Journal
JOURNAL OF HAZARDOUS MATERIALS
Volume 186, Issue 2-3, Pages 1206-1217Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.jhazmat.2010.11.116
Keywords
Bioremediation; Phytoremediation; Dissipation of PAHs; Bioavailability of PAHs; Soil peroxidase activity
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Funding
- Research Grants of the University Grants Committee of Hong Kong (Central Allocation, Group Research) [HKBU/03C]
- Hong Kong Baptist University
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The major aim of this experiment was to test the effects of a multi-component bioremediation system consisting of ryegrass (Lolium multiflorum), polycyclic aromatic hydrocarbons (PAHs)-degrading bacteria (Acinetobacter sp.), and arbuscular mycorrhizal fungi (Glomus mosseae) for cleaning up PAHs contaminated soil. Higher dissipation rates were observed in combination treatments: i.e., bacteria + ryegrass (BR), mycorrhizae + ryegrass (MR), and bacteria + mycorrhizae + ryegrass (BMR); than bacteria (B) and ryegrass (R) alone. The growth of ryegrass significantly (p < 0.05) increased soil peroxidase activities, leading to enhanced dissipation of phenanthrene (PHE) and pyrene (PYR) from soil. Interactions between ryegrass with the two microbes further enhanced the dissipation of PHE and PYR. Mycorrhizal ryegrass (MR) significantly enhanced the dissipation of PYR from soil, PYR accumulation by ryegrass roots and soil peroxidase activities under lower PHE and PYR levels (0 and 50 + 50 mg kg(-1)). The present results highlighted the contribution of mycorrhiza and PAH-degrading bacteria in phytoremediation of PAH contaminated soil, however more detailed studies are needed. (C) 2010 Elsevier B.V. All rights reserved.
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