Purpose

Thermal treatment technologies are generally very effective for the remediation of soils contaminated. For the traditional thermal treatment method of contaminated soil, the heating method from the outside to the inside will inevitably cause a waste of energy, and it may be expensive due to the energy costs. Therefore, it is necessary to find a new heating technology to improve the thermal treatment.

Materials and methods

In this study, a novel microwave coupled infrared radiation (MCIR) technology was used to achieve uniform heating treatment of contaminated soil. A mathematical model was established and applied to simulate the electric field and temperature induced by microwave radiation and MCIR.

Results and discussion

The model results showed that MCIR heating produces well uniformity of thermal field distribution. Then, the influence of infrared in the MCIR treatment of soil was investigated by the lab experiment. The lab experimental results indicated that infrared could efficiently improve the microwave treatment of soil. A toluene removal efficiency of 92.8% could be achieved at 500 W microwave coupled with 300 W infrared radiation for 300 s, retaining 9.2% soil moisture. In addition, it exhibited a high cost-benefit. Furthermore, MCIR did not destroy the structure of toluene by infrared spectrum analysis.

Conclusion

The results show that this MCIR treatment has the advantages of uniform heating, high efficiency, and low damage, which indicates the application prospect of MCIR in soil remediation.

中文翻译：

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通过微波耦合红外辐射（MCIR）的均匀加热有效地处理受甲苯污染的土壤

目的

热处理技术通常对于修复被污染的土壤非常有效。对于受污染土壤的传统热处理方法，从外到内的加热方法不可避免地会浪费能源，并且由于能源成本的原因可能会很昂贵。因此，有必要寻找一种新的加热技术来改善热处理。

材料和方法

在这项研究中，一种新颖的微波耦合红外辐射（MCIR）技术用于对受污染的土壤进行均匀的加热处理。建立了数学模型并将其应用于模拟微波辐射和MCIR感应的电场和温度。

结果与讨论

模型结果表明，MCIR加热产生的热场分布均匀。然后，通过室内实验研究了红外对土壤MCIR处理的影响。室内实验结果表明，红外线可以有效改善土壤的微波处理效果。在500 W微波结合300 W红外辐射300 s的条件下，甲苯去除效率可达到92.8％，保留了9.2％的土壤水分。另外，它显示出高的成本效益。此外，通过红外光谱分析，MCIR没有破坏甲苯的结构。

结论

结果表明，该MCIR处理具有加热均匀，效率高，损伤小等优点，说明了MCIR在土壤修复中的应用前景。