Application of waste frying oils in the biosynthesis of biodemulsifier by a
demulsifying strain Alcaligenes sp. S-XJ-1 |
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Authors: | Jia Liu Kaiming Peng Xiangfeng Huang Lijun Lu Hang Cheng Dianhai Yang Qi Zhou and Huiping Deng |
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Institution: | 1. Tongji University, Shanghai 200092, China 2. College of Environmental Science(ε)Engineering, State Key Laboratory of Pollution Control and Resource Reuse,Tongji University, Shanghai 200092, China |
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Abstract: | Exploration of biodemulsifiers has become a new research aspect. Using waste frying oils (WFOs) as carbon source to synthesize
biodemulsifiers has a potential prospect to decrease production cost and to improve the application of biodemulsifiers in the oilfield.
In this study, a demulsifying strain, Alcaligenes sp. S-XJ-1, was investigated to synthesize a biodemulsifier using waste frying oils as
carbon source. It was found that the increase of initial pH of culture medium could increase the biodemulsifier yield but decrease the
demulsification ratio compared to that using paraffin as carbon source. In addition, a biodemulsifier produced by waste frying oils and
paraffin as mixed carbon source had a lower demulsification capability compared with that produced by paraffin or waste frying oil as
sole carbon source. Fed-batch fermentation of biodemulsifier using waste frying oils as supplementary carbon source was found to be a
suitable method. Mechanism of waste frying oils utilization was studied by using tripalmitin, olein and tristearin as sole carbon sources
to synthesize biodemulsifier. The results showed saturated long-chain fatty acid was difficult for S-XJ-1 to utilize but could effectively
enhance the demulsification ability of the produced biodemulsifier. Moreover, FT-IR result showed that the demulsification capability
of biodemulsifiers was associated with the content of C=O group and nitrogen element. |
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Keywords: | waste frying oils biodemulsifier fatty acid glyceride Alcaligenes sp |
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