2020-01-302024-05-14https://scholars.lib.ntu.edu.tw/handle/123456789/656599摘要：重金屬污染為全球面臨的環境隱憂。河川底泥不僅為重金屬污染物之累積終點，亦為潛在的污染物釋出來源，最終可能危害水中生物或人體健康。由行政院環保署的歷年調查結果得知，臺灣許多重要的河川底泥含有不同程度的重金屬污染物，部分重金屬污染物甚至超過底泥品質指標上限值。為達成土壤及地下水資源之永續利用，改善臺灣河川底泥品質為重要的課題。然而現行整治技術受限於費用昂貴、所需時程長、技術尚未成熟及適用範圍等缺點。因此發展低成本、高效率且對環境友善之整治技術仍為重要的課題。 本研究計畫初步以老街溪重金屬污染底泥及二仁溪重金屬污染底泥為例，藉由結合生物淋洗(bioleaching)及生物吸附(biosorption)方法，探討重金屬污染底泥整治之可行性，包含以下研究目標：(1) 利用自陽明山硫磺谷分離出之嗜酸硫氧化菌株SV5淋洗重金屬污染底泥，瞭解不同重金屬之釋出情形並探討最佳淋洗條件；(2) 利用序列萃取法分析生物淋洗前後，重金屬污染底泥中不同形態重金屬含量變化；(3) 利用咖啡渣進一步吸附淋洗液之重金屬，探討不同重金屬的移除效率並獲得最佳吸附條件。 本研究計畫透過瞭解結合生物淋洗法及生物吸附法整治重金屬污染底泥之可行性，期能建立符合經濟效益及有效之整治技術，期望降低河川底泥重金屬對環境之衝擊。本研究將協助完善河川底泥整治方法，研究結果期能為環保署提供河川底泥污染整治之參考依據及可行性。 <br> Abstract: Heavy metal pollution is a global environmental concern. Sediment is not only the ul-timate sink for heavy metal pollutants, but also the potential source for the re-release of pol-lutants, thereby posing potential risks to aquatic organisms or human health. Recent EPA re-ports have shown that various levels of heavy metal pollutants contaminated several major rivers sediments in Taiwan and some heavy metal contaminants exceeded the upper limits of sediment quality guideline. In order to sustain the use of soil and groundwater resources, it is important to improve the quality of sediments for the rivers in Taiwan. However, there are several limitations for current remediation technologies, including high cost, long pro-cess time, unrefined technology, and limited applications. Therefore, development of a low cost, high efficiency, and environment friendly remediation technologies is an important is-sue. This research project proposes to remediate heavy metals contaminated sediments from Laojie River and Erren River as a case study using a combined strategy with bioleaching and biosorption. The specific aims are: (1) using an acidophilic sulfur-oxidizing bacterium (SV5) isolated from Sulfur Valley near Yangmingshan to bioleach heavy metals from con-taminated sediments and analyze the optimal condition for bioleaching; (2) using sequential extraction to analyze concentrations and distribution of heavy metals in the contaminated sediments before and after the bioleaching process; and (3) using coffee grounds to biosorpt heavy metals in eluent from the bioleaching process and analyze the removal efficiency and optimal condition for biosorption. This research project aims to establish a feasible strategy to remediate heavy metals contaminated sediments by combining bioleaching and biosorption methods. We expect to establish a remediation technology for heavy metals contaminated sediments with low cost and efficiency as well as low environmental impacts. We hope the results from this study will help Taiwan EPA to define appropriate sediment remediation protocols to improve sed-iment quality.重金屬底泥生物整治heavy metalssedimentbioremediation