热修复过程中重质非水相液体(DNAPL)共沸实验

本研究开展单组分和多组分DNAPL加热实验，旨在建立热处理过程中温度与DNAPL去除之间的联系.结果表明，单组分DNAPL实验中可以观察到明显的共沸温度平台，而多组分DNAPL实验则是一段温度逐渐上升的共沸区域，两组实验中共沸时间均与初始DNAPL饱和度呈正相关.仅根据局部温度数据判断热修复进程可能会导致错误的结论，当温度结果显示共沸结束后，体系内仍残留有饱和度0.94%~1.60%的DNAPL.温度数据会受到DNAPL组成和温度监测点位置影响，它通常仅能反映局部加热情况，修复时可结合气体和土壤样品中污染物组分变化情况辅助判断修复进程.

Laboratory study on dense non-aqueous phase liquid co-boiling during thermal remediation

In this study, single-component and multi-component DNAPL thermal remediation experiments were carried out to establish the relationship between temperature and DNAPL removal. In the single-component DNAPL experiments, an obvious temperature plateau was observed, while the co-boiling region showed a stage of gradually increasing temperature in the multi-component DNAPL experiments. The co-boiling duration was positively correlated with the initial DNAPL saturation in both experiments. The remediation process can be inaccurately interpreted from local-scale temperature measurements, and 0.94% to 1.60% DNAPL saturation remained in the jar after the end of observed co-boiling. Temperature measurement can be affected by DNAPL saturation, DNAPL composition and the location of thermocouples, and it can only reflect the local heating stage. The change of the components in gas and soil samples can help evaluate the remediation process during thermal remediation.