Journal
ENVIRONMENTAL TECHNOLOGY & INNOVATION
Volume 19, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.eti.2020.100889
Keywords
Hydraulic fracturing flowback wastewater; Hydrophobic organic pollutant; Biosurfactant; Surfactant-facilitated bioremediation; Sub-CMC dose
Funding
- National Natural Science Foundation of China [51978189]
- XinJiang Keli New Technology Development Co., Ltd, China [K18-529102-014, K17-529102-004]
- Research Funds of the Guangxi Key Laboratory of Theory and Technology for Environmental Pollution Control, China [1801K011]
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This work investigated the effects of biosurfactant at varied dose on the bioremediation of hydraulic fracturing flowback wastewater (HFFW) and explored the associated mechanism. Initially, a biosurfactant-producing strain Pseudomonas sp. CH1 was isolated from oily sludge. The glycolipid biosurfactant produced by CH1 have a critical micelle concentration (CMC) of 80 mg/L, and showed high stability over a wide range of temperature (0-120.C), pH (4-12), and salinity (0%-16%, w/v). Addition of sub-CMC dose of biosurfactant to HFFW greatly enhanced the microbial growth and activity, upregulated the expression levels of degradation-related genes, and effectively promoted the biodegradation of n-alkanes (reduction from 272.21 to 56.93 mg/L) and PAHs (reduction from 61.6 to 16.36 -g/L) in 7 days. The results suggested the feasibility of applying biosurfactant with sub-CMC dose to remediate HFFW and contribute significantly to the optimization of surfactant-facilitated bioremediation strategies. (c) 2020 Elsevier B.V. All rights reserved.
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