Environmental Engineering Reference
In-Depth Information
Table 4.1
(
Cont
.)
Technology
Target Dye
Signiicant factors
Results
Advantages/
Disadvantages
References
Advanced
oxidation
processes
(AOPs)
Several
textile
dyes
Ozone (O
3
), hydrogen
peroxide (H
2
O
2
),
wavelength of
ultraviolet (UV)
light, O
3
/UV, H
2
O
2
/
UV, O
3
/H
2
O
2
/UV,
solution pH, dye
concentration, and
temperature;
i) in O
3
/UV process hydroxyl
radical (HO
·
) is produced
ater activation of O
3
by UV
( = 254 nm);
ii) H
2
O
2
/UV also produces HO
·
radical for dye degradation;
iii) among all AOPs O
3
/H
2
O
2
/
UV shows highest eiciency
for dye degradation;
Advantages: complete
mineralization
achieved in
presence of HO
·
; no
sludge generation,
appropriate process
for recalcitrant
dyes;
Disadvantages:
several by-product
formations,
less economic
feasibility;
(4)
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