Abstract
Aims
Some experiments were designed to evaluate the influences of field directions and voltages on the remediation efficiency and environmental risk during the chelator assisted phytoremediation processes.
Methods
Biomass production, metal accumulation and transportation and leachate interception under different electrode arrangements with varied voltages were compared.
Results
Biomass yield increased from 2.71 kg in control to 3.45 kg in low voltage (2 V) treatments and then decreased to 3.12 and 2.66 kg in moderate (4 V) and high (10 V) voltage treatments, respectively. Metal uptake and transportation of the species were affected by field directions and voltages. Electric fields can strengthen the promoting effect of chelator for phytoremediation and alleviate even eliminate the environmental risk caused by chemical amendment, as manifested by the significantly decreased volume of leachate ranging from 56 mL in vertical field treatment with high voltage to 401 mL in horizontal field treatment with low voltage. Voltages had greater impact on the metal decontamination capacity of the species relative to electric field directions, but the prevention of leaching depended more on electrode arrangements than voltages.
Conclusions
Vertical electric field with moderate voltage achieved the optimal effect on metal decontamination and leachate interception in the phytoremediation processes.
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Acknowledgments
The authors wish to thank the Natural Science Foundation of Hubei Province of China (Project No. 2015CFB603), Science & Technology Project of Education Department, Hubei Province, China, and State Key Laboratory of Organic Geochemistry, GIGCAS for the financial support of this study.
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Luo, J., Ye, L., Qi, S. et al. Effect of electrode configurations on phytoremediation efficiency and environmental risk. Plant Soil 424, 607–617 (2018). https://doi.org/10.1007/s11104-018-3569-x
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DOI: https://doi.org/10.1007/s11104-018-3569-x