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Title: In situ transformation of ethoxylate and glycol surfactants by shale-colonizing microorganisms during hydraulic fracturing

Journal Article · · The ISME Journal
ORCiD logo [1]; ORCiD logo [2];  [3];  [4]; ORCiD logo [4]; ORCiD logo [4];  [1]; ORCiD logo [5]; ORCiD logo [5];  [5];  [1];  [1]; ORCiD logo [5]; ORCiD logo [5];  [2];  [5];  [4];  [3]
  1. The Ohio State Univ., Columbus, OH (United States)
  2. Duke Univ., Durham, NC (United States)
  3. Univ. of New Hampshire, Durham, NH (United States)
  4. Colorado State Univ., Fort Collins, CO (United States)
  5. Pacific Northwest National Lab. (PNNL), Richland, WA (United States)

In the last decade, extensive application of hydraulic fracturing technologies to unconventional low-permeability hydrocarbon-rich formations has significantly increased natural gas production in the United States and abroad. The injection of surface-sourced fluids to generate fractures in the deep subsurface introduces microbial cells and substrates to low-permeability rock. A subset of injected organic additives has been investigated for their ability to support biological growth in shale microbial community members; however, to date, little is known on how complex xenobiotic organic compounds undergo biotransformations in this deep rock ecosystem. Here, high-resolution chemical, metagenomic, and proteomic analyses reveal that widely-used surfactants are degraded by the shale-associated taxa Halanaerobium, both in situ and under laboratory conditions. These halotolerant bacteria exhibit surfactant substrate specificities, preferring polymeric propoxylated glycols (PPGs) and longer alkyl polyethoxylates (AEOs) over polyethylene glycols (PEGs) and shorter AEOs. Enzymatic transformation occurs through repeated terminal-end polyglycol chain shortening during co-metabolic growth through the methylglyoxal bypass. Furthermore, this work provides the first evidence that shale microorganisms can transform xenobiotic surfactants in fracture fluid formulations, likely affecting the efficiency of hydrocarbon recovery, and demonstrating an important association between injected substrates and microbial growth in an engineered subsurface ecosystem.

Research Organization:
Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC05-76RL01830
OSTI ID:
1572967
Report Number(s):
PNNL-SA-141428
Journal Information:
The ISME Journal, Vol. 13, Issue 11; ISSN 1751-7362
Publisher:
Nature Publishing GroupCopyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 12 works
Citation information provided by
Web of Science

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Cited By (1)

Identification of Persistent Sulfidogenic Bacteria in Shale Gas Produced Waters conference January 2020

Figures / Tables (4)