Optimization and characterization of biosurfactant produced by indigenous Brevibacillus borstelensis isolated from a low permeability reservoir for application in MEOR

Hao Dong, Anying Zheng, Yanlong He, Xiaotong Wang, Yang Li, Yongan Gu, Ibrahim M Banat, Shanshan Sun, Yuehui She, Fan Zhang

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Abstract

Biosurfactants are expected to be a key factor for microbial enhanced oil recovery (MEOR). In this study, we described the novel biosurfactant-producing strain Brevibacillus borstelensis YZ-2 isolated from a low permeability oil reservoir. We purified and characterized the biosurfactants produced by this YZ-2 strain via thin-layer chromatography and MALDI-TOF-MS, revealing them to be fengycins. We additionally used a Box–Behnken design approach to optimize fermentation conditions in order to maximize the biosurfactants production. Core flooding experiments showed that biosurfactants produced by YZ-2 can significantly enhance crude oil recovery. Micro-model tests showed that emulsification and IFT reduction was the main EOR mechanism of the YZ biosurfactant in the oil wet model. In summary, these findings highlight the potential of Brevibacillus borstelensis YZ-2 and its metabolites for MEOR.
Original languageEnglish
Pages (from-to)2036-2047
Number of pages12
JournalRSC Advances
Volume12
Issue number4
DOIs
Publication statusPublished - 12 Jan 2022

Bibliographical note

Funding Information:
This investigation was nancially supported by the National Natural Science Foundation of China (51634008, 51804041), Scientic Research Program Funded by Shaanxi Provincial Education Department (Program No. 20JS119).

Publisher Copyright:
© The Royal Society of Chemistry.

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