Aerobic degradation of the azo dye acid red 151 in a sequencing batch biofilter.
The azo dye acid red 151 (AR151) was aerobically biodegraded in a sequencing batch biofilter packed with a porous volcanic rock. AR151 was used as the sole source of carbon and energy for acclimated microorganisms. Acclimation was followed using the degradation time and the oxygen uptake rate. A maximal oxygen uptake rate of 0.5 mg O(2)/(lmin) was obtained. Mineralization studies showed that 73% (as carbon) of the initial azo dye was transformed to CO(2) by the consortia. A maximal substrate degradation rate of 247 mg AR151/(l(reactor)d) was obtained. Color removal was up to 99% using an initial concentration of 50 mg AR151/l. Anaerobic tests suggested that in the interior of the porous material, anaerobic biotransformations can occur, contributing from 14% to 16% of the decoloration of the azo dye.
Buitrón
Germán
G
Department of Environmental Bioprocesses, Institute of Engineering, UNAM, CU Ap. Postal 70-472, 04510, Mexico DF, Mexico. gbm@pumas.iingen.unam.mx
Quezada
Maribel
M
Moreno
Gloria
G
D001391:Azo Compounds / Q000378:metabolism*; D001419:Bacteria / Q000378:metabolism*; D001673:Biodegradation, Environmental; D019149:Bioreactors; D003116:Color; D005374:Filtration; D007700:Kinetics; D009281:Naphthalenes / Q000378:metabolism*; D010100:Oxygen / Q000378:metabolism; D014865:Waste Disposal, Fluid / Q000379:methods*; D014874:Water Pollutants, Chemical / Q000378:metabolism*
C479461:Acid Red-151; D001391:Azo Compounds; D009281:Naphthalenes; D014874:Water Pollutants, Chemical; D010100:Oxygen