原油污染土壤的颗粒活性炭增强微波热修复研究  

Microwave Thermal Remediation of Soil Contaminated with Crude Oil Enhanced by Granular Activated Carbon

作　　者：李大伟[1] 张耀斌[1] 全燮[1] 赵雅芝[1] 

机构地区：[1]大连理工大学环境与生命学院,工业生态与环境工程教育部重点实验室,大连116023

出　　处：《环境科学》2009年第2期557-562,共6页Environmental Science

基　　金：国家重点基础研究发展规划(973)项目(2004CB418504)

摘　　要：利用微波加热技术的加热速度快、内外同时加热及选择性加热特点,快速修复原油污染土壤并将污染油有效回收.在污染土壤中加入一定量的强微波吸收体——颗粒活性炭,提高土壤体系利用微波的能力,使土壤在微波场中加热到较高温度,从而去除污染油并将其在冷凝装置中冷凝回收.考察了相关参数对修复效果的影响及污染油的回收情况.结果表明,在颗粒活性炭剂量(质量分数)为10.0%、微波功率为800W、系统压力为0.08MPa、载气流速为150mL·min-1条件下,该修复方法可在15min内将土壤中污染油去除99%以上;同时将91%左右的污染油回收,与初始污染油相比,回收油的化学组成没有明显变化.此外,研究结果显示,颗粒活性炭可重复用于增强微波热修复污染土壤且重复使用中其增强能力基本不变.The advantage of rapid, selective and simultaneous heating of microwave heating technology was taken to remediate the crude oilcontaminated soil rapidly and to recover the oil contaminant efficiently. The contaminated soil was processed in the microwave field with addition of granular activated carbon （GAC）, which was used as strong microwave absorber to enhance microwave heating of the soil mixture to remove the oil contaminant and recover it by a condensation system. The influences of some process parameters on the removal of the oil contaminant and the oil recovery in the remediation process were investigated. The results revealed that, under the condition of 10.0% GAC, 800 W microwave power,0.08 MPa absolute pressure and 150 mL· min^-1 carrier gas （N2） flow-rate, more than 99% oil removal could be obtained within 15 min using this microwave thermal remediation enhanced by GAC; at the same time, about 91% of the oil contaminant could be recovered without significant changes in chemical composition. In addition, the experiment results showed that GAC can be reused in enhancing microwave heating of soil without changing its enhancement efficiency obviously.

关 键 词：污染土壤 原油 微波 修复 颗粒活性炭 

分 类 号：X53[环境科学与工程—环境工程]