文献类型：期刊文献

中文题名：Granular Beds with Asymmetric Wettability Promote the Migration and Separation Behavior of Petroleum Hydrocarbon Pollutants:Migration Rate and Pressure Drop Distribution

作者：Qi Wei[1];Jinhao Bai[1];Bing Liu[1];Peng Yang[1];Zhong Zheng[1];Danhui Yang[2];Wenjie Lv[1];Hualin Wang[1,2]

机构：[1]National Engineering Research Center of Industrial Wastewater Detoxication and Resource Recovery,East China University of Science and Technology,Shanghai 200237,China;[2]Ministry of Education's Hydrogen Energy Green Manufacturing and Utilization Key Core Technology Integration Research Platform,East China University of Science and Technology,Shanghai 200237,China

年份：2025

卷号：1

期号：3

起止页码：153

中文期刊名：Water & Ecology

外文期刊名：水与生态(英文)

基金：supported by the sponsorship of the National Natural Science Foundation of China(No.52322003);Shanghai Excellent Academic/Technical Leaders Program(23XD1431900).

语种：英文

中文关键词：refinery wastewater;petroleum hydrocarbon;wettability;granular media;migration;pressure drop

摘要：Refinery wastewater contains a significant concentration of highly viscous petroleum hydrocarbon pollutants that are not only difficult to degrade but also prone to emulsification,which significantly increase the difficulty of treatment and pose a considerable risk to water ecology.Material coalescence technology provides an efficient and low-energy solu-tion for the pretreatment of refinery wastewater.However,traditional single-wettability granular beds often result in the adhesion and accumulation of the oil phase,ultimately causing instability in the device operation and an increase in effluent oil concentration.In this study,an innovative asymmetric wettability microchannel structure was proposed,uti-lizing oleophilic and oleophobic combination granular beds to enhance the rapid migration and separation of the oil phase in oil-in-water emulsions.The adhesion,migration,and separation behaviors of oil droplets within microchannels were extensively investigated through numerical simulations and high-speed camera tests.The results demonstrated that,compared to microchannel combinations with oil phase contact angles of 30°and 120°or 30°and 150°,the micro-channels with contact angles of 30°and 90°significantly improved the oil phase migration rate by 31.4%to 66.7%,while reducing the flow field pressure drop by approximately 25%.The optimal influent velocity of 0.015 m·s^(-1) was identified,which not only minimized energy consumption but also ensured the stability and continuity of the separation process.For the oil droplet cluster with a particle size of 1.4 mm,the oleophilic microchannel exhibited significant adhesion and blockage of the oil droplets.In contrast,the combined microchannel illustrated an oil droplet migration flux of 86.9%,with a bed pressure drop 45.7%lower than that of the oleophilic microchannel.The mechanism underlying these obser-vations was further analyzed using the extended Derjaguin-Landau-Verwey-Overbeek theory.The oleophilic medium enhanced the wetting and coalescence efficiency due to its low energy barrier,which favors oil phase affinity.Mean-while,the oleophobic medium increased water phase flux and reduced bed pressure drop through the formation of a water film with a high energy barrier.The asymmetric wettability design thus provides a promising strategy for the effi-cient separation of high-viscosity petroleum hydrocarbon pollutants,offering both enhanced migration efficiency and pressure drop control.