Degradation of cresols by phenol-acclimated aerobic granules

作者：Lee Duu Jong^*; Ho Kuo Ling; Chen Yu You

来源：Applied Microbiology and Biotechnology, 2011, 89(1): 209-215.

DOI：10.1007/s00253-010-2878-7

• Granules
• Haldane model
• Kinetics
• Cresol

High-strength cresol isomers were treated with phenol-acclimated granules in batch experiments. The aerobic granules effectively metabolized cresol isomers at concentrations up to 1,500 mg l(-1). The modified Haldane kinetic model, used to assess the kinetic behavior during cresol degradation by granule cells, yielded a high maximum specific growth rate (1.13-1.45 h(-1)) and inhibition constant (617-952 mg l(-1)). The microbial community structure, which was stable under cresol stress, was principally composed of genera Bacillus, Acinetobacter, Corynebacterium, and Nocardioides. Enzyme assay results suggest simultaneous expression of ortho-and meta-cleavage pathways during cresol degradation. Under high cresol concentrations, however, cresol isomers were largely degraded via the meta-cleavage pathway, likely attributable to the activity of Bacillus. The aerobic granular sludge system is a promising biotechnology for degrading wastewater containing high-strength cresols.

• 出版日期2011-1