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化工学报  2014 

载气流量及升温速率对污染土壤中多氯联苯热脱附的影响

DOI: 10.3969/j.issn.0438-1157.2014.06.041, PP. 2256-2263

Keywords: 热脱附,载气流量,停留时间,升温速率,多氯联苯,二英,热降解

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Abstract:

利用小型管式炉进行了载气流量和升温速率对多氯联苯污染土壤的热脱附过程影响的实验研究。结果表明流量的增大对多氯联苯含量和毒性当量的去除效率影响不大,载气流量小于400ml·min-1时,气相中的脱附量明显增大,载气流量大于400ml·min-1则脱附量变化较小,而多氯联苯的毒性当量则随着载气流量增大呈线性增加趋势。实验结果还表明污染土壤中多氯联苯变化速率与升温速率呈明显的正线性相关,随着升温速率增加,污染土壤中多氯联苯去除效率总体呈上升趋势,毒性当量去除效率降低。总体结果分析可以看到升温速率越大,总体效果也越好。污染土壤经热脱附处理后气固相的二英毒性当量则有不同程度提升,尤其气相内检测到了大量多氯二苯并呋喃生成。

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