期刊
INTERNATIONAL BIODETERIORATION & BIODEGRADATION
卷 63, 期 7, 页码 913-922出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.ibiod.2009.06.013
关键词
Polycyclic aromatic hydrocarbons; Surfactants; Biodegradation; Aerobic bacteria
资金
- Spanish Ministry of Environment [13/2006/2-1.1]
- Fundacion Alfonso Martin Escudero
The aim of this work was to evaluate the effect of several non-ionic surfactants (Tween-80, Triton X-100 and Tergitol NP-10) on the ability of different bacteria (Enterobacter sp., Pseudomonas sp. and Stenotrophomonas sp.) to degrade polycyclic aromatic hydrocarbons (PAHs). Bacterial cultures were performed at 25 degrees C in an orbital shaker under dark conditions in BHB medium containing 1% of surfactant and 500 mg l(-1) of each PAH. Experiments performed with Tween-80 showed the highest cell density values and maximum specific growth rate because this surfactant was used as a carbon source by all bacteria. High degree of PAHs degradation (>90%) was reached in 15 days in all experiments. Toxicity increased at early times using Tween-80 but decreased to low levels in a short time after the firsts 24 h. On the other hand, Triton X-100 and Tergitol NP-10 were not biodegraded and toxicity kept constant along time. However, PAHs-degradation rate was higher, especially by the action of Enterobacter sp. with Tween-80 or Triton X-100. Control experiments performed without surfactant showed a significant decrease in biomass growth rate with a subsequent loss of biodegradation activity likely due to a reduced solubility and bioavailability of PAHs in absence of surfactant. (C) 2009 Elsevier Ltd. All rights reserved.
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