The removal of PAHs and Pb from soil by cyclodextrin

• Main Authors: Lai Po, 賴柏錡
• Other Authors: Chih-yu Chen
• Format: Others
• Language: zh-TW
• Published: 2005
• Online Access: http://ndltd.ncl.edu.tw/handle/22420512018076189663

碩士 === 輔英科技大學 === 環境工程與科學系碩士班 === 93 === In the past, although there were many methods to remove the organic or inorganic pollutants in the soils, there is almost no way to remove these two kinds of pollutants simultaneously. This research tries to modify the flushing agent to remove those two kinds of pollutants simultaneously. In general, acidic reagents or EDTA and surfactant are used to remediate the soil contaminated by heavy metal and organic pollutants, respectively. But these flushing agents may result in hazard to soil. Cyclodextrins without toxic effect to biology in soil, are used as the flushing agent. It was found from the flushing test that the removal efficiency of anthracene was higher than phenanthrene. We proposed that the rate of complex reaction plays an important role during the flushing processes. The time needed to approach stable complex is not the same for different pollytants. It was proposed that the formation inclusion complex for phenanthrene was faster than for anthracene. The removal efficiency of HPCD is higher than β-CD, because the HPCD possessed non-polar function group can increase the solubility of PAH in water.The soils with higher organic carbon content will retain the PAH within the soil column, and delay the elution time. Besides, the total removal efficiency of PAH from soils with higher organic carbon content is as well as the soils with low organic carbon content. The removal of lead from soil was also conducted in our research. But the result revealed that the efficiency was not good. Only when the retention time achieved 20hours, small part of lead was removed.