Long-term and efficient treatment of shale gas flowback wastewater by the novel double SEP@Fe-Mn/RGO composite membranes method

• Published in: Desalination 2024-07, Vol.580, p.117537, Article 117537
• Main Authors: Xiao, Xuehan, Yu, Zongxue, Wang, Juan, Luo, Shiyi, Huang, Yan, Han, Dingmei, Li, Junchen, Chen, Zhiquan, Wang, Jie, Huang, Minggang
• Format: Article
• Language: English
• Subjects: Fenton reaction; In-situ bubbles; Oil-water separation; Shale gas wastewater; Trade-off
• ISSN: 0011-9164; 1873-4464
• DOI: 10.1016/j.desal.2024.117537

The long-term and efficient treatment of shale gas wastewater is an inevitable tendency. This study employed the SEP@Fe-Mn/RGO composite membrane series for the membrane separation treatment of shale gas wastewater. Different proportions and different function of SEP@Fe-Mn/RGO composite membranes were obtained through the method of electrostatic self-assembly. This study researched the “Trade-off” issue of membranes separation through the analysis，resulting in membranes that best meets the separation requirements for shale gas wastewater. After two membrane separation, The oil-water separation efficiency (COD 2040 mg/L and TOC 487.14 mg/L) of shale gas wastewater was >99.3 %. The removal rate of the main salt component (Na2SO4) reached 83.56 %, and the removal rate of major heavy metal ions (Fe3+, Cr3+, Ba2+) was above 60 %. Because of the continuous generation of in-situ bubbles by the reaction of MnO2 with H2O2, and Fenton reactions on the membrane, which further accelerated the separation of pollutants. In a variety of harsh water environments, this membrane series remained stable within 12 h. Simple to prepare, cost-effective, low in energy consumption, and environmentally friendly, which makes it promising for wide applications in the field of petroleum water treatment. •Composite membranes with different functions were synthesized in a simple and economical way.•Through the experiment to established the oil-water separation model, explore the best proportion of the composite membrane to solve the "Trade-off"•After two membrane separations, all kinds of water pollution in shale gas wastewater can be effectively separated.