Biodegradation of azo dyes in a sequential anaerobic-aerobic system.
A sequential anaerobic aerobic treatment process based on mixed culture of bacteria isolated from textile dye effluent-contaminated soil was used to degrade sulfonated azo dyes Orange G (OG), Amido black 10B (AB), Direct red 4BS (DR) and Congo red (CR). Under anaerobic conditions in a fixed-bed column using glucose as co-substrate, the azo dyes were reduced and amines were released by the bacterial biomass. The amines were completely mineralized in a subsequent aerobic treatment using the same isolates. The maximum degradation rate observed in the treatment system for OG was 60.9 mg/l per day (16.99 mg/g glucose utilized), for AB 571.3 mg/l per day (14.46 mg/g glucose utilized), for DR 112.5 mg/l per day (32.02 mg/g glucose utilized) and for CR 134.9 mg/l per day (38.9 mg/g glucose utilized).
Rajaguru
P
P
Department of Environmental Science, PSG College of Arts and Science, Coimbatore, India.
Kalaiselvi
K
K
Palanivel
M
M
Subburam
V
V
D000332:Aerobiosis; D000580:Amido Black / Q000378:metabolism; D000588:Amines / Q000378:metabolism; D000693:Anaerobiosis; D001391:Azo Compounds / Q000378:metabolism*; D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D018533:Biomass; D004396:Coloring Agents / Q000378:metabolism*; D003224:Congo Red / Q000378:metabolism; D005947:Glucose / Q000378:metabolism; D007700:Kinetics; D010084:Oxidation-Reduction
D000588:Amines; D001391:Azo Compounds; D004396:Coloring Agents; C008710:Orange G; D003224:Congo Red; D005947:Glucose; D000580:Amido Black