Biodegradation of 2,4-dichlorophenol by a Bacillus consortium

Yesenia Herrera, Anthony I. Okoh, Laura Alvarez, Norma Robledo, María R. Trejo-Hernández

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30 Scopus citations


As part of our effort at establishing microbial consortia of relevance for the bioremediation of xenobiotics polluted environments in Mexico, we assessed the aerobic biodegradation of 2,4-dichlorophenol (2,4-DCP) by a consortium of four Bacillus species that were isolated from a polluted soil by enrichment using a mixture of chlorophenols. The bacterial consortium effectively biodegraded 2-chlorophenol, 3-chlorophenol and 2,4-dichlorophenol at degradation rates of between 1.7 and 6.7 μmoles l-1 h-1. In the presence of NH4Cl or KNO2 as nitrogen sources, 2,4-DCP was variously degraded. Under both conditions, cell biomass attained highest values of 350 and 450 mg l-1 respectively, while the amounts of 2,4-DCP metabolized in 21 days reached peak values of 2.1 and 2.5 mM representing between 70 and 85% degradation respectively. Chloride releases during the same period were highest at 4.7 mM and 5.3 mM in the presence of the two nitrogen sources. The presence of free-chloride in the culture medium had a significant impact on the catabolism of 2,4-dichlorophenol.

Original languageEnglish
Pages (from-to)55-60
Number of pages6
JournalWorld Journal of Microbiology and Biotechnology
Issue number1
StatePublished - Jan 2008


  • 2,4-Dichlorophenol
  • Bacillus consortium
  • Biodegradation
  • Nitrogen source


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