Remediation of PAH-contaminated soil by the combination of tall fescue, arbuscular mycorrhizal fungus and epigeic earthworms

•Planting tall fescue can significantly increase soil PAH removal.•The inoculation of AMF can significantly enhance PAH removal.•The highest PAH removal was obtained in the treatment: tall fescue+AMF+earthworms. A 120-day experiment was performed to investigate the effect of a multi-component biorem...

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Bibliographic Details
Published in:Journal of hazardous materials 2015-03, Vol.285, p.535-541
Main Authors: Lu, Yan-Fei, Lu, Mang
Format: Article
Language:English
Subjects:
AMF
Animals
Biodegradation, Environmental
Catechol Oxidase - metabolism
Density
Dissipation
DNA, Bacterial - analysis
Eisenia foetida
Festuca - growth & development
Festuca - metabolism
Festuca - microbiology
Festuca arundinacea
Fungi
Genes, Bacterial
Glomeromycota - metabolism
Glomus
Inoculation
Mycorrhizae - metabolism
Oligochaeta - metabolism
Phytoremediation
Plant Roots - growth & development
Plant Roots - metabolism
Plant Roots - microbiology
Plant Shoots - growth & development
Plant Shoots - metabolism
Plant Shoots - microbiology
Plants (organisms)
Polyallylamine hydrochloride
Polycyclic Aromatic Hydrocarbons - metabolism
Polyphenol oxidase
qPCR
Remediation
Soil (material)
Soil Microbiology
Soil Pollutants - metabolism
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Summary:•Planting tall fescue can significantly increase soil PAH removal.•The inoculation of AMF can significantly enhance PAH removal.•The highest PAH removal was obtained in the treatment: tall fescue+AMF+earthworms. A 120-day experiment was performed to investigate the effect of a multi-component bioremediation system consisting of tall fescue (Festuca arundinacea), arbuscular mycorrhizal fungus (AMF) (Glomus caledoniun L.), and epigeic earthworms (Eisenia foetida) for cleaning up polycyclic aromatic hydrocarbons (PAHs)-contaminated soil. Inoculation with AMF and/or earthworms increased plant yield and PAH accumulation in plants. However, PAH uptake by tall fescue accounted for a negligible portion of soil PAH removal. Mycorrhizal tall fescue significantly enhanced PAH dissipation, PAH degrader density and polyphenol oxidase activity in soil. The highest PAH dissipation (93.4%) was observed in the combination treatment: i.e., AMF+earthworms+tall fescue, in which the soil PAH concentration decreased from an initial value of 620 to 41mgkg−1 in 120 days. This concentration is below the threshold level required for Chinese soil PAH quality (45mgkg−1 dry weight) for residential use.
ISSN:0304-3894
1873-3336
DOI:10.1016/j.jhazmat.2014.07.021