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標題: | 用生物滯留系統去除都市逕流中之重金屬 Heavy metal removal from urban stormwater runoff using bioretention systems |
作者: | Shu-Wen Jang 張舒雯 |
指導教授: | 林逸彬 |
關鍵字: | 生物滯留系統,重金屬,雨水逕流,酸性逕流,植物修復, bioretention system,heavy metals,stormwater runoff,acidic runoff,phytoremediation, |
出版年 : | 2018 |
學位: | 碩士 |
摘要: | 汽機車的廢氣排放、建築材料的風化、農業的活動和大氣的沉降會導致鉛、銅、鋅和其它重金屬在暴雨時進入都市徑流。生物滯留系統是最廣泛使用的都市逕流淨化的管理方法之一。本研究使用以繡球花及在地土壤建構一生物滯留系統,評估在酸性逕流下,不同進流重金屬濃度和進流體積對銅、鉛、鋅去除的影響。在實驗結束後,對植物進行消化以評估生物累積情形,並進行土壤鑽心試驗以ITRAX了解重金屬在土壤中的分佈。結果發現,酸性逕流和污染物濃度對出流濃度影響較小,但是鉛的出流濃度隨著進流體積增加而增加。植物可以增加生物滯留系統去除重金屬的能力,並且金屬累積在根中比在莖和花/葉中還多。總體而言,大部分的鉛和鋅累積在表層土壤且總去除效率極佳,達到總質量的96%以上,銅的分佈則較平均,總去除大於23%。 Heavy metals such as Cu, Pb and Zn can enter urban runoff due to intensive automobile emissions, building material weathering, agriculture activities and atmospheric depositions. Bioretention system is one of the most widely used stormwater best management practices (BMPs) for improving water quality of urban runoff. In this study, a bioretention systems consisting of Hydrangea macrophylla, local potting soil, sandy loam and gravel was constructed to investigate the impacts of inflow pH, inflow metal concentrations and inflow volume on the removal of Cu, Pb and Zn. In the end of experiments, the concentrations of metals in the plants were determined to evaluate the bioaccumulation potential. Also, the concentrations of metal in the soil were examined using ITRAX to investigate the metal distribution in the soil column. The results showed that the inflow pH and inflow metal concentration had minor influences on the outflow metal concentrations, while the outflow Pb concentration increased with the increasing inflow volume. Plants could facilitate the removal via phytoremediation and the roots accumulated more metals than the stems and flowers/leaves. Overall, the accumulation of Pb and Zn in the surface layer of soil was higher than those at deeper depths. The removal efficiencies for Pb and Zn were excellent, reaching more than 96% based on total mass. For Cu, it was found that Cu distributed relatively uniformly along the depth and the removal was more than 23%. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/70958 |
DOI: | 10.6342/NTU201802371 |
全文授權: | 有償授權 |
顯示於系所單位: | 環境工程學研究所 |
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