Department of Building, Civil and Environmental Engineering, Concordia University, Montreal H3G 1M8, Canada.
Department of Civil and Resource Engineering, Faculty of Engineering, Dalhousie University, Halifax B3H 4R2, Canada.
Sci Total Environ. 2024 Nov 25;953:176165. doi: 10.1016/j.scitotenv.2024.176165. Epub 2024 Sep 12.
Spilled oil in ocean can spread to the shoreline and cause long-term impacts on the shoreline's ecological environment. Therefore, removing oil accumulated on shorelines is crucial. This study proposed an innovative ovalbumin (OVA) fluid-assisted method for the cleanup of oiled shoreline substrates. The oil removal efficiency of OVA fluids was systematically investigated. Higher concentrations of OVA fluids effectively enveloped and immobilized the oil, aiding in its separation from the sand surface. The increased temperature reduced the viscosity of emulsions, facilitating improved flow and oil removal. High salinity promoted the creation of oil particle aggregates molecules and facilitated the release of oil from the sand surface. The factorial analysis demonstrated that a high salt environment significantly enhances the combined impact of temperature and pH on oil removal performance. Different methods for the responsive separation of washing effluents were studied, and the most effective separation method was adjusting the pH of effluents to 4.54 (the isoelectric point of OVA). Separated precipitates exhibited good decomposition efficiency through thermal decomposition and biodegradation. OVA fluids boast advantages, such as low cost, easy recyclability, and non-toxicity, while ensuring high oil removal efficiency and making them a promising eco-friendly technique for the cleanup of oiled shorelines.
溢油进入海洋后会扩散到海岸线，并对其生态环境造成长期影响。因此，清除岸线积累的油污至关重要。本研究提出了一种新颖的卵清蛋白（OVA）液辅助方法，用于清理被油污染的岸线基质。系统研究了 OVA 液的除油效率。较高浓度的 OVA 液能有效地包裹并固定油污，有助于其从沙表面分离。升高温度会降低乳状液的粘度，从而促进其更好地流动和除油。高盐度促进了油颗粒聚集体分子的形成，并有助于油从沙表面释放。因子分析表明，高盐环境显著增强了温度和 pH 值对除油性能的综合影响。研究了响应性洗涤废水分离的不同方法，最有效的分离方法是将废水的 pH 值调节到 4.54（OVA 的等电点）。分离出的沉淀物通过热分解和生物降解表现出良好的分解效率。OVA 液具有成本低、易于回收和无毒等优点，同时能保证高除油效率，是一种很有前途的环保型岸线油污清理技术。
