Photocatalytic and combined anaerobic-photocatalytic treatment of textile dyes.
A photocatalytic process based on immobilized titanium dioxide was used to treat crude solutions of azo, anthraquinone and phthalocyanine textile dyes. In addition, the process was applied to the treat autoxidized chemically reduced azo dyes, i.e. representatives of recalcitrant dye residues after biological sequential anaerobic-aerobic treatment. Photocatalysis was able to remove more than 90% color from crude as well as autoxidized chemically reduced dye solutions. UV-absorbance and COD were also removed but to a lower extent (50% in average). The end products of photocatalytic treatment were not toxic toward methanogenic bacteria. The results demonstrate that photocatalysis can be used as a pre- or post-treatment method to biological anaerobic treatment of dye-containing textile wastewater.
Harrelkas
F
F
Laboratoire des Sciences du Génie Chimique, CNRS, Nancy University, INPL, 1 Rue Grandville, BP 20451, 54001 Nancy Cedex, France.
Paulo
A
A
Alves
M M
MM
El Khadir
L
L
Zahraa
O
O
Pons
M N
MN
van der Zee
F P
FP
D000332:Aerobiosis; D000693:Anaerobiosis; D001391:Azo Compounds / Q000737:chemistry / Q000378:metabolism; D001419:Bacteria / Q000254:growth & development / Q000378:metabolism; D001673:Biodegradation, Environmental / Q000528:radiation effects; D002384:Catalysis / Q000528:radiation effects; D004396:Coloring Agents / Q000737:chemistry* / Q000378:metabolism; D007220:Industrial Waste; D008697:Methane / Q000378:metabolism; D015394:Molecular Structure; D010777:Photochemistry; D013783:Textile Industry; D014025:Titanium / Q000737:chemistry / Q000378:metabolism; D018505:Waste Management / Q000295:instrumentation / Q000379:methods*
D001391:Azo Compounds; D004396:Coloring Agents; D007220:Industrial Waste; C009495:titanium dioxide; D014025:Titanium; D008697:Methane