Decolorization of disperse red 354 azo dye in water by several oxidation processes-a comparative study
Decolorization of disperse red 354 azo dye in water by several oxidation processes-a comparative study
- Dyes and Pigments, 60, p.61-68, 2004 .
The degradation of the Disperse Red 354 azo dye in water was investigated in laboratory-scale experiments, using four advanced oxidation processes (AOPs): ozonation, Fenton, UV/H2O2, and photo-Fenton. The photodegradation experiments were carried out in a stirred batch photoreactor equipped with an immersed low-pressure mercury lamp as UV source. Besides the conventional parameters, on acute toxicity test with a LUMIStox 300 instrument was conducted and the results were expressed as the percentage inhibition of the luminescence of the bacteria Vibrio fisheri. The results obtained showed that the decolorization rate was quite different for each oxidation process. After 30 min reaction time the relative order established was: UV/H2O2/Fe(II)> Dark/H2O2/Fe(II)> UV/H2O2=O3 > UV/H2O2/Lyocol. During the same reaction period the relative order for COD removal rate was slightly different: UV/H2O2/Fe(II)> Dark/H2O2/Fe(II)> UV/H2O2 > UV/H2O2/Lyocol > O3. A color removal of 85
DISPERSE RED 354
OZONATION
H2O2/UV
FENTON
PHOTO-FENTON
BIOLUMINESCENCE TEST
The degradation of the Disperse Red 354 azo dye in water was investigated in laboratory-scale experiments, using four advanced oxidation processes (AOPs): ozonation, Fenton, UV/H2O2, and photo-Fenton. The photodegradation experiments were carried out in a stirred batch photoreactor equipped with an immersed low-pressure mercury lamp as UV source. Besides the conventional parameters, on acute toxicity test with a LUMIStox 300 instrument was conducted and the results were expressed as the percentage inhibition of the luminescence of the bacteria Vibrio fisheri. The results obtained showed that the decolorization rate was quite different for each oxidation process. After 30 min reaction time the relative order established was: UV/H2O2/Fe(II)> Dark/H2O2/Fe(II)> UV/H2O2=O3 > UV/H2O2/Lyocol. During the same reaction period the relative order for COD removal rate was slightly different: UV/H2O2/Fe(II)> Dark/H2O2/Fe(II)> UV/H2O2 > UV/H2O2/Lyocol > O3. A color removal of 85
DISPERSE RED 354
OZONATION
H2O2/UV
FENTON
PHOTO-FENTON
BIOLUMINESCENCE TEST