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題名 | 不同因子對土壤中鎘的電動法移除效率影響=Study on the Affecting Factors of Electrokinetic Removal Efficiency of Cd in Soils |
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作者 | 薩支高; 徐文逢; Sah, Jy-gau; Hsu, Wen-fong; |
期刊 | 土壤與環境 |
出版日期 | 19990600 |
卷期 | 2:2 1999.06[民88.06] |
頁次 | 頁171-186 |
分類號 | 434.227 |
語文 | chi |
關鍵詞 | 電動法; 鎘; 土壤; Electrokinetic technique; Cd; Soil; |
中文摘要 | 本研究以電動法處理人工添加鎘模擬污染土壤(模擬鎘土),探討如處理時間、有機質、導電溶液及土壤質地等變數對電動法移除率的影響,並以大試驗槽進一步模擬現地復育效率。結果顯示老埤土(Lo)及長興土(Cs)中鎘通電 8V 後可累積於陰極處,移除率以浸於0.1 M HCl>0.01 M HCl>蒸餾水對照組;月世界土(Ysc)通電後鎘累積於距陽極3.6-7.2cm處,此處亦有紅褐色鐵化合物產生,以0.1 M HCl浸泡月世界土亦無法提高電動法移除率;添加河砂會使老埤土及長興土中鎘往陰極方向移動減緩,移除率依序為:對照組>添加10%河砂>20%>30%;添加河砂與否並未影響月世界土中鎘的移除率。添加石英砂使土壤中鎘往陰極方向移除率之大小為:對照組>添加30%石英砂>20%>10%,添加石英砂處理組的鎘移除率比河砂大。添加泥炭土因可使土壤對鎘的吸附增大,老埤土及長興土中鎘隨泥炭土添加比例增多而移除率降低;泥炭土添加對月世界土中鎘的移除效率無影響。大試驗槽試驗短期內移除率不如小槽,然在通電16V電壓180天後效果漸佳,其中以老埤土中鎘的移除率最高,月世界土最差。 |
英文摘要 | The objectives of this study are to examine the affecting factors of three Cd spiked soils' electrokinetic removal efficiency, e.g., reaction time, organic matter, conducting solution, and soil texture. A larger scale experiment is also examined herein. Cd in Laopi (Lo) and Chang-sin (Cs) soils can be accumulated at the zone near cathode after 30 days'8 V electrification. The sequence of removal efficiencies of different conducting solution soaking is as follows: 0.1 M HCl > 0.01 M HCl > contrast. Even soaking in 0.1 M HCl solutions makes no differences in Cd electrokinetic efficiency in Yueh-shih-chieh (Ysc) soil. Cd in Ysc soil can be removed only to the zone at 3.6-7.2 cm from anode. A redbrown ironic oxide appeared at the same area. River sand addition reduced the Lo and Cs soils' Cd electrokinetic removing. The order of the removal efficiencies of river sand added is as follows: contrast > 10% > 20% > 30%. Different ratios of river sand additions make no difference in Cd removal efficiency in Ysc soil. The removal efficiencies of adding quartz sand are higher than river sand. Peat moss additions make the Lo and Cs soils' Cd removal efficiency lower than that of the contrast. However, this treatment does not make difference in Ysc soil. Larger scale experiments have lower efficiency than the smaller ones in a short term. The result is better while applying 16V electric pressure after 180 days. The sequence of removal efficiency of the three soils in larger cell is as follows: Lo > Cs > Ysc soil. |
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