磁分离-精细过滤-超滤-碟管式反渗透耦合工艺高效回用页岩气压裂返排液  

Magnetic separation-fine filter-ultrafiltration-disk tube-reverse osmosis coupling process to realize the efficient reuse of shale gas fracturing flowback fluid

作　　者：纪轩宇 胡敏莉 刘百仓[1] JI Xuanyu;HU Minli;LIU Baicang(College of Architecture and Environment,Sichuan University,Chengdu 610065,China)

机构地区：[1]四川大学建筑与环境学院,成都610065

出　　处：《环境工程学报》2023年第9期2928-2936,共9页Chinese Journal of Environmental Engineering

基　　金：国家自然科学基金面上项目(52070134);国家自然科学基金面上项目(52270075)。

摘　　要：页岩气压裂返排液高效处理回用是页岩气开发中亟待解决的关键问题之一。本研究在某页岩气开采平台上,构建了“磁分离-精细过滤-超滤(UF)-碟管式反渗透(DTRO)”返排液处理工艺装备,进行现场实验研究并分析污染物去除效能和机理。在优化运行条件下,磁分离-精细过滤对浊度去除率达95.5%,精细过滤出水可内部回用于复配水力压裂液;DTRO工艺对TDS、DOC、总荧光强度去除率分别达99.9%、98.7%和96.3%,出水满足《污水综合排放标准》(GB 8978-1996)和《农田灌溉水质标准》(GB 5084-2021),有望通过外排和灌溉等方式进行外部回用。此外,装备运行直接处理成本约34.90元·m^(−3)。相较其他技术,本工艺兼具高效性与经济性。因此,该工艺装备具有实现返排液高效回用的巨大应用潜力。Efficient treatment and reuse of shale gas fracturing flowback fluid is one of the key problems to be solved in shale gas development.In this study,a flowback liquid treatment device with the magnetic separationfine filter-ultrafiltration(UF)-disk tube-reverse osmosis(DTRO)coupling process was constructed on a shale gas mining platform,and field tests were conducted to study and analyze the pollutant removal efficiency and mechanism.Under the optimized operating conditions,the turbidity removal rate by magnetic separation-fine filtration process reached 95.5%,and the effluent from fine filtration could be reused internally for reconfiguring hydraulic fracturing fluid.The removal rates of TDS,DOC and total fluorescence intensity by DTRO could reach 99.9%,98.7%and 96.3%,respectively,and the DTRO effluent could meet the limits stipulated in the Integrated Wastewater Discharge Standard(GB 8978-1996)and the Standard for Irrigation Water Quality(GB 5084-2021),which is expected to be reused externally through approaches including discharge and irrigation.In addition,the direct operating cost of the device was about 34.90 yuan·m^(−3).Compared with other technologies,this process presented higher efficiency and economy.Therefore,the process device had a great application potential for highly efficient reuse of flowback fluid.

关 键 词：压裂返排液 回用 磁分离 超滤 碟管式反渗透(DTRO) 

分 类 号：X703[环境科学与工程—环境工程]