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

作　　者：孙超 徐超 孙宗全 沈佳伦 龙杰 李晓东[2] 马福俊[2] 谷庆宝[2] SUN Chao;XU Chao;SUN Zongquan;SHEN Jialun;LONG Jie;LI Xiaodong;MA Fujun;GU Qingbao(College of Environment,Zhejiang University of Technology,Hangzhou 310014,China;State Key Laboratory of Environmental Criteria and Risk Assessment,Chinese Research Academy of Environmental Sciences,Beijing 100012,China)

机构地区：[1]浙江工业大学环境学院,浙江杭州310014 [2]中国环境科学研究院,环境基准与风险评估国家重点实验室,北京100012

出　　处：《环境科学研究》2023年第1期198-207,共10页Research of Environmental Sciences

基　　金：国家重点研发计划项目(No.2019YFC1803800)。

摘　　要：热强化气相抽提技术因其修复周期短、二次污染可控以及对土壤质地和污染物性质适应性较强等优势,被广泛应用于有机污染场地修复,但目前国内外关于该技术的数值模拟研究较少. TMVOC模型可模拟多孔介质的热量传递及污染物的运移、去除过程.为建立系统化、精准化的有机污染场地热强化气相抽提修复模型,探究有机污染场地热强化气相抽提修复过程,提高热强化气相抽提技术的治理精度,以天津某试剂厂中试场地为研究对象,采用TMVOC模型模拟原位热传导(TCH)强化气相抽提过程中场地的温度变化及目标污染物氯苯的去除效果,结合中试数据进一步阐明场地升温过程及氯苯的去除规律,并验证TMVOC模型的可信度.结果表明:(1)模拟加热7周后,TCH-A区的平均温度为99.4℃,维持该温度1周后平均温度降为95.0℃,升温过程温度监测数据模拟值与试验值的拟合优度R为0.995.(2)模拟加热7周后,TCH-B区的平均温度为84.8℃,维持该温度1周后平均温度升至88.0℃,升温过程温度监测数据模拟值与试验值的拟合优度R为0.989.(3)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周的去除速率最慢,第4周最快,修复后氯苯浓度模拟值与试验值的拟合优度R为0.910.研究显示,TMVOC模型可有效模拟热强化气相抽提过程中场地温度和污染物的变化规律,为有机污染场地热强化气相抽提技术的精准化修复提供支撑.Thermally enhanced soil vapor extraction has been widely used in the remediation of organic contaminated sites because of its short remediation period, controllable secondary pollution, and strong adaptability to soil texture and pollutant properties. However, there are few research on numerical simulation of this technology. The TMVOC model can simulate heat transfer and pollutant migration and removal processes in porous media. Establishing a systematic and accurate remediation model to study the remediation process of organic contaminated sites by thermally enhanced soil vapor extraction will improve accurate remediation of thermally enhanced soil vapor extraction. A pilot site of reagent factory in Tianjin was taken as the research object. The temperature change of the site and the removal effect of the target pollutant chlorobenzene in the in-situ heat conduction(TCH) enhanced soil vapor extraction were simulated by the TMVOC model to clarify the process of heating of contaminated site and chlorobenzene removal combined with the pilot experimental values, and to verify the reliability of the TMVOC model. The results showed that:(1) After seven weeks of simulated heating, the average temperature of the TCH-A area was 99.4℃. The temperature maintained for a week, the average temperature decreased to 95.0℃. The fitting degree of the temperature between the simulation values and the experimental values was 0.995.(2) After seven weeks of simulated heating, the average temperature of the TCH-B area was 84.8℃. Then the temperature was maintained for a week, the average temperature increased to 88.0℃. The fitting degree of temperature between the simulation values and the experimental values was 0.989.(3) The simulated removal efficiency of chlorobenzene reached 97.3% after eight weeks. The removal rate was the slowest in the first week and the fastest in the fourth week. The fitting degree of chlorobenzene concentration after remediation between the simulated and experimental values was 0.910. This research

关 键 词：有机污染场地 热强化气相抽提 TMVOC模型 温度场 氯苯 

分 类 号：X526[环境科学与工程—环境工程]