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首页> 外文期刊>RSC Advances >Efficient remediation of crude oil-contaminated soil using a solvent/surfactant system
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Efficient remediation of crude oil-contaminated soil using a solvent/surfactant system

机译：使用溶剂/表面活性剂系统有效修复受原油污染的土壤

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Crude oil contaminated soil has been widely recognized to constitute a major environmental issue due its adverse effects on human health and ecological safety. The main objective of this study is to explore the possibility of using an ex situ solvent/surfactant washing technique for the remediation of crude oil-contaminated soil. Three organic solvents (methanol, acetone, and toluene) and one surfactant (AES-D-OA) were employed to form three kinds of solvent/surfactant systems, and utilized to evaluate the desorption performance of crude oil from soil. Natural soil, crude oil-contaminated soil, and after-remediation soil were characterized by SEM, EDX, FT-IR, and contact angle. The ability of solvent/surfactant systems to remove crude oil from soil was determined as a function of solvent polarity, mass ratio of solvent to surfactant, temperature, and ionic strength. The removal of crude oil by the toluene/AES-D-OA system was found to be more effective than the other systems. At a high toluene ratio, more than 97% of crude oil could be removed from contaminated soil. Crude oil removal efficiency was also found to increase with rising temperature or increasing ionic strength appropriately. Experimental results suggested that, compared to conventional surfactant-aided remediation, the combined utilization of surfactant and solvent achieved superior results for crude oil removal because of their similar compositions and structures in terms of aromaticity and polarity.
机译：原油污染的土壤由于其对人类健康和生态安全的不利影响而被广泛认为是一个主要的环境问题。这项研究的主要目的是探索使用非原位溶剂/表面活性剂洗涤技术修复原油污染土壤的可能性。使用三种有机溶剂（甲醇，丙酮和甲苯）和一种表面活性剂（AES-D-OA）形成三种溶剂/表面活性剂体系，并用于评估原油在土壤中的解吸性能。用SEM，EDX，FT-IR和接触角对天然土壤，原油污染土壤和修复后土壤进行了表征。确定溶剂/表面活性剂体系从土壤中去除原油的能力，取决于溶剂极性，溶剂与表面活性剂的质量比，温度和离子强度。发现通过甲苯/ AES-D-OA系统去除原油比其他系统更有效。在高甲苯比率下，可以从受污染的土壤中去除97％以上的原油。还发现原油去除效率随着温度的升高或离子强度的适当提高而增加。实验结果表明，与传统的表面活性剂辅助修复方法相比，表面活性剂和溶剂的联合利用在去除原油方面取得了优异的结果，因为它们在芳香性和极性方面具有相似的组成和结构。

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