| 气相抽提法(SVE)去除土壤中挥发性有机污染物的实验研究 |
| 摘要点击 4608 全文点击 3274 投稿时间：2010-05-09 修订日期：2010-10-06 |
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| 中文关键词 气相抽提 土壤修复 挥发性有机物 去除率 饱和蒸气压 甲苯 乙苯 丙苯 |
| 英文关键词 soil vapor extraction (SVE) soil remediation volatile organic compounds (VOCs) removal rate saturated vapor pressure toluene ethylbenzene n-propylbenzene |
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| 中文摘要 |
| 研究了土柱直径、土壤粒径和不同污染物等对模拟SVE通风效率的影响. 以苯、甲苯、乙苯、正丙苯为污染物进行的实验结果表明，柱底面积/装土高度（S/H）越大，去除率越高. 不同粒径受甲苯、乙苯、正丙苯污染的土壤进行的实验结果表明，当土壤粒径由10目变为20～40目后，SVE通风效率降低，污染物去除难度增大. 受苯、甲苯、乙苯污染土壤在不同通风流量条件下的实验结果表明，在通风总时间96 h条件下，通风流量为0.10 L·min-1时即能将污染物基本去除，苯、甲苯、乙苯分别在12、18、48 h内进入拖尾期，TVOCs去除率达到99.52%. 实验还表明，苯环上碳原子数越多，饱和蒸气压降低，挥发性减弱，导致污染土壤难以净化，饱和蒸气压低的正丙苯对土壤中甲苯、乙苯脱附和挥发的阻碍作用明显，VOCs的分子结构和性质也是影响污染物去除效率的重要因素. |
| 英文摘要 |
| An experiment study has been carried out to investigate effects of the diameter of soil columns,the size of soil particulate and different contaminants on efficiency of simulated soil vapor extraction (SVE). Experiments with benzene,toluene,ethylbenzene and n-propylbenzene contaminated soils showed that larger bottom area/soil height (S/H) of the columns led to higher efficiency on removal of contaminants. Experiments with contaminated soils of different particulate size showed that the efficiency of SVE decreased with increases in soil particulate size,from 10 mesh to between 20 mesh and 40 mesh and removal of contaminants in soils became more difficult. Experiments with contaminated soils under different ventilation rates suggested that soil vapor extraction at a ventilation rate of 0.10 L·min-1 can roughly remove most contaminants from the soils. Decreasing of contaminants in soils entered tailing stages after 12 h,18 h and 48 h for benzene,toluene and ethylbenzene,respectively. Removal rate of TVOCs(Total VOCs) reached a level as high as 99.52%. The results of the experiment have indicated that molecule structure and properties of the VOCs are also important factors which have effects on removal rates of the contaminants. Increases in carbon number on the benzene ring,decreases in vapor pressure and volatile capability resulted in higher difficulties in soil decontamination. n-propylbenzene has a lower vapor pressure than toluene and ethylbenzene which led to a significant retard effect on desorption and volatilization of benzene and ethylbenzene. |
