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Microbial degradation of nitrobenzene and mono-nitrophenol by bacteria enriched from municipal activated sludge.

Using a mixture of three mono nitrophenols as sole carbon, nitrogen and energy sources, mixed cultures were enriched from municipal activated sludge to degrade both nitrophenols and nitrobenzene. Bacterial growth and degradation rate could be increased by supplementing the medium with 0.1% YE. Microorganisms were isolated from the nitrophenols enrichment, and they were identified as strains of Comamonas testosteroni and Acidovorax delafieldii. These strains showed broad degradation ability toward nitrophenols and nitrobenzene.