Journal
INTERNATIONAL JOURNAL OF PHYTOREMEDIATION
Volume 18, Issue 11, Pages 1136-1147Publisher
TAYLOR & FRANCIS INC
DOI: 10.1080/15226514.2016.1186594
Keywords
cobalt; petroleum hydrocarbon; phytoremediation; polycyclic aromatic hydrocarbon; lead
Categories
Funding
- Industrial Development Centre in Kalmar County (IUC)
- Regional Council of Kalmar County, Genome Quebec
- Quebec Centre for Biodiversity Science (QCBS)
- Regional Council of Kalmar County, Genome Canada
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Several Gentle Remediation Options (GRO), e.g., plant-based options (phytoremediation), singly and combined with soil amendments, can be simultaneously efficient for degrading organic pollutants and either stabilizing or extracting trace elements (TEs). Here, a 5-month greenhouse trial was performed to test the efficiency of Medicago sativa L., singly and combined with a compost addition (30% w/w), to treat soils contaminated by petroleum hydrocarbons (PHC), Co and Pb collected at an auto scrap yard. After 5 months, total soil Pb significantly decreased in the compost-amended soil planted with M. sativa, but not total soil Co. Compost incorporation into the soil promoted PHC degradation, M. sativa growth and survival, and shoot Pb concentrations [3.8mg kg(-1) dry weight (DW)]. Residual risk assessment after the phytoremediation trial showed a positive effect of compost amendment on plant growth and earthworm development. The O-2 uptake by soil microorganisms was lower in the compost-amended soil, suggesting a decrease in microbial activity. This study underlined the benefits of the phytoremediation option based on M. sativa cultivation and compost amendment for remediating PHC- and Pb-contaminated soils.
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