species
- SR-AOP(s):
-
Sulfate radical-based advanced oxidation process(es)
- TN:
-
Total nitrogen
- TOC:
-
Total organic carbon
- UV:
-
Ultraviolet
- WAO:
-
Wet air oxidation
- (n)ZVI:
-
(nano) Zero-valent ion
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Acknowledgements
The research leading to these results received funding from the European Union’s EU Framework Programme for Research and Innovation Horizon 2020 under Grant Agreement No 861369 (MSCA-ETN InnovEOX) and from the KU Leuven Industrial Research Council under grant numbers C24E/19/040 (SO4ELECTRIC) and C3/20/094 (Sani-TRouBLe).
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Feijoo, S., Yu, X., Kamali, M. et al. Generation of oxidative radicals by advanced oxidation processes (AOPs) in wastewater treatment: a mechanistic, environmental and economic review. Rev Environ Sci Biotechnol 22, 205–248 (2023). https://doi.org/10.1007/s11157-023-09645-4
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DOI: https://doi.org/10.1007/s11157-023-09645-4