CAS Key Laboratory of Urban Pollutants Conversion, Department of Chemistry , University of Science and Technology of China , Hefei 230026 , China.
School of Civil and Environmental Engineering and the Brook Byers Institute for Sustainable Systems , Georgia Institute of Technology , Atlanta , Georgia 30332-0595 , United States.
Environ Sci Technol. 2018 May 1;52(9):5330-5338. doi: 10.1021/acs.est.7b03899. Epub 2018 Apr 20.
Petroleum-contaminated soil (PCS) caused by the accidental release of crude oil into the environment, which occurs frequently during oil exploitation worldwide, needs efficient and cost-effective remediation. In this study, a fast pyrolysis technology was implemented to remediate the PCS and concurrently recover the oil. The remediation effect related to pyrolytic parameters, the recovery rate of oil and its possible formation pathway, and the physicochemical properties of the remediated PCS and its suitability for planting were systematically investigated. The results show that 50.9% carbon was recovered in oil, whose quality even exceeds that of crude oil. Both extractable total petroleum hydrocarbon (TPH) and water-soluble organic matter (SOM) in PCS were completely removed at 500 °C within 30 min. The remaining carbon in remediated PCS was determined to be in a stable and innocuous state, which has no adverse effect on wheat growth. On the basis of the systematically characterizations of initial PCS and pyrolytic products, a possible thermochemical mechanism was proposed which involves evaporation, cracking and polymerization. In addition, the energy consumption analysis and remediation effect of various PCSs indicate that fast pyrolysis is a viable and cost-effective method for PCS remediation.
受石油污染的土壤（PCS）是由于在全球范围内的石油开采过程中，原油意外泄漏到环境中而产生的，需要高效且具有成本效益的修复方法。在本研究中，采用快速热解技术来修复 PCS 并同时回收石油。系统地研究了热解参数与修复效果的关系、油的回收率及其可能的形成途径、修复后的 PCS 的物理化学性质及其种植适宜性。结果表明，50.9%的碳以油的形式回收，其质量甚至超过了原油。在 500°C 下，仅需 30 分钟即可完全去除 PCS 中的可萃取总石油烃（TPH）和水溶性有机物（SOM）。修复后的 PCS 中剩余的碳被确定为稳定且无毒的状态，对小麦生长没有不利影响。基于初始 PCS 和热解产物的系统表征，提出了一种可能的热化学机制，涉及蒸发、裂化和聚合。此外，对不同 PCS 的能量消耗分析和修复效果表明，快速热解是一种可行且具有成本效益的 PCS 修复方法。
