Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, Canada.
Department of Building, Civil and Environmental Engineering, Concordia University, Montreal, Canada.
J Hazard Mater. 2018 Sep 15;358:475-483. doi: 10.1016/j.jhazmat.2018.04.002. Epub 2018 Apr 8.
Phase separation of oil wastes can mitigate the effects on the environment, by decreasing the volume of hazardous materials and regenerate energy. This study focused on the advanced electrokinetic method as a treatment technology to treat oil sediments from oil refineries and separate them into their individual phase components. The effects of four types of electrical field on the phase separation of oil sediments from an oil refinery were investigated namely constant direct current (CDC), pulsed direct current (PDC), incremental direct current (IDC) and decremental direct current (DDC). The results showed that the extent and quality of phase separation differed based on the type of electrical current applied, and indicated that different mechanisms such as electroosmosis, electrophoresis, electro-demulsification, and electro-sedimentation might have been involved in the separation process depending on the type of electrical supply. The application of DDC and IDC was found to cause a significant separation of solids by electrophoresis with the movement of almost 70% of solids to the anode of the reactors. The DDC and IDC regimes resulted in the most efficient phase separation of the oil sediments, and even incurred a highly resolved separation of light hydrocarbons at the top anode.
油渣的相分离可以减轻对环境的影响，减少危险物质的体积并再生能源。本研究集中于先进的电动方法作为一种处理技术，以处理炼油厂的油渣并将其分离成其各个相成分。研究了四种电场对炼油厂油渣的相分离的影响，即直流恒电场（CDC）、脉冲直流电场（PDC）、直流增量电场（IDC）和直流减量电场（DDC）。结果表明，根据施加电流的类型，相分离的程度和质量不同，并且表明不同的机制，如电动渗透、电泳、电乳化和电沉积，可能已经涉及分离过程，具体取决于电源的类型。发现 DDC 和 IDC 的应用会引起固体通过电泳显著分离，几乎 70%的固体移动到反应器的阳极。DDC 和 IDC 区导致油渣的相分离最有效，甚至在顶部阳极处引起轻烃的高度分辨分离。
