原位空气扰动技术在本科实验教学中的应用
按照实验设计,在一维有机玻璃模拟柱中填装一定高度固定粒径的石英砂,利用蠕动泵从柱体底部的进样口泵入一定浓度的甲苯溶液,静置一段时间后,在土柱底部利用空气泵曝气,在不同曝气时间下于柱体侧面的取样口取水样,分析甲苯的浓度变化。实验分组进行,主要考察了曝气、介质粒径和曝气方式对甲苯修复效果的影响。实验结果表明,对于0.25~0.5 mm的中砂介质,最佳曝气量为500 m L/min,曝气初期,距离曝气点最远的上部取样口处甲苯的相对浓度有短暂上升趋势,但随着曝气时间延长,所有取样口甲苯浓度均逐渐下降;相同曝气量条件下,介质粒径越大,修复效果越好;对于0.1~0.25 mm的细砂介质来说,间歇曝气方式优...
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| Published in | 实验室研究与探索 Vol. 36; no. 9; pp. 145 - 148 |
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| Main Author | |
| Format | Journal Article |
| Language | Chinese |
| Published |
吉林大学环境与资源学院,长春,130021
2017
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| Subjects | |
| Online Access | Get full text |
| ISSN | 1006-7167 |
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| Summary: | 按照实验设计,在一维有机玻璃模拟柱中填装一定高度固定粒径的石英砂,利用蠕动泵从柱体底部的进样口泵入一定浓度的甲苯溶液,静置一段时间后,在土柱底部利用空气泵曝气,在不同曝气时间下于柱体侧面的取样口取水样,分析甲苯的浓度变化。实验分组进行,主要考察了曝气、介质粒径和曝气方式对甲苯修复效果的影响。实验结果表明,对于0.25~0.5 mm的中砂介质,最佳曝气量为500 m L/min,曝气初期,距离曝气点最远的上部取样口处甲苯的相对浓度有短暂上升趋势,但随着曝气时间延长,所有取样口甲苯浓度均逐渐下降;相同曝气量条件下,介质粒径越大,修复效果越好;对于0.1~0.25 mm的细砂介质来说,间歇曝气方式优于连续曝气。以上实验结果表明,原位空气扰动修复技术能有效去除地下水中挥发性的甲苯,同时修复效果受曝气量、介质粒径和曝气方式影响。 |
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| Bibliography: | According to the experimental design, silica sand was filled into an organic glass simulation column with certain height, toluene solution was injected into the column by peristaltic pump from the bottom. After a period of time, aeration by air pump was carried out in the bottom injection port of the soil column. Toluene concentration was analyzed in different aeration time and different sample connection. Experimental group tested the influences of aeration rate, medium size and aeration patterns on the remediation effect. The experimental results indicate that the optimal aeration rate is 500 mL/min for 0.25-0.5 mm sand size. Toluene concentration in the upper sample point has a brief rise trend in the early aeration, but with extended aeration time, all sampling mouth toluene concentration gradually decreases. The bigger of the medium size, the better of toluene remediation effect. For 0.1-0.25 mm of the fine sand medium, intermittent aeration mode is better than that of continuous aeration. The above expe |
| ISSN: | 1006-7167 |