Can pre-ozonation be combined with gravity-driven membrane filtration to treat shale gas wastewater?

Peng Tang; Mengchao Shi; Xin Li; Yongli Zhang; Dong Lin; Tong Li; Weiming Zhang; Alberto Tiraferri; Baicang Liu

doi:10.1016/j.scitotenv.2021.149181

Can pre-ozonation be combined with gravity-driven membrane filtration to treat shale gas wastewater?

Sci Total Environ. 2021 Nov 25:797:149181. doi: 10.1016/j.scitotenv.2021.149181. Epub 2021 Jul 20.

Authors

Peng Tang¹, Mengchao Shi¹, Xin Li¹, Yongli Zhang², Dong Lin³, Tong Li⁴, Weiming Zhang⁵, Alberto Tiraferri⁶, Baicang Liu⁷

Affiliations

¹ Key Laboratory of Deep Earth Science and Engineering (Ministry of Education), College of Architecture and Environment, Institute of New Energy and Low-Carbon Technology, Institute for Disaster Management and Reconstruction, Sichuan University, Chengdu, Sichuan 610207, PR China; Yibin Institute of Industrial Technology, Sichuan University, Yibin Park, Section 2, Lingang Ave., Cuiping District, Yibin, Sichuan 644000, PR China.
² Key Laboratory of Deep Earth Science and Engineering (Ministry of Education), College of Architecture and Environment, Institute of New Energy and Low-Carbon Technology, Institute for Disaster Management and Reconstruction, Sichuan University, Chengdu, Sichuan 610207, PR China.
³ PetroChina Southwest Oil and Gas field Company, No.5 Fuqing Rd., Chengdu, Sichuan 610051, PR China.
⁴ School of Energy and Environmental Engineering, University of Science & Technology Beijing, Beijing, 100083, PR China. Electronic address: 1192048842@qq.com.
⁵ State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing 210023, PR China.
⁶ Department of Environment, Land and Infrastructure Engineering, Politecnico di Torino, Corso Duca degli Abruzzi 24, 10129 Turin, Italy.
⁷ Key Laboratory of Deep Earth Science and Engineering (Ministry of Education), College of Architecture and Environment, Institute of New Energy and Low-Carbon Technology, Institute for Disaster Management and Reconstruction, Sichuan University, Chengdu, Sichuan 610207, PR China; Yibin Institute of Industrial Technology, Sichuan University, Yibin Park, Section 2, Lingang Ave., Cuiping District, Yibin, Sichuan 644000, PR China. Electronic address: bcliu@scu.edu.cn.

PMID: 34311379
DOI: 10.1016/j.scitotenv.2021.149181

Abstract

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 O₃-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 O₃-GDM systems were characterized by distinct core microorganisms, which might degrade specific organics in SGW. Furthermore, O₃-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.

Keywords: Gravity-driven membrane filtration; Mechanism; Pre-ozonation; Shale gas wastewater.

MeSH terms

Filtration
Membranes, Artificial
Natural Gas
Ozone*
Wastewater
Water Purification*

Substances

Membranes, Artificial
Natural Gas
Waste Water
Ozone