宋昕1,
吕正勇2,
任家强1,3,
丁达1,3,
林娜1,
魏昌龙1,3,
扶恒4
1.中国科学院南京土壤研究所，南京 210008
2.北京高能时代环境技术股份有限公司，北京 100095
3.中国科学院大学，北京 100049
4.南京康地环保科技有限公司，南京 210008
基金项目: 中国科学院重点部署项目（KFZD-SW-303）
中国科学院科技服务网络计划（STS计划）项目（KFJ-STS-ZDTP-039）
Feasibility of thermal remediation of soil contaminated with PAHs
CHEN Xing1,,SONG Xin1,
LYU Zhengyong2,
REN Jiaqiang1,3,
DING Da1,3,
LIN Na1,
WEI Changlong1,3,
FU Heng4
1.Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
2.Beijing GeoEnviron Engineering & Technology Inc., Beijing 100095, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.Nanjing Kangdi Environmental Protection Technology Co.Ltd., Nanjing 210008, China
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摘要:以某煤制气厂污染场地中16种US EPA优先控制多环芳烃（Σ16 PAHs）为目标污染物进行了热修复批量实验和可行性实验。热修复批量实验结果表明，当热修复温度为400 ℃、加热时间为8 h时，土壤中的Σ16 PAHs去除率达99.9%。热修复可行性实验选择重污染、中污染和轻污染土壤以400 ℃作为目标温度，恒温72 h进行实验。热修复前后不同程度污染土壤的Σ16 PAHs的总去除率均可达到99.9%，但重污染土壤浓度非常高，部分苯并类物质未达到修复目标值，需进一步延长加热时间或提高加热温度保证达到修复目标值。土壤土工参数影响分析结果表明，热修复后土壤颗粒粒径呈增大趋势，土壤稳定性、抗压强度均增强。此外，土壤中可溶性盐含量增多，盐渍化程度增大。
关键词: 污染土壤/
热修复/
多环芳烃/
土工参数/
可行性实验
Abstract:Batch experiments and feasibility study of thermal remediation were conducted for soils contaminated with the US EPA 16 priority polycyclic aromatic hydrocarbons (Σ16 PAHs). The results of batch experiment indicated that the removal efficiencies of Σ16 PAHs reached 99.9% after thermal treatment for 8 h at 400 ℃. The feasibility study experiments were carried out with a target temperature with 400 ℃ for 72 h. The total removal efficiencies of Σ16 PAHs reached 99.9% as well, however, several contaminants of concern among the Σ16 PAHs concentrations exceeded the remediation cleanup values, especially those compounds in the benzo group. The soil particle size, soil stability and compressive strength increased after the thermal remediation based on the analysis between soil parameters before and after treatment. The soluble salt content increased post thermal remediation, indicating an increase in the soil salinization.
Key words:contaminated soil/
thermal remediation/
PAHs/
geo-technical properties/
feasibility experiment.
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PAHs污染土壤的热修复可行性
陈星1,,宋昕1,
吕正勇2,
任家强1,3,
丁达1,3,
林娜1,
魏昌龙1,3,
扶恒4
1.中国科学院南京土壤研究所，南京 210008
2.北京高能时代环境技术股份有限公司，北京 100095
3.中国科学院大学，北京 100049
4.南京康地环保科技有限公司，南京 210008
基金项目: 中国科学院重点部署项目（KFZD-SW-303） 中国科学院科技服务网络计划（STS计划）项目（KFJ-STS-ZDTP-039）
关键词: 污染土壤/
热修复/
多环芳烃/
土工参数/
可行性实验
摘要:以某煤制气厂污染场地中16种US EPA优先控制多环芳烃（Σ16 PAHs）为目标污染物进行了热修复批量实验和可行性实验。热修复批量实验结果表明，当热修复温度为400 ℃、加热时间为8 h时，土壤中的Σ16 PAHs去除率达99.9%。热修复可行性实验选择重污染、中污染和轻污染土壤以400 ℃作为目标温度，恒温72 h进行实验。热修复前后不同程度污染土壤的Σ16 PAHs的总去除率均可达到99.9%，但重污染土壤浓度非常高，部分苯并类物质未达到修复目标值，需进一步延长加热时间或提高加热温度保证达到修复目标值。土壤土工参数影响分析结果表明，热修复后土壤颗粒粒径呈增大趋势，土壤稳定性、抗压强度均增强。此外，土壤中可溶性盐含量增多，盐渍化程度增大。
English Abstract
Feasibility of thermal remediation of soil contaminated with PAHs
CHEN Xing1,,SONG Xin1,
LYU Zhengyong2,
REN Jiaqiang1,3,
DING Da1,3,
LIN Na1,
WEI Changlong1,3,
FU Heng4
1.Institute of Soil Science, Chinese Academy of Sciences, Nanjing 210008, China
2.Beijing GeoEnviron Engineering & Technology Inc., Beijing 100095, China
3.University of Chinese Academy of Sciences, Beijing 100049, China
4.Nanjing Kangdi Environmental Protection Technology Co.Ltd., Nanjing 210008, China
Keywords: contaminated soil/
thermal remediation/
PAHs/
geo-technical properties/
feasibility experiment
Abstract:Batch experiments and feasibility study of thermal remediation were conducted for soils contaminated with the US EPA 16 priority polycyclic aromatic hydrocarbons (Σ16 PAHs). The results of batch experiment indicated that the removal efficiencies of Σ16 PAHs reached 99.9% after thermal treatment for 8 h at 400 ℃. The feasibility study experiments were carried out with a target temperature with 400 ℃ for 72 h. The total removal efficiencies of Σ16 PAHs reached 99.9% as well, however, several contaminants of concern among the Σ16 PAHs concentrations exceeded the remediation cleanup values, especially those compounds in the benzo group. The soil particle size, soil stability and compressive strength increased after the thermal remediation based on the analysis between soil parameters before and after treatment. The soluble salt content increased post thermal remediation, indicating an increase in the soil salinization.
