| 载气含氧量及污染物浓度对土壤石油烃热脱附效率的影响 |
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| 引用本文： | 王殿二, 李方洲, 高国龙, 徐新, 张亚平, 陈春红, 李国波. 载气含氧量及污染物浓度对土壤石油烃热脱附效率的影响[J]. 环境工程学报, 2020, 14(7): 1894-1902. doi: 10.12030/j.cjee.201912061 |
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| 作者姓名： | 王殿二 李方洲 高国龙 徐新 张亚平 陈春红 李国波 |
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| 作者单位： | 1.光大环境修复(江苏)有限公司，南京 211100; 2.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： | 江苏省环境工程重点实验室科研开放基金(KF2018002) |
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| 摘 要： | 石油烃(TPHs)在土壤中难以降解，并具有生物毒性，异位热脱附(ESTD)在修复石油烃污染土壤方面极具应用潜力。采用实验室模拟异位热脱附装置，研究了热脱附载气含氧量及土壤石油烃污染浓度对可萃取石油烃(EPHs)中柴油段(DRO)和重油段(ORO)的5种组分去除率的影响。结果表明：在初始浓度为5 000~20 000 mg·kg−1时，在20 min内的脱附率均不超过50%；当初始浓度增加到40 000 mg·kg−1、脱附时间为20 min时脱附率可以达到68.2%。热脱附时间为50 min时，40 000 mg·kg−1污染土壤的残余浓度为407.1 mg·kg−1。DOR组分相同时间的脱附率随污染浓度的升高而升高，ORO组分在50 min之内不能完全脱附，脱附率随着污染物浓度上升会出现先增大后减小的趋势。在250 ℃时，DRO中3个组分的去除率均随着气氛含氧量的增加而呈现明显的增长趋势。在400 ℃条件下，ORO中2个组分分别在含氧量为12%和15%时达到最高的去除率。本研究结果可为ESTD技术修复不同浓度的石油烃污染土壤的工程设计参数提供参考。
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| 关 键 词： | 异位热脱附 石油烃污染 碳数分段 土壤污染修复 载气含氧量 石油烃浓度 |
| 收稿时间： | 2019-12-09 |
Effect of oxygen content of carrier gas and contaminant concentration on ex-situ thermal desorption efficiency of extractable petroleum hydrocarbon in soil |
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| WANG Dianer, LI Fangzhou, GAO Guolong, XU Xin, ZHANG Yaping, CHEN Chunhong, LI Guobo. Effect of oxygen content of carrier gas and contaminant concentration on ex-situ thermal desorption efficiency of extractable petroleum hydrocarbon in soil[J]. Chinese Journal of Environmental Engineering, 2020, 14(7): 1894-1902. doi: 10.12030/j.cjee.201912061 |
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| Authors: | WANG Dianer LI Fangzhou GAO Guolong XU Xin ZHANG Yaping CHEN Chunhong LI Guobo |
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| Affiliation: | 1.Everbright Environmental Remediation(Jiangsu)Limited Company, Nanjing 211100, China; 2.Key laboratory of Thermal Conversion and Control of Ministry of Education, School of Energy and Environment, Southeast University, Nanjing 210096, China |
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| Abstract: | Total petroleum hydrocarbons (TPHs) are biotoxic and difficult to degrade in soil. Ex-situ thermal desorption (ESTD) has an excellent potential for petroleum hydrocarbon contaminated soil remediation. Based on the laboratory simulated ex-situ thermal desorption device, the effects of oxygen content of carrier gas and petroleum hydrocarbon pollution concentration in thermal desorption treatment on the removal efficiencies of the five fractions of diesel range organics (DRO) and oil range organics (ORO) in extractable petroleum hydrocarbons (EPHs) were studied. The results showed that the desorption efficiency did not exceed 50% in 20 min at the initial concentration of 5 000~20 000 mg·kg−1, and the desorption efficiency could reach 68.2% at 20 min when the initial concentration increased to 40 000 mg·kg−1. The residual concentration of 40 000 mg·kg−1 contaminated soil was 407.1 mg·kg−1 at 50 min-thermal desorption treatment. The desorption efficiencies of DOR fractions at the same time increased with the increase of contaminant concentrations. The ORO components could not be desorbed entirely within 50 min, and the desorption efficiency increased first and then decreased with the increase of contaminant concentration. The removal rates of the three DRO components showed a significant growth trend with the increase of oxygen content in the atmosphere at 250 °C. The two ORO components achieved their highest removal efficiencies at 12% and 15% oxygen content at 400 °C, respectively. The experimental results can provide reference for the engineering design parameters of ESTD technology to remediate the contaminated soil with petroleum hydrocarbons at different concentrations. |
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| Keywords: | ex-situ thermal desorption petroleum hydrocarbon pollution carbon number based fraction soil pollution remediation carrier gas oxygen content petroleum hydrocarbon concentration |
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