Abstract
Shale gas-produced water (PW), the waste fluid generated during gas production, contains a large number of organic contaminants and high salinity matrix. Previous studies generally focused on the end-of-pipe treatment of the PW and ignored the early collection process. In this study, the transformation of the molecular composition and microbial community structure of the PW in the transportation and storage process (i.e., from the gas–liquid separator to the storage tank) were investigated. As the PW was transported from the gas–liquid separator to the portable storage tank, the dissolved organic matter (DOM) showed greater saturation, less oxidation, and lower polarity. DOMs with high O/C and low H/C ratios (numbers of oxygen and hydrogen divided by numbers of carbon) were eliminated, which may be due to precipitation or adsorption by the solids suspended in the PW. The values of double-bond equivalent (DBE), DBE/C (DBE divided by the number of carbon), and aromatic index (AI) decreased, likely because of the microbial degradation of aromatic compounds. The PW in the gas–liquid separator presented a lower biodiversity than that in the storage tank. The microbial community in the storage tank showed the coexistence of anaerobes and aerobes. Genera related to biocorrosion and souring were detected in the two facilities, thus indicating the necessity of more efficient anticorrosion strategies. This study helps to enhance the understanding of the environmental behavior of PW during shale gas collection and provides a scientific reference for the design and formulation of efficient transportation and storage strategies to prevent and control the environmental risk of shale gas-derived PW.
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The datasets used and/or analyzed during the current study are available from the corresponding author on reasonable request.
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This work is supported by the National Natural Science Foundation of China (NSFC) under Grant No. 41977414, the National Science and Technology Major Project of China under Grant No. 2016ZX05060-022, and the Science and Technology Planing Project of Fujian Province under Grant No. 2018J01087.
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Yufei Ji: Investigation, data curation, writing—original draft
Zhaoji Zhang: conceptualization, writing—original draft, writing—reviewing and editing investigation
Yiling Zhuang: conceptualization, methodology
Rugang Liao: investigation, conceptualization
Zejun Zhou: project administration, conceptualization
Shaohua Chen: project administration, funding acquisition
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Ji, Y., Zhang, Z., Zhuang, Y. et al. Molecular-level variation of dissolved organic matter and microbial structure of produced water during its early storage in Fuling shale gas field, China. Environ Sci Pollut Res 28, 38361–38373 (2021). https://doi.org/10.1007/s11356-021-13228-7
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DOI: https://doi.org/10.1007/s11356-021-13228-7