响应面法优化微波修复萘污染土壤工艺参数的研究

为了探究石油污染土壤微波修复最适宜的工艺参数,选取石油污染土壤中典型的半挥发性有机物萘（naphthalene,NAP）为目标污染物,以模拟萘污染的土壤为供试土壤,采用微波（f=2.45 GHz）对其进行修复。在单因素试验基础上,采用响应面法Box-Behnken实验设计,以NAP去除率为响应值,建立了以微波功率、辐照时间、土层厚度和土壤含水率为影响因子的二次多元回归模型。结果表明：模型经方差分析（ANOVA）结果达到极显著水平,其中微波功率的影响最为显著;得到最佳的工艺参数为微波功率768 W、辐照时间19 min、土层厚度3.2 cm、含水率16%,此条件下NAP去除率为97.3%;验证实验结果NAP去除率为97.0%,与模型预测结果仅偏差0.31%。利用响应面法优化的微波修复NAP污染土壤的工艺参数合理可行,研究结果可为微波土壤修复技术的工业化应用提供数据支持。

Optimization of microwave remediation of naphthalene contaminated soil by response surface methodology

In order to study the best technology of remediation of petroleum contaminated soil, naphthalene (NAP), a typical semi volatile organic compounds in petroleum contaminated soil was selected as the target pollutant, the simulated NAP contaminated soil was taken as the test soil, and the microwave(f=2.45 GHz) was used to restore the soil. On the basis of single factor experiment, the Box-Behnken experiment design of response surface method was adopted, and the removal rate of NAP was taken as the response value. A quadratic multiple regression model was established with microwave power, irradiation time, soil thickness and soil moisture content as the influencing factors. The ANOVA model reached a very significant level, in which the microwave power had the most significant effect. The best process parameters were obtained as follows: the wave power was 768 W, the irradiation time was 19 min, the soil thickness was 3.2 cm, the water content was 16%, and the removal rate of NAP was 97.3% under these conditions. The verification results show that the removal rate of NAP is 97.0%, which is only 0.31% different from the predicted results. The process parameters optimized by response surface methodology are reasonable and feasible, which may provide some reference for the industrial application of microwave remediation of soil.