Abstract
The purpose of this study was to treat soils contaminated by pyrene through phytoremediation. The plant species selected were Phragmites communis Trin., Typha orientalis Presl, Vetiveria zizanioides, Rohdea japonica (Thunb.) Roth et Kunth, Cyperus malaccensis. Lam. subsp. monophyllus (Vahl) T. Koyama, Bolboschoenus planiculmis (F. Schmidt) T. Koyama, and Bidens pilosa. The degradation of pyrene in soils was analyzed. The experimental results of this study indicated that the degradation efficiencies of pyrene from soils by V. zizanioides, R. japonica, and T. orientalis were 86, 84, and 77%, respectively, after 14 weeks. These values of degradation percentages were higher than those measured in the unplanted control experiment, which was found equal to 66%. In addition, the pyrene degradation efficiencies in summer were found to be higher than those in winter. The degradation percentages of pyrene sterilized soil with and without T. orientalis were found to be 59 and 55%, respectively. These values were fou...
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