| Summary: | 碩士 === 國立屏東科技大學 === 環境工程與科學系所 === 103 === Nowadays the technology of phytoremediation for contaminated sites with heavy metals is better than traditional chemical approaches. However, most of the research on phytoremediation is in experimental stage and trying out pot culture as the experiment.
The effects of phytoremediation in contaminated site not only can maintain the original characteristics and quality of the soil but also avoid causing the great damage of the properties of the soil. The study area is located at a waste dumping site in southern Taiwan and has been performed the experiment of phytoremediation and assessed the effectiveness of the phytoremediation in the heavy-metal contaminated sites by the ways of phytoextraction and phytostabilization. Firstly, we assessed the yptake of the metals by the plants. Secondly, turning it into the tissue and at the end, eliminating the tissue that’s been polluted by heavy metals. On the other hand, in terms of phytostabilization also has to use the same way to stabilize heavy metals by absorbing and recovering and to reduce the solubility of heavy metals for achieving the purpose of the phytoremediation. We used Swietenia macrophylla, Salix warburgu, Zea mays, Helianthus annuus, and Ricinus communis as the tested plants for phytoextraction. Mulberry, Vetiver, Pachira Aquatica, and Schefflera Arboricola were proposed as phytostabilizers. After assessing the result of phytoremediation, we found that Ricinus communis and Salix warburgu were very effective in phytoextraction. Although the TF values of Helianthus annuus and Zea mays were lower than 1.0, it can be multiple collection and still have the capability of eliminating heavy metals. If it can be conducting this study extensively by planting the plants, the time we estimate that can reduce the heavy metals from the soils takes 172 years. The plants in the experiment of phytostabilization have the effect of accumulating heavy metals in their roots and avoid them to be ablating, runoff and leaching to contaminate other environment.
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