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完整後設資料紀錄
DC 欄位 | 值 | 語言 |
---|---|---|
dc.contributor.advisor | 席行正 | |
dc.contributor.author | Boon-Lek Ch’ng | en |
dc.contributor.author | 莊文歷 | zh_TW |
dc.date.accessioned | 2021-06-17T08:12:32Z | - |
dc.date.available | 2024-08-18 | |
dc.date.copyright | 2019-08-18 | |
dc.date.issued | 2019 | |
dc.date.submitted | 2019-08-15 | |
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dc.identifier.uri | http://tdr.lib.ntu.edu.tw/jspui/handle/123456789/73875 | - |
dc.description.abstract | 工業時代興起,人為排放廢水使得底泥受到污染的問題日益嚴重。現地薄層覆蓋法為現今較為新穎之污染底泥整治技術。本研究目的分為兩部分: (1)水相吸附實驗中探討材料及環境因子對汞之去除效率, (2)微型系統模擬活性材料對汞污染底泥之整治。在水相吸附實驗中,活性碳、含硫活性碳及硫化亞鐵對於汞之去除具有相當程度之效用。在不同鹽度的條件下,發現AC及SAC對於汞之去除率隨著鹽度的增加而提升,FeS對於汞之去除受鹽度之影響甚低。三種材料對汞之去除效果為FeS最佳, SAC次之及AC最低。在鹽度及溶解性有機碳(DOM)條件下,三種材料對於汞之去除效果皆受到不同程度之影響。簡言之,在DOM之作用下材料對於汞之去除效率都有降低的趨勢。DOM可與汞錯合,不利於材料之吸附,且DOM帶有硫醇官能基,可與汞結合形成穩定的型態。微型系統實驗中,材料添加量不足以抑制汞的釋出,因此材料對於總汞去除效果不顯著。在淡水體系統中,材料對於甲基汞去除之效果顯著;在河口水體系中,則效果不明顯。對照組甲基汞產生量為0.10−0.14 ng/L 遠低於淡水體系之對照組2.26−11.35 ng/L。SAC及FeS作為活性材料添加至微型系統中,其甲基汞抑制效果都略低於AC。綜上所述,水相吸附實驗中, FeS對汞之去除效率最佳,且對於鹽度的抗性良好,及受DOM的影響較小;微型系統中,三種材料均適合作為活性覆蓋材料,其中以AC為最佳甲基汞吸附材料,惟SAC及FeS選用需再考慮。 | zh_TW |
dc.description.abstract | To date, the thin layer cap is the modern strategy on contaminated sediment remediation. This study is aimed to investigate (1) the Hg removal efficiency of various type sorbents influenced by various environmental factors and (2) the effect of thin layer cap on Hg-contaminated sediment remediation via microcosm experiments. In the aqueous batch experiments, the Hg removal efficiencies of activated carbon (AC), sulfurized activated carbon (SAC), and iron sulfide (FeS) were all remarkable. With the presence of salinity, the Hg removal efficiency of AC and SAC showed an increase as the salinity levels increased, however, the Hg removal ability of FeS was only slightly affected in all salinity levels tested. The performance of sorbents for Hg removal in different salinity levels from highest to lowest was: FeS, SAC, and AC. The ability of sorbents to remove Hg was also affected to varying degrees by the presence of dissolved organic matter (DOM). In general, DOM tended to reduce Hg removal efficiency of sorbents. The complexation of DOM and Hg was not conducive to sorbents’ sorption because DOM contained thiol groups that may react with Hg to form stable complexes. In the microcosms system, the amount of sorbents addition was poor capable on Hg removal, thus the Hg removal of sorbents were shown to be less significant in the closed circulation flow. Nevertheless, in the freshwater system, the MeHg removal ability of sorbents was greater than that in the estuary system. Nevertheless, the production of MeHg in the estuary system (0.10−0.14 ng/L) was far lesser than that in the freshwater system (2.26−11.35 ng/L) when compared with no capped microcosms in both freshwater system and estuary system.. The MeHg inhibitory effects of SAC and FeS were slightly lower than that by AC. Overall, FeS showed the best Hg removal efficiency, resistance to salinity, and slightly affected by DOM in aqueous adsorption experiments. In contrast, in the microcosms, AC was shown to be the best MeHg adsorption material. | en |
