Environmental Engineering Reference
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Advanced Oxidation Processes for
Removal of Dyes from Aqueous Media
Süheyda Atalay and Gülin Ersöz
Ege University, Faculty of Engineering, Chemical Engineering Department,
İzmir, Turkey
Abstract
Dyes are synthetically aromatic compounds used in various industries such as tex-
tile, plastics, pharmaceutical, paper, paint and food. The quality and quantity of
wastewaters from these industries are a matter of concern for human health and
environmental pollution.
Different conventional methods have been developed for dye removal. However,
due to the complex structure and recalcitrant nature of dyes, these methods appear
to be ineffective in their complete removal.
Advanced Oxidation Processes (AOPs) have been considered as a promising
alternative to treat wastewater containing dye residues. These processes are based
on the production of highly reactive radicals, especially hydroxyl radicals, which
promote destruction of the target pollutant until mineralization.
This chapter addresses AOPs for removal of dyes from aqueous media by pre-
senting background on advanced oxidation processes. The AOPs will be investi-
gated in two categories: Nonphotochemical and Photochemical Processes. Among
these processes, the main focus will be on ozonation, Fenton's reagent oxidation,
wet air oxidation and photocatalytic oxidation, with only brief information given
on electrochemical oxidation, ultraviolet irradiation and hydrogen peroxide (UV/
H
2
O
2
) and photocatalytic ozonation (UV/O
3
) processes.
Keywords:
Removal of dyes, advanced oxidation processes, non-photochemical
advanced oxidation processes, photochemical advanced oxidation processes,
ozonation, Fenton's reagent oxidation, wet air oxidation, electrochemical
oxidation, photocatalytic oxidation
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