期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 563, 期 -, 页码 693-703出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2015.10.061
关键词
Co-contamination; Heavy metals; Petroleum hydrocarbons; Natural attenuation; Bioaugmentation; Phytoremediation
资金
- French Ile-de-France region
- European Commission [2010-0009]
- Mediterranean Office for Youth (MOY) [2010/038]
Biological remediation technologies are an environmentally friendly approach for the treatment of polluted soils. This study evaluated through a pot experiment four bioremediation strategies: a) natural attenuation, b) phytoremediation with alfalfa (Medicago sativa L.), c) bioaugmentation with Pseudomonas aeruginosa and d) bioaugmentation-assisted phytoremediation, for the treatment of a co-contaminated soil presenting moderate levels of heavy metals (Cu, Pb and Zn at 87, 100 and 110 mg kg(-1) DW, respectively) and petroleum hydrocarbons (3800 mg kg(-1) DW). As demonstrated by plant biomass and selected physiological parameters alfalfa plants were able to tolerate and grow in the co-contaminated soil, especially when soil was inoculated with P. aeruginosa, which promoted plant growth (56% and 105% increase for shoots and roots, respectively) and appeared to alleviate plant stress. The content of heavy metals in alfalfa plants was limited and followed the order: Zn > Cu > Pb. Heavy metals were mainly concentrated in plant roots and were poorly translocated, favouring their stabilization in the root zone. Bioaugmentation of planted soil with P. aeruginosa generally led to a decrease of plant metal concentration and translocation. The highest degree of total petroleum hydrocarbon removal was obtained for bioaugmentation-assisted phytoremediation treatment (68%), followed by bioaugmentation (59%), phytoremediation (47%) and natural attenuation (37%). The results of this study demonstrated that the combined use of plant and bacteria was the most advantageous option for the treatment of the present co-contaminated soil, as compared to natural attenuation, bioaugmentation or phytoremediation applied alone. (C) 2015 Elsevier B.V. All rights reserved.
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