dc.description.provenance | Made available in DSpace on 2021-06-17T08:12:32Z (GMT). No. of bitstreams: 1 ntu-108-R06541135-1.pdf: 3689913 bytes, checksum: 5900d00bc2e35dce3fa9e6d6503af280 (MD5) Previous issue date: 2019 | en |
dc.description.tableofcontents | 誌謝 I
中文摘要 II Abstract IV Chapter 1. Introduction 1 1.1. Motivation 1 1.2. Research objective 2 Chapter 2. Literature Review 4 2.1. Mercury contamination 4 2.1.1. Properties and chemical forms of mercury 4 2.1.2. Sources of mercury and cycling in the environment 5 2.1.2.1. Natural sources of mercury 6 2.1.2.2. Anthropogenic sources of mercury emissions 7 2.2. Remediation of mercury-contaminated sediment 7 2.2.1. Approach and criteria 7 2.2.2. Remediation methods 9 2.2.3. Thin layer capping and potential 10 2.2.4. Sorbent with potential usage 10 2.3. Biogeochemical factors of mercury in aquatic and sediment 12 Chapter 3. Materials and Methods 15 3.1. Experimental design 15 3.2. Analytical instruments, experimental apparatus, and chemical reagents 17 3.3. Materials 20 3.3.1. Sorbents 20 3.4. Physicochemical properties of materials 21 3.4.1. Physicochemical properties of sorbents 21 3.4.1.1. Specific surface area, pore volumes and pore distribution (BET) 21 3.4.2. Physicochemical properties of sediment 22 3.4.2.1. Water content 22 3.4.2.2. pH value 23 3.4.2.3. Soil texture 23 3.4.2.4. Organic carbon 24 3.4.2.5. Cation exchange capacity (CEC) 24 3.5. Aqueous adsorption batch experiment 26 3.5.1. Effect of sorbent dosage 27 3.5.2. Effect of initial Hg2+ concentration 27 3.5.3. Effect of salinity (artificial waters) 27 3.5.4. Effect of DOM 29 3.6. Laboratory microcosms 29 3.6.1. Microcosm design 29 3.6.2. Sampling and water chemistry analysis 31 Chapter 4. Results and Discussion 33 4.1. Physicochemical properties of sorbents 33 4.2. Physicochemical properties of sediments 34 4.3. Aqueous adsorption batch experiment 37 4.3.1. The effects of the sorbent dosage 37 4.3.2. Effect of the initial concentration of Hg2+ 39 4.3.3. Effect of salinity 40 4.3.4. Effect of DOM on Hg2+ sorption in various salinity levels 42 4.4. Laboratory microcosms experiment 45 4.4.1. Microcosms operation 45 4.4.2. DOM and total Fe in the overlying water 50 4.4.3. Sequestration of aqueous THg and MeHg by thin layer capping 52 Chapter 5. Conclusions and Recommendations 61 5.1. Conclusions 61 5.2. Recommendations 62 References 64 | |
dc.language.iso | en | |
dc.title | 薄層覆蓋法應用於出海口底泥汞及甲基汞封存之研究 | zh_TW |
dc.title | Sequestration of Mercury and Methylmercury in Contaminated Estuary-Sediment by a Thin Layer Cap | en |
dc.type | Thesis | |
dc.date.schoolyear | 107-2 | |
dc.description.degree | 碩士 | |
dc.contributor.oralexamcommittee | 林居慶,范致豪,許正一 | |
dc.subject.keyword | 汞,甲基汞,鹽度,底泥整治,薄層覆蓋法, | zh_TW |
dc.subject.keyword | mercury,methylmercury,salinity,sediment remediation,thin layer cap, | en |
dc.relation.page | 76 | |
dc.identifier.doi | 10.6342/NTU201903646 | |
dc.rights.note | 有償授權 | |
dc.date.accepted | 2019-08-15 | |
dc.contributor.author-college | 工學院 | zh_TW |
dc.contributor.author-dept | 環境工程學研究所 | zh_TW |
顯示於系所單位: | 環境工程學研究所 |
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