| 低环多环芳烃异位热脱附行为分析 |
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| 引用本文： | 陈春红,徐成华,于天,刘刚,张亚平,洪雅敏.低环多环芳烃异位热脱附行为分析[J].环境工程,2022,40(1):78-85. |
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| 作者姓名： | 陈春红 徐成华 于天 刘刚 张亚平 洪雅敏 |
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| 作者单位： | 1. 东南大学 能源与环境学院 能源热转换及其过程测控教育部重点实验室, 南京 210096; |
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| 基金项目： | 国家自然科学基金面上项目(42077126)； |
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| 摘 要： | 随着我国工业和城镇的快速发展,化石能源的大量使用使得环境中多环芳烃(PAHs)残留量不断增加,给环境和人体健康带来严重危害.以2～4环PAHs为研究对象,探讨了热脱附温度、时间以及PAHs自身结构对热脱附效果的影响,简要分析了热脱附处理对土壤性质的影响,评估了管式炉热脱附的能耗.结果表明:低环PAHs的脱附率随着脱附温...
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| 关 键 词： | 异位热脱附 低环PAHs 污染土壤 土壤修复 |
| 收稿时间： | 2021-01-14 |
EX-SITU THERMAL DESORPTION BEHAVIORS OF LOW-RINGS PAHS |
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| Affiliation: | 1. Key Laboratory of Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeat University, Nanjing 210096, China;2. Jiangsu Nanjing Geo-engineering Survey Institute, Nanjing 210041, China |
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| Abstract: | With the rapid development of China's industries and urbanization, the massive use of fossil energy has led to an increasing amount of PAHs residues in the environment, which poses serious hazards to the environment and human health. The effects of thermal desorption temperature, time and the structure of PAHs themselves on the thermal desorption were investigated with 2~4 ring PAHs. Additionally, the effect of thermal desorption on soil properties were briefly analyzed, and the energy consumption of thermal desorption in a tube furnace was also evaluated. The results showed that the desorption removal efficiency of low ring PAHs showed an increasing trend with the increase of desorption temperature and desorption time. Under the conditions of 300 ℃ and 30 min of desorption, 2 ring-PAHs was completely removed, and the removal efficiency of 3 ring-PAHs and 4 ring-PAHs was 93.22% and 83.85%, respectively. The preferred conditions for each PAHs component to meet the objective values of the remediation standard(DB11/T 811—2011) were as follows: Nap was remediated at a desorption temperature of 100 ℃ for 10 min; Phe and Ant were remediated at 250 ℃ for 30 min and 150 ℃ for 60 min, respectively; the residues of Fla and Pyr were basically higher than the standard screening values, which required further adjustment of the thermal desorption working parameters or the addition of modifiers for synergistic remediation to reduce the cost. Moreover, the proportion of coarse soil particles decreased after thermal desorption, which was consistent with the fragmentation of large particles into small particles in SEM. The results can provide theoretical references for application of thermal desorption technology in remediation of PAHs contaminated soil. |
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