School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, PR China.
School of Mechanical and Power Engineering, East China University of Science and Technology, Shanghai, 200237, PR China; State Key Laboratory of Chemical Engineering, East China University of Science and Technology, Shanghai, 200237, PR China.
J Environ Manage. 2022 Aug 15;316:115175. doi: 10.1016/j.jenvman.2022.115175. Epub 2022 May 23.
Environmental contamination by petroleum hydrocarbons was exacerbated by oil pipeline breaks, marine oil spills and discharges from industrial production. To further improve the removal performance of petroleum hydrocarbons in solid particles, the deoiling experiments of swirl elution with micro-macrobubbles on oily sands were carried out in this paper. Experiment results indicated that when particles fell from the center of the bubble, the collision efficiency was 99.3%. The instantaneous contact angle (ICA) between the macrobubbles and the oil layer was improved in the presence of microbubbles. Furthermore, the maximum ICA of bubbles attaching to the oil layer was found to occur at pH 9 in the system of oily sand mixtures ranging from pH 5 to pH 14. This finding indicated that the slightly alkaline solution was more advantageous for bubbles to attach to the oil layer than the highly alkaline solution. The optimum condition for the elution of oily sand in the mixture of pH 7-14 was pH 12, and the oil removal efficiency was 85.4% for 10 min. The oil removal efficiency of swirl elution (SE) with bubbles on oily sand at pH 12 for 10 min was superior to either SE without bubbles or air flotation (AF). The results show that the swirl elution with bubbles can effectively enhance the oil removal efficiency of oily sands and provide guidance for controlling the environmental petroleum hydrocarbon contamination and reducing the usage of surfactants.
环境中石油烃的污染因输油管道破裂、海洋溢油和工业生产排放而加剧。为了进一步提高固体颗粒中石油烃的去除性能，本文进行了旋流洗脱微大气泡除油砂的除油实验。实验结果表明，当颗粒从气泡中心落下时，碰撞效率为 99.3%。在微气泡的存在下，大气泡与油层之间的瞬时接触角（ICA）得到提高。此外，在油砂混合物的 pH 值范围为 5 至 14 的体系中，发现气泡附着在油层上的最大 ICA 出现在 pH 值为 9 时。这表明，与强碱性溶液相比，微碱性溶液更有利于气泡附着在油层上。在 pH 值为 7-14 的混合物中洗脱油砂的最佳条件为 pH 值 12，10 分钟的除油率为 85.4%。在 pH 值为 12 的条件下，10 分钟的气泡旋流洗脱（SE）对油砂的除油效率优于无气泡 SE 或气浮（AF）。结果表明，气泡旋流洗脱可以有效提高油砂的除油效率，为控制环境中石油烃污染和减少表面活性剂的使用提供了指导。
