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PILOT-SCALE DEMONSTRATION OF PHYTOREMEDIATION OF PAH-CONTAMINATED SEDIMENTS BY HYDRILLA VERTICILLATA AND VALLISNERIA SPIRALIS
He, Y. and J. Chi.
Environmental Technology [published online 9 Nov 2017 prior to print]

Phytoremediation of PAH-contaminated sediments was investigated using two submerged aquatic plants (Vallisneria spiralis and Hydrilla verticillata) over a period of 108 days. The plants grew well, and more PAHs were removed from planted sediments than unplanted sediments. Final dissipation ratios of phenanthrene and pyrene were 85.9% and 79.1% in sediments planted with V. spiralis and 76.3% and 64.6% in sediments planted with H. verticillata, but only 64.8% and 55.8% in unplanted sediments. V. spiralis exhibited higher phytoremediation ability, which was significantly related to its root oxygenation. When the field results were compared with those previously obtained in the lab, the ratio of root weight to sediment weight showed a similar trend to PAH dissipation enhancement. Bioconcentration factors of PAHs in the two plants were larger in the field study than in the lab owing to a quicker increase of plant weight in the field.



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