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

薩支高(Ju-Gau Sah) ； 徐文逢(Wen-Fong Hsu)

《土壤與環境》 2卷2期 (1999/06) Pp. 171-186

https://doi.org/10.30058/SE.199906.0007

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 Lao-pi (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.

關鍵字

電動法 ； 鎘 ； 土壤

並列摘要

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 Lao-pi (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.

並列關鍵字

Electrokinetic technique ； Cd ； Soil