Phytoremediation for phenanthrene and pyrene contaminated soils

Area of Science:

• Environmental Science
• Bioremediation
• Soil Science

Background:

• Polycyclic Aromatic Hydrocarbons (PAHs) like phenanthrene and pyrene pose significant soil contamination risks.
• Phytoremediation offers a sustainable approach to remediate contaminated soils.

Purpose of the Study:

• To investigate the efficacy of twelve plant species in the phytoremediation of phenanthrene and pyrene contaminated soils.
• To evaluate the roles of plant uptake, accumulation, and plant-promoted microbial activity in PAH removal.

Main Methods:

• Twelve plant species were used to treat soils spiked with phenanthrene and pyrene over 45 days.
• Concentrations of phenanthrene and pyrene in soil and plant roots were measured.
• Root concentration factors (RCFs) and plant uptake were quantified.
• The contribution of plant-promoted microbial biodegradation was inferred.

Main Results:

• Vegetated soils showed significantly lower phenanthrene and pyrene concentrations compared to non-vegetated soils.
• Plant uptake and accumulation accounted for a minor fraction (<0.23%) of the total contaminant loss.
• Plant-promoted microbial biodegradation was identified as the dominant phytoremediation mechanism.

Conclusions:

• Phytoremediation is a feasible strategy for soils contaminated with phenanthrene and pyrene.
• The primary mechanism driving phytoremediation in this study was enhanced microbial degradation facilitated by plants.