Enhancing phenanthrene biomineralization in a polluted soil using gaseous toluene as a cosubstrate.
Environ Sci Technol
; 37(4): 805-10, 2003 Feb 15.
Article
em En
| MEDLINE
| ID: mdl-12636283
ABSTRACT
Laboratory experiments were conducted to study the potential of adding gaseous toluene, as a readily degradable carbon source, to enhance phenanthrene mineralization in polluted soil (1,000 mg/kg(dry soil)) aged for 400 days. Experiments were conducted in 0.5-L column reactors packed with a mixture of (8020 w(wet)/w(wet)) spiked soil and vermiculite and fed with 1 g m(-3)reactor h(-1) toluene load in air. Removal efficiencies of 100% for toluene and greater than 95% for phenanthrene were obtained in 190 h. Evolved CO2 showed that phenanthrene mineralization increased from 39% to 86% in columns treated with gaseous toluene. Phthalic acid was identified as the principal soluble intermediate, which accumulated when no toluene was added. Increased phenanthrene uptake and mineralization with toluene can be attributed to increased biomass and the induction of enzymes involved in the intermediate mineralization. In microcosm experiments, phthalic acid mineralization increased from 19% to 81% within 50 h in the presence of toluene. Experiments with 14C-labeled phenanthrene confirmed the enhancement of phenanthrene mineralization from 45% to 83% in 385 h with toluene as a second carbon source. The results indicate thatthe addition of an appropriate gaseous cosubstrate could be an adequate strategy to enhance mineralization of PAHs in soil.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Fenantrenos
/
Poluentes do Solo
/
Tolueno
Idioma:
En
Revista:
Environ Sci Technol
Ano de publicação:
2003
Tipo de documento:
Article
País de afiliação:
México