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標題: | 以混合式活性覆蓋材料整治受多重潛在毒性金屬污染底泥以降低環境風險之研究 Using Mixed Active Capping to Remediate Multiple Potential Toxic Metal Contaminated Sediment for Reducing Environmental Risk |
作者: | Meng-Yuan Ou 歐夢圓 |
指導教授: | 席行正(Hsing-Cheng Hsi) |
關鍵字: | 活性覆蓋法,有毒金屬,底泥,現地整治,廢棄物再生材料, active capping,toxic metal,sediment,in-situ remediation,recycled materials, |
出版年 : | 2020 |
學位: | 碩士 |
摘要: | 人類長期之工業化活動,使得含重金屬之廢水排放在全球造成嚴重的污染問題。底泥作為排入河川之污染物的主要匯集地,往往出現多種超過底泥品質標準限值之污染物,因此開發整治受多重重金屬污染底泥之技術有其必要性。近年來,在污染底泥上鋪設活性材料覆蓋層逐漸被認可為一種經濟有效的現地整治方式,這種整治方式通過減少底泥中污染物向上層水體的釋出,可有效減少潛在污染物對於人體和生態環境的風險。 本研究主要分為兩個部分。其一為水相批次實驗,探討五種材料各自之捕獲五種重金屬的效能。在實驗中以普遍存在於污染底泥中的Cu,Cr,Zn,Ni和Hg為重點研究對象,並根據已有的研究選用碳黑材料,高嶺土,硫化亞鐵,牡蠣殼粉及氫氧基磷灰石作為具有理想潛力的整治材料。研究的第二部分利用微環境系統,模擬真實自然環境下不同的混合式覆蓋層的應用對於抑制多重重金屬之可行性,抑制能力與穩定性。覆蓋層材料的混合比例以第一部分水相吸附實驗之結果為依據。 水相吸附實驗結果顯示,對於Cu,Cr,Zn和Ni來說,氫氧基磷灰石與牡蠣殼粉總體而言呈現最佳的吸附效果,碳黑材料的吸附效果次之;而對於Hg來說,硫化亞鐵和碳黑是最佳的吸附材料。在第二部分的擬環境系統實驗中,以碳黑材料主要作為穩定汞的材料,氫氧基磷灰石與牡蠣殼粉為主要比重的覆蓋層在長期來說對五種金屬及甲基汞的釋出起到最佳的抑制作用。 本研究提供了一種通過合理分配不同吸附材比重來達到有效整治多重污染環境的方法,當應用於實場時,覆蓋層的材料混合比例可根據實際廠址的特點、當地污染物的特性及整治目標做調整,以達到底泥實場整治的最大效益。 As a result of long-term anthropogenic activities, potential toxic metal contaminated wastewater has caused severe pollution globally. Sediments act as the major sinks of contaminants entering into river, resulting in multi-pollutants with concentrations exceeding the limit of guidelines. Recently, capping the contaminated sediments with active materials becomes an economical and effective in-situ remediation choice for lowering the release content of potential toxic metals to overlying water, reducing the potential risks presented to human health and ecological system. This research is divided into two parts. The first part is the aqueous batch experiments using five adsorbents to capture the five potential toxic metals individually at various concentrations. We focused on investigating the different effectiveness of various adsorbents for capturing Cu, Cr, Zn, Ni and Hg existing in sediments. Kaolinite, carbon black (CB), iron sulfide (FeS), hydroxyapatite (HAP), and oyster shell powder (OSP) were selected as potentially ideal amendments based on previous researches. In the second part, a laboratory-scale, in-situ treatment was conducted by modified six-column microcosm to evaluate the feasibility, inhibition, and stability of different mixed active capping. Five mixing ratios based on various considerations using the five adsorbent materials were tested; the water samples were collected and analyzed every week for 135 days. In aqueous batch experiments, HAP and OSP showed the largest removal efficiencies towards Ni (OSP: 76.47%), Cr (OSP: 100.00%), Cu (HAP: 98.39%), and Zn (HAP: 64.56%), with CB taking the third place. In contrast, FeS and CB played a more significant role in Hg removal (FeS: 100.00%; CB: 86.40%). In the modified six-column microcosm experiments, results s howed that capping containing CB could immobilize the release of Hg and methylmercury (MeHg) better than that by FeS. More economical design, namely, with higher portion of OSP in the mixed capping, could not reach comparable effects to those with more HAP for immobilizing Ni, but performed almost the same for the other four metals. All columns with active capping showed greater metal immobilization as compared to the controlled column without capping. I suggest that when applied to the actual field, the ratio of mixing materials should be adjusted based on the adequate evaluation of site specifications, risks, and remediation goals. It is expected that this technology could be further scaled up in remediation of multi-contaminated sediments. |
URI: | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/58406 |
DOI: | 10.6342/NTU202001479 |
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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