基于TMVOC的有机污染场地热强化气相抽提修复效果模拟
Numerical simulation of remediation effect of thermally enhanced soil vapor extraction in organic contaminated site based on TMVOC
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摘要: 为建立系统化、适用性强的有机污染场地热强化气相抽提修复模型,提高数值模型的预测精度,以天津某试剂厂中试场地为研究对象,基于TMVOC模型对场地的升温过程及目标污染物氯苯的去除过程进行模拟,并以模型温度场的时空分布规律、污染物的动态去除规律等方面的模拟数据与场地实际中试数据进行拟合,验证TMVOC模型的可信度。结果表明,模型的拟合效果较好。模拟加热7周后,TCH-A和TCH-B两个分区的平均温度分别为99.4 ℃和84.8 ℃,维持该温度持续1周后平均温度变为95 ℃和88 ℃,模拟加热过程的温升数据与实际中试数据的拟合优度值R分别为0.995、0.989;模拟热强化气相抽提修复8周后,氯苯的去除率达97.3%,第1周和第8周的去除速率最慢,第4周的去除速率最快,模拟修复后氯苯的浓度与实际中试数据的拟合优度值R为0.91,相关性良好。该模型可为有机污染场地热强化气相抽提修复技术的应用提供支撑。Abstract: To establish a systematic and applicable thermally enhanced soil vapor extraction remediation model of organic contaminated sites and improve the prediction accuracy of the numerical model, a pilot site of the reagent plant in Tianjin was taken as the research object, the heating process of the site and the removal process of the target pollutant chlorobenzene were simulated based on the TMVOC model. The simulation data of the temporal and spatial distribution of the temperature field, and the dynamic removal of chlorobenzene were fitted with the actual pilot data to verify the reliability of the TMVOC model. The results showed that the fitting effect of the model is great. After seven weeks of simulated heating, the average temperatures of TCH-A and TCH-B were 99.4 °C and 84.8 °C, respectively. Then maintaining the temperature for a week, the average temperature of the two zones changed to 95 °C and 88 °C, respectively. The fitting degree of the temperature between the simulation data and the actual pilot data are 0.995 and 0.989, respectively. The removal rate of chlorobenzene reached 97.3% after eight weeks of simulated thermally enhanced soil vapor extraction. The removal rate was the slowest in the first week and the last week, and the removal rate was the fastest in the fourth week. The fitting degree between the simulation data of chlorobenzene concentration and actual pilot data is 0.91. This model can provide support for the application of thermally enhanced soil vapor extraction remediation technology in organic contaminated sites.
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