Abstract Oily water of high salinity and temperature causes challenges to eco-environment. Instead of being considered as only pollutants treated by integrated membrane system, oily water was also considered and utilized as driving-energy resource for the system in this work. This paper proposed and studied integrated UF-FO-MD system for not only treatment of oily water but also utilization of its high salinity and temperature (i.e., osmotic and thermal energies). 50 kDa ceramic membrane was selected for oily water treatment because of high oil recovery rate, low flux decline rate and great reduction of downstream FO-MD fouling, and corresponding membrane fouling mechanism was proposed. After UF, oily water was simultaneously used as FO draw (sewage as FO feed) and MD feed to utilize its osmotic and thermal energies for FO-MD running. Oil content largely influenced FO-MD fouling, while temperature and salt content had little influence. Three scenarios of dynamic mass-transfer process and temperature-salt content equilibrium curve for FO-MD were proposed, which provide guidance for oily water utilization to control mass-transfer process. UF-FO-MD system efficiently treated both oily water and sewage, and recovered high-quality water by utilization of oily water energies at low-energy cost. Oily water after treatment and utilization met reinjection standard. This work helps for oil-field wastewater treatment and utilization to realize water recovery, energy utilization and pollution reduction.

中文翻译：

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通过集成的超滤-正向渗透-膜蒸馏 (UF-FO-MD) 系统处理含油水和能源利用

摘要 高盐度、高温度的含油水给生态环境带来挑战。在这项工作中，油水不仅被视为由集成膜系统处理的污染物，还被视为并利用作为系统的驱动能源。本文提出并研究了综合 UF-FO-MD 系统，不仅可以处理含油水，还可以利用其高盐度和温度（即渗透能和热能）。由于采油率高、通量下降率低、下游FO-MD污染大大减少，选择50 kDa陶瓷膜进行含油水处理，并提出了相应的膜污染机理。超滤后，油水同时用作 FO 取料（污水作为 FO 进料）和 MD 进料，以利用其渗透能和热能进行 FO-MD 运行。油含量对 FO-MD 污垢影响很大，而温度和盐含量影响不大。提出了FO-MD动态传质过程和温度-含盐量平衡曲线的三种情景，为利用含油水控制传质过程提供指导。UF-FO-MD系统有效处理含油水和污水，以低能耗利用含油水能源回收优质水。处理利用后的油水符合回注标准。这项工作有助于油田废水处理利用，实现水回收、能源利用和污染减排。提出了FO-MD动态传质过程和温度-含盐量平衡曲线的三种情景，为利用含油水控制传质过程提供指导。UF-FO-MD系统有效处理含油水和污水，以低能耗利用含油水能源回收优质水。处理利用后的油水符合回注标准。这项工作有助于油田废水处理利用，实现水回收、能源利用和污染减排。提出了FO-MD动态传质过程和温度-含盐量平衡曲线的三种情景，为利用含油水控制传质过程提供指导。UF-FO-MD系统有效处理含油水和污水，以低能耗利用含油水能源回收优质水。处理利用后的油水符合回注标准。这项工作有助于油田废水处理利用，实现水回收、能源利用和污染减排。处理利用后的油水符合回注标准。这项工作有助于油田废水处理利用，实现水回收、能源利用和污染减排。处理利用后的油水符合回注标准。这项工作有助于油田废水处理利用，实现水回收、能源利用和污染减排。