电阻加热修复佳乐麝香污染土壤的工艺优化

佳乐麝香(Galaxolide，HHCB)是土壤中的一种新兴的半挥发性有机污染物，具有较高的毒性，需修复治理。电阻加热技术(electrical resistance heating，ERH)因加热均匀、效果好，逐渐被应用于有机污染土壤修复工程。采用自主研制的电阻加热装置，研究了加热过程中电场强度、土壤含水率和土壤粒径等因素对土壤HHCB去除效果的影响，并采用响应面法对工艺参数进行了优化。结果表明，土壤 HHCB去除率随电场强度和含水率的增大先增加后减小，随土壤粒径的增大而增大；在土壤含水率为40%、土壤粒径1~2 mm和电场强度12 V·cm⁻¹的条件下，加热6 h，HHCB去除效果最好，去除率达到了81.35%。通过响应曲面模拟优化得到的最佳工艺参数条件为，含水率39.07%、土壤粒径2.92 mm、电场强度12.64 V·cm⁻¹，在此条件下土壤HHCB的去除率为86.43%；在本实验条件下，3个因素对土壤HHCB去除率的影响为：含水率>土壤粒径>电场强度。本研究结果可为多环麝香污染土壤的修复提供参考。

Optimization of Response Surface Process for Remediation of Galaxolide Contaminated Soil by Electric Resistance Heating

Galaxolide(HHCB) is an emerging semi-volatile organic pollutant in soil, it has high toxicity and therefore needs remediation. Due to its high efficiency in achieving homogeneous soil heating, electrical resistance heating (ERH) technology has been more and more applied in organic polluted soil remediation. In this paper, the influence of electric field intensity, water content, and soil particle size on the ERH removal efficiency of HHCB was investigated using a self-made device, the operation parameters were optimized following the response surface methodology. The results showed that HHCB removal rate first increased and then decreased with the increment of electric field intensity and water content, and increased with the increase of soil particle size. Best removal rate 81.35% was achieved after ERH treatment for 6 h, under the conditions of soil water content 40%, soil particle size of 1~2 mm, and electric field intensity of 12 V·cm-1. The utilized parameters obtained by response surface simulation were as following: water content 39.07%, soil particle size 2.92 mm, and electric field intensity 12.64 V·cm-1, the estimated removal rate of HHCB was 86.43%. Under the experimental conditions, the effects of the three factors on the ERH removal rate of HHCB were as following: water content > soil particle size > electric field intensity. These results provide a new approach for polycyclic musk contaminated soil remediation.