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題 名 | 由鎘及鉛存在形態來探討萃取法及電動法土壤復育效率=Affection of Cd and Pb Formal Distribution of Contaminated Soil on Chemical Extraction and Electrokinetic Remediation |
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作 者 | 薩支高; | 書刊名 | 技術學刊 |
卷 期 | 13:4 1998.12[民87.12] |
頁 次 | 頁641-646 |
分類號 | 434.227 |
關鍵詞 | 電動法; 萃取法; 重金屬形態分佈; Electrokinetic remediation; Chemical extraction; Heavy metal formal distribution; |
語 文 | 中文(Chinese) |
中文摘要 | 本研究採集觀音鄉長期被鎘及鉛污染的現地土壤及人工製備污染土壤為材料,以 鎘及鉛聯結形態分析來探討受污染土壤採萃取法及電動法復育的可行性。試驗結果顯示人工 製備污染土壤中鎘及鉛因大多屬低能鍵結的交換態及碳酸態,而現地受污染土壤中的鎘及鉛 則因與土壤作用時間較長, 多由弱鍵結轉為強鍵結, 屬於較高能鍵結的鐵錳氧化態。 以 0.1M 鹽酸及重金屬╱螫合劑莫耳比為 1:5 的 EDTA 溶液萃取土壤後,人工製備污染土壤中 的鎘及鉛萃取效率皆大於現地受污染土壤,利用化學萃取方法整治污染土壤須考慮到作用時 間與形態變化間的影響。 電動法主要控制參數為通以 8 伏特直流電持續 5 天、10 天、30 天及 120 天,土壤中鉛及鎘的萃取效率及形態差異被用以解釋其移動現象。 對受污染現地 土壤及人工鎘土經短時間通電後,其中鎘的移除效率略有差異,此為形態分佈不同所致。長 時間通電對受污染現地土壤中鎘的移除效率有明顯的效果,陽極附近的土壤中鎘可完全被移 除,由此而知土壤中非殘餘態鎘的原始分佈對電動法復育效率並無直接關係。電動法對土壤 中鉛的移除效率則不明顯,此與鉛在土壤中移動性低有關。通電時間增長會產生電阻極化現 象,改善電阻極化應可增加電動法復育的效率。 |
英文摘要 | Soil samples from a well-known Cd and Pb contaminated site at Kuan-In Village, Taoyuan County, Taiwan were studied. Cadmium and Pb spiked soils were also compared. The sequential extracting procedure (SEP) was applied to investigate the formal distribution of Cd and Pb to determine the possibility of electrokinetic (EK) remediation and chemical extraction. Cadmium and Pb in spiked soil mainly existed in exchangeable and carbonate forms, which are less stable forms. Since the site had been contaminated for many years, the Cd and Pb in the contaminated soil mainly existed in Fe-Mn oxide forms, which are moderately stable. By extracting with 0.1 M HCl or EDTA, Cd and Pb in spiked soil can be more easily removed than from soil from the contaminated site. Long-term EK process resulted in a good Cd removing effect from both spiked and contaminated soils. Cadmium in the soil zone far from the cathode can be completely removed, which means Cd formal distribution doesn't influence the efficiency of the EK process. However, the EK process could not successfully remove Pb from both types of soil. Elongation of the electrification was found to induce resistance polarization. Avoiding this polarization by adjusting some soil characteristics might improve EK efficiency. |
本系統中英文摘要資訊取自各篇刊載內容。