An integrated oil-water separation apparatus to separate free, dispersed and emulsified oil contaminations from oil-water mixture

一种集成的油水分离装置，用于从油水混合物中分离游离的、分散的和乳化的油污染物

• 批准号: RTI-2020-00503
• 负责人: Zendehboudi, Sohrab
• 金额: $ 10.93万
• 依托单位: Memorial University of Newfoundland
• 依托单位国家: 加拿大
• 项目类别: Research Tools and Instruments
• 财政年份: 2019
• 资助国家: 加拿大
• 起止时间: 2019-01-01 至 2020-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=693721
• 关键词: integrated; oil; water; separation; apparatus

Separating dilute oil contaminations from wastewater is a practical problem in various industries such as food, metal processing, and petroleum industries. The presence of low concentration oil in wastewater challenges the efficiency of conventional separation methods, especially when the oil is viscous, dispersed, and has a density similar to water. We propose to fabricate a customized and integrated system for oil-water separation, using advanced and engineered materials. Unlike alternative systems, our proposed equipment can separate all forms of oil contaminations, including free oil, dispersed oil, and emulsified oil. Using superhydrophobic and superoleophilic membranes, in the first step of separation, the free oil and large oil droplets are passively separated from the water. In this stage, superhydrophobic and superoleophilic membranes capture free and dispersed oil contaminations. Our proposed membranes are less prone to fouling as the solid particles are usually in the water phase that do not wet our hydrophobic membranes. In the second stage, functionalized stainless steel brushes that are operated under a slight vacuum condition will separate the oil droplets when they are in contact with the high capillary pressure areas between the wires. There is a possibility of having micro- and nano-emulsified oil contaminations left in the aqueous phase that is not separated in the previous two stages. We will use functionalized magnetic nanoparticles to encapsulate the nano-sized oil droplets to be separated upon applying a magnetic field. The emulsions are usually separated through energy-intensive processes such as ultrafiltration, dissolved air floatation, and coagulation. Our proposed method of using the magnetic nanoparticles is a passive separation method that uses a magnetic field supplied by permanent magnets, having a minimum energy demand. The magnetic field increases the driving force in separating the emulsified oil droplets. This can be of great interest to the Canadian heavy oil and bitumen, where the density of the oil can be similar to that of the water phase, leading to a significant delay in the separation process. The equipment can be customized to tolerate the harsh fluid characteristics of the Canadian hydrocarbons, such as heavy crude oil, high asphaltene, and resin contents, by choosing wetted materials that resist harsh chemicals. The proposed oil-water separation system will enable research studies in areas such as flow hydrodynamics of dispersed oil-water flow and flow assurance strategies related to emulsions, wax, hydrate, and asphaltene precipitation/deposition and removal. Also, the proposed experimental set up will have a great impact on the separation of oily wastewater and oil spill removal at low energy input. Additionally, the proposed system will enable training HQPs, including undergraduate and graduate students in the areas of chemical engineering, environmental engineering, and mechanical engineering.********

从废水中分离稀油污染物是各种工业如食品、金属加工和石油工业中的实际问题。废水中低浓度油的存在对常规分离方法的效率提出了挑战，特别是当油是粘性的、分散的并且具有与水相似的密度时。我们建议使用先进的工程材料制造一个定制的综合油水分离系统。与其他系统不同，我们建议的设备可以分离所有形式的油污染物，包括游离油，分散油和乳化油。使用超疏水和超亲油膜，在分离的第一步中，游离油和大油滴从水中被动分离。在这个阶段，超疏水和超亲油膜捕获游离和分散的油污染物。我们提出的膜不易结垢，因为固体颗粒通常在水相中，不会润湿我们的疏水膜。在第二阶段，在轻微真空条件下操作的功能化不锈钢刷将在油滴与导线之间的高毛细管压力区域接触时分离油滴。存在使微乳化油污染物和纳米乳化油污染物留在水相中的可能性，所述水相中的微乳化油污染物和纳米乳化油污染物在前两个阶段中未分离。我们将使用功能化的磁性纳米颗粒来封装纳米尺寸的油滴，以在施加磁场时进行分离。乳状液通常通过能量密集型工艺分离，如超滤、溶气浮选和凝聚。我们提出的使用磁性纳米颗粒的方法是一种被动分离方法，该方法使用由永磁体提供的磁场，具有最小的能量需求。磁场增加了分离乳化油滴的驱动力。这可能对加拿大重油和沥青有很大的意义，其中油的密度可能与水相的密度相似，导致分离过程的显著延迟。通过选择耐苛刻化学品的润湿材料，该设备可以定制以耐受加拿大烃类的苛刻流体特性，例如重质原油、高沥青质和树脂含量。拟议的油水分离系统将使分散的油水流动的流动流体动力学和与乳状液、蜡、水合物和沥青质沉淀/沉积和去除有关的流动保证战略等领域的研究成为可能。此外，建议的实验设置将有很大的影响，在低能量输入的含油废水的分离和溢油去除。此外，拟议的系统将能够培训HQP，包括化学工程，环境工程和机械工程领域的本科生和研究生。