Application of a sequential batch reactor system for textile dyes degradation: comparison between azo and phthalocyanine dyes.
Photocatalysis on supported TiO2 was combined with aerobic biological treatment in a sequential batch reactor to compare the degradation of two textile dyes: a blue azo dye (DR KBL CDG) and a green phthalocyanine dye (DR K4GN). Three reactors were run in parallel. SBR1 was used as a reference and was fed with urban wastewater only. SBR2 and SBR3 were fed with the same urban wastewater combined with pretreated (for SBR2) and non-pretreated (for SBR3) dye solution. For an azo dye concentration of 12 mg/L decolouration yields of 78 and 27% were achieved, respectively, in SBR2 and SBR3. For the phthalocyanine dye, the decolouration yields decreased to 24 and 15%, respectively. Concerning COD removal it decreases for both dyes with and without pretreatment, when the dye concentration increases. Although a detrimental effect on biomass could be observed, bacteria were able to cope with the inhibitory effect of the dyes.
Harrelkas
F
F
Laboratoire des Sciences du Génie Chimique, CNRS-ENSIC-INPL, BP 20451, F54001 Nancy, France.
Pons
M N
MN
Zahraa
O
O
Yaacoubi
A
A
Lakhal
E K
EK
D001391:Azo Compounds / Q000378:metabolism*; D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors; D002384:Catalysis; D004396:Coloring Agents / Q000378:metabolism*; D007211:Indoles / Q000378:metabolism; D054833:Isoindoles; D015394:Molecular Structure; D010777:Photochemistry / Q000379:methods; D010860:Pigments, Biological / Q000378:metabolism; D013784:Textiles; D014025:Titanium; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000032:analysis
D001391:Azo Compounds; D004396:Coloring Agents; D007211:Indoles; D054833:Isoindoles; D010860:Pigments, Biological; D014874:Water Pollutants, Chemical; C009495:titanium dioxide; D014025:Titanium; C013647:phthalocyanine