Department of Civil and Environmental Engineering, Lehigh University, Bethlehem, PA 18015, USA.
Department of Civil and Environmental Engineering, Lehigh University, Bethlehem, PA 18015, USA; Department of Chemistry, Towson University, Towson, MD 21252, USA.
J Hazard Mater. 2016 Aug 5;313:185-92. doi: 10.1016/j.jhazmat.2016.04.005. Epub 2016 Apr 4.
Electrically assisted mitigation of coastal sediment oil pollution was simulated in floor-scale laboratory experiments using light crude oil and saline water at approximately 1/10 oil/water (O/W) mass ratio in pore fluid. The mass transport of the immiscible liquid phases was induced under constant direct current density of 2A/m(2), without water flooding. The transient pore water pressures (PWP) and the voltage differences (V) at and in between consecutive ports lined along the test specimen cell were measured over 90days. The oil phase transport occurred towards the anode half of the test specimen where the O/W volume ratio increased by 50% over its initial value within that half-length of the specimen. In contrast, the O/W ratio decreased within the cathode side half of the specimen. During this time, the PWP decreased systematically at the anode side with oil bank accumulation. PWP increased at the cathode side of the specimen, signaling increased concentration of water there as it replaced oil in the pore space. Electrically induced transport of the non-polar, non-conductive oil was accomplished in the opposing direction of flow by displacement in absence of viscous coupling of oil-water phases.
采用轻质原油和盐水，在接近 1/10 油水（O/W）质量比的孔隙流体中，在地板规模的实验室实验中模拟了电辅助减轻海岸沉积物油污。在没有水驱的情况下，在恒定的 2A/m(2) 直流密度下，诱导了不混溶液相的传质。在 90 天内，测量了沿着测试样本电池排列的连续端口处的瞬态孔隙水压力（PWP）和电压差（V）。油相朝着测试样本的阳极半区传输，在该半区长内，O/W 体积比增加了 50%，超过了其初始值。相比之下，在样本的阴极侧半区，O/W 比降低。在此期间，由于油库积聚，PWP 在阳极侧系统下降。在样本的阴极侧，PWP 增加，表明随着水在孔隙空间中取代油，水的浓度增加。通过在没有油-水相的粘性耦合的情况下，在流动的相反方向上，通过置换，实现了对非极性、非导电油的电感应传输。
