Biodegradation of o-nitrophenol by aerobic granules with glucose as co-substrate.
Aerobic granules to treat wastewater containing o-nitrophenol were successfully developed in a sequencing batch reactor (SBR) using activated sludge as inoculum. Stable aerobic granules were obtained with a clearly defined shape and diameters ranging from 2 to 6 mm after 122 days of operation. The integrity coefficient (IC) and granules density was found to be 98% and 1,054 kg m(-3) respectively. After development of aerobic granules, o-nitrophenols were successfully degraded to an efficiency of 78% at a concentration of 70 mg L(-1). GC-MS study revealed that the biodegradation of o-nitrophenol occurred via catechol via nitrobenzene pathway. Specific o-nitrophenol biodegradation rates followed the Haldane model and the associated kinetic parameters were found as follows: V(max) = 3.96 g o-nitrophenol g(-1)VSS(-1)d(-1), K(s) = 198.12 mg L(-1), and K(i) = 31.16 mg L(-1). The aerobic granules proved to be a feasible and effective way to degrade o-nitrophenol containing wastewater.
Department of Civil Engineering, Aligarh Muslim University, Aligarh, India. farrukhbasheer@yahoo.com
Farrukh
F
Basheer
M H
MH
Isa
I H
IH
Farooqi
D000332:Aerobiosis; D018533:Biomass; D019149:Bioreactors; D008401:Gas Chromatography-Mass Spectrometry; D005947:Glucose / Q000378:metabolism*; D007700:Kinetics; D009596:Nitrophenols / Q000378:metabolism*
D009596:Nitrophenols; D005947:Glucose