期刊
SCIENCE OF THE TOTAL ENVIRONMENT
卷 797, 期 -, 页码 -出版社
ELSEVIER
DOI: 10.1016/j.scitotenv.2021.149181
关键词
Shale gas wastewater; Pre-ozunation; Gravity-driven membrane filtration; Mechanism
资金
- National Natural Science Foundation of China [52070134, 51678377]
- State Key Laboratory of Pollution Control and Resource Reuse Foundation [PCRRF20016]
- Xinglin Environment Project [2020CDYB-H02]
- Sichuan University [2019CDYB-25]
- Yibin City People's Government [2019CDYB-25]
Low-cost gravity-driven membrane (GDM) filtration combined with low dosage pre-ozonation has been shown to improve the stable flux of treatment for highly decentralized shale gas wastewater (SGW), although slightly impacting the organic content of effluent water. Pre-ozonation also influenced the microbial community structure, enhancing the performance of GDM processes in treating refractory wastewater.
Low-cost gravity-driven membrane (GDM) filtration has the potential to efficiently manage highly decentralized shale gas wastewater (SGW). In this work, the feasibility of combining low dosage pre-ozonation with the GDM process was evaluated in the treatment of SGW. The results showed that pre-ozonation significantly increased the stable flux (372%) of GDM filtration, while slightly deteriorating the quality of the effluent water in terms of organic content (-14%). These results were mainly attributed to the conversion of macromolecular organics to low-molecular weight fractions by pre-ozonation. Interestingly, pre-ozonation markedly increased the flux (198%) in the first month of operation also for a GDM process added with granular activated carbon (GGDM). Nevertheless, the flux of O-3-GGDM systems dropped sharply around the 25th day of operation, which might be due to the rapid accumulation of pollutants in the high flux stage and the formation of a dense fouling layer. Pre-ozonation remarkably influenced the microbial community structure. And O-3-GDM systems were characterized by distinct core microorganisms, which might degrade specific organics in SGW. Furthermore, O-3-GDM outperformed simple GDM as a pretreatment for RO. These findings can provide valuable references for combining oxidation technologies with the GDM process in treating refractory wastewater. (C) 2021 Published by Elsevier B.V.
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