Pyrene removal and transformation by joint application of alfalfa and exogenous microorganisms and their influence on soil microbial community.
Ecotoxicol Environ Saf
; 110: 129-35, 2014 Dec.
Article
em En
| MEDLINE
| ID: mdl-25232990
ABSTRACT
Phytoremediation is an attractive approach for the cleanup of polycyclic aromatic hydrocarbons-contaminated soil. The joint effect of alfalfa and microorganisms, including Arthrobacter oxydans, Staphylococcus auricularis and Stenotrophomonas maltophilia, on pyrene removal was investigated. The results showed that the joint effect primarily contributed to pyrene removal, and the concentration of residual pyrene in rhizosphere soil was lower than that in non-rhizosphere soil. After joint treatment for 45d, pyrene in rhizosphere soils decreased from 11.3, 52.5 and 106.0mg/kg to 2.0-3.0, 15.0-18.7, and 41.2-44.8mg/kg, respectively. These bacteria significantly enhanced pyrene accumulation and microbial community diversity, and increased soil dehydrogenase and polyphenol oxidase activities. Pyrene was initially degraded through ring cleavage. One of the main metabolites 4-dihydroxy-phenanthrene was transformed into naphthol and 1,2-dihydroxynaphthalene, which were further degraded through salicylic acid pathway and phthalic acid pathway, separately.
Palavras-chave
Texto completo:
1
Coleções:
01-internacional
Base de dados:
MEDLINE
Assunto principal:
Arthrobacter
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Pirenos
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Microbiologia do Solo
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Poluentes do Solo
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Staphylococcus
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Stenotrophomonas maltophilia
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Medicago sativa
Idioma:
En
Ano de publicação:
2014
Tipo de documento:
Article