4.7 Article

Bioremediation of 2-chlorophenol containing wastewater by aerobic granules-kinetics and toxicity

期刊

JOURNAL OF HAZARDOUS MATERIALS
卷 190, 期 1-3, 页码 222-228

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ELSEVIER
DOI: 10.1016/j.jhazmat.2011.03.029

关键词

Aerobic biodegradation; Aerobic granule; 2-chlorophenol; Pathway; Kinetics; Catechol

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  1. UGC

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2-Chlorophenol (2-CP) degrading aerobic granules were cultivated in a sequencing batch reactor (SBR) in presence of glucose. The organic loading rate (OLR) was increased from 6.9 to 9.7 kg COD m(-3) d(-1) (1150-1617 mg L-1 COD per cycle) during the experiment. The alkalinity (1000 mg L-1 as CaCO3) was maintained throughout the experiment. The specific cell growth rate was found to be 0.013 d(-1). A COD removal efficiency of 94% was achieved after steady state at 8 h HRT (hydraulic retention time). FTIR, UV, GC, GC/MS studies confirmed that the biodegradation of 2-CP occurs via chlorocatechol (modified ortho-cleavage) pathway. Biodegradation kinetics followed the Haldane model with kinetic parameters: V-max = 840 mg2-CPgMLVSS(-1) d(-1), K-s = 24.61 mg L-1, K-i = 315.02 mg L-1. Abiotic losses of 2-CP due to volatilization and photo degradation by sunlight were less than 3% and the results of genotoxicity showed that the degradation products are eco-friendly. (C) 2011 Elsevier B.V. All rights reserved.

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