Biodegradation of o-nitrophenol by aerobic granules with glucose as co-substrate

Author:

Basheer Farrukh1,Isa M. H.2,Farooqi I. H.1

Affiliation:

1. Environmental Engineering Section, Department of Civil Engineering, Aligarh Muslim University, Aligarh 202 002, India

2. Civil Engineering Department, Universiti Teknologi PETRONAS, 31750 Tronoh, Perak, Malaysia

Abstract

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 occured via catechol via nitrobenzene pathway. Specific o-nitrophenol biodegradation rates followed the Haldane model and the associated kinetic parameters were found as follows: Vmax = 3.96 g o-nitrophenol g−1VSS−1d−1, Ks = 198.12 mg L−1, and Ki = 31.16 mg L−1. The aerobic granules proved to be a feasible and effective way to degrade o-nitrophenol containing wastewater.

Publisher

IWA Publishing

Subject

Water Science and Technology,Environmental Engineering

